CE264 - Midterm Flashcards
Same as Quiz 2
It is the primary purpose of proper batching, mixing, and handling of fresh concrete
For ensuring strong and durable structures
A method of batching is considered more accurate
Batching by Weight
These methods are used for measuring air content in
fresh concrete
- Pressure Method
- Chace Air Indicator Method
- Gravimetric Method
It causes a PLASTIC SHRINKAGE
Loss of water from cement paste
A type of shrinkage occurs after setting if concrete is not properly cured
Drying Shrinkage
It is a gradual increase in strain under sustained load
Creep
The typical compressive strength range of normalweight concrete
20 to 40 MPa
It indicates the ELASTIC PROPERTIES of concrete
Poisson’s Ratio
A test for Hardness of concrete surface
Rebound Hammer Test
Penetration Resistant Test is also known as the
Windsor Probe Test
It helps detects the cracks and discontinuities
Ultrasonic Pulse Velocity test
The concrete will swell slightly if:
It is continously cured in water
How does aging affect concrete?
Decreases the permeability
A factor that increases the risk of drying shrinkage in concrete
High water-cement ratio
These factor that affecting creep in concrete
- Age of Concrete
- Load Duration
- Water-cement Ratio
The typical range for Poisson’s ratio of concrete
0.11 to 0.21
These factors that will contribute to increased shrinkage
- High water-cement ratio
- High cement content
- Existence of steel reinforcement
A type of concrete is mixed completely in a stationary mixer and delivered in an agitator truck
Central - Mixed Concrete
The maximum stress without causing permanent strain
Elastic Limit
These tests are typically used for measuring concrete strength
- Rebound Hammer Test
- Flexural Strength Test
- Ultrasonic Pulse Velocity Test
is generally the controlling design
factor
Strength
is
desired for mixes with low cement content to
promote workability
Low Finess Modulus
is measuring and introducing the concrete
ingredients into the mixer
Batching
is mixed in a central plant and delivered to the job site in mixing trucks ready for placing
Ready - mixed Concrete
is partially mixed
in a stationary mixer and completed in a
mixer truck
Shrink - mixed Concrete
is mixed completely in a mixer truck
Truck - mixed Concrete
it can be mixed in a mobile
batcher mixer at the job site
Mobile Batcher Mixed Concrete
The pressure
method is based on _______, which
relates pressure to volume
Boyle’s Law
is defined as the degree of cement hydration, which varies as a function of both time and
temperature
Maturity
an ultimate strength pertaining to the
failure of beams by flexure equal to the
bending moment
Modulus of Rupture
