Plancher Lionel, Pierre Alexandre, Nguyen Giao T M, Hébert Ronan L, Ledésert Béatrice A, Di Martino Patrick, Mélinge Yannick
Laboratoire L2MGC, CY Cergy Paris University, 95031 Neuville sur Oise, France.
Laboratoire LPPI, CY Cergy Paris University, 95031 Neuville sur Oise, France.
Materials (Basel). 2021 Dec 21;15(1):20. doi: 10.3390/ma15010020.
Nowadays, thermal regulation of the indoor environment is mandatory to reduce greenhouse gas emissions. The incorporation of Phase Change Materials (PCMs) and especially solid-solid PCMs (s/s PCMs) into building materials can be a major step forward in reducing energy consumption. Such materials are used for their high latent heat to save and release heat during phase change. To integrate these products in the fabrication of cementitious materials, it is essential to predict their influence on the rheological behaviour of construction materials. In this work, rheological measurements were carried out on composite suspensions made of cement or mortar plus s/s PCMs. Results showed that the fitting of the Herschel-Bulkley model with a constant value of flow exponent was reliable. The s/s PCMs influenced the consistency and the yield strength values, with the yield strength value being only slightly affected. The adaptation of an existing viscosity model is proposed to predict the consistency value of suspensions. Finally, an innovative approach to predict the flow behaviour is proposed and we highlight the research needs to mainstream the use of s/s PCMs in construction materials.
如今，室内环境的热调节对于减少温室气体排放是必不可少的。将相变材料（PCM），尤其是固-固相变材料（s/s PCM）掺入建筑材料中，可能是在降低能源消耗方面向前迈出的重要一步。此类材料因其高潜热而被用于在相变过程中储存和释放热量。为了将这些产品整合到胶凝材料的制造中，预测它们对建筑材料流变行为的影响至关重要。在这项工作中，对由水泥或砂浆加s/s PCM制成的复合悬浮液进行了流变学测量。结果表明，采用恒定流动指数的赫谢尔-巴克利模型进行拟合是可靠的。s/s PCM影响了稠度和屈服强度值，但屈服强度值仅受到轻微影响。建议采用一种现有的粘度模型来预测悬浮液的稠度值。最后，提出了一种预测流动行为的创新方法，并且我们强调了将s/s PCM用于建筑材料的主流应用所需开展研究的方向。
