不同沥青体分比环氧树脂沥青混合料的断裂性能  

Fracture Performances of Epoxy Resin Asphalt Mixes with Different Asphalt Volume Fractions

作　　者：闵召辉[1] 张占军[1,2] 黄卫[1] 

机构地区：[1]东南大学智能运输系统研究中心,江苏南京210096 [2]北京路桥中咨科技有限公司,北京100176

出　　处：《中国公路学报》2011年第3期22-28,共7页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(50878053);"十一五"国家科技支撑计划项目(2009BAG151303)

摘　　要：采用0.250、0.400、0.500、0.571四种不同沥青体分比的环氧树脂沥青及AH-70普通沥青、SBS改性沥青制成混合料试件模型,进行-25℃、-15℃、-5℃和5℃温度下的半圆形直裂缝试件三点弯曲对比试验,并通过扫描电镜进行环氧树脂沥青固化物微观结构形态分析。研究结果表明:3种沥青混合料的断裂性能与锯缝深度关系呈现相同的趋势;沥青体分比大于0.400时,环氧树脂沥青混合料断裂性能随着沥青体分比的提高而大幅度降低,但均高于AH-70普通沥青混合料;SBS改性沥青混合料的断裂性能基本与沥青体分比为0.500的环氧树脂沥青混合料相当;沥青体分比为0.571时,环氧树脂沥青混合料断裂性能与温度的关系表现和AH-70普通沥青混合料相似;扫描电镜及断裂机理分析显示,环氧树脂沥青的相逆转临界沥青体分比为0.500。Using AH-70 conventional asphalt,SBS modified asphalt,epoxy resin asphalt with four kinds of asphalt volume fractions,i.e.0.250,0.400,0.500 and 0.571,mix specimen model was made,three-point bending contrast tests with the notched semi-circular specimens were performed under-25 ℃,-15 ℃,-5 ℃ and 5 ℃.Micro-structure analyses of phase of epoxy resin asphalt were observed by scanning electron microscope（SEM）.Test results show that the variations of fracture performances with notch depths of epoxy resin asphalt mixes are consistent with those of AH-70 conventional asphalt mixes and SBS modified asphalt mixes.The fracture performances of epoxy resin asphalt mixes which exceed the AH-70 conventional asphalt mixes obviously decrease with the increase of asphalt volume fraction when the asphalt volume fraction surpasses 0.400.The fracture performance of SBS modified asphalt mixes is similar to that of the epoxy resin asphalt mixes with the asphalt volume fraction of 0.500.Relations between fracture performances and temperatures exist similar tendency for epoxy resin asphalt mixes and AH-70 conventional asphalt mixes with the asphalt volume fraction of 0.571.SEM photos and fracture mechanism analysis show that the critical asphalt volume fraction of epoxy resin asphalt is 0.500.

关 键 词：道路工程 环氧树脂沥青 试验研究 体分比 

分 类 号：U414.1[交通运输工程—道路与铁道工程]