细集料特性对GAC-16沥青混合料技术性能的影响

doi:10.3969/j.issn.1674-0696.2022.08.16

摘要/Abstract

摘要： 为了研究细集料特性对GAC-16沥青混合料技术性能的影响，对石灰岩和辉绿岩两种细集料进行了扫描电镜(SEM)、吸柱试验和水煮试验来分析两种细集料的特性。对两种细集料在3种配制方案下成型的GAC-16沥青混合料试件进行了高低温性能、水稳定性和疲劳性能评价；分析了3种GAC-16沥青混合料动态模量在不同加载频率下的变化规律，并依据时-温等效原理和非线性最小二乘法拟合得到3种GAC-16混合料动态模量主曲线；从而全面分析了不同细集料特性对GAC-16混合料技术性能的影响。研究结果表明：辉绿岩细集料具有比石灰岩更高的表面粗糙度和表面自由能，但抗水煮剥落性较差；相较于石灰岩，采用辉绿岩细集料的GAC-16混合料的高温抗车辙性能较好，但同时疲劳寿命和低温抗裂性也较差；这两种细集料对GAC-16混合料的水稳定性能几乎无影响；细集料对GAC-16混合料动态模量具有一定影响，在低频(高温)条件下，辉绿岩细集料制备的GAC-16沥青混合料抗变形能力出现明显的衰减。综合水煮试验、车辙试验以及动态模量试验结果来看，初步认为辉绿岩细集料制备的GAC-16混合料在高温条件下有较高的温度变化敏感性。

关键词: 道路工程；细集料特性；GAC-16沥青混合料；技术性能；动态模量；表面自由能

Abstract: In order to study the influence of fine aggregate properties on the technical performance of GAC-16 asphalt mixture, scanning electron microscope (SEM), suction column test and boiling test were used to analyze the properties of two types of fine aggregates including limestone and diabase. The high and low temperature performance, water stability and fatigue performance of GAC-16 asphalt mixture specimens formed by two kinds of fine aggregates under three preparation schemes were evaluated. The variation rule of dynamic modulus of three types of GAC-16 asphalt mixture at different loading frequencies was analyzed, and the dynamic modulus master curves of three types of GAC-16 mixture were fitted according to the time-temperature equivalent principle and nonlinear least square method. Thus, the influence of different fine aggregate properties on the technical performance of GAC-16 mixture was comprehensively analyzed. The research results show that diabase fine aggregate has higher surface roughness and surface free energy than limestone does, but it has poor resistance to boiling and peeling. Compared with limestone fine aggregate, the GAC-16 asphalt mixture with diabase fine aggregate has great high-temperature rutting resistance, but also has poor fatigue life and low-temperature cracking resistance. And there is little effect of the two fine aggregates on the water stability of GAC-16 mixture. Fine aggregate has some influence on the dynamic modulus of GAC-16 mixture, and the deformation resistance of GAC-16 asphalt mixture with diabase fine aggregate decreases significantly under low frequency (high temperature) conditions. Based on the results of boiling test, rutting test and dynamic modulus test, it is preliminarily concluded that the GAC-16 mixture prepared from diabase fine aggregate has higher temperature sensitivity under high temperature conditions.

Key words: highway engineering; fine aggregate properties; GAC-16 asphalt mixture; technical performance; dynamic modulus; surface free energy

中图分类号:

U414

杨军1，唐胜刚1，许新权1,2. 细集料特性对GAC-16沥青混合料技术性能的影响[J]. 重庆交通大学学报（自然科学版）, 2022, 41(08): 112-119.

YANG Jun1, TANG Shengang1, XU Xinquan1,2. Influence of Fine Aggregate Properties on the Technical Performance of GAC-16 Asphalt Mixture[J]. Journal of Chongqing Jiaotong University(Natural Science), 2022, 41(08): 112-119.

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