Concrete Mixtures for Building Elements

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A. Footings: Proportion normal-weight concrete as follows.

  1. Compressive Strength: 3000 PSI at 28 days.
  2. Maximum Water-Cement RatioL 0.55
  3. Slump Limit: 2-4" with Normal Water Reducer. 4-6" with Mid-Range Water Reducer. 6-8" with High Range Water Reducer.
  4. Air Content: 6.5 percent, plus or minus 1.5 percent at the point of delivery for 1-inch nominal maximum aggregate size. 


B. Footings/Foundations: Proportion normal-weight concrete as follows:

  1. Compressive Strength: 4000 PSI at 28 days.
  2. Maximum Water-Cement Ratio: 0.50 
  3. Slump Limit: 2-4" with Normal Water Reducer. 4-6" with Mid-Range Water Reducer. 6-8" with High Range Water Reducer.
  4. Air Content: 6.5 percent, plus or minus 1.5 percent at the point of delivery for 1-inch nominal maximum aggregate size.


C. Slab on Grade: Proportion normal-weight concrete as follows:

  1. Compressive Strength: 4000 PSi at 28 days
  2. Maximum Water-Cement Ratio: 0.48
  3. Slump Limit: 2-4" with Normal Water Reducer. 4-6" with Mid-Range Water Reducer. 6-8" with High Range Water Reducer. 
  4. Air-Content: 4% Max - No entrained air allowed.


D. Slab on Grade: Proportion normal-weight concrete as follows: 

  1. Compressive Strength: 4000 PSI at 28 days
  2. Maximum Water-Cement Ratio: 0.48
  3. Imported Sand - Past service history free from aggregate popouts.
  4. Slump Limit: 2-4" with Normal Water Reducer. 4-6" with Mid-Rnge Water Reducer. 6-8" with High Range Water Reducer.
  5. Air Content: 4% Max - No entrained air allowed.


E. Suspended Slabs/Toppings: Proportion normal-weight concrete as follows:

  1. Compressive Strength: 4000 PSI at 28 days.
  2. Maximum Water-Cement Ratio: 0.48 
  3. Slump Limit: 2-4" with Normal Water Reducer. 4-6" with Mid-Range Water Reducer. 6-8" with High Range Water Reducer. 
  4. Air Content: 4% Max - no entrained air allowed.


F. Exterior Slabs: Proportion normal-weight concrete as follows.

  1. Compressive Strength: 4000 PSI at 28 days
  2. Maximum Water-Cement Ratio: 0.45
  3. Slump Limit: 2-4" with Normal Water Reducer. 4-6" with Mid-Range Water Reducer. 6-8" with High Range Water Reducer. 
  4. Air Content: 6.5 percent, plus or minus 1.5 percent at the point of delivery for 1-inch nominal maximum aggregate size. 


G. Columns/Beams: Proportion normal-weight concrete as follows:

  1. Compressive Strength: 5000 PSI at 28 days. 
  2. Maximum Water-Cement Ratio: 0.45 
  3. Slump Limit: 2-4" with Normal Water Reducer. 4-6" with Mid-Range Water Reducer. 6-8" with High Range Water Reducer.
  4. Air Content: 6.5 percent, plus or minus 1.5 percent at the point of delivery for 1-inch nominal maximum aggregate size. 


H. Industrial Slabs.

  1. Compressive Strength: 4000 PSI at 28 days.
  2. Maximum Water-Cement Ratio: 0.53
  3. Imported Sand - Past service history free from aggregate popouts.
  4. Adjust proportions of combined coarse, intermediate, and fine aggregates to provide the following particle size distribution characteristics, unless otherwise approved:
    1. Coarseness Factor of 60-70%.
      • The Coarseness Factor (CF) is the percent of combined aggregate retained on #8 sieve/Aggregate retained on the #8 sieve. 
      • The Coarseness Factor is calculated as follows: CF=Aggregate retained on the 3/8" sieve/Aggregate retained on teh #8 sieve.
    2. Adjusted Workability Factor (Adj-WF) is calculated as follows:
      • The Workability Factor (WF) is the percent of combined aggregate that passes the #8 sieve.
      • The Adjusted Workability Factor (Adj-WF) is calculated as follows: Adj-WF=WF+[Cementitious Material-564lbs)/37.6]
      • The range of accepted Adj-WF for a given CF is as follows: Adj-WF=[(11.25-.15CF)+35.5]+2.5
    3. Combined percent retained on any given sieve size shall not exceed 24%.
    4. Graduation requirement of ASTM C33 may be waived in order to meet ranges specified. 
  5. Slump Limit: 2-4" with Normal Water Reducer. 4-6" with Mid-Range Water Reducer. 6-8" with High Range Water Reducer. 
  6. Air Content: 4% Max - No entrained air allowed.