硅酸盐通报2025，Vol.44Issue(2)：623-633,11.DOI:10.16552/j.cnki.issn1001-1625.2024.1066
混掺再生粗骨料和再生微粉混凝土的早期力学性能
Early Mechanical Properties of Concrete Mixed with Recycled Coarse Aggregate and Recycled Powder
摘要
Abstract
To address the issue of the low utilization rate of construction waste,this paper investigated the compressive strength of concrete prepared using recycled coarse aggregate and recycled powder from different acquisition methods and substitution methods.It also established a predictive model for the time-varying early compressive strength of concrete when mixing recycled powder and recycled coarse aggregate concrete,and analyzed the carbon footprint of the prepared concrete.The study included comparisons between over-substitution and standard substitution,as well as between recycled powder obtained by grinding and obtained by screening.Combined with scanning electron microscopy and mercury intrusion method,the micro-test of concrete samples was carried out,and the reasons for the micro-level change of concrete strength were analyzed.The results indicate that the impact of recycled powder on the mechanical properties of concrete is more significant than that of recycled coarse aggregate.As the content of recycled powder increases from 0％to 30％(mass fraction),the development of early compressive strength of the concrete gradually slows down.The porosity of concrete increases rapidly and the percentage of more hazardous hole also increases.In addition,the predictive model for the time-varying early compressive strength of recycled concrete established with the replacement rate of recycled powder and recycled coarse aggregate is well fitted,which can be used as a reference in engineering practice.关键词
再生微粉/再生粗骨料/抗压强度/碳足迹/预测模型/微观分析Key words
recycled powder/recycled coarse aggregate/compressive strength/carbon footprint/predictive model/microanalysis分类
建筑与水利引用本文复制引用
毕钰,秦拥军,罗玲,姚子祺,刘凤超,阳毅恒..混掺再生粗骨料和再生微粉混凝土的早期力学性能[J].硅酸盐通报,2025,44(2):623-633,11.基金项目
自治区重点研发项目(2022B03036) （2022B03036）
自治区自然科学基金重点项目(2022D01D27) （2022D01D27）
