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OPC Cement, 53 Grade Cement & Portland Slag Cement Manufacturer & Exporter in India

Standard Practices In Cement Storage

Importance of Proper Storage of Cement

The binding property and strength of cement depend upon its capacity for chemical reaction, which can take place in the presence of water. Cement if not stored properly can absorb moisture from the atmospheric air or any other source and react with it chemically. The strength of such type of cement when used would be adversely affected to the extent such reaction would have taken place.

For prevention of cement against deterioration and retaining its freshness its storage should be such that no dampness or moisture is allowed to reach cement either from the ground, walls or from the environment. This becomes particularly important during the humid season and in coastal regions when atmospheric air contains higher amount of moisture in it.

Cement Godown at Site

In most construction projects godowns are constructed at site for storage of a few days requirement of cement. Even though such godowns are temporary in nature, they must conform to the following requirement.

  • The walls must be plastered and made damp proof
  • The roof must be given an appropriate water proofing treatment
  • The floor must be raised by at least 80 cm above the ground level to prevent any inflow of water. The flooring may consist of a 15 cm thick layer of dry bricks laid in two courses over a layer of earth consolidated to a thickness of 15cm above the ground level.
  • For further protection, cement bags should be stacked at least 10-20 cm clear above the floor by providing wooden battens and planking arrangement. For saving timber concrete may be used.
  • If any windows are provided, these should be few and small and normally kept tightly closed to prevent entry of atmospheric moisture from outside.
  • A newly constructed godown should not be used for storage of cement unless its interior is thoroughly dry.
Proper Method For Stacking Cement Bags

The arrangement should be such that it is convenient both for stacking and removal of cement bags and it also leaves adequate space for movement and inspection of bags for counting purposes etc.,

No cement bags should be stacked in contact with an external wall. A clear space of at least 60 cm should be left between the exterior wall and the stacks

Cement bags should be placed closely together in the stack to reduce circulation of air as much as possible. Cement bags should not be stacked more than ten bags high to avoid lumping or ‘warehouse pack’ under pressure. If the stack is more than seven bags high, arrange the bags in header and stretcher fashion (i.e.) alternately length-wise and cross-wise, to achieve interlocking between them and lessening the danger of toppling over, the arrangement of two stacks with a height of seven bags and ten bags respectively.

For extra safety during rainy season, the stacks of cement bags should be enclosed completely in polythene sheets (atleast 700 gauge thick) or similar material if it is anticipated that cement would not be required for a prolonged period. This can be achieved by making a large loose sack of the polythene sheet and arranging cement bags within it with flaps of the sheet closing on the top of the pile. Care should be taken to ensure that the polythene sheet is not damaged any time while in use.

Temporary Storage at Site

Sometimes cement requirement of a day or two may have to be stored at site in the open. In such cases cement bags should be laid on a dry platform made of wooden planks resting over brick-masonry concrete, dry sand agregates raised about 15 cms above the ground level.

The stack must be kept fully covered with tarpaulin or polythene sheet and protected against atmospheric moisture. The covering sheets must overlap each other properly. Temporary storage on open storage should not be adopted in wet weather.

Information Available on a Standard Cement Bag

The following information normally printed on a standard cement bag may be noted at the time of receiving cement bags.

  • Type of cement
  • IS certification Mark
  • Approximate net weight of cement
  • Week, month and year of manufacture
  • Manufacturer’s name and registered Trade Mark, if any
  • Proper Method For Removal of Cement Bags
Proper Method For Ramoval of Cement Bags
Stepping of Tiers while Removing Cement Bags

Stepping of Tiers while Removing Cement Bags

When removing bags for use, apply the “First in, First out” (FIFO) principle i.e. take out the oldest cement first. Each consignment of cement should be stacked separately in the godown so as to permit easy access for inspection and to facilitate removal in a proper sequence. It would be desirable to pin a play card on each pile of cement indicating the date of its arrival in the Godown.

Storage Capacity of a Cement Godown

While working out the inside dimensions of a cement godown for storage of specified quantity of cement filled bags, the following dimensions may be considered.

Length of Cement bags: 70 cm (average)

Width: :35 cm (average)

Thickness :14 cm (average)

Clearance and passages :60 cm (average)

Effect of Storage on Strenght of Cement

The cement when stored for longer period of time loses its strength characteristics. The strength of cement when used after one year of its production loses its strength by about 40-50% on application as compared to that of freshly produced cement. The loss of strength characteristic of cement at different interval of times is as given below in the table.

Age of Cement % Reduction in its Strength
3Months 20-30
6Months 30-40
12 Months 40-50
Tips For Storage of Cement
  • Do not store in a building where walls, roof and floor are not completely weather proof.
  • Do not store in a new warehouse until the interior is thoroughly dried out.
  • Do not make contact with a badly fitted windows and doors and see that they are kept closed.
  • Do not stack against the wall. Always pile on the floor on wooden planks.
  • Do not forget to pile bags together.
  • Do not pile more than 15 bags high and arrange the bags in header and stretcher fashion.
  • Do not take cement from one tier. Step back to three or four tiers.
  • Do not keep dead storage.
  • Do not keep bags on the grounds for temporary storage at work site. Pile on raised dry platform and cover with tarpauline or Polythene sheets.

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