The mix proportion for M40 concrete is 1:1.65:2.92W/C ratio = 0.4The design calculation is as per IS mix design
In this M refer to Maximum compressive strength and 20 refer that concrete that with stand upto 20KN compressive strength.
upto M25 it is nominal mix but after that are the design mix which need to becalculated.....
The ratio of cement, sand and crushed stone in M 25 grade concrete is 1:1:2.In this grade of concrete a compressive strength not less than 25 N/mm2 is achieved in 28 days.
Volume componentsGrade 20 concrete 1:2:4 (cement:sand:aggregate)Grade 25 concrete 1:1.5:3 (cement:sand:aggregate)Grade 30 concrete 1:1:2 (cement:sand:aggregate)See related link below for more info
The mix proportion for M40 concrete is 1:1.65:2.92W/C ratio = 0.4The design calculation is as per IS mix design
Design Aspect
In this M refer to Maximum compressive strength and 20 refer that concrete that with stand upto 20KN compressive strength.
upto M25 it is nominal mix but after that are the design mix which need to becalculated.....
Ans: M15 grade indicates the grade of concrete used in the structure i.e M indicates the design mix proporation and 15 indicates the compressive strength of conctrete at 28 days in N/mm2
M. D. Enoch has written: 'Building a concrete block garage' -- subject(s): Concrete blocks, Concrete construction, Design and construction, Garages 'Concrete for sports and play areas' -- subject(s): Concrete construction, Synthetic sporting surfaces
Density of concrete shall be achieved by 1. Providing airtight / watertight form work (Shuttrering to ensure no cement slurry is pilferred), 2. Using appropriate vibrators to vibrate the poured concrete to ensure proper compaction 3. Adding properely desinged admixtures and 4. Adequate design mix of concrete (M10 to M35) - m Velsamy -
Volume componentsGrade 20 concrete 1:2:4 (cement:sand:aggregate)Grade 25 concrete 1:1.5:3 (cement:sand:aggregate)Grade 30 concrete 1:1:2 (cement:sand:aggregate)See related link below for more info
The ratio of cement, sand and crushed stone in M 25 grade concrete is 1:1:2.In this grade of concrete a compressive strength not less than 25 N/mm2 is achieved in 28 days.
For design consideration Reinforced concrete is 150 lbs/ft^3. Unreinforced is around 145 lbs/ft^3. That comes out to 2402.77 kg/m^3 and 2322.68 kg/m^3 respectfully
It is the bearing capacity in N/mm2 when tested on 21 day on a hydraulic testing m/c When we tested this grade concrete cubes on 28th day the compressive strength value have to come 35 N/mm2.
It is the grade of concrete which indicates the strength of concrete after 28 days curing. M #) means the strength of concrete after 28 days of curing will be 30 N/mm2 .