Concrete grade: M25, M20, M15, M10 & M7.5, meaning, their uses & mix ratio | Uses & mix ratio of M20 grade of concrete | Uses & mix ratio of M25 grade of concrete | Uses & mix ratio of M15 grade of concrete | Uses & mix ratio of M10 grade of concrete | Uses & mix ratio of M7.5 grade of concrete.
Portland cement is used to mix with Sand, aggregate, and water with approved ingredients to form concrete. Concrete is a basic material used for all types of construction, including housing, roads, bridge, dams, schools, hospitals, dams and ports, as well as for decorative applications for patios, ramp, floors, staircases, driveways, and pool decks.
Proportion of concrete mix i.e. ratio of cement, sand, aggregate and water determine the strength of concrete. Test for compressive strength is carried out either on cube or cylinder. Cylinder test is carried on 15cm dia & 30cm Length cylinder and Cube test with 15cm × 15cm × 15cm cube @28 Days curing.
In M25 concrete grade, M refers to concrete mix, and 25 number indicates its characteristics of compressive strength (fck) @28 Days curing that is 25MPa when tested with 15cm × 15cm × 15cm cube. In M20 concrete grade, their fck value is equal to 20 N/mm^2. In M15 concrete grade, their fck value is equal to 15 N/mm^2. In M15 concrete grade, their fck value is equal to 15 N/mm^2. In M10 concrete grade, their fck value is equal to 10 N/mm^2.
Compressive strength of concrete will depend on many factors such as Grade of cement, strength of cement, water-cement ratio, quality of concrete material, size of Sand and aggregate, quality control during production of concrete etc.
In this article we know about what are the different uses of different grade of concrete i.e M25, M20, M15, M10 & M7.5. M25 and M20 grade of concrete is medium strength concrete used along with rebar to strengthen the tensile strength in slabs, beam and column casting. While M15, M10 & M7.5 are low strength concrete used for PCC work i.e making footpath, PCC Road’s, floor, garage floor, sidewalk, ramp, etc.
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Uses and mix ratio of M25 grade of concrete
M25 concrete grade means, M refers to concrete mix, and numerical figure 25 represents its characteristics of compressive strength (fck) @28 Days curing that is 25MPa when tested with 15cm × 15cm × 15cm cube. It is prepared by taking mix ratio 1:1:2 (1 cement : 1 Sand : 2 Aggregate).
The typical concrete mix ratio for making M15, M20 and M25 concrete is (cement : sand : stone): 1:2:4, 1:1.5:3 and 1:1:2 respectively according to volumetric analysis.
The common concrete mix ratio to create M25 grade of concrete is 1:1:2 (cement: Sand: Stone) by volumetric analysis. This means, 1 bucket of Portland cement mix with 1 bucket of Sand and 2 bucket of Aggregate which yields approximately 2 1/2 buckets after batching.
M25 grade of concrete are used in heavy loaded RCC work, commercial and industrial building, rigid Pavement Construction, used to construct structural members like slabs, beams, columns, etc. It is usually preferred for construction of high rise building i.e. 3 or 4 storey building to resist high range loads.
Uses and mix ratio of M20 grade of concrete
M20 concrete grade means, M refers to concrete mix, and numerical figure 20 represents its characteristics of compressive strength (fck) @28 Days curing that is 20MPa when tested with 15cm × 15cm × 15cm cube. It is prepared by taking mix ratio 1:1.5:3 (1 cement : 1 1/2 Sand : 3 Aggregate).
The common concrete mix ratio to create M20 grade of concrete is 1:1.5:3 (cement: Sand: Stone) by volumetric analysis. This means, 1 bucket of Portland cement mix with 1 1/2 bucket of Sand and 3 bucket of Aggregate which yields approximately 3 1/2 buckets after batching.
M20 grade is medium strength concrete is generally used for RCC work of residential building i.e. slab, beams, column, foundation, and retaining wall. It is usually preferred for RCC (reinforced cement concrete) work, construction of low rise building i.e. one or two storey building to resist medium range loads.
Uses and mix ratio of M15 grade of concrete
M15 concrete grade means, M refers to concrete mix, and numerical figure 15 represents its characteristics of compressive strength (fck) @28 Days curing that is 15MPa when tested with 15cm × 15cm × 15cm cube. It is prepared by taking mix ratio 1:2:4 (1 cement : 2 Sand : 4 Aggregate).
The common concrete mix ratio to create M15 grade of concrete is 1:2:4 (cement: Sand: Stone) by volumetric analysis. This means, 1 bucket of Portland cement mix with 2 buckets of Sand and 4 bucket of Aggregate which yields approximately 4 1/2 buckets after batching.
M15 grade is low strength concrete is generally used for Non-RCC work, it is used for PCC, levelling of footing beds, retaining wall, floor slab, ramp, making footpath, PCC Road’s for small vehicle, garage and workshop floor, etc. In low scale for construction of one storey building, it is also used as RCC i.e. for Slab, Beam, Column, Stair, etc. Also used for a load-bearing structure like water tank stain.
Uses and mix ratio of M10 grade of concrete
M10 concrete grade means, M refers to concrete mix, and numerical figure 10 represents its characteristics of compressive strength (fck) @28 Days curing that is 10MPa when tested with 15cm × 15cm × 15cm cube. It is prepared by taking mix ratio 1:3:6 (1 cement : 3 Sand : 6 Aggregate).
The common concrete mix ratio to create M10 grade of concrete is 1:3:6 (cement: Sand: Stone) by volumetric analysis. This means, 1 bucket of Portland cement mix with 3 buckets of Sand and 6 bucket of Aggregate which yields approximately 6 1/2 buckets after batching.
M10 grade is low strength concrete is generally used for Non-RCC work, making footpath, PCC Road’s for small vehicle, garage and workshop floor, storage shed, animals shed, cover slab of single room for domestic animals, for Supportive foundation, and used for PCC floor where movement of load mostly occurs.
Uses and mix ratio of M7.5 grade of concrete
M7.5 concrete grade means, M refers to concrete mix, and numerical figure 7.5 represents its characteristics of compressive strength (fck) @28 Days curing that is 7.5MPa when tested with 15cm × 15cm × 15cm cube. It is prepared by taking mix ratio 1:4:8 (1 cement : 4 Sand : 8 Aggregate).
The common concrete mix ratio to create M7.5 grade of concrete is 1:4:8 (cement: Sand: Stone) by volumetric analysis. This means, 1 bucket of Portland cement mix with 4 buckets of Sand and 8 bucket of Aggregate which yields approximately 8 1/2 buckets after batching.
M7.5 grade is low strength concrete is generally used for Non-RCC work, it is used as lean concrete. Its main application is to provide uniform surface for the foundation which prevent the foundation from direct contact of soil.
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Conclusion:
M25 concrete grade means, M refers to concrete mix, and numerical figure 25 represents its fck @28 Days curing. The common concrete mix ratio to create M25 grade of concrete is 1:1:2 (cement: Sand: Stone) by volume, which is used in heavy loaded RCC work, commercial and industrial building, rigid Pavement Construction, high rise building, etc.