A CONCRETE MATERIALS (A) ( ^[5]) ( ^[26]) ( ^[50]) ( ^[58]) ( ^[60]) ( ^[61])

1. General Cast-in-Place Costs

   1. Substructure: $150 to $400/CY (40% M and 60% L)

   2. Superstructure: $500 to $1100/CY (30%M and 70%L)

2. Concrete: Consists of (using the general 1-2-3 mix. 1 part cement, 2 parts sand, and 3 parts rock, plus water):

   1. Portland cement

      1. Type I: Normal for general construction.

      2. Type II: Modified for a lower heat of hydration, for large structures or warm weather.

      3. Type III: Modified for high, early strength, where forms must be removed as soon as passible, such as high-rise construction or cold weather.

      4. Type IV: Modified for low heat for very large structures.

      5. Type V: Modified for sulfate resistance.

      6. Types IA, IIA, or IIIA: Air-entrained to resist frost.

   2. Fine aggregate (sand): ? or smaller.

   3. Course aggregate (rock and gravel): ? to 2 ?.

   4. Clean water: Just enough to permit ready working of mix into forms. Mix should not slide or run off a shovel. Major factor effecting strength and durability is the water-cement ratio, expressed as gallons of water per sack of cement (usually ranging from 5 to 8). Slump is a measure of this:

      

3. Structural Characteristics (Primer)

   1. Strength

      AVERAGE PHYSICAL PROPERTIES
      MATERIAL	ELASTIC LIMIT (PSI)	ULTIMATE STRENGTH (PSI)	ALLOWABLE WORKING UNIT STRESS (PSI)	MODULE OF ELAST. (PSI)	WEIGHT (LS./C.F.)
      TENSION	COMPRESS.	TENSION	COMPRESS.	SHEAR	TENSION	COMPRESS	SHEAR	EXTRA. FIBER BAND
      CONCRETE				2500