Correlation of initial and final available lime, and free water in lime putties to carbonation rate and mechanical characteristics of lime mortars

Abstract eng:
In conservation practice it is usually observed that the capability of upgrading the characteristics of a lime through maturation appears to be limited due to a self-drying mechanism. Within the general framework of research on high calcium limes suitable for repair mortars, samples of fresh wet slaked lime putties were simply stored undisturbed in plastic bags and carefully monitored for two years. The present paper investigates how the differentiation of the available lime and free water during maturation is related to the carbonation rate and mechanical characteristics of repair lime mortars. TGA-DTA results in mortars indicate that the degree of conversion of calcium hydroxide into carbonate is more likely related to the dynamic available lime (influenced by maturation). The initial available lime (controlled by calcination) is the key factor-affecting mechanical characteristics, mainly the compressive strength.

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