孔隙率对沥青混合料水稳定性影响研究.pdf

第39卷,第5期
公路工程
Vol 39. No 5
2014年10月
ighway Engineering
0ct.,2014
孔隙率对沥青混合料水稳定性影响研究
吴渝玲
(重庆水利电力职业技术学院,重庆400074
摘要]沥青混凝土路面水敏感性一直为路面工程界所重视的重要向题。影响沥青混凝土水敏感性的因子
有很多,包括材料性质、沥青混合料性质、施工质量及交通与环境条件。水的扩散及沥青混合料空隙率为重要影响
因素。许多实验室以不同试验方法评估沥青混凝土水侵害的行为,较常用试验方法包括煮沸试验、马歇尔抗拉强
度试验、浸没试验、修正 Lottman试验等。以上这些试验方法简单操作,而其有效性仍无法提供沥青混凝土水侵害
破坏的机制。研究目的是在实验室分别制作8%及11%空隙率的密级配沥青混凝土试件,并施予70%~80%饱和
度,进行动态模量试验及获得动态模量主曲线,再以相同试件进行力学试验获得疲劳破坏圈数,借以了解沥青混凝
土孔隙率对动态模量及疲劳破坏的影响,并探讨在不同空隙率下沥青混凝土的水敏感性。试验结果表明,空隙率
与水饱和越小,模量衰减程度较大,表示应力松弛较快,抗裂性较佳,水敏感性较佳;反之模量衰减程度较小表示应
力松弛较慢,较容易产生开裂,水敏感性较差。
[关键词]道路工程;水稳定性;动态模量;疲劳破坏
[中图分类号]U414.1[文献标识码]A
文章编号]1674-0610(2014)05-0266-04
Porosity of the Asphalt Mixture Water Stability Impact Study
YU Yulin
g
(Chongging Water Power Vocational Technology College, Chongqing 400074, China
Abstract]Water sensitivity of asphalt concrete for road engineering is the emphasis on the impor
tant issues. On asphalt concrete water sensitivity factor are many, including the properties of material
properties, asphalt mixture, construction quality and transportation and environmental conditions. The
diffusion of water and air void of asphalt mixture as the important influence factors. Many laboratories in
different test method for evaluation of asphalt concrete water enroach on, commonly used test methods in
cluding the boiling test, tensile strength test and immersion Marshall test, fixed Lottman test, etc. This
test method is simple operation, and its effectiveness is still unable to provide the asphalt concrete water
damage mechanism. The purpose of this study is 8% and 11% respectively in the laboratory making void
fraction of dense gradation asphalt concrete specimens, 70%80%and giving saturation, dynamic mod
ulus test and get a dynamic modulus master curve, again with the same specimen for fatigue damage me
chanics experiment laps, so as to understand the porosity on the dynamic modulus of asphalt concrete and
the influence of fatigue damage, and discusses on air voids of asphalt concrete under different water sen
sitivity. Test results clearly show that the smaller the porosity and water saturation, the modulus attenua
tion degree is bigger, said stress relaxation faster, better crack resistance, water sensitivity is better; And
modulus decay less stress relaxation slower, more easy to produce craze, water sensitivity Is poor.
I Key words water sensitivity; the dynamic modulus; fatigue damage
0前言
路面时,路面材料的力学性质即开始退化而降低路
面的服务品质。因此沥青混凝土水损坏可以定义为
在沥青混凝土路面有许多主要的破坏是由于水沥青材料由于水的作用导致力学性质下降。影响沥
的引入而激发或增长路面破坏。当水或水汽呈现在青混凝土水敏感性的因子有很多,包括材料性质、沥
[收稿日期12014-05-04
[作者简介]?渝玲(1982-),女,四川遂宁人,讲师,从事土木建筑材料教学与研究工作。