摘要
Abstract
In order to improve the shrinkage and durability of concrete,in this paper,the self-shrinkage,dry shrinkage,carbonization resist-ance and chloride penetration resistance of composite fly ash concrete under different water-binder ratios and gelling systems were systematical-ly studied.The results show that the smaller the water-binder ratio,the larger the self-shrinkage rate at early age(12-72 h),but the drying shrinkage is significantly reduced,and the durability is significantly improved.The addition of fly ash and mineral powder significantly im-proved the durability of concrete,and the carbonization depth of FSA was reduced by 11.46%,the penetration depth of chloride ions was re-duced by 29.56%,and the diffusion coefficient was reduced by 52.99%.The composite fly-ash,mineral powder and limestone powder gel-ling system has the best shrinkage performance,and the self-shrinkage rate decreases by 29.12%after 72h and 29.08%after 28d drying compared with the benchmark test.However,the dilution of limestone powder and its activity in carbonization environment have some adverse effects on the durability of concrete.关键词
复掺粉煤灰/收缩性能/耐久性能Key words
Composite fly ash/Shrinkage property/Durability分类
建筑与水利
