期刊论文

Effect of Recycled Coarse Aggregate Soaked in Bacillus Cohnii Solution on Compressive Strength of Concrete

中文

长江科学院院报

1001-5485

2020

37

11

136-140,148

10.11988/ckyyb.20190800

(2015SK2058-4):湖南省科技厅重点研发计划项目 (2018XJXZ257):南华大学大学生创新训练实验项目

本校为第一机构

将实验室废弃的强度等级为C30混凝土试块经人工破碎后通过筛选得到粒径为20~ 50 mm的再生粗骨料。为探究科氏芽孢杆菌矿化沉积对再生粗骨料的影响,研制了不同pH条件科氏芽孢杆菌菌液浸泡处理的再生粗骨料。利用科氏芽孢杆菌菌液浸泡处理后的再生粗骨料(取代率选用20%)制备再生骨料混凝土,开展了再生骨料混凝土试件的单轴抗压强度和声发射损伤特征试验,分析了不同pH条件的科氏芽孢杆菌矿化沉积再生粗骨料对浸泡液残余Ca~(2+)浓度、混凝土峰值抗压强度和损伤演化的影响。试验结果表明:科氏芽孢杆菌菌液浸泡处理再生粗骨料后,残余Ca~(2+)浓度随浸泡液pH值的减小而减少,科氏芽孢杆菌菌液浸泡能有效改...

The compressive strength and damage evolution of recycled coarse aggregate concrete under the influence of mineralization and precipitation of Bacillus Cohnii were examined via uniaxial compression test and acoustic emission test.The recycled coarse aggregates used in the present test were prepared from waste C30 concrete blocks through crushing and screening(particle size in the range of 20-50 mm),and then soaked in Bacillus Cohnii solutions of different pH values.In subsequence,the recycled coarse aggregates were used for preparing recycled concrete specimens with a replacement ratio of 20%....