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Cement mortar is made of cement, fine aggregate and water, namely cement + sand + water, according to the needs of the mortar, cement mixed mortar is made of cement, fine aggregate, lime and water. The two are different concepts, different in name and use.
The so-called 1:3 cement mortar is compounded with 1 weight of cement and 3 weight of sand. In fact, the composition of water is neglected. Generally, it is about 0.6, that is, it should be 1:3:0.6, and the density of cement mortar is 2000Kg/ M3.
Note: The mortar used in the construction process is generally stirred on site for ease of construction. The ratio of cement mortar to 1:3 refers to the weight ratio, and then converted to the volume ratio according to the capacity of the on-site mixer or material container; used in structural construction. The mortar is mostly made of finished mortar, which is expressed by mortar strength, such as M5, M7.5, M10 mortar.