冻融循环后PVA-ECC拉伸性能衰减规律研究  

Attenuation Law of Tensile Property of PVA-ECC after Freezing-Thawing Cycles

作　　者：高秀梅 刘曙光 闫敏 GAO Xiumei;LIU Shuguang;YAN Min(School of Civil Engineering,Inner Mongolia University of Technology,Hohhot 010000,China;School of Mining Technology,Inner Mongolia University of Technology,Hohhot 010000,China;Department of Civil Engineering,Ordos Institute of Technology,Ordos 017000,China)

机构地区：[1]内蒙古工业大学土木工程学院,呼和浩特010000 [2]内蒙古工业大学矿业学院,呼和浩特010000 [3]鄂尔多斯应用技术学院土木工程系,鄂尔多斯017000

出　　处：《硅酸盐通报》2023年第3期837-844,共8页Bulletin of the Chinese Ceramic Society

基　　金：内蒙古自然科学基金(2020MS05016)。

摘　　要：为研究聚乙烯醇纤维水泥基复合材料(PVA-ECC)冻融后的拉伸性能,分别对PVA-ECC试件冻融0、25、50、75、100、125、150次后进行拉伸试验,通过试件表面特征和拉伸特征参数综合评价PVA-ECC冻融后的拉伸性能,并采用向量自回归滑动平均(VARMA)模型探索冻融循环后拉伸特征参数之间的规律。结果表明,冻融循环试验后,试件均出现不同程度的损伤,损伤程度随冻融循环次数增加逐渐增大。初裂强度与抗拉强度随冻融循环次数的增加逐渐降低,拉伸应变与应变能随冻融循环次数的增加呈先升高后降低的趋势。基于试验数据建立了拉伸特征参数的关系式,进一步揭示了冻融循环后拉伸特征参数的衰减规律。In order to study the tensile property of polyvinyl alcohol fiber-reinforced engineered cementitious composite(PVA-ECC)after freezing-thawing cycles,the tensile tests were carried out on PVA-ECC specimens with 0,25,50,75,100,125,150 freezing-thawing cycles.The tensile property of PVA-ECC after different freezing-thawing cycles was comprehensively evaluated by surface characteristic and tensile characteristic parameter.In addition,the vector autoregressive moving average(VARMA)model was used to explore the law of tensile characteristic parameter after freezing-thawing cycles.The results show that after freezing-thawing cycles,the specimens are all damaged to varying degrees,and the damage degree gradually increases with the increase of freezing-thawing cycles.The initial crack strength and tensile strength become smaller with the increase of freezing-thawing cycles,and the tensile strain and strain energy increase first and then decrease with the increase of freezing-thawing cycles.Based on the experimental data,some formulas relating to tensile characteristic parameter are proposed,which further reveal the attenuation law of tensile characteristic parameter after freezing-thawing cycles.

关 键 词：聚乙烯醇纤维水泥基复合材料 初裂强度 抗拉强度 拉伸应变 应变能 冻融循环 衰减规律 VARMA模型 

分 类 号：TU525.9[建筑科学—建筑技术科学]