硅酸盐水泥
胶凝的
水泥
润湿
水合物
解吸
收缩率
相对湿度
材料科学
铝酸盐
水合硅酸钙
肿胀 的
吸水率
化学工程
相(物质)
湿度
复合材料
化学
吸附
热力学
物理化学
有机化学
工程类
物理
作者
Luis Baquerizo,Thomas Matschei,Karen Scrivener,Mahsa Saeidpour,Lars Wadsö
标识
DOI:10.1016/j.cemconres.2015.02.011
摘要
The AFm phase, one of the main products formed during the hydration of Portland and calcium aluminate cement based systems, belongs to the layered double hydrate (LDH) family having positively charged layers and water plus charge-balancing anions in the interlayer. It is known that these phases present different hydration states (i.e. varying water content) depending on the relative humidity (RH), temperature and anion type, which might be linked to volume changes (swelling and shrinkage). Unfortunately the stability conditions of these phases are insufficiently reported. This paper presents novel experimental results on the different hydration states of the most important AFm phases: monocarboaluminate, hemicarboaluminate, strätlingite, hydroxy-AFm and monosulfoaluminate, and the thermodynamic properties associated with changes in their water content during absorption/desorption. This data opens the possibility to model the response of cementitious systems during drying and wetting and to engineer systems more resistant to harsh external conditions.
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