SiC对水泥基材料传热效率及力学性能的影响  

Influence of SiC on heat transfer efficiency and mechanical properties of cement-based materials

作　　者：杜银飞 黄伟[1] 代明欣 马聪 郭辉 DU Yinfei;HUANG Wei;DAI Mingxin;MA Cong;GUO Hui(School of Civil Engineering,Central South University,Changsha 410075,China;Institute of Urban Intelligent Transportation and Safety Operation and Maintenance,Shenzhen University,Shenzhen 518061,China;Shandong Binzhou Highway Engineering Co.Ltd.,Binzhou 256600,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]深圳大学城市智慧交通与安全运维研究院,广东深圳518061 [3]山东省滨州公路工程有限公司,山东滨州256600

出　　处：《中南大学学报（自然科学版）》2023年第5期1730-1738,共9页Journal of Central South University:Science and Technology

基　　金：国家重点研发计划项目(2021YFB2601000);国家自然科学基金资助项目(51808562);湖南省自然科学基金资助项目(2020JJ5723);中央高校基本科研业务费专项资金资助项目(2021zzts0756)。

摘　　要：为了提高地暖系统(FHS)的传热效率以减小供暖能耗,采用不同掺量的SiC作为高导热掺合料制备FHS回填层复合水泥基材料(CCMs),并通过微观结构分析、热稳定性、抗压/抗折强度、导热系数测试以及室内水浴传热试验表征CCMs的力学性能与热性能。研究结果表明:SiC具有锋利的棱角以及光滑的表面纹理,被水化体系包裹后,其结构完整性以及分散性较好,不发生新的化学反应;随着SiC掺量的增加,在CCMs的水化体系中出现更多的大孔隙与界面过渡薄弱区域,且CCMs的水化受抑制程度也随之增强,同时,抗压/抗折强度均呈现先增大后降低的趋势;SiC的引入对CCMs的热稳定性以及导热性能具有积极作用,导热系数最大可提高140.8%,并使热损失率减小约6%;水浴传热模拟结果也证实,SiC掺量越高则上述作用越强,计算的传热效率最大可提高23.6%。In order to improve the heating efficiency of floor heating system(FHS) for reducing heating energy consumption,different contents of SiC were used as admixture to prepare cement-based composites materials(CCMs) used in the filling layer of FHS.The mechanical and thermal properties of specimens were characterized by microstructure analysis,thermal stability,compressive/flexural strength,thermal conductivity and indoor waterbath heating test.The results reveal that SiC has smooth textures and is irregularly shaped,and it is wrapped by hydration products with good dispersion and structural integrity.The introduction of SiC does not produce new chemical reactions.With the increase of SiC content,more macro-pores and weak areas are found in the hydration system,accompanied with reducing cement hydration degree.The compressive and flexural strength of CCMs increase firstly and then decrease with the increasing content of SiC.The introduction of SiC leads to better thermal stability and higher thermal conductivity of CCMs.Compared with control group,the maximum thermal coefficient of CCMs can be increased by 140.8%,and heat loss rate within the FHS operating range can be reduced by nearly 6%.The simulation heating efficiency of FHS is improved with increasing SiC content,and the heating efficiency can be improved by up to 23.6%.

关 键 词：地暖系统 SIC 微观结构 热性能 力学性能 传热效率 

分 类 号：TU528[建筑科学—建筑技术科学]