Concrete Mix Design – M 20 Grade Of Concrete
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1. REQUIREMENTS
a) Specified minimum strength = 20 N/Sq mm
b) Durability requirements
i) Exposure Moderate
ii) Minimum Cement Content = 300 Kgs/cum
c) Cement
(Refer Table No. 5 of IS:456-2000)
i) Make Chetak (Birla)
ii) Type OPC
iii) Grade 43
d) Workability
i) compacting factor = 0.7
e) Degree of quality control Good
2. TEST DATA FOR MATERIALS SUPPLIED
a) CEMENT
i) Specific gravity = 3.05
ii) Avg. comp. strength 7 days = 46.5 more than 33.0 OK
28 days = 55.0 more than 43.0 OK
b) COARSE AGGREGATE
i) 20mm Graded
Type Crushed stone aggregate
Specific gravity = 2.68
Water absorption = 1.46
Free (surface) moisture = 0
c) FINE AGGREGATE (Coarse sand)
i) Type Natural (Ghaggar)
Specific gravity = 2.6
Water absorption = 0.5
Free (surface) moisture = 1.4
3. TARGET MEAN STRENGTH (TMS)
a) Statistical constant K = 1.65
b) Standard deviation S = 4.6
Thus, TMS = 27.59 N/Sqmm
4. SELECTION OF W/C RATIO
a) As required for TMS = 0.5
b) As required for ‘Moderate’ Exposure = 0.55
Assume W/c ratio of 0.5
5. DETERMINATION OF WATER & SAND CONTENT
For W/C = 0.6
C.F. = 0.8
Max. Agg. Size of 20 mm
a) Water content = 186 Kg/cum
b) Sand as percentage of total aggregate by absolute volume = 35 %
Thus,
Net water content = 180.42 Kg/cum
Net sand percentage = 33 %
6. DETERMINATION OF CEMENT CONTENT
W/c ratio = 0.5
Water content = 180.42 Kg/cum
Thus, Cement content = 360.84 Kg/cum Adequate for moderate exposure Say 360 Kg/cum
7. DETERMINATION OF COARSE AND FINE AGGREGATE CONTENT
Assume entrapped air as 2 %
Thus,
0.98 cum = [180.42+360/3.05 + {1/0.33}*{fa/2.6}]/1000
& 0.98 cum = [180.42+360/3.05 + {1/0.67}*{Ca/2.68}]/1000
Hence,
fa = 584 Kg/cum
Ca = 1223.8 Kg/cum
The final mix proportions of M-20 grade of concrete become:-
Note: 1 The above recommended mix design must be verified, by actual cube tests.
2 The mix design is based on the quality and grading of the materials actually supplied, by the client.
Any variation in quality and gradation will result in changes in the mix design.
This mix design was submitted by a regular contributor to this site. We are thankful to him for his excellent service.
July 29th, 2009 at 2:03 am
me student of civil engineering, thank u very much for your study supporting materials.
August 1st, 2009 at 12:01 pm
i think u can do it much better….for eg: w/c ratio graph could b shown
August 10th, 2009 at 1:23 pm
The Study Material is really very good and useful. Thank You…
August 13th, 2009 at 12:08 pm
What is the theorotical Mix Design Proportion for M 25 Grade Of Concrete and Details ???
August 18th, 2009 at 11:56 am
we have required for What is the theoretical Mix Design Proportion for M 25 Grade Of Concrete and Details with ratio n analysis ???
August 27th, 2009 at 8:16 am
Sir,this web site is not only usefull for students but alsofor proffessionals.
Sir pl provide design mix for rigid pavements and necessary information regarding PQC and letest repair techenology for repair of flaxible pavements.
August 31st, 2009 at 10:07 am
Sir,
We have required for What is the theoretical Mix Design Proportion for M 25 Grade Of Concrete and details with ratio n analysis (Using 33 grade OPC, ‘moderate’ exposure, slump=180-190 mm & required water reducing admixture), as per IS standard.
Thanking U.
S. K. Parida.
September 1st, 2009 at 7:04 am
sir, this is such a very useful website. its very helpful to every person who is connected with construction and also to students.
sir pl.provide mix design of F.R.C. and G.F.R.C to me.
September 2nd, 2009 at 8:58 am
please tell me how to calulate the cement quantity for m10,m15,m20,m25,m30,m35 & how to calculate aasfgvsdgfdthe curve calculation for canal lining for 2:1 slope(concrete)
September 2nd, 2009 at 9:00 am
what is the volume of cement bag
September 2nd, 2009 at 2:16 pm
i have details of M25 concrete slump test.
September 4th, 2009 at 2:12 am
the figures given for the mix design above is for 1 cu m of concrete??
September 14th, 2009 at 6:41 am
i want to know about the cement consumption in 1 cubic meter RCC (1:1.5:3) and PCC (1:2:4).
September 16th, 2009 at 6:29 am
Sir
i need mix design calculation for M25 grade concrete
September 22nd, 2009 at 6:15 am
its good to learn about more in mix design m20.
September 23rd, 2009 at 1:25 am
Nice to learn more about mix design of different grade of concrete
October 7th, 2009 at 5:36 am
Its a very informative but i wanna know the minimum cement requirement for M25 grade concrete with OPC43
October 12th, 2009 at 6:39 am
i want to know about the cement consumption in 1 cubic meter RCC (1:1.5:3) and PCC (1:2:4).
October 12th, 2009 at 7:59 am
Generally we consider the ratio of m20 grade as (1:1.5:3)as cement , fine aggregates , and coarse aggregates
so is it also right (1:1.5:3) if we manually prepare concrete at site.
i will be grateful if you can reply on this
October 14th, 2009 at 7:49 am
I am a commerce graguateand having 7 years laboratory technician experiance.pls give me fully theortical details about concrete mix design
October 28th, 2009 at 6:18 am
R|sir, please tell me how to calulawe have required for What is the theoretical Mix Design Proportion te the cement quantity for m10,m15,m20,m25,m30,m35 & how to calculate
October 30th, 2009 at 12:17 pm
i want to know about SSD condition of raw material in trail mix.
November 4th, 2009 at 2:09 am
Thank U for ans
November 10th, 2009 at 5:36 am
Sir,
What is the importance of PCC usage under the stonemasonry retaining walls mean in foundation?
November 19th, 2009 at 2:42 am
pl send detail of Designe Mix
December 5th, 2009 at 6:47 am
Sir,
How i can calculate the proportion of concrete for all grade?
i mean if i want to do M-20 grade on site and i have 1.5feet dia tocker how can ido?
Please give me calculation method for components.
December 16th, 2009 at 5:17 am
Dear sir,
I am a civil engineer.
What are the mixing ratio for M30, M35, M40, M45, & M15
December 17th, 2009 at 11:07 pm
i would like to know about wat will be the ratio of m-20
December 19th, 2009 at 5:19 am
R/s…..
I need a mix design of Water Bound Mechanism, Granular Sub-base, Paver block preparation method with required QC test specification, Soil Mechanism & all concrete used in road construction field
Thanking You.
December 24th, 2009 at 10:57 am
pl send detail of Designe Mix M25
December 25th, 2009 at 10:59 pm
I’m Ajit Lamba (Draftsman civil Auto cad)
A very thanks for all the imformation
December 26th, 2009 at 4:19 am
I would like to know the total consumption individually of material for 1 m3 of m20 & m 25
December 28th, 2009 at 9:17 am
Please provide details of mix design M25
January 1st, 2010 at 5:56 am
Please provide Concrete mix design chart and send it to my email ID
January 4th, 2010 at 12:41 pm
very nice information.
please provide me all building materials testing methods with standard norms and deviation if possible on my email ID
(for bricks,steel,cement,fine and coarse agg.flush doors, conduit pipes, G.I.pipes,wires)
OR provide me sites name
thanks and waiting for ur reply
January 4th, 2010 at 2:13 pm
here you go
http://www.engineeringcivil.com/theory/material-testing
January 5th, 2010 at 11:05 am
Sir,
please give the details
of who to calculate strength of concrete
January 26th, 2010 at 1:44 am
dear sir
greetings to you
please give details of M30 design mix
January 30th, 2010 at 2:47 am
dear sir
greetings to you
please give details of M30 & M25 design mix. Also send what is the procedure of testing the M25 grade concreet bricks (300mm X 200MM x 75mm) at work site.
February 11th, 2010 at 7:38 am
Respected Sir
Please explain how we can applied or use of fineness modules in concrete mix design calculation , and mention method standard
February 26th, 2010 at 10:08 am
Very good informative content.Thank You.
February 26th, 2010 at 2:06 pm
iam a civil engineering student. why we are tesing a slump teston concrete?
how we find the workability on concrete?
March 11th, 2010 at 9:53 am
thank u v much i wish if there would be tabe contane all grade specfications in one place