FINALS LEAK Flashcards
The Normal Consistency of cement is expressed in terms of:
A) Percentage of water by weight
B) Millimeters of penetration of the needle
C) Grams of water per gram of cement
D) No standard unit, It’s a qualitative measure
A) Percentage of water by weight
In the Normal Consistency test, the Vicat apparatus is used to measure:
A) Temperature changes in the cement paste
B) Density of the cement paste
C) Consistency of the cement paste
D) pH of the cement paste
C) Consistency of the cement paste
What factor primarily influences the setting time of cement?
A) Ambient temperature
B) Relative humidity
C) Cement fineness
D) Water-cement ratio
D) Water-cement ratio
The final setting time of cement is the time elapsed between:
A) The beginning of mixing and the point at which the needle fails to penetrate the paste to a specified depth
B) The addition of water to cement and the creation of bleeding in the concrete mixture
C) The creation of bleeding in the concrete mixture and the point at which the needle fails to penetrate the paste.
D) The beginning of hydration and the point at which the paste achieves its maximum compressive strength
A) The beginning of mixing and the point at which the needle fails to penetrate the paste to a specified depth
What is the significance of measuring both the initial and final setting times of cement?
A) To ensure the safety of construction workers
B) To assess the workability of fresh concrete
C) To determine the optimal curing time for concrete
D) To understand the setting characteristics and behavior of cement paste
D) To understand the setting characteristics and behavior of cement paste
During the setting time test, the Vicat apparatus measures the resistance of cement paste to penetration under:
A) Constant temperature
B) Constant pressure
C) Constant humidity
D) Constant volume
A) Constant temperature
B) Constant pressure
What is the effect of moisture on the specific gravity of cement?
A) Moisture decreases the specific gravity of cement.
B) Moisture increases the specific gravity of cement
C) Moisture has no significant effect on the specific gravity of cement
D) The effect of moisture depends on the type of cement
A) Moisture decreases the specific gravity of cement.
During the specific gravity test, the cement sample is typically:
A) Heated to a specific temperature
B) Immersed in water for a specified period
C) Compacted a specified mold
D) Exposed to UV
B) Immersed in water for a specified period
How does the absorption capacity of coarse aggregates affect concrete mixtures?
A) Higher absorption leads to increased workability
B) Lower absorption results in higher concrete strength
C) Absorption affects the water-cement ratio and workability of concrete
D) Absorption has no significant impact on concrete properties
C) Absorption affects the water-cement ratio and workability of concrete
During the moisture content test, the aggregate samples are typically:
A) Immersed in water for a specified period
B) Dried in an oven to remove moisture
C) Compacted into a specified mold
D) Exposed to UV light
B) Dried in an oven to remove moisture
The moisture content of aggregates can be used to estimate their:
A) Compressive strength
B) Flexural strength
C) Water requirement for mixing
D) Particle size distribution
C) Water requirement for mixing
What does the slump test measure in concrete?
A) Compressive strength
B) Workability
C) Setting time
D) Specific gravity
B) Workability
What is the purpose of the slump test in concrete experimentation?
A) To measure the compressive strength of concrete
B) To assess the setting time of concrete
C) To evaluate the flow and consistency of concrete
D) To determine the water-cement ratio of concrete
C) To evaluate the flow and consistency of concrete
What factors can affect the slump of concrete?
A) Water-cement ratio
B) Aggregate size and shape
C) Admixtures
D) All of the above
D) All of the above
- Which type of specimens are commonly made and cured for compressive strength testing of concrete?
A) Cylinders
B) Cubes
C) Beams
D) Spheres
A) Cylinders
What is the purpose of curing concrete specimens?
A) To accelerate the hydration process
B) To reduce the compressive strength of concrete
C) To prevent moisture loss and maintain hydration conditions
D) To Increase the workability of concrete
C) To prevent moisture loss and maintain hydration conditions
What is the recommended curing period for concrete specimens before testing?
A) 3 days
B) 7 days
C) 14 days
D) 28 days
D) 28 days
What is the significance of determining the flexural strength of concrete?
A) Тo assess its resistance to weathering
B) To evaluate a resistance to abrasion
C) To ensure structural safety and serviceability
D) To measure its resistance to shrinkage
C) To ensure structural safety and serviceability
What is the recommended curing period for concrete beam specimens before testing?
A) 3 days
B) 7 days
C) 14 days
D) 28 days
D) 28 days
How does the water-cement ratio affect the flexural strength of concrete?
A) Higher water-cement ratios result in higher flexural strength
B) Lower water-cement ratios result in higher flexural strength
C) Water-cement ratio has no significant effect on flexural strength
D) The effect of the water-cement ratio depends on the type of aggregates used
B) Lower water-cement ratios result in higher flexural strength
What precaution should be taken when conducting flexural tests on concrete beam specimens?
A) Testing specimens with visible cracks or defects
B) Using excessive loading rates
C) Testing specimens before the end of the curing period
D) Testing specimens with insufficient compaction
C) Testing specimens before the end of the curing period
How does the size and shape of concrete beam specimens affect the flexural strength?
A) Larger and thicker specimens generally have higher flexural strength
B) Smaller and thinner specimens generally have higher flexural strength
C) Specimen size and shape have no significant effect on flexural strength
D) The effect of size and shape depends on the curing conditions
B) Smaller and thinner specimens generally have higher flexural strength
What is the significance of determining the flexural strength of concrete in construction рrojects?
А) To estimate its thermal conductivity
B) To assess its resistance to chemical attacks
C) To ensure compliance with design requirements and standards
D) To evaluate its resistance to shrinkage cracks
C) To ensure compliance with design requirements and standards
What does the determination of specific gravity and absorption of coarse aggregates measure?
A) The particle size distribution of aggregates
B) The water-cement ratio in concrete mixtures
C) The voids in aggregates
D) The density and porosity of aggregates
D) The density and porosity of aggregates
What is the purpose of the specific gravity and absorption test in coarse aggregate experimentation?
A) To assess the fineness modulus of aggregates
B) To determine the workability of concrete mixtures
C) To evaluate the moisture susceptibility of aggregates
D) To calculate the voids ratio in aggregates
C) To evaluate the moisture susceptibility of aggregates
- What is the primary purpose of conducting a tensile stress on steel?
A) To measure the hardness of steel
B) To determine the ductility of the steel
C) To assess the electrical conductivity of the steel
D) To calculate the thermal expansion coefficient of the steel
B) To determine the ductility of the steel
Which the following properties is NOT typically measured during a tensile test?
A) Yield Strength
B) Ultimate tensile strength
C) Young’s modulus
D) Hardness
D) Hardness
At what point during a tensile test does the yield point occur?
A) Before the specimen starts to deform
B) At the beginning of plastic deformation
C) When the specimen fractures
D) After the specimen is completely stretched
B) At the beginning of plastic deformation
What does the term “ultimate tensile strength” refer to in a tensile test?
A) The maximum load the specimen can withstand before breaking
B) The load at which the specimen starts to deform plastically
C) The load at which the specimen returns to its original length
D) The load at which the specimen fractures
A) The maximum load the specimen can withstand before breaking
During a tensile test, what does the term “strain” refer to?
A) The force applied to the specimen
B) The change in length of the specimen relative to its original length
C) The deformation of the specimen under load
D) The ability of the specimen to resist deformation
B) The change in length of the specimen relative to its original length
Which of the following factors does NOT affect the results of a tensile test?
A) Temperature
B) Specimen geometry
C) Testing speed
D) Color of the specimen
D) Color of the specimen
What is the significance of the elongation percentage in a tensile test?
A) It indicates the ability of the material to resist deformation
B) It measures the change in length of the specimen before fracture
C) It determines the hardness of the material
D) It measures the electrical conductivity of the material
B) It measures the change in length of the specimen before fracture
Which of the following is NOT a common failure mode observed in tensile testing of steel?
A) Necking
B) Shear failure
C) Ductile fracture
D) Brittle fracture
B) Shear failure
What does the term “modulus of elasticity” represent in a tensile test?
A) The ability the material to resist deformation
B) The ratio of stress to strain within the elastic region
C) The load at which the materiel starts to deform plastically
D) The maximum load the material can withstand before fracture
B) The ratio of stress to strain within the elastic region
What is the unit of measurement for yield strength in a tensile test?
A) Newtons per square meter (N/m^2)
B) Pascals (Pa)
C) Kilograms (kg)
D) Newtons (N)
A) Newtons per square meter (N/m^2)
