Aggregates make up some 60 -80% of the concrete mix. They provide compressive strength and bulk to concrete. Aggregates in any particular mix of concrete are selected for their durability, strength, workability and ability to receive finishes.

The main aim of the concrete mix design is to find out the desired proportion of each ingredients which are cement, coarse aggregate, fine aggregate, water etc. to obtain the required properties of resulting mix.

at 28 Days psi Class A concrete shall be used for concrete structures, either reinforced or non-reinforced, and for concrete pavements. Class B concrete may be used for curbs, gutters and sidewalks. Class C concrete may be used for thrust blocks, encasements, fill or Page 2 SECTION 725 725-2 over-excavation, etc.

In terms of the ratio for concrete, it depends on what strength you are trying to achieve, but as a general guide a standard concrete mix would be 1 part cement to 2 parts sand to 4 parts aggregates. For foundations, a mix of 1 part cement to 3 parts sand to 6 parts aggregates can be used.

M20

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• Ambuja Plus Roof Special Cement.
• Shree Roofon Concrete Master Cement.
• RAMCO Supercrete.
• ACC Concrete+ Xtra Strong.
• Wonder Cement PPC.
• Binani Pozzolana Portland Cement (PPC)
• RAASI Concrete from India Cements.
• MyCem Concrete Max.

Benefits. Ordinary cement particles allow seepage of water and chloride, making a structure weak from inside. With the unique Void Reduction Technology, Duraguard increases the strength and density of concrete and stops the attack of harmful elements.

PPC produces highly durable concrete as it has low water permeability compared to OPC. PPC has low initial setting strength compared to OPC but hardens over a period of time with proper curing. And PPC is cheaper also compared to OPC.

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• Ultratech Cement.
• Ambuja cement.
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• JK Cement.

Concrete is rated on a system that indicates the strength of the mix after it’s cured for approximately a month. To make the concrete stronger, add more cement or less sand. The closer you bring the ratio to an even one-to-one of sand to cement, the stronger the rating becomes.

For the masonry of exterior walls with hard brick one often uses 1 part cement, 3.5 parts sand, 0.25 part lime. While for the same job, but with much softer limestone, a completely different mixing ratio is advised, namely 1 part cement, 9 parts sand, 2 parts lime.