钢渣粉/聚酯纤维沥青混合料水稳定性研究

为了实现钢渣粉在沥青路面中的可持续利用,同时结合河南省冬季冰雪天气下路面的除冰情况,本文研究掺有聚酯纤维与钢渣粉沥青混合料的水稳定性。制备4种聚酯纤维掺量(0%、0.3%、0.4%、0.5%)AC-13沥青混合料开展复盐(掺量配比为NaCl：CaCl2：CH2COONa=1：1：2)冻融循环劈裂试验,结果表明聚酯纤维掺量为0.4%时,沥青混合料水稳定最好；在最佳纤维掺量下制备5种替代率(0%、25%、50%、75%、100%)钢渣粉沥青混合料,采用冻融劈裂抗拉强度比(TSR)确定最佳钢渣粉替代率为75%,混合料水稳定性最佳；通过冻融腐蚀因子K评价沥青混合料的抗侵蚀性能,结果表明：聚酯纤维/钢渣粉沥青混合料的抗侵蚀性能最强,聚酯纤维沥青混合料次之,普通石灰岩沥青混合料最弱。通过电镜扫描(SEM)、X射线衍射(XRD)技术探索钢渣粉/聚酯纤维沥青混合料界面粘附作用的改性机理。微观分析表明：掺量为0.4%的聚酯纤维形成的纤维网状结构以及沥青、钢渣粉(75%的替代率)和矿粉三者存在界面能量作用可以很好地改善沥青混合料的水稳定性。

Effect of Erosion on Water Stability of Permeable Fiber Asphalt Mixture

: To realize the sustainable utilization of steel slag powder in asphalt pavement, combined with the deicing situation of Henan Province in winter snow and ice weather, this paper studied the water stability of asphalt mixture mixed with polyester fiber and steel slag powder. Four kinds of polyester fiber mixtures (0%, 0.3%, 0.4%, 0.5%) AC-13 asphalt mixture were prepared to carry out the freeze-thaw splitting test of mixed salt (NaCl: CaCl2: CH2COONa = 1:1:2). The results showed that the asphalt mixture had the best water stability when the polyester fiber content was 0.4%.SFive kinds of steel slag powder asphalt mixtures with substitution rates (0%, 25%, 50%, 75%, 100%) were prepared under the optimal fiber content. The optimal steel slag powder substitution rate was determined as 75% by the splitting tensile strength ratio (TSR), and the water stability of the mixture was the best.SThe anti-erosion performance of asphalt mixtures was evaluated by freeze-thaw corrosion factor K. The results showed that the anti-erosion performance of polyester fiber/steel slag powder asphalt mixture was the strongest, followed by fiber asphalt mixture, and the common limestone asphalt mixture was the weakest.SScanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to explore the modification mechanism of interface adhesion between steel slag powder and polyester fiber asphalt mixture. Microanalysis shows that the fiber network structure of the polyester fiber, and the interaction of interfacial energy among asphalt, steel slag powder and mineral powder (75% substitution rate), can improve the water stability of asphalt mixture well.