11/22/2017
Properties of Concrete
On Site Concrete Testing (2)
- Strength - Permeability - Shrinkage -Creep
• Concrete strength unclear after pour • Take cores of the columns and slabs • Cast in Place Punch Out Cylinder
Properties of Cement Matrix
Concrete Testing
On Site Concrete Testing (3)
• Stronger in compression than in tension • Cylindrical concrete crushed • Tests conducted after 7, 14, 28 and 51 days • Pressure calculated in pounds per square inch
• Maturity Meters • Winter conditions concrete does not cure as quickly • Confirm concrete strength prior to pulling formwork
Types of Concrete
Pricing in cubic yard (CY) or square feet (SF)
On Site Concrete Testing (1)
Regular Strength
High Strength
Low Strength
Between 1480 psi and 6000 psi
Greater than 6000 psi
Less than 1480 psi
• Strength of concrete on site using a rebound hammer: ▫ Schmidt hammer ▫ Swiss hammer • Hammer measures the rebound of a spring loaded mass impact • Determine compressive strength
Purpose: - Structural Beams and Columns - Foundations -Bridge piers - Roads and Highways
Purpose: - Rarely used in construction - Floor slabs -Flow-able Fill - Back fill
Purpose:
- High Early -Dams - Marine Foundations - Parking Garages
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