Construction Materials Exam #2
Questions with Correct Answers
What are the four components of concrete? - ANSWERS1) Cement
2) Water
3) Fine Aggregate
4) Coarse Aggregate
Mortar - ANSWERScement in between bricks in walls
Grout - ANSWERSstuff in between tiles
Supplementary cementitious materials - ANSWERSwhen added to PCC, they have
cementitious characteristics. can reduce PCC by 20% and maintain the same strength.
Honeycombing - ANSWERSwhen you can see the air pockets in concrete, bad
Advantages of Reducing Water Content - ANSWERS1) Increased strength
2) Lower permeability
3) Increased weathering resistance
4) Better concrete bond
5) Reduced drying shrinkage and cracking
6) Less volume change from wetting to drying
Workability - ANSWERSthe property of freshly mixed concrete that determines its
working characteristics (i.e. the ease it can be mixed, placed, compacted and finished.)
Factors Affecting Workability - ANSWERS1) Method and duration of transportation
2) Quantity and characteristics of cementing materials
3) Concrete consistency (slump)
4) Aggregate grading, shape and surface texture
5) % entrained air
6) Water content
7) Concrete and ambient air temperature
8) Admixtures
Hydration - ANSWERSthe chemical reaction between cement and water in which new
compounds with strength producing properties are formed
Heat of Hydration - ANSWERSthe heat given off during the chemical reaction as the
cement hydrates
Questions with Correct Answers
What are the four components of concrete? - ANSWERS1) Cement
2) Water
3) Fine Aggregate
4) Coarse Aggregate
Mortar - ANSWERScement in between bricks in walls
Grout - ANSWERSstuff in between tiles
Supplementary cementitious materials - ANSWERSwhen added to PCC, they have
cementitious characteristics. can reduce PCC by 20% and maintain the same strength.
Honeycombing - ANSWERSwhen you can see the air pockets in concrete, bad
Advantages of Reducing Water Content - ANSWERS1) Increased strength
2) Lower permeability
3) Increased weathering resistance
4) Better concrete bond
5) Reduced drying shrinkage and cracking
6) Less volume change from wetting to drying
Workability - ANSWERSthe property of freshly mixed concrete that determines its
working characteristics (i.e. the ease it can be mixed, placed, compacted and finished.)
Factors Affecting Workability - ANSWERS1) Method and duration of transportation
2) Quantity and characteristics of cementing materials
3) Concrete consistency (slump)
4) Aggregate grading, shape and surface texture
5) % entrained air
6) Water content
7) Concrete and ambient air temperature
8) Admixtures
Hydration - ANSWERSthe chemical reaction between cement and water in which new
compounds with strength producing properties are formed
Heat of Hydration - ANSWERSthe heat given off during the chemical reaction as the
cement hydrates
