Year 12 – Civil Structures - 2016

Teacher Development Program

Bringing schools and Engineering together

Michael van Koeverden

Teacher Development Program

Bringing schools and engineering together

• EA to be your link with the Engineering Profession / Industry

• These forums to provide important networking opportunities with other

teaching professionals

• We want to assist in providing exciting ways of presenting concepts with real

world examples and applications.

• We encourage a link of support with exam assessors

• We would like to make clear the pathways to engineering that exist for all

students- Professional, Trades, VET

• WE AIM TO BE A FACILITATOR IN SUPPORTING YOU

Teacher Development Program

Bringing schools and engineering together

• Drop box

• Creation of the “ENGINEERING STUDIES RESOURCE CENTRE” on Dropbox.

• Teachers and Engineers Australia to share and communicate useful resources.

Teacher Development Program

Bringing schools and engineering together

• Engineering Materials - Civil Structure (Pavement)

Eng. Syllabus Areas:

• H1.2- Diff b/w mat

props & selection,

• H2.1- Determine mat

props and uses

• H4.1- Tech changes in

Eng.

Teacher Development Program

Bringing schools and engineering together

Concrete Slipformed Pavement

Teacher Development Program

Bringing schools and engineering together

Teacher Development Program

Bringing schools and engineering together

Cast-insitu: Slipformed pavement

concrete

(RMS R82- Subbase Concrete,

RMS R83- Plain Base Concrete)

- Place concrete onto concrete

- Design life long but $ cost high

- Construction quality &

workmanship critical - one

chance only to get right !

Teacher Development Program

Bringing schools and engineering together

Concrete Property:

Plastic property

•Slump lower for slip formability

•Low bleed water content in mix

Hardened property

•Compressive strength

•Drying Shrinkage

•Durability

Teacher Development Program

Bringing schools and engineering together

Material Interactions-

•Subgrade- Soil/ clay, gravel, hard-rock etc.

•Subbase- concrete/reinforcing steel

•Base- concrete / reinforcing steel/ fibres

Concrete Structural Properties

•Compressive Strength at 28days

•Cover to reinforcing steel- corrosion

•Construction quality- variable

experience needed

•Repair vs performance- cost $

Teacher Development Program

Bringing schools and engineering together

Corrosion

Teacher Development Program

Bringing schools and engineering together

Steel Corrosion in Concrete

• Passivation of steel reinforcement by

high pH of concrete ~ pH=13

• pH >10.5 steel wont rust if steel

completed covered.

• Initiation of corrosion once chloride

limits at the steel reach a high enough

limit

• Propagation is the time taken for

corrosion to extend throughout the

steel

Teacher Development Program

Bringing schools and engineering together

Problems with materials?

Teacher Development Program

Bringing schools and engineering together

Sprayed bituminous Sealing

Aggregate Surface Asphalt

Teacher Development Program

Bringing schools and engineering together

Sprayed bituminous Sealing Aggregate Surface

- Cheapest road surfacing but shortest design life

~ 3 – 7 years

Asphalt -

more expensive -design life ~7 – 15 years

Concrete Pavement

- Dearest with design life ~ 40 – 100years

Teacher Development Program

Bringing schools and engineering together

Testing and

understanding of

stone property - Basic

Understand limits in

tensile capacity of

materials so design uses

high comp. strength of

mat.

History / Technological change:

Teacher Development Program

Bringing schools and engineering together

• Most National, State and

Territory Governments and

regulators require construction

material products be tested and

reported by a NATA accredited

laboratory to a set standard(s)

What is NATA ?

NATA

Teacher Development Program

Bringing schools and engineering together

NATA

• 1945 NATA was formed at a

conference of all State and

Federal governments.

• The new NATA body was to

provide a national testing service

to Australia and would span all

technical, industry, chemical,

medical and geographical areas

A world’s

first !

Teacher Development Program

Bringing schools and engineering together

NATA

• 3000 NATA facilities

• 50 other countries use NATA’s expertise

• 175 NATA Employees

• 3000 Volunteer NATA Technical experts

Teacher Development Program

Bringing schools and engineering together

Test Standards • Contractor Standards

ASTM- USA EN/CEN-Europe ISO- International

Teacher Development Program

Bringing schools and engineering together

Testing/understanding- conventional steel reinforcing only span so far.

Pre-tensioning/Post-tensioning- can significantly increase spans

C

C

C C

T

T

Teacher Development Program

Bringing schools and engineering together

Pre-tensioned Concrete

• Cables tensioned

• Concrete cast onto cables and sticks.

• At transfer cables cut and concrete placed in

compression

Teacher Development Program

Bringing schools and engineering together

Post-tensioned Concrete

• Cables in ducts not tensioned

• Concrete cast onto ducts

• Cables stressed and compression provided by barrel /wedge

• Ducts grouted to protect cables long-term

• Concrete placed in compression some time after casting.

Teacher Development Program

Bringing schools and engineering together

Material property:

Teacher Development Program

Bringing schools and engineering together

Communications (DS/MVK)

• All communications must be: Clear, Factual & Concise

• Verbal/oral – clear instructions (recorded somewhere)

• Written – reports- do not embellish or make claims.

• Implied- professional service – duty of care to public.

• As professional you can be sued for any of above.

• PI insurance premiums are based on above depending on

the insurers view of your perceived risk to others.

Teacher Development Program

Bringing schools and engineering together

Communications (DS/MVK)

• Expert Witness work- will be cross-examined in court to explain

your opinion expressed by you.

• Need to confirm on what your opinion was based

• Must act on most recent knowledge at time of your report writing.

• But still have a duty of care to public.

Teacher Development Program

Bringing schools and engineering together

Teacher Development Program

Bringing schools and engineering together

Teacher Development Program

Bringing schools and engineering together

• Discussion

Engineers Australia is the trusted voice of the profession. We are the global home for engineering professionals renowned as leaders in shaping a sustainable world. engineersaustralia.org.au