Asphalt mixture doped with basalt fibers and lignin fibers
阅读说明：本技术 一种复掺玄武岩纤维和木质素纤维的沥青混合料 (Asphalt mixture doped with basalt fibers and lignin fibers ) 是由 肖鹏 潘晓慧 范钊 伏伟俐 康爱红 吴正光 李波 寇长江 吴帮伟 吴星 于 2020-06-11 设计创作，主要内容包括：本发明公开了一种复掺玄武岩纤维和木质素纤维的沥青混合料,以质量百分比计,所述混合料包括如下组分组成：SBS改性沥青5.55%~5.64%、纤维0.285%~0.366%,矿料93.99%~94.16%。本发明将玄武岩纤维与木质素纤维按照一定比例进行复配,利用两种纤维的优缺点综合改善沥青混合料各项性能,可以有效提高SMA沥青路面的使用品质,延长道路的使用寿命,提高水稳定性,而且综合性能更好,经济效益较优。(The invention discloses an asphalt mixture doped with basalt fibers and lignin fibers, which comprises the following components in percentage by mass: 5.55-5.64% of SBS modified asphalt, 0.285-0.366% of fiber and 93.99-94.16% of mineral aggregate. According to the invention, the basalt fiber and the lignin fiber are compounded according to a certain proportion, the advantages and the disadvantages of the two fibers are utilized to comprehensively improve various performances of the asphalt mixture, the service quality of the SMA asphalt pavement can be effectively improved, the service life of the road is prolonged, the water stability is improved, the comprehensive performance is better, and the economic benefit is better.)
1. The asphalt mixture doped with basalt fibers and lignin fibers is characterized by comprising the following components in percentage by mass: 5.55-5.64% of SBS modified asphalt, 0.285-0.366% of fiber and 93.99-94.16% of mineral aggregate.
2. The method of claim 1, wherein the mineral aggregate comprises coarse and fine aggregates and ore fines, wherein the ore fines account for 7% of the total mass of the mineral aggregate, and the 1# material, the 2# material, the 3# material, and the 4# material in the coarse and fine aggregates account for 42%, 32%, 0%, and 19%, respectively, of the total mass of the mineral aggregate.
3. The method of claim 1, wherein the coarse and fine aggregate material is basalt and the ore fines are limestone ground with a particle size of less than 0.075 mm.
4. The method of claim 1, wherein the fibers comprise chopped basalt fibers and lignin fibers, the chopped basalt fibers having a length of 6mm, and the basalt fibers and the lignin fibers being in a mass ratio of 1: 1.
5. The method of claim 1 wherein the asphalt mixture is a SMA-13 gap grade.
6. The method according to claim 1, characterized in that the overall gradation ranges of coarse and fine aggregates and ore fines are as follows:
。
7. A method for preparing an asphalt mixture according to any one of claims 1 to 6, comprising the steps of:
(1) firstly, heating SBS modified asphalt in a drying oven at 165 +/-5 ℃ to a molten state, and preserving heat for later use;
(2) preheating coarse and fine aggregates in the mineral aggregate at 185 +/-5 ℃ for more than 5 hours;
(3) and (2) heating the mixing pot to 180 +/-5 ℃, adding the preheated coarse and fine aggregate into the mixing pot, doping the fiber and mixing for 90s, then adding the SBS modified asphalt for heat preservation in the step (1) and mixing for 90-95 s, and finally doping the mineral powder and mixing for 90-95 s to prepare the asphalt mixture.
Technical Field
The invention belongs to the technical field of road engineering materials, and relates to an asphalt mixture doped with basalt fibers and lignin fibers.
Background
With the rapid development of the road transportation industry in China, the phenomena of more heavy-duty vehicles with large traffic volume and even overload and overrun exist, and meanwhile, the SMA asphalt mixture is influenced by comprehensive factors such as service environment and the like, and provides a higher standard performance requirement for asphalt pavement materials.
The SMA asphalt mixture mainly uses coarse aggregate to make the high-temperature anti-rutting capability strong, the asphalt mastic binding power formed by a large amount of mineral powder, a large amount of asphalt and a small amount of fine aggregate is improved, so that the low-temperature anti-cracking and fatigue resistance of the mixture are improved, the porosity is small, water seepage is not easy, the water stability is good, and the fiber is used as a stabilizer to be doped into the SMA mixture, so that the method is an effective method for improving the comprehensive performance.
The lignin fiber can better adsorb asphalt, and more asphalt mastic is wrapped on the surface of the aggregate, so that the low-temperature performance of the asphalt mixture can be obviously improved. But the lignin fiber has the phenomenon of oil absorption of the hollow tube, and partial asphalt is absorbed into the fiber, so that the thickness of an asphalt oil film is not increased, the strength of a pavement is not improved, the consumption of the asphalt is increased, and the cost is improved; in addition, the lignin fiber has strong water absorption, so that the water stability of the mixture is poor and the durability of the mixture is influenced.
Disclosure of Invention
The invention aims to provide an asphalt mixture doped with basalt fibers and lignin fibers, wherein the water stability can be improved by doping the chopped basalt fibers and lignin fibers into the asphalt mixture in a moderate proportion, and the comprehensive performance of the asphalt mixture is greatly improved compared with that of the asphalt mixture doped with one fiber.
The purpose of the invention is realized by the following technical scheme:
the asphalt mixture doped with basalt fibers and lignin fibers comprises the following components in percentage by mass: 5.55 to 5.64 percent of SBS modified asphalt, 0.285 to 0.366 percent of fiber and 93.99 to 94.16 percent of mineral aggregate.
Further, the mineral aggregate comprises coarse and fine aggregates and mineral powder, wherein the mineral powder accounts for 7% of the total mass of the mineral aggregate, and the 1# material, the 2# material, the 3# material and the 4# material in the coarse and fine aggregates respectively account for 42%, 32%, 0% and 19% of the total mass of the mineral aggregate; the coarse and fine aggregate material is basalt, and the mineral powder is limestone ground with the granularity of less than 0.075 mm.
Further, the fibers comprise chopped basalt fibers and lignin fibers, the length of the chopped basalt fibers is 6mm, and the mass ratio of the basalt fibers to the lignin fibers is 1: 1.
Further, the asphalt mixture adopts SMA-13 discontinuous gradation.
Further, the overall grading ranges of the coarse and fine aggregates and the mineral powder are as follows:
the preparation method of the asphalt mixture doped with basalt fibers and lignin fibers comprises the following steps:
(1) firstly, heating a finished product of SBS modified asphalt in an oven at 165 +/-5 ℃ to a molten state, and preserving heat for later use;
(2) preheating coarse and fine aggregates in the mineral aggregate at 185 +/-5 ℃ for more than 5 hours;
(3) and (2) heating a mixing pot to 180 +/-5 ℃, adding the preheated coarse and fine aggregate into the mixing pot, doping the chopped basalt fiber and the lignin fiber, mixing for 90s, adding the SBS modified asphalt for heat preservation in the step (1), mixing for 90-95 s, doping the mineral powder, and mixing for 90-95 s to prepare the asphalt mixture.
Compared with the prior art, the invention has the following advantages:
(1) the asphalt mixture doped with basalt fibers and lignin fibers can improve the water stability of the asphalt mixture;
(2) the chopped basalt fibers and the lignin fibers are mixed in the asphalt mixture according to the mass ratio of 1:1, so that the advantages of the two fibers can be fully exerted, the comprehensive performance is better than that of the mixture obtained by mixing one fiber singly, and the economic benefit is better.
Detailed Description
The asphalt mixture doped with basalt fibers and lignin fibers according to the present invention will be further described with reference to the following specific examples.
The basalt fiber is a novel green material, the adsorbed asphalt is relatively less, the asphalt consumption is less, the improvement effect of the asphalt mixture is different, the high-temperature anti-rutting capability of the mixture can be obviously improved by doping the basalt fiber, and the anti-fatigue cracking capability of the asphalt mixture is greatly improved. According to the invention, the basalt fiber and the lignin fiber are compounded according to a certain proportion, and the advantages and the disadvantages of the two fibers are utilized to comprehensively improve various performances of the asphalt mixture, so that the service quality of the SMA asphalt pavement can be effectively improved, and the service life of the road is prolonged.