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Carbon Critical Design: Comparison of RE wall and RC viaduct on the Benz Circle Flyover, Andhra Pradesh
Adrian Anderson, General Manager Nehemiah Reinforced Soils (India) Pvt Ltd.
• Introduction• The design decision• The calculation• The results• Conclusion
Introduction
The design decision
The design decision
The calculation
Reinforced Concrete Viaduct (RC) Flyover
Reinforced Soil (RS) Wall Flyover
Tonnes of Material T CO2e/T Tonnes of material T CO2e/T
M20 Mass Concrete
24 T (Footings) 0.113 73T (Footings and anchor blocks)
0.113
M35 Reinforced Concrete
1014 T (Pre stressed beams 1.25% reinforcement by volume)
0.223 82 T (Facia panels - 0.48% reinforcement by volume)
0.121
M40 Reinforced concrete
643 (pre- stressed beams and crash barrier)
0.308 24 (crash barrier) 0.308
Compacted Aggregate
381 T 0.005 15,675 T 0.005
Steel (excluding concrete reinforcement)
48 T (Post Tensioned Cables)
2.830 14 T (soil reinforcing bars within backfill)
2.68
The Results
RS=0.36xRC
Conclusions
Move from Cost Critical to Carbon Critical Design
Informed Design
decisions
Simple calculation to make
Some local adaption required
Thank you
Adrian Anderson, General Manager Nehemiah Reinforced Soils (India) Pvt Ltd.