钙矾石膨胀和水镁石膨胀的相干性

Research on the Expansion Coherence between Ettringite and Brucite

摘要:

对钙矾石膨胀和水镁石膨胀的相干性进行了研究，得到：当熟料中ＭｇＯ含量接近５．０％，而ＳＯ３含量大于３．５％，钙矾石膨胀和水镁石膨胀的相干性明显；当熟料中ＭｇＯ含量接近５．０％，ＳＯ３含量小于并接近３．５％时，钙矾石膨胀和水镁石膨胀的相干性较小，且这种相干性是有利的，即钙矾石的膨胀有助于水镁石膨胀能作更多的膨胀功；当熟料中ＭｇＯ含量接近５．０％，ＳＯ３含量较小时，钙矾石和水镁石膨胀几乎不相干。在配制补偿收缩的高强混凝土时，利用钙矾石膨胀和水镁石膨胀的相干性，可以达到补偿其后期干缩的效果。

Abstract:

The expansion coherence between ettringite and brucite has been studied. Results indicated that the coherence was obviously under the condition of w (MgO)=5.0% in clinker and w (SO 3)> 3.5 % in cement. The coherence did not show under the condition of w (MgO)=5.0% in clinker and SO 3 content being low (<3.5%) in cement. Furthermore little coherence was showed under the condition of w (MgO)=5.0% in clinker and SO 3 content being close to 3.5% in cement. It is suggested from the results that the dry shrinkage in long term of high performance concrete may be compensated by the expansion coherence between ettringite and brucite.