seminar or presentation on ready mix concrete
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mohammed thouseef
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25-02-2011, 03:36 PM

seminar and presentation on ready mix concrete
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15-02-2012, 01:49 PM

to get information about the topic ready mix concrete full report ,ppt and related topic refer the link bellow
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30-03-2012, 09:42 PM

i need deetail information about ready mix concrete pls send on my email id
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to get information about the topic "ready mix concrete" full report refer the link bellow
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20-10-2012, 05:14 PM


.doc   READY MIXED.doc (Size: 475 KB / Downloads: 23)



A concrete whose constituents are weigh batched
at a central batching plant, mixed either at the
plant itself or in truck mixers, and then
transported to the construction site and delivered
in a condition ready to use, is termed as READY
Enables the places of manufacture and use of
concrete being separated and linked by suitable
transport operation.
A concrete whose constituents are weight batched at a central
batching plant, mixed either at the plant itself or in truck mixers, and then
transported to the construction site and delivered in a condition ready to use, is
This enables the places of manufacture and use of concrete being
separated and linked by suitable transport operation.
This technique is useful in congested sites or at diverse work places
and saves the consumer from the botheration of procurement, storage and handling
of concrete materials.
Ready mix concrete is produced under factory conditions and permits
a close control of all operations of manufacture and transportation of fresh concrete
Due to its durability, low cost and its ability to be customized for
different applications, ready mix concrete is one of the most versatile and popular
building materials.


Quality of ready mix concrete is generally specified in terms of two
1. Performance parameters
2. Prescriptive specifications
1. Performance parameters:
Purchaser specifies the strength level and intended use of concrete.
It is the best way to order ready mixed concrete because RMC producer, who is
expert in the field, would design an economical mix with the desired properties
The RMC producer accepts the responsibility for the design of the
mixture for the desired performance
2. Prescriptive specifications:
Purchaser specifies aggregate size, slump, air content, cement content,
or weight of cement per cubic meter of concrete, maximum water content and
admixtures required.
In this case, the purchaser accepts the responsibility for concrete
strength and its performance.


The proportioning of an RMC aims at obtaining an economical and
practical combination of materials to produce concrete with the properties desired
for its intended use, such as workability, strength, durability and appearance.
The following basics of a good concrete mix should be considered
While proportioning RMC for the desired performance.
1. Concrete aggregates should be clean, strong and durable.
2. Fly ash or other supplementary cementitious materials, which
enhance concrete properties, are normally added to RMC.
3. Admixtures are commonly used in relatively small quantities to
improve the properties of fresh and hardened concrete such as the
rate of setting and strength of development of concrete, especially
during hot and cold weathers.


There are three principal categories of RMC.
1. Transit mixed concrete
2. Shrink mixed concrete
3. Central mixed concrete


It is also called truck mixed or dry batched concrete, all the
ingredients are charged directly in the truck mixer. Most of the water usually
batched at the plant.
There are three options for truck mixed concrete.
•Concrete mixed at the job site:
While traveling to the job site the drum is turned at
agitating speed(slow speed). After arriving at the job site,
the concrete is completely mixed. The drum is then
turned for 70 to 100 revolutions, or about 5 minutes, at
mixing speed.
•Concrete mixed in the yard or central batching plant:
The drum is turned at high speed or 12-15 rpm for 50
revolutions. This allows quick check of batch. The
concrete is then agitated slowly while driving to the job
•Concrete mixed in transit:
The drum is turned at medium speed or about 8 rpm for
70 revolutions while driving to the job site. The drum is
slowed to agitating speed.


All the ingredients used for preparation of the concrete, are thoroughly tested for their quality and physical properties in a well equipped laboratory attached to the plant for conformity to relevant Indian Standard Codes.
The moisture probe determines the water content in the sand and aggregates. This accordingly helps in fixing the proportion of water to be added for the preparation of the mix.
The sand being used is passed through the mechanized sieving system, before feeding for mixing.
Trial mixes are carried out and tested to ensure that each and every batch of concrete coming out of the plant meets the parameters of client’s requirements
The sand being used is passed through the mechanized sieving system, before feeding for mixing.
seminar flower
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25-10-2012, 01:50 PM


.doc   READY MIX.doc (Size: 519.5 KB / Downloads: 19)


Few things are more aggravating to produce on a worksite than concrete. Bags of cement, sand, aggregate (gravel) and possibly other additives must be delivered to the construction area. A supply of clean water is also necessary, along with a rented concrete mixing hopper. Even after all the dusty and heavy ingredients have been loaded into the hopper, one small error in the wet/dry ratio can render an entire batch of concrete unusable. One common solution to this messy and time-consuming problem is
In the case of the centrally mixed type, the drum carrying the concrete revolves slowly so as to prevent the mixed concrete from "segregation" and prevent its stiffening due to initial set.
“READY MIX CONCRETE”Ready-mix concrete (RMC) is a ready-to-use material, with predetermined mixture of cement, sand, aggregates and water. RMC is a type of concrete manufactured in a factory according to a set recipe or as per specifications of the customer, at a centrally located batching plant.
It is delivered to a worksite, often in truck mixers capable of mixing the ingredients of the concrete en route or just before delivery of the batch. This results in a precise mixture, allowing specialty concrete mixtures to be developed and implemented on construction sites. The second option available is to mix the concrete at the batching plant and deliver the mixed concrete to the site in an agitator truck, which keeps the mixed concrete in correct form.


1. Better quality concrete is produced.
2. Elimination of storage space for basic materials at site.
3. Elimination of Procurement / Hiring of plant and machinery
4. Wastage of basic materials is avoided.
5. Labour associated with production of concrete is eliminated
6. Time required is greatly reduced
7. Noise and dust pollution at site is reduced.
8. Organization at site is more streamlined.
9. Durable & Affordable
10. No storage space required either for raw materials or for the mix
11. Lower labour and supervisory cost
12. No wastage at site
13. Environment friendly
14. Availability of concrete of any grade


1. Need huge initial investment.
2. Not affordable for small project and implimentations (small quantity of concrete)
3. Needs effective transportation system from R.M.C to site.
4. Traffic jam or failure of vehicle creates problem if proper dose of retarder is not given.
5. Labours should be ready on site to cast the concrete in position to vibrate it and compact it.


"Concrete is a construction material composed of cement (commonly Portland cement) as well as other cementitious materials such as fly ash and slag cement, aggregate (generally a coarse aggregate such as gravel, limestone, or granite, plus a fine aggregate such as sand), water, and chemical admixtures. The word concrete comes from the Latin word "concretus" (meaning compact or condensed), the past participle of "concresco", from "com-" (together) and "cresco" (to grow).
Concrete solidifies and hardens after mixing with water and placement due to a chemical process known as hydration. The water reacts with the cement, which bonds the other components together, eventually creating a stone-like material. Concrete is used to make pavements, architectural structures, foundations, motorways/roads, bridges/overpasses, parking structures, brick/block walls and footings for gates, fences and poles.
Concrete is used more than any other man-made material in the world.
1. As of 2006, about 7.5 cubic kilometres of concrete are made each year—more than one cubic metre for every person on Earth.
2. Concrete powers a US $35-billion industry which employs more than two million workers in the United States alone.More than 55,000 miles (89,000 km) of highways in the United States are paved with this material. The People's Republic of China currently consumes 40% of the world's cement/concrete production.

Transit Mixed (or "truck-mixed") Concrete

While ready mixed concrete can be delivered to the point of placement in a variety of ways, the overwhelming majority of it is brought to the construction site in truck-mounted, rotating drum mixers. Truck mixers have a revolving drum with the axis inclined to the horizontal. Inside the shell of the mixer drum are a pair of blades or fins that wrap in a helical (spiral) configuration from the head to the opening of the drum. This configuration enables the concrete to mix when the drum spins in one direction and causes it to discharge when the direction is reversed.
To load, or charge, raw materials from a transit mix plant or centrally mixed concrete into the truck, the drum must be turned very fast in the charging direction. After the concrete is loaded and mixed, it is normally hauled to the job site with the drum turning at a speed of less than 2 rpm.

Shrink Mixed Concrete

Concrete that is partially mixed in a plant mixer and then discharged into the drum of the truck mixer for completion of the mixing is called shrink mixed concrete. Central mixing plants that include a stationary, plant-mounted mixer are often actually used to shrink mix, or partially mix the concrete. The amount of mixing that is needed in the truck mixer varies in these applications and
should be determined via mixer uniformity tests. Generally, about thirty turns in the truck drum, or about two minutes at mixing speed, is sufficient to completely mix shrink-mixed concrete.
.Central Mixed Concrete
Central-mixing concrete batch plants include a stationary, plant-mounted mixer that mixes the concrete before it is discharged into a truck mixer. Central-mix plants are sometimes referred to as wet batch or pre-mix plants. The truck mixer is used primarily as an agitating haul unit at a central mix operation. Dump trucks or other non-agitating units are sometimes be used for low slump and mass concrete pours supplied by central mix plants.


Ready Mix Concrete plant is a modern technique of production of concrete in large quantities away from the actual site of placing. It is very useful in cities where demand of concrete is very high and construction sites are in congested areas where mixing on site is not possible. It is suitable for project and implimentations like Dam, Roads, Bridges, commercial complex, Malls and all types of mass construction where time limit plays a vital role and where demand is huge.

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