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

作　　者：陈树亮 陈建国 张凯华[3] 陈国庆[3] 孙桂山[3] 

机构地区：[1]广西壮族自治区水利科学研究院,530023 [2]广西水工程材料重点实验室培育基地,530023 [3]河海大学,100294

出　　处：《粉煤灰综合利用》2016年第5期33-36,共4页Fly Ash Comprehensive Utilization

基　　金：广西水利厅科技项目(201312;201419)

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收缩率小于679×10^(-6),形成了0.2~0.8μm的CSH凝胶,提高了再生混凝土的抗渗性能与干缩性能。The recycled C15,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 of modified recycled concrete were studied. The results showed that the anti permeability after 28 days reached level W6. The shrinkage rate after 90 days was less than 679 × 10^（-6）. 0. 2 ~ 0. 8μm CSH gelswere was formed. The double mixing technology can improve the anti permeability and dry shrinkage performance of recycled concrete.

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 

分 类 号：TU528.042.2[建筑科学—建筑技术科学]