This work attempts to elucidate the foaming kinetics, hierarchical structures, engineering properties and mechanisms of cement foams with high-volume quartz powder (QP) of different fineness from 200 to 2000 meshes. Comprehensive experiments were conducted to measure the fresh slurry properties, foaming process, penetration strength, and structure of the foams and skeletons. Foaming kinetics was analyzed using fractional-kinetic (FK), pseudo first-order (PFO) and pseudo second-order (PSO) models. Results show that the increase of QP fineness can, respectively, keep, increase and decrease the pH, viscosity, and flowability. The FK model shows the best fitting goodness of foaming kinetics, and the slurry with the QP fineness of 600 meshes possesses the fastest foaming speed. Fine QP shortens the induction time and exothermic peak time, and improve the collapse strength. Coarse QP induces more small bubbles and severe breakage of skeleton, and coarsen the nanopores. The interrelationships among the experiment outcomes and the mechanisms of colloidal adhesion, nucleation and growth of bubbles and cement hydrates, and microstructure development in skeletons are profoundly discussed. The findings deepen the mechanistic understanding of cement foams with different size particles.

中文翻译：

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粒径对水泥泡沫的影响

本工作试图阐明200至2000目不同细度的大体积石英粉（QP）水泥泡沫的发泡动力学、分级结构、工程性能和机理。进行了综合实验来测量新鲜浆料的性能、发泡过程、渗透强度以及泡沫和骨架的结构。使用分数动力学 (FK)、伪一级 (PFO) 和伪二级 (PSO) 模型分析发泡动力学。结果表明，QP细度的增加可以分别保持、增加和降低pH、粘度和流动性。 FK模型表现出最佳的发泡动力学拟合度，QP细度为600目的浆料具有最快的发泡速度。精细的QP缩短了诱导时间和放热峰值时间，提高了崩塌强度。粗的QP会导致更多的小气泡和严重的骨架破坏，并使纳米孔变粗。深入讨论了实验结果与胶体粘附、气泡和水泥水合物的成核和生长以及骨架中微观结构发展的机制之间的相互关系。这些发现加深了对不同尺寸颗粒的水泥泡沫的机理理解。