This category only includes cookies that ensures basic functionalities and security features of the website. Can you please post it in detail.go for trials to arrive at optimized mix i.e. I STIPULATIONS FOR PROPORTIONING. Concrete mix design is a procedure of selecting the suitable ingredients of concrete and their relative proportions with an objective to prepare concrete of certain minimum strength, desired workability and durability as economically (value engineered) as possible.As we decide to go for a concrete mix design, collect the following data before hand as few design stipulation are freezed on the basis of these data.Purely governed on the local conditions, were the concrete need to be appliedThe exposure condition limits the minimum cement content, maximum water – cement ratio and minimum grade of concrete.As per exposure condition, you have the above data for working the first trial and arriving its mix proportion.If you are getting desired result at a lower cement content, you need to put extra as mentioned by IS 456. So, what really does M10 or M20 mean or represent.“M” stands for “mix”. These cookies do not store any personal information.Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. With corrected proportions three concrete cubes are cast and tested for 28 days compressive strength.A summary of all the trial mixes is given in the following Table.From Compressive Strength vs. c/w graph for target strength 31.6 MPa we get,= 1 – [{448.6/(3.15 x 1000)} + (197.4/1000)] = 0.660 mA reduction of 0.05 in w/c will entail and increase of coarse aggregate fraction by 0.01.Mass of coarse aggregate = 0.660 x 0.568 x 2.84 x 1000 = 1064.65 kg/mMass of fine aggregate = 0.660 x 0.432 x 2.64 x 1000 = 752.71 kg/mGopal Mishra is a Civil Engineer from NIT Calicut and has more than 10 years of experience in Civil Engineering and Construction. This process is usually adopted for structures which requires higher grades of concrete such as M25 and above and large construction projects where quantity of concrete consumption is huge..Benefits of concrete mix design is that it provides the right proportions of materials, thus making the concrete construction economical in achieving required strength of structural members. Hence, a balance has to be found in the construction site during concrete mixing. But if you keep water too low, workability of water will also reduce. (a) Characteristic compressive strength required in the field at 28 days grade designation — M 25(d) Degree of workability required at site — 50-75 mm (slump)(e) Degree of quality control available at site — As per IS:456(f) Type of exposure the structure will be subjected to (as defined in IS: 456) — Mild(d) Aggregate are assumed to be in saturated surface dry condition.Himsworth constant for 5% risk factor is 1.65. We all know that on mixing cement with sand, stone/aggregates and water, a paste will form which can be used to bind the building materials together. Is it different for grade M40 concrete?The steps remain same the relevant table “column/row’ to be picked for inputs ,for designing M40 grade concrete.Also reduction of cement when fly ash or GGBS used.Here is the mix design when cement is replaced by flyash (plz post the mix design when natural coarse agg is replaced by recycled agghave a comparative study done, you will have the deviations in case the aggregate are replaced with recycled aggregate ,then make necessary tweaks in concrete mix designs with recycled aggregate to get the required resultscan the values be halved (final number of CA, FA, cement and water) for a volume of concrete = 0.5 cubic metersThe above is a trial design mix. And the number following “M” represents compressive strength of that concrete mix in N/mmHere is the standard chart table showing various grades of concrete mix design along with their respective ratios of cement, sand and aggregates required.As you can see in the table above, volume of sand is always kept half of that of aggregates in these standard mix designs. At my site, for building construction, the M30 is being used. The strength of this concrete mix is determined by the proportion on which these cement, sand, stones or aggregates are mixed. Considering the durability requirements too. The “M” refers Mix and Number after M (M10, M20) Indicates the compressive strength of concrete after 28 days of curing and testing.. M indicates the proportion of materials like Cement: Sand: Aggregate (1:2:4) or Cement: Fine Aggregate: Coarse Aggregate.. M30 represents the concrete mixture that, after 28 days of curing, will give a resistance of 30 N / mm 2. Greater the amount of water, higher will be the workability of concrete (more fluid) however it reduces the strength of concrete. 2. Amount of water required may vary for same volume of concrete for various grades of concrete. Estimated water content for 100 Slump = 186+(6/100) X 186 = 197 litreCement Content = Water content / “w-c ratio” = (197/0.50) = 394 kgsMinimum cement Content for moderate exposure condition = 300 kg/m3From Table 3 of IS 10262- 2009, Volume of coarse aggregate corresponding to 20 mm size and fine aggregate (Zone I) = 0.60Note 1: In the present case water-cement ratio is 0.5.So there will be no change in coarse agreegate volume i.e. Some of them are: M10, M20, M30, M35, etc. In the present example water cement ratio is raised to 0.55 from 0.5.An increase of 0.05 in the w/c will entail a reduction in the coarse aggregate fraction by 0.01.Hence the coarse aggregate as percentage of total aggregate = 0.558 – 0.01 = 0.548= 1 – [{(358.9/(3.15 x 1000)} + (197.4/1000)] =0.688 mMass of coarse aggregate = 0.688 x 0.548 x 2.84 x 1000 = 1070.75 kg/mMass of fine aggregate = 0.688 x 0.452 x 2.64 x 1000 = 821 kg/mFor casting trial -3, mass of ingredients required will be calculated for 4 no’s cube assuming 25% wastage.Volume of concrete required for 4 cubes = 4 x (0.15Mix is stable, cohesive, and workable and had a true slump of about 75 mm.So , it has achieved desired workability by satisfying the requirement of 50-75 mm slump value .In this case water / cement ratio is decreased by 10% keeping water content constant.A reduction of 0.05 in w/c will entail and increase of coarse aggregate fraction by 0.01.= 1 – [{438.7/(3.15 x 1000)} + (197.4/1000)] = 0.664 mMass of coarse aggregate = 0.664 x 0.568 x 2.84 x 1000 = 1071.11 kg/mMass of fine aggregate = 0.664 x 0.432 x 2.64 x 1000 = 757.28 kg/mFor casting trial -4, mass of ingredients required will be calculated for 4 no’s cube assuming 25% wastage.Volume of concrete required for 4 cubes = 4 x (0.15A local correction due to moisture condition of aggregate is again applied on this proportions.
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