| Mon Jan 16, 2017 | Total posts : 1 |
|  Topic: Hello sir.... which cement is good one for foundation? plz suggest me
Hello sir.... which cement is good one for foundation? plz suggest me |
| |
| Tue Jan 17, 2017 | Post #1 | S L Gupta (Civil Engg)
Join date: Mar 2008 | Dear Sir,
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 Cement43
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 curing of concrete | | |
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