Q5) Prepare a mix design (Use ACI Method of Mix Design) whichwill be used for a pier located at the South Carolina. SouthCarolina is hot and humid with daytime temperatures averagingbetween 30–34 °C in most of the state and overnight lows averaging21–23 °C on the coast and from 19–23 °C inland. Winter temperaturesare much less uniform in South Carolina. Coastal areas of the statehave very mild winters with high temperatures approaching anaverage of 16 °C and overnight lows in the 5-8 °C. Inland, theaverage January overnight low is around 2 °C in Columbia and justbelow freezing in the Upstate. While precipitation is abundant theentire year in almost the entire state, the coast tends to have aslightly wetter summer, while inland March tends to be the wettestmonth. Pier will be constructed during winter season. The specifiedstrength is 29 MPa at 28 days and it is required that no more than2 test result in 400 will fall below the specified strength. Thesieve analysis result of used aggregate is given in Table.

BS Sieve   Mass Retained (gr)
10.0 mm   0
5.00 mm   8
2.36 mm   27
1.18 mm   43
600 ?m   51
300 ?m   90
150 ?m   39
< 150 ?m   10

For the other properties of fine aggregate, a specified amountof sand particles were taken from stockpile to determine thephysical properties. 490 gr of saturated surface dry aggregate wasprepared for this test. Mass of container was filled with water andweighted as 1437 gr. Then sand particles were added to thecontainer which were initially filled by water and weighted as 1605gr and after 24 hours the samples were taken from oven and weightedas 480 gr.

For Coarse aggregate: SSD bulk specific gravity: 2.75,absorption capacity = 1.5 %, total moisture: 2.5 %, Dry-rodded unitweight: 1500 kg/m3.
Cement: Type V, Sp.Gravity:3.1. For 0.34 m3 of concrete the cementcontent should not be exceeded 110 kg.