Grade of concrete is defined as the minimum strength the concrete must possess after 28 days of construction with proper quality control. Grade of concrete is denoted by prefixing M to the desired strength in MPa. For example, for a grade of concrete with 20 MPa strength, it will be denoted by M20, where M stands for Mix. This grade of concrete is converted into various mix proportions. For example, for M20 concrete, mix proportion will be 1:1.5:3 for cement: sand: coarse aggregates. Grade of concrete construction is selected based on structural design requirements.
Regular grades of concrete are M15, M20, M25 etc. For plain cement concrete works, generally M15 is used. For reinforced concrete construction minimum M20 grade of concrete are used.
As you see, concrete grades are divided into three categories:
• Normal concrete grade: Their compressive strength is relatively low and lies in the scope of 1,450 to 3,250 PSI. These are by and large used to develop asphalts, carport floors, and outer stopping that are normally non-primary.
• Standard concrete grade: The standard concrete grade category includes concrete grades between M25 and M45. It is used to build walls, loading bays, slurry pits, high-tensile beams, concrete girders, and walls, among other things.
• High strength concrete grade: Concrete with more than 50 MPa is classified under the high substantial grade. The construction of high-rise buildings and structures in the vicinity of water bodies is the primary application for the high concrete grade.
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Zist Yar Varena Company(Private Joint Stock Company) was established in 2014 and has started its activity in the field of production, research and development of modern concrete admixtures in the civil industry and It intends to take steps to improve the quality of concrete and move towards sustainable development by cooperating with the national and international researches and academic centers by using the latest technologies in the world.
