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CE 264 (CMT) > prefi (t/f) > Flashcards

prefi (t/f) Flashcards

experiments

1
Q

The setting time of cement is influenced by factors such as the fineness of cement and the temperature of water.

A

True

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2
Q

The normal consistency of cement is expressed as a percentage of the weight of cement.

A

TRUE

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3
Q

The Los Angeles abrasion test is used to evaluate the hardness, strength, and durability of aggregates.

A

TRUE

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4
Q

The Los Angeles abrasion test results are expressed as a percentage of the original weight. This percentage is known as the Los Angeles Abrasion Value. The lower the value, the stronger the aggregate.

A

TRUE

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5
Q

The final setting time of cement is the time taken for the cement paste to reach its maximum strength and become fully hardened.

A

FALSE

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6
Q

The consistency of cement is influenced by factors such as the type of cement, water-cement ratio, temperature, and presence of admixtures.

A

TRUE

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7
Q

The strength of cement can be adversely affected by factors such as improper curing, excessive water content, and the presence of impurities.

A

true

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8
Q

The density of cement can vary depending on factors such as the type of cement and the fineness of the cement particles.

A

true

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9
Q

The specific gravity of cement is typically determined using the pycnometer method, where the cement sample is weighed in air and then weighed again when immersed in water.

A

TRUE

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10
Q

The absorption of coarse aggregates refers to the amount of water that can be absorbed by the aggregate particles, expressed as a percentage of the dry weight of the aggregate.

A

true

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11
Q

The absorption of fine aggregates can be determined by soaking the aggregates in water for a specified period of time and then weighing them to measure the increase in weight.

A

true

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12
Q

The absorption of fine aggregates refers to the amount of water that can be absorbed by the aggregate particles, expressed as a percentage of the dry weight of the aggregate.

A

TRUE

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13
Q

The absorption of fine aggregates can be determined by immersing the aggregates in water for a specified period of time and then weighing them to measure the increase in weight.

A

true

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14
Q

The moisture content of aggregates can affect the workability and strength of concrete mixtures.

A

true

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15
Q

The moisture content of aggregates is not affected by factors such as the weather conditions during transportation and storage.

A

FALSE

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16
Q

The slump of concrete is determined by measuring the vertical difference between the height of the mold and the height of the concrete after it settles.

A

true

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17
Q

The slump test can provide an indication of the water content and the overall quality of the concrete mixture.

A

true

18
Q

During the curing process, it is important to prevent the concrete specimens from drying out too quickly, as rapid moisture loss can negatively impact their strength.

A

true

19
Q

Curing compounds or plastic sheets can be used to cover the concrete specimens and retain moisture during the curing period.

A

TRUE

20
Q

The curing period for concrete specimens can be extended beyond 7 days to achieve higher strength, depending on the specific requirements of the project.

A

TRUE

21
Q

The normal consistency of cement refers to the water content required to produce a cement paste of standard consistency.

A

TRUE

22
Q

The normal consistency of cement is determined by conducting the Vicat apparatus test with needle.

A

TRUE

23
Q

The Los Angeles abrasion test is a method used to measure the degradation of mineral aggregates of standard gradings resulting from a combination of actions including abrasion or attrition, impact, and grinding in a rotating steel drum containing a specified number of steel spheres.

A

TRUE

24
Q

In the Los Angeles abrasion test, the sample should be completely dry before testing.

A

TRUE

25
Q

The setting time of cement refers to the time it takes for the cement paste to harden and gain strength.

A

TRUE

26
Q

The initial setting time of cement is the time taken for the cement paste to lose its plasticity and become rigid..

A

TRUE

27
Q

The strength of cement increases with age, as the hydration process continues, and the cementitious materials form stronger bonds.

A

TRUE

28
Q

The density of cement is a measure of its mass per unit volume and is typically expressed in kilograms per cubic meter (kg/m3).

A

TRUE

29
Q

The specific gravity of cement is the ratio of the density of cement to the density of kerosene at a specific temperature.

A

FALSE

30
Q

The specific gravity of fine aggregates is a measure of their density compared to the density of water.

A

TRUE

31
Q

The specific gravity of coarse aggregates can be determined using the water displacement method, where the aggregate is weighed in air and then weighed again when submerged in water.

A

TRUE

32
Q

The specific gravity of fine aggregates is a measure of their mass compared to the mass of water.

A

FALSE

33
Q

The specific gravity of coarse aggregates can be determined using the pycnometer method, where the aggregate is weighed in air and then weighed again when immersed in water.

A

TRUE

34
Q

The moisture content of aggregates refers to the amount of water present in the aggregate particles, expressed as a percentage of the dry weight of the aggregates.

A

TRUE

35
Q

The moisture content of aggregates can be determined by weighing a sample of the aggregates, drying it in an oven, and then re-weighing it to measure the loss in weight.

A

TRUE

36
Q

The slump test is a commonly used method to measure the workability and consistency of fresh concrete.

A

TRUE

37
Q

the slump test, a cone-shaped mold is filled with fresh concrete, and the mold is then lifted vertically, allowing the concrete to settle and spread.

A

TRUE

38
Q

Concrete specimens are typically made by filling cylindrical molds with fresh concrete and compacting it using a mechanical tamper and tamping it 20 times per layer.

A

TRUE

39
Q

The curing of concrete specimens involves providing optimal moisture and temperature conditions to facilitate the hydration process and achieve proper strength development.

A

TRUE

40
Q

Concrete specimens should be cured in a controlled environment for a minimum period of 7 days to achieve adequate strength development.

A

TRUE

CE 264 (CMT) (6 decks)

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