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