Design and Control of Concrete Mixtures 16th Edition Flashcards
What is the minimum thickness of a control joint placed in a 6-inch-thick concrete slab on ground?
1 ½ inches
Formula: 1/4th of the depth of the slab.
Concrete will continue to strengthen with age over time as long as the relative humidity of concrete remains above:
80
Design and Control of Concrete Mixtures Page 274
What type of Portland cement should be used in a massive concrete placement such as a gravity dam (Low heat hydration)?
Type IV
Design and Control of Concrete Mixtures Page 110
What type of Portland Cement should be used in a concrete mix when the forms must be removed early?
Type III
Design and Control of Concrete Mixtures Page 110
What is the effect of algae in mixing water used for concrete?
Reduced strength
Design and Control of Concrete Mixtures Page 179
What type of concrete joint is used for both horizontal and vertical movement at adjoining concrete surfaces?
Isolation joint
Design and Control of Concrete Mixtures Page 437
What is the effect of high heat in concrete?
Reduced slump
Design and Control of Concrete Mixtures Page 467
The abrasion resistance of concrete is dependent upon:
Adequate curing
Design and Control of Concrete Mixtures Page 542
What is the minimum density for lightweight insulating concrete in pounds per cubic foot?
15
Design and Control of Concrete Mixtures Page 554
Concrete cover is the minimum distance from the:
Outside of the reinforcing bar to face of concrete
Design and Control of Concrete Mixtures – Older Edition
What is the finish calculation for figuring the cubic yards of concrete if the beginning calculation is Length x?
Width x Depth (in feet) divided by 27
Design and Control of Concrete Mixtures Calculation
What type of concrete has a low heat of hydration?
Type IV
Design and Control of Concrete Mixtures Page 110
What type of concrete has a moderate sulfate resistance?
Type II
Design and Control of Concrete Mixtures Page 110
What is the maximum slump for lightweight concrete?
5 inches
6 inches Design and Control of Concrete Mixtures Page 553
Why should you use a chute for placing concrete instead of dropping it in place?
Helps concrete to not separate (without segregation)
Design and Control of Concrete Mixtures Page 404
Which admixture is added in concrete to accelerate the rate of hydration and increase strength development at an early age?
Accelerating admixture
Design and Control of Concrete Mixtures Page 222
On concrete thickness up to about seven inches, which of the below are true about air content to slump?
Air content increases as slump increases
Design and Control of Concrete Mixtures Page 269
Which of the below would increase the abrasive strength of concrete?
Low water-cement ratio
Steel - troweled surface
Harder aggregate
All of these
Design and Control of Concrete Mixtures Page 283
What is the purpose of using vibrators when doing concrete work?
Get rid of air voids
Consolidates the concrete
Both 1 and 2
Design and Control of Concrete Mixtures Page 423
Tools used for finishing air-entrained concrete should be constructed from which of the below?
Aluminum or magnesium
Design and Control of Concrete Mixtures Page 429
Normal weight and lightweight concrete exposed to freezing and thawing or deicing chemicals shall be:
Air entrained
Design and Control of Concrete Mixtures Page 359
Hotter than normal temperatures when pouring concrete has what consequences (or “What is true” about pouring concrete in hot weather?)
Increased slump loss
Increased tendency for cracking
Long term strength loss
All of the above
Design and Control of Concrete Mixtures Page 467
Freezing temperatures have what effect (or it may have asked what is true) on fresh concrete
Concrete that has been frozen will not be as impermeable as concrete that wasn’t frozen
Design and Control of Concrete Mixtures Page 482
