CONCRETE

    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.

add 10% of extra materials of mixing wastage


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.