Ming Yang, Li Ling, Ren Hao, Chen Ping, Chen Xuandong
Guangxi Key Laboratory of New Energy and Building Energy Saving, Guilin 541004, China.
College of Civil and Architecture Engineering, Guilin University of Technology, Guilin 541004, China.
Materials (Basel). 2023 Feb 27;16(5):1957. doi: 10.3390/ma16051957.
As supplementary cementitious material, glass powder has been widely used in concrete, and many investigations on the mechanical properties of glass powder concrete have been carried out. However, there is a lack of investigations on the binary hydration kinetics model of glass powder-cement. Based on the pozzolanic reaction mechanism of glass powder, the purpose of this paper is to establish a theoretical model of the binary hydraulic kinetics model of glass powder-cement to investigate the effect of glass powder on cement hydration. The hydration process of glass powder-cement mixed cementitious materials with different glass powder contents (e.g., 0, 20%, 50%) was simulated using the finite element method (FEM). The numerical simulation results are in good agreement with the experimental data of hydration heat in the literature, which verifies the reliability of the proposed model. The results show that the glass powder can dilute and accelerate the hydration of cement. Compared to the sample with 5% glass powder content, the hydration degree of the glass powder decreased by 42.3% for the sample with 50% glass powder content. More importantly, the reactivity of the glass powder decreases exponentially with the increase in the glass particle size. In addition, the reactivity of the glass powder tends to be stable when the glass particle size is greater than 90 μm. With the increase in the replacement rate of the glass powder, the reactivity of the glass powder decreases. When the replacement rate of the glass powder is greater than 45%, the concentration of CH reaches a peak at the early stage of the reaction. The research in this paper reveals the hydration mechanism of glass powder and provides a theoretical basis for the application of glass powder in concrete.
作为辅助胶凝材料，玻璃粉已广泛应用于混凝土中，并且已经对玻璃粉混凝土的力学性能进行了许多研究。然而，缺乏对玻璃粉 - 水泥二元水化动力学模型的研究。基于玻璃粉的火山灰反应机理，本文旨在建立玻璃粉 - 水泥二元水化动力学模型的理论模型，以研究玻璃粉对水泥水化的影响。使用有限元方法（FEM）模拟了不同玻璃粉含量（例如0、20％、50％）的玻璃粉 - 水泥混合胶凝材料的水化过程。数值模拟结果与文献中的水化热实验数据吻合良好，验证了所提出模型的可靠性。结果表明，玻璃粉可以稀释并加速水泥的水化。与玻璃粉含量为5％的样品相比，玻璃粉含量为50％的样品中玻璃粉的水化程度降低了42.3％。更重要的是，玻璃粉的反应活性随玻璃粒径的增加呈指数下降。此外，当玻璃粒径大于90μm时，玻璃粉的反应活性趋于稳定。随着玻璃粉替代率的增加，玻璃粉的反应活性降低。当玻璃粉替代率大于45％时，CH浓度在反应初期达到峰值。本文的研究揭示了玻璃粉的水化机理，为玻璃粉在混凝土中的应用提供了理论依据。
