SUSTAINABLE PAVEMENT DESIGN: DOING MORE WITH LESS
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1 SUSTAINABLE PAVEMENT DESIGN: DOING MORE WITH LESS Bob Wicklund, A.Sc.T., PMP, Regional Municipality of Halton Jason Miron, C.E.T., R.V. Anderson Associates Limited 1
2 Green Solutions Inherent environmental issues with traditional road rehabilitation methods: High resource and energy consumption Lengthy traffic interruptions Disruption to local community Halton Region s Green Procurement Policy The objective of this policy is to purchase environmentally preferred goods and services in which reasonable cost and lowering the impact on the environment and human health are key considerations 2
3 Green Solutions Three road re surfacing projects Steeles Avenue/Martin Street (18 lane kms), Trafalgar Road (9.2 lane kms), and Campbellville Road (8.6 lane kms) Forward thinking allowed the Region of Halton to realize improved environmental net benefits as well as cost savings 3
4 Location of Project 4
5 Green Solutions: Technologies Green Technologies Implemented Detailed pavement condition assessments undertaken at the planning stage found that innovative, green solutions could be used: Cold in place recycling with expanded asphalt mix (CIREAM) Stress absorbing membrane interlayer (SAMI) Pulverized asphalt Warm mix asphalt 5
6 Green Solutions Although these technologies are not new, the Ontario engineering and construction industry has been relatively slow to adopt their regular use, mostly due to general unfamiliarity and uncertainty about their historical track record 6
7 Green Solutions: Technologies Green Technologies Implemented Cold in place recycling with expanded asphalt mix (CIREAM) Utilized on Trafalgar Road Repairs aged pavements (thermal fatigued, or reflective cracking) and previously recycled pavements Mitigates reflective cracking Not suitable for pavements with extensive base or sub base problems, pavements containing steel slag, or pavements of insufficient strengths Ravelling can be an issue in high traffic areas until CIREAM is covered by a surface lift of asphalt 7
8 Green Solutions: Technologies Green Technologies Implemented Stress absorbing membrane interlayer (SAMI) Utilized on Steeles Avenue & Campbellville Road (15,000 m² placed) A combination of special polymer modified asphalt emulsion, chopped fibreglass strands, and aggregate (10 mm thickness) Highly resilient waterproof membrane that bridges alligator distressed pavements and delays reflective cracking 8
9 Green Solutions: Technologies Green Technologies Implemented Stress absorbing membrane interlayer (SAMI) Eliminates need for full depth pavement removal and replacement and only requires milling and replacement of top asphalt 9
10 Green Solutions: Technologies Green Technologies Implemented Pulverized asphalt Utilized on Campbellville Road Eliminates the need to haul a majority of material off site Increases road base thickness 10
11 Green Solutions: Technologies Green Technologies Implemented Warm mix asphalt 4000 tonnes placed on Trafalgar Road The technology allows asphalt pavement to be mixed and placed at lower temperatures 11
12 Green Solutions: Key Benefits Key benefits of green technologies: 1. Material re use and reduced resource consumption 2. Reduced energy consumption and carbon footprint 3. Minimizes social disruption 4. Increases worker safety during construction 5. Economical 12
13 Green Solutions: Sustainable Benefits 1. Material Re use and Reduced Resource Consumption CIREAM technology vs. full depth removal and replacement Eliminated the need to dispose of existing milled asphalt off site 13
14 Green Solutions: Sustainable Benefits 1. Material Re use and Reduced Resource Consumption SAMI technology vs. full depth removal and replacement Reduced asphalt removal and replacement by roughly 60 75% Eliminated need for 2,700 additional tonnes of asphalt replacement 14
15 Green Solutions: Sustainable Benefits 1. Material Re use and Reduced Resource Consumption Pulverized asphalt 6,300 tonnes of existing asphalt was pulverized and reused on Campbellville Road as granular base 15
16 Green Solutions: Sustainable Benefits 2. Reduced Carbon Footprint & Energy Consumption CIREAM technology vs. full depth asphalt removal and replacement Eliminated need to haul/dispose of milled asphalt off site Eliminated need for production, transport & placement of base asphalt 16
17 Green Solutions: Sustainable Benefits 2. Reduced Energy Consumption & Carbon Footprint SAMI technology vs. full depth asphalt removal and replacement Significant reduction in energy to remove additional existing asphalt Significant reduction in energy to produce, transport & place additional asphalt 17
18 Green Solutions: Sustainable Benefits 2. Reduced Energy Consumption & Carbon Footprint Pulverized asphalt vs. full depth asphalt removal and replacement Significant reduction in energy to transport milled asphalt off site Reduced energy consumption and emissions due to reduction of new material to be produced and transported 18
19 Green Solutions: Sustainable Benefits 2. Reduced Energy Consumption & Carbon Footprint Warm mix asphalt vs. hot mix asphalt Lower mix temperature, which cuts fuel consumption and decreases emissions 19
20 Green Solutions: Sustainable Benefits 3. Minimized Social Disruption CIREAM vs. full depth asphalt removal & replacement Reduced construction duration Reduced truck traffic Road opened to traffic shortly after placement of CIREAM 20
21 Green Solutions: Sustainable Benefits 3. Minimized Social Disruption SAMI & pulverized asphalt technology vs. full depth asphalt removal and replacement Reduced construction duration Reduced truck traffic Less traffic disruption Warm mix asphalt vs. hot mix asphalt Reduced emissions 21
22 Green Solutions: Sustainable Benefits 4. Increased Worker Safety during Construction CIREAM, SAMI, pulverized asphalt Reduced construction duration Pilot vehicle specified to control traffic speeds through construction area Warm mix asphalt Lower emissions and mix temperature creates a safer environment for workers 22
23 Green Solutions: Sustainable Benefits 5. Economical CIREAM (cold in place recycling with expanded asphalt mix) CIREAM on Trafalgar Road resulted in 40% lower construction costs than conventional re construction approach Estimated 30 year lifecycle cost, 30% lower than conventional reconstruction methods SAMI Cost is comparable to the removal & replacement of a 25 mm thickness of asphalt Pulverized asphalt ± 70% less expensive than full depth removal & replacement and offered the lowest lifecycle costs Warm mix Prices are marginally higher than hot mix asphalt 23
24 Green Solutions: Summary Select sustainable pavement designs that; Reduces resource consumption Reduces energy consumption and carbon footprint Minimizes social disruption Increases worker safety More economical than conventional methods 24
25 Green Solutions: Summary Let current road conditions and future road requirements dictate the technology selected. Try new technologies; See what works Don t be afraid Green technologies may be more economical than conventional methods for your projects 25
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