Effects of water/powder ratio, mixing ratio of fly ash, and curing temperature on pozzolanic reaction of fly ash in cement paste
Effects of water/powder ratio, mixing ratio of fly ash, and curing temperature on pozzolanic reaction of fly ash in cement paste
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DOI：
10.1016/s0008-8846(00)00441-5
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发表时间：
2001-01-01
影响因子：
11.4
通讯作者：
Hwang, KR
中科院分区：
文献类型：
--
作者：
Hanehara, S;Tomosawa, F;Hwang, KR
通过对粉煤灰中氢氧化钙生成量和火山灰反应率的测定，研究了粉煤灰的配合比和养护温度对粉煤灰在水泥浆体中火山灰反应的影响。根据粉煤灰不溶残渣和Al2O3溶出量，可以准确判断粉煤灰在水泥浆体中的反应率。在养护温度为40 ℃、水粉比为50%、粉煤灰取代率为40%的条件下，粉煤灰的反应率在7d和1年时分别为12%和32%。养护温度越高或水粉比越大，粉煤灰的反应率越高。在20 ℃的固化温度下火山灰反应的开始时间是在28天或更长的龄期，因为在28天的反应率接近0%。粉煤灰在水泥浆体中的火山灰反应高度依赖于养护温度。粉煤灰的反应率随粉煤灰取代率的增加而降低。(C)2001爱思唯尔科技有限公司版权所有。
The effects of the mix proportion and curing temperature on the pozzolanic reaction of fly ash in cement paste were investigated by examining the productions of calcium hydroxide and the pozzolanic reaction ratio of fly ash. It is possible to accurately determine the reaction ratio of fly ash in cement paste from the insoluble residue and the quantity of dissolved Al2O3. The reaction ratios of fly ash, at the curing temperature of 40 degreesC, the water/powder ratio of 50%, and the substitution rate of fly ash of 40%, are 12% and 32% at the ages of 7 days and 1 year, respectively. The higher the curing temperature or the higher the water/powder ratio is, the higher the reaction ratio of fly ash. The starting time of the pozzolanic reaction at the curing temperature of 20 degreesC is at the age of 28 days or more because the reaction ratio at 28 days is nearly 0%. The pozzolanic reaction of fly ash in cement paste highly depends upon the curing temperature. The reaction ratio of fly ash decreases with an increasing fly ash substitution rate. (C) 2001 Elsevier Science Ltd. All rights reserved.