Abstract
The effect of lime characteristics and hot lime mix method on hydraulic, microstructural and mechanical properties of mortars is determined by producing mortars from quicklimes of two different marbles and two limestones. Results of SEM-EDS, XRD and TGA analyses reveal that the porous microstructure of mortars and spongy texture of calcite crystals are the indicators of the hot lime mix method. This study shows that characteristics of limestones used for the production of limes, as well as the preparation method, directly affect hydraulic, mechanical and microstructural properties of mortars.
Highlights
Lime has been the most frequently used traditional material in construction works for more than three thousand years [1]
Lime was produced using two different marbles, white limestone and grey limestone containing diatoms, so that it can be used in mortar preparation by the hot lime mix method
Mortars based on calcined grey limestone containing high amounts of diatoms exhibited relatively high compressive strength compared to other mortars due to formation of dicalcium silicate at relatively low temperature (850°C)
Summary
Lime has been the most frequently used traditional material in construction works for more than three thousand years [1]. Non-hydraulic limes are mainly composed of calcium oxide and magnesium oxide added in different ratios They harden through a carbonation reaction by absorption of CO2 from the air. Studies concerning traditional lime mortar production generally focus on the effects the lime-aggregate ratio, type of aggregate, and curing time, have on carbonation, mechanical strength, physical properties, microstructural properties, mineralogical composition, and chemical composition of lime mortars produced in laboratory conditions [13,14,15,16,17,18,19]. The aim of this study is to identify the effects of lime characteristics on the hydraulic, microstructural and mechanical properties of mortars prepared by quicklime and aggregates (hot lime mix). The results of this study could guide the selection of limestones to be used for the production of intervention mortars in the restoration of historic buildings
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