摘要
对于不同养护龄期、不同粉煤灰掺量及不同水胶比对混凝土碳化的影响进行研究,混凝土的碳化深度与碳化龄期之间的关系可用幂函数D=αTβ进行曲线回归分析,且相关性较好。结果表明,随着粉煤灰掺量及水胶比的增大,混凝土的碳化越严重;混凝土养护龄期越长,混凝土的抗碳化性越好。养护不充分时,高掺量粉煤灰混凝土后期碳化增长速率快;养护较充分时,粉煤灰掺量越小,混凝土早期抗碳化性越好,粉煤灰掺量越大,混凝土后期碳化增长速率越慢。当养护较充分时,水胶比为0.35,粉煤灰掺量为45%时,粉煤灰混凝土抗碳化性较好,能满足工程要求。
The effect of different curing periods,fly ashes and various water-cement ratios of concrete carbonation.The power function D=α Tβ can be used to analyze the relationship between depth and age of concrete carbonation regression,and there is a good correlation between them.The results show that the more fly ash and water-cement ratio,the more serious the carbonation of concrete;the longer the curing time,the better carbonation resistance of concrete.When the curing time is not sufficient,the late high-volume fly ash concrete carbonation increases faster.The curing time is sufficient,the less the fly ash ratio,the better the early anti-carbonation of the concrete;the more the fly ash ratio,the slower growth rate of the concrete carbonation.when the curing time is sufficient and the water-cement ratio is 0.35,the fly ash ratio is 45 percent,the resistance of fly ash concrete carbonation can meet the project requirements better.
出处
《中国农村水利水电》
北大核心
2012年第4期150-152,156,共4页
China Rural Water and Hydropower
关键词
混凝土碳化
养护龄期
粉煤灰掺量
水胶比
concrete carbonation
curing time
fly ash ratio
water-cement ratio
