The influence of calcitic filler in hydraulic lime mortars for use in high temperature & high humidity climatic conditions: A preliminary investigation

Abstract eng:
The widespread adoption of alternative binders are playing an increasing role in carbon dioxide (CO 2) abatement in green construction and the repair of traditionally built structures. Natural Hydraulic Lime (NHL) has better environmental credentials than Portland Cement (PC) due in part to its lower calcination temperature and its ability to absorb CO2 during carbonation. However, NHL is more sensitive to climatic conditions during the setting and hardening processes and this is especially pronounced in high humidity climates. It is well understood that high humidity environments create favourable conditions for the development of the products of hydration, but the carbonation reaction can reduce or become dormant due to high sustained moisture contents. Anecdotal evidence suggests that the addition of crystalline CaCO3 into hydraulic lime mortar mixes can enhance the carbonation reaction due to ‘seeding’ of the crystal architecture. This research assesses the influence of CaCO3 modification of NHL mortars subject to high humidity environments and investigates the subsequent effect on early development of various physical properties.

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