Proper precautions for the storage of cement such as duration and place of storage, arrangement, atmospheric moisture content etc. is necessary after the process of manufacturing and before using it in the construction site.
Because the cement hygroscopic nature, the cement absorbs moisture from the atmosphere very actively and hardens like stone which cannot be used for constructional purpose. So, storage of cement should be done with care.
Precautions for Proper Storage of CementCement should not be stored normally. There are some precautions to be considered in the storage of cement. Following are the different situations against which precautions are to be taken:
- Atmospheric moisture content
- Duration of cement storage
- Place of storage
- Arranging cement bags
- Withdrawal of cement bags
1. Moisture Content at Place of StorageMoisture content or dampness is the main hazard for the cement. The moisture present in the atmosphere is enough for the cement to become useless material. The cement should be stored in such a way that it cannot expose to the atmosphere. So, air tight bags are used to pack the cement. The absorption of moisture from atmosphere will also depends up on the quality of cement. If the cement is finely grained and very good in quality, then it will absorb moisture vigorously. Hence, extra care should be taken for this type of cement and it is better use it in its fresh stage. In any case if it is exposed to atmosphere, the present of moisture content is to be tested. If the moisture content is more than 5% then it is not useful for the construction.
2. Duration of Cement StorageTime of storing is also a factor that affects the cement especially its strength. Longer the time reduces the strength of cement. It is preferred that the cement should not be stored for more than 3 months. However, if it is stored more than 3 months the strength of cement should be tested before using it. The following table gives us the percentage reduction of strength of cement for different time periods.
|Period of storage||Fresh stage||3 months||6 months||1 year||5 years|
|% Reduction in strength at 28 days||0%||20%||30%||40%||50%|