RMC

Ready Mix Concrete (RMC)

Ready Mixed Concrete (RMC) is a primary material used in buildings and heavy civil infrastructure projects. Projects ranging in size from a single house to high-rise buildings all need RMC for their construction. RMC consists of coarse aggregates, fine aggregates, cement, water, fly-ash and admixtures (specified).

It is a modern technique of production of concrete in massive quantities away from the actual site of placing. It is very useful where demand of concrete is very high and construction sites are in congested areas, where mixing on site is not possible due to lack of storage place. RMC is ready-to-use material widely adopted throughout the world. It provides higher strength and durability to the structure.

How Ready Mix Concrete (RMC) is made?

Ready Mix Concrete is made in batching plants. The main ingredients used to make RMC are Coarse Aggregates (Aggregates-20mm, Aggregates-10mm), Fine Aggregates (M-sand/Stone dust/ Crushed sand/ Coarse Sand), Cement, Fly ash, Admixture and Water. Coarse Aggregate and Fine Aggregates (M-sand/Stone dust/ Crushed sand/ Coarse Sand) work as filler material in ready mix concrete, while cement is binding material, water is used for hydration and admixture is added to increase the workability of concrete. Concrete batching plant process starts from the feeding of aggregates into individual bins. The aggregates are fed into bins according to their respective sizes. These aggregates will be weighed individually as per the design set in the control panel. After weighing, it will be transferred to the mixing unit. Above the mixing unit, the weighing hopper known as skip weighing bucket is placed to weigh ingredients and then transfer it to following mixing unit. Cement is transferred to the weigh hopper by means of screw conveyer whereas water is pumped into that hopper. As per the time set in the mixing unit, all the contents were mixed. Further, the mixer will discharge the prepared RMC into transit mixer.

Grades of Ready Mix Concrete (RMC)

Grade is defined as the minimum strength of concrete after 28 days of construction with proper quality control. Concrete grades are denoted by M-7.5, M-10, M-15, M-20, M-25, M-30, M-35 and M-40 according to their compressive strength. M denotes Mix design of concrete followed by the compressive strength number in N/mm². Mix is the respective ingredient proportions which are cement, fine aggregates and aggregate.

GROUP	CONCRETE GRADE	MIX RATIO	COMPRESSIVE STRENGTH
ORDINARY CONCRETE	M-7.5	1:4:8	7.5 N/mm2
	M-10	1:3:6	10 N/mm2
	M-15	1:2:4	15 N/mm2
	M-20	1:1.5:3	20 N/mm2
STANDARD CONCRETE	M-25	1:1:2	25 N/mm2
	M-30	Design Mix	30 N/mm2
	M-35	Design Mix	35 N/mm2
	M-40	Design Mix	40 N/mm2

As per IS 456:2000 the grades less than M-20 should not be used in RCC works. The minimum grade of concrete for Plain Cement Concrete (PCC) is M-15 whereas for Reinforced Cement Concrete (RCC) is M-20 which is used for construction of roof slab. M-7.5 is used in PCC work as in the base under the foundations.

Ready Mix Concrete is delivered in two ways:

1. NOMINAL MIX: The nominal mixes are those mixes whose grades are up to M-25. These are generally used for small-scale construction where concrete consumption is not so high.
2. DESIGN MIX: The design mix concretes are those whose mix ratio proportions are obtained from various lab tests while considering various process in concreting, properties of concrete and quality of material used for preparation of concrete. The grades of concrete M-30 and above are design mixes. It is generally used for the construction of large structures

Advantages of Ready Mix Concrete (RMC)

• ✓It allows speedy construction through programmed delivery at site, mechanized operation with the acceptable economy.
• ✓The usage of RMC reduces the labor cost and site supervising cost.
• ✓The concrete is produced in controlled conditions. So, consistency in the quality of concrete is maintained through accurate and computerized control of cement, aggregates and water as per mix designs.
• ✓In the production of RMC bulk cement is used instead of bagged cement. So, RMC also helps in minimizing cement wastage due to bulk handling.
• ✓The production RMC is pollution-free process.
• ✓Also, its usage reduces the construction project time which ultimately results in saving all aspects.
• ✓As the raw materials are used in specific proportions hence leading to less wastage, hence it helps in preserving natural resources.
• ✓It is cheaper than nominal mix because of less consumption of cement in its production. Its transportation and placing is very easy.

Hence the advantages of RMC are realized by engineers and contractors in construction industry. So, it is widely used.

Final Words

The varied range of ready mix concrete can a lot of benefits to construction work. You can get the concrete that will be giving the excellent durability. We the best Building Materials Suppliers in Gurgaon, Delhi NCR make sure that you will get best quality of RMC in Gurgaon, Delhi NCR on time at affordable prices