2018 Volume 72 Issue 1 Pages 418-424
Autoclaved lightweight concrete（ALC）is a building material with Tobermorite as the major constituent mineral, but when it is regarded as a Xonotlite type, there is a possibility of becoming a building material superior with heat shrinkage characteristics. However, similar to ALC, bubbles are present, and hydrothermal synthesis method of Xonotlite using cement as a main raw material has not been established. In this study, we aimed to establish hydrothermal synthesis conditions of Xonotlite based lightweight cured body and to grasp the fundamental properties. As a result, it is shown that the CaO/SiO2 molar ratio of 1.0 was confirmed for the formation of Xonotlite. In case of autoclaving curing at 210℃ and 230℃, the tendency to transition to the Xonotlite with increasing autoclaving time was obtained. Additionally, the compressive strength decrease and drying shrinkage reduce with the improvement of production amount of Xonotlite.
