The Effect of Relative Humidity on the Performance of Lime-Pozzolan Mortars
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 development of compressive strength of the specimens was determined at preset time periods, from 7 days to 1 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 work in the field are addressed.
KeywordsCompressive Strength Hydrated Product Calcium Silicate Hydrate Strength Development Calcium Aluminate
- 3.EN 1015-3.: Methods of test for mortar for masonry – Part 3: Determination of consistence of fresh mortar (by flow table), European Committee for Standardization (1999)Google Scholar
- 4.EN 169-1.: Methods of testing cement – Part 1: Determination of strength, European Committee for Standardization (1995)Google Scholar
- 12.EN 1015-18.: Methods of test for mortar for masonry – Part 18: Determination of water absorption coefficient due to capillary action of hardened mortar. European Committee for Standardization (2002)Google Scholar