Masonry Magazine May 1964 Page. 13
Cement mixtures give reasons of product uniformity and one-bag material. However, very few of these proprietary cements have hydrated lime added to the mixture. The majority have approximately equal quantities of portland cement and finely ground limestone, with soaps, oils or earates added to make the mixture workable. Limestone, unlike hydrated lime, is inert, like fine sand, and has no cementitious value.
Lime is cementitious, giving strength to the mortar in the process of "drying-out", or recarbonating. This slow process of absorbing carbon dioxide from the air reverts the lime back to limestone.
Lime contributes to good mortar through its ability to have workability. It makes the mortar highly plastic. Joints are refilled without undue effort. High lime mortars hold moisture and resist the absorption of the moisture by the masonry units. The mortar will not "pancake", leading to poor bond and leaky walls. It reduces the need for re-tempering, a distinct construction advantage. The extreme fineness of lime, and its plate-like structure let a high lime mortar stick readily to the masonry units, flow into minute.
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MASONRY May, 1964 13