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The damage of calcium sulfoaluminate cement paste partially immersed in MgSO4 solution

机译：部分浸入MgSO4溶液中的硫铝酸钙水泥浆的破坏

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摘要

One of controversies on the sulfate salt weathering of ordinary concrete is that MgSO4 does not show physical crystallization distress on concrete as the same as on masonry. In this paper, the Calcium sulfoaluminate (CSA) cement paste was partially immersed in 10 % MgSO4 solution to study if MgSO4 crystal can be identified in the damaged paste because the hydration products of CSA cement paste do not contain Ca (OH)(2) that playing a vital role in chemical sulfate attack on concrete. The results showed that the low parts in the solution showed more severe damage observation than the upper part in contact with air after 5 months exposure. MgSO4 could not be identified in the damaged paste of upper part. The damage of paste was still a typical chemical sulfate attack characterized by amounts of CaSO4 center dot 2H(2)O crystals formation due to the decomposition of ettringite by Mg2+, even without the effect of Ca (OH)(2). The so-called physical sulfate attack still cannot be confirmed on MgSO4 attack on CSA cement paste.
机译：关于普通混凝土的硫酸盐盐耐候性的争议之一是，MgSO4不会像混凝土一样显示出对混凝土的物理结晶困扰。本文将硫铝酸钙（CSA）水泥浆部分浸入10％MgSO4溶液中，研究是否可以在损坏的浆液中鉴定出MgSO4晶体，因为CSA水泥浆的水合产物不含Ca（OH）（2）在化学硫酸盐侵蚀混凝土中起着至关重要的作用。结果表明，暴露5个月后，溶液的下部比与空气接触的上部显示出更严重的损坏观察。上部损坏的糊状物中未鉴定出MgSO4。糊剂的损害仍然是典型的化学硫酸盐侵蚀，其特征是由于钙矾石被Mg2 +分解而形成的CaSO4中心点2H（2）O晶体形成量，即使没有Ca（OH）（2）的影响。对于CSA水泥浆的MgSO4侵蚀，仍不能确定所谓的物理硫酸盐侵蚀。

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