摘要
试验研究了粉煤灰和矿粉对水泥胶砂自收缩的影响.结果表明:当胶砂比(质量比)为1:0.5,水胶比(质量比)为0.3时,随水化龄期延长,水泥胶砂自收缩增大,早期自收缩发展急剧.粉煤灰降低了水泥胶砂的自收缩,随着粉煤灰掺量(质量分数)增大,水泥胶砂自收缩减小;掺10%和20%粉煤灰水泥胶砂的21 d自收缩较纯水泥胶砂分别下降了21.1%和29.5%.水化早期(5d前),矿粉掺量(质量分数)在10%～20%时,随着矿粉掺量增大,水泥胶砂自收缩降低;掺10%和20%矿粉水泥胶砂的21 d自收缩较纯水泥胶砂分别增加了11.1%和6.6%.
The influence of fly ash and slag powder on the autogenous shrinkage of cement mortars was studied. The experiment test results indicate that the autogenous shrinkage of cement mortar made with 1：0.5 binder to sand ratio（by mass） and 0.3 water to binder ratio（by mass） increases with development of hydration. At early age, rate of autogenous shrinkage develops sharply. Addition of fly ash reduces the autogenous shrinkage of cement mortar, and the autogenous shrinkage of cement mortar decreases with in- crease of fly ash content（by mass）. Compared to pure cement mortar, after hydrated for 21 d , the 10% and 20% of fly ash addition reduce autogenous shrinkage of cement mortar by 21.1% and 29.5% respectively. Originally within 5 d, the 10%-20% （by mass） of slag powder addition decreases autogenous shrinkage of cement mortar. Compared to pure cement mortar, after hydrated for 21 d, the 10% and 20% of slag powder addition increase autogenous shrinkage of cement mortar by 11.1% and 6.6 % respectively.
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2011年第5期604-609,共6页
Journal of Building Materials
关键词
粉煤灰
矿粉
水泥胶砂
自收缩
fly ash
slag powder
cement mortar
autogenous shrinkage
