Ex if std no: 1abcde, 161667 (a=6, b=1, c=6, d=6,e=7)
In my case std 174702
Q1) Design a concrete mix by using ACI Method of Mix Design having28-day characteristic mean strength of 2a MPa for a deck of aresidential building at Nebraska. Dry weather and gradually warmingtemperatures may be expected throughout the working week. Freshconcrete composed of a slump of 90 mm and maximum aggregate size of25 mm. Determine the amount of water reducing admixture to be usedfor 0.2b % and 0.c5 %. Deck is a flat surface capable of supportingweight, similar to a floor, but typically constructed outdoors,often elevated from the ground, and usually connected to abuilding. Decks that need piers or footings must have theminstalled below the frost line. This will keep the piers fromheaving up out of the ground from the strength of the freeze.Reinforcing steel will help keep the piers from cracking. Thefreeze or frost line is the depth to which the soil freezes or hasbeen known to freeze at some point in the past. It is absolutelycritical that the foundations of buildings extend below this pointin a soil profile. Except for a few arid locations, soils typicallycontain water and this water expands approximately nine percent involume when it freezes. The frost line depth is not consistentaround the nation because there is such a dramatic difference inclimate from state to state. Deck is composed of 2.5 cmreinforcement and there is no need for piers. The materialproperties are as follows:
For Coarse aggregate: SSD bulk specific gravity: 2.75, absorptioncapacity = 1.5 %, total moisture: 2.5 %, Dry-rodded unit weight:15de kg/m3.
For Fine aggregate: SSD bulk specific gravity: 2.65, absorptioncapacity = 1.0 %, surface moisture: 3 %, F.M: 2.6.
Cement: Type V, Sp.Gravity: 3.23
Probability constant: 1.22 and standard deviation: 2 MPa