2022 Volume 76 Issue 1 Pages 268-274
In this study, material analysis of sand plaster and lime concrete excavated from the former Niratsuka Silk Mill was conducted to investigate the material composition and hardening mechanism of lime-based materials. As a result, the sand plaster consisted of plaster and fine aggregate, and the chemical composition of the plaster part was almost exclusively CaCO3. The binder part of the lime concrete had binding water, suggesting the presence of C-S-H with solid solution of Al2O3 and aluminate hydrates by pozzolanic reaction. The use of Asama A pumice （As-A） was inferred for the lime concrete. The calcium hydroxide and As-A paste samples were confirmed to be hardened, and hydrocalumite and hydrotalcite were formed as hydrates in the hardened products.
