Cement should always be stored in a dry place, protected from rain by an undamaged, impermeable plastic sheet and raised off the floor if possible.
Things to remember:
1. Keep cement protected from dampness and moisture
Cement is extremely sensitive to moisture, and when exposed to it, it hardens and forms clumps. It is critical to preserve cement bags from wetness (rain, flooding, leaks, etc.) and dampness when storing them on the job site (moisture present in the air). The cement bags should be stored in a dry, enclosed building that is free of rain and moisture, and the piled cement bags should be covered with waterproof sheets or tarps.
2. Do not place cement bags directly on concrete or wood floors
To keep moisture from rising from the ground, put the bags on a high platform with an impermeable plastic sheet below.
3. Handle cement bags carefully
While handling the cement bags:
• Make certain that the cement bags are not dropped. This has the potential to weaken and ruin the packaging.
• Before lifting the cement bags, roll them over. This helps to loosen the cement and lowers the likelihood of the bag splitting.
• When handling individual cement bags, do not grasp them at the ends. Make sure the bag is held in place by providing support on the underside. This will assist to keep the bag from sagging and splitting in the middle, as well as decrease pressure on the shoulders and back.
• Make certain that the cement bags are not kept upright or on their sides, but are instead put flat with their broad sides down.
4. Keep cement bags protected during transportation
• To avoid punctures or damage to the bags, remove any sharp objects from the vehicle before loading the bags.
• When loading the cement bags, ensure that they are piled in alternating orientations, covered with a tarpaulin or water proof sheet, and firmly fastened down to prevent movement during transit.
5. Store cement bags separately
Do not store the cement bags with fertilizers or other products, as any contamination can affect the quality and performance of the screed.
6. Provide adequate ventilation when stored in pallets in warehouses
When storing cement bags in warehouses, ensure there is enough ventilation to prevent moist air accumulation.
7. Rotate cement bags on a first in basis
The strength of cement deteriorates with time so rotate the stock to ensure usability. Check the manufacturers’ date and use the oldest stock first.
The below chart is the duration and devaluation of stored cement’ strengths.
|Times of storage||Natural phase||3 months||6 months||1 year||5 years|
|Devaluation in strength at 28 days||0%||20%||30%||40%||50%|
8. Store leftover cement carefully
Cement in damaged or opened bags should be utilised immediately, but preferably they should be re-bagged in plastic bags or heavy-duty trash bags, with the mouths tightly shut with thread or tape.