冻融循环后PVA-ECC拉伸性能衰减规律研究

摘要/Abstract

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。

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

Abstract: 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.

Key words: polyvinyl alcohol fiber-reinforced engineered cementitious composite, initial crack strength, tensile strength, tensile strain, strain energy, freezing-thawing cycle, attenuation law, VARMA model

中图分类号:

TU525.9

高秀梅, 刘曙光, 闫敏. 冻融循环后PVA-ECC拉伸性能衰减规律研究[J]. 硅酸盐通报, 2023, 42(3): 837-844.

GAO Xiumei, LIU Shuguang, YAN Min. Attenuation Law of Tensile Property of PVA-ECC after Freezing-Thawing Cycles[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(3): 837-844.

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