m20 mix design calculation
Concrete mix design is a method of calculating right proportions of cement, sand, and aggregates for concrete to achieve target strength in structures. We are thankful to him for his excellent service. Can you please post it in detail.go for trials to arrive at optimized mix i.e. 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. As, the quantity of concrete required for large constructions are huge, economy in quantity of materials such as cement makes the project construction economical.Concrete Mix design of M20, M25, M30 and higher grade of concrete can be calculated from example below. On the other hand, if the aggregates are already dry , the amount of water mixed should be increased by an amount equal to the moisture likely to be absorbed by the aggregates. Reduce water content by 3% (for every 25 mm increase)Cement Content = Water content / “w-c ratio” = (191/0.50) = 382 kgsMinimum cement Content for moderate exposure condition = 300 kg/m3If the mix is cohesive and slump was true ,we can infer that there would be no change in Volume of coarse aggregate = 0.60The mix calculations per unit volume of concrete shall be as follows:Sand being of Zone – I i.e. 2 The mix design is based on the quality and grading of the materials actually supplied, by the client.
For a mix design of concrete, we have to follow various steps, calculations, and laboratory testing to find the right mix proportions. The mix proportions shall be reworked for the actual water content and checked for durability requirements.Two more trials having variation of +/- 10% of water cement ratio shall be carried out and a graph between three water-cement ratios and their corresponding strength shall be plotted to work out the mix proportions for the given target strength for field trials. Incase you want to convert the requirement of Sand and Aggregate in Cum; 1 Cum = 35.31 Cft Eyeopener:Many popular blogs claim M20 nominal mix as 1:1.5:3 ,however we strongly differ by same.Through this blog,we are also trying to address the same myth which is being carried forward since last 4 decades.. 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. VIP members get additional benefits.Lost your password? With this proportion, concrete is manufactured and tested for fresh concrete properties requirement i.e. Please enter your email address. He is the founder of The Constructor.Concrete Mix Design Calculation for M20, M25, M30 Concrete with Procedure & Example Concrete Mix Design Step by Step full Calculation 14/01/2019 Mike Mahajan CONCRETE TECHNOLOGY , CONSTRUCTION MATERIALS 2 comments Concrete mix design is the process of detrmining right proportions of cement, sand and aggregates for concrete to achieve target strength of concrete. 0.60 .Note 2: Incase the coarse aggregate is not angular one, then also volume of coarse aggregate may be required to be increased suitably based on experience.The mix calculations per unit volume of concrete shall be as follows:Note-1: Aggregates should be used in saturated surface dry condition.
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. Concrete Mix Design Calculation : M20, M25, M30, M40 Grade Concrete 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. Dear Sir Can you send me the standard IS-10262-2009. Concrete mix design is the process of finding right proportions of cement, sand and aggregates for concrete to achieve target strength in structures.
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