What is the value of the Whitney stress block parameter, β1β1, for 6000 psi concrete?
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What is the value of the Whitney stress block parameter, β1β1, for 6000 psi concrete?
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- A hollow concrete masonry unit has an actual dimension of 150mm x 200mm x 400mm(W x H x L). The unit was tested in a compression machine with the following result.Failure load = 1,200 kNNet volume = 4,400,000 mm3Determine: a) the gross area compressive strength.b) the net area compressive strength.Why is the compression test the one most frequently made for concrete?A concrete specimen with b = d is supported at both ends 600mm apart. It is tested for flexure strength with load at midspan of 100kN and failed with a flexural stress of 52.083 MPa. What is the dimension b and d of the specimen in mm?
- A normal-weight concrete has an average compressive strength of 20 MPa. What is the estimated flexural strength in MPa?The required design strength is 5000 psi No variation for the statistical variation in concrete strength pleaseEstimate the modulus of elasticity and the shear modulus of a concrete specimen with a dry density of 150 pcf (2400 kg/m3) and compressive strength of 4500 psi (31MPa) using Poisson’s ratio, ? =0.18.
- A normal-weight concrete has an average compressive strength of 31 MPa. What is theestimated modulus of elasticity?What is the stress in an 8-inch round x 16-inch high concrete cylinder (E = 2.5 x 10^6 psi) when the unit deformation is 0.0012 inch/inch? A. 500 psiB. 8100 psiC. 210 psiD. 3000 psiA group of concrete cubes mixed with different water ratios .. The group with water ratio W / c = 0.3The maximum load was testedFailure causes every cube in the group Required:1- Finding the stress rate for each group in unit N / mm2 with discussing the results and the effect of the water w / c ratio on the compressive strength of the group.
- SCC and Plain Concrete Why does the unit weight decrease as the slump increases?A copper flat measuring 60mmx30mm is brazed to another 60mmx60mm mild steel flat as shown. If the combination is heated through 120 ℃, determine the stress produced in each of the bar. Concrete: ? = 18.5x10^-6/℃, ?? = 110 GN/?2 Steel: ? = 12x10^-6/℃, ?? = 220 GN/?2 Length of each flat = 400 mm.A hollow concrete masonry unit has actual gross dimensions of 190 mm X190 mm X 390 mm (width X height X length). The unit is tested in a compression machine with the following results:Failure Load = 1110 kNNet volume of 6 X 106 mm3a. Calculate the gross area compressive strength.b. Calculate the net area compressive strength.