Review Professor Class

Question 1

What properties are associated with that structure level of steel?

Answer 1

Atomic- Elastic modulus, stress
Micro - ductility
Macro- brittle vs ductile

Question 2

What atomic structures are attached to what properties?

Answer 2

Atomic bonding- e modulus

Atomic arrangement- crystalline vs amorphous

Question 3

What properties are associated with that structure level of concrete?

Answer 3

Atomic structure  mixed bonds  crystalline, amorphous 
Microstructure  capillary porosity, unhydrated cement particles  CSH, CH, microcracks, TZ 
Macrostructure  Voids (entrapped air voids), aggregates,  Hydrated cement paste (HCP)  Shrinkage cracks

Question 4

What is elastic modulus influenced by in concrete?

Answer 4

Aggregates and porosity

Question 5

What is stress influenced by?

Answer 5

w/c ratio 
	Curing
	Aggregate size
	TZ
	Porosity

Question 6

What is shrinkage and creep influenced by?

Answer 6

Microstructure

Atomic structure

Question 7

List different pore sizes names and sizes.

Answer 7

Gel porosity (10 nm)
Capillary porosity (100 nm)
Entrained air voids (100 micro m)
Entrapped air voids (1 mm)

Question 8

What are solid products of hcp?

Answer 8

CSH, CH, ettringite

Question 9

Hydration products?

Answer 9

CSH,CH, Ettringite , heat

Question 10

Rate of evolution of ettringite?

Answer 10

Ettringite forming, dormant period, CH and CSH (heat), ettringite transforms into monosulphate

Question 11

What properties are associated with that structure level of construction steel?

Answer 11

Atomic- e modulus

Micro- yield strength (influenced by processes)

Question 12

What properties are associated with that structure level of wood?

Answer 12

Atomic- e modulus, strength
Micro-toughness, shrinkage
Macro- anisotropic behavior

Question 13

What is found in the atomic, micro and macrostructure of wood?

Answer 13

Atomic-cell wall, mixed bonds, crystalline amorphous

Micro- lumen, wood cell

Macro- annual rings, rays, knots

Question 14

What is stiffness in wood altered by?

Answer 14

altered by processes that occur on atomic, micro and macro-structural scale! •moisture •density