(1) Cementitious materials
The cementitious materials used to build the mortar are cement and lime.
The choice of cement type is the same as that of concrete. The cement label should be 4-5 times of the mortar strength grade. If the cement label is too high, the cement dosage will be insufficient and the water retention will be poor. Lime paste and slaked lime are not only used as a cementitious material, but more importantly, the mortar has good water retention.
(2) Fine aggregate
The fine aggregate is mainly natural sand, and the prepared mortar is called ordinary mortar. The clay content in the sand should be no more than 5%; strength, etc.
When the grade is less than M2.5, the clay content should be no more than 10%. The maximum particle size of the sand should be less than 1/4-1/5 of the thickness of the mortar, generally not more than 2.5 mm. As the mortar for jointing and plastering, the maximum particle size does not exceed 1.25 mm, and the thickness of the sand has a great influence on the amount of cement, workability, strength and shrinkage.
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