摘要
为探究纳米SiO_(2)对沥青性能的影响,制备了不同纳米SiO_(2)掺杂量的改性沥青混合料。通过车辙试验、浸水马歇尔试验、冻融劈裂测试和低温抗裂测试对纳米SiO_(2)改性沥青混合料的性能进行了表征。结果表明,5%(质量分数)掺杂量纳米SiO_(2)的改性沥青针入度最低,具有较高的软化点和粘度。与基质沥青相比,5%(质量分数)纳米SiO_(2)改性沥青混合料在45和60 min的车辙深度分别降低了45.90%和52.27%,动稳定度提高了60.57%,浸水48 h后残留稳定度高达90.69%,冻融劈裂强度比达到91.24%,抗弯拉强度提高了17.70%,最大弯拉应变提高了11.36%,弯曲劲度模量提高了8.86%。综合来看,5%(质量分数)纳米SiO_(2)改性沥青混合料的高温性能、水稳定性和低温抗裂性均得到了显著提高,具有良好的路用性能和应用前景。
In order to explore the effect of nano-SiO_(2) on asphalt properties,modified asphalt mixtures with different nano-SiO_(2) doping contents were prepared.The properties of nano-SiO_(2) modified asphalt mixtures were characterized by rutting test,water immersion Marshall test,freeze-thaw splitting test and low temperature cracking resistance test.The results show that the modified asphalt with 5wt%doping content of nano-SiO_(2) has the lowest penetration and higher softening point and viscosity.Compared with the base asphalt,the rutting depth of 5%(mass fraction)nano-SiO_(2) modified asphalt mixture was reduced by 45.90%and 52.27%at 45 and 60 min,respectively,the dynamic stability was improved by 60.57%,and the residue was stable after immersion in water for 48 h.The tensile strength is up to 90.69%,the freeze-thaw splitting strength ratio is up to 91.24%,the flexural tensile strength is increased by 17.70%,the maximum flexural tensile strain is increased by 11.36%,and the bending stiffness modulus is increased by 8.86%.On the whole,the high temperature performance,water stability and low temperature crack resistance of 5wt%nano-SiO_(2) modified asphalt mixture have been significantly improved,and it has good road performance and application prospects.
作者
锁利军
SUO Lijun(Civil Engineering Department, Shanxi Institute of Technology, Yangquan 045000, China)
出处
《功能材料》
CAS
CSCD
北大核心
2022年第5期5199-5204,共6页
Journal of Functional Materials
基金
河南省科技攻关项目(102102310271)
2021年度山西省高等学校科技创新项目(2021L594)。
关键词
纳米SiO_(2)
改性沥青
高温性能
水稳定性
低温抗裂性
nano-SiO_(2)
modified asphalt
high temperature performance
water stability
low temperature crack resistance
