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Production of morphology-controlled cement foams remains challenging, mainlydue to bubble stability issues during cement setting. The use of cement pastewith high yield stress is expected to promote stability by damping intrinsicbubble kinetics. Here we show however that for given W/C ratio, fresh foamstability can be achieved instead by decreasing the yield stress of the cementpaste. Indeed, in this low apparent yield stress regime, van der Waalsattraction between cement grains is reduced and grains are allowed to beefficiently packed by bubbles, providing enhanced mechanical properties. Thisresult is obtained for two distinct additives used at controlled concentrationsand without resorting to set accelerators, which highlights the generalsignificance of the underlying stability mechanism. It offers a promisingsolution to produce stable cement foams at high air content.

Optimal cement paste yield stress for the production of stable cement foams