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CN-122010500-A - Asphalt mixture and construction process and application thereof

CN122010500ACN 122010500 ACN122010500 ACN 122010500ACN-122010500-A

Abstract

The invention discloses an asphalt mixture and a construction process and application thereof, and belongs to the technical field of road engineering materials. The construction process mainly comprises the steps of mixing aggregate and fiber to obtain mineral aggregate, dissolving an anti-stripping agent in an ethanol water solution to prepare spraying liquid, carrying out atomization spraying, stirring and standing on the mineral aggregate to obtain pretreated mineral aggregate, premixing the pretreated mineral aggregate with cement and water, spraying asphalt, and carrying out paving, standing, rolling and short-term maintenance to obtain the finished product. Compared with the prior art, the invention obviously improves the adhesiveness of asphalt and aggregate, and ensures that the mixture has excellent early water damage resistance and rapid forming strength, thereby being capable of opening traffic in a short time and being particularly suitable for night road maintenance engineering.

Inventors

  • WANG XIN
  • ZHOU XIAOXU
  • ZHENG SHUO
  • XU ZONGCHENG
  • Ning Ruilin
  • ZHENG WENJUN
  • GUO ZHENHUA
  • LI XIN
  • YANG YU
  • GAO WEI
  • ZHAO YAFANG
  • WANG YI
  • GUO XIANGJUN
  • WANG GE
  • ZHANG BO
  • YANG MIN
  • PANG HONGDI
  • PANG SHASHA
  • XIA XINPENG
  • DING YONGSHENG
  • TIAN ZHEN
  • LU SHIJUN
  • WANG SHUO
  • CUI YAPING
  • JIANG JUN
  • XING HAO

Assignees

  • 北京首发公路养护工程有限公司
  • 廊坊京台高速公路有限公司

Dates

Publication Date
20260512
Application Date
20260313

Claims (10)

  1. 1. The asphalt mixture is characterized by comprising, by weight, 80-120 parts of basalt aggregate, 0.1-0.3 part of basalt fiber, 5-10 parts of cement, 10-15 parts of SBS modified emulsified asphalt, 0.5-2 parts of water, 0.1-0.5 part of anti-stripping agent and 2-3 parts of ethanol aqueous solution.
  2. 2. A construction process of the asphalt mixture as defined in claim 1, which comprises the following steps: S1, weighing basalt aggregate, basalt fiber, cement, SBS modified emulsified asphalt, water, anti-stripping agent and ethanol water solution, and primarily mixing the basalt aggregate and the basalt fiber to obtain mineral aggregate; S2, mixing the anti-stripping agent with an ethanol aqueous solution to obtain a spraying liquid, paving the mineral aggregate into a material layer with the thickness of 10-30cm, atomizing, spraying, stirring and standing to obtain a sprayed mineral aggregate, mixing the sprayed mineral aggregate, cement and water to obtain a prewetting mixture, spraying SBS modified emulsified asphalt, and controlling the paving thickness to be 5-10mm; s3, standing for 5-10min after finishing paving at 20-27 ℃, and maintaining for 20-30min at 20 ℃ or above after rolling to obtain the asphalt mixture.
  3. 3. The construction process according to claim 2, wherein the rolling is performed by using a 20-28t rubber-tyred roller for 1-3 times at a rolling speed of 5-8km/h.
  4. 4. The construction process according to claim 2, wherein the step S2 further comprises the following steps, in parts by weight: s2, adding 0.04-0.08 part of acetic acid into 2-3 parts of ethanol water solution, stirring for 20-40S, adding 0.1-0.5 part of anti-stripping agent, mixing to obtain spraying liquid, spreading mineral aggregate into a material layer with the thickness of 10-30cm, atomizing, spraying, stirring and standing to obtain spraying mineral aggregate, mixing the spraying mineral aggregate, cement and water to obtain a prewetting mixture, spraying SBS modified emulsified asphalt, and controlling the spreading thickness to be 5-10mm.
  5. 5. The construction process according to claim 2 or 4, wherein the stirring and standing is performed by stirring once according to 15-25s of spraying, the total stirring time is 40-80s, and the standing time is 500-800s.
  6. 6. The construction process according to claim 2, wherein the step S2 further comprises the following steps, in parts by weight: S2, adding 0.04-0.08 part of acetic acid into 2-3 parts of ethanol water solution, stirring for 20-40S, adding 0.1-0.5 part of anti-stripping agent, mixing to obtain spraying liquid, spreading mineral aggregate into a material layer with the thickness of 10-30cm, atomizing, spraying, uniformly spreading 0.1-0.3 part of quicklime powder into the mineral aggregate mixed with the spraying liquid, stirring for one time according to 15-25S, stirring for 40-80S, tightly covering a material pile by a plastic film, standing for 500-800S to obtain spraying mineral aggregate, mixing the spraying mineral aggregate, cement and water to obtain a prewetting mixture, spraying SBS modified emulsified asphalt, and controlling the spreading thickness to be 5-10mm.
  7. 7. The construction process according to any one of claims 2, 4 or 6, wherein the atomized spray is an atomized spray with a nozzle distance of 20-40cm from the surface of the material.
  8. 8. The construction process according to any one of claims 2,4 or 6, wherein the anti-exfoliating agent is at least one of tallow primary amine, oleic acid amide, 2-undecyl imidazoline, laurylamine polyoxyethylene (5) ether, tallow dihydroxyethyl amine oxide, cetyltrimethylammonium chloride.
  9. 9. The construction process according to any one of claims 2,4 or 6, wherein the anti-flaking agent is formed by combining 2-undecylimidazoline and laurylamine polyoxyethylene (5) ether according to a mass ratio of 0.5-2:0.5-2.
  10. 10. Use of the asphalt mixture according to claim 1 for night maintenance construction of urban arterial roads, highways and expressways, which can rapidly open traffic after a short time of maintenance.

Description

Asphalt mixture and construction process and application thereof Technical Field The invention relates to the technical field of road engineering materials, in particular to an asphalt mixture and a construction process and application thereof. Background In road maintenance engineering, construction at night and realization of rapid traffic opening have become urgent demands in order to minimize the influence on daytime traffic. This puts extremely high performance demands on asphalt mixtures for this scenario, which must have rapid-forming and early high strength properties to develop sufficient load-carrying capacity during a brief curing period, and at the same time, excellent resistance to water damage to resist attack by night condensed moisture or sudden rainfall, ensuring road durability. The micro surfacing technology is used as an effective preventive maintenance means, and is characterized in that a cold mixing and paving process of modified emulsified asphalt is adopted. However, when the technology is applied to a fast open scene at night, the demulsification speed, the fiber reinforcement effect and the early strength development of the mixture of the emulsified asphalt must be precisely optimized and cooperatively designed to overcome the challenges brought by low temperature and short maintenance time. The prior art has explored this in many ways. For example, publication No. CN120518367a discloses an emulsified asphalt cold mix cold spread asphalt pavement material, which realizes normal temperature construction, but the design emphasis is on replacing hot mix asphalt and meeting the conventional long term performance index, and the special optimization is not performed for the extremely early strength and the water loss resistance required for the rapid open traffic at night. Publication No. CN113150566A provides a high-melting-point high-modulus asphalt mixture additive, which aims to improve the high-low temperature performance of asphalt mixtures, but the technology depends on a hot-mixing process and cannot meet the requirements of cold construction and fast traffic at night. In addition, publication No. CN118479795A discloses a fiber-free low-carbon SMA asphalt mixture, which reduces the blending temperature and cancels the fibers by surfactant compounding, but its technical path is greatly different from that of the micro-surfacing, and in order to achieve the purposes of low carbon and no fibers, the early toughness and crack resistance required by the mixture, especially a thin layer overlay, may be sacrificed to some extent. In summary, the prior art is limited to a hot-mix process, and cannot meet the cold construction requirement at night, or the cold-mix process is adopted, but the material design and performance targets are not focused on solving the core contradiction that the strength of the mixture is slowly increased and the mixture is easily corroded by moisture at night under a low-temperature environment. Therefore, development of a novel high-performance asphalt mixture at the micro-surfacing is urgently needed, and the early cohesion and water damage resistance of the mixture can be obviously improved through innovative material proportioning and modification technology under the condition of not depending on heating, so that engineering targets of night construction and rapid traffic opening are truly realized. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide an asphalt mixture which is suitable for construction at night and rapidly opens traffic, and a construction process and application thereof. In order to achieve the above object, the present invention adopts the following technical scheme: an asphalt mixture comprises the following components in parts by weight: 80-120 parts of basalt aggregate, 0.1-0.3 part of basalt fiber, 5-10 parts of cement, 10-15 parts of SBS modified emulsified asphalt, 0.5-2 parts of water, 0.1-0.5 part of anti-stripping agent and 2-3 parts of ethanol water solution. The construction process of the asphalt mixture comprises the following steps of: S1, weighing basalt aggregate, basalt fiber, cement, SBS modified emulsified asphalt, water, anti-stripping agent and ethanol water solution, and primarily mixing the basalt aggregate and the basalt fiber to obtain mineral aggregate; S2, mixing the anti-stripping agent with an ethanol aqueous solution to obtain a spraying liquid, paving the mineral aggregate into a material layer with the thickness of 10-30cm, atomizing, spraying, stirring and standing to obtain a sprayed mineral aggregate, mixing the sprayed mineral aggregate, cement and water to obtain a prewetting mixture, spraying SBS modified emulsified asphalt, and controlling the paving thickness to be 5-10mm; s3, standing for 5-10min after finishing paving at 20-27 ℃, and maintaining for 20-30min at 20 ℃ or above after rolling to obtain the asphalt mixture. The rolling is carried out by adop