Abstract
In order to improve the road performance of drainage SBS modified asphalt mixture, basalt fiber was added to prepare drainage styrene-butadiene-styrene (SBS) modified asphalt mixture. The viscosity-toughness, toughness, and 60°C dynamic viscosity of SBS modified asphalt were tested. The modification effect was evaluated from the perspective of high and low temperature rheological properties by dynamic shear rheometer (DSR) and bending beam rheometer (BBR) tests. The high temperature stability, water stability, low temperature crack resistance, and drainage of basalt fiber SBS drainage asphalt mixture were evaluated and compared with nonfiber SBS drainage asphalt mixture and TPS drainage asphalt mixture. The morphology characteristics of asphalt mixture and the distribution of basalt fiber in the mixture were analyzed from a micro perspective. The results showed the following: the overall performance of basalt fiber is better than that of lignin fiber. SBS modifier content in 7% can meet the requirements of drainage asphalt pavement on asphalt binder. The optimum asphalt content of SBS modified asphalt mixture with basalt fiber content of 0, 0.15, 0.25, and 0.35% is 4.9, 5.05, 5.15, and 5.2%. The fiber is irregularly distributed in the mixture to form a three-dimensional network structure, which has a series skeleton function. It plays a tensile role in the initial cracking of asphalt mixture and prevents further expansion of cracks.
Highlights
With the proposal of ‘sponge city’ construction in China, drainage asphalt pavement has attracted more and more attention [1,2,3]. e drainage asphalt pavement surface layer adopts large void open graded asphalt mixture, and the middle and lower layers adopt dense graded asphalt mixture
Due to the small content of fine aggregate and mineral powder in the drainage asphalt pavement mixture, there are a large number of communicating interstices, air and rainwater are easy to penetrate into the internal structure, and they are prone to aging and reduce the service life; drainage asphalt mixture is an open-graded skeleton void structure with more coarse aggregate and less adhesive force, so the asphalt binder used in drainage asphalt pavement should have strong adhesion, antistripping, and water resistance to aggregate [6,7,8,9,10,11,12,13]
In 1999, fiber was introduced into China for the first time, and some highway projects began to use fiber as additive to improve the road performance of asphalt mixture. rough exploring the mechanism of basalt fiber in asphalt mixture [16, 17], it is found that basalt fiber has the best high temperature stability and shear strength among several fibers, which can significantly improve the rutting resistance factor and water stability of asphalt mortar [18,19,20,21,22]
Summary
With the proposal of ‘sponge city’ construction in China, drainage asphalt pavement has attracted more and more attention [1,2,3]. e drainage asphalt pavement surface layer adopts large void open graded asphalt mixture, and the middle and lower layers adopt dense graded asphalt mixture. E drainage asphalt pavement surface layer adopts large void open graded asphalt mixture, and the middle and lower layers adopt dense graded asphalt mixture It has good noise reduction, drainage, and antiskid performance, which can effectively improve the safety of travel in rainy days and reduce noise pollution to a certain extent [4, 5]. E incorporation of SBS modifier into asphalt mixture can greatly improve the rutting resistance, and the high temperature stability is better, and the water stability of drainage asphalt mixture is effectively improved [25,26,27,28,29]. Basalt fiber can improve the dispersion of mineral powder, has toughening and reinforcing effect, and can improve pavement performance and prolong service life; SBS modifier has the advantages of high softening point, high viscosity, large elongation, and strong antistripping property. This paper intends to prepare the drainage SBS modified asphalt mixture with basalt fiber and puts forward the preparation method of high-speed shear SBS modified asphalt. e rheological properties of modified asphalt are analyzed by DSR test and BBR test. e high temperature stability, low temperature crack resistance, water stability, and drainage performance are comprehensively studied through rutting test, immersion Marshall test, freeze-thaw splitting test, and low temperature bending test. e mechanism of basalt fiber reinforced asphalt mixture on road performance is further studied from the micro level by scanning electron microscopy, so as to promote the development of drainage asphalt pavement in China
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