再生细骨料对高延性水泥基复合材料力学性能及碳化耐久性的影响

Effect of Recycled Fine Aggregate on Mechanical Properties and Carbonation Durability of High Ductility Cementitious Composites

吴寅佳 ¹王新杰 ¹朱平华 ¹孙伟豪 ¹熊磊²

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作者信息

1. 常州大学城市建设学院,常州 213164
2. 江苏绿和环境科技有限公司,常州 213164
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摘要

为促进再生细骨料(RFA)在高延性水泥基复合材料(HDCC)中的应用,研究了RFA取代率(0％、25％、50％、75％、100％,质量分数)对HDCC抗压强度、拉伸性能、四点弯曲强度和碳化耐久性的影响.结果表明,随着RFA取代率提高,HDCC的抗压强度逐渐下降,但拉伸性能与弯曲强度显著提高.100％RFA取代率下HDCC峰值应变为3.06％,弯曲强度为7.9 MPa,较天然细骨料HDCC分别提升了 31.33％和 11.27％,表现出良好的延展特性.当RFA取代率高于50％时,有助于提高HDCC的碳化耐久性.基于测试结果进行拟合,建立了关于RFA取代率的HDCC碳化深度预测模型.

Abstract

In order to promote the application of recycled fine aggregate(RFA)in high ductility cementitious composites(HDCC),the effect of RFA replacement rate(0％,25％,50％,75％,100％,mass fraction)on compressive strength,tensile properties,four-point flexural strength and carbonation durability of HDCC was studied.The results show that with the increase of RFA replacement rate,the compressive strength of HDCC decreases gradually,but the tensile properties and flexural strength increase significantly.Under100％RFA replacement rate,the peak strain of HDCC reaches3.06％,and the flexural strength reaches 7.9 MPa,which is 31.33％and 11.27％higher than that of natural fine aggregate HDCC,respectively,showing good ductility.When the replacement rate of RFA is higher than 50％,it is helpful to improve the carbonation durability of HDCC.Based on the fitting of test results,a HDCC carbonation depth prediction model related to RFA replacement rate is established.

关键词

高延性水泥基复合材料/再生细骨料/抗压强度/拉伸性能/弯曲强度/碳化耐久性

Key words

high ductility cementitious composite/recycled fine aggregate/compressive strength/tensile property/flexural strength/carbonation durability

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基金项目

江苏省研究生科研与实践创新计划项目(KYCX_3100)

出版年

2024

硅酸盐通报

中国硅酸盐学会中材人工晶体研究院

硅酸盐通报

CSTPCD北大核心

影响因子：0.698

ISSN：1001-1625

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