Review Quiz for Exam#2

Following is NOT a mechanical operation used for finishing concrete: A. screeding B. floating C. fogging D. troweling

C. fogging

Which of the following is a curing method that prevents loss of water from the concrete by sealing the surface? A. electrically heated pads B. saturated wet coverings C. membrane-forming curing compounds D. ponding E. both b and d

C. membrane-forming curing compounds

Which of the following is a method to maintain the presence of water in the concrete during the early hardening period? A. screed the concrete immediately B. use retarders C. use ponding D. use superplasticizers

C. use ponding

What is segregation of concrete? A. Coarse aggregate separating out or settling down from the rest of the mix B. Paste separating away from coarse aggregate C. Water separating out from the rest of the material being a material of lowest specific gravity D. All of the above

D. All of the above

Modern dry process cement plants use a heat recovery cycle to preheat the ground material, or feed stock, with the exhaust gas from the kiln for improving the energy efficiency of cement production. True False

True

Roller compacted concrete is no slump concrete. A. True B. False

A. True

Spraying or fogging requires large amount of water for curing concrete. A. True B. False

A. True

For a project approximately 200 cubic yard concrete mix is needed. Which method is most suitable for producing concrete mix? A. Use concrete produced in a ready mix plant and delivered in an agitator truck B. Use partially mixed concrete in plant and transported in a mixer truck C. Use concrete completely mixed in a mobile plant D. All of the above

A. Use concrete produced in a ready mix plant and delivered in an agitator truck

For better control on proportions of different ingredients of concrete, batching by volume is preferred over batching by weight. A. True B. False

B. False

Ponding is suitable for curing all types of concrete structures. A. True B. False

B. False

Screed poles and chairs are needed to place concrete using laser screed. A. True B. False

B. False

Strength of concrete cured in air is more than strength of concrete cured in water? A. True B. False

B. False

Self-consolidating concrete is measured for slump by: A. Measuring vertical deformation of cone B. Measuring spread on a mat C. Measuring time to flow through cone D. None of the above

B. Measuring spread on a mat

A tremie chute can be used for limiting drop height of concrete which can reduce problem of segregation. A. True B. False

A. True

Floating is to level and fill voids left by screeding and closes the surface. A. True B. False

A. True

In order to evaluate the suitability of nonpotable water available at the job site for mixing concrete, six standard mortar cubes were made using that water and six others using potable water. The cubes were tested for compressive strength after 7 days of curing and produced the following loads to failure (in pounds). Based on results, would you accept nonpotable water for mixing concrete according to ASTM C 94? A. Acceptable B. Not Acceptable C. Needs additional information

A. Acceptable

Which of the following materials make up the majority of the weight of any asphalt concrete mix? A.Aggregates B.Mineral admixtures. C.asphalt cement D.it depends on the mix design

A.Aggregates

Which admixture will help prevent concrete from breaking up due to freeze-thaw conditions? A.Air Entrainment B.Slag C.Calcium chloride D.Fly Ash

A.Air Entrainment

Which of the following is a blended or pozzolan cement? A.blast-furnace slag cement B.air entrained cement C.white portland cement D.Type II cement

A.blast-furnace slag cement

Which of the following admixtures is commonly used to reduce the amount of cement used and the cost of the concrete? A.fly ash B.silica fume C.calcium chloride D.gypsum

A.fly ash

What is the compressive strength of high strength concrete? A. > 5,000 psi B. > 10,000 psi C. > 15,000 psi D. > 20,000 psi

B. > 10,000 psi

Which of the following methods is suitable for transporting concrete to higher heights of a tall building? A. Wheel barrow B. Bucket tied by crane C. Pour directly using conveyor belt D. Buggy

B. Bucket tied by crane

Which type of concrete is an excellent choice for draining water in a parking lot? A. shotcrete B. pervious concrete C. flowable fill D. polymer concrete

B. pervious concrete

A concrete beam 20.5 in (length) x 6 in (breadth) x 6 in (depth) was loaded until failure in a Universal Testing Machine. This beam failed at a load of 13,000 lb when tested with a span of 12 inches. Calculate the modulus of rupture (or flexural strength) of beam. Note: MOR = 1.5XPX L/(b*d2) where P is failure load, L is length of span, b is breadth and d is depth of beam. A.912 psi B.1083 psi C.1210 psi D.1343 psi

B.1083 psi

How many tons of asphalt concrete will be required to overlay a 3-mile-long, 12-ft-wide road with 2.5 inch of wearing course asphalt concrete that has a density of 146.3 pcf? (Note: 1 mile = 5280 ft and 1 ton = 2000 lbs) A.1857 tons B.2897 tons C.4867 tons D.5897 tons

B.2897 tons

A splitting tensile test was conducted on a standard 6 x 12-in. cylinder; the cylinder fractured at 49,800 lb. Calculate the splitting tensile strength of concrete cylinder. Note: Tensile Strength, T = 2P/(π*H*D) where P is failure load, H and D are height and diameter of cylinder, respectively. A.312 psi B.441 psi C.520 psi D.611 psi

B.441 psi

For constructing 72 foot by 10 foot section of driveway which is 4 inches thick, how much concrete (in cubic yards) is needed for pouring? (1 cubic yard = 27 ft3) A.240 B.8.9 C.26.7 D.15.6

B.8.9

What is the weight range of light weight concrete? A.55 - 85 lb/ft3 B.85 - 115 lb/ft3 C.125 - 155 lb/ft3 D.165 - 195 lb/ft3

B.85 - 115 lb/ft3

What is the benefit of cutback asphalt and emulsion over asphalt cement? A.Economical B.Applied at lower temperature C.Provides more strength D.None of the above

B.Applied at lower temperature

Following pavement is classified as full-depth pavement: A.Asphalt mix surface with regular aggregate base B.Asphalt mix surface with asphalt-aggregate mix base C.Asphalt mix surface with cement concrete base D.None of the above

B.Asphalt mix surface with asphalt-aggregate mix base

Setting of cement is defined as A.Gaining strength B.Change from plastic/workable to solid state C.Hydration of cement D.None of the above

B.Change from plastic/workable to solid state

Which asphalt product (emulsion or cutback) is more environmental-friendly? A.Asphalt cement B.Emulsion C.Cutback asphalt D.All of the above

B.Emulsion

What is the correct order of operations involved in conventional Portland cement concrete? A.Batching à Mix design à Mixing/Transporting à Placing à Finishing à Curing B.Mix design à Batching à Mixing/Transporting à Placing à Finishing à Curing C.Mix design à Mixing/Transporting à Batching à Placing à Finishing à Curing D.Batching à Mixing/Transporting à Mix design à Placing à Finishing à Curing

B.Mix design à Batching à Mixing/Transporting à Placing à Finishing à Curing

If concrete is poured in very hot weather, following ingredient is added in the concrete A.More water B.Retarding admixture C.Water reducer D.Air entrainer

B.Retarding admixture

Assume you are a materials engineer and you have to design high-strength concrete (compressive strength > 10,000 psi). Which of the following additive or supplementary cementitious material you would like to add in concrete for achieving high strength? A.Liquid Air B.Silica Fume C.Slag D.Cement Kiln Dust

B.Silica Fume

What is the correct sequence of pavement compaction? A.Pneumatic tired rolling à Nonvibratory steel wheeled rolling à Steel wheeled vibratory rolling B.Steel wheeled vibratory rolling à Pneumatic tired rolling à Nonvibratory steel wheeled rolling C.Nonvibratory steel wheeled rolling à Pneumatic tired rolling à Steel wheeled vibratory rolling D.Steel wheeled vibratory rolling à Nonvibratory steel wheeled rolling à Pneumatic tired rolling

B.Steel wheeled vibratory rolling à Pneumatic tired rolling à Nonvibratory steel wheeled rolling

How compaction density of asphalt is monitored during construction? A.Collecting samples and testing in lab B.Using nuclear density gauge C.Using infrared camera D.None of the above

B.Using nuclear density gauge

Tests used for determining setting time of cement are: A.Compressive strength test B.Vicat and Gillmore test C.Slump and Workability test D.Pressure and Chace Air Indicator test

B.Vicat and Gillmore test

Type III portland cement is similar to Type I cement only the cement is ground much finer. Greater cement fineness is most closely related to: A.increased water tightness B.high-early strength C.slower hydration D.improved air entrainment

B.high-early strength

Why brooming of a freshly prepared concrete pavement surface is important? A. Improves strength B. Improves durability C. Improves slip-resistant D. Improves appearance

C. Improves slip-resistant

Which one of the following is NOT a good candidate for whitetopping? A. Cracked parking lot B. Old cracked pavement C. Old concrete floor of an indoor garage D. None of the above

C. Old concrete floor of an indoor garage

The concrete was ordered from the nearest ready-mix concrete plant. For producing concrete of unit weight of 149.2 lb/ft3, batch weights used in ready-mix concrete plant are shown in Table. How much is yield in cubic yards? (circle one) (1 cubic yard = 27 ft3) A.9 B.10 C.11 D.12

C.11

Portland cement clinker is made by heating, in a kiln, a homogeneous mixture of raw materials to a temperature of A.500 - 1000oC B.1000 - 1250oC C.1400 - 1650oC D.None of the above

C.1400 - 1650oC

Determine the compressive strengths of a 6-in. diameter concrete cylinder that failed at a test load of 150,000 lb. Note: Compressive strength = Failure load/Area A.3200 psi B.4500 psi C.5305 psi D.6100 psi

C.5305 psi

You perform a standard Penetration Test at 77oF (25oC) on a sample of asphalt cement submitted to your laboratory for Penetration grading. The needle penetrates the sample 9.2 mm. (a) What is the penetration value of the asphalt in "penetration units"? A.0.92 B.9.2 C.92 D.920

C.92

Fine aggregates (sand) are: A.Aggregates coarser than 4.75 mm (#4 sieve)B. B.Aggregates finer than 0.075 mm (#200 sieve) C.Aggregates finer than 4.75 mm (#4 sieve) D.none of the above

C.Aggregates finer than 4.75 mm (#4 sieve)

Which of the following asphalt mixes is most suitable for patching potholes on less-trafficked roads A.Hot mix asphalt B.Warm mix asphalt C.Cold mix asphalt D.All of the above

C.Cold mix asphalt

Which of the following admixtures is used for stopping and reactivating hydration process of concrete? A.Retarder B.Water reducer C.Hydration controller D.Accelerator

C.Hydration controller

Which of the followings is not one of the constituents of conventional asphalt (i.e., asphalt cement)? A.Asphaltenes B.Resins C.Polymer D.Oils

C.Polymer

Asphalt is following type of material: A.Elastic B.Viscous C.Viscoelastic D.Plastic

C.Viscoelastic

Which aggregate could be used for structural lightweight concrete? A.crushed stone B.magnetite C.expanded shale D.limestone

C.expanded shale

Gypsum is added to the cement to: A.decrease the weight of the concrete B.improve the tensile strength of the concrete C.regulate the setting time D.reduce the amount of water needed

C.regulate the setting time

Aggregates are NOT used in the construction of following pavement layer A.base layer B.surface layer (asphalt concrete) C.subgrade layer D.cement concrete layer

C.subgrade layer

Concrete continues to increase in strength as long as: A. any unhydrated cement is present B. the concrete temperature remains favorable C. the concrete remains moist or has a relative humidity above approximately 80% D. all of the above

D. all of the above

The chemical process by which concrete cures and hardens is known as: A. Tempering B. polymerization C. annealing D. hydration

D. hydration

What is the weight of heavy weight concrete? A.150 lb/ft3 B.250 lb/ft3 C.300 lb/ft3 D.400 lb/ft3

D.400 lb/ft3

If concrete is poured in very cold climate, following ingredient is added in the concrete for making it durable A.More water B.Retarding admixture C.Water reducer D.Air entrainer

D.Air entrainer

Which of the following asphalt binders will be more resistant to rutting and cracking for wider variation of temperatures? A.PG 64-22 B.PG 70-28 C.PG 58-22 D.PG 70-34

D.PG 70-34

The type of cement typically used in the massive structures such as dams is: A.Type I B.Type II C.Type III D.Type IV

D.Type IV

The chemical process by which concrete cures and hardens is known as: A.Tempering B.polymerization C.annealing D.hydration

D.hydration

As an inspector on road construction project, what is important to record during the delivery of asphalt mix truck? A.Make sure truck is not overloaded B.Time mix received C.Location at which mix was placed D.Temperature of mix E. All of the above

E. All of the above

A tack coat is a thin layer of emulsion or cutback asphalt applied between hot mix asphalt pavement lifts which act as a glue (or promote bonding) between lifts. True False

True

Air void is important in asphalt mixes to accommodate viscosity changes of binder under load and temperature. True False

True

Asphalt cement is pure asphalt and asphalt binder includes both neat asphalt cement and modified asphalt cement made by adding polymers for improving properties of asphalt. True False

True

Asphalt mix is considerably different than other materials such as cement concrete as its properties are very sensitive to temperature, rate of loading and aging. True False

True

Excess water in concrete improves workability but decreases durability and strength. True False

True