Cement mortar is composed of cement, fine aggregate and water (cement, fine sand and water) according to the proportioning requirements. When cement mortar is used, some additives are often added, such as microfoaming agent, waterproof powder, etc., to improve its workability and viscosity.
In construction projects, it is used for foundation and wall masonry, as a binder for block masonry materials, such as masonry, red brick, etc.. Also, it is used for indoor and outdoor plastering.
Generally speaking, 1:3 cement mortar is made of 1 weight of cement and 3 weights of sand. In fact, the composition of water is ignored. Generally, the ratio is about 0.65. That is, it should be 1:3:0.65. The density of cement mortar is 2000Kg/ m3.
The mortar used in the construction process is generally mixed on site for the convenience of construction. The cement mortar mix ratio of 1:3 refers to the volume ratio, and then converted into a weight ratio according to the capacity of the on-site mixer or material container; Mortar is mostly used finished mortar, and it is mostly expressed by mortar strength. According to the strength grades, cement mortar can be divided into: M5, M7.5, M10, M15, M20, M25, M30, etc.
Note: Mixed mortar is made up of cement, fine aggregate, lime and water, according to needs. The two are different concepts with different names and different uses.
Factors Affect The Strength Of Cement Mortar
When the quality of raw materials is constant, the strength of mortar is related to the type (label) and amount of cement.
- Sand and external additives
- Incorporation of mixed materials
- Masonry and maintenance conditions
- Mud and other impurities content
Properties of Cement Mortar
The workability of mortar refers to whether the mortar can be laid in a uniform and continuous thin layer on the surface of masonry and other surfaces, and the properties of which are closely bonded to the base layer, including fluidity and water retention.