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Year 12 – Civil Structures - 2016
Teacher Development Program
Bringing schools and Engineering together
Michael van Koeverden
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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
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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.
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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.
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Teacher Development Program
Bringing schools and engineering together
Concrete Slipformed Pavement
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Teacher Development Program
Bringing schools and engineering together
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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 !
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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
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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 $
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Teacher Development Program
Bringing schools and engineering together
Corrosion
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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
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Teacher Development Program
Bringing schools and engineering together
Problems with materials?
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Teacher Development Program
Bringing schools and engineering together
Sprayed bituminous Sealing
Aggregate Surface Asphalt
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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
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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:
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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
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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 !
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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
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Teacher Development Program
Bringing schools and engineering together
Test Standards • Contractor Standards
ASTM- USA EN/CEN-Europe ISO- International
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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
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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
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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.
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Teacher Development Program
Bringing schools and engineering together
Material property:
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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.
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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.
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Teacher Development Program
Bringing schools and engineering together
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Teacher Development Program
Bringing schools and engineering together
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Teacher Development Program
Bringing schools and engineering together
• Discussion
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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