The word concrete comes from he Latin word "concretus"
concrete is made up of cement, river sand (or) M-sand, coarse aggregate and admixtures.
CONCRETE MIX DESIGN AS PER STRANDED
M10 1:3:6
M15 1:2:4
M20 1:1.5:3
M25 1:1:2
for example M10 ratio 1% of cement 3% of sand 6% coarse aggregate
use water percentage as per IS CODE
VIDEO
this video shows how to mix the concrete.
this video shows how to mix the concrete.
add 10% of extra materials of mixing wastage
PLACING OF CONCRETE
PLACING OF CONCRETE
The placement of concrete is a very important operation.
There is the only purpose of using shuttering oil before casting of
column is that to remove the shutter smoothly & get hard uniform finish concrete.
The placement of concrete height should
be less than 1m.
COMPACTION OF CONCRETE
The process of
consolidating the plastic concrete is called Compaction of concrete.
in this process, efforts are made to reduce the
voids manually or mechanically from the plastic concrete and obtain a
homogeneous concrete.
The compaction
of concrete should be less than 50 seconds.
FINISHING
CONCRETE
Finishing is done
after compaction o obtain level and smooth surface.
There are many ways to finish concrete to provide a desired aesthetic.
Steps involved are screeding
, floating followed by Trowelling.
CURING OF CONCRETE
Curing should start as soon as
concrete is stiffened.
Curing is essential to achieve
strength and durability of concrete.
Curing should be continued for
minimum of 10 days for OPC.
