ABSTRACT
This chapter focuses on the investigation and assessment of the benefits of hydrated lime additions to cement based mortars in respect of mortar freeze-thaw durability. The addition of lime into cement based mortars has been to provide better "workability" of the mortar in the fresh state, thus providing an easier material for the brick layer or stone layer to work with. The addition of lime is known to impact both the mortar in the fresh state as well as the hardened state, such as the pore structure and it's connectivity, rendering some protection to the action of frost on the mortar, especially when saturated. In some respects, lime additions can be viewed as a "natural mineral based" alternative to the chemical addition, that impact upon the water retention properties and the development of air entrainment in the fresh state mortar.
