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钙矾石是硫铝酸盐水泥水化的主要产物,决定着硫铝酸盐水泥的性能,而在硅酸盐水泥混凝土中影响也非常重要。钙矾石的形成条件决定了其形貌,其形成时间影响着水泥和混凝土的性能。采用化学合成方法合成钙矾石,研究了不同合成条件对钙矾石形成和形貌的影响。结果表明:不同原料合成的钙矾石形貌显著不同且长宽比差异显著;适当提高温度能够促进钙矾石的形成,80℃条件下反应可以形成钙矾石且形貌多样,100℃条件下反应钙矾石不能稳定存在;随着液相p H值的增加,钙矾石的长宽比逐渐减小;硼酸抑制钙矾石在(001)方向的生长。
Abstract：Ettringite is a main product of sulphur aluminate cement hydration, and it has a more significant influence on the performance of cement and concrete. The formation conditions of ettringite affects its morphology. In this work, ettringite was synthesized by a chemical method. The influence of synthesis conditions on the formation and morphology of ettringite was investigated. The results show that the morphology of ettringite and the length-width ratio are significantly different due to the use of different synthetic materials. The formation of ettringite can be promoted at elevated temperature. Ettringite can be formed at 80 ℃ and shows lots of morphologies. Ettringite is unstable at 100 ℃. The length-width ratio of ettringite decreases with the increase of solution p H value. Boric acid inhibits the growth of ettringite in the(001) direction.
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基本信息:
DOI：10.14062/j.issn.0454-5648.2017.05.05
中图分类号:TQ172.1
引用信息:
[1]张文生,张金山,叶家元,等.合成条件对钙矾石形貌的影响[J].硅酸盐学报,2017,45(05):631-638.DOI:10.14062/j.issn.0454-5648.2017.05.05.
基金信息:
国家自然科学基金(51102222);; 国家重点研发计划(2016YFB0303504)资助
2017-04-21
2017-04-21
2017-04-21