Carbon Footprint Analysis on the Expansive Soil Stabilization Techniques

Ashfaq, M. and Munwar Basha, B. et al. (2021) Carbon Footprint Analysis on the Expansive Soil Stabilization Techniques. In: IFCEE 2021, 10 May 2021 through 14 May 2021, Dallas.

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Expansive soils exhibit substantial swelling and shrinkage with the fluctuation in seasonal moisture content. Due to their widespread presence across the world, addressing the problems associated with their volume change has garnered global attention. Traditionally, chemical stabilization using additives like lime and cement was extensively adopted in addressing the swelling phenomenon of expansive soils. In recent times, the use of non-Traditional additives like ground-granulated blast-furnace slag (GGBS) in addressing the swelling and shrinkage of expansive has extensively been promoted as an economical alternative to existing calcium-based additives. Currently, the choice of stabilization technique is primarily driven by design and economic efficiency. However, efforts to quantify environmental impacts prior to the selection of stabilization are scarce. In the present study, carbon footprint analysis (CFA) was performed for lime stabilization, and it was compared with GGBS as an alternative stabilizer in borehole and ponding methods of in situ stabilization. Further, the CFA was also performed for an up-scaled scenario of stabilizing 1-million m2area. From the results, it was observed that the increase in the area of stabilization in the up-scaled scenario has resulted in exponentially rising in the overall emissions 7 × 105times. Further, it was observed that in in situ stabilization of expansive soils, emissions related to embodied carbon are relatively much higher than the haulage/procurement related emissions. From the results, it was inferred that irrespective of the type of additive and scale (volume/area) of stabilization, the application of borehole drilling method with GGBS as an additive could be a prudent practice with substantially lower CO2emissions compared to the ponding method.

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IITH Creators:
IITH CreatorsORCiD
Munwar Basha, B.
Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Chemical stabilization, Economic efficiency, Footprint analysis, Ground granulated blast furnace slag, Lime stabilization, Situ stabilization, Stabilization techniques, Swelling and shrinkages
Subjects: Civil Engineering
Divisions: Department of Civil Engineering
Depositing User: Mrs Haseena VKKM
Date Deposited: 23 Nov 2021 06:04
Last Modified: 23 Nov 2021 06:04
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