Road Maintenance & Preservation: An Innovative Green & - - PowerPoint PPT Presentation

Road Maintenance & Preservation: An Innovative Green & Productive Approach

Outline of Presentation

• Introduction
• Flexible and Concrete Pavements
• Resurfacing: Current Practice and Issues
• What Road Owners Really Want
• E-Krete - The Green Answer to Your Pavement

Problems

• Comparison
• Machineries used (Premix vs E-Krete)
• Conclusions

Introduction

• First recorded use of asphalt as a road building material was in

Babylon around 625 B.C. while concrete was a more recent phenomenon, around 1894 with the placement in Bellefontaine, Ohio

• Asphalt, cheaper - roads, expressways , air and sea ports
• Concrete Pavement, being more durable has taken over the duty

particularly in areas of high and heavy traffic such as road junctions, bus bays, bus lanes and aircraft parking area to name a few.

• With traffic jumping by leaps and bounds in recent memory è

increased frequency of pavement restoration. Rise in raw materials has also made pavement restoration an expensive exercise. Not surprisingly, pavement restoration works have come under heavy scrutiny- unnecessary wastes, environmental implications and escalating costs (particularly that of asphalt)

Typical Layers of Pre-Mix

Flexible and Rigid Pavements

• Flexible pavements have base courses
• f broken stone pieces either compacted

into place or glued together with bitumen to form asphalt. Commonly known as asphalt or asphalt concrete pavements

• r premix.
• Rigid pavements are constructed of

Portland Cement concrete slabs resting

• n a prepared sub base of granular

material or directly on a granular

• subgrade. Commonly known as concrete

pavement.

Problems with Current Materials

Inherent characteristics of the materials used to make roads. For Flexible Pavement, this include:-

§ Asphalt’s greatest enemy is water and U.V. § Being a by-product of crude oil, motor oil and hydraulic

fluids will destroy Asphalt

§ U.V. destroys the asphaltic binder that holds the aggregate. § Asphalt absorbs and retains heat. § Oxidation begins immediately on fresh asphalt. § Cracks in asphalt lead to base failure by water intrusion. § Coal tar sealers are extremely toxic.

Problems with Current Materials

Though there are fewer concerns with Rigid pavements, the following problems do exist:-

§ Spalling § Cracks § Slippery surface

Current Practices of Pavement Restoration

Flexible Pavements Milling Top-up Compaction Rigid Pavement Hacking of old concrete Base Preparation Casting of Concrete Time-consuming and expensive processes, that produces TRAFFIC CONGESTION and

• ther inconveniences

as a result; Requires many men and machines to accomplish

Issues with Current Practices

• Takes long time to do
• Causes inconveniences to road users, e.g. traffic congestion
• Costly
• Many environmental implications- noise, pollution etc
• Wastage of natural resources
• Treat pavements as expense not an ASSET
• Possible health issues

What Road Owners Want

Good resurfacing materials with the following characteristics:

1.

A durable wearing surface unaffected by U.V., water, and automotive fuels and fluids

2.

A paving material that is cost effective, price stable, low maintenance, and environmentally friendly (reduces Urban Heat Islands)

3.

A paving material that bonds to new asphalt, severely

• xidized asphalt and concrete

4.

A paving material that is fast and easy to apply, has good skid properties and low noise riding surface

5.

Comes in various colors to suit different needs and are versatile

Solution: Resurfacing

• We can do away with all this hacking and milling

altogether è SAVES TIME & $$

• Possible because the roads in US and Singapore are

basically structurally sound, thanks to the vigilance of

• ur Road Authorities (DOTs in US and LTA in

Singapore)

• It is vital that any defects must be repaired early when

they are only at the surface.

• WE HAVE THE TECHNOLOGY

E-Krete: The Green Solution

• A US product from the State of Mississippi, USA
• A cementitious polymer composite micro-overlay

(PCMO) for roads (both rigid and flexible) and bridges, even steel ones.

• Used in US since 1996 with little or no defects
• The only EPA approved material for road use.
• LEEDS approved (helps cools surface temp by about 7

degree C)

• APPROVED BY: NASA, E.P.A., D.O.T, FAA
• Currently undergoing trial with LTA, NTU and NParks
• Already used in some local projects

Main Characteristics of E-Krete

• A water-based, cementitous

polymer composite

• Fast curing ( Can be open to

traffic within 2 hours in Sunny Singapore, 5 hours at night)

• On the average only 3mm

thickness

• Good skid properties (Friction

number can be varied from BPN 50s to 90s)

• Offers slight flexibility
• Resistance to acids, water,

motor and hydraulic oils

• Partner of EPA’s “Design for

Environment” arm

• LEEDS approved
• Non-toxic and safe in all

handling conditions

• Mixing is at room temperature

so no need to worry about being scalded by hot liquid

• Comes in variety of colors
• Better Night time Visibility

E-Krete Application

Pull-­‑Blade ¡ Placer ¡Machine ¡with ¡ Flex ¡Sled ¡ Hopper ¡Spray ¡

E-Krete can be applied manually using a pull blade or done by a placer machine. It can also be sprayed on using a hopper.

E-Krete Application

High Capacity Work Horse for Expressways

Application: An Easy 3-Step Process

STEP ¡1 ¡ Thorough ¡cleaning ¡to ¡ remove ¡debris ¡ STEP ¡2 ¡ Mixing ¡of ¡E-­‑Krete ¡ ¡ ( ¡Powder ¡(cement/aggregate ¡+ ¡Resin) ¡ STEP ¡3 ¡ Lay ¡E-­‑Krete ¡ ¡

Any repair work is also simple. Just mark out area of repair and apply over with fresh E-krete. Good as NEW

Current Practice vs Using E-Krete

Description Current Method E-Krete Conclusion

Clean Surface Yes Yes 1 machine for E- Krete VS at least 3 machines for Premix Milling Machine Yes No Laying Machine With Fresh Asphalt With E-Krete Compaction Machine Yes No Curing Yes Yes

Summary: Five Benefits of E-Krete

Characteristics Reason Benefits

Low Maintenance

• a. Resistant to U.V., water, acid rain and automotive

fuels & hydraulic fluids

• b. Cost Effective (In terms of Life Cycle Costs)
• c. Stable Price (immune to oil price volatility
• d. 10-year warranty ensure money saved over life of

Warranty

• a. Money saved can be spent on other more

important priorities

• b. Effective and efficient Budget Planning

Green

• a. Leaves no carbon footprint
• b. Reduces Urban Heat Island Built-up
• c. EPA and LEEDS approved
• a. Helping the Environment
• b. Reduce Electricity Bills
• c. Help save Depleting Natural Resources

Fast and Easy Application No Milling. Bonds well to New/oxidized Asphalt and Concrete Saves time and Money Good Skid Properties/ Low Noise Riding Surface Use Specially Formulated Aggregate size mix blend Safer/ more pleasant travel for Motorists Variety of Colours Cater to the different needs of Traffic Management Control Safer roads for Everyone

COMPLETED PROJECTS

2009 – May, 2012

Staircase leading to Budget Terminal, Singapore Changi Airport

VIP Check-in, Terminal 3, Singapore Changi Airport

Progress Galvanizing, 19 Tuas Road

Baggage Area, Terminal 3, Singapore Changi Airport

Slip Road to Terminal 2, Singapore Changi Airport

Slip Road to Budget Terminal, Singapore Changi Airport

Clementi Mall

Up-Ramp to, and Down-Ramp from Terminal 2, Singapore Changi Airport

Up-ramp to and Down-ramp from Departure Hall, Terminal 3, Singapore Changi Airport

Taxiway Markings leading to/from Runways, Singapore Changi Airport

Taxi Stand at Arrival Hall, Terminal 2, Singapore Changi Airport

Sony @ 1 Tuas Road

Give Way to Bus Boxes at Selected Bus Stops at Ang Mo Kio and Bukit Batok

Container Parking Bay and Footpath at OCWS Logistics Pte. Ltd. (Tuas)

Departure Hall, Terminal 3, Singapore Changi Airport

Brani Gate 13, Port of Singapore Authority

Singapore Bus Services, Clementi Bus Interchange

Singapore Bus Services, Clementi Bus Interchange

Slip Road to Departure Hall, Terminal 3, Singapore Changi Airport

Airside Roadway Markings at Terminal 2 Baggage Area, Singapore Changi Airport

Fire Station 1, Singapore Changi Airport

Sentosa Cove North, Sentosa