Abstract
| Language | English |
|---|---|
| Article number | 06017002 |
| Number of pages | 11 |
| Journal | ASCE Journal of Materials in Civil Engineering |
| Volume | 29 |
| Issue number | 6 |
| Early online date | 24 Jan 2017 |
| DOIs | |
| Status | Published - 1 Jun 2017 |
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Utilization of Alkali-Activated Olivine in Soil Stabilization and the Effect of Carbonation on Unconfined Compressive Strength and Microstructure. / Fasihnikoutalab, Mohammad Hamed; Asadi, Afshin; Unuler, Cise; Huat, Bujang Kim; Ball, Richard J.; Pourakbar, Saharam.
In: ASCE Journal of Materials in Civil Engineering, Vol. 29, No. 6, 06017002, 01.06.2017.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Utilization of Alkali-Activated Olivine in Soil Stabilization and the Effect of Carbonation on Unconfined Compressive Strength and Microstructure
AU - Fasihnikoutalab,Mohammad Hamed
AU - Asadi,Afshin
AU - Unuler,Cise
AU - Huat,Bujang Kim
AU - Ball,Richard J.
AU - Pourakbar,Saharam
PY - 2017/6/1
Y1 - 2017/6/1
N2 - This paper reports for the first time the stabilization of soil using olivine and the application of novel techniques utilizing alkaline activation and carbonation. A rigorous study addressed the effect of carbon dioxide pressure and alkali concentration (10-M sodium hydroxide soil additions from 5 to 20%) between 7 and 90 days. Microstructural and compositional changes were evaluated using microscopic, spectroscopic, and diffraction techniques. Results demonstrate the advantages of using olivine in the presence of NaOH and the associated increases insoil shear strength of up to 40% over 90 days. Samples subjected to carbonation for a further 7 days led to additional increases in soil strength of up to 60%. Microstructural investigations before and after carbonation attributed the strength development to the formation of Mg(OH)2, hydrated magnesium carbonates, and M─S─H, A─S─H gel phases. The impact of this work is far reaching and provides a new soil stabilization approach. Key advantages include significant improvements in soil strength with a lower carbon footprint compared with lime or cement stabilization.
AB - This paper reports for the first time the stabilization of soil using olivine and the application of novel techniques utilizing alkaline activation and carbonation. A rigorous study addressed the effect of carbon dioxide pressure and alkali concentration (10-M sodium hydroxide soil additions from 5 to 20%) between 7 and 90 days. Microstructural and compositional changes were evaluated using microscopic, spectroscopic, and diffraction techniques. Results demonstrate the advantages of using olivine in the presence of NaOH and the associated increases insoil shear strength of up to 40% over 90 days. Samples subjected to carbonation for a further 7 days led to additional increases in soil strength of up to 60%. Microstructural investigations before and after carbonation attributed the strength development to the formation of Mg(OH)2, hydrated magnesium carbonates, and M─S─H, A─S─H gel phases. The impact of this work is far reaching and provides a new soil stabilization approach. Key advantages include significant improvements in soil strength with a lower carbon footprint compared with lime or cement stabilization.
UR - http://ascelibrary.org/doi/abs/10.1061/(ASCE)MT.1943-5533.0001833
UR - http://dx.doi.org/10.1061/(ASCE)MT.1943-5533.0001833
U2 - 10.1061/(ASCE)MT.1943-5533.0001833
DO - 10.1061/(ASCE)MT.1943-5533.0001833
M3 - Article
VL - 29
JO - ASCE Journal of Materials in Civil Engineering
T2 - ASCE Journal of Materials in Civil Engineering
JF - ASCE Journal of Materials in Civil Engineering
SN - 0899-1561
IS - 6
M1 - 06017002
ER -