Preparation of Shrinkage Compensating Concrete with HCSA Expansive Agent

3rd Annual International Workshop on Materials Science and Engineering

Li, Changcheng^1 ; Jia, Fujia^1

China Building Materials Academy, Guanzhuang Dongli 1#, Chaoyang District, Beijing, China^1

关键词: Concrete cracking;    Cracking resistance;    Cracking stress;    Expansive agents;    Restrained expansion rates;    Shrinkage-compensating concrete;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/250/1/012037/pdf
DOI  :  10.1088/1757-899X/250/1/012037

来源: IOP

【 摘 要 】

Shrinkage compensating concrete (SCC) has become one of the best effective methods of preventing and reducing concrete cracking. SCC is prepared by HCSA high performance expansive agent for concrete which restrained expansion rate is optimized by 0.057%. Slump, compressive strength, restrained expansion rate and cracking resistance test were carried out on SCC. The results show that the initial slump of fresh SCC was about 220mm-230mm, while slump after 2 hours was 180mm-200mm. The restrained expansion rate of SCC increased with the mixing amount of expansive agent. After cured in water for 14 days, the restrained expansion rate of C35 and C40 SCC were 0.020%-0.032%. With the dosage of expansive agent increasing, restrained expansion rate of SCC increased, maximum compressive stress and cracking stress improved, cracking temperature fell, thus cracking resistance got effectively improvement.