seminario internacional construcción y rehabilitación con pavimentos de hormigón innovations in...
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Innovations and Pavement-Type Selection Topics Robert Rodden, P.E. www.robertrodden.com
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Stringless Paving Innovations in Concrete Pavement Construction
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FREE Stringless Paving Training! • Available around the clock, 365 days per year.
• No cost to par;cipants.
• Cer;ficates of comple;on may count toward a total of 11.0 professional development hours (PDHs).
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What is Stringless Paving? § Alternative to conventional
stringline paving. § Uses electronic guidance
systems to replace pins, sensors, and “stringline.”
§ Electronic guidance system controls elevation and steering of the paving machine(s).
§ Sometimes referred to as 3D paving.
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Some of the Benefits of Stringless Paving • Eliminates labor intensive stringline
surveying for hubs and stakes. • Reduces opportunities to introduce
surveying errors. • Reduces overall preparation time on
the grade. • Places engineer’s design directly into
machine(s). • Controls elevation, slope, and steer of
machines with truer input. • Reduces or eliminates cords created
by stringline hubs/pins. • Reduces wave patterns introduced by
improperly tensioned stringline sensors. • Increases phasing and traffic control
pattern considerations.
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Stringlines = Chords
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Stringless = Smooth Curves
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Stringless Technology Extends Beyond Paving
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Two Most Common Stringless Systems in Use Today
Total Station Control GPS + Laser Control
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Stringless Components
• In the Field: § Control Points. § Instruments (Robotic
Total Stations, GPS Base Station or Lasers).
§ Radios.
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• On the Machine: § Computer & Software. § Dual Axis Slope Sensors. § Masts.
§ If Using Total Station Control: � Radios � 360o Prisms
§ If Using GPS Control: � GPS Receiver
§ If Using Laser Control: � Laser Receiver
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How the Components Talk to One Another � All components
networked together on CANBus.
� “Internet for machines”
� Each message has unique ID so only the component that needs it will read it.
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CANBus
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Bringing the Components Together
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Benchmark Control Points (Hubs)
Robotic Total Station
Radio on Total Station
Radio on Equipment
360o Prism on Equipment
3D Model
On-Board Stringless Computer
Machine Control
Computer
Equipment Hydraulics
Dual Axis Slope Sensor
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Equipment Advancements Innovations in Concrete Pavement Construction
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We Progressed Quickly
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But Some Things Still Look Familiar
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Zero Clearance Paving
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Variable Width Pavers
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Real-Time Smoothness
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Sometimes Testing Advances Drive Equipment Advancements
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Future of Construction • Stringless/GPS integration into joint layout and sawing operations?
• Saw + seal in one single operation?
• Manufacturers don’t reveal new ideas until patents are filed and its ready…
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The Economics of Pavements Life-Cycle Cost Analysis (LCCA)
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Decision Points in Pavement Type Selection • Historically, initial cost has driven pavement type selection
• Other factors are increasingly important, but cost is still king
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COST
Sustainability
Safety
User Experience
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Concrete has a Lower Inflation Rate
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24 Source: ACPA EB011, Life Cycle Costs Analysis
Oil and Asphalt Import/Export Practices
and Refining
Processes Impact This On a Local
Level!
In Many Areas,
Concrete Can
Now Compete
On Initial Cost
Alone!
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Concrete Pavements are EXPECTED to Last Longer by Owners
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Life-Cycle Costs Accounts for This
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CONCR
ETE
ASPH
ALT
RE
AL-
WO
RLD
CA
SE
F
OR
EX
AM
PL
E P
UR
PO
SE
S O
NL
Y
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Failure to Account for LCCA is Shortsighted 5/
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27 Asphalt prices have increased more since these plots
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LCCA Guidance in Spanish! • Translated by:
• Soon available through:
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Competition Pays Dividends to the Owner (and TAXPAYERS) • A complex relationship exists
between number of bidders, volume of market, unit price of materials, etc.
• However, there is a clear trend of lower prices for both pavements with increasing levels of competition
• Variability in unit prices also decreases with increasing competition
• Owners can purchase more pavements with the same investment!
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http://competitionpaves.org/wp-content/uploads/2014/11/PavementTypeSelection-ISCR-Prague.pdf
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Sustainability of Pavements Life-Cycle Assessment (LCA)
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Life-Cycle Assessment (LCA)
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• Quantifies CO2 and other environmental
impacts of a specific pavement section in a specific location similar to how LCCA does $
• The end result is extremely dependent on: � Pavement section, cut/fill, etc. � Materials used, recycled content, by-product usage,
hauling distance, etc. � Use phase: color of surface can impact lighting,
rigidity of the surface impacts fuel usage, etc.
• There is no GENERAL answer to this!
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Questions? Robert Rodden, P.E. www.robertrodden.com
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