Q-The strength of a fully matured concrete sample is 500 kg/cm². When cured at an average temperature of 20°C in day, 10°C in night, datum temperature To is -11°C. If Plowman constants A is 32 and B is 54, find the strength of identical concrete at 7 days.

Standard deviation is 3.6 MPa

The strength of a fully matured concrete sample is 500 kg/cm². When cured at an average temperature of 20°C in day, 10°C in night, datum temperature T is -11°C. If Plowman constants A is 32 and B is 54, the strength of identical concrete at 7 days will be nearly

Use ACI method .

Cracking Analysis of Reinforced Concrete ANSWER A. TO G. COMPLETE SOLUTIONS -positive bending moment = +200KNm -draw transformation of areas -draw strain and stress diagram

Design the concrete mix according to the following conditions:Design EnvironmentPavement slab, subjected to freezingRequired design strength = 21 MPaSlab thickness = 300 mmStatistical data indicate a standard deviation of compressive strength of1.7 MPa is expected (more than 30 samples).Only air entrainer is allowed.Available MaterialsAir entrainer: Manufacture specification is 9.5 mL/1% air/100 kgcement.Coarse aggregate: 2 in. nominal maximum size, crushed stoneBulk oven-dry specific gravity = 2.573, absorption = 2.8,Oven-dry rodded density = 1922 kg/m3Moisture content = 1,Fine aggregate: Natural sandBulk oven-dry specific gravity = 2.540, absorption = 3.4,Moisture content = 4.5,Fineness modulus = 2.68

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Design the concrete mix according to the following conditions:Design Environment• Building beamo Required design strength = 27.6 MPao Minimum dimension = 150 mmo Minimum space between rebar = 40 mmo Minimum cover over rebar = 40 mmo Statistical data indicate a standard deviation of compressive strengthof 2.1 MPa is expected (more than 30 samples).• Only air entrainer is allowed.• Moderate Sulphate exposure.• Available Materialso Air entrainer:▪ Manufacture specification 6.3 mL/1% air/100 kg cement.o Coarse aggregate:▪ 19 mm nominal maximum size▪ River gravel (rounded)▪ Bulk oven-dry specific gravity = 2.55▪ Absorption = 3.6▪ Oven-dry rodded density = 1761 kg/m3▪ Moisture content = 2.5o Fine aggregate:▪ Natural sand▪ Bulk oven-dry specific gravity = 2.659▪ Absorption = 0.5▪ Moisture content = 2▪ Fineness modulus = 2.47o Cement▪ Type II (Moderate Sulphate Resistant)▪ Specific Gravity = 3.15Based on this information, find the following and summarize the findings in a table d) The amount…

Concrete question.civil.engg.

Concrete basics.