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Using silicon carbide to increase thermal conductivity of cement composite for improving heating efficiency of floor heating system

2022; Elsevier BV; Volume: 325; Linguagem: Inglês

10.1016/j.conbuildmat.2022.126707

1879-0526

Yinfei Du, Wei Huang, Mingxin Dai, Weizheng Liu,

Advanced ceramic materials synthesis

In this paper, up to 60% (mass ratio of cement) silicon carbide (SiC) was introduced into sulfoaluminate cement to prepare silicon carbide/cement-based composites (SiCCCs) for increasing the heating efficiency of floor heating system (FHS). After investigating the basic physical properties of SiC, the mechanical and thermal properties of SiCCCs were characterized through microstructure test, flexural/compressive strength test, thermal conductivity test and indoor water-bath heating test. The results showed that SiC was irregularly shaped and did not participate in cement hydration. SiCCCs had a feature of high-temperature resistance. Compared with control cement-based material (CCM), the 7-day compressive strength and thermal conductivity of SiCCCs increased by 31.2% and 170%, respectively. Indoor water-bath heating test revealed that SiCCCs could shorten the time by about 42.9% when the upper surface temperature rose from 0℃ to 30℃, and the heating efficiency could increase by 33.3%. This study indicates that SiC is a potential material to improve the heating efficiency of FHS. The results of this paper are significant to guide the preparation of cement-based composites with high thermal conductivity and strength.