Effect of Water-Solid Ratio on Physical Properties of Tobermorite Type Thermal Insulation Materials

Abstract

Abstract In this paper, diatomite is used as the main raw material to prepare tobermorite type thermal insulation material. According to the characteristics of the reaction system, appropriate amount of waste aerated concrete is added to the raw materials. After adding crystal seeds into the reaction system, the crystal of the reaction products is more complete, the crystal grains are larger, and the degree of crystallization is higher. The maximum use temperature of the prepared tobermorite insulation material can reach 750°C - 850°C. If the service temperature continues to rise, the volume will shrink and cracks will easily occur, which is caused by the transformation of internal crystals. After studying the influence of water solid ratio of reaction system on the apparent density, thermal conductivity and flexural strength of samples, it can be seen that 300kg/m3 thermal insulation material can be prepared when the water solid ratio is 15:1. When the water solid ratio is 15:1, the thermal conductivity of the thermal insulation material is 0.077W/(m • K), and the flexural strength is about 0.384MPa.