Unsaturated Response of Clayey Soils Stabilised with Alkaline Cements
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, includi...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-05-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/25/11/2533 |
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| author | Nuno Araújo Manuela Corrêa-Silva Tiago Miranda António Topa Gomes Fernando Castro Tiago Teixeira Nuno Cristelo |
| author_facet | Nuno Araújo Manuela Corrêa-Silva Tiago Miranda António Topa Gomes Fernando Castro Tiago Teixeira Nuno Cristelo |
| author_sort | Nuno Araújo |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-10T19:30:21Z |
| format | Article |
| id | doaj.art-208f7978843f4646b0bc4f17ad7aa77f |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-10T19:30:21Z |
| publishDate | 2020-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-208f7978843f4646b0bc4f17ad7aa77f2023-11-20T02:10:30ZengMDPI AGMolecules1420-30492020-05-012511253310.3390/molecules25112533Unsaturated Response of Clayey Soils Stabilised with Alkaline CementsNuno Araújo0Manuela Corrêa-Silva1Tiago Miranda2António Topa Gomes3Fernando Castro4Tiago Teixeira5Nuno Cristelo6ISISE, Department of Civil Engineering, University of Minho, 4800-058 Guimarães, PortugalDepartment of Civil Engineering, University of Minho, 4800-058 Guimarães, PortugalInstitute of Science and Innovation for Bio-Sustainability (IB-S), Department of Civil Engineering, University of Minho, 4800-058 Guimarães, PortugalCONSTRUCT, Department of Civil Engineering, University of Porto, 4200-465 Porto, PortugalMEtRICs, Department of Mechanical Engineering, University of Minho, 4800-058 Guimarães, PortugalW2V, Rua das Alminhas 900, 4810-608 Guimarães, PortugalCQ-VR, Department of Engineering, University of Trás-os-Montes e Alto Douro, 5001-801 Vila Real, PortugalThe 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.https://www.mdpi.com/1420-3049/25/11/2533sustainable cementalkaline activationsoil stabilisationunsaturated soilsretention curves |
| spellingShingle | Nuno Araújo Manuela Corrêa-Silva Tiago Miranda António Topa Gomes Fernando Castro Tiago Teixeira Nuno Cristelo Unsaturated Response of Clayey Soils Stabilised with Alkaline Cements Molecules sustainable cement alkaline activation soil stabilisation unsaturated soils retention curves |
| title | Unsaturated Response of Clayey Soils Stabilised with Alkaline Cements |
| title_full | Unsaturated Response of Clayey Soils Stabilised with Alkaline Cements |
| title_fullStr | Unsaturated Response of Clayey Soils Stabilised with Alkaline Cements |
| title_full_unstemmed | Unsaturated Response of Clayey Soils Stabilised with Alkaline Cements |
| title_short | Unsaturated Response of Clayey Soils Stabilised with Alkaline Cements |
| title_sort | unsaturated response of clayey soils stabilised with alkaline cements |
| topic | sustainable cement alkaline activation soil stabilisation unsaturated soils retention curves |
| url | https://www.mdpi.com/1420-3049/25/11/2533 |
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