The effect of relative humidity on the performance of lime-pozzolan mortars

Abstract eng:
The development of strength in conservation mortars is of particular significance for new synthesized lime-based mixtures, in terms of practical application, performance requirements and renovation cost of built monuments. In this work, the effect of relative humidity (RH %) on the strength characteristics of lime-natural pozzolan mortars was studied, in three groups of specimens, cured at different humidity conditions (45, 65 and 95 RH %). The compressive strength of the specimens was determined at preset time periods, from 7 days to one year. At the same time periods, the setting products and the microstructure of the mortars were monitored by thermal analysis (DTA/TG) and scanning electron microscopy (SEM/EDX). The results highlight the beneficial effect of elevated humidity on the strength of lime-pozzolan mortars and at the same time some issues related to the reliability and reproducibility of laboratory performance in field works are addressed.

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