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Q5. (15 %) A laboratory study was conducted to evaluate the performances of three different materials to be used for repair purposes. Time dependent drying shrinkage, instantaneous and tensile creep strains under service loads of these materials are given in the following table. Drying shrinkage (PE) Tensile Creep Strain Instantaneous Material Tensile Strain (1) 7 days 90 days 7 days 90 days 1 300 550 40 80 2 250 480 40 10 3 150 400 50 305 100 (u 120 90 i. Calculate the cracking potentials at 7 and 90 days, compare the cracking potentials and decide the best material to be used for repair works? ii. Calculate the time of first cracking for each material (at 7 or at 90 days)? Q5. (15 %) A laboratory study was conducted to evaluate the performances of three different materials to be used for repair purposes. Time dependent drying shrinkage, instantaneous and tensile creep strains under service loads of these materials are given in the following table. Drying shrinkage (PE) Tensile Creep Strain Instantaneous Material Tensile Strain (1) 7 days 90 days 7 days 90 days 1 300 550 40 80 2 250 480 40 10 3 150 400 50 305 100 (u 120 90 i. Calculate the cracking potentials at 7 and 90 days, compare the cracking potentials and decide the best material to be used for repair works? ii. Calculate the time of first cracking for each material (at 7 or at 90 days)