Ex if std no: 1abcde, 161667 (a=6, b=1, c=6, d=6, e=7) In mycase std 173009 Q1) Design a concrete mix by using ACI Method ofMix Design having 28-day characteristic mean strength of 2a MPa fora deck of a residential building at Nebraska. Dry weather andgradually warming temperatures may be expected throughout theworking week. Fresh concrete composed of a slump of 90 mm andmaximum aggregate size of 25 mm. Determine the amount of waterreducing admixture to be used for 0.2b % and 0.c5 %. Deck is a flatsurface capable of supporting weight, similar to a floor, buttypically constructed outdoors, often elevated from the ground, andusually connected to a building. Decks that need piers or footingsmust have them installed below the frost line. This will keep thepiers from heaving up out of the ground from the strength of thefreeze. Reinforcing steel will help keep the piers from cracking.The freeze or frost line is the depth to which the soil freezes orhas been known to freeze at some point in the past. It isabsolutely critical that the foundations of buildings extend belowthis point in a soil profile. Except for a few arid locations,soils typically contain water and this water expands approximatelynine percent in volume when it freezes. The frost line depth is notconsistent around the nation because there is such a dramaticdifference in climate from state to state. Deck is composed of 2.5cm reinforcement and there is no need for piers. The materialproperties are as follows: For Coarse aggregate: SSD bulk specificgravity: 2.75, absorption capacity = 1.5 %, total moisture: 2.5 %,Dry-rodded unit weight: 15de kg/m3. For Fine aggregate: SSD bulkspecific gravity: 2.65, absorption capacity = 1.0 %, surfacemoisture: 3 %, F.M: 2.6. Cement: Type V, Sp.Gravity: 3.23Probability constant: 1.22 and standard deviation: 2 MPa.
