Testing the freeze/thaw cycles in lime mortar

Abstract eng:
The purpose of this study is to evaluate the behaviour of lime mortars in cold climates, namely by the effect of freeze/thaw cycles. Twelve compositions of mortars were prepared varying the type of binder (air lime, hydraulic lime and air lime + cement), the grain size distribution of the sand and the use of an air entraining agent. Tests including the open porosity, mechanical strength and resistance to freeze/thaw cycles were conducted in order to evaluate the performance of lime mortars in cold climates. The analysis of results allowed to assess some relevant conclusions about the influence of the grain size of aggregate, the use of an air entraining agent and the behaviour of mortars with different types of binder. The open porosity depends mainly on the granulometry of sands while the mechanical strength is correlated with the binder type. These two characteristics have a great influence on the strength of mortar to freeze/thaw cycles and consequently on their performance in cold climates.

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