CE264 - Midterm

Question 1

It is the primary purpose of proper batching, mixing, and handling of fresh concrete

Answer 1

For ensuring strong and durable structures

Question 2

A method of batching is considered more accurate

Answer 2

Batching by Weight

Question 3

These methods are used for measuring air content in
fresh concrete

Answer 3

• Pressure Method
• Chace Air Indicator Method
• Gravimetric Method

Question 4

It causes a PLASTIC SHRINKAGE

Answer 4

Loss of water from cement paste

Question 5

A type of shrinkage occurs after setting if concrete is not properly cured

Answer 5

Drying Shrinkage

Question 6

It is a gradual increase in strain under sustained load

Answer 6

Creep

Question 7

The typical compressive strength range of normalweight concrete

Answer 7

20 to 40 MPa

Question 8

It indicates the ELASTIC PROPERTIES of concrete

Answer 8

Poisson’s Ratio

Question 9

A test for Hardness of concrete surface

Answer 9

Rebound Hammer Test

Question 10

Penetration Resistant Test is also known as the

Answer 10

Windsor Probe Test

Question 11

It helps detects the cracks and discontinuities

Answer 11

Ultrasonic Pulse Velocity test

Question 12

The concrete will swell slightly if:

Answer 12

It is continously cured in water

Question 13

How does aging affect concrete?

Answer 13

Decreases the permeability

Question 14

A factor that increases the risk of drying shrinkage in concrete

Answer 14

High water-cement ratio

Question 15

These factor that affecting creep in concrete

Answer 15

• Age of Concrete
• Load Duration
• Water-cement Ratio

Question 16

The typical range for Poisson’s ratio of concrete

Answer 16

0.11 to 0.21

Question 17

These factors that will contribute to increased shrinkage

Answer 17

• High water-cement ratio
• High cement content
• Existence of steel reinforcement

Question 18

A type of concrete is mixed completely in a stationary mixer and delivered in an agitator truck

Answer 18

Central - Mixed Concrete

Question 19

The maximum stress without causing permanent strain

Answer 19

Elastic Limit

Question 20

These tests are typically used for measuring concrete strength

Answer 20

• Rebound Hammer Test
• Flexural Strength Test
• Ultrasonic Pulse Velocity Test

Question 21

is generally the controlling design
factor

Answer 21

Strength

Question 22

is
desired for mixes with low cement content to
promote workability

Answer 22

Low Finess Modulus

Question 23

is measuring and introducing the concrete
ingredients into the mixer

Answer 23

Batching

Question 24

is mixed in a central plant and delivered to the job site in mixing trucks ready for placing

Answer 24

Ready - mixed Concrete

Question 25

is partially mixed
in a stationary mixer and completed in a
mixer truck

Answer 25

Shrink - mixed Concrete

Question 26

is mixed completely in a mixer truck

Answer 26

Truck - mixed Concrete

Question 27

it can be mixed in a mobile
batcher mixer at the job site

Answer 27

Mobile Batcher Mixed Concrete

Question 28

The pressure
method is based on _______, which
relates pressure to volume

Answer 28

Boyle’s Law

Question 29

is defined as the degree of cement hydration, which varies as a function of both time and
temperature

Answer 29

Maturity

Question 30

an ultimate strength pertaining to the
failure of beams by flexure equal to the
bending moment

Answer 30

Modulus of Rupture