Ready Mix Concrete by Parth ShahTo: Prof. Prasad GharatBy: Parth Shah

Ready Mix Concrete Popularly known as RMC is manufactured at a factory or at a

batching plant and transported in a transit mixer at the site It is freshly mixed and custom made to suit different

applications and volume is expressed in cubic meters. Price of RMC varies from Rs.3500-5500 depending upon the

grade which ranges from M15-M45

Ready Mix Concrete by Parth Shah

Ingredients of ReadyMixConcrete

Ready Mix Concrete by Parth Shah

Ready Mix Concrete by Parth Shah

Types of Admixtures Admixtures Components Purpose

Accelerator Calcium carbonate Extreme climates

Retarder Sugar Climate above 50oCAir-Entrain Soap Water Water absorption

Plasticizers Liquid Admixtures To increase workability

Mineral additives Fly ash, Rice husk, silica fumes

Chemically inert and thermal insulators

Ready Mix Concrete by Parth Shah

Process to obtain RMC

• https://www.youtube.com/watch?v=IbihV2b6zf0

Ready Mix Concrete by Parth Shah

Slump Cone Test

• https://www.youtube.com/watch?v=rZP0e5ndRk4

Ready Mix Concrete by Parth Shah

Placing of Concrete

• https://www.youtube.com/watch?v=bXj_9vpfedE

Ready Mix Concrete by Parth Shah

Compressive Strength

• https://www.youtube.com/watch?v=QZSYS932_Lo

Ready Mix Concrete by Parth Shah

Advantages of RMC Assured And Uniform Quality Of Concrete Speedier Construction Through Mechanised Operations Need For Ordering And Storing Cement, Aggregates And

Sand On Site Totally Eliminated Lower Labour And Supervisory Costs Minimisation of cement wastage through bulk handling and

storage Cleaner working environment Eco-friendly product

Ready Mix Concrete by Parth Shah

Disadvantages Availability of suitable land in cities at reasonable price Sales tax / Vat on RMC Transportation bottlenecks (restricted hours) Cost comparison with site mixed concrete, while two products

are different Lack of codal provisions, specifications and regulations to

support RMC. Qualified and trained manpower

Ready Mix Concrete by Parth Shah

Quality Problems Delay in setting of concrete beyond 24 hours. Development of cracks when the concrete is still in fresh

state. Development of cracks in hardened concrete. Non-compliance of concrete cube strength (cast at site)

to specifications at 7-days. Non-compliance of concrete cube strength (cast at site)

to specifications at 28-days. Concrete supplied to site either has more slump than

specified or has become stiff making it difficult to pump.

Ready Mix Concrete by Parth Shah

Status of RMC in IndiaGeographical Distribution No.Of Plants

2001-2002 2004-2005

Bangalore-Mysore Belt 12 35

Chennai-Trichannapali 8 25

Hyderabad-Vizag 6 12

Pune 2 10

Mumbai, Navi Mumbai 12 25

Goa 1 2

Delhi,Gurgaon,Faridabad 5 25

Kolkatta 1 3

Ahemdabad, Surat - 3

Jaipur - 2

Sundry - 5

Total 47 147

Ready Mix Concrete by Parth Shah

References

• https://www.youtube.com/watch?v=rZP0e5ndRk4• https://www.youtube.com/watch?v=QZSYS932_Lo• https://www.youtube.com/watch?v=bXj_9vpfedE• https://www.youtube.com/watch?v=IbihV2b6zf0• http://elearning.vtu.ac.in/12/enotes/

Adv_Conc_Stru/Unit5-RVR.pdf

Ready Mix Concrete by Parth Shah