Load dependent loading

Question 1

Important properties of hardened concrete.

Answer 1

Strength, Deformation under load, Durability, Permeability, Shrinkage

Question 2

What is compressive strength?

Answer 2

The max load that can be carried per unit area of concrete.

Question 3

Tensile strength?

Answer 3

Flexural strength of concrete.

Question 4

What specimen shapes are used in testing?

Answer 4

Cube, cylinder, square prism

Question 5

Types of deformation

Answer 5

Load dependent (Elastic, Creep)
Load independent (shrinkage, Thermal expansion/contraction)

Question 6

Is concrete elastic and why?

Answer 6

It is not truly elastic due pore structure, microcracks and irreversible response to loading.

Question 7

Factors influencing E? (E=stress/strain)

Answer 7

1. Concrete strength
2. aggregate amount, nature, shape, size
3. Rate of loading
4. Moisture of specimen

Question 8

Types of creep recovery.

Answer 8

instantaneous, creep

Question 9

Factors affecting creep?

Answer 9

1. applied stress
2. w/c ratio
3. temperature
4. change in relative humidity
5. Aggregate content
6. Aggregate type
7. geometry