Reinforced Concrete Design Flashcards
What is the mode of failure for short columns at which the concrete reaches its limit strain Eu ay precisely the same instant that the tensile steel on the far side of the column reaches yield strain Ey?
a. Under-reinforced design
b. Over-reinforced design
c. Balanced Condition
c. Balanced Condition
What is the max’s Vs (shear carried by the stirrups)?
a. 1/3√f’c
b. 2/5√f’c
c. 2/3√f’c
d. √f’c
c. 2/3√f’c
What is the distance from the extreme fiber in compression to the centroid of the tension steel area?
a. Tension Depth
b. Extreme Distance
c. Effective Depth
d. Centroid Distance
c. Effective Depth
The maximum useable strain at the extreme concrete compression of fiber shall be assumed to be equal to ___.
a. 0.003
b. 0.002
c. 0.001
d. 0.004
a. 0.003
A buried plate, wall or block attached to some distance from and forming an anchorage for retaining wall.
a. deadman
b. pile
c. curb
d. anchor plate
a. deadman
It is a beam especially provided over an opening door, window, etc. to carry the wall over the opening.
a. Girder
b. Lintel Beam
c. Girt
d. Parapeet
b. Lintel Beam
What will happen to the concrete strength if water-to-cement ratio decreases?
a. Concrete strength increases, porosity decreases, soli-to-space ratio increases
b. Concrete strength increases, porosity decreases, soli-to-space ratio decreases
c. Concrete strength decreases, porosity increases, soli-to-space ratio increases
d. Concrete strength decreases, porosity increases, soli-to-space ratio decreases
a. Concrete strength increases, porosity decreases, soli-to-space ratio increases
What is the property of concrete by which it continues to deform with time under sustained loads at unit stresses within acceptable elastic range?
a. Shrinkage
b. Creep
c. Elasticity
d. Rigidity
b. Creep
Honeycomb structures exhibits
I. small arches with drain particles
II. has a void ratio of 0.91 for a simple cubic packing
III. has a void ratio of 0.35 for pyramidal packing
IV. Negative relative densities
a. I, II, III only
b. I, III only
c. all of the above
d. I, IV only
d. None of the above
d. None of the above
What is the condition where the tension steel strain reaches the yielding strain simultaneously with the concrete reaching the crushing strain which is usually 0.003?
a. under-reinforced
b. over-reinforced
c. simply-reinforced
d. balanced strain
d. balanced strain
What is a material that has adhesive and cohesive properties enabling it to bound mineral fragments into a solid mass in the presence of water?
a. adhesives
b. hydraulic cement
c. aggregates
d. admixtures
b. hydraulic cement
What materials have adhesives and cohesive properties necessary to bond inert aggregates into a solid mass of adequate strength and durability?
a. Admixtures
b. Adhering Materials
c. Inorganic Materials
d. Cementitious Materials
e. None of the Above
d. Cementitious Materials
What is generated when compounds in cement react with water to acquire stable low-energy states?
a. Heat of Hydration
b. acid fumes
c. Carbon Dioxide
d. Oxygen Compound
a. Heat of Hydration
What compounds reduce the interparticle forces that exist between cement grains in the fresh paste; thereby increasing the paste fluidity?
a. Admixtures
b. Plasticisers
c. Bitumens
d. Asphalts
e. None of the above
b. Plasticisers
In mixes exposed to water, what is the term used to refer to the separation of aggregate from the bitumen due to the faster adsorption of water on the aggregate surface?
a. Bleeding
b. curing
c. slippage
d. workability
c. slippage
A parameter used for estimating strength of concrete.
a. air entrainment
b. water-cement ratio
c. bleeding
d. segregation
e. none of the above
b. water-cement ratio
It is the property of fresh concrete which is the ability to flow under momentum transfer or under mechanical stress?
a. air entrainment
b. stability
c. mobility
d. placeability
c. mobility
True or False: As water to cement ratio increases, there is progressive weakening due to increase in porosity.
a. True
b. False
a. True
It is a temporary dam-like structure constructed around an excavation to exclude water.
a. cofferdam
b. earth dam
c. excavation wall
d. retaining wall
a. cofferdam
Which of the following is NOT a property of hardened hydraulic cement concrete?
a. economy
b. durability
c. density
d. workability
d. workability
Which of the following properties of aggregates has the LEAST influence to the quality of concrete?
a. grading or maximum comparative sizes of the particles
b. amounts and kinds of impurities in the aggregates
c. colour, texture and shape of the aggregates
d. durability of the aggregates, or their resistance to fire and exposure to weathering
c. colour, texture and shape of the aggregates
Which of the following will minimise the cracking of pavement due to thermal expansion?
a. compaction of subgrade
b. provide expansion joints and sectional pouring of concrete
c. consistency of concrete mixed
b. provide expansion joints and sectional pouring of concrete
