How to measure concrete mix design
Concrete mix design refers to the method utilized for finding out the exact ratios of cement, sand and aggregates for concrete so that the target strength of concrete can be obtained.
For concrete mix design, different types of laboratory testing and calculations should be accomplished to get exact mix ratios. This method is suitable for Building structures where superior grades of concrete are required like M 25 and over as well as large construction projects where quantity of concrete consumption is extreme.
The main objective of concrete mix design is to arrange the proper ratios of materials so that the application of concrete becomes cost-effective to maintain perfect strength of structural members. In a project, large quantity of concrete & construction work are required and saving in quantity of materials like cement makes the construction project cost-effective.
Concrete Mix design of M – 20, M – 25, M – 30 and superior grade of concrete are measured from following steps:
Concrete Mix Design:
Necessary data for Mix Design of Concrete:
• Concrete Mix Design Date:-
(a) Characteristic compressive strength of concrete necessary at end of 28 days = M 25
(b) Nominal maximum size of aggregate applied = 20 mm
(c) Shape of Coarse Aggregate = Angular
(d) Necessary workability at site = 50-75 mm (slump Value)
(e) Quality control is performed as per IS: 456
(f) Type of exposure condition of concrete (as specified in IS: 456) = Mild
(g) Type of cement applied = PSC as per IS: 456 – 2000
(h) Method of providing Concrete on Site = pumpable concrete
(ii) Material testing data (set in the laboratory):
(a) Specific gravity of cement = 3.15
(b) Specific gravity of FA = 2.64
(c) Specific gravity of CA = 2.84
(d) The surface of aggregates is supposed to be in dry condition.
(e) Fine aggregates are abided by Zone II of IS – 383
To get details on the method of M-25 grade concrete mix design, click on the following link. civiconcepts.com