BACKGROUND
- Bulk fly ash utilization initiative
- Presently, NTPC generates around 60 million tons of coal ash annually from its coal based thermal power plants with an ash utilization of 53.65 %. There is a growing need to achieve the target of mandatory 100% utilization of fly ash over a specified time span as per Gazette Notification issued by MOEF, GoI
POSSIBLE SOLUTION:
- Geopolymer concrete, eco-friendly construction material, has emerged as important engineering materials in recent times because of its utility in developing ecologically sound and sustainable construction materials. It will contribute not only to enhance fly ash utilisation but also producing valuable carbon off-set credits.
SHORTLISTED SOLUTIONS:
- Construction of M40 grade trial patch of 50-meter single land and 100-meter double lane at CBRI Roorkee and NTPC Dadri respectively.
- IRC accreditation – Findings of the study were presented before Highway Research Board of Indian Road Congress(IRC) and IRC accreditation has been granted. IRC has accredited ‘Geopolymer concrete’ for road construction developed by NETRA – NTPC Ltd. On dt 05.01.2018.
Tangible/Intangible Benefits:
- Fly ash utilisation 1000 Mt per Km of road.
- 0.12Km of road can be constructed per MW of electricity generated.
- NO CEMENT - Developed Fly ash based green concrete road without cement with M 40 strength
- NO WATER CURING - Construction of fly ash based GPC road without water curing.
- Bulk utilization of Fly Ash
- Negligible CO2 emission in comparison to high CO2
- High early compressive strength -Strength is achieved in 7 days in comparison to 28 days for normal Concrete road.
- Negligible shrinkage – No cracks observed in GPC road
- Low permeability - Monolithic
- Good durability in aggressive environment compared to conventional concrete road
- Low thermal conductivity