作者：郭丽, 李香兰, 王小玲, 李琪

作者单位：江西科技学院城市建设学院，江西 南昌 330098

关键词：再生骨料;聚乙烯醇(PVA)纤维;强度;超声波速;相关性分析;SEM分析

摘要：

为研究聚乙烯醇（PVA）纤维和再生骨料对混凝土基本性能的影响规律，利用再生骨料以0%，25％，50％，75％和100％的比例替代天然骨料，并添加体积分数分别为0.25％，0.5%和1％的聚乙烯醇（PVA）纤维制备混凝土试样，然后进行物理和力学试验。结果表明：随着再生骨料掺量的增加，混凝土的密度、抗压强度和弹性模量均先增后减，而超声波速则单调减。随着聚乙烯醇（PVA）纤维含量的增加，密度和超声波速逐渐降低；抗压强度、抗拉强度和弹性模量逐渐增加；根据结果得再生骨料和聚乙烯醇（PVA）纤维的最优掺量分别为25%~50%和0.5%。相关性分析表明再生骨料混凝土的密度、抗压强、超声波速之间具有一定的线性相关性；SEM分析证明纤维在混凝土内部重叠交错分布，有利于提高混凝土的力学特性。

The influence of PVA and recycled aggregate on the basic properties of concrete
GUO Li, LI Xianglan, WANG Xiaoling, LI Qi
School of Urban Construction, Jiangxi University of Science and Technology, Nanchang 330098, China
Abstract: To study the influence of polyvinyl alcohol (PVA) fiber and recycled aggregates on the basic properties of concrete, natural aggregates were replaced with recycled aggregates in the proportions of 0%, 25%, 50%, 75% and 100%, and polyvinyl alcohol (PVA) fibers were added with volume fractions of 0.25%, 0.5% and 1% to prepare sample, and then physical and mechanical tests were carried out. The results show that with the increase of the recycled aggregate content, the density, compressive strength and elastic modulus of concrete all increase first and then decrease, while the ultrasonic velocity decreases monotonously. With the increase of polyvinyl alcohol (PVA) fiber content, the density and ultrasonic velocity gradually decrease; the compressive strength, tensile strength and elastic modulus gradually increase; according to the results, the optimal content of the recycled aggregate and polyvinyl alcohol (PVA) fiber distribution are 25%-50% and 0.5%. Correlation analysis shows that the density, compressive strength, and ultrasonic velocity of recycled aggregate concrete have a certain linear correlation; SEM analysis proves that the fibers are overlapped and staggered inside the concrete, which is beneficial to improve the mechanical properties of the concrete.
Keywords: recycled aggregate;polyvinyl alcohol (PVA) fiber;strength;ultrasonic velocity;correlation analysis;SEM analysis
2022, 48(11):161-167  收稿日期: 2021-06-04;收到修改稿日期: 2021-09-01
基金项目: 江西省教育厅科学技术研究一般项目（GJJ151163）
作者简介: 郭丽（1987-），女，湖北仙桃市人，讲师，硕士，研究方向为防灾减灾工程
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