RTP-PVA混杂纤维的工程水泥基复合材料干缩性能试验研究
Test Study on Drying Shrinkage Properties of Engineered Cementitious Composites with RTP-PVA Hybrid Fibre
陈猛 1洪宇1
作者信息
- 1. 东北大学 资源与土木工程学院,辽宁 沈阳 110819
- 折叠
摘要
为研究回收轮胎聚合物(recycled tyre polymer,RTP)和聚乙烯醇(polyvinyl alcohol,PVA)混杂纤维对工程水泥基复合材料(engineered cementitious composites,ECC)干缩性能的影响,对RTP-PVA混杂纤维总体积分数为2.0%的ECC进行流动性、直接拉伸和干缩试验,并分析混杂纤维作用机理和干缩计算模型.结果表明:RTP纤维替代率为12.5%～50%对ECC流动性影响不大,比单掺PVA纤维的ECC流动性降低1.09%～3.69%.ECC的抗拉强度随RTP纤维替代率的增加而降低,不同比例的混杂纤维比单掺PVA纤维的ECC抗拉强度降低了23.6%～56.6%.不同比例混杂纤维ECC干缩率曲线趋势相近,7 d时干缩率为28 d时的80.92%～82.77%.ECC的干缩率随RTP纤维替代率的增加而降低,28 d时不同RTP纤维替代率的混杂纤维比单掺PVA纤维的ECC干缩率降低了0.80%～2.09%.RTP-PVA混杂纤维可在ECC中协同发挥作用抑制基体干缩,结合试验结果得到适合RTP-PVA混杂纤维ECC的指数型干缩预测模型.
Abstract
In order to study the effect of recycled tyre polymer(RTP)and polyvinyl alcohol(PVA)hybrid fibres on the dry-shrinkage properties of engineered cementitious composite(ECC),the fluidity,direct tension and dry-shrinkage tests of RTP-PVA hybrid fibre reinforced ECC with a total volume fraction of 2.0%were carried out,and the mechanism and dry-shrinkage calculation model of hybrid fibres were analyzed.The results show that RTP fibres replacement ratio of 12.5%～50%has minimal effect on the ECC fluidity,which is 1.09%～3.69%lower than that of single doped PVA fibres.The tensile strength of ECC decreases with the increase of RTP fibres replacement ratio to PVA fibres,the tensile strength of ECC with different proportions of hybrid fibres is 23.6%to 56.6%lower compared with that of single PVA fibres.The drying shrinkage rate curves of ECC with different proportions of hybrid fibres exhibit similar trends,and the drying shrinkage rate at 7 d is 80.92%～82.77%of that at 28 d.The drying shrinkage rate of ECC decreased with the increase of RTP fibres replacement ratio to PVA fibres,and the drying shrinkage rate of ECC with different proportions of hybrid fibres decreased by 0.80%to 2.09%compared with that of single PVA fibres at 28 d.RTP-PVA hybrid fibres can play a synergistic role in inhibiting drying shrinkage of ECC.Combined with the experimental results,an index drying shrinkage prediction model suitable for RTP-PVA hybrid fibre ECC is proposed.
关键词
回收轮胎聚合物纤维/聚乙烯醇纤维/工程水泥基复合材料/干缩/预测模型Key words
recycled tyre polymer(RTP)fibre/polyvinyl alcohol(PVA)fibre/engineered cementitious composites(ECC)/drying shrinkage/prediction model引用本文复制引用
基金项目
国家自然科学基金(52178382)
中央高校基本科研业务费专项(N2201023)
辽宁省自然科学基金(2020-MS-089)
出版年
2024
NETL
NSTL
维普
万方数据