what would be the average compressive strength of concrete if the load at failure of the 3 trials are 55,100 kg 54,800 kg and 55,200 kg. Diameter of the sample is 6" a. 31.1 MPa b. 30.6 MPa c. 31.6 MPa

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You are assigned to monitor the concrete strength gain at a construction site. The ultimate compressive strength of the concrete at its full maturity is 450 kg/m. The average concrete temperature at the construction site is 25 °C during the day and 15 °C during the night (assuming 12-hour day/night cycles). If you assume that the datum temperature (To) is - 10 °C, estimate the strength of concrete after 14 days. (4=35, B=51)Maturity Index, M = E(T - To).

Please solve the following problem with step by step soutions

Determine the permanent deformation after 2 hours show all work

Maximum strain in concrete taken for design is 0.0040 while strain in deformed bar is calculated with an offset at 0.0015. A beam has an effective depth of 550 mm and is reinforced with Fe415 steel. What would be the value of limiting neutral axis depth (in mm) for this beam?

A 150mm diameter cylindrical concrete specimen was tested for splitting tensile strength. The Sample failed when the applied force was 120 kN. What is the splitting tensile stress at failure in MPa? The sample length is 300mm

(ii) Calculate the stresses at interior, edge and corner regions of a cement concrete pavement using Westergaard's stress equations. Use the following data: Wheel load, P = 5100 kg Modulus of elasticity of cement concrete, E=3.0 x 105kg/ cm² Pavement thickness, h = 18 cm Poission's ratio of concrete, μ = 0.15 Modulus of subgrade reaction, K = 6.0 kg/cm³ Radius of contact area, a = 15 cm

1- Daw the strain and stress diagrams for untracked plain concrete shown below. Developed the tension and compression expressions? Materials are given as: f'c=X1 MPa, fr=0.07X1 MPa X1=72.1 X2=620.4 X3=144.2 X3 mm 1- Consider a rectangular column subjected to axial compression. The material stress-strain relationships have been idealized as shown below. a) What axial load will cause concrete to be at its maximum working stress? b) find the axial load P which produces & = & = 0.0012 1.75 X3