聚甲醛纤维超高强混凝土断裂性能研究  

Research on Fracture Properties of Ultra-High Strength Concrete with Polyformaldehyde Fibers

作　　者：夏旸昊 杨鼎宜[1,2] 高函 郭子荣 钱云峰 XIA Yanghao;YANG Dingyi;GAO Han;GUO Zirong;QIAN Yunfeng(College of Civil Science and Engineering,Yangzhou University,Yangzhou 225127,China;Research Institute of Green Building Materials,Yangzhou University,Yangzhou 225127,China)

机构地区：[1]扬州大学建筑科学与工程学院,江苏扬州225127 [2]扬州大学绿色建筑材料研究所,江苏扬州225127

出　　处：《工业建筑》2022年第12期179-185,共7页Industrial Construction

基　　金：国家重点研发计划项目(2018YFD1101002);江苏省2021年研究生实践创新计划项目(SJCX21_1580)。

摘　　要：为探究聚甲醛(POM)纤维对超高强混凝土(UHSC)断裂性能的影响,采用三点弯曲梁法进行断裂试验,研究不同纤维长度和体积掺量对UHSC起裂韧度、失稳韧度、断裂能和延性指数等断裂参数的影响。试验结果表明:POM纤维的掺入可以改善UHSC的断裂性能,随着纤维体积掺量、纤维长度的增加,荷载-裂缝张开口位移(P-δ_(CMOD))曲线的下降段更加饱满;当纤维长度为12 mm,纤维掺量为1.5%时,对起裂韧度提升最为显著;当纤维长度为20 mm,纤维掺量为1.5%时,试件的失稳韧度、断裂能和延性指数达到最大。To explore the influence of polyformaldehyde(POM) fibers on the fracture properties of ultra-high strength concrete(UHSC), the three-point bending beam method was used for fracture test, the influence of fiber length and fiber volume content on the UHSC crack toughness, instability of toughness, fracture energy and ductility indexes was studied. The experimental results showed that the addition of POM fibers could improve the fracture properties of UHSC. With the increase of fiber volume content and fiber length, the descending segment of P-δ_(CMOD)curve became fuller. When the fiber length was 12 mm and fiber content was 1.5%, the crack initiation toughness was improved most significantly. When the fiber length was 20 mm and the fiber content was 1.5%, the specimens’ instability toughness, fracture energy and ductility indexes reached the maximum.

关 键 词：聚甲醛纤维 超高强混凝土 断裂韧度 断裂能 延性指数 

分 类 号：TU528.572[建筑科学—建筑技术科学]