Abstract
The optimal mix ratio of nano-silica aerogel foam concrete was determined through preliminary design and orthogonal experiment optimization. Based on the design of the size, reinforcement, and interface form of the prefabricated wallboard, a prefabricated foam concrete wallboard which met the requirements for use in the cold region (B region) of China was developed. The dry bulk density, thermal conductivity, compressive strength, and porosity were tested respectively. Besides, the microscopic characteristics of the foam concrete were tested through scanning electron microscopy(SEM). The thermal characteristics of the wallboard were tested under steady-state and unsteady-state conditions. The heat transfer coefficient is 0.5518 W/(m2·K) under steady-state conditions. The test results are that the temperature amplitudes of the inside and outside wall surfaces are 5.2℃ and 0.054℃ respectively, the temperature attenuation multiple and attenuation coefficient are 96.3, 0.0104, The delay time of the wall surface is up to 11.8 h, the heat storage coefficient of the surface is 2.48 W/(m2·K), thermal inertia index is 4.15, tested by using self-designed test device, and the periodic variation of sol–air temperature of Xuzhou area in summer is taken as boundary conditions. It shows that the developed wallboards have good thermal characteristics.
Published Version
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