Predicting pore volume, compressive strength, pore connectivity, and formation factor in cementitious pastes containing fly ash
Predicting pore volume, compressive strength, pore connectivity, and formation factor in cementitious pastes containing fly ash
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DOI：
10.1016/j.cemconcomp.2021.104113
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发表时间：
2021-09
影响因子：
10.5
通讯作者：
K. Bharadwaj;R. Ghantous;F. Sahan;O. Isgor;W. Weiss
中科院分区：
文献类型：
--
作者：
K. Bharadwaj;R. Ghantous;F. Sahan;O. Isgor;W. Weiss
本文介绍了使用热力学模型来预测含粉煤灰水泥浆体的反应产物和性能。孔隙分配模型用于估计凝胶和毛细管孔隙体积。膏体性能预测的孔隙率，抗压强度，地层因素，和除冰盐损害的敏感性。提出了一个模型，以量化的孔细化时发生的粉煤灰。预测的性能之间的比较模型和性能的实验测量水泥浆与两个粉煤灰在不同的水结合比和不同的替代水平。预测孔隙度的误差为5%; OPC系统的抗压强度为14%，OPC + FA系统的抗压强度为26%; OPC系统的地层系数为1 - 20%，OPC+20%FA系统的地层系数为13-26%，OPC+40%FA系统的地层系数为18-46%。
This paper describes the use of thermodynamic modeling to predict the reaction products and properties of cementitious pastes containing fly ash. A pore partitioning model is used to estimate the gel and capillary pore volumes. The paste performance is predicted in terms of its porosity, compressive strength, formation factor, and deicing salt damage susceptibility. A model is proposed to quantify the pore refinement that occurs when fly ash is used. Comparisons are made between the predicted properties by the model and properties of experimentally measured cementitious pastes with two fly ashes at different water-to-binding ratios and varying replacement levels. The error in predicting porosity is 5%; compressive strength is 14% for OPC systems and 26% for OPC + FA systems; and formation factor is between 1 and 20% for OPC systems, 13–26% for the OPC+20%FA systems, and 18–46% for the OPC+40%FA systems.