READY MIX CONCRETE (RMC)

transcript

BY ASHUTOSH SINGH B.TECH CIVIL( 3 R D Y E A R )

201410105110089

CONTENT• INTRODUCTION

• HISTORY

• DEVELOPMENT IN INDIA

• SCOPE

• RAW MATERIAL

• MANUFACTURING PROCESS

• EQUIPMENT REQUIRED

• MERITS AND DEMERITS

RMC PLANT

INTRODUCTION• RMC-Ready Mix Concrete.• Predetermined mixture of CSAW.• Delivered to a worksite in truck mixers .• Prevent from segregation and stiffening.• Decreases labour, site supervising cost and project time.• Ordered in units of cubic yards or meters.

HISTORY• First patented in Germany in 1903.

• Commercial delivery was made in Baltimore USA in 1913.• Mid 90’s 1100 plant consume 45%.

• USA 1990 around 72%.

• In Japan 1949 and in 1992 largest producer.

DEVELOPMENT IN INDIA• It was initially used in 1950.

• In 1991 Pune .

• Two plant in Mumbai 1993

• Unitech Construction set up:1. One plant at Hiranandani Complex.2. Bharat Diamond Bourse Commercial Complex.

SCOPE• Major concerting projects like dams, roads, bridges,

tunnels, canals etc. • for concreting in congested areas where storage of

materials is not possible. • Sites where intensity of traffic makes problems. • When supervisor and labour staff is less. • To reduce the time required for construction etc. • Huge industrial and residential projects.

RAW MATERIAL USED 1. Aggregate2. Cement3. Water4. Additives5. Air

AGGREGATE• Two types of aggregates are used.

1. Coarse aggregates

2. Fine aggregates

• Roughly 60% to 75% of concrete volume.

AGGREGATE

Fine aggregates

Coarse aggregates

CEMENT

It is a binding materials.

It’s the ingredient that gives concrete its strength. Most widely used cements are- 1. Gray Portland type 1. 2. Pozzolona Portland type 2.

WATER• Water cement ratio is important in concrete.

• Generally taken 45% wt of cement.

ADDITIVES• It is solid or liquid chemical substance.

• Added before or during preparation.

• Improve a hardened concrete’s durability.

• Reduce concrete water content in an effort to

shorten setting times.

MANUFACTURING PROCESS

EQUIPMENT REQUIRED1.Batching plant2.Silos3.Belt Conveyor4.Transit mixer

BATCHING PLANT • A concrete plant also known as a batch plant.

• Combines various ingredients to form concrete.• 2 types of batching plant-

1. Dry mix Concrete Plants.

2. Wet mix Concrete Plants.

DRY MIX WET MIX

SILOS• Vertical

• Storage of Cement, Fly ash, Limestone silos.

• Available in 3200mm to 3700mm diameter.

• Capacities of 50, 100, 200 and 300 tons.

BELT CONVEYOR

• Providing Heavy Duty Rollers & Pulleys which ensures hassle free and long life work performance.• Specifications and dimensions like 650 MM to 1200 MM wide.

• Capacities from 18 M3 to 300 M3

• Output from batching plant to Transit Mixer.

BELT CONVEYOR

TRANSIT MIXER

MERITS• Better quality concrete is produced.• A centralized concrete batching plant can serve a wide

area. • Elimination of storage space for basic materials at site. • Elimination of procurement / hiring of plant and machinery .• Wastage of basic materials is avoided. • Time required is greatly reduced. • Labor associated with production of concrete is eliminated.

DEMERITS• Concrete's limited time span between mixing and curing • The materials are batched at a central plant, and the

mixing begins at that plant, so the traveling time from the plant to site is critical over longer distances.• Access roads, and site access have to be able to carry

the weight of the truck and load concrete is approx 2.5 tonne per comm.• concrete’s limited time span between mixing and going-

off means that ready-mix should be placed within 2hours of batching at the plant

THANK YOU

READY MIX CONCRETE (RMC)

Engineering