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A multi-phase kinetic model to simulate hydration of slag-cement blends

机译：多相动力学模型，模拟矿渣-水泥混合料的水合作用

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摘要

Ground granulated blast furnace slag, which shows cementitious behavior (latent hydraulic activity) and pozzolanic characteristics (reaction with lime), has been widely used as a mineral admixture in normal and high strength concretes. Hydration of slag-blended cement is much more complex than that of ordinary Portland cement because of the mutual interactions between the cement hydration and the slag reaction. This paper presents a kinetic hydration model for cement-slag blends. The proposed model analyzes the slag reaction separate from cement hydration by considering the production of calcium hydroxide in cement hydration and its consumption in slag reactions. The amount of free water and the amount of calcium hydroxide left in the system were adopted as the control indicators for determining the slag reaction. Using the proposed model, the reaction ratio of slag can be evaluated as a function of curing age, considering the influences of the water to binder ratio, the slag replacement ratio and the curing temperature. Furthermore, the amount of chemically-bound water (self-cementing properties), calcium hydroxide (pozzolanic capabilities), and the heat released from hydration are evaluated by determining the contributions from both the cement hydration and the slag reaction. The evaluated results show good accordance with the experimental results.
机译：具有高凝结性能（潜在的水力活性）和火山灰特性（与石灰反应）的高炉矿渣粉已广泛用作普通和高强度混凝土中的矿物掺合料。矿渣掺合水泥的水化比普通硅酸盐水泥复杂得多，因为水泥水合和矿渣反应之间存在相互作用。本文提出了水泥-矿渣共混物的动力学水化模型。该模型通过考虑水泥水化过程中氢氧化钙的产生及其在炉渣反应中的消耗情况来分析与水泥水化分开的炉渣反应。系统中残留的游离水量和氢氧化钙量被用作确定炉渣反应的控制指标。使用所提出的模型，可以考虑水与粘结剂的比例，炉渣替代率和固化温度的影响，根据炉龄对炉渣的反应率进行评估。此外，通过确定水泥水化和炉渣反应的贡献，评估了化学结合水的量（自胶结性），氢氧化钙（火山灰能力）和水化释放的热量。评价结果与实验结果吻合良好。

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