阅读说明：本技术 一种赤泥基纳米抗剥落剂及其制备方法和应用 (Red mud-based nano anti-stripping agent and preparation method and application thereof ) 是由 张吉哲 李沛钊 姚占勇 梁明 刘贵翔 许尚江 刘伟 于 2019-10-15 设计创作，主要内容包括：本发明涉及沥青混凝土的制备技术领域,尤其涉及一种赤泥基纳米抗剥落剂及其制备方法和应用。所述方法包括：1)将4种工业固废材料与表面活性剂按一定比例混合,进行超微粉碎后制成一定粒度的粉体,并密封包装,得到本发明所述的赤泥基纳米抗剥落剂；2)将步骤1)中得到的赤泥基纳米按照一定比例加入70#道路基质沥青中制得加入抗剥落剂的沥青；3)使用步骤2)中得到的沥青制备花岗岩沥青混凝土。本发明通过使用赤泥基纳米抗剥落剂掺入花岗岩沥青混凝土中,可以有效提高花岗岩沥青混凝土的高低温性能和抗水损害能力,有效保证了花岗岩沥青混凝土的服役性能。(The invention relates to the technical field of asphalt concrete preparation, in particular to a red mud-based nano anti-stripping agent and a preparation method and application thereof. The method comprises the following steps: 1) mixing 4 industrial solid waste materials and a surfactant according to a certain proportion, carrying out superfine grinding to prepare powder with a certain particle size, and sealing and packaging to obtain the red mud-based nano anti-stripping agent; 2) adding the red mud-based nano particles obtained in the step 1) into No. 70 road matrix asphalt according to a certain proportion to prepare asphalt added with an anti-stripping agent; 3) preparing granite asphalt concrete by using the asphalt obtained in the step 2). According to the invention, the red mud-based nano anti-stripping agent is doped into the granite asphalt concrete, so that the high-low temperature performance and the water damage resistance of the granite asphalt concrete can be effectively improved, and the service performance of the granite asphalt concrete is effectively ensured.)

1. The red mud-based nano anti-stripping agent is characterized by comprising the following raw materials in parts by weight: 75-90 parts of red mud, 2-5 parts of slaked lime, 5-10 parts of white mud, 2-5 parts of fly ash and 1-5 parts of surfactant.

2. The red mud-based nano anti-stripping agent as claimed in claim 1, wherein the red mud is one or two of sintering process red mud and Bayer process red mud.

3. The red mud-based nano anti-stripping agent as claimed in claim 1 or 2, wherein the surfactant is one or more of silane coupling agent, titanate coupling agent, dodecyl, octadecyl quaternary ammonium salt.

4. The method for preparing the red mud-based nano anti-stripping agent according to any one of claims 1 to 3, which is characterized by comprising the following steps:

(1) crushing red mud, slaked lime, fly ash and white mud respectively, and drying to remove water in the red mud, the slaked lime, the fly ash and the white mud; mixing the dried raw materials in proportion, and then carrying out ball milling to obtain a powder mixture;

(2) and (2) uniformly mixing the powder mixture obtained in the step (1) with a surfactant, and then crushing to obtain the nano-silver/nano.

5. The method as claimed in claim 4, wherein in the step (1), the drying temperature is 100-120 ℃ and the time is 1-3 h;

preferably, in the step (1), the ball milling is carried out according to the particle size required by the filler in technical Specification for road asphalt pavement construction (JTG F40-2004);

preferably, in the step (2), the pulverization is performed in accordance with a criterion that a pass rate of 0.3 μm in particle size is more than 90%.

6. The granite asphalt concrete is characterized by comprising the following raw materials in parts by weight: 50-80 parts of coarse aggregate, 20-50 parts of fine aggregate, 3-6 parts of asphalt, 1-3 parts of anti-stripping agent and 2-6 parts of filler, wherein the anti-stripping agent is the red mud-based nano anti-stripping agent prepared by the method of claim 4 or 5.

7. The granite asphalt concrete of claim 6, where the coarse aggregate is granite aggregate;

preferably, the fine aggregate is any one of granite, limestone and basalt;

preferably, the asphalt is any one of 70# base asphalt, SBS modified asphalt, rubber modified asphalt and the like;

preferably, the filler is limestone mineral powder.

8. The method for preparing granite asphalt concrete according to claim 6 or 7, characterized by comprising the following steps:

s1, preheating the coarse aggregate and the fine aggregate respectively to be used as aggregates of the asphalt mixture for later use; drying the filler and then using the dried filler as the filler of the asphalt mixture for later use;

s2, heating the asphalt to be completely melted, then adding the red mud-based nano anti-stripping agent, and uniformly stirring to obtain the asphalt added with the anti-stripping agent;

and S3, mixing the coarse aggregate and the fine aggregate, stirring to pre-mix the coarse aggregate and the fine aggregate, then mixing the obtained mixture of the coarse aggregate and the fine aggregate with the asphalt added with the anti-stripping agent obtained in the step S2, stirring uniformly, finally adding the filler obtained in the step S1, and uniformly mixing to obtain the granite asphalt concrete.

9. The production method according to claim 8, wherein the preheating conditions in step S1 are: preheating for 2-4h at the temperature of 160-;

preferably, in step S2, the stirring is performed at a low speed, i.e., the stirring speed is 100-;

preferably, in step S2, the stirring conditions after mixing the coarse aggregate and the fine aggregate are as follows: dry-stirring at 160-180 ℃ for 30-60 seconds.

10. Use of the red mud-based nano anti-spalling agent of any one of claims 1 to 3 and/or the product prepared by the method of claim 4 or 5, the granite asphalt concrete of claim 6 or 7 and/or the product prepared by the method of claim 8 or 9 in highways, such as for preparing granite asphalt concrete AC-13, AC-20, AC-25, SMA-13.

Technical Field

The invention relates to the technical field of asphalt concrete preparation, in particular to a red mud-based nano anti-stripping agent suitable for granite asphalt concrete and a preparation method and application thereof.

Background

The information disclosed in this background of the invention is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Since Shenyang in 1988 to the construction of communication vehicles on large connecting highways, highways in China have not developed at all before. By the end of 2017, the highway driving mileage of China breaks through 13.6 kilometers and is the first place in the world, wherein the asphalt pavement accounts for more than 90%. The stone materials used by the hot-mix asphalt mixture are alkaline or neutral stone materials such as limestone, basalt and the like, and the stone materials have good adhesion with weakly acidic asphalt and are not easy to peel. The stone is a non-renewable resource, and with the acceleration of highway construction and maintenance pace, the storage amount of basalt and limestone is less and less, which brings great pressure to highway construction and managers. Meanwhile, the distribution of stones in China is extremely unbalanced, and stones commonly adopted by asphalt pavements such as basalt and limestone in inner Mongolia, Shanxi, Guangdong, Guangxi, Fujian and the like in China are deficient, so that great inconvenience is brought to local highway builders, and the development of the asphalt pavements is restricted. In the Shandong area, limestone is mainly distributed in the Luzhong and Lunan areas, basalt is mainly distributed in a small part of the Luzhong area, the reserve is extremely limited, and the Jiaodong peninsula area serving as a main position opened by Shandong province to the outside is mainly granite. In addition, the environmental protection consciousness is increasingly strengthened, and a plurality of stone factories in Shandong areas are closed, so that the supply and demand of high-quality aggregates are not met, and the construction of local traffic infrastructures is seriously influenced. In order to ensure the project progress, highway construction and management units have to purchase high-quality aggregates from other places, and additional cost is generated in long-distance transportation, so that the price of the stone is greatly increased, and the highway construction and management units do not accord with sustainable development and intensive development advocated by the traffic industry in China. Therefore, the search for alternative materials is urgent.

By 2018, the highway mileage of Shandong province exceeds 6000 kilometers, and the highway under construction exceeds 2300 kilometers. It is expected that the mileage will exceed 8000 km by 2022. Among them, there are expressways close to 1/3 located in the semiisland area of Jiaodong, these expressways are scarce in high quality aggregate such as limestone, basalt, etc., and the granite type acid aggregate is quite abundant, and its use is limited due to the problem of adhesion with asphalt. If the granite can be used as the aggregate of the asphalt pavement, the good physical and mechanical properties of the granite can be fully exerted, the service life of the pavement can be prolonged, the problem of shortage of high-quality stones on the high-speed pavement in the Jiaodong peninsula area can be solved, the waste of resources is avoided, the production cost of engineering is reduced, the construction period is shortened, and the development of local related industries is driven, so that the brought economic benefit and social benefit are huge. Therefore, how to provide a reasonable and feasible method for improving the adhesion between granite and asphalt is necessary, which can not only reduce the construction cost and save the cost, but also provide theoretical basis and technical support for new asphalt pavement materials.

In order to improve the adhesion between granite aggregate and asphalt, a great deal of research is carried out by domestic and foreign scholars, various surfactants are developed along with the rapid development of surface chemistry, and a plurality of anti-stripping agents are generated. The anti-stripping agent is used as a bridge for connecting aggregate and asphalt, and is combined with the asphalt through the oleophylic group and the hydrophilic group, so that the adhesion of the asphalt and the aggregate is improved. However, the market of the organic anti-stripping agent is relatively disordered at present, and the quality of the material is uneven. In addition, the addition of a certain amount of slaked lime can also improve the adhesion of granite aggregates and asphalt, thereby improving the water damage resistance of granite asphalt concrete. However, with the enhancement of environmental protection policy, the yield of the slaked lime is obviously reduced, so that the slaked lime is high in price and difficult to control in quality.

Disclosure of Invention

Aiming at the problems, the invention aims to provide the red mud-based nano anti-stripping agent and the preparation method and the application thereof, the anti-stripping agent takes solid waste as a main raw material, not only can effectively improve the problem of poor adhesion between granite aggregate and asphalt, but also can improve the high-temperature stability of granite asphalt concrete and effectively prevent water damage and high-temperature rutting of the granite asphalt concrete. Meanwhile, the main material of the anti-stripping agent is red mud, so that the cost of raw materials can be obviously reduced, and the anti-stripping agent has good environmental benefit.

The first object of the present invention: provides a red mud-based nano anti-stripping agent.

The second object of the present invention: provides a preparation method of a red mud-based nano anti-stripping agent.

The third object of the present invention: provides granite asphalt concrete.

The fourth object of the present invention: provides a preparation method of granite asphalt concrete.

The fifth object of the present invention: the red mud-based nano anti-stripping agent and the product prepared by the preparation method thereof, and the granite asphalt concrete and the application of the product prepared by the preparation method thereof are provided.

In order to realize the purpose, the invention discloses the following technical scheme:

firstly, the invention discloses a red mud-based nano anti-stripping agent which comprises the following raw materials in parts by weight: 75-90 parts of red mud, 2-5 parts of slaked lime, 5-10 parts of white mud, 2-5 parts of fly ash and 1-5 parts of surfactant.

Secondly, the invention discloses a preparation method of a red mud-based nano anti-stripping agent, which comprises the following steps:

(1) crushing red mud, slaked lime, fly ash and white mud respectively, and drying to remove water in the red mud, the slaked lime, the fly ash and the white mud; mixing the dried raw materials in proportion, and then carrying out ball milling to obtain a powder mixture;

(2) and (2) uniformly mixing the powder mixture obtained in the step (1) with a surfactant, and then crushing to obtain the nano-silver/nano.

The invention further provides granite asphalt concrete which comprises the following raw materials in parts by weight: 50-80 parts of coarse aggregate, 20-50 parts of fine aggregate, 3-6 parts of asphalt, 1-3 parts of anti-stripping agent and 2-6 parts of filler, wherein the anti-stripping agent is the red mud-based nano anti-stripping agent provided by the invention.

Secondly, the invention discloses a preparation method of granite asphalt concrete, which comprises the following steps:

s1, preheating the coarse aggregate and the fine aggregate respectively to be used as aggregates of the asphalt mixture for later use; drying the filler and then using the dried filler as the filler of the asphalt mixture for later use;

s2, heating the asphalt to be completely melted, then adding the red mud-based nano anti-stripping agent, and uniformly stirring to obtain the asphalt added with the anti-stripping agent;

and S3, mixing the coarse aggregate and the fine aggregate, stirring to pre-mix the coarse aggregate and the fine aggregate, then mixing the obtained mixture of the coarse aggregate and the fine aggregate with the asphalt added with the anti-stripping agent obtained in the step S2, stirring uniformly, finally adding the filler obtained in the step S1, and uniformly mixing to obtain the granite asphalt concrete.

Finally, the invention discloses a red mud-based nano anti-stripping agent, a product prepared by the preparation method of the red mud-based nano anti-stripping agent, granite asphalt concrete and application of the product prepared by the preparation method of the granite asphalt concrete in highways.

Compared with the prior art, the invention has the following beneficial effects:

(1) the red mud-based nano anti-stripping agent provided by the invention has the main component of solid waste, and can be applied to highway engineering construction in a large scale, so that the environment can be protected, a large amount of waste residues can be treated, and the construction cost and the industrial production cost are reduced.

(2) Aiming at the mineral composition and surface appearance characteristics of granite, an organic-inorganic composite modification technology is adopted to research and develop a high-performance asphalt anti-stripping agent with coordinated and unified structural stability, adhesion and intermiscibility, so that the problem of weak adhesion of acid granite aggregate and asphalt is solved, and the service performance of the asphalt pavement is effectively improved.

(3) The invention can obviously improve the water damage resistance of the granite asphalt concrete, reduce the early diseases of the asphalt pavement, and can use granite to replace basalt and limestone in the asphalt pavement, thereby reducing the construction cost and saving the cost.

Detailed Description

It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms also are intended to include the plural forms as well, unless the context clearly indicates otherwise, and it should be further understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, devices, components, and/or combinations thereof.

As mentioned above, it is necessary to provide a reasonable and feasible method to improve the adhesion between granite and asphalt, which can not only reduce the construction cost and save the cost, but also provide the theoretical basis and technical support for the new material of asphalt pavement. Therefore, the red mud-based nano anti-stripping agent is suitable for granite asphalt concrete and the preparation method thereof.

In some typical embodiments, the red mud is one or both of a sintering process red mud and a bayer process red mud.

In some typical embodiments, the surfactant is one or more of a silane coupling agent, a titanate coupling agent, dodecyl, octadecyl quaternary ammonium salt.

In some typical embodiments, in step (1), the drying temperature is 100-120 ℃ and the drying time is 1-3 h.

In some exemplary embodiments, in step (1), the ball milling is performed according to the particle size required for filler in road asphalt pavement construction specifications (JTG F40-2004). The purpose of ball milling is mainly two ways: 1) the particle sizes of the four powder materials are reduced, so that subsequent surface modification and deep grinding treatment are facilitated; 2) the gaps on the surface of the red mud powder can be filled with other three kinds of powder, so that the structure is more compact, and the purpose of mechanical modification is achieved.

In some exemplary embodiments, in step (2), the pulverization is performed according to a criterion that a particle size of 0.3 μm pass rate is more than 90%. The mixed and ground powder mixture is treated by a surfactant, so that the structural state and stability of the red mud-based anti-stripping agent in asphalt can be improved, the adhesion and water stability of asphalt cement can be improved, and the interface interaction between the acidic granite aggregate and the asphalt cement can be enhanced.

In some exemplary embodiments, the coarse aggregate is a granite aggregate, and the adhesion rating is not a mandatory specification.

In some typical embodiments, the fine aggregate is any one of granite, limestone and basalt, and the specific index of the fine aggregate meets the basic requirement of technical Specification for construction of road asphalt pavement (JTG F40-2004) on coarse aggregate.

In some typical embodiments, the asphalt is any one of 70# base asphalt, SBS modified asphalt, rubber modified asphalt and the like, and the specific index of the asphalt meets the basic requirement of technical Specification for road asphalt pavement construction (JTG F40-2004) on the asphalt.

In some typical embodiments, the filler is limestone ore powder, and the specific index of the limestone ore powder meets the basic requirements of technical Specification for road asphalt pavement construction (JTG F40-2004) on the filler.

In some exemplary embodiments, the preheating conditions in step S1 are: preheating for 2-4h at the temperature of 160 ℃ and 190 ℃.

In some exemplary embodiments, in step S2, the stirring is performed at a low speed, i.e., a stirring speed of 100-.

In some exemplary embodiments, in step S2, the stirring conditions after mixing the coarse and fine aggregates are: dry-stirring at 160-180 ℃ for 30-60 seconds.

In some typical embodiments, the red mud-based nano anti-stripping agent is used for preparing various granite asphalt concretes, such as AC-13, AC-20, AC-25, SMA-13 and the like.

The invention will now be further described with reference to specific embodiments.

In the following examples, the red mud is available from Shandong aluminum industries; the red mud is industrial polluting waste discharged when the aluminum oxide is extracted in the aluminum production industry.

The white mud is purchased from the silver star paper mill of east province; the white mud is solid waste produced in the causticizing stage of pulping and papermaking industry, and mainly contains calcium carbonate and sodium carbonate and a small amount of lignin fiber.

The fly ash is purchased from mineral processing factories in the North Da industry; the fly ash is fine ash captured from flue gas generated after coal combustion, and the main component of the fly ash is SiO₂、Al₂O₃、FeO、Fe₂O₃And the like.