Concrete Quiz #3 
• Type G
Water reducing, high-range and retarding admixture
. Using the strength design method, design strength must be required strength a. Less than or equal to b. Equal to c. Greater than or equal to d. The opposite of
c. Greater than or equal to
• Type C
Accelerating admixtures
21. Which of the following factors influence development strength? I - Rebar spacing II- concrete weight III- concrete cover IV- heat of hydration V- rebar coating A. All of the above B. II, III, and IV only C. I, II, III, and V only D. None of the above
C. I, II, III, and V only
21. The procedure for final acceptance of the project must be clearly defined in the . the owner must be prepared to adhere to all aspects of the acceptance procedures including inspection, acceptance, and final payment. a. Contract
Contract
• Type B
Retarding admixtures
• Type III
high early strength
How are aggregate moisture performed and documented is part of? Select all that apply. a. Concrete batch plant evaluation b. Concrete structure design c. Government agency inspection d. Cost estimate for construction
a. Concrete batch plant evaluation
11. In reinforced concrete design, load types that have a higher uncertainty receive a. Higher load factors b. Higher resistance factors c. A load factor of 0.9 d. A resistance factor of 0.75
a. Higher load factors
19. What effect does the addition of a truss passing over the top of a concrete column, as shown below, have on the k-value (effective length factor) of the column? a. It causes the k-value to increase, significantly, reducing the buckling capacity. b. It has no effect on either the k-value or bulking capacity
a. It causes the k-value to increase, significantly, reducing the buckling capacity.
Beam A-B is subject to what force a. Moment about the Z-axis torsion about the x-axis and shear along the y only b. Torsion about the x-axis and shear along the y-axis only c. Tension along the x-axis and shear along the y-axis only
a. Moment about the Z-axis torsion about the x-axis and shear along the y only
22. Which of the plyform orientations provides the strongest formwork system? a. Parallel to the span b. Parallel to the studs c. Perpendicular to the span d. Perpendicular to the wales
a. Parallel to the span
15. Which of the following benefits are attributed to the use of retarding admixtures? Select all that apply. a. Permits greater flexibility in extending the time of set and the prevention of cold joints b. Highly flowable, nearly self-leveling concrete c. Improved protection against early exposure to freezing and thawing d. Facilities finishing in hot water
a. Permits greater flexibility in extending the time of set and the prevention of cold joints & d. Facilities finishing in hot water
10. Air-entraining admixtures are:? Select all that apply. a. Primarily used to stabilize tiny air bubbles in concrete b. Increase early compressive strength gain c. Protect against damage from repeated freezing and thawing cycles d. Produced by mixing
a. Primarily used to stabilize tiny air bubbles in concrete
13. The engineering design team is usually led by the: a. Project manager b. Office manager c. Assistant manager
a. Project manager
23. Are the critical elements for a successful project regarding clearly delineated and efficient office procedures for the administration of design, document control, checking of shop or placing drawings, and processing design changes. a. Quality assurance and quality control b. Payment terms c. Regulatory compliance
a. Quality assurance and quality control
6. "For all linear systems, the net response at a given place and time caused by two or more stimuli is the sum of the response which would have been caused by each stimulus individually" is the: a. Superposition principle b. Second moment of area principle c. Stress- strain principle d. Strength design method
a. Superposition principle
11. Engineers apply factors to selected load cases to create Load Combination used for design: a. True b. False
a. True
12. The higher of ambient temperature is, the shorter setting time will be. a. True b. False
a. True
13. Air-entraining admixtures are primarily used to stabilize tiny air-bubbles in concrete. a. True b. False
a. True
13. As concrete hardens, lateral pressure on the form decreases a. True b. False
a. True
18. Expansion joints are used at points of restraint, including the junction between the elements of a structure. For example, they separate walls or columns from floors. a. True b. False
a. True
2. For optimal time effectiveness, high range water reducers and accelerators are often introduced at the jobsite. a. True b. False
a. True
20. Typically, the design professional should review and approve the concrete mixture proportions (mix design) and submittals concerning materials, procedures, and testing data. a. True b. False
a. True
12. Flexural strain at the neutral axis of a beam is a. Zero b. One c. Infinity d. Undefined
a. Zero
5. For a body at rest, the sum of the forces acting on the body in any one direction is equal to:
a. Zero
24. Prebid and preconstruction conferences should be held to identify a. Lines of communication b. Responsibility c. Discuss the contract requirements
all of the above
19. Given the following design conditions for a wall form system: Concrete mix = type II cement without retarder Concrete unit weight (w) = 150 pcf Wall height (h) = 10 ft. high Rate of Pour (R) = 6 ft. per hour Concrete Temperature (T) = 70 degree Fahrenheit Wall thickness = 15 inches What is the maximum design pressure on the wall in pounds per square foot (psf)? < 7 ℎ : 234 = 7 8[150 + 9,000 ∗ ] a) 771 b) 921 c) 1010 d) 1436
b) 921
17. Based on the data presented in this class, what is the typical percentage of total work hours expended for reinforced concrete work in a grass roots heavy industrial project? a. 4% b. 14% c. 40%
b. 14%
25. Which subject category in the level I (AC) examination are weight about 14%: a. Engineering concepts and construction geomatics b. Bidding estimating and planning, scheduling, and schedule control c. Construction safety and project administration
b. Bidding estimating and planning, scheduling, and schedule control
11. Long term compressive strength of concrete using Type III Portland cement is higher than with Type I Portland cement (general purpose). a. True b. False
b. False
16. A simply supported beam as shown below figure 1.1, loaded with a uniform load, w, and the max moment is given as wl^2/8. If the supports are changed to moment fixed supports, the moments will be shown below figure 1.1: a. True b. False
b. False
16. Contraction joints are where concrete placement stop and start a. True b. False
b. False
16. The engineer of record develops the proposed mix designs based on the project specifications. a. True b. False
b. False
19. Typically review and approval of detailed formwork design is the responsibility of the design professional a. True b. False
b. False
20. Aluminum conduit and sleeves are not harmful to concrete may be embedded in concrete a. True b. False
b. False
22. After award of the contract, the Constructor and any specialty contractors should meet with the owner to review design requirements and criteria for the show drawings, samples, or submittals. a. True b. False
b. False
5. One advantage of spread footings is that they are not susceptible to settlement problems a. True b. False
b. False
6. Foundations for vertical vessels and towers are usually circular in shape since that is the easiest shape to form. a. True b. False
b. False
7. All deep foundations are referred to as "piles" a. True b. False
b. False
17. Which party is responsible for the design of the concrete formwork? a. Owner b. Field engineer c. Concrete supplier d. Architect/engineer
b. Field engineer
10. Which of the following is not a load case used by engineers in foundation design? a. Dead load b. Flexible load c. Wind load
b. Flexible load
3. A moment is designated by a double headed arrow and has units of: a. Force dived by length b. Force times length c. Force dived by time d. Length times force divided by time
b. Force times length
20. Adding bracing to a frame does what to the buckling capacity of the columns? a. Nothing b. Increases c. Decreases d. None of the above
b. Increases
1. Without any special measures taken, is it okay to set epoxy grout below freezing temperature? a. Yes b. No
b. No
. Increasing the depth of a beam contribute significantly stress and deflection. a. Reducing, increasing b. Reducing, limiting c. Increasing / limiting d. Increasing / increasing
b. Reducing, limiting
4. All foundations may be classified as one or two types a. Shallow and rigid b. Shallow and deep c. Shallow and flexible d. Field -fabricated and pre-fabricated
b. Shallow and deep
17. When designing a concrete beam, if the rebar yields (strain >= 0.005) the section is said to be: a. Compression controlled b. Tension controlled c. Transition phase d. Buckling
b. Tension controlled
3. In accordance with ASTM C 172 samples for acceptance testing should be taken at what portion of the batch? a. Immediately before discharging the concrete b. The middle of batch c. The end of batch
b. The middle of batch
12. Which of the below variable has the greatest impact when calculating wind loads? a. Wind direction b. Wind speed c. Shape of the object being loaded by wind d. Wind temperature
b. Wind speed
14. What minimum percentage of water reduction must be obtained for an admixture to be classified as a Type A (water-reducing) admixtures? a. 2% b. 3% c. 5% d. 7%
c. 5%
18. Based on last week's class note, what kind of reinforced concrete elements are we talking about. a. Columns and beams b. Foundations and area paving c. All of the above
c. All of the above
9. Which deep foundation type is not suitable for installation in wet and or loose soil? a. Driven piles au b. Auger cast piles c. Drilled piles
c. Drilled piles
• Type V
high sulfate resistance
1. When installing concrete in extreme weather conditions, different techniques are used to help mitigate the effect of temperature. Which of the following are typical cold weather concrete techniques? Select all that apply. a. Fly ash substitute b. Retarding admixture c. Leave forms in place d. Place concrete at night or early morning
c. Leave forms in place
8. The deflection of a beam is inversely proportional to the: a. Length of beam b. Load on the beam c. Second moment of area (1) of the cross section d. Tensile strength of the beam material
c. Second moment of area (1) of the cross section
• Type II
cement used where moderate sulfate resistance
21. Assume that you have concrete that weighs 150 pounds per cubic foot and the concrete slab is 10 inches thick. What is the total dead load for the slab in pounds per square foot? = 1012 .. ∗ 150 . H a. 12.5 b. 50.0 c. 75.0 d. 125.0
d. 125.0
18. Define Torsion: a. Excess tension b. Bending about a transverse axis c. A sudden failure of compressive member that is subject to loads that are less than its ultimate compressive strength d. Bending about a longitudinal axis
d. Bending about a longitudinal axis
14. Which one is not included in three types of joints used in concrete slabs and walls: a. Contraction joints b. Expansion joints c. Pour joints d. Disk joints
d. Disk joints
4. A pictorial device to analyze the force and moment acting on a body" is a a. Stress-strain diagram b. Superposition principle c. Shear moment diagram d. Free- body diagram
d. Free- body diagram
15. As part of jobsite preparation, before concrete is poured, it is important to be aware of any potential increased pressure on the forms. Which of the following factors increase pressure on forms? a. Increase temperature b. Material of the form c. Lower slump d. Increase in lift heights
d. Increase in lift heights
2. The slope of the linear portion of the stress-strain curve is called a. Strain hardening region b. Modulus of rupture c. Moment diagram d. Modulus of elasticity
d. Modulus of elasticity
. Strain is defined as (new length - original length) / ( ) a. New length b. Change in length c. Width d. Original length
d. Original length
8. Which of the following deep foundations types will require a specialty contractor for installation? a. Driven piles b. Auger cast piles c. Drilled piles d. A and c e. A and b f. All of the above
e. A and b
• Type I:
general purpose
• Type IV
low heat of hydration
• Type A
water reducing
• Type E
water reducing and accelerating admixture
• Type D
water reducing and retarding admixture
• Type F
water reducing, high range, admixture
