硅酸盐学报2012，Vol.40Issue(10)：1427-1430,4.
养护温度和粉煤灰对补偿收缩混凝土膨胀效能的影响
Effects of Curing Temperature and Fly Ash on the Expansion Efficiency of Shrinkage-Compensating Concrete
摘要
Abstract
The restrained expansion rate and compressive strength of shrinkage-compensating concrete were determined to investigate the effects of curing temperature and fly ash dosage on the expansion efficiency.The results show that the compressive strengths of concrete at different ages develop evenly in curing at 20 ℃ and 40℃,and the substantial strength gain can be achieved at early ages and the rate of strength gain is quite slow at later ages in curing at 60 ℃.Although fly ash can be activated at a high temperature,the addition of fly ash still impede the strength development at different temperatures at early ages.However,fly ash can highly improve the strength and the strength gain grows with a greater amount of fly ash in a longer curing at high temperatures.Temperature has a significant impact on the expansion efficiency of HCSA expansive agent.The elevated temperature can accelerate the hydration of expansive agent and thus increase the expansion of concrete at early ages.A proper amount of fly ash can also improve the concrete expansion.The expansion gain of concrete due to the increase of temperature increases with increasing the amount of fly ash.The expansion and strength development of shrinkage-compensating concrete with a greater amount of fly ash can be affected by temperature.关键词
补偿收缩混凝土/粉煤灰/硫铝酸钙–氧化钙类膨胀剂/养护温度Key words
shrinkage-compensating concrete/fly ash/HCSA expansive agent/curing temperature分类
土木建筑引用本文复制引用
苗苗,米贵东,阎培渝,刘仍光..养护温度和粉煤灰对补偿收缩混凝土膨胀效能的影响[J].硅酸盐学报,2012,40(10):1427-1430,4.基金项目
NSFC-广东联合基金重点项目（U1134008）资助项目 （）
