阅读说明：本技术 一种环保型多功能薄层材料及制备和施工方法 (Environment-friendly multifunctional thin-layer material and preparation and construction method thereof ) 是由 董月振 邱建波 李迎民 石红星 刘刚 武彦龙 郭广生 蔡轩 秦家禄 闫伟 潘新涛 于 2020-06-19 设计创作，主要内容包括：本发明提供了一种环保型多功能薄层材料及制备和施工方法,涉及公路和市政工程技术领域,能够采用废弃橡胶制备薄层材料,降低成本提高路用性能,且有效减小橡胶沥青的高黏度并提高其存储稳定性；该材料包括：68～72质量份的粗集料、22～26质量份的细集料、1.6～2.4质量份的填料、4～6质量份的胶粉改性沥青以及0.7～1质量份的改性乳化沥青；胶粉改性沥青的组成包括：橡胶粉18～30质量份、改性剂1～3质量份和基质沥青100质量份；胶粉改性沥青的180℃布氏粘度为1～3Pa.s,60℃动力粘度大于75000Pa.s。本发明提供的技术方案适用于路面铺筑的过程中。(The invention provides an environment-friendly multifunctional thin-layer material and a preparation and construction method thereof, which relate to the technical field of highway and municipal engineering, can adopt waste rubber to prepare the thin-layer material, reduce the cost, improve the road performance, effectively reduce the high viscosity of rubber asphalt and improve the storage stability of the rubber asphalt; the material comprises: 68-72 parts by mass of coarse aggregate, 22-26 parts by mass of fine aggregate, 1.6-2.4 parts by mass of filler, 4-6 parts by mass of rubber powder modified asphalt and 0.7-1 part by mass of modified emulsified asphalt; the rubber powder modified asphalt comprises the following components: 18-30 parts of rubber powder, 1-3 parts of modifier and 100 parts of matrix asphalt; the brookfield viscosity of the rubber powder modified asphalt at 180 ℃ is 1-3 Pa.s, and the dynamic viscosity at 60 ℃ is greater than 75000 Pa.s. The technical scheme provided by the invention is suitable for the pavement paving process.)

1. An environmentally friendly multifunctional sheet material, comprising: 68-72 parts by mass of coarse aggregate, 22-26 parts by mass of fine aggregate, 1.6-2.4 parts by mass of filler, 4-6 parts by mass of rubber powder modified asphalt and 0.7-1 part by mass of modified emulsified asphalt.

2. The environment-friendly multifunctional sheet material according to claim 1, wherein the dynamic viscosity at 60 ℃ of the crumb rubber modified asphalt is greater than 75000 Pa.s.

3. The environment-friendly multifunctional thin-layer material as claimed in claim 1, wherein the composition of the crumb rubber modified asphalt comprises: 18-30 parts of rubber powder, 1-3 parts of modifier and 100 parts of matrix asphalt.

4. The eco-friendly multifunctional sheet material according to claim 3, wherein the modifier is a polyolefin compound grafted with various functional groups.

5. The environment-friendly multifunctional thin-layer material as claimed in claim 1, wherein the brookfield viscosity at 180 ℃ of the crumb rubber modified asphalt is 1-3 pa.s.

6. The environment-friendly multifunctional thin-layer material as claimed in claim 3, wherein the preparation process of the rubber powder modified asphalt comprises the following steps:

adding rubber powder and a modifier into matrix asphalt according to a proportion at 180-220 ℃, heating and stirring to swell and desulfurize rubber powder, so that rubber powder particles are connected through a gel film to form a semisolid continuous phase system with higher viscosity;

then, rubber molecules are reduced and uniformly dispersed in the asphalt through the shearing action;

and adding a preset amount of modifier again to crosslink the rubber micromolecules and the asphalt, so that the S-S bond and the S-C bond are crosslinked into a space network structure again, and the mechanical property of the rubber is reflected again.

7. The environmentally friendly multifunctional sheet material of claim 1, wherein the multifunctional sheet material has a dynamic stability of not less than 6000 times/min and a freeze-thaw split strength of not less than 80%.

8. The environment-friendly multifunctional sheet material according to claim 1, wherein the coarse aggregate is crushed stone having a particle size of 5-10 mm; the fine aggregate is stone chips with the particle size of less than 3 mm; the filler is mineral powder or cement.

9. A method for preparing an environmentally friendly multifunctional sheet material, wherein the method is used for preparing the environmentally friendly multifunctional sheet material of any one of claims 1 to 8;

the preparation method comprises the following steps: heating the coarse aggregate, the fine aggregate and the filler to 175-190 ℃, uniformly mixing and stirring for 8-10 seconds in proportion, adding the rubber powder modified asphalt with the temperature of 170-180 ℃, and stirring for 35-40 seconds to obtain the environment-friendly multifunctional thin layer material with the temperature of 170-180 ℃.

10. An environment-friendly multifunctional thin layer construction method, which is characterized in that the construction method is suitable for the construction of the environment-friendly multifunctional thin layer material as claimed in any one of claims 1 to 8;

the construction method selects a paving process according to the asphalt type of the bonding layer, a synchronous paving process is adopted when the bonding layer is modified emulsified asphalt, and a step-by-step paving process is adopted when the bonding layer is non-stick wheel emulsified asphalt;

the content of the synchronous paving process comprises the following steps: spraying the modified emulsified asphalt at the temperature of 60-85 ℃ to form a bonding layer, wherein the spraying amount is 0.7-1.0L/m²(ii) a The paving temperature of the environment-friendly multifunctional thin-layer material is 160-180 ℃, the paving speed is 12-36 m/min, and the paving thickness is 1.0-2.0 cm;

the step paving process comprises the following steps: firstly, uniformly spraying the wheel-sticking-free emulsified asphalt on a lower surface layer by using a spraying vehicle to form a bonding layer, wherein the spraying amount is 0.7-1.0L/m²(ii) a And after the bonding layer is demulsified and dried, paving the environment-friendly multifunctional thin-layer material at the temperature of 160-180 ℃ to the thickness of 1.0-2.0 cm.

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of highway and municipal engineering, in particular to an environment-friendly multifunctional thin-layer material and a preparation and construction method thereof.

[ background of the invention ]

With the rapid development of the automobile industry in China and the continuous improvement of the living standard of people, the quantity of automobiles kept in China is rapidly increased, so that a large amount of waste tires can be generated every year. According to incomplete statistics, in 2013, the yield of Chinese waste tires reaches 2.99 hundred million, 70 percent of the waste tires are not recycled, and the recycling rate is 30 to 40 percent lower than that of developed countries. In terms of engineering, the production of rubber powder modified asphalt by grinding waste tires into rubber powder is one of the main approaches for waste tire treatment.

The application of the waste tires ground into rubber powder in road engineering construction is widely concerned, compared with high polymer modified asphalt mixture represented by SBS and fibrous material stable mixture represented by SMA mixture, the rubber asphalt mixture has similar effect and low cost, and the rubber asphalt produced per ton can be saved by more than 1000 yuan compared with SBS modified asphalt. Meanwhile, the rubber powder containing the additive has potential benefits on improving the bonding performance of the mixture.

In addition, the comprehensive performance of the rubber asphalt is superior to that of the prior SBS modified asphalt, and the rubber asphalt has better high-temperature performance, better fatigue performance, longer durability and excellent low-temperature performance; finally, the rubber asphalt has good leakage resistance, which is reflected in that the leakage problem can not occur even if the asphalt dosage of the rubber asphalt in the mixture is up to more than 8 percent and no mineral powder is added, so that asphalt fiber is not needed when the rubber asphalt is used for the SMA asphalt mixture, and the mineral powder with high dosage is not needed to be added to adsorb the asphalt, thereby reducing the cost of the asphalt mixture; the rubber asphalt has low cost, so that the cost of the asphalt mixture can be further reduced; however, the rubber asphalt has high processing temperature, high viscosity, poor storage stability, high temperature sensitivity and poor construction workability, which are one of the problems troubling the road users in China. At present, the market has a part of ultrathin wearing layer pavements using rubber asphalt, which solves the defects of a part of rubber asphalt, but the defects are slightly overcome, especially the problems of high viscosity and storage stability are not well solved, and the ultrathin wearing layer pavements cannot be popularized and applied in a large area.

Accordingly, there is a need to develop an environmentally friendly multifunctional sheet material and methods of preparation and construction that address the deficiencies of the prior art to solve or mitigate one or more of the problems set forth above.

[ summary of the invention ]

In view of the above, the invention provides an environment-friendly multifunctional thin-layer material and a preparation and construction method thereof, which can adopt waste rubber to prepare the thin-layer material, reduce the cost, improve the road performance, effectively reduce the high viscosity of rubber asphalt and improve the storage stability of the rubber asphalt.

In one aspect, the present invention provides an environment-friendly multifunctional sheet material, wherein the multifunctional sheet material comprises: 68-72 parts by mass of coarse aggregate, 22-26 parts by mass of fine aggregate, 1.6-2.4 parts by mass of filler, 4-6 parts by mass of rubber powder modified asphalt and 0.7-1 part by mass of modified emulsified asphalt.

The above aspects and any possible implementations further provide an implementation where the crumb modified asphalt has a dynamic viscosity at 60 ℃ of greater than 75000 pa.s.

The above aspects and any possible implementations further provide an implementation, where the composition of the crumb rubber modified asphalt comprises: 18-30 parts of rubber powder, 1-3 parts of modifier and 100 parts of matrix asphalt.

The above aspects and any possible implementations further provide an implementation in which the modifier is a polyolefin compound grafted with a plurality of functional groups.

The above aspects and any possible implementation manner further provide an implementation manner that the brookfield viscosity at 180 ℃ of the crumb rubber modified asphalt is 1-3 pa.s.

The above aspects and any possible implementation manners further provide an implementation manner, and the preparation process of the crumb rubber modified asphalt comprises the following steps:

adding rubber powder and a modifier into matrix asphalt according to a proportion at 180-220 ℃, heating and stirring to swell and desulfurize rubber powder, so that rubber powder particles are connected through a gel film to form a semisolid continuous phase system with higher viscosity;

then, rubber molecules are reduced and uniformly dispersed in the asphalt through the shearing action;

and adding a preset amount of modifier again to crosslink the rubber micromolecules and the asphalt, so that the S-S bond and the S-C bond are crosslinked into a space network structure again, and the mechanical property of the rubber is reflected again.

The aspect and any possible implementation manner described above further provide an implementation manner that the multifunctional thin-layer material has a dynamic stability of not less than 6000 times/min and a freeze-thaw splitting strength of not less than 80%; the dynamic stability required by general specifications in the industry is not less than 4000 times/min, and the freeze-thaw splitting strength is not less than 75%.

The above aspect and any possible implementation further provides an implementation, wherein the coarse aggregate is crushed stone with a particle size of 5-10 mm; the fine aggregate is stone chips with the particle size of less than 3 mm; the filler is mineral powder or cement.

In another aspect, the present invention provides a method for preparing an environmentally friendly multifunctional sheet material, wherein the method is used for preparing the environmentally friendly multifunctional sheet material as described above;

the preparation method comprises the following steps: heating the coarse aggregate, the fine aggregate and the filler to 175-190 ℃, uniformly mixing and stirring for 8-10 seconds in proportion, adding the rubber powder modified asphalt with the temperature of 170-180 ℃, and stirring for 35-40 seconds to obtain the environment-friendly multifunctional thin layer material with the temperature of 170-180 ℃.

In another aspect, the present invention provides an environmentally friendly multifunctional thin layer construction method, wherein the construction method is suitable for construction of any one of the environmentally friendly multifunctional thin layer materials described above;

the construction method selects a paving process according to the asphalt type of the bonding layer, a synchronous paving process is adopted when the bonding layer is modified emulsified asphalt, and a step-by-step paving process is adopted when the bonding layer is non-stick wheel emulsified asphalt;

the content of the synchronous paving process comprises the following steps: spraying the modified emulsified asphalt at the temperature of 60-85 ℃ to form a bonding layer, wherein the spraying amount is 0.7-1.0L/m²(ii) a The paving temperature of the environment-friendly multifunctional thin-layer material is 160-180 ℃, the paving speed is 12-36 m/min, and the paving thickness is 1.0-2.0 cm;

the step paving process comprises the following steps: firstly, uniformly spraying the wheel-sticking-free emulsified asphalt on a lower surface layer by using a spraying vehicle to form a bonding layer, wherein the spraying amount is 0.7-1.0L/m²(ii) a After the adhesive layer is demulsified and dried, carrying out cyclizationPaving the shape-keeping multifunctional thin layer material, wherein the paving temperature is 160-180 ℃, and the paving thickness is 1.0-2.0 cm.

Compared with the prior art, the invention can obtain the following technical effects: the rubber asphalt is modified by the high-performance modifier, so that the high-temperature viscosity of the rubber asphalt is reduced, the processing temperature is reduced, the storage stability is improved, and the rubber asphalt has better ageing resistance; the performance meets the asphalt requirement of a thin wearing layer, the optimal asphalt content can be controlled within 6 percent, and then the multifunctional thin aggregate grading is optimized and adjusted to form the environment-friendly multifunctional thin material using the high-performance rubber modified asphalt, so that the engineering cost is further reduced, the better pavement performance is ensured, and the advantages of skid resistance, water mist resistance, noise reduction, good durability and the like are achieved.

Of course, it is not necessary for any one product in which the invention is practiced to achieve all of the above-described technical effects simultaneously.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of an environment-friendly multifunctional sheet material according to an embodiment of the present invention;

fig. 2 is a diagram illustrating a ratio of rubber powder modified asphalt according to an embodiment of the present invention.

[ detailed description ] embodiments

For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.

It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

Aiming at the defects of the prior art, the rubber asphalt is modified by the high-performance modifier, so that the high-temperature viscosity of the rubber asphalt is reduced, the processing temperature is reduced, the storage stability is improved, and the rubber asphalt has better ageing resistance. The performance of the asphalt meets the asphalt requirement of a thin wearing layer, and the optimal asphalt content can be controlled within 6 percent. And then, the multifunctional thin-layer aggregate grading is optimized and adjusted to form the environment-friendly multifunctional thin-layer material using the high-performance rubber modified asphalt, so that the construction cost is further reduced, the excellent pavement performance is ensured, and the environment-friendly multifunctional thin-layer material has the advantages of skid resistance, water mist resistance, noise reduction, good durability and the like.

As shown in fig. 1, the environment-friendly multifunctional thin-layer material comprises the following raw materials in parts by weight:

crushed stone with the particle size of 5-10 mm: 68-72 parts;

stone chips with a particle size of less than 3 mm: 22-26 parts;

mineral powder or cement: 1.6-2.4 parts;

high-performance rubber powder modified asphalt: 4-6 parts;

SBS modified emulsified asphalt: 0.7-1 part.

The crushed stone with the grain diameter of 5-10mm is used as coarse aggregate and is made of hard rocks such as basalt, diabase, andesite, amphibole, metamorphic granite and the like. Specific indices are shown in table 1.

TABLE 1 coarse aggregate Performance index

Test items	Test method	Unit of	Require that
				Los Angeles abrasion loss	T 0317–2005	％	23max
Elongated flat particle content 3: 1	T 0312–2005	％	10max
				Single crushing surface	T 0346–2000	％	100min
Two or more crushing surfaces	T 0346–2000	％	90min
				Adhesion to asphalt	T 0616–1993	-	＞5

The stone chips with the grain diameter of less than 3mm are used as fine aggregates. The specific index is shown in Table 2.

TABLE 2 Fine aggregate Performance index

Test items	Test method	Unit of	Require that
				Sand equivalent	T 0334–2005	％	60min
Corner test of fine aggregate	T 0344–2000	％	30min

The filler is preferably mineral powder obtained by milling hydrophobic stones such as limestone and the like, the mineral powder is required to be dry and clean, and the grading must meet the requirements of table 3.

TABLE 3 Filler grading requirements

Mesh size (mm)	Passage Rate (%)
		0.6	100
0.075	>75

The raw materials of the high-performance rubber powder (namely rubber powder) modified asphalt comprise rubber powder, a high-performance modifier and matrix asphalt. As shown in fig. 2, the mass ratio of the rubber powder, the high-performance modifier and the matrix asphalt is as follows: (18 to 30): 1 to 3): 100. The rubber powder is rubber powder and is mainly prepared by finely grinding waste tires. The high-efficiency modifier is a polyolefin compound grafted with a plurality of functional groups, and can react with the rubber asphalt chemically to improve the performance of the rubber asphalt remarkably after being added with a specific proportion and treated by a certain process (the process comprises the processes of stirring, desulfurization, crosslinking and the like), but does not have any negative effect on the viscosity system of the rubber asphalt. The specific ratio may be a mass ratio of the above rubber powder, the high-performance modifier and the base asphalt.

The preparation process of the high-performance rubber powder modified asphalt comprises the following steps: adding 30-mesh rubber powder and part of modifier into matrix asphalt at 180-220 ℃, heating and stirring to swell and desulfurize the rubber powder, and fully swelling the 30-mesh rubber powder and the light oil in the matrix asphalt to increase the volume so that rubber powder particles are connected through a gel film to form a semisolid continuous phase system with higher viscosity. The rubber molecules are then made small and uniformly dispersed in the asphalt by high-intensity shearing action. And adding the modifier again to crosslink the rubber micromolecules and the asphalt, so that the S-S bond and the S-C bond are crosslinked into a spatial network structure again, and the mechanical properties of the rubber, such as flexibility, elasticity and the like, are reflected again. The performance indexes of the high-performance rubber powder modified asphalt are shown in Table 4.

Compared with the common rubber modified asphalt, the high-performance rubber powder modified asphalt has the following advantages:

(1) the storage performance is better, the segregation is reduced, and the product can be transported for a long distance and stored for a long time;

(2) the processing temperature is reduced, the processing temperature of the traditional rubber asphalt needs to be over 180 ℃, the processing temperature of the high-performance rubber powder modified asphalt is 170-180 ℃, the processing temperature is low, and the rubber powder modified asphalt is practical and more convenient;

(3) the high-temperature viscosity is reduced, the Brookfield viscosity at 180 ℃ of the traditional rubber asphalt is more than 3Pa.s, the Brookfield viscosity at 180 ℃ of the high-performance rubber powder modified asphalt is 1-3 Pa.s, the high-temperature viscosity can be effectively reduced, and the high-temperature rubber powder modified asphalt has better construction convenience and easiness;

(4) the consumption of asphalt in the mixture is smaller, the consumption of the high-performance rubber powder modified asphalt is generally 4.5 to 5.5 percent, and the consumption of the traditional rubber modified asphalt is generally more than 6 percent;

(5) the internal cohesive force of the material can be improved, the overall strength of the mixture is improved, and the dynamic viscosity at 60 ℃ is more than 75000 Pa.s.

TABLE 4 high Performance crumb rubber modified asphalt Performance index

The modified emulsified asphalt can be used as a raw material for a thin layer material and also can be used as a raw material for a bonding layer. Due to the characteristics of extreme thin and broken or open gradation of the environment-friendly multifunctional thin layer, the modified emulsified asphalt bonding layer is required to have better bonding performance and water resistance, and in addition, the modified emulsified asphalt bonding layer needs to realize quick emulsion breaking to realize quick open traffic and meet the construction performance of mechanical spraying, and a special formula is required to realize corresponding characteristics. Meanwhile, the asphalt is divided into high-strength modified emulsified asphalt and non-stick wheel modified emulsified asphalt according to different construction processes, and the high-strength modified emulsified asphalt and the non-stick wheel modified emulsified asphalt are respectively applied to synchronous paving and step-by-step paving processes.

The high-strength modified emulsified asphalt bond coat and the tack-free wheel modified emulsified asphalt must satisfy the requirements of tables 5 and 6.

TABLE 5 high-strength modified emulsified asphalt Performance index

TABLE 6 non-stick wheel modified emulsified asphalt Performance index

The process for mixing the environment-friendly multifunctional thin-layer asphalt mixture comprises the following steps:

the asphalt mixture used for the environment-friendly multifunctional thin layer can be stirred by any type of asphalt stirring equipment, the crushed stone with the particle size of 5-10mm and the stone chips with the particle size of less than 3mm are heated to 175-190 ℃, the high-performance rubber powder modified asphalt is heated to 170-180 ℃, 68-72 parts of the crushed stone with the particle size of 5-10mm, 22-26 parts of the stone chips with the particle size of less than 3mm and 1.6-2.4 parts of mineral powder or cement are conveyed into a stirring cylinder of the asphalt stirring equipment to be stirred for 8-10 seconds, then 4-6 parts of the high-performance rubber powder modified asphalt is added to be stirred for 35-40 seconds, and the environment-friendly multifunctional thin layer mixture can be prepared, wherein the temperature of the asphalt mixture is 170.

The environment-friendly multifunctional thin layer adopts the open grading or the cut-off grading matched with the construction process, so that the coarse material can be well bonded with the polymer modified emulsified asphalt, and meanwhile, the coarse framework shape keeps good functions of skid resistance, noise reduction and water drainage. Wherein the batch composition requirements are shown in table 7.

TABLE 7 mixture grading requirements

The test method of the asphalt mixture is according to the technical Specification for constructing the asphalt pavement of the highway in China, and the indexes of the concrete mixture are shown in tables 8-10.

TABLE 8 bulk property requirements for blends

Item	Require that
		Porosity Va (%), Min	10
Mineral aggregate void ratio VMA (%), Min	21
		The asphalt gap filling rate VFA (%),	30-60

TABLE 9 asphalt dosage requirement of the mixture

Item	Require that
		Oil film thickness (. mu.m), Min	9
Powder-to-gel ratio (%), Max	1.4

TABLE 10 blend Performance requirements

Item	Require that
		Dynamic stability (Min), Min	6000
Freeze-thaw cleavage strength TSR (%), Min	80
		Leak (%) and Max	0.1

The environment-friendly multifunctional thin layer is formed by paving the mixture, is an environment-friendly asphalt multifunctional thin layer material which is 1-2 cm thick and adopts high-performance rubber modified asphalt, reduces the consumption of matrix asphalt materials, saves energy, protects the environment and reduces the manufacturing cost; the environment-friendly multifunctional thin layer has better pavement performance, has the advantages of skid resistance, water mist resistance, noise reduction, good durability and the like, and particularly has better aging resistance by adding the waste rubber powder material; by adopting the on-off grading design, the large porosity and the pore volume of more than 80 percent can give consideration to the drainage function of the pavement and simultaneously increase the durability of the pavement; besides the paving process of the synchronous paver, the stepwise paving process of common asphalt concrete can be carried out by using the high-performance non-stick wheel emulsified asphalt, so that the requirements on construction machinery, particularly the paver are reduced, and the construction convenience and easiness are better. The method is suitable for being applied to the surface layer of a newly-built asphalt road, the surface layer of a bridge tunnel, the additional pavement on a bridge cement surface layer, the additional pavement on a cement road surface layer and the additional pavement on the cement road surface layer, and is also suitable for the surface layer additional pavement of a preventive maintenance project of an old road surface.

Paving an environment-friendly multifunctional thin-layer asphalt mixture: the temperature of the site is not lower than 10 ℃, and the construction in the rain can not be carried out. The paving process is divided into a synchronous paving process and a step-by-step paving process according to different emulsified asphalt.

(1) Synchronous paving

When a high-strength emulsified asphalt adhesive layer is adopted (the high-strength emulsified asphalt refers to emulsified asphalt with the solid content of more than 65 percent, and the solid content of common emulsified asphalt is 40 to 50 percent), the environment-friendly multifunctional thin layer needs to be paved by adopting special synchronous paving equipment, and the environment-friendly multifunctional thin layer comprises a receiving hopper, a conveying belt, an emulsified asphalt storage tank, an emulsified asphalt spraying and metering system, a vibration with adjustable width, a vibrating ironing plate and the like. The equipment can complete the spraying of the high-strength modified emulsified asphalt and the paving and ironing of the hot asphalt mixture at one time. Before the hot asphalt mixture is spread, the crawler belt or other parts of the spreading machine cannot contact the polymer modified emulsified asphalt sprayed on the pavement. The spreading width of the spreading machine is adjustable, so that an ideal road surface effect is achieved. The high-strength emulsified asphalt is adopted, so that the bonding and water loss resistance is greatly improved, and the high-strength emulsified asphalt has the characteristics of quick construction, traffic opening, surface function improvement, energy conservation, environmental protection and the like.

In the paving construction process of the asphalt mixture, the modified emulsified asphalt is sprayed at the temperature of 60-85 ℃, and the spraying amount must be accurately measured so as to ensure that the pavement is uniformly paved. The ideal spraying amount is about 0.7-1.0L/m². Meanwhile, aiming at specific projects, a field engineer calculates the spraying amount and adjusts the spraying amount on the field according to specific road conditions. The paving temperature of the asphalt mixture is about 160 ℃, the asphalt mixture is paved after the modified emulsified asphalt is sprayed, the hot asphalt mixture is paved on all the sprayed surfaces of the modified emulsified asphalt, and the hot asphalt mixture is ironed by an electrically heated vibration ironing plate. The multifunctional thin layer paving needs to determine the paving width and thickness in advance so as to facilitate the engineering quantity statistics.

The asphalt mixture is transported to a construction site by a vehicle, a special synchronous asphalt paver is adopted to pave the asphalt mixture on a road surface, the asphalt paver firstly sprays a layer of modified emulsified asphalt on a lower bearing layer of the road surface through a spraying system in the process of paving the asphalt mixture, and then the asphalt mixture is uniformly paved on the road through a spiral distributor thereof, at the moment, the polymer modified emulsified asphalt forms foam under the action of the heat energy of the asphalt mixture, rises to wrap around stone materials at the lower part of the asphalt mixture, and starts demulsification and solidification; thereby realizing the high-efficient bonding of the asphalt mixture and the lower bearing layer. The paving speed is controlled to be 12-36 m/min, and the paving thickness of the asphalt mixture is 1.0-2.0 cm (determined by specific road conditions and design drawings).

(2) Step-by-step paving

On the premise of using the non-stick wheel emulsified asphalt, the traditional step paving process can be adopted to pave the environment-friendly multifunctional thin layer.

The asphalt mixing machine is generally used, and comprises a receiving hopper, a vibration part with adjustable width of a conveyor belt, a vibrating ironing plate and the like, and does not comprise an emulsified asphalt storage tank and an emulsified asphalt spraying and metering system. Firstly, uniformly spraying the non-sticky wheel emulsified asphalt on the lower surface layer by using an emulsified asphalt spraying vehicle, wherein the ideal spraying amount is about 0.7-1.0L/m². Meanwhile, aiming at specific projects, a field engineer calculates the spraying amount and adjusts the spraying amount on the field according to specific road conditions. After 2 hours, the non-sticky wheel emulsified asphalt is completely dried, and after the emulsified asphalt on a construction vehicle is removed and is not sticky or peeled, the asphalt mixture can be paved, the paving temperature of the asphalt mixture is about 160 ℃, the hot asphalt mixture is paved on all the spraying surfaces of the modified emulsified asphalt, and the hot asphalt mixture is ironed by an electrically heated vibration ironing plate. The modified emulsified asphalt forms foam under the action of the heat energy of the asphalt mixture, rises to be wrapped on the lower part of the asphalt mixture, and starts to be demulsified and solidified quickly. The multifunctional thin layer paving needs to determine the paving width and thickness in advance so as to facilitate the engineering quantity statistics, and the paving thickness of the asphalt mixture is 1.0-2.0 cm (determined by specific road conditions and design drawings).

(3) Roller compaction

The environmentally friendly multifunctional thin layer must be laminated before the temperature of the pavement is reduced to 120 ℃. And (4) statically rolling twice by using a 9-12-ton double-steel-wheel road roller. The roller cannot rest on the surface of the freshly laid hot asphalt mixture. Compaction must be performed immediately after paving. The road roller must be well maintained, have reliable operational stability, and be equipped with a soap lye water addition system and a scraper to prevent newly paved colored hot asphalt mix from sticking to the rolling wheel. Rolling is usually performed in a static manner. The engineer determines the width of the rolling operation and opens traffic after the rolling of the new pavement is completed and the pavement temperature is cooled to 50 ℃.

The above details are provided for the environment-friendly multifunctional thin-layer material and the preparation and construction method thereof provided by the embodiments of the present application. The above description of the embodiments is only for the purpose of helping to understand the method of the present application and its core ideas; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

As used in the specification and claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.

It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the application as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.