Effect of Silica Fume on Properties of Ultra-Light Cement-Based Composite Thermal Insulation Materials

Abstract

Abstract: In this paper, using the cement as the cementing material, expanded polystyrene foam (EPS) particles, admixture, foams and modifiers, water and others as the main raw materials, using physical foaming process to prepare the ultra-light cement-based composite thermal insulation materials (UCIM). UCIM was composed of EPS particles and foamed concrete matrix through interpenetrating, after different kinds of admixtures were equivalent to replace cement, the inclusion of cement paste on EPS particles was affected to different degrees, so that the uniformity of UCIM structure and product properties were affected. Through the design of different amounts of admixtures, the uniformity and strength of UCIM prepared by silica fume, metakaolin and mineral powder were compared. The results show that there is no delamination and segregation phenomenon, and the strength test results of UCIM are good when silica fume is used. And by photographing micropore, testing strength and thermal performance, the effect of the silica fume content on the pore structure, strength and thermal conductivity of foamed concrete matrix in UCIM was studied systematically. The results show that the appropriate amount of silica fume improves the mechanical properties of UCIM, and reduces the average pore size of foamed concrete matrix in UCIM, which is beneficial to reduce the thermal conductivity of UCIM.

Key words: ultra-light cement-based composite thermal insulation material, silica fume, uniformity, pore structure, strength, thermal conductivity

CLC Number:

TU528.2

WU Zihao, WANG Wuxiang, LIU Xiaotong, WANG Aijun, ZHANG Leilei, YANG Jun. Effect of Silica Fume on Properties of Ultra-Light Cement-Based Composite Thermal Insulation Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(12): 4030-4036.

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