【摘要】 采用草酸浸泡法对再生骨料进行处理，旨在提升其物理力学性能。选取质量分数为1%、3%、5%的草酸溶液及1 d、3 d、7 d的浸泡时长，通过正交试验设计获得9种处理条件，并测试质量损失率、吸水率、表观密度及压碎指标。结果表明，草酸浸泡可显著降低再生骨料吸水率、提高表观密度、降低压碎指标，其中3%草酸浸泡3 d效果最佳，吸水率降幅达19.6%,最低降至4.6%。进一步以不同的再生骨料替代率(20%～100%)来替代天然骨料配置混凝土，测试坍落度及力学性能，并结合成本、碳排放与能耗进行综合评比。结果发现20%替代率的草酸处理再生骨料混凝土综合性能最优。更多还原

【Abstract】 An oxalic acid soaking method was employed to treat recycled aggregate, aiming to enhance its physical and mechanical properties.Oxalic acid solutions with mass fractions of 1%,3%,and 5%,along with soaking durations of 1 day, 3 days, and 7 days, were selected to create 9 treatment conditions through orthogonal experimental design.The mass loss rate, water absorption, apparent density, and crushing index were tested.The results indicate that oxalic acid soaking can significantly reduce the water absorption of recycled aggregate, increase its apparent density, and decrease its crushing index.Among them, soaking in 3% oxalic acid for 3 days yields the best results, with a water absorption reduction of up to 19.6%,reaching a minimum of 4.6%.Furthermore, concrete was prepared by replacing natural aggregate with recycled aggregate at different replacement rates(20% to 100%).The slump and mechanical properties were tested, and a comprehensive evaluation was conducted considering cost, carbon emissions, and energy consumption.The results show that the concrete incorporating recycled aggregate treated with oxalic acid at a 20% replacement rate exhibits the best overall performance.更多还原