阅读说明：本技术 一种阻热型超薄罩面及其施工方法 (Heat-resistant ultrathin cover and construction method thereof ) 是由 马涛 付坤 黄晓明 张伟光 徐光霁 于 2020-01-10 设计创作，主要内容包括：本发明公开了一种阻热型超薄罩面,其组成成分以及各成分质量份数分别为：精细碎石：100份、阻热型高浓改性乳化沥青：10～15份、阻热型乳化沥青：5～10份。该发明施工工艺主要包括交通管制、原路面强度检测评价、温度测定、原路面清扫、放线、下层阻热型高浓改性乳化沥青洒布、集料撒布、浮石清扫、上层阻热型乳化沥青洒布、初期养护及质量检验等步骤。本发明能够有效避免目前施工通车后造成的“飞石”现象,同时能够利用阻热型改性乳化沥青的阻热优点,降低路面温度,减少道路高温病害。(The invention discloses a heat-resistant ultrathin cover surface, which comprises the following components in parts by weight: fine crushing stone: 100 parts of heat-resistant high-concentration modified emulsified asphalt: 10-15 parts of heat-resistant emulsified asphalt: 5-10 parts. The construction process mainly comprises the steps of traffic control, original pavement strength detection and evaluation, temperature measurement, original pavement cleaning, line releasing, lower-layer heat-resistant high-concentration modified emulsified asphalt distribution, aggregate spreading, pumice cleaning, upper-layer heat-resistant emulsified asphalt distribution, initial maintenance, quality inspection and the like. The invention can effectively avoid the phenomenon of 'flying stones' caused after the construction traffic at present, and can utilize the heat-resistant advantage of the heat-resistant modified emulsified asphalt to reduce the temperature of the road surface and reduce the high-temperature diseases of the road.)

1. The utility model provides a hinder ultra-thin top facing of heat type which characterized in that: the used materials and the parts by weight of the materials are respectively as follows:

fine crushing stone: 100 portions of,

Heat-resistant high-concentration modified emulsified asphalt: 10 to 15 parts of,

Heat-resistant emulsified asphalt: 5-10 parts.

2. The heat resistant ultrathin overlay of claim 1 wherein: the fine crushed stone meets the following requirements:

the fine aggregate has a particle size of 4-6 mm,

The apparent relative density is more than or equal to 2.5,

The firmness is less than or equal to 12 percent,

The mud content is less than or equal to 3 percent,

The edge angle is more than or equal to 30s,

The coating property of the asphalt is more than or equal to 2/3.

3. The heat resistant ultrathin overlay of claim 1 wherein: the heat-resistant high-concentration modified emulsified asphalt comprises the following components in parts by mass:

matrix asphalt: 100 portions of,

Heat-resistant agent: 10 to 20 parts of,

Modifying the latex: 1 to 4 parts of,

Emulsifier: 1 to 3 parts of,

Auxiliary agent: 1 to 3 parts of,

Water: 30-40 parts.

4. The heat resistant ultrathin overlay of claim 1 wherein: the heat-resistant emulsified asphalt comprises the following components in parts by mass:

matrix asphalt: 100 portions of,

Heat-resistant agent: 10 to 20 parts of,

Modifying the latex: 1 to 4 parts of,

Water: 30-40 parts.

5. The heat resistant ultrathin overlay of claim 3 or 4 wherein: the heat resisting agent is SiO₂Aerogel modified silicone resin latex prepared from SiO₂The aerogel powder and the organic silicon resin are mixed according to the ratio of 1: 3-1: 5 by weight ratio; the SiO₂The aerogel powder meets the following technical requirements:

particle size: 20 to 30nm,

Specific surface area: 350-500 m²/g、

The heat conductivity coefficient is: 0.0235-0.0385W/(m.k),

Gel pH: 6 to 7,

The drying weight loss is less than or equal to 0.5 percent,

Ignition loss is less than or equal to 1.0%,

The water content is less than or equal to 1.5 percent.

6. The heat resistant ultrathin overlay of claim 3 or 4 wherein: the modified latex is SBR modified latex or SBS modified latex, and the solid content of the modified latex is larger than or equal to 45%.

7. The heat resistant ultrathin overlay of claim 3 wherein: the emulsifier is a cationic emulsifier.

8. The heat resistant ultrathin overlay of claim 3 wherein: the auxiliary agent is an inorganic silicon dioxide aerogel surfactant.

9. The heat-resistant modified emulsified asphalt as claimed in claim 3 or 4, wherein: the water is drinking water meeting the drinking requirements of human beings.

10. The heat resistant ultrathin overlay of claim 1 wherein: the construction method comprises the following steps:

(1) temperature detection and original pavement evaluation

Detecting and evaluating the temperature, the track depth, the anti-skid coefficient and the like of the original pavement to determine the using amount of the heat-resistant high-concentration modified emulsified asphalt;

(2) spreading construction

Respectively spreading heat-resistant high-concentration modified emulsified asphalt and fine macadam on the original pavement, wherein the spreading rate of the macadam is not lower than 120%;

(3) rolling construction

Before the temperature of the road surface is reduced to 120 ℃, a 12t light rubber-tyred roller is adopted to slowly and uniformly roll for 1-2 times, the rolling speed is less than 5krn/h, and the speed is reduced when the roller is started and stopped;

(4) pumice cleaning

Cleaning pumice on the surface of the asphalt by using a powerful blower or other cleaning equipment, and finally forming a thin-layer cover surface with the thickness of 4-6 mm based on the modified emulsified asphalt which does not expose out of the bottom layer and absorbs the automobile exhaust;

(5) spreading upper seal asphalt

And (3) spreading heat-resistant emulsified asphalt on the surface of the cleaned fine crushed stone by using an asphalt spreading vehicle.

Technical Field

The invention discloses a heat-resistant ultrathin cover technology suitable for urban roads, tunnel pavements and bridge decks, belonging to the technical field of processes and construction in pavement engineering.

Background

Transportation plays an important role in national economy, the national economy develops rapidly, and road transportation tasks are also aggravated continuously, on one hand, the transportation tasks are definite to the previous transportation effect, on the other hand, higher requirements are also put forward on future transportation, particularly on road transportation, the road performance of the road is guaranteed to be the most basic requirement of each project, and the social benefit and the economic benefit of the road are directly influenced by the road performance.

In China, asphalt concrete pavements are widely applied to highways and urban roads and are the main pavement form of expressways with good pavement service performance, sufficient mechanical strength and simple and convenient maintenance work. However, the asphalt concrete pavement often has diseases such as cracking, oil flooding, pot holes, ruts and the like, wherein the ruts appearing at high temperature in summer are particularly prominent, so that the service performance of the pavement is influenced, the cost of later maintenance is increased, and particularly, the ruts are easy to accumulate water in rainy season, cause tire skidding and even endanger life. Therefore, how to reduce solar radiation, reduce the temperature of the road surface, improve the high-temperature stability of the road surface and reduce the generation of ruts needs to be solved urgently.

The thin-layer overlay technology mainly aims at the pavement with perfect structure but reduced surface function, namely, the thin-layer overlay technology only has the advantages of not meeting the use requirements of skid resistance, flatness and high-temperature stability, having no structural diseases, being a functional maintenance technology, being green and environment-friendly, saving energy and being economical, reducing the later maintenance cost and the like. Meanwhile, the method conforms to the sustainable development strategy of road construction, and has good economic and social benefits. The technology of thin-layer finishing has already begun to be widely used in the sixties of the last century, and is particularly prevalent in france, mainly in the following four stages: in the 60 s, BBSG (50-80 mm asphalt concrete) can reinforce the pavement structure; second, in the 70 s, BBM (30-40 mm thin-layer asphalt concrete); ③ 20-30 mm of very thin asphalt concrete surface course (BBTM) in 1986; and 15-20 mm ultrathin asphalt concrete surface course (BBUM). The development of the technology in China is limited to equipment, construction process or emulsified asphalt raw materials. Therefore, the inventor develops the heat-resistant ultrathin covering technology on the basis of combining the requirement of the road on high-temperature stability and the advantage of the ultrathin covering by taking the reference of the current construction process of the gravel sealing layer. The technology can effectively avoid the phenomenon of 'flying stones' caused after the current construction traffic, and can utilize the heat-resistant advantage of the heat-resistant modified emulsified asphalt to reduce the temperature of the pavement and reduce the high-temperature diseases of the road.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the existing asphalt concrete pavement is easy to crack, flood, pit grooves, tracks and other diseases at high temperature, thereby not only influencing the service performance of the pavement and increasing the cost of later maintenance, but also causing the phenomenon of 'flying stones' of the existing gravel seal construction process.

In order to solve the technical problems, the invention adopts the technical scheme that: a heat-resistant ultrathin cover technology is provided, and the used materials and the parts by weight of the materials are respectively as follows:

fine crushing stone: 100 portions of,

Heat-resistant high-concentration modified emulsified asphalt: 10 to 15 parts of,

Heat-resistant emulsified asphalt: 5-10 parts.

Specifically, the fine crushed stone should satisfy the following physical indexes:

the particle size of the fine aggregate: 4-6 mm,

The apparent relative density is more than or equal to 2.5,

The firmness is less than or equal to 12 percent,

The mud content is less than or equal to 3,

The edge angle is more than or equal to 30s,

The coating property of the asphalt is more than or equal to 2/3.

Meanwhile, the heat-resistant high-concentration modified emulsified asphalt is used as a raw material for reducing solar radiation and effectively reducing the temperature of a pavement, and comprises the following components in parts by mass:

matrix asphalt: 100 portions of,

Heat-resistant agent: 10 to 20 parts of,

Modifying the latex: 1 to 4 parts of,

Emulsifier: 1 to 3 parts of,

Auxiliary agent: 1 to 3 parts of,

Water: 30-40 parts.

SiO₂The aerogel has higher porosity and is more crisp and loose, indicating thatThe adhesive has very large surface area, and the thermal conductivity of the adhesive can be well reduced by dispersing the adhesive in the asphalt adhesive, so that the adhesive has an important effect on reducing the temperature of the pavement. Therefore, the invention uses SiO₂The aerogel modified organic silicon resin latex is combined with the asphalt material, so that the aerogel modified organic silicon resin latex and the asphalt material are fully combined to form a novel asphalt mixture binding material, and the purposes of reducing the pavement temperature, having a good heat insulation effect, enhancing the high-temperature stability of the material, reducing the track damage and improving the pavement performance are achieved.

Specifically, the heat resistant agent is SiO₂Aerogel modified silicone resin latex, using SiO₂The aerogel powder is compounded with organic silicon resin according to the weight ratio of 1: 3-1: 5, the organic silicon resin is used as a modifier carrier, and the organic silicon resin is compounded with an asphalt modifier to modify matrix asphalt, wherein SiO is₂The aerogel powder meets the following technical requirements:

particle size: 20 to 30nm,

Specific surface area: 350-500 m²/g、

Coefficient of thermal conductivity: 0.0235-0.0385W/(m.k),

Gel pH: 6 to 7,

The drying weight loss is less than or equal to 0.5 percent,

Ignition loss is less than or equal to 1.0%,

The water content is less than or equal to 1.5 percent.

When SiO is present₂When the particle size of the aerogel powder is 20-30 nm, experiments show that the specific surface area is large, and the heat conductivity coefficient is in a low range, so that the heat transferred below the surface layer is reduced, and the heat insulation and heat preservation effects are better.

Specifically, the modified latex is SBR modified latex or SBS modified latex, and the solid content of the modified latex is not less than 45%.

The solid content of the modified latex is regulated according to technical Specification for road asphalt pavement construction (JTG F40-2004): not less than 45%. Meanwhile, compared with other modified latexes, the SBR modified latex or the SBS modified latex is more widely used, and the SBS has the characteristics of rubber and plastic, has lower viscosity at the mixing temperature, and can form a net structure in the asphalt so as to change the mechanical property of the asphalt, so that the SBS is quite suitable to be used as a modified material of the asphalt.

Specifically, the emulsifier is a cationic emulsifier. The emulsifier can be cation middle-split emulsifier or cation slow-split emulsifier. In general, it is preferable to use a slow-breaking cationic emulsifier, and when it is necessary to regenerate a structural layer more quickly, a medium-breaking cationic emulsifier is used.

Specifically, the auxiliary agent is an inorganic silicon dioxide aerogel surfactant.

Specifically, the water is drinking water meeting the drinking requirements of human beings.

Detailed description of the preferred embodiments

(1) Traffic control

Before construction, the construction system needs to be contacted with a local traffic management department, and simultaneously, traffic control schemes are formulated together; the influence of construction on traffic should be reduced as much as possible; the traffic signs should be placed 2h before paving. The traffic sign is striking, and a reflective sign is adopted during night construction;

(2) temperature detection and original pavement evaluation

Detecting and evaluating the temperature, the track depth, the anti-slip coefficient and the like of the original pavement so as to determine the using amount of the heat-resistant modified emulsified asphalt;

(3) personnel division and equipment configuration

The composition of the personnel of the construction team is basically consistent with that of the personnel of the ordinary asphalt concrete pavement construction team. Transporting the broken stone seal coat vehicle and the asphalt distribution vehicle to a construction road section, adjusting the parking places, and calibrating the asphalt and aggregate using amount according to the design mixing ratio;

(4) spreading construction

Respectively spreading heat-resistant high-concentration modified emulsified asphalt and fine macadam on the original pavement, wherein the spreading rate of the macadam is not lower than 120%; the distance between the gravel spreading vehicle and the asphalt spreading vehicle is controlled within 20 m;

(5) rolling construction

Before the temperature of the road surface is reduced to 120 ℃, a 12t light rubber-tyred roller is adopted to slowly and uniformly roll for 1-2 times, the rolling speed is less than 5krn/h, and the speed is reduced when the roller is started and stopped;

(6) pumice cleaning

Cleaning pumice on the surface of the asphalt by using a powerful blower or other cleaning equipment, and finally forming a super thin-layer cover surface with the thickness of 4-6 mm based on the modified emulsified asphalt which does not expose out of the bottom layer and absorbs the automobile exhaust;

(7) spreading upper seal asphalt

Spreading heat-resistant emulsified asphalt on the surface of the cleaned fine crushed stone by using an asphalt spreading vehicle;

(8) initial maintenance and open traffic

And (3) prohibiting any vehicle and pedestrian from passing through, opening the traffic within 2-4 h after the construction is finished, and controlling the vehicle speed to be not more than 60km/h within 24h after the traffic is opened.

The invention can effectively avoid the phenomenon of 'flying stones' caused after the construction traffic at present, and can utilize the heat-resistant advantage of the heat-resistant modified emulsified asphalt to reduce the temperature of the road surface and reduce the high-temperature diseases of the road.