This document discusses ready mix concrete. It defines ready mix concrete as concrete whose components are proportioned off-site and delivered by truck in a ready-to-use condition. It provides a brief history of ready mix concrete, noting it was first used in the US in 1913 and established in Bangladesh in the 1990s. It also lists some of the major ready mix concrete companies operating in Bangladesh and discusses the manufacturing process and transportation considerations for ready mix concrete.

1. Ready Mix Concrete
MADE BY-
MD. RAFI SAJJAD
STUDENT AT
CIVIL & ENVIRONMENTAL
ENGINEERING DEPT .
ISLAMIC UNIVERSITY OF
TECHNOLOGY (IUT).

2. READY MIX CONCRETE PLANT

3. Ready Mix Concrete - Definition
“Ready mix concrete is concrete whose
components are proportioned away from the
construction site for delivery to the construction
site by the truck in a ready-to-use-condition.”

4. History
 The first concrete mixed off site
and delivered to a construction
site was effectively done in
Baltimore, United States in
1913 just before the Fist World
War.
 The first concept of transit
mixer was also born in 1926 in
the United States.
 In 1939, the first RMC plant was
installed in United Kingdom and
in 1933 first specification on
RMC was published in United
Kingdom.
Transit Mixer in late 1940’s

5. • In Bangladesh RMC was first used in 1993 by CONCORD.
• RMC was successfully established sometime after 1998 in Bangladesh,
especially at Dhaka and Chittagong.
• As per the available record up to 2010, there are around 76 RMC plant
major cities with a total capacity of around 1200 CuM/hr, producing 1.8
million cubic meter of concrete per year.
History

6. READYMIX CONCRETE FACTORY
IN BANGLADESH
The Ready-Mix concrete producing companies in Bangladesh are as follows:
•Navana RMC
•Amin Mohammad Foundation
•Bestec Ltd.
•BDCL. Concord Ready-Mix & Concrete Products Ltd.
•MIR concrete products Ltd.
•Advanced Development & Technology Ltd.
•Bashundhara Technology Ltd
•ABC Ltd.
•GBB (Gulbox Bhuiyan Ltd).
•Abdul Monem Ltd.
•Crown Readymix
•Sah Readymix
•Sana Kalyan songstha Readymix
•NDE Readymix

7. Need for Ready Mix concrete
 Requirement for higher grades of concrete
 Correct accountability ingredients
 Rapid development of infrastructure industry
 Increased demand of concrete
 Possibility of manufacture of desired grades
 Mega project demands higher output
 Timely supply of reliable concrete
By using RMC it is possible to increase
work speed manifold as an RMC plant can
produce around 30,000 cft of concrete a
day, while a traditional mixture machine
can hardly produce 1,000 cft of paste.

8. RMC Manufacturing
• Aggregates
• Additives
• Water
• Cement
• Air
Raw material used to produce concrete

9. Aggregates
Aggregates, which make up roughly 60% to 75% of ready-mix concrete’s
volume, are obtained from quarries and aggregate banks.
Additives
Additives are solid or liquid chemical substances that can be added to
ready-mix concrete before or during preparation. Most commonly used
additives either improve a hardened concrete’s durability or reduce a
concrete’s water content in an effort to shorten setting times.
Water
This is the mix’s vital fluid, which sets of a chemical reaction when it comes
into contact with the cement.
RMC Manufacturing

10. Cement
No other material rivals cement’s importance in the mix; it’s the ingredient
that gives concrete its resistance. Although types II and IV are also
employed, the most widely used cements are gray Portland type I and
Pozzolana Portland type C-2.
Concrete mixing
During the mixing phase the different components come together to
produce a uniform mass of concrete. Mixing time is registered from the
moment material and water are poured into the cement mixer, and it begins
rotating.
RMC Manufacturing
While transporting concrete to a site, the cement mixer never stops
revolving at a speed of two to six rotations per minute.

11. After producing ready mix concrete, utmost care must be given to the
quality of concrete during transportation to the site.
The following factors for transportation should be kept in mind:
Travel distance: Since the concrete setting time is very much related to
the time, so time distance between loading and pouring is very much
important. For Dhaka city, it is very much important because of too much
traffic jam and broken and dame road. Large travel time may hamper the
quality of concrete.
Transit mixers: These are the vehicles which carry ready mix concrete
from bathing plant to site. So every transit mixers should be in good
condition and tested before carrying.
RMC Manufacturing
Weather condition: As a tropical country weather is a considerable factor
for transportation of ready mix concrete. Mainly in summer season ready mix
concrete should be transported with caution.

12. Ready Mix Concrete
vs.
Site Mix Concrete
Consistent Quality- concrete is made in high
tech batching plants in a computerized
environment.
Quality is inconsistent–because concrete is
hand mixed.

13. Construction in double quick time.
Manual mixing is time consuming. Projects
take longer time to finish.
Ready Mix Concrete
vs.
Site Mix Concrete

14. Ready Mix Concrete
vs.
Site Mix Concrete
You don’t have to stock materials and
watch over them. There’s no worry
about pilferage as the concrete is
directly supplied to your site when you
need it.
Risk of pilferage of raw materials is high.
Housekeeping could be poor due to piles
of stocks lying at the site

15. Ready Mix Concrete
vs.
Site Mix Concrete
Raw materials are chosen after
strict quality checks
Quality of raw materials is manually
checked. Or not checked at all.

16. Ready Mix Concrete
vs.
Site Mix Concrete
Large quantities of concrete can be
ordered. This allows you to upgrade
yourself and handle projects of any
size.
Takes more time. Repeated mixing
needs to be done for large quantities as
the mixer will be too small to handle the
requirement.

17. Ready Mix Concrete
vs.
Site Mix Concrete
No wastage of raw materials at your
site. Everything is pre-mixed at our
plants, based on your needs.
High wastage of raw materials due to
manual mixing.

18. Ready Mix Concrete
vs.
Site Mix Concrete
No hassle of managing labour on site.
We supply ready-to-use concrete. Our
well-equipped technical crew will
handle the pouring and patching of
concrete at the site.
Involves the use of labourers for mixing
the concrete on site. Management of
labour means more time, efforts and
money.

19. Ready Mix Concrete
vs.
Site Mix Concrete
Safe work practices – no disruption in
your schedule.
Highly unsafe. Unskilled and untrained
labourers may work carelessly resulting
in dangerous working condition

20. Disadvantages Of Ready Mix Concrete
 The materials are batched at a central plant, and
the mixing begins at that plant
 Generation of additional road traffic; furthermore,
access roads, and site access have to be able to
carry the weight of the truck and load.
 Concrete's limited time span between mixing and
going-off

21. In general, the use of Ready mix concrete is beneficial to users from all
angles:
Better quality
Higher speed
Better durability
and
savings in labor .
CONCLUSION
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