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Hydration development and thermal performance of calcium sulphoaluminate cements containing microencapsulated phase change materials
Cement and Concrete Research ( IF 11.4 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.cemconres.2020.106039
Susana G. Sanfelix , Jesus D. Zea-García , Diana Londono-Zuluaga , Isabel Santacruz , Angeles G. De la Torre , Anna-Lena Kjøniksen

Abstract Microencapsulated phase change materials (MPCM) incorporated in buildings walls can reduce indoor temperature fluctuations, conserving energy and enhancing thermal comfort. MPCM were incorporated in calcium sulphoaluminate cement (CSA) at high concentrations to achieve a significant effect on the thermal properties. The cement hydration development was studied by isothermal calorimetry and laboratory X-ray powder diffraction (LXRPD). The hydration mechanism was not affected by the addition of MPCM. In order to obtain homogeneous mortars in the presence of MPCM, a superplasticizer (SP) was used. However, the SP causes a significant delay of the hydration. Although the mineralogical composition of the hydrated pastes did not change with the addition of MPCM, the mechanical strengths decrease dramatically. This decrease is well described by the Bolomey equation, assuming MPCMs act as air voids. This is a physical effect due to the high volume of MPCM, and not due to a change in the hydration chemistry.

中文翻译:

含微囊相变材料硫铝酸钙水泥的水化发展及热性能

摘要 在建筑墙体中加入微胶囊相变材料(MPCM)可以减少室内温度波动,节约能源并提高热舒适度。MPCM 以高浓度掺入硫铝酸钙水泥 (CSA) 中,以对热性能产生显着影响。通过等温量热法和实验室 X 射线粉末衍射 (LXRPD) 研究水泥水化的发展。水合机制不受添加 MPCM 的影响。为了在 MPCM 存在下获得均匀的砂浆,使用了超塑化剂 (SP)。然而,SP 会导致水合作用的显着延迟。尽管加入 MPCM 后,水合糊状物的矿物组成没有改变,但机械强度却急剧下降。假设 MPCM 作为空气空隙,Bolomey 方程很好地描述了这种减少。这是由于 MPCM 的高体积造成的物理效应,而不是由于水合化学的变化。
更新日期:2020-06-01
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