The difference in behaviour between calcitic and dolomitic lime mortars set under dry conditions: The relationship between textural and physical-mechanical properties

Differences in the texture, mineralogy, hygric and mechanical properties of mortars prepared with dry hydrated limes of calcitic and dolomitic composition are investigated in this work. Special attention is given to the influence of the lime microstructure and the mortars curing condition. The effect of using two different aggregates (natural and crushed of calcitic and siliceous composition) is also examined. Results showed that the use of dolomitic lime is not recommendable if mortars are applied in dry areas since, under these conditions, a great shrinkage occurs and no strength improvement is induced. Moreover, dolomitic mortars presented a pore network that negatively affects the water transfer properties. On the contrary, calcitic mortars present higher carbonation degree and better physical-mechanical properties. Finally, the use of a calcareous aggregate is preferred because it produces better cohesion in the mortar. (C) 2012 Elsevier Ltd. All rights reserved.