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OPC and PPC cement

Fri Jun 24, 2016Total posts : 1
Meda Kameswara Rao
Meda Kameswara Rao
Join date: Jun 2016
Topic: OPC and PPC cement

Dear Sirs,
I am constructing new house. What will be result if I use PPC cement for brick wall construction and OPC for plastering? Thanks

Sat Jun 25, 2016Post  #1
S L Gupta (Civil Engg)
S L Gupta (Civil Engg)

Join date: Mar 2008
Dear Rao
       Types of Cement 
For engineering purposes, there are many types of cement but in general, ‘Ordinary Portland Cement’ (OPC) which is available in three grades should be used for house construction
 
33 Grade Ordinary Portland Cement
This ordinary 'Portland' cement is used maximum in the country. It is more suitable cement for masonry and general concrete works where the members are not taken to very high stresses. It is not suitable where ‘Sulphate’ is in the soil or in the ground water.
 

43 Grade Ordinary Portland Cement
43 grades of cement are used where high early strength in 1 to 28 days range is required. These days the ‘Structural Engineers’ propose these cements mainly for RCC works where a member takes high tensile stress.
 
53 Grade Ordinary Portland Cement


53 grades of cement are used where high early strength in 1 to 28 days range is required. These days ‘Structural Engineers’ propose these cements mainly for RCC works, where a member takes high tensile stress.
 
Caution in the use of 53 grade cement in construction:

The strength of 53 grade cement does not increase much after 28th day because of early gain while 33 grade cement continues to gain strength after 28th day.
 
In addition, due to faster hydration process, the concrete releases heat of hydration at much faster rate initially and release of heat is the highest in case of 53 grades. The heat of hydration being higher, the chances of micro-cracking of concrete is much greater. Thus during initial setting period of concrete, the higher heat of hydration can lead to the damage of micro-cracking within the concrete which may not be visible at surface.
 
This cracking is different from shrinkage or cracks which occur due to faster dryness of concrete in windy conditions. The situation can be worse when we tend to increase the quantity of the cement in concrete with a belief that such increments are better for both strength and durability of concrete.
 
Thus it is very essential to be very careful in advance that higher grade cement specially GRADE 53 SHOULD be used only where such use is warranted for making the concrete of higher strength and also where good quality assurance measures are in place by which proper precautions are taken to relieve the higher heat of hydration through chilling of aggregates or by proper curi

 

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