WASTE PLASTIC BAGS in

ASPHALT CONCRETE

Josefina R. CeloricoMSD-ITDI-DOST

Technical Briefing on Plastics and EnvironmentCentury Park Hotel, Manila

July 25, 2008

OUTLINE

OVERVIEW PROPERTIES APPLICATION SUMMARY

Waste Utilization ITDI R&Ds initiatives

Bioreactor Biogas Recycling of laminates Styro-plastic melting densifier Waste plastic bags in asphalt concrete

Asphalt concrete Common materials for road construction Consists of aggregates and asphalt Aggregates : fine and coarse Asphalt

bituminous material obtained from petroleum processing binds aggregate in asphalt concrete

Use of waste and industrial products rubber tires

Waste plastic bags in asphalt concrete

Consists of aggregates and asphalt with waste plastic bags Constructing new road pavements Resurfacing of road pavements (repair of potholes)

Properties

Tests Marshall Mix Design

Determines the optimum mix of asphalt and aggregates suitable for road pavement

Immersion Compression Strength Determines retained strength after immersion in

water for 4 days at 50ºC Skid resistance

Determines durability of asphalt concrete

Marshall Method Mix Criteria

Heavy TrafficSurface and BaseMin Max

Asphalt concrete with waste plastic

bagsCompaction, no. of blows each end of specimens

75

75

Stability, lb 1800 - 3875

Marshall stability

Control(Asphalt concrete)

Dry Wet

Asphalt concrete with waste plastic bags

Dry WetBulk specific gravity

2.425 2.410 2.403 2.402

Stability,Kpa 2742 1981 2754 2081

Index of retained strength,%(minimum = 70) 70.44

75.45

Immersion Compression Strength

Skid Resistance Minimum skid resistance value (SRV)

55 SRV (Motorways, Trunk, and class 1 and heavily trafficked road carrying more than 2000 vehicles/day

Control (asphalt concrete) = 90 SRV Asphalt concrete with waste plastic bags

= 102 SRV

APPLICATION

Repair of Potholes

MSD bldg 6 potholes August 2007 8.0 kg waste plastic bags

STD bldg 6 potholes June 2008 6.0 kg waste plastic bags

Equipment Plastic Shredder Asphalt and waste plastic bags mixer Aggregate and asphalt with waste plastic

bags mixer Concrete cutter Compactor

Shredding of waste plastic bags

Asphalt

Asphalt with waste plastic bags

Blending/Mixing

Shredded waste plastic bags

Mixing

Asphalt with waste plastic bags Aggregates

Asphalt concrete with waste plastic bags

SUMMARY

Potential of utilizing waste plastic bags in road pavement

Asphalt concrete with waste plastic bags is economically, technically and environmentally viable