Concrete Mix Design for M20 grade

Dnyan Deshmukh

Honorary Member
Staff member
Sep 7, 2017
1,942
3,092
Pune
#1
Concrete Mix Design for M20 grade of concrete
M20 is commonly used most popular grade of concrete for RCC works.

Concrete mix Design for M20 Grade concrete with fly ash is as follows;

OPC Cement 53 Grade – 259 Kg

Fly ash – 61 Kg

Water Cement ratio (w/c) – 0.5

Free Water – 160 liters

20mm Metal / Aggregates – 519 Kg

10mm Metal / Aggregates – 495 Kg

Crush Sand – 1027 Kg

Admixture Dosage – 0.6%

Admixture – 1.92 Kg

Density of Concrete – 2523 Kg/cum

The complete mix design file is attached herewith.

You can modify the mix design by changing the specific gravities of materials which will make it relevant as per the material available at your place.
Changing the specific gravity will change the weight of material in mix design which is automatically calculated.
Do not use this mixes directly without doing prior trials of it, the data provided is for educational and better understanding of mixes.
After doing trial, if any issue observed, you can do adjustment by adjusting the % of each size of aggregate to achieve the required properties of fresh concrete.
Do ensure total of all aggregate percentage in mix should some to 100%

In general, for direct placement concrete
Ration of fine aggregates to coarse aggregates kept between 35:75 to 40:60
In case of pump concrete the fine content is kept above 45%
You can adjust the percentages of fines and coarse by looking at the concrete produced during trial.

Admixtures plays an important role in properties of fresh concrete specially in workability and retention.
Do select admixture correctly to ensure no failure during actual use of concrete.

All can reply to this thread with there mix design of same grade, this will help other to understand designing in more better way and can do a cost optimization.
 

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Dnyan Deshmukh

Honorary Member
Staff member
Sep 7, 2017
1,942
3,092
Pune
#2
Concrete mix Design for M20 Grade concrete with PPC Cement is as follows;

PPC Cement 53 Grade – 320 Kg

Water Cement ratio (w/c) – 0.5

Free Water – 160 liters

20mm Metal / Aggregates – 531 Kg

10mm Metal / Aggregates – 489 Kg

Crush Sand – 1049 Kg

Admixture Dosage – 0.6%

Admixture – 1.92 Kg

Density of Concrete – 2550 Kg/cum

The complete mix design file is attached herewith.
 

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Dnyan Deshmukh

Honorary Member
Staff member
Sep 7, 2017
1,942
3,092
Pune
#3
Concrete Mix Design for M20 Grade with GGBS is as follows;

OPC Cement 53 Grade – 230 Kg

GGBS – 90 Kg

Water Cement ratio (w/c) – 0.47

Free Water – 150 liters

20mm Metal / Aggregates – 787 Kg

10mm Metal / Aggregates – 350 Kg

Crush Sand – 969 Kg

Admixture Dosage – 0.6%

Admixture – 1.92 Kg

Density of Concrete – 2577 Kg/cum

The complete mix design file is attached herewith.
 

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Pankaj Sharma

Royal Member
Staff member
Sep 7, 2017
331
370
India
#7
Concrete Mix Design for M20 Grade with GGBS is as follows;

OPC Cement 53 Grade – 230 Kg

GGBS – 90 Kg

Water Cement ratio (w/c) – 0.47

Free Water – 150 liters

20mm Metal / Aggregates – 787 Kg

10mm Metal / Aggregates – 350 Kg

Crush Sand – 969 Kg

Admixture Dosage – 0.6%

Admixture – 1.92 Kg

Density of Concrete – 2577 Kg/cum

The complete mix design file is attached herewith.
Thanks Sir for sharing these valuable knowledge.