Stabilisation of lithomargic clay using alkali activated fly ash and ground granulated blast furnace slag

Stabilisation of lithomargic clay using alkali activated fly ash and ground granulated blast furnace slag

A suitable ground improvement technique is essential in order to confront the problems associated with lithomargic clay for road construction. The efficacy of alkaline solutions such as sodium hydroxide and sodium silicate along with class F fly ash and Ground Granulated Blast Furnace Slag (GGBS) as...

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Bibliographic Details
Published in:The international journal of pavement engineering Vol. 21; no. 9; pp. 1114 - 1121
Main Authors: Amulya, S., Ravi Shankar, A. U., Praveen, Medari
Format: Journal Article
Language:English
Published: Abingdon Taylor & Francis 28-07-2020
Taylor & Francis LLC
Subjects:
Activated clay
Additives
Alkali activation
Blast furnace practice
California bearing ratio
Clay
Compressive strength
Dosage
Dry density
Durability
Fly ash
GGBS
Granulation
ground granulated blast furnace slag
lithomargic clay
Mixtures
Penetration tests
Road construction
Sodium
Sodium hydroxide
Sodium silicates
Soils
stabilisation
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Summary:A suitable ground improvement technique is essential in order to confront the problems associated with lithomargic clay for road construction. The efficacy of alkaline solutions such as sodium hydroxide and sodium silicate along with class F fly ash and Ground Granulated Blast Furnace Slag (GGBS) as additives to improve the properties of lithomargic clay is examined. The different mixes are prepared by replacing the soil with 20%, 30%, and 40% of GGBS and fly ash. The Maximum Dry Density (MDD) obtained from the soil replaced with 40% GGBS and for the soil replaced with 30% fly ash. An activator modulus of 1.25 is kept constant for the varying sodium oxide dosage at 2, 3 and 4 per cent. The Unconfined Compressive Strength (UCS) of the alkali-activated soil cured for 3, 7 and 28 days is determined and compared with the UCS of the soil replaced with fly ash and GGBS at both standard and modified proctor densities. The different mixes are tested for the durability, California Bearing Ratio (CBR). The soil is replaced with GGBS and fly ash does not pass the durability test while the alkali-activated mixes with 4% sodium oxide dosage is found to be durable.
ISSN:1029-8436
1477-268X
DOI:10.1080/10298436.2018.1521520