حفظ إلغاء إعادة تراجع النص الممحاة القلم N T ARE 211 Building Materials Tutorial 3 Exercise 7.22 :A normal-weight concrete has an average compressive strength of 35 MPa. What is the estimated modulus of elasticity? Exercise 7.28: Consider a standard flexural strength specimen of length L, width a, and depth a. Assume third point loading where the load at failure from the test machine is P, which is distributed evenly (1/2 to each) over the two loading points. Derive the equation for calculating the modulus of rupture of the beam in terms of P, L, and a. Exercise 7.29: The third-point loading flexure strength test was performed on a concrete beam having a cross section of 0.15 m by 0.15 m and a span of 0.45 m. If the load at failure was 35.7 kN, calculate the flexure strength of the concrete. Exercise 7.32: A normal-weight concrete has an average compressive strength of 20 MPa. What is the estimated flexure strength? Exercise: The splitting tensile strength test was performed on a concrete cylinder (dia. = 150 mm L=300 mm. If the load at failure was 247 kN, calculate the tensile strength of the concrete. ۱/۲ 7