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diverse applications of these Infrastructure waste materials and lowering the overall
waste materials can showcase carbon footprint of road projects.
the potential to reduce Waste materials from This approach not only minimizes
environmental impact while infrastructure projects, including waste but also supports a circular
construction and demolition
maintaining the structural (C&D) waste and recycled asphalt economy, where materials are
integrity of highways. pavement (RAP), are valuable reused rather than discarded.

Research work is being carried resources in road construction. C&D CRRI is actively working to
out by number of academic waste, composed of materials such incorporate the maximum amount
institutes, along with CSIR-CRRI in as concrete, bricks, and metals, is of RAP and C&D waste in road
construction through pilot studies.
both lab and field applications to often crushed and reused in base This approach not only minimizes
utilize the industrial waste. and sub-base layers, providing waste but also supports a circular
a stable foundation for roads.
Potential of Industrial waste/ Recycled asphalt, sourced from economy, where materials are
marginal local materials for old pavements, is processed and reused rather than discarded.
highway construction (SUSTRANS reincorporated into new asphalt
SOAR Report, 2017, CRRI). layers, reducing the need for virgin Agriculture/Bio Waste
Agricultural waste materials
Type of waste Source Possible usage like rice straw, pine needles, and
Steel slag Steel industry Base/ Sub-base material, bituminous and bio bitumen offer innovative
concrete mix solutions for sustainable road

Ferro chrome slag Ferro Alloy Base/ Sub-base material, bituminous and construction. Rice straw, typically
Industry concrete mix burned as a disposal method, can
be processed into bio bitumen, an
Coal ash Thermal Coal ash Embankment, filler in bituminous
power station mix, artificial aggregates eco-friendly binder that replaces
conventional bitumen in asphalt
Blast furnace slag Steel industry Base/ Sub-base material, bituminous and mixes. Pine needles, another
concrete mix
form of agricultural residue, are
Construction and Construction Base/ Sub-base material, embankment, being explored for their potential
demolition waste industry recycling in composite materials for road

Spent oil shale Petrochemical Embankment construction. These waste
industry materials provide a renewable
Colliery spoil Coal mining Embankment alternative to traditional resources,
reducing dependency on fossil
Copper slag Copper Embankment, Sub base / base / bituminous fuels and contributing to a more
industry / concrete mixes
sustainable construction industry.
Zinc slag Zinc industry Embankment, Sub base / base / bituminous
/ concrete mixes Municipal Waste
Jarofix Aluminum Embankment
industry Plastic waste, which poses
a significant environmental
Foundry sands Foundry Embankment, filler for concrete, crack-relief challenge, can be used to enhance
industry layer
the flexibility and durability of
Cement kiln dust Cement Stabilization of base, binder in bituminous bitumen in asphalt layers. E-waste,
industry mix containing valuable metals and
Marble dust Marble Granular base/sub-base, aggregates in materials, is being recycled and
industry bituminous mix, embankment integrated into construction
Waste tyres Automobile Rubber modfied bitumen, aggregate materials reducing the burden on
industry landfills and resource extraction.
MSW, when properly processed,
Fly ash Thermal Embankment, Base/ Sub-base material,
Power Plant bituminous and concrete mix can be utilized as a filler material
in road construction, turning
Glass waste Glass industry Glass-fibre reinforcement, embankment waste into a valuable resource.

20 TRAFFICINFRATECH / August-September 2024 / www.trafficinfratech.com