Journal
MOLECULES
Volume 25, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/molecules25112533
Keywords
sustainable cement; alkaline activation; soil stabilisation; unsaturated soils; retention curves
Funding
- project Geo-Design-Artifacts for hotels and urban furniture incorporating waste project [NORTE-01-0247-FEDER-017501]
- European Regional Development Fund (ERDF) through NORTE 2020 (North Regional Operational Program 2014/2020)
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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.
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