摘要
减水剂与粉煤灰共存是工程应用的实际情况,但究竟减水剂对不同粒度粉煤灰掺和水泥的工作性能影响如何,相关报道尚少。本文讨论了减水剂对不同粒度粉煤灰掺和水泥流动性、保坍性、减水率、抗折/抗压强度以及凝结时间的影响,并对水化产物的微观形貌进行比较与分析。结果表明:当粒度最小为13μm时,粉煤灰掺和水泥的初始流动度最高达到275 mm,60 min后流动度基本保持不变;减水率可达36%;抗压强度不随粒度变化而变化,与空白试样相当;凝结时间结果表明减水剂的引入可减缓水泥水化速度;SEM结果与强度及凝结时间结果相一致。
The phenomena of fly ash and water reducer used together in the cement field was very common and meaningful, while the reports about it were few. In this paper, polycarboxylic water reducer and fly ash with five different diameters were mixed with cement. Then the fluidity, fluidity loss, water reducing ratio, flexural and compressive strength and setting time were studied in detail. The morphology of hydration product of cement was observed by SEM. The results showed that when fly ash with the smallest diameter as 13 ~m was introduced into cement, the initial fluidity can reach highest value as 275 mm and even after 60 rain, it still can keep well. The water reducing ratio can also reach highest value as 36% when using the smallest one. The compressive strength of mortar did not change with decreasing the particle sizes of fly ash. The setting time of cement mixed with fly ash using diameter as 13 μm was retarded after introducing water reducer. SEM results were consistent with the results of compressive strength and setting time as above.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2013年第11期2306-2310,共5页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金青年基金项目资助(51204131)
关键词
聚羧酸减水剂
粉煤灰
粒度
水泥
性能
polycarboxylic water reducer
fly ash
particle size
cement
performance
