This work reports the kinetics and structures of cement-limestone powder foams cast at the temperature between 27 and 42 °C. The pH, viscosity, flowability, temperature history and height of the slurries were measured, and the foaming kinetics was interpreted with the Weibull and Log-Logistic dose-time models. The structures and mechanical properties of the hardened foams were tested at 28 d. The results show that an increase of 15 °C increased the viscosity by 2.6 times, accelerated the foaming rate by a factor of 20, enlarged the foam heterogeneity, coarsened the foam size, and deceased the pH, flowability and penetration strength. However, the hydration products and nanoscale pore structures of the skeletons did not change with temperature. The mechanisms of clinker dissolution, and the nucleation and growth of foams in temperature-affected adhesive particles may account for the experiment outcomes. The findings deepen the mechanistic understandings of temperature-affected cement foaming kinetics and structures.

中文翻译：

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温度影响水泥发泡和泡沫

这项工作报告了在 27 至 42 °C 温度下铸造的水泥石灰石粉末泡沫的动力学和结构。测量了浆料的 pH 值、粘度、流动性、温度历史和高度，并用 Weibull 和 Log-Logistic 剂量时间模型解释了发泡动力学。 28 d 后测试硬化泡沫的结构和力学性能。结果表明，温度升高15℃，粘度增加2.6倍，发泡速率加快20倍，泡沫不均匀性增大，泡沫尺寸粗化，pH值、流动性和渗透强度下降。然而，骨架的水化产物和纳米级孔隙结构不随温度变化。熟料溶解的机制以及受温度影响的粘合剂颗粒中泡沫的成核和生长可以解释实验结果。这些发现加深了对受温度影响的水泥发泡动力学和结构的机理理解。