. Cement-Lime-Sand Mortar
Often referred to as ‘compo’, this mix contains a proportion of hydraulic lime for a number of reasons. Lime contributes little in terms of strength but it does act as a plasticizer to make the mortar more workable. Lime also has good water-retaining properties, which means that the setting time of the mortar is slowed, with the mortar staying workable and keeping its plasticity for longer. The presence of lime renders the set mortar somewhat more flexible than sand-cement mortar, meaning that differential structural movement is more easily accommodated. The addition of lime also enhances the aesthetics of mortar by giving it a more creamy appearance.