- RMC is ready to use the material for concrete which is a mixture of cement, sand, aggregates, and water.
- The idea of RMC was first introduced in the year 1903 by an Architect Jurgen Heinrich Magens from Germany.
- In 1907 they discovered that RMC available time can be prolonged by cooling and vibrating it during the transportation.
- In INDIA RMC was used in 1950 in the construction of Dams like Bhakra Nangal and koyna.
- High-quality concrete is produced.
- Elimination of storage space for materials like cement, Sand, and aggregate.
- Eliminate the hiring of plant and labors for making concrete.
- Wastage of basic material is avoided.
- The time required is greatly reduced.
- Noise and Dust pollution is reduced at the site.
Materials Required for Manufacturing RMC:
- Aggregate is an important material in the manufacture of concrete. This gives the body to the concrete mixture 70 – 80 % of the concrete.
Based on the size the aggregate is divided into two categories.
- Coarse aggregate. (Size more than 4.75mm are coarse aggregate)
- Fine aggregate. (Size less than 4.75mm are fine aggregate)
- Cement is a binder material which setsand hardens independently and binds other material together.
- Sand some amount of sand and Water is also added to the mixture and concrete is produced.
- Transit Mixed or Truck mixed concrete.
- Shrink Mixed concrete.
- Central-mixed concrete.
Transit Mix or Truck Mixed
- In this, all the materials along with water are added in the tuck mixture.
- While traveling to the job site the drum rotates slowly and while arriving at the job site the concrete is completely mixed and ready to use.
- Concrete mixed in the yard the drum is turned at high speed at 12 – 50 RPM for 50 Revolution. The concrete is slowly aggregated while traveling to the job site.
- Concrete mixed in transmit the drum is turned at medium speed or above 8 rpm for 70 revolutions while driving to the job site.
Time in Transport:
- In general, the Truck should deliver the concrete in two hours of time.
- However, this period can be prolonged by using admixtures or in the cool.
Sampling and Testing for Ready-mix Concrete:
- As per IS 4926 – 2003 the point and time of sampling shall be at the distance from the discharge from the producers delivery vehicle or from the mixture to the site.
In Bangalore Tavara Mines and Mineral are manufacturing and supplying high-quality M Sand and RMC.