双掺粉煤灰及聚羧酸减水剂再生混凝土抗渗性能及干缩性能研究.pdf

粉煤灰综合利用 FLY ASH COMPREHENSIVE UTILIZATION 2016No.5 试验与应用 双掺粉煤灰及聚羧酸减水剂再生混凝土 抗渗性能及干缩性能研究 Study on Anti Permeability and Drying Shrinkage Performance of Recycled Concrete with Fly Ash and Polycarboxylate Superplasticizer 陈树亮12,陈建国12,张凯华3,陈国庆3,孙桂山3 (1.广西壮族自治区水利科学研究院,5300232.广西水工程材料重点实验室培育基地,530023;3河海大学,100294) 摘要:采用双掺粉煤灰及聚羧酸系高性能减水剂技术,对再生混凝土进行改性处理,制备了C15、C20、C25、C30改 性再生混凝土。研究了改性再生混凝土抗渗性能,干缩性能及微观性能。结果表明:28d抗渗等级达到W6以上,90d收 宿率小于679×10-,形成了0.2~0.8m的CSH凝胶,提高了再生混凝土的抗渗性能与干缩性能。 关键词:再生混凝土;粉煤灰;聚羧酸减水剂;抗渗性能;干缩性能 中图分类号:TU528.042*.2 文献标识码:A 文章编号:1005-8249(2016)05-0033-04 Chen Shuliang ",Chen Jianguo ",Zhang Kaihua' ,Chen Guoqing' ,Sun Guishan ( 1.GuangxiHydraulic Research Institute ,Nanning 530023 ,China 2 .GuangxiKey Laboratory Cultivation Base of Water EngineeringMaterials ,Nanning 530023 ,China ; 3 .Hohai University ,Nanjing 210098 ,China ) Abstract :The recycledC15 ,C20 ,C25 and C30 concrete were modified by the technology of double mixing fly ash and polycarboxylate superplasticizer .The anti permeability ,dry shrinkage performance and micro properties modified recycled concrete were studied .The results showed that the anti permeability after 28 days reached level W6 .The shrinkage rate...