Fresh Concrete Properties
Table 4-2 shows the results of Slump and Air Content tests. The slump tests were
performed in accordance with ASTM C143. The objective was to maintain the slump in
3"1 '2". Air Content tests were run according to ASTM C231. Air temperature and mix
temperature were measured at the time of placing concrete in hydration Chambers. Water
to Cementitious Material Ratio was calculated using following equation:
WCr= Ww / W Equation 4-1
Where:
WCr= Water to Cementitious Material Ratio
Ww= Weight of Water in lbs from Table 4-1
W,= Weight of Total Cementitious Materials (Cement + Fly Ash or Slag) in lbs
from Table 4-1
Weight of Total Cementitious Materials (Cement + Fly Ash or Slag) and water was
constant, therefore WCr equal to 0.37 in all mixes.
Unit weight was calculated by dividing the summation of all materials weights
from Table 4-1 by mix volume. For example unit weight of mix 73A00P was calculated
as follows:
Weight of Cement = 760 lbs
Weight of Water = 279 lbs
Weight of Fine Aggregate = 1033 lbs
Weight of Coarse Aggregate = 1736 lbs
Weight of Air Entertainer + Admixture = 2.3+68.20 = 70.50 oz = 4.41 lbs
Total of Weight of Mix Materials = 3812.41 lbs Mix Volume = 1 CY = 27 CF