高强高韧机敏混凝土的制备及其性能  

Preparation and performance of smart high strength and high ductile concrete

作　　者：刘金涛 洪宇超 周煜 王伟胜 孔德玉[1,2] LIU Jintao;HONG Yuchao;ZHOU Yu;WANG Weisheng;KONG Deyu(College of Civil Engineering,Zhejiang University of Technology,Hangzhou 310023,China;Zhejiang Key Laboratory of Engineering Structure and Disaster Prevention and Mitigation Technology,Hangzhou 310023,China)

机构地区：[1]浙江工业大学土木工程学院,杭州310023 [2]浙江省工程结构与防灾减灾技术研究重点实验室,杭州310023

出　　处：《复合材料学报》2024年第12期6628-6638,共11页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金项目(52379136);水利部水工程材料重点实验室(筹)开放研究基金项目(EMF202414)。

摘　　要：研究通过混杂碳纤维(Carbon fiber,CF)和聚乙烯纤维(Polyethylene fiber,PE)制备出高强高韧性混凝土(High strength and high ductility concrete,HSHDC),并对其力学性能及机敏性特性进行了分析。研究表明0.25vol%CF掺量HSHDC的抗压强度较对照组提升7%、抗折强度增加13%、拉伸应变提高15.2%。HSHDC的电阻率值随CF掺量增加而显著降低,1.0vol%CF掺量HSHDC的电阻率值下降至10Ω·m,较对照组降低3个数量级。在不同温度与相对含水率下,掺有CF的HSHDC电阻率表现出较好的稳定性,循环荷载作用下0.25vol%CF掺量HSHDC电阻率变化率与应力之间表现出良好的对应关系,压应力和压应变灵敏系数分别达到0.75%/MPa和136.5。0.25vol%CF掺量的HSHDC在加载幅度为15 MPa时的最大电阻率变化率为9.2%,加载速度为0.4 mm/min时峰值电阻率变化率达到7.9%。In this study,high strength and high ductility concrete(HSHDC) was developed by mixing carbon fiber(CF) and polyethylene fiber(PE).The mechanical properties and agility of HSHDC were analyzed.The results show that the compressive strength,flexural strength and tensile strain of HSHDC with 0.25vol%CF content were 7%,13%,and 15.2% higher than those of control group,respectively.The resistivity of HSHDC decreases significantly with the increase of CF content,and the resistivity of HSHDC with 1.0vol%CF content was as low as 10 Ω·m,which was three orders of magnitude lower than that of the control group.With different temperature and relatively humidity conditions,the resistivity of HSHDC mixed with CF showed good stability.Under cyclic loading,the resistivity change rate of HSHDC with 0.25vol%CF content showed a good correspondence with the stress,and the compressive stress and compressive strain sensitivity coefficients reached 0.75%/MPa and 136.5,respectively.For HSHDC with0.25vol%CF content,the maximum resistivity change rate was 9.2% when the loading amplitude was 15 MPa,and the peak resistivity change rate was 7.9% when the loading speed was 0.4 mm/min.

关 键 词：混杂纤维 高韧性混凝土 力学性能 温敏性能 湿敏性能 压敏性能 

分 类 号：TB332[一般工业技术—材料科学与工程]