(Solved): Question 2 Figure (1) below shows a cross section of a concrete column located in Dubai. The targe ...

Question 2 Figure (1) below shows a cross section of a concrete column located in Dubai. The target 28-day compressive strength of the concrete is 35 MPa. The coarse aggregate has a S.S.D. specific gravity of 2.65 and a dry-rodded unit weight of 1780 kg/m³. The fine aggregates have a S.S.D. specific gravity of 2.54 and a fineness modulus of 2.7, determine: a) The maximum size of aggregates when used for the concrete column shown in figure (1). b) Mix design of concrete using the ACI method c) The batch weights of materials needed for pouring 22 columns like the one in figure (1) assuming 10% losses, knowing that the column height is 3.25 m d) The batch weights in a 20 m³ concrete truck if: i. All aggregates have 0.67% surface moisture ii. Coarse aggregates have 1.25 % surface moisture and fine aggregates have a saturation potential of 0.84% e) What would differ in your design if the project was in a region with freezing conditions? Why would you make these changes? f) Describe the properties of the mix when silica fumes and superplasticizers are added and state the approximate amount of silica fumes and superplasticizers you are going to use in the mix. I... 400 mm 450 mm Reinforcement Bars: 16 Stirrups: 08 Concrete cover: 40 mm