摘要
为解决目前桥梁两幅桥面板中部纵缝桥面铺装层易开裂的问题,考虑通过混杂纤维的方式来对ECC(Engineered Cementitious Composite)材料进行抗剪强度方面的改性。将PVA纤维、PP纤维、POM纤维两两混杂(纤维总体积掺量控制为2%,以0.5%体积掺量作为变化梯度)后掺入ECC材料中,以劈裂抗拉强度以及凸型试件剪切强度来评价混杂掺入后ECC材料的抗剪强度。试验结果表明:纤维混杂掺入后,能使ECC材料在劈裂抗拉试验中呈现出多裂缝开裂的状态,且POM纤维与PVA纤维混杂掺入时试件具有较高的初裂强度以及峰值强度,PVA纤维的掺量比例越高,峰值强度越高。在剪切试验中,当试件的剪切强度较高时,试件能够发生剪切面破坏,POM纤维与PVA纤维混杂掺入后材料的剪切强度较高,POM纤维的混杂掺入比例越高,抗剪强度越高。
In order to solve the current bridge two bridge deck plate in the middle of the longitudinal joints of the bridge deck pavement layer easy to crack the problem,consider through the way of mixing fibers to the ECC(Engineered Cementitious Composite)materials for shear strength modification.PVA fibers,PP fibers,POM fibers two and two mixed(total volume of fiber doping control for 2%,to 0.5% volume doping as a gradient of change)after the mixing into the ECC materials,to split tensile strength and convex specimen shear strength to evaluate the shear strength of ECC materials after the mixing and doping.The test results show that the fiber blending and doping can make the ECC material show multi-crack cracking in the split tensile test,and the specimen has high initial cracking strength as well as peak strength when the POM fiber is blended and doped with PVA fiber,and the higher the doping ratio of PVA fiber,the higher the peak strength.In the shear test,when the shear strength of the specimen is higher,the specimen is able to occur shear surface damage,and the shear strength of the material is higher when POM fibers and PVA fibers are mixed and doped,and the higher the proportion of POM fibers mixed and doped,the higher the shear strength.
作者
王传琦
黄庆龙
李苇
王裕滔
丁溢骏
李福海
WANG Chuanqi;HUANG Qinglong;LI Wei;WANG Yutao;DING Yijun;LI Fuhai(Southwest Municipal Engineering Design and Research Institute of China,Chendu 610084,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《混凝土》
北大核心
2025年第10期88-91,98,共5页
Concrete
基金
国家重点研发计划课题(2021YFB2600900)
四川省自然科学基金(2023NSFSC0025)。
