Microstructure and application study of secondary calcined lime as consolidant for cultural relics

On the basis of study on microstructure of secondary calcined lime,this paper probes into applications of secondary calcined lime in conservation of cultural relics.SEM observations show that Ca(OH)2 is transformed into a kind of acicular CaO with diameter 50 nm and length 200 nm after being calcined,and this nanosized secondary CaO is transformed into an oval platelike Ca(OH)2 with size 200-300 nm after slaked.Meanwhile,research results indicate that nanosized particles and high reactivity of secondary calcined lime are responsible for superior properties of sticky rice-lime mortar and high permeability of Ca(OH)2-alcohol dispersions,and it is feasible that secondary calcined lime is used for consolidation of soil,stone and brick-based cultural heritage.