HenceVolume of all in aggregate = 1 – [{394.8/(3.15×1000)} + {197.4/(1 x 1000)}] = 0.6773 mMass of coarse aggregate = 0.6773 x 0.558 x 2.84 x 1000 = 1073.33 kg/mMass of fine aggregate = 0.6773 x 0.442 x 2.64 x 1000 = 790.3 kg/mFor casting trial -2, 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 very cohesive, workable and had a true slump of about 60 mm.It virtually flowed during vibration but did not exhibit any segregation and bleeding.So , it has achieved desired workability by satisfying the requirement of 50-75 mm slump value .In case of trial mix 3 water cement ratio is varied by +10% keeping water content constant. To determine the proportions you have to perform mix design, for this you have to find out the sp.gr. 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. Concrete mix ratios are prescribed ratio of cement, sand and aggregate to get the desired strength of concrete. And ratio of grade of concrete.grade of concrete are categorized into nominal grade of concrete, standard grade of concrete and high strength concrete.grade of concrete like m5, m 7.5,m10,m15, m 20 are called as nominal mix grade of concretegrade of concrete like m25, m 30, m 35, m 40, m 45 are called as standard grade of concretethe grade of concrete like m50 ,m55,m60,m65,m70 are known as high strength concrete.Strength of concrete commonly known as characteristics compressive strength and it is represented by fck. In which m is stand for concrete mix design and numerical figure 5,7.5 ,10, 15 and 20 is characteristics compressive strength of concrete after 28 days of casting and curing time generally it is represented as 5 N/mm2, 7.5N/mm2, 10N/mm2, 15N/mm2 , 20N/mm2 respectively.it means fck value for m20 grade of concrete is 20 N/mm2.Compressive strength of grade of concrete such as M5,M7.5,M10,M15,M20 are 5 N/mm2,7.5 N/mm2,10 N/mm2,15 N/mm2 and 20 N/mm2 respectively.Different grade of concrete have different concrete mix ratio . M20 (1 cement :1.5 sand :3 stone/brick aggregate). In this case standard deviation is taken from IS:456 against M 20 is 4.0.Maximum water-cement ratio for Mild exposure condition = 0.55Based on experience, adopt water-cement ratio as 0.5.Maximum water content = 186 Kg (for Nominal maximum size of aggregate — 20 mm)Estimated water content = 186+ (3/100) x 186 = 191.6 kg /mMinimum cement Content for mild exposure condition = 300 kg/mThis value is to be checked for durability requirement from IS: 456.In the present example against mild exposure and for the case of reinforced concrete the minimum cement content is 300 kg/mVolume of coarse aggregate per unit volume of total aggregate = 0.62Volume of coarse aggregate per unit volume of total aggregate = 0.62 x 90% = 0.558b) Volume of cement = (Mass of cement / Specific gravity of cement) x (1/100)c) Volume of water = (Mass of water / Specific gravity of water) x (1/1000)d) Volume of total aggregates = a – (b + c ) = 1 – (0.122 + 0.1916) = 0.6864 me) Mass of coarse aggregates = 0.6864 x 0.558 x 2.84 x 1000 = 1087.75 kg/mf) Mass of fine aggregates = 0.6864 x 0.442 x 2.64 x 1000 = 800.94 kg/mFor trial -1 casting of concrete in lab, to check its properties.For casting trial -1, mass of ingredients required will be calculated for 4 no’s cube assuming 25% wastage.Volume of concrete required for 4 cubes = 4 x (0.15Since the aggregate is saturated surface dry condition hence no correction is required.The mix proportion as calculated in Step 6 forms trial mix1.
The Minimum grade of concrete for Reinforced Cement Concrete (RCC) is M20 Concrete Grade and Mix Ratio Table As per IS 456:2000, the grades less than M20 should not be used in RCC works And benefits of concrete mix design is that it provides the right proportional material making the concrete construction economical in as required characteristics of compressive strength of structural member. M20 grade of concrete and their mix ratio ,hi guys in this article we know about grade of concrete and m20 grade of concrete mix ratio and ratio of grade of concrete like m5, m 7.5, m10, m15, m 20, m25 and so more. 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 paste is also called as concrete.
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