基于断裂能纤维增强乳化沥青碎石封层的抗裂性能  

Crack resistance of fiber-reinforced emulsion asphalt crushed stone seal based on fracture energy

作　　者：刘燕燕[1] 凌天清[1] 蒋科[2] 

机构地区：[1]重庆交通大学土木建筑学院,重庆400074 [2]招商局重庆交通科研设计院有限公司,重庆400067

出　　处：《长安大学学报（自然科学版）》2012年第5期12-17,共6页Journal of Chang’an University(Natural Science Edition)

基　　金：江苏省交通厅交通科学研究计划项目(2010C02)

摘　　要：为了确定纤维增强乳化沥青碎石封层中最佳纤维品种与用量,以及纤维的加入对封层材料抗裂性能的影响,分别测定4种纤维(A-玄武岩纤维,B-无碱玻璃纤维,C-高强玻璃纤维,D-表面处理玻璃纤维)与乳化沥青在破乳前后以及不同温度下的接触角,分析正交试验3因数4水平下,各试验方案的最大弯曲力、最大挠度和断裂能。试验结果表明:随着温度升高,沥青与纤维粘附功逐渐降低,4种纤维粘附功大小为D>B>A>C,在封层中选择D纤维更合适;沥青含量是影响最大弯曲力和断裂能的最主要因素,其次是纤维用量,最后是纤维长度;从能量角度来看,纤维增强乳化沥青碎石封层的最佳组合方案为沥青用量1.2kg/m2、纤维用量160g/m2、纤维长度12cm;加入纤维后乳化沥青碎石封层复合结构试件的最大弯曲力增加了53%,最大挠度增加了98.7%,断裂能增加了159.1%;裂缝在试件中发展到1、3、5cm时,断裂时间分别延长了37.5、39.5、269s。In order to determine the best fiber and its amount in fiber-reinforced emulsion asphalt crushed stone seal,and the impact of the fiber on crack resistance of seal coat materials,the contact angle between four kinds of fiber（A-basalt fiber,B-alkali-free glass fiber,C-high-strength fiber,D-surface treated fiber）and emulsion asphalt before and after demulsification and in different temperatures were measured,and the maximum bending force,the maximum deflection,the fracture energy were analyzed with the orthogonal test under 3 factors and 4 levels.Test results show that the adhesion of emulsion asphalt and fiber decreases with the increase of temperature,the adhesion is D B A C,and the D fiber is more appropriate.The asphalt content is the most important factor to influence bending strength and fracture energy,followed by the amount of fiber,finally the fiber length.From the energy point,the optimum combination scheme for the asphalt content is 1.2 kg/m2,for fiber content 160 g/m2,and for fiber length 12 cm.The maximum bending force of the compound structure specimen increases by 53%,the maximum deflection increases by 98.7%,and the fracture energy increases by 159.1% after adding the glass fiber in fiber-reinforced emulsion asphalt crushed stone seal.The cracks in specimen develop to 1,3,5 cm,and the time extends to 37.5,39.5,269 s respectively.

关 键 词：道路工程 封层 断裂能 正交分析 

分 类 号：U416.217[交通运输工程—道路与铁道工程]