Abstract
White topping is a popular road rehabilitation technique that uses Portland cement concrete overlay on top of any existing bituminous pavement. However, this often results in additional cost and carbon emission escalations which complicates market useability of the product. The current study aims at comparing carbon emission and manufacturing cost of concrete topping mixes with three different fibre types. The study optimises the benefits and promotes the use of effective materials in sustainable road rehabilitation. Samples with polyolefin-twisted (F2) fibres indicated least carbon emission escalation while the sample with polypropylene (F3) exhibited least cost escalation with 0.75% and 7.17% from the control sample respectively. A multi-objective genetic optimisation study was conducted to identify the mix designs with least carbon emission and production cost escalations. Sensitivity analysis illustrated that transport distance is a critical contributing factor for production cost while carbon emission is highly sensitive to emission factors for transport and cement production. These results indicate the importance of considering locally available materials and clean energy for production processes. Future research can be focused on exploring the long-term environmental and economic benefits including the durability characteristics to benchmark the sustainable benefits of using waste fibre materials in the mix.
Highlights
Published: 3 March 2022Road networks are a key connective infrastructure that facilitate social integration, transportation, trade and economic growth of city or region
National highway (NH) network is about 71,772 km, i.e., 1.7% of total road network and 40% of the total traffic is transported through the national highway network
Thin white topping is an overlay of concrete between 100 mm and 200 mm and in most of the cases are constructed with an intentional bond to the existing pavement
Summary
Road networks are a key connective infrastructure that facilitate social integration, transportation, trade and economic growth of city or region. As a country which use road infrastructure for 60% of total merchandise and 85% of total passenger traffic, India often oversees the importance of efficient management and maintenance of road network [2]. 200 mm in thickness and is constructed without considering the bond between the overlay and underlying pavement. Thin white topping is an overlay of concrete between 100 mm and 200 mm and in most of the cases are constructed with an intentional bond to the existing pavement. Ultra-thin white topping is an overlay of concrete with a thickness equal to or less than 100 mm that requires a bond to the underlying pavement for higher performance
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