Stabilisation of black cotton soil for subgrade application using fly ash geopolymer

Stabilisation of black cotton soil for subgrade application using fly ash geopolymer

It is a common practice around the world to stabilise black cotton soil using lime or cement to improve the strength of stabilised sub-base and subgrade soil. However, production of cement and lime is highly energy intensive. It is also reported to emit large quantity of CO 2 into the atmosphere. Mo...

Full description

Saved in:
Bibliographic Details
Published in:Road materials and pavement design Vol. 21; no. 3; pp. 867 - 885
Main Authors: Murmu, Anant Lal, Dhole, Nupur, Patel, Anjan
Format: Journal Article
Language:English
Published: Abingdon Taylor & Francis 02-04-2020
Lavoisier
Subjects:
black cotton soil
California bearing ratio
CBR
Cement
Compressive strength
Cotton
Emissions control
Feasibility studies
Fly ash
geopolymer
Greenhouse effect
Greenhouse gases
Lime soil stabilization
Microstructural analysis
Penetration tests
Soil investigations
Soil lime
Soil stabilization
Soils
Spectrum analysis
stabilisation
subgrade
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:It is a common practice around the world to stabilise black cotton soil using lime or cement to improve the strength of stabilised sub-base and subgrade soil. However, production of cement and lime is highly energy intensive. It is also reported to emit large quantity of CO 2 into the atmosphere. Moreover, the global warming potential of fly ash (0.00526-0.027 kg CO 2 eq/kg) being a waste, is very low as compared to that of cement (0.82-0.948 kg CO 2 eq/kg) and lime (about 0.416 kg CO 2 eq/kg). Thus, in order to reduce the emission of greenhouse gases associated with lime and cement stabilisation, an experimental investigation is conducted to study the feasibility of using fly ash geopolymer to stabilise black cotton soil. The experimental investigation was carried out by varying fly ash content from 5% to 20% and treating the samples with a lower concentration of 5M NaOH solution. Tests were conducted in the laboratory to obtain the unconfined compressive strength and California bearing ratio and resilient modulus values of the stabilised samples. Moreover, microstructural analysis using X-ray diffraction, scanning electron microscope, energy dispersive spectroscopy and Fourier transformed infrared spectroscopy were conducted to see insight into the material behaviour. It is concluded from the present study that the fly ash-based geopolymer could be used for stabilisation of black cotton soil for highway subgrade and sub-base preparation.
ISSN:1468-0629
2164-7402
DOI:10.1080/14680629.2018.1530131