沥青改性剂在混凝土路面加固施工中的应用

杜凤

摘 要：为提升沥青混凝土路面施工质量，研究沥青改性剂在混凝土路面加固施工中的应用。以某高速公路为例，选取70#基质沥青为原料，添加不同掺量的Sasobit和SBS沥青改性剂，制作改性沥青和改性沥青混合料。选取针入度、延度、软化点、高温稳定性能、低温抗裂性能和水稳定性为测试指标，验证不同Sasobit和SBS沥青改性剂掺量下改性沥青的性能。实验结果表明：掺入Sasobit和SBS改性剂后，改性沥青在15℃、25℃、30℃温度范围内的硬度增加，抗变形能力变强;温度敏感性降低;高温抗变形能力增强;改性沥青混合料强度、极限应变和变形能力增强;抗车辙能力、低温抗裂性、水稳定性提升。Sasobit沥青改性剂在针入度降低方面和马歇尔稳定度提升方面优势显著;SBS沥青改性剂在改善延度、提升路面高温性能、动稳定度和低温抗裂性方面优势显著。

关键词：沥青;改性剂;混凝土;路面加固施工;改性沥青

中图分类号：U416 文献标识码：A 文章编号：1001-5922（2021）08-0187-06

Application of Asphalt Modifier in Concrete Pavement Reinforcement Construction

Du Feng

（Sichuan Vocational and Technical College of Communications， Chengdu 611130， China）

Abstract：In order to improve the construction quality of asphalt concrete pavement， the application of asphalt modifier in concrete pavement reinforcement construction is studied. Taking an expressway as an example， 70# base asphalt was selected as raw material， and Sasobit and SBS asphalt modifier with different contents were added to produce modified asphalt and modified asphalt mixture. Penetration， ductility， softening point， high temperature stability， low temperature cracking resistance and water stability were selected as test indexes to verify the performance of modified asphalt with different Sasobit and SBS modifier contents. The experimental results show that： with the addition of Sasobit and SBS modifier， the hardness of modified asphalt in the temperature range of 15℃， 25℃ and 30℃ increases， and the deformation resistance increases; the temperature sensitivity decreases; the high temperature deformation resistance increases; the strength， ultimate strain and deformation energy of the modified asphalt mixture are enhanced; the rutting resistance， low temperature crack resistance and water stability are improved. Sasobit asphalt modifier has significant advantages in penetration reduction and Marshall stability improvement; SBS asphalt modifier has significant advantages in improving ductility， improving pavement high temperature performance， dynamic stability and low temperature crack resistance.

Key words：Asphalt; Modifier; Concrete; Pavement reinforcement construction; Modified asphalt

0 引言

瀝青混凝土路面出现重载、超载现象越发的明显[1]，加上受气候因素的影响，沥青混凝土路面的车辙、开裂状况不断发生，汽车行驶在这种路面情况较差的沥青混凝土公路上，会出现颠簸现象，导致车内人员的舒适度降低;严重时甚至会出现交通事故，造成生命危机[2，3]。因此，提升沥青混凝土路面施工质量是保障人们行驶过程中舒适度和安全性的前提。

目前在沥青混凝土路面加固工程中，一般采用添加沥青改性剂提高沥青混凝土路面的使……