A CASE STUDY ON CERAMIC INDUSTRY OF BANGLADESH.pptx
READY MIX CONCRETE
1.
2. 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
factory according to a set recipe or as per
specification of the customer, at centrally
located batching plant.
3. RMC is delivered to a worksite, often in truck
mixers.
Truck mixers are capable of mixing the
ingredients of the concrete en route or just
before delivery of the batch.
4. The second option available to deliver the
mixed concrete to the site is an agitator
truck.
Agitator trucks receive ready-mixed concrete
from a nearby plant and deliver it to truck-
accessible job sites.
5. The key difference between this delivery type
and mixer trucks is that agitator trucks do
not mix water with the concrete en route.
The way the concrete leaves the plant is how
it will be when it's poured into position.
6.
7. Speedy construction.
Lower labour and supervisory costs.
Multi- transportation of raw materials is
eliminated.
Controlled W/C ratio.
Use in congested sites or in highway
construction where there is little space for a
mixing plant and aggregate stocking.
Minimization of cement wastage.
8. The materials are batched at a central plant, and
the mixing begins at that plant, so the travelling
time from the plant to the site is critical over
longer distances.
Generation of additional road traffic.
Furthermore, access roads and site access have
to be able to carry the greater weight of the
ready-mix truck plus load. (Green concrete is
approx. 2.5 tonne per m³.)
Concrete's limited timespan between mixing and
going-off means that ready-mix should be
placed within 210 minutes of batching at the
plant.