Hydration of Portland cement with high replacement by siliceous fly ash
Hydration of Portland cement with high replacement by siliceous fly ash
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DOI：
10.1016/j.cemconres.2012.06.009
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发表时间：
2012-10-01
影响因子：
11.4
通讯作者：
Neubauer, Juergen
中科院分区：
文献类型：
--
作者：
Deschner, Florian;Winnefeld, Frank;Neubauer, Juergen
在550天的水化时间内，研究了两种不同的低钙粉煤灰对掺量为50%的普通硅酸盐水泥（OPC）膏体水化的影响。结果与含有50wt .%惰性石英粉的OPC参考混合物进行了比较，从而区分了“填充效应”和火山灰反应。直到2天，没有测量到粉煤灰反应的证据，其对水化的影响主要与“填料效应”有关。从第7天开始，通过观察硅酸盐的消耗、孔溶液化学的变化、可能富水的内部水化产物的形成以及C-S-H组成的变化来观察火山灰反应的影响，与纯OPC相比，C-S-H的Al/Si比更高。水化28天后，由于火山灰反应产生了额外的强度。(C) 2012 Elsevier Ltd.版权所有。
The effects of two different low calcium fly ashes on the hydration of ordinary Portland cement (OPC) pastes containing 50 wt.% of fly ash were investigated over a hydration time of 550 days. The results were compared with a reference blend of OPC containing 50 wt.% of inert quartz powder allowing the distinction between "filler effect" and pozzolanic reaction.Until 2 days, no evidence of fly ash reaction was measured and its influence on the hydration is mainly related to the "filler effect". From 7 days on, the effects of the pozzolanic reaction were observed by the consumption of portlandite, the change of the pore solution chemistry, the formation of a presumably water-rich inner hydration product and the change of the C-S-H composition towards higher Al/Si ratio compared to the C-S-H of neat OPC. Additional strength due to the pozzolanic reaction developed after 28 days of hydration. (C) 2012 Elsevier Ltd. All rights reserved.