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Purchasing Cement Guidelines-1

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Purchasing Cement Guidelines-1

Gray Cement

In general ‘Cement’ means Gray Ordinary Portland Cement which is used for general purposes in construction. The cement is one of the most important raw materials used in building as the strength of any construction work depends on the quality cement. The gray cement should be factory-manufactured from a reputed manufacturer. It must not be from local plant manufacturer. It is properly packed from factory, not be hand packed locally. While taking supply of gray cement, manufacturing date, grade and type should be checked. The cement should not be more than six weeks old from the date of manufacturing. 

Types of gray cement

According to chemical properties gray cement can be classified as follows.

  • Ordinary Portland cement (for general use)
  • Rapid-hardening Portland cement (where high early strength is required)
  • Low heat Portland cement (in mass concrete for dam etc.)

Manufacturing of gray cement

All types of cement like Ordinary Portland Cement, Rapid-hardening Portland cement or Low heat Portland cement are manufactured by intimately mixing Calcareous, Argillaceous and Silica, Alumina or Iron Oxide bearing materials, which are burnt at clinkering temperature and are ground to produce gray cement, complying with specifications. No material except Gypsum or Water or both should be added after burning.   

Specifications of gray cement


There are following two methods to check fineness of Portland cement.

  • Method 1:  After sieving, the cement on IS test Sieve No.9 (B.S. Sieve No 170) should not      exceed 10% in case of Ordinary Portland Cement. 
  • Method 2:  Specific surface by Air Permeability Method should not be less than 2150 sq. cm/  kg in case of Ordinary Portland Cement


Alternatively autoclave expansion should not be more than 0.5% when tested according to IS 269 of 1989.

Setting time

Setting time of any type or any grade of cement when tested by Vicat apparatus method described in IS: 4031 should confirm following requirement.

  • Initial setting time    Not less than 30 minutes
  • Final setting time:    Not more than 600 minutes i.e. 10 hours

Compressive Strength

After 28 days compressive strength of cement concrete mix for various types of cement concrete mix is following.  

Compressive strength of cement concrete mix

 S. NO.

Type of Mix

 Ratio of Mix

 Compressive strength 


 M 10


 100 kg. Per cm square 


 M 15


 150 kg. Per cm square 


 M 20


 200 kg. Per cm square  

Note: Cement concrete cubes filled in above mentioned cement ratios should be tested after curing for 7 days and the strength of cement concrete should not be less than 70%.  

General guidelines for gray cement

Cement is the most important raw material used in construction of a building. You can ensure the quality of ‘Cement’ with following guidelines.

  • Cement bag bears date of manufacturing 
  • One cement bag has 50 Kg. weights
  • Cement bags are not hand stitched
  • Consignment must have identification mark on the package
  • Cement is packed in bags of synthetic jute or polypropylene bags
  • Factory manufactured instead of plant manufactured
  • Bears manufacturer's name or his trade mark , grade and type of cement
  • Not older than six weeks from the date of manufacturing
  • Not partially set due to moisture or have small lumps in bags
  • Not pressed or have lumps due to high pressure of stack, having more than 10 to 12 bags
  • The bags are not torn by side and stitched in later

Precautions while transporting cement

  • Carry bags in clean vehicle which is not dustier or on earth etc. as it reduces the strength of cement.
  • Take cement bags under covered Polythene or ‘Tarpaulin’ during monsoon season. 
  • Labor should not tear bags while loading and unloading cement bags.   

Precautions while stacking/storing gray cement

  • Store cement in moist proof area otherwise quality of cement will be affected
  • Stack cement bags in dry, leak proof and moisture proof shed/fumes
  • Place cement bags on dry brick floors, wooden crates or planks
  • Don’t place cement bags on the earth in any case
  • Don’t make stack of bags higher than 10 bags to avoid lumps under pressure 
  • Don’t stack up cement bags with outer walls to protect it from dampness
  • Pile up cement bags from different manufacturer separately
  • Make use of cement on first come first serve basis 
  • Cover cement bags with polythene during monsoon season
  • Keep cement bags close to each other to reduce air circulation  

Caution for storage/stacking

  • When construction work is assigned to a contractor, make sure he takes proper care of cement. Many times contractors do not take care for proper storage of cement at site as it costs them labor and money.  This results in reduction in strength of cement as shown in the table below. 
  • In some cases, it is observed that after laying RCC slab on some parts of building, the contractor dismantles his temporary store at site and places cement bags on ground floor of building which is under construction. It is not good as cement bags may draw moisture from floor and walls of new building and results in reduction of strength in cement because new building is wet due to construction work in progress.

Reduction in cement strength due to storage

 S. No

 Storage Period

 Reduction in Strength


 Fresh cement



 Three months old



 Six months old



 12 Months old 



 24 Months old



Caution for cement strength

  • Cement retards in hardening and reduces strength due to absorption of moisture during storage.
  • It is okay for cement to absorb up to 1.2% moisture as this level of moisture is acceptable but if absorption exceeds 5%, the cement is destroyed for all practical purposes. 
  • Different types of cements should not be mixed while using them for constructional purposes.