基于平板法纤维混凝土早期抗裂性能试验研究  

Experimental Study on Early Cracking Resistance of Fibre Concrete Based on Flat Plate Method

作　　者：周茗如[1,2] 樊乐涛 于景龙[3] 侯红红[1] 

机构地区：[1]兰州理工大学甘肃省土木工程防灾减灾重点实验室,兰州730050 [2]西部土木工程防灾减灾教育部工程研究中心,兰州730050 [3]兰州交通大学土木工程学院,兰州730070

出　　处：《硅酸盐通报》2016年第8期2590-2595,共6页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金项目(51168031);甘肃省建设厅建设科技攻关项目(JK2014-9)

摘　　要：通过平板约束试验研究整体式聚丙烯纤维混凝土、整体式钢纤维混凝土、层布式混杂纤维混凝土、整体式混杂纤维混凝土的早期抗裂性能,并与基准混凝土进行对比研究。结果表明:掺加纤维的混凝土,其早期开裂时间延迟,裂缝条数、最大裂缝宽度、裂缝总长度、单位面积裂缝的数量、总裂缝面积均有不同程度的减小,纤维掺入混凝土中能显著改善混凝土的早期抗裂性能;在纤维掺入的混凝土中,纤维掺入方式不同,混凝土抗裂效果也不同。经对比分析,混杂纤维混凝土的抗裂性能要优于单掺纤维混凝土;层布式混杂纤维混凝土的抗裂效果要好于整体式混杂纤维混凝土。Early cracking resistance of integral polypropylene fiber concrete,integral steel-fiber concrete, layer hybrid fiber reinforced concrete, and integral hybrid fiber reinforced concrete were studied by flat- restraint test,and compared to that of the plain concrete. The results show that early cracking time of concrete mixed with fiber was delayed, the maximum crack width, total length number of cracks per unit area, and total crack area were decreased in different degrees. Thus, the early anti-cracking capability of concrete can be significantly improved by the incorporation of fiber. In the concrete with the fiber, the different mixing ways of the fiber result in different crack resistance effect. Through contrasting and analyzing, the anti-cracking performance of hybrid fiber reinforced concrete is obviously superior to that of reinforced concrete with a kind of the fiber, the anti-cracking effect of layer hybrid fiber reinforced concrete is superior to that of integral hybrid fiber reinforced concrete.

关 键 词：纤维混凝土 早期开裂 混杂纤维 混凝土抗裂性能 

分 类 号：TU528[建筑科学—建筑技术科学]