Answer / krishnaraj khatri

No the ratio 1:1.5:3.65 is incorrect. The optimum mix
design for M25 grade concrete is 1:1:2

Answer / sjtbehera

If you are going Is 456-2000 it is 1:1:2. in case you going
to mix design yes is 1:1.5:3.65. i calculate this design
according to local material.
You also cam calculate.


GRADE OF CONCRETE M 25
TYPE OF CONCRETE: RCC
MAXIMUM SIZE OF AGGREGATE, mm 20
CONCRETE CONFIRMS TO: IS456
SLUMP OF CONCRETE, mm 50-80
CONCRETE MIX FOR : MANUAL PLACEMENT

TYPE OF EXPOSURE MILD



Data on Ingredients

Ingredients Type Source
Average Specific Gravity Water Absorption
Percentage
Cement OPC 53 Coramandal king 3.15

Coarse Aggregate 20mm
2.65 0.81 33
10mm 0.81
22
NA

Fine Aggreagte Crushed Sand
2.630 2.10 32
River sand
2.600 1.00 14
Mineral Admixture 1 NA

2 NA

Chemical Admixture 1 Rehobuild sp1i MBT
1.20 0.70
Target Strength ( fck +1.65 x s )
31.60 N/mm2
Materials required per cum of concrete

Water content 167
Litres
Air content 2.00
%
Free water binder ratio
0.42
Total binder content
400 Kg
Cement content OPC 53 400
Kg
Mineral Admixture 1 NA
Kg
Mineral Admixture 2 NA
Kg
Total Aggregate
1821 Kg
Dry coarse aggregate 1 20mm
601 Kg
Dry coarse aggregate 2 10mm
401 Kg
Dry coarse aggregate 3 NA
Kg
Dry fine aggregate 1 Crushed Sand
583 Kg
Dry fine aggregate 2 River sand
255 Kg
Admixture Rehobuild sp1i
2.8 Litres
Water for absorption
23 Litres
Total water 190
Litres
Total Density of Fresh concrete
2411 Kg/cum
MIX PROPORTION BY WEIGHT

CEMENT FINE AGGREGATE COARSE
AGGREGATE
1.0 2.09 2.50

TOTAL W / B RATIO 0.47

AGGREGATE CEMENT RATIO 4.60

Answer / mahendra mohan srivastava

My last answer has a typing error here M25 will 1:1:2.

Answer / er shalu verma

OPTIMUM MIX DESIGN FOR M25- 1:1:2
SO 1:1.5:3.65 IS INCORRECT RATIO OF M25 MIX DESIGN.

Answer / janak khatri

m20 grade--1;1.5;3 correct answer

Answer / mahendra mohan srivastava

We have two type of mix one is nominal mix and second is
designe mis. if we go through nominal mix then we can say
M25 is 1:1.5:3. but M25 and above this please go through
only designe mix recommended by BIS. so we can calculate
after seive analyse and thro grading of aggregate.

Answer / lalit lokhande

When you go through the mix design ..it almost comes like
1:2.06:3.53,

1:1.5:3.65 is almost correct except the quantity of sand.

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