Important Sustainable Construction Materials and Technologies in India

India’s construction sector is adopting lower-impact materials and technologies to reduce emissions, waste and pressure on natural resources. These approaches can support resource efficiency and sustainable urbanisation while improving building performance.

Why Sustainable Construction Matters

• Construction contributes about 8% of India’s GDP and employs more than 40 million people, but it also has a substantial environmental footprint.
• Globally, the construction industry accounts for about 39% of greenhouse gas emissions. In India, building-sector material consumption reached 3,274 million tonnes in 2020, and associated emissions contributed 18% of annual greenhouse gas emissions.
• Construction-site dust contributes 18–20% of PM2.5 in some Indian cities, making dust management an important urban environmental concern.
• India generates an estimated 150 million tonnes of construction and demolition (C&D) waste annually. Concrete, bricks and masonry make up 70–80% of this waste; poor management can worsen air pollution and environmental degradation.

Reducing the use of virgin materials, reusing construction waste and improving building energy performance are central to making infrastructure greener.

Sustainable Construction Materials

• Bamboo: A rapidly renewable material, bamboo is strong and flexible, and can be used for scaffolding, reinforcement, walls, roofing and furniture. These properties make it relevant to construction in earthquake-prone areas. India contains approximately 45% of the world’s bamboo forests. The National Building Code of India (NBC), Part 6, Section 3, on timber and bamboo, advocates its use.
• Fly ash bricks and blocks: Made using fly ash, a coal-combustion by-product, with materials such as cement or lime, aggregates and water, these units can contain 35–80% fly ash by mass. They reduce industrial waste and demand for topsoil. They are generally lighter and stronger, with lower water absorption, than traditional clay bricks. Indian Standards include IS 12894 and IS 16720; common sizes include 190 × 90 × 90 mm (modular) and 230 × 110 × 75 mm (non-modular).
• Geopolymer concrete: This alternative to ordinary Portland cement (OPC) uses industrial by-products such as fly ash and ground granulated blast-furnace slag (GGBS), activated with an alkaline solution. Production can reduce CO₂ emissions by up to 80% compared with OPC. Uses include bridges, highways, marine structures, industrial flooring, precast work and buildings; the Delhi Metro Project has used it.
• Recycled C&D products: Processed concrete and masonry waste can become recycled aggregates, pavers, kerb blocks and lean concrete. Recycling 80–90% of C&D waste can reduce landfill demand, conserve natural resources and lower emissions.
• Compressed stabilised earth blocks and rammed earth: These use compacted, damp, screened soil, sometimes stabilised with a small quantity of cement or lime. They require less embodied energy in production and provide good thermal insulation.
• Hempcrete: Made from hemp hurds and lime, this biocomposite is valued for its insulation and carbon-negative potential.
• Recycled steel: Steel can be recycled repeatedly without losing its properties. Using recycled steel saves approximately 1.5 tonnes of CO₂ per tonne of steel produced.

Sustainable Construction Technologies

• Passive design: Building orientation, window placement, thermal mass, natural ventilation and shading can reduce reliance on mechanical heating and cooling. Passive design can lower cooling requirements by 40–50%.
• Rainwater harvesting: Including collection and storage systems from the design stage supports water conservation and sustainable site planning.
• Solar and renewable energy: Integrating solar panels and other renewable sources can improve energy efficiency and help buildings move towards net-zero operation.
• Building Information Modelling (BIM): This digital planning platform can improve resource management, optimise construction and reduce waste by up to 45%.
• Smart materials: Electrochromic glass changes transparency in response to sunlight, while photocatalytic cement can support self-cleaning surfaces. Such materials can improve energy efficiency and building performance.

Government Frameworks and Green Building

• Energy Conservation Building Code (ECBC): Sets energy-efficiency requirements for commercial building design.
• National Building Code (NBC) 2016: Includes provisions and recommendations on sustainable construction practices and materials, including bamboo.
• GRIHA: The Green Rating for Integrated Habitat Assessment is a national rating system developed by The Energy and Resources Institute (TERI). Its star-based assessment covers areas including site planning, energy efficiency and waste management.
• IGBC: The Indian Green Building Council, part of the Confederation of Indian Industry (CII), offers certifications adapted to Indian conditions, including Green Homes, Green Factories and Green Townships.
• LEED India: Leadership in Energy and Environmental Design, developed by the U.S. Green Building Council, is administered in India by Green Business Certification Inc. It emphasises energy and carbon-footprint reduction. India ranks third globally in LEED-certified buildings.
• Urban and financial measures: The Smart Cities Mission promotes eco-friendly urban planning, renewable energy and efficient resource use across more than 100 cities. Support measures described for green projects include fast-track environmental clearance, tax benefits, IREDA loans and state incentives such as additional Floor Area Ratio or subsidies for green-rated projects.

Together, these codes, rating systems and project-level measures link green infrastructure with more resource-efficient urban development.

Key Prelims Takeaways

• India’s construction sector is economically significant but contributes to emissions, air pollution and large volumes of C&D waste.
• Bamboo is renewable, strong and flexible; its use is supported by provisions in NBC 2016.
• Fly ash bricks use an industrial by-product and are covered by standards including IS 12894 and IS 16720.
• Geopolymer concrete uses industrial by-products as an alternative binder and can reduce production emissions compared with OPC.
• Passive design, rainwater harvesting, renewable energy, BIM and smart materials are key sustainable building approaches.
• ECBC, NBC, GRIHA, IGBC and LEED are important codes or frameworks associated with green construction in India.

Recent Context

IIT Kanpur researchers developed underground bamboo-filled barriers to screen ground-borne vibrations. The patent, “A passive vibration screening arrangement with bamboo in-filled wave barriers” (No. 436990), was granted on 3 July 2023. The technology is available for licensing; its suitability depends on ground conditions and vibration characteristics.