Sulphate soil stabilisation with magnesium binders for road subgrade construction

This paper analyzes the ability of magnesium oxide-based additives to stabilise a low bearing gypsum marly soil, in order to reach subgrade requirements. This soil was not adequate for stabilisation with lime or cement because of its high sulphate content. Binders considered in this investigation we...

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Bibliographic Details
Published in:The international journal of pavement engineering 2022-05, Vol.23 (6), p.1840-1850
Main Authors: Seco, A., del Castillo, J.M., Espuelas, S., Marcelino, S., García, B.
Format: Article
Language:English
Subjects:
Additives
Bearing capacity
Calcium chloride
Cements
engineering properties
GGBS
Granulation
Gypsum
Gypsum marly soil
Laboratories
Laboratory tests
Leaching
Lime soil stabilization
Magnesium oxide
Soil lime
soil stabilisation
Soil stabilization
Soil swelling
subgrade
sulphate
Superconductors (materials)
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Summary:This paper analyzes the ability of magnesium oxide-based additives to stabilise a low bearing gypsum marly soil, in order to reach subgrade requirements. This soil was not adequate for stabilisation with lime or cement because of its high sulphate content. Binders considered in this investigation were composed of three reactive Mg products and by products, both with and without ground granulated blast furnace slags (GGBS). They were compared to two cements and an aerial lime as soil stabilisers in a laboratory investigation and a field trial. Laboratory tests showed that Mg products with GGBS reached strength results close and at times even better than those of cement. One of the Mg products was the only additive able to reduce the natural soil swelling. Leaching tests demonstrated the ability of the Mg products to reduce the soil leaching of substances like calcium, magnesium, sulphate and chloride. In field trials two of the Mg products combined with GGBS met the bearing capacity requirements for subgrades, in accordance with the Spanish standard.
ISSN:1029-8436
1477-268X
DOI:10.1080/10298436.2020.1825711