硫酸盐-冻融循环下自感应水泥砂浆的耐久及压敏性能

摘要/Abstract

摘要： 为提升寒冷地区建筑结构的实时损伤监测效果,研究了硫酸盐-冻融循环作用下采用短切碳纤维与铁尾矿作为导电材料制备的自感应水泥砂浆的耐久与压敏性能。利用质量损失、相对动弹性模量及抗压强度损失为依据探讨耐久性能变化规律,以电阻率变化率-压应力的相关关系反映硫酸盐-冻融循环作用下压敏性能发展规律并解释其导电机理,并采用平均应力敏感系数评价硫酸盐-冻融循环作用下压敏性能稳定性。结果表明,碳纤维体积掺量为0.4%、铁尾矿替代率为30%(质量分数)组合掺入水泥砂浆时,其耐久性能与压敏性能均达到较高水平,但硫酸盐-冻融循环造成的孔洞与裂缝会导致铁尾矿碳纤维水泥砂浆电阻率变化率-压应力呈一阶指数衰减关系,可采用Plane模型来反映平均应力敏感系数衰减程度与冻融循环次数、铁尾矿替代率之间良好的相关关系。

关键词: 铁尾矿, 短切碳纤维, 硫酸盐-冻融循环, 压敏性能, 应力敏感系数, Plane模型

Abstract: To improve the real-time damage monitoring effect of building structures in cold regions, the durability and piezoresistivity of self-sensing cement mortar prepared by using chopped carbon fiber and iron tailings as conductive materials under the sulfate freeze-thaw cycles were studied. Based on the mass loss, relative dynamic elastic modulus and compressive strength loss, the change law of durability performance was studied, the correlation between fractional change in resistivity and compressive stress was used to reflect the development law of piezoresistivity under the sulfate freeze-thaw cycles and the conduction mechanism was explained, the average stress sensitivity coefficient was used to evaluate the stability of piezoresistivity under the sulfate freeze-thaw cycles. The results show that cement mortar combined with 0.4% volume of carbon fiber and 30% (mass fraction) replacement rate of iron tailings reach a better level of durability and piezoresistivity. The fractional change in resistivity-compressive stress shows a first-order exponential decay relationship due to the holes and cracks caused by sulfate freeze-thaw cycles. The Plane model can be used to reflect the good correlation among the attenuation degree of average stress sensitivity coefficient and the number of freeze-thaw cycles and the replacement rate of iron tailings.

Key words: iron tailings, chopped carbon fiber, sulfate freeze-thaw cycle, piezoresistivity, stress sensitivity coefficient, Plane model

中图分类号:

TU528

李一凡, 王社良, 徐晋, 白娇娇, 全晓旖, 徐卫锋. 硫酸盐-冻融循环下自感应水泥砂浆的耐久及压敏性能[J]. 硅酸盐通报, 2022, 41(3): 777-786.

LI Yifan, WANG Sheliang, XU Jin, BAI Jiaojiao, QUAN Xiaoyi, XU Weifeng. Durability and Piezoresistivity of Self-Sensing Cement Mortar under Sulfate Freeze-Thaw Cycles[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(3): 777-786.

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