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Unsaturated Response of Clayey Soils Stabilised with Alkaline Cements

Title
Unsaturated Response of Clayey Soils Stabilised with Alkaline Cements
Type
Article in International Scientific Journal
Year
2020
Authors
Araújo, N
(Author)
Other
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Corrêa Silva, M
(Author)
Other
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Miranda, T
(Author)
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António Topa Gomes
(Author)
FEUP
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Castro, F
(Author)
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Teixeira, T
(Author)
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Cristelo, N
(Author)
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Journal
Title: MoleculesImported from Authenticus Search for Journal Publications
Vol. 25
Final page: 2533
ISSN: 1420-3049
Publisher: MDPI
Indexing
Other information
Authenticus ID: P-00S-9M8
Abstract (EN): The influence of suction on the mechanical behaviour of unsaturated chemically stabilised soils is still mostly unknown and unquantified. This is also motivated by the difficulties associated with the experimental procedure required to fully characterise the unsaturated response of the soil, including its direct influence on traditional strength tests. The present paper presents the soil water retention curves obtained for a Portuguese soil before and after being stabilised with Portland cement (OPC) and an alkali-activated cement (AAC). Saturated undrained triaxial tests were also performed for the same curing conditions (0, 28, and 90 days). Previous attempts to characterise the retention curve of soils stabilised with AAC are unknown, and the results showed that the pore volume structure is already formed after 28 days, prior to the full development of the gel matrix responsible for the strength increase between 28 and 90 days. The curve changed after stabilisation, and with each binder, as the OPC presented a higher air-entry value and a narrower suction range compared to the AAC solution. The significant differences between the curves obtained from each binder suggest the future development of a methodology to assess the quality of the AAC stabilisation.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 15
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