Thermodynamic modeling of the essential physicochemical interactions between the pore solution and the cement hydrates in chloride-contaminated cement-based materials
Thermodynamic modeling of the essential physicochemical interactions between the pore solution and the cement hydrates in chloride-contaminated cement-based materials
复制标题
受氯化物污染的水泥基材料中孔隙溶液和水泥水合物之间基本物理化学相互作用的热力学模型
DOI：
10.1016/j.jcis.2018.07.005
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发表时间：
2018-12-01
影响因子：
9.9
通讯作者：
Li, Zuohua
中科院分区：
文献类型：
--
作者：
Guo, Bingbing;Hong, Yi;Li, Zuohua
水泥基材料的氯离子迁移特性是由孔隙溶液与水泥水化产物之间的物理化学作用决定的。本文建立了基于表面络合反应和溶解/沉淀反应的热力学模型，以研究基本的物理化学相互作用。氯离子浓度，温度和饱和度（水体积与孔体积的比率）的物理化学相互作用的影响进行了详细研究，使用所得的热力学模型。已发表的实验结果表明，所得到的热力学模型准确地反映了水泥水化物对氯离子的吸附能力。因此，该热力学模型可以耦合到传输方程，以实现新的钢筋混凝土结构（RCS）的耐久性设计或预测现有的RCS的使用寿命。它还可以根据材料的热力学和动力学优化RCS的腐蚀控制策略。(C)2018爱思唯尔公司All rights reserved.
The chloride transport properties of cement-based materials are determined via the physicochemical interactions between the pore solution and the cement hydrates. Herein, a thermodynamic model based on surface complexation reactions and dissolution/precipitation reactions was established to investigate the essential physicochemical interactions. The effects of chloride concentration, temperature, and saturation degree (the ratio of water volume to pore volume) on the physicochemical interactions were studied in detail using the resulting thermodynamic model. The published experimental results indicate that the resulting thermodynamic model accurately reflects the adsorption capacity of cement hydrates for chloride ions. Thus, this thermodynamic model can be coupled to the transport equations to achieve the durable designs for new reinforced concrete structures (RCSs) or to predict the service life of existing RCSs. It can also optimize corrosion control strategies for RCSs based on the thermodynamics and kinetics of the material. (C) 2018 Elsevier Inc. All rights reserved.