Transcript Sustainability

Heath Curnow
CEO: STABIL-LIME GROUP
Vice President: AustStab
IPWEA Meeting
3, 8 15 May 2012
Topics covered over the next 10 min
 Road Recycling for Sustainability
 Advantages & Application of In-Situ Stabilisation
to Improve Engineering Properties.
 Consider Whole of Life Costs to Determine
whether or not to Stabilise
 The role of the association and what we can do
to help you day to day
Pavement Recycling by
In Situ Stabilisation
 Process of improving pavement material
properties by in situ mixing in accordance with a
mix design.
 According to Sustainability Victoria & the
Institute of Engineers, Sustainability refers to:
Economic
Environmental
Social
Sustainable Advantages of Pavement Recycling
 Economic Sustainability:
 Cost effective to treat saturated/soft materials rather than the
cost to excavate and replace.
 Design & Construct efficiency by increasing the strength of
the lower pavement layers and saving on the thickness of
more expensive upper pavement layers.
 Environmental Sustainability:
Recycling reduces dependence on limited quarry
resources by reusing worn out pavement materials
or improving subgrade properties.
Stabilising unsealed roads increases durability and
reduces re-grading & re-sheeting frequency.
Social Sustainability:
Construction expediency & reducing traffic
movements significantly reduces disruption
to local traffic during construction.
Tailor mix design to improve specific material properties:
Plasticity (PI) & Permeability
Strength & Moisture Content
.
Improve material grading by pulverising during mixing of Binders.
Correct shape & moisture condition to ensure OMC at
compaction.
.
Stabilisation can be used on new
works, rehabilitation works and on
unsealed pavements
Savings can be made in the sub grade, sub
base or base material using materials already
on site
 DOTARS study on unsealed roads, completed in 2010 showed:
Stabilised Base
Granular overlay
Initial cost/km
$17000
$13000
Life before replacement
12 years
8 years
Resultant cost pa
$1,400
$1,600
Minor maintenance
schedule
Once per year
2 – 3 times per year
Cost per maintenance/km
$1,000
$1,000
Cost per annum
$1,000
$2,500
Total Cost
$2,400
$4,100
Whole of Life Costs
1. Asphalt patch work quilt is an expensive surface band aid
typically with a max. 2 year life.
2. Pavement continues to exponentially deteriorate as do costs to
rehabilitate.
3. Consider sooner option to join patches & recycle with 30 year
design life & minimal maintenance.
AustStab is able to provide you with
information and tools
Members register
Training
-Upcoming
Training
CPEE and
AustStab Course
Melbourne
October 2012
Frequently asked
Questions
Contractor
Register
Publications
- The guide
- Work Tips
- Published articles
Information on
design and
specifications
AustStab in Victoria is wanting to engage with
local government, state government,
contractors and consultants – You!
Engage
clients
Attend
CPEE
course
Stabilisation
and
recycling
increases