Question 1

How is a freeze-thaw test performed and what does it determine?

Accepted Answer

Cured concrete specimens are placed in a...

Question 2

Describe environmental pollution concerns associated with Portland cement and some possible solutions.

Accepted Answer

The manufacturing of Portland cement is ...

Question 3

What do water reducing admixtures do and what are some examples of agents?

Accepted Answer

Water-reducing admixtures lower the amount of water needed to produce concrete of a given consistency. They can also be used to increase the amount of slump without requiring additional water. This makes for a lower water-cement ratio, resulting in greater concrete strength. Some water-reducing admixtures shorten set time and can cause increased drying shrinkage. Lignin solfonic acids and metallic salts are common water-reducing agents.

Question 4

What does a gas-forming agent do when added to concrete?

Accepted Answer

Gas-forming agents are added to concrete...

Question 5

Type ____ Portland cement is used only in concrete that is exposed to severe sulfate conditions.

Accepted Answer

A)   IIA
B)   III
C)   IV
D)   VE) A) and D)
F) C) and D)

Question 6

____ is a measure of the relative density of an aggregate.

Accepted Answer

A)   Specific gravity
B)   Compressive strength
C)   Freeze resistance
D)   Absorption rateE) A) and B)
F) B) and D) A

Question 7

The ____ test is used to ascertain the resistance to wear of hardened concrete samples.

Accepted Answer

A)   freeze-thaw
B)   curring
C)   abrasion
D)   compressive strengthE) A) and C)
F) A) and B) C

Question 8

____ agents are added to concrete or grout to cause a slight expansion in it before it hardens.

Accepted Answer

A)   Gas-forming
B)   Grouting
C)   Hardening
D)   BondingE) A) and B)
F) None of the above

Question 9

Briefly describe how concrete is made and describe its beneficial properties.

Accepted Answer

​ Concrete can be made by simple hand mi...

Question 10

The ____ test is used to determine the water and cement content of fresh concrete.

Accepted Answer

A)   slump
B)   cement content
C)   air-content
D)   unit weightE) A) and C)
F) A) and B)

Question 11

When should entrained air be used and what does it do to concrete?

Accepted Answer

Entrained air should be used in all conc...

Question 12

A(n)  ____ admixture speeds up the strength development of concrete.

Accepted Answer

A)   pozzolan
B)   water reducing
C)   accelerator
D)   retardingE) B) and C)
F) A) and D)

Question 13

____ admixtures are used to entrain microscopic air bubbles in concrete.

Accepted Answer

A)   Retarding
B)   Air-entraining
C)   Water reducing
D)   PozzolanE) A) and B)
F) A) and C)

Question 14

Describe Type II Portand cement.

Accepted Answer

Type II cement is used when protection a...

Question 15

____ is a measure of the amount of water that passes through channels running between the outer faces of the concrete.

Accepted Answer

A)   Bonding ability
B)   Hardening ability
C)   Workability
D)   PermeabilityE) A) and D)
F) B) and C)

Question 16

____ admixtures reduce the amount of water needed to produce concrete of a given consistency.

Accepted Answer

A)   Retarding
B)   Air entraining
C)   Water-reducing
D)   PozzolanE) A) and B)
F) All of the above

Question 17

A ____ test requires that a steel rod with an enlarged end be cast in the concrete.

Accepted Answer

A)   rebound
B)   vibration
C)   penetration
D)   pull-outE) A) and D)
F) B) and D)

Question 18

What does a unit weight test involve and what does it determine?

Accepted Answer

The unit weight test involves weighing a...

Question 19

Describe resistance to abrasion and skidding as it relates to aggregates.

Accepted Answer

Abrasion resistance is important when th...

Question 20

What are heavyweight aggregates, for what purpose are they used, and what are some examples of those frequently used?

Accepted Answer

Heavyweight aggregates are used to produ...

Exam 7: Concrete

How is a freeze-thaw test performed and what does it determine?

Correct Answer
verified
Cured concrete specimens are placed in a...
View Answer

Describe environmental pollution concerns associated with Portland cement and some possible solutions.

Correct Answer
verified
The manufacturing of Portland cement is ...
View Answer

What do water reducing admixtures do and what are some examples of agents?

What does a gas-forming agent do when added to concrete?

Correct Answer
verified
Gas-forming agents are added to concrete...
View Answer

Type ____ Portland cement is used only in concrete that is exposed to severe sulfate conditions.

Correct Answer
verified

____ is a measure of the relative density of an aggregate.

Correct Answer
verified
A

The ____ test is used to ascertain the resistance to wear of hardened concrete samples.

Correct Answer
verified
C

____ agents are added to concrete or grout to cause a slight expansion in it before it hardens.

Correct Answer
verified

Briefly describe how concrete is made and describe its beneficial properties.

Correct Answer
verified
Concrete can be made by simple hand mi...
View Answer

The ____ test is used to determine the water and cement content of fresh concrete.

Correct Answer
verified

When should entrained air be used and what does it do to concrete?

Correct Answer
verified
Entrained air should be used in all conc...
View Answer

A(n) ____ admixture speeds up the strength development of concrete.

Correct Answer
verified

____ admixtures are used to entrain microscopic air bubbles in concrete.

Correct Answer
verified

Describe Type II Portand cement.

Correct Answer
verified
Type II cement is used when protection a...
View Answer

____ is a measure of the amount of water that passes through channels running between the outer faces of the concrete.

Correct Answer
verified

____ admixtures reduce the amount of water needed to produce concrete of a given consistency.

Correct Answer
verified

A ____ test requires that a steel rod with an enlarged end be cast in the concrete.

Correct Answer
verified

What does a unit weight test involve and what does it determine?

Correct Answer
verified
The unit weight test involves weighing a...
View Answer

Describe resistance to abrasion and skidding as it relates to aggregates.

Correct Answer
verified
Abrasion resistance is important when th...
View Answer

What are heavyweight aggregates, for what purpose are they used, and what are some examples of those frequently used?

Correct Answer
verified
Heavyweight aggregates are used to produ...
View Answer

Exam 7: Concrete

How is a freeze-thaw test performed and what does it determine?

Correct AnswerverifiedCured concrete specimens are placed in a...View AnswerShow Answer

Describe environmental pollution concerns associated with Portland cement and some possible solutions.

Correct AnswerverifiedThe manufacturing of Portland cement is ...View AnswerShow Answer

What do water reducing admixtures do and what are some examples of agents?

What does a gas-forming agent do when added to concrete?

Correct AnswerverifiedGas-forming agents are added to concrete...View AnswerShow Answer

Type ____ Portland cement is used only in concrete that is exposed to severe sulfate conditions.

Correct AnswerverifiedShow Answer

____ is a measure of the relative density of an aggregate.

Correct AnswerverifiedA

The ____ test is used to ascertain the resistance to wear of hardened concrete samples.

Correct AnswerverifiedC

____ agents are added to concrete or grout to cause a slight expansion in it before it hardens.

Correct AnswerverifiedShow Answer

Briefly describe how concrete is made and describe its beneficial properties.

Correct Answerverified​ Concrete can be made by simple hand mi...View AnswerShow Answer

The ____ test is used to determine the water and cement content of fresh concrete.

Correct AnswerverifiedShow Answer

When should entrained air be used and what does it do to concrete?

Correct AnswerverifiedEntrained air should be used in all conc...View AnswerShow Answer

A(n) ____ admixture speeds up the strength development of concrete.

Correct AnswerverifiedShow Answer

____ admixtures are used to entrain microscopic air bubbles in concrete.

Correct AnswerverifiedShow Answer

Describe Type II Portand cement.

Correct AnswerverifiedType II cement is used when protection a...View AnswerShow Answer

____ is a measure of the amount of water that passes through channels running between the outer faces of the concrete.

Correct AnswerverifiedShow Answer

____ admixtures reduce the amount of water needed to produce concrete of a given consistency.

Correct AnswerverifiedShow Answer

A ____ test requires that a steel rod with an enlarged end be cast in the concrete.

Correct AnswerverifiedShow Answer

What does a unit weight test involve and what does it determine?

Correct AnswerverifiedThe unit weight test involves weighing a...View AnswerShow Answer

Describe resistance to abrasion and skidding as it relates to aggregates.

Correct AnswerverifiedAbrasion resistance is important when th...View AnswerShow Answer

What are heavyweight aggregates, for what purpose are they used, and what are some examples of those frequently used?

Correct AnswerverifiedHeavyweight aggregates are used to produ...View AnswerShow Answer

Correct Answer
verified
Cured concrete specimens are placed in a...
View Answer

Correct Answer
verified
The manufacturing of Portland cement is ...
View Answer

Correct Answer
verified
Gas-forming agents are added to concrete...
View Answer

Correct Answer
verified

Correct Answer
verified
A

Correct Answer
verified
C

Correct Answer
verified

Correct Answer
verified
Concrete can be made by simple hand mi...
View Answer

Correct Answer
verified

Correct Answer
verified
Entrained air should be used in all conc...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Type II cement is used when protection a...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
The unit weight test involves weighing a...
View Answer

Correct Answer
verified
Abrasion resistance is important when th...
View Answer

Correct Answer
verified
Heavyweight aggregates are used to produ...
View Answer