We prepare and study cement foam samples with well-controlled structure, i.e. containing monodisperse bubbles. We observe that the foam structure often changes before cement setting and identify ripening as the major destabilization mechanism at stake. Drainage plays only a minor role in cement foam destabilization except when bubble size is large. Then we show that a single stability criterion can be defined, for a large range of cement foams with different formulations. This criterion involves the bubble radius and the yield stress of the cement paste such as confined by and between the bubbles, at a given characteristic time after sample preparation.

中文翻译：

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新鲜水泥泡沫的稳定性判据

我们准备和研究具有良好控制结构的水泥泡沫样品，即含有单分散气泡。我们观察到泡沫结构经常在水泥凝固之前发生变化，并将成熟确定为主要的不稳定机制。排水在水泥泡沫不稳定中只起次要作用，除非气泡尺寸很大。然后我们表明可以为具有不同配方的大范围水泥泡沫定义单一稳定性标准。该标准涉及气泡半径和水泥浆的屈服应力，例如在样品制备后的给定特征时间内，气泡限制在气泡内和气泡之间。