COSC 354 Exam 2 (chapters 13, 14, 11) Questions Answered Correctly Latest Update 2025-
2026
typ. concrete make up - Answers - 60-80% aggregate
- 10-15% cement
- 20% water
- remainder is air
coarse aggregates - Answers - comes from erosion
- 5/8" - 1.5"
Fine aggregates - Answers - Natural sand
- byproduct of mining
- pass through 3/8" sieve
- about 75% of volume of concrete
well graded - Answers assortment of fine, medium and large grains
clinker - Answers mix of the raw materials that make up portland cement
types of portland cement - Answers "A" means air entraining
1 (basic)
2 (moderate resistance to sulfate attack)
3(high early strength)
4 (low heat of hydration)
5 (high resistance to sulfate attack)
SCM - Answers supplementary cementitious materials
pozzolans or hydraulic cements - Answers - can reduce cost
- reduce greenhouse gasses in production
- pozzolans used to increase workability
fly ash - Answers - improves workability, strength, durability
, - byproduct of coal fired power plants
slag - Answers - reduces environmental footprint
- byproduct of welding
silica fume - Answers -increases strength and reduces permeability; is a waste product of semi-
conductor manufacture
clays and shales - Answers - impermeability and chemical durability
- resistance to thermal cracking
slump test - Answers - measures the consistency of concrete
- confirm degree of workability
- true (4-6")
- zero (too dry)
- collapsed (too wet)
- shear (lack of cohesion)
slump flow test - Answers - high workability mix (self consolidating SSC)
- assess horizontal free flow
- slump cone filled and lifted
- 18-32" around
Self consolidating concrete SSC - Answers - no mechanical consolidation
- used in tight spaces with a lot of rebar
- high finish quality (no big aggregates)
Test cylinders - Answers - 3 day break (early break)
- 7 day break (75% strength)
- 14 day
- 28 day (100% design strength)
rebar - Answers - used as tension device in concrete
- multiply size by 1/8" (#5=5/8")
2026
typ. concrete make up - Answers - 60-80% aggregate
- 10-15% cement
- 20% water
- remainder is air
coarse aggregates - Answers - comes from erosion
- 5/8" - 1.5"
Fine aggregates - Answers - Natural sand
- byproduct of mining
- pass through 3/8" sieve
- about 75% of volume of concrete
well graded - Answers assortment of fine, medium and large grains
clinker - Answers mix of the raw materials that make up portland cement
types of portland cement - Answers "A" means air entraining
1 (basic)
2 (moderate resistance to sulfate attack)
3(high early strength)
4 (low heat of hydration)
5 (high resistance to sulfate attack)
SCM - Answers supplementary cementitious materials
pozzolans or hydraulic cements - Answers - can reduce cost
- reduce greenhouse gasses in production
- pozzolans used to increase workability
fly ash - Answers - improves workability, strength, durability
, - byproduct of coal fired power plants
slag - Answers - reduces environmental footprint
- byproduct of welding
silica fume - Answers -increases strength and reduces permeability; is a waste product of semi-
conductor manufacture
clays and shales - Answers - impermeability and chemical durability
- resistance to thermal cracking
slump test - Answers - measures the consistency of concrete
- confirm degree of workability
- true (4-6")
- zero (too dry)
- collapsed (too wet)
- shear (lack of cohesion)
slump flow test - Answers - high workability mix (self consolidating SSC)
- assess horizontal free flow
- slump cone filled and lifted
- 18-32" around
Self consolidating concrete SSC - Answers - no mechanical consolidation
- used in tight spaces with a lot of rebar
- high finish quality (no big aggregates)
Test cylinders - Answers - 3 day break (early break)
- 7 day break (75% strength)
- 14 day
- 28 day (100% design strength)
rebar - Answers - used as tension device in concrete
- multiply size by 1/8" (#5=5/8")
