双膨胀水泥研究

A Study on Doubleexpansive Cement

双膨胀水泥同时利用了钙矾石和氧化镁两个膨胀源 ,钙矾石膨胀主要发生在 2 8天以前 ,氧化镁膨胀主要发生在 2 8天以后 ,两者恰当组合 ,获得适宜的膨胀量和膨胀分布 ,从而可以比较有效地补偿大坝等大体积混凝土的体积收缩。

Doubleexpansive cement is a new type cement in which both ettringite and MgO expansive sources are used. The formation and expansion of ettringite are very fast(in the first 28 days), and the hydration and expansion of MgO in clinker are very slow(mainly developed after 28 days). By the combination of them, appropriate magnitude and contribution of expansion can be obtained, to compensate the shrink of massive cement concrete effectively, dams for example.