This article explains what are the different ways in which A class material can get lost & damaged and also gives tips so that these can be preserved properly.
Cement gets wasted during unloading , storage , handling, mixing of concrete , mixing of mortar etc.
Often old cement bags get set in the godown. New bags are received and deposited above old stock. Naturally new bags are first used leaving old bags to be left again.
Invariably these bags become solid and have to be later dumped in the back filling along with boulders.
(tip: Use FIFO : First in first out )
3.Cement issued from stores:
Cement issued for masonry or plastering gets dumped at the location of work but the remaining bags are not returned to godown in the evening. Next day these bags get a fresh shower during the curing process and get set.
( Tip: Issue cement bags to the sub contractor and debit the cost to him in case of such waste)
4.Cement pilfered to Labor hutments:
A random quantity of cement also gets pilfered to hutments for unauthorized pavings , platforms.
(Note: This is often unavoidable because of sensitivity . This can be tackled by involving the labor gang )
( Tip: Make a bricks on edge platform without using mortar and unload material on this. Make bunds with bricks around the storage)
6.Cement mortar :
Sand is placed directly on floor ,cement bag is added and a water pipe is kept over it till it floods the mix. Cement slurry overflows on the slab and is wasted.
( Tip: Use mild steel trays for mixing mortars . You shall have to insist on the use.)
First batch mixed is dumped near mixer for making the seat for the hopper and is obviously wasted.
( Tip: Use of old mild steel plates for the platform where trolleys can be parked while receiving concrete from the drum)
8.Surplus concrete when mixed at site :
Often during mass concrete , a certain quantity from the last batch gets surplus and is dumped on the site .
( Tip: Prepare part batch during end of concrete)
Fitters dump the cut pieces bar on site . These get covered by soil and are lost.
( Tip: Issue steel to the RCC sub contractor and debit the cost to him in case of such waste)
11.Binding wire :
The surplus cut pieces of binding wire are dumped on the centering which just get buried in the concrete.
Wooden sections: Get warped in presence of water . Normally stored in the covered area where plinth has been completed.
Electrical conduits & fittings: To be stored in the godown and issued to the electrical sub contractor on day to day basis only.