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Terms in this set (15)
Best slump for light weight concrete with air?
2" to 4"
What may be the best alternative method if greater temperature reduction is required to lower concrete temperature?
The injection of liquid nitrogen into the mixer
What is the ideal temperature for concrete that is most desirable to maximize beneficial concrete properties?
10°C to 15°C (50°F to 60°F)
Brooming or tining should be performed before the concrete has thoroughly hardened. Tining of pavements improves _______,
Tire traction and reduces Hydro planning
Between what temperatures should care be taken into account to limit surface temperatures to avoid inconsistent setting, rapid moisture loss, and plastic shrinkage cracking?
Between no more than 5°C (10°F) greater or 8°C (15°F) less than that of the concrete
When power-troweling in a systematic pattern, it is important that concrete setting properties remain consistent. What should be avoided during the finish?
Water spraying the surface
Methods for measuring slump
The slump test, Standard Test Method for Slump of Hydraulic-Cement Concrete
What is the absorption rate for recycled-concrete aggregates?
Range from 3% to 10%
When ice is used, in what form should the ice be in by the time mixing is completed and the concrete is discharged?
The ice must be completely melted
What is the default minimum mixing time?
1 minute + 15 seconds/cubic meter (yard)
Addition of the admixtures should be completed no later than _______.
1 minute after addition of water to the cement or prior to the start of the last 3/4ths of the mixing cycle, whichever occurs first
Depositing concrete should be done continuously to avoid?
What is used to measure the consistency of concrete?
What occurs to concrete as a result of hot weather or high temperatures?
There is a loss in slump
For the wires, what does W1.5xW1.5 mean?
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Principles and Practices
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