prefi (t/f)

Question 1

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

Answer 1

True

Question 2

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

Answer 2

TRUE

Question 3

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

Answer 3

TRUE

Question 4

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.

Answer 4

TRUE

Question 5

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

Answer 5

FALSE

Question 6

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

Answer 6

TRUE

Question 7

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

Answer 7

true

Question 8

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

Answer 8

true

Question 9

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.

Answer 9

TRUE

Question 10

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.

Answer 10

true

Question 11

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.

Answer 11

true

Question 12

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.

Answer 12

TRUE

Question 13

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.

Answer 13

true

Question 14

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

Answer 14

true

Question 15

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

Answer 15

FALSE

Question 16

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.

Answer 16

true

Question 17

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

Answer 17

true

Question 18

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.

Answer 18

true

Question 19

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

Answer 19

TRUE

Question 20

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

Answer 20

TRUE

Question 21

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

Answer 21

TRUE

Question 22

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

Answer 22

TRUE

Question 23

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.

Answer 23

TRUE

Question 24

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

Answer 24

TRUE

Question 25

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

Answer 25

TRUE

Question 26

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

Answer 26

TRUE

Question 27

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

Answer 27

TRUE

Question 28

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

Answer 28

TRUE

Question 29

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

Answer 29

FALSE

Question 30

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

Answer 30

TRUE

Question 31

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.

Answer 31

TRUE

Question 32

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

Answer 32

FALSE

Question 33

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.

Answer 33

TRUE

Question 34

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.

Answer 34

TRUE

Question 35

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.

Answer 35

TRUE

Question 36

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

Answer 36

TRUE

Question 37

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.

Answer 37

TRUE

Question 38

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.

Answer 38

TRUE

Question 39

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

Answer 39

TRUE

Question 40

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

Answer 40

TRUE