阅读说明：本技术 一种路强剂及含有该路强剂的沥青混合物 (Road strength agent and asphalt mixture containing same ) 是由 胡丽丽 龙泽高 于 2021-11-03 设计创作，主要内容包括：一种路强剂,其由以下重量份数的组分制备而成：高密度聚乙烯25～50份,白炭黑10～20份,纳米碳酸钙2～10份,橡胶粉5～10份,离子液体0.1～0.5份,石墨烯0.1～0.5份,蜡类增塑剂5～15份,烷基磷酸酯0.5～2份。该路强剂能够提高沥青混合料的水稳性能及低温抗开裂性等性能,同时能够显著提高沥青混合料的高温抗车辙能力。在使用方式上,该路强剂使用相当简单,在施工过程中可以直接投放,稳定性良好。(The road strength agent is prepared from the following components in parts by weight: 25-50 parts of high-density polyethylene, 10-20 parts of white carbon black, 2-10 parts of nano calcium carbonate, 5-10 parts of rubber powder, 0.1-0.5 part of ionic liquid, 0.1-0.5 part of graphene, 5-15 parts of wax plasticizer and 0.5-2 parts of alkyl phosphate. The road strength agent can improve the water stability, low-temperature cracking resistance and other properties of the asphalt mixture, and can also obviously improve the high-temperature anti-rutting capability of the asphalt mixture. In the use mode, the road strengthening agent is quite simple to use, can be directly put in the construction process, and is good in stability.)

1. The road strength agent is prepared from the following components in parts by weight:

2. the reinforcing agent according to claim 1, wherein the white carbon black is precipitated white carbon black.

3. The road strength agent according to claim 1, wherein the rubber powder has a particle size of 20 to 40 mesh.

4. The agent according to claim 1, wherein the ionic liquid is a quaternary ammonium ionic liquid and/or an imidazole ionic liquid.

5. The road strength agent as claimed in claim 1 or 4, wherein the imidazole-based ionic liquid is a quaternary amine-based ionic liquid.

6. The strength agent of claim 1, wherein the ionic liquid anion is selected from BF₄ ^-、PF₆ ^-、HCOO^-、CH₃COO^-、C₂H₅COO^-、C₆H₅COO^-、HOCH₂COO^-、HSO₄ ^-、CH₃SO₃ ^-、H₂PO₄ ^-、(CH₃O)₂PO₂ ^-At least one of (1).

7. The strength agent of claim 1, wherein the ionic liquid anion is selected from C₆H₅COO^-、HOCH₂COO^-、H₂PO₄ ^-、(CH₃O)₂PO₂ ^-At least one of (1).

8. The strength agent of claim 1, wherein the alkyl phosphate ester has a carbon chain length greater than 12.

9. The preparation method of the road strength agent is characterized by comprising the following steps:

weighing the components according to the weight fraction of any one of the road strength agents in the claims 1-8;

mixing the ionic liquid with graphene to obtain a first mixture;

mixing the first mixture with rubber powder to obtain a second mixture;

mixing the high-density polyethylene, the white carbon black, the nano calcium carbonate, the wax plasticizer, the alkyl phosphate and the mixture II to obtain a mixture III;

and feeding the mixture III into a double-screw extruder for plasticizing, banburying, granulating and cooling to obtain the road strength agent.

10. An asphalt mixture containing the road strength agent as defined in any one of claims 1 to 8, wherein the asphalt mixture comprises the road strength agent, mineral aggregate and matrix asphalt; wherein the weight ratio of the road strength agent to the mineral aggregate to the matrix asphalt is 0.05-2: 93-97: 2-6.

Technical Field

The invention relates to the field of building materials, in particular to a road strength agent and an asphalt mixture containing the same.

Background

In recent years, with economic development and social progress, highway construction has been rapidly developed. On asphalt roads in China, more and more diseases begin to appear. The diseases are various, for example, some road sections can crack due to low temperature, some road sections can have obvious ruts, and phenomena of fatigue, oil spilling and the like which cannot be ignored exist.

The road bridge disease is to driving safety and still have great influence in the aspect of the service life of road or road surface later maintenance etc. not only can bring certain threat to the vehicle that the road normally traveled, and secondly is chain effect, and when certain disease appeared, other diseases also followed, and the maintenance degree of difficulty in later stage can the straight-line rise.

Therefore, the development of a road strength agent which can be better combined with asphalt, namely, has good compatibility, higher strength and anti-rutting performance, and plays a very important role in road construction.

Disclosure of Invention

In order to solve the problem of road diseases in the prior art, the invention aims to provide a road strength agent and an asphalt mixture containing the same.

The invention provides a road strength agent which is prepared from the following components in parts by weight:

and, provide the above-mentioned preparation method of road strength, it includes the following steps:

weighing the components according to the weight fraction of the road strength agent;

mixing the ionic liquid with graphene to obtain a first mixture;

mixing the first mixture with rubber powder to obtain a second mixture;

mixing the high-density polyethylene, the white carbon black, the nano calcium carbonate, the wax plasticizer, the alkyl phosphate and the mixture II to obtain a mixture III;

and feeding the mixture III into a double-screw extruder for plasticizing, banburying, granulating and cooling to obtain the road strength agent.

Furthermore, the invention also provides an asphalt mixture containing the road strength agent, wherein the asphalt mixture comprises the road strength agent, mineral aggregate and matrix asphalt; wherein the weight ratio of the road strength agent to the mineral aggregate to the matrix asphalt is 0.05-2: 93-97: 2-6.

The road strength agent provided by the embodiment of the invention solves the problems of high cost, poor compatibility, poor dispersibility, low strength and the like of the existing road strength agent, gives full play to the excellent performances of all components, obtains a road strength agent which has the advantages of moderate manufacturing cost, high strength, excellent impact resistance, good durability, simple preparation process and convenience in operation, is suitable for bridge and tunnel pavements with severe traffic conditions, and has obvious economic performance and technical quality reliability.

Detailed Description

The foregoing and further features of the invention will be apparent from the following description of preferred embodiments, which is provided by way of example only. It is to be understood that these specific embodiments are merely illustrative of the features and advantages of the invention, which is not to be construed as limiting the invention.

The embodiment of the invention provides a road strength agent which is prepared from the following components in parts by weight:

the High Density Polyethylene (HDPE) is an extruded high density polyethylene. The high-temperature performance of the asphalt mixture can be remarkably improved by the high-density polyethylene, and meanwhile, the compatibility of HDPE and asphalt is better than that of other polymers, so that the defects that the mixing time of the road strength agent is increased and the mixing temperature needs to be increased due to the compatibility problem in the direct throwing process can be overcome. In addition, due to the molecular structure characteristic of HDPE, HDPE is easily miscible with aromatic components, and by adding ionic liquid, and by utilizing the action of the ionic liquid and graphene, and mixing with high-density polyvinyl chloride, a firm three-dimensional network structure can be formed in asphalt molecules more easily, and the dosage of the road strength agent is reduced. Preferably, the high-density polyethylene accounts for 30-40 parts.

The white carbon black is preferably precipitated white carbon black, and the white carbon black can improve the high-temperature, low-temperature and ageing resistance of the asphalt.

The nano calcium carbonate can improve the ageing resistance, and can obviously improve the rutting resistance of the pavement in cooperation with white carbon black and graphene. Preferably, the nano calcium carbonate is 3-5 parts, and the proper addition amount does not damage other performances (such as water stability and low-temperature cracking resistance) of the asphalt mixture, and also obviously improves the high-temperature rutting resistance of the asphalt mixture.

The rubber powder is rubber powder with the particle size of 20-40 meshes, the interface compatibility of asphalt and the rubber powder can be increased after the ionic liquid and the graphene are compounded, the absorption selectivity of the rubber powder on asphalt molecules in the absorption swelling process is enhanced, the interaction between the modified asphalt and the aggregate is enhanced, the road strength agent, the matrix asphalt and the minerals are uniformly compounded, and the uniformity and the consistency of the asphalt mixture are ensured.

Preferably, the ionic liquid is imidazole ionic liquid and/or quaternary amine ionic liquid, and the cation structure of the imidazole ionic liquid isR₁，R₂Are identical or different C_nH_2n+1N is more than or equal to 1 and less than or equal to 20; the cation of the quaternary ammonium ionic liquid is [ N ]₂₂₂₁]⁺、[N₄₄₄₁]⁺And [ N₄₄₄₄]⁺At least one of which is shown in the following figures. Further, the cation of the quaternary ammonium ionic liquid is preferably [ N₄₄₄₁]⁺And [ N₄₄₄₄]⁺The long hydrocarbon chain and amine group in the ionic liquid react with the aggregate surface and part of the hydrocarbon to directly generate a combination, the combination serves as a bridge on the surfaces of the hydrophilic aggregate and the hydrophobic asphalt, the strong binding force between the hydrophilic aggregate and the hydrophobic asphalt is ensured, the function of the anti-stripping agent is realized to a certain extent, and compared with a plurality of anti-stripping agents sold in the market, the thermal stability is higher due to the ionic liquid.

Further, the anion of the ionic liquid is selected from BF₄ ^-、PF₆ ^-、HCOO^-、CH₃COO^-、C₂H₅COO^-、C₆H₅COO^-、HOCH₂COO^-、HSO₄ ^-、CH₃SO₃ ^-、H₂PO₄ ^-、(CH₃O)₂PO₂ ^-At least one of (1). More preferably, said 2. ltoreq. n.ltoreq.6 and said anion is selected from HCOO^-、CH₃COO^-、C₂H₅COO^-、C₆H₅COO^-、HOCH₂COO^-、H₂PO₄ ^-、(CH₃O)₂PO₂ ^-At least one of (1).

The graphene is preferably graphene oxide and has a size of more than 500 nm.

The wax plasticizer and the ionic liquid composite graphene can play a role of adding one to two, can obviously improve the high-temperature anti-rutting capability, and simultaneously give consideration to the low-temperature anti-cracking characteristic.

The alkyl phosphate has an anti-stripping effect, preferably, the carbon chain length of the alkyl phosphate is more than 12, more preferably, the carbon chain length of the aliphatic amine is more than 12 and less than 20, and the alkyl phosphate and the ionic liquid act synergistically, so that a small amount of the alkyl phosphate can have a good anti-stripping effect and has long-term aging resistance.

The embodiment of the invention also provides a preparation method of the road strength agent, which comprises the following steps:

weighing the components according to the weight fraction of the road strength agent;

mixing the ionic liquid with graphene to obtain a first mixture;

mixing the first mixture with rubber powder to obtain a second mixture;

mixing the high-density polyethylene, the white carbon black, the nano calcium carbonate, the wax plasticizer, the alkyl phosphate and the mixture II to obtain a mixture III;

and feeding the mixture III into a double-screw extruder for plasticizing, banburying, granulating and cooling to obtain the road strength agent.

Preferably, the temperature of a feed inlet of the double-screw extruder is 110-130 ℃, the temperature of a melting stage is 135-140 ℃, the temperature of a first and a second hot-mixing stages is 140 ℃, the temperature of a fifth zone is 140 ℃, and the temperature of a discharge outlet is 135 ℃.

Furthermore, the invention also provides an asphalt mixture containing the road strength agent, wherein the asphalt mixture comprises the road strength agent, mineral aggregate and matrix asphalt; wherein the weight ratio of the road strength agent to the mineral aggregate to the matrix asphalt is 0.05-2: 93-97: 2-6.

The road strength agent provided by the embodiment of the invention can obviously improve the high-temperature anti-rutting capability of the asphalt mixture, cannot be changed by doping the anti-rutting agent when the optimal asphalt-stone ratio of the asphalt mixture is determined, and can improve the water stability and the low-temperature anti-cracking property of the asphalt mixture. In the use mode, the use of the road strength agent is quite simple, the road strength agent can be directly put in the construction process, and the stability is good. Compared with the common asphalt mixture, after the road strength agent is added, the high-temperature anti-rutting capability is improved by more than three times, the polarity of the asphalt is improved, and the physical and chemical adsorbability between the asphalt and the aggregate is improved.

The following examples are provided to illustrate the preparation and advantageous effects of the road strength agent of the present invention.

Example 1:

weighing the following raw materials in parts by weight:

mixing the ionic liquid with graphene to obtain a first mixture;

mixing the first mixture with rubber powder to obtain a second mixture;

mixing the high-density polyethylene, the white carbon black, the nano calcium carbonate and the wax plasticizer with the mixture II to obtain a mixture III;

and feeding the mixture III into a double-screw extruder for plasticizing, banburying, granulating and cooling to obtain the road strength agent. The temperature of the feed inlet of the double-screw extruder is 120 ℃, the temperature of the melting stage is 135 ℃, the temperature of the first and second stages of hot mixing is 140 ℃, the temperature of the fifth zone is 140 ℃, and the temperature of the discharge outlet is 135 ℃.

Example 2:

weighing the following raw materials in parts by weight:

mixing the ionic liquid with graphene to obtain a first mixture;

mixing the first mixture with rubber powder to obtain a second mixture;

mixing the high-density polyethylene, the white carbon black, the nano calcium carbonate and the wax plasticizer with the mixture II to obtain a mixture III;

and feeding the mixture III into a double-screw extruder for plasticizing, banburying, granulating and cooling to obtain the road strength agent. The temperature of the feed inlet of the double-screw extruder is 120 ℃, the temperature of the melting stage is 135 ℃, the temperature of the first and second stages of hot mixing is 140 ℃, the temperature of the fifth zone is 140 ℃, and the temperature of the discharge outlet is 135 ℃.

Example 3:

weighing the following raw materials in parts by weight:

mixing the ionic liquid with graphene to obtain a first mixture;

mixing the first mixture with rubber powder to obtain a second mixture;

mixing the high-density polyethylene, the white carbon black, the nano calcium carbonate and the wax plasticizer with the mixture II to obtain a mixture III;

and feeding the mixture III into a double-screw extruder for plasticizing, banburying, granulating and cooling to obtain the road strength agent. The temperature of the feed inlet of the double-screw extruder is 120 ℃, the temperature of the melting stage is 135 ℃, the temperature of the first and second stages of hot mixing is 140 ℃, the temperature of the fifth zone is 140 ℃, and the temperature of the discharge outlet is 135 ℃.

Example 4:

weighing the following raw materials in parts by weight:

mixing the ionic liquid with graphene to obtain a first mixture;

mixing the first mixture with rubber powder to obtain a second mixture;

mixing the high-density polyethylene, the white carbon black, the nano calcium carbonate and the wax plasticizer with the mixture II to obtain a mixture III;

and feeding the mixture III into a double-screw extruder for plasticizing, banburying, granulating and cooling to obtain the road strength agent. The temperature of the feed inlet of the double-screw extruder is 120 ℃, the temperature of the melting stage is 135 ℃, the temperature of the first and second stages of hot mixing is 140 ℃, the temperature of the fifth zone is 140 ℃, and the temperature of the discharge outlet is 135 ℃.

Comparative example 1:

weighing the following raw materials in parts by weight:

mixing the graphene and rubber powder to obtain a first mixture;

mixing the high-density polyethylene, the white carbon black, the nano calcium carbonate and the wax plasticizer with the mixture I to obtain a mixture II;

and feeding the mixture II into a double-screw extruder for plasticizing, banburying, granulating and cooling to obtain the road strength agent. The temperature of the feed inlet of the double-screw extruder is 120 ℃, the temperature of the melting stage is 135 ℃, the temperature of the first and second stages of hot mixing is 140 ℃, the temperature of the fifth zone is 140 ℃, and the temperature of the discharge outlet is 135 ℃.

The road strength agent obtained in the above-mentioned embodiment, mineral aggregate and matrix asphalt are mixed according to the weight ratio of 0.3: 96: 4 to prepare asphalt mixture.

The description of the properties of the bituminous material is provided to facilitate an intuitive understanding of the properties of the road-strengthening agent by those skilled in the art. Other technical indexes not listed in detail can meet the requirements of the standard JTG F40-2004 technical Specification for constructing the asphalt pavement of the highway, which is issued by the ministry of communications.

The properties of the asphalt mixtures to which the examples 1 to 4 road strength agents were added are shown in Table 1.

TABLE 1

In order to evaluate the tensile resistance of the asphalt mixture after being doped with the road strength agent, the road strength agent obtained in the example 3 is used for preparing the asphalt mixture according to the proportion of the road strength agent, the mineral aggregate and the matrix asphalt of 0.4: 96: 4 by weight, and the bending test is carried out on the asphalt mixture prepared according to the proportion of the road strength agent, the mineral aggregate and the matrix asphalt of-10 ℃. The bending property of the asphalt mixture after the road strength agent is added meets the requirement, and the tensile property is better.

TABLE 2

In order to evaluate the tensile resistance of the asphalt mixture after being doped with the road-strengthening agent, the road-strengthening agent obtained in the example 2, the mineral aggregate and the matrix asphalt are prepared into the asphalt mixture according to the weight ratio of 0.4: 96: 4 to be subjected to a bending test, and the water stability of the asphalt mixture meets the requirement.

TABLE 3

The above description is only for the specific embodiment of the present invention, and the protection scope of the present invention is not limited thereto, and any simple changes or equivalent substitutions of the technical solutions that can be obviously obtained by those skilled in the art within the technical scope of the present invention are within the protection scope of the present invention.