首页|期刊导航|硅酸盐通报|等强度条件下粉煤灰对补偿收缩混凝土变形性能的影响

等强度条件下粉煤灰对补偿收缩混凝土变形性能的影响OA北大核心CSCDCSTPCD

Influence of Fly Ash on the Deformation of Shrinkage-compensating Concrete with the Same Level of Strength

中文摘要英文摘要

通过测定水中限制膨胀率和水养7d转干空后的限制膨胀率,计算干燥收缩落差,讨论粉煤灰在等强度条件下对补偿收缩混凝土变形性能的影响.结果表明:等强度条件下掺加适量粉煤灰可以明显地促进限制膨胀率的增长;掺量过大容易导致早期约束不足,降低对限制膨胀的促进作用.粉煤灰可以明显降低混凝土转干空后早期的干燥收缩落差.随着粉煤灰掺量增加,干燥收缩落差进一步降低,空气中放置28 d后均表现为膨胀.对于硫铝酸钙-氧化钙类膨胀剂和粉煤灰复掺的补偿收缩混凝土,膨胀剂最小用量的要求可以适当降低.

Percentages of restrained expansion of shrinkage-compensating concrete cured moistly and dryly after 7 d moist curing were investigated, and variation of expansion decline was calculated to discuss the effect of fly ash on the deformation of shrinkage-compensating concrete with the same level of strength. The results show that fly ash can improve the expansion of concrete cured moistly, proper amount of fly ash can significantly increase expansion but with l…查看全部>>

苗苗;米贵东;阎培渝

清华大学土木工程系土木工程安全与耐久教育部重点实验室,北京100084清华大学土木工程系土木工程安全与耐久教育部重点实验室,北京100084清华大学土木工程系土木工程安全与耐久教育部重点实验室,北京100084

建筑与水利

补偿收缩混凝土粉煤灰HCSA膨胀剂限制膨胀率强度

shrinkage-compensating concrete fly ashHCSA expansive agent percentage of restrained expansion strength

《硅酸盐通报》 2012 (3)

501-505,5

NSFC-广东联合基金重点项目(U1134008)

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