43 grade cement is used in general Civil Engineering construction work i.e. brick masonry, plastering, pointing, flooring and in RCC Work etc.
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.
Design Strength for 28 days= 430 kg/ sq cm
Design Strength for 28 days= 530 kg/ sq cm
43 grade cement early strength is less but with time it will attain same strength as 53 grades.
53 grade cement attain early strength. Does not increase much after 28 days.
In 43 grade cement the initial setting of cement is slow than 53 grade cement. In other words, the hydration process is not so fast i.e. release of heat is less as in case of 53 grade and micro cracking is less which is control by proper curing of concrete.