Quantifying the Concrete Advantage in Parking Lots.
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Transcript of Quantifying the Concrete Advantage in Parking Lots.
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Quantifying the Concrete Advantage in Parking Lots
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Design Benefits• Established rational
design - ACI 330• Integral curb and gutter• Fewer drainage
structures needed• Can be easily designed
to hold storm water• Can be colored and
textured to owner’s desires
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Maintenance
• Proven fewer repairs • No annual resealing
needed• Low annual
maintenance cost• No business
interruption
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Performance• Proven long life• Strength increases
with age• Evenly carries heavy
loads• No potholes, bumps,
or wrinkles• Resistance to
freeze-thaw
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Safety• Excellent light
reflectance• Greater visibility• Rigid pavement means
no potholes• High skid resistance• Less ponding means
less re-freezing and less exposure to liability in cold weather climates
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Lower Total Ownership Costs
• Competitive first cost
• Proven longer life
• Lower life cycle costs
• Predictable cost estimates
• Energy Costs• Less lighting needed
• Savings as great as 30%
• Low heat absorption• 7° - 10° F cooler ambient air temp• Lower cooling costs
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• Uses less raw materials
• No hazardous materials used
• Recycled materials can be used
• Conserves petroleum resources
• Does not pollute waterways
Environmentally Friendly
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Compare Concrete and Asphalt• Portland Cement Concrete
• Hot Mix Asphalt– Formerly known as Bituminous Concrete
• Both use sand and stone
• How these raw materials are bound together make the difference
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Portland Cement Concrete
• Industrial strength glue as binder– Inorganic – Does not break down– Gains strength over time
• Creates a rigid pavement– Able to evenly carry loads
• Low maintenance
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Hot Mix Asphalt• Uses “Scotch-tape like” adhesive for binder
– Requires pressure (compaction)– Petroleum-based organic adhesive – breaks down
due to heat, water, & UV rays– Becomes weaker over time
• Requires costly seal coats & overlays to replenish this “adhesive”
• Creates a flexible pavement– Strength and durability highly reliant on quantity and
quality of base material
• Results in high maintenance costs
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Pavement Failure• Not due to # of years• Due to stress of vehicle traffic
6,600 lbs6,600 lbs
pressure < 29 psi pressure 290 psi
Concrete’s rigidity spreads the load over a large areaand keeps pressures on the subgrade low.
Concrete Asphalt
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Concrete vs. Asphalt
• Apples-to-apples comparison of pavement design should always be considered
• It takes 8” or more of asphalt to equal load carrying capacity of a 5” concrete pavement
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Sample Parking Lot Comparison
• Utilizing NRMCA Concrete Pavement Analyst
• 100,000 ft2
• Average daily truck traffic (ADTT) 25
• Subbase soil type - Common - CBR 3
• Planned service life 20 years
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ACI 330 Guidelines
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Design Summary
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Cost Summary(current costs – in thousands)
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Concrete Parking Lots are a Smart Business Choice