final bid specs 09328.pdf - Freese and Nichols, Inc.

B Not Used 3000 6 1½” / 467
C Not Used 3000 5 1” / 57
D Not Used 4000 5 1” / 57
E Not Used 4000 4 1½” / 467
1. Maximum Slump for Concrete Containing High-Range Water-Reducing Admixture: 8
inches after admixture is added to concrete with initial slump of 2- to 4-inch.
D. Slab-on-Grade: Proportion normal-weight concrete mix as follows:
1. Paste Fraction: 25 to 38% by volume
a. Paste fraction is the ratio of paste volume to the total mix volume.
b. Paste is defined as the cementitious materials + entrained air + water.
2. Mortar Fraction: 55 to 57% by volume
a. Mortar Fraction is the ratio of Mortar to the total mix volume.
b. Mortar is defined as the Paste + W.
c. Where W(fine aggregate) is that portion of the combined aggregates passing the #8
sieve.
3. Coarseness Factor: 50 to 75%
a. Coarseness Factor is defined as: Q / (Q + I)
b. Where Q (coarse aggregate) is the percentage of the combined aggregate greater
than 3/8-inch and I (intermediate aggregate) is the percentage of the combined aggregate
between the 3/8-inch and #8 sieves.
4. Workability Factor: 32 to 42%
a. Workability factor is defined as: W / (Q + I + W)
E. Maximum Water-Cementitious Materials Ratio: 0.45.
F. Air Content: Add air-entraining admixture at manufacturer's prescribed rate to result in concrete
at point of placement having an air content of 2 to 4 percent, unless otherwise indicated.
1. Exterior Concrete: Add air-entraining admixture at manufacturer's prescribed rate to result
in concrete at point of placement having an air content as follows within a tolerance
of plus 1 or minus 1.5 percent, unless otherwise indicated:
a. Air Content: 5.5 percent for 1-1/2-inch nominal maximum aggregate size.
G. Do not air entrain concrete to trowel-finished interior floors and suspended slabs. Do not allow
entrapped air content to exceed 3 percent.
H. Limit water-soluble, chloride-ion content in hardened concrete to 0.15 percent by weight of
cement.
I. Admixtures: Use admixtures according to manufacturer's written instructions.
1. Use water-reducing admixture or high-range water-reducing admixture (superplasticizer)
in concrete, as required, for placement and workability.
2. Use water-reducing and retarding admixture when required by high temperatures, low
humidity, or other adverse placement conditions.
Cast-in-Place Concrete 03 30 00 - 7
DPR09328