Physical, Hydraulic, and Mechanical Properties of Clayey Soil Stabilized by Lightweight Alkali-Activated Slag Geopolymer: Fid-Bau Portal

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Physical, Hydraulic, and Mechanical Properties of Clayey Soil Stabilized by Lightweight Alkali-Activated Slag Geopolymer

Du, Yan-Jun / Yu, Bo-Wei / Liu, Kai / Jiang, Ning-Jun / Liu, Martin D.

Lightweight cement materials are extensively used in the infrastructure construction. Geopolymer is a low-carbon and environmentally friendly cementitious material. This paper presents an investigation on the physical, hydraulic, and mechanical characteristics of lightweight geopolymer stabilized soil (LGSS) and a comparison with lightweight cement stabilized soil (LCSS). Measurements of volumetric absorption ( $V A$ ) of water, hydraulic conductivity ( $k$ ), and unconfined compressive strength ( $q_{u}$ ), scanning electron microscope (SEM) observation, mercury intrusion porosimetry (MIP) test, and thermogravimetric analysis (TGA) are conducted. The results show that LGSS has higher $V A$ than LCSS. The $k$ of LGSS is one order of magnitude higher than that of LCSS. The $q_{u}$ of LGSS is 2–3.5 times of that of LCSS. Microstructurally, the $V A$ and $k$ of LGSS are found to be positively correlated with the volume of large air pores ( $> 10 μm$ ). Higher $q_{u}$ of LGSS than LCSS is attributed to more hydration products that fill up the voids of soil. It is concluded that LGSS gives better engineering performances than LCSS in terms of water absorption, permeability, and strength characteristics.

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Physical, Hydraulic, and Mechanical Properties of Clayey Soil Stabilized by Lightweight Alkali-Activated Slag Geopolymer

Du, Yan-Jun / Yu, Bo-Wei / Liu, Kai / Jiang, Ning-Jun / Liu, Martin D.

Lightweight cement materials are extensively used in the infrastructure construction. Geopolymer is a low-carbon and environmentally friendly cementitious material. This paper presents an investigation on the physical, hydraulic, and mechanical characteristics of lightweight geopolymer stabilized soil (LGSS) and a comparison with lightweight cement stabilized soil (LCSS). Measurements of volumetric absorption ( $V A$ ) of water, hydraulic conductivity ( $k$ ), and unconfined compressive strength ( $q_{u}$ ), scanning electron microscope (SEM) observation, mercury intrusion porosimetry (MIP) test, and thermogravimetric analysis (TGA) are conducted. The results show that LGSS has higher $V A$ than LCSS. The $k$ of LGSS is one order of magnitude higher than that of LCSS. The $q_{u}$ of LGSS is 2–3.5 times of that of LCSS. Microstructurally, the $V A$ and $k$ of LGSS are found to be positively correlated with the volume of large air pores ( $> 10 μm$ ). Higher $q_{u}$ of LGSS than LCSS is attributed to more hydration products that fill up the voids of soil. It is concluded that LGSS gives better engineering performances than LCSS in terms of water absorption, permeability, and strength characteristics.

Physical, Hydraulic, and Mechanical Properties of Clayey Soil Stabilized by Lightweight Alkali-Activated Slag Geopolymer

Du, Yan-Jun / Yu, Bo-Wei / Liu, Kai / Jiang, Ning-Jun / Liu, Martin D.

Lightweight cement materials are extensively used in the infrastructure construction. Geopolymer is a low-carbon and environmentally friendly cementitious material. This paper presents an investigation on the physical, hydraulic, and mechanical characteristics of lightweight geopolymer stabilized soil (LGSS) and a comparison with lightweight cement stabilized soil (LCSS). Measurements of volumetric absorption ( $V A$ ) of water, hydraulic conductivity ( $k$ ), and unconfined compressive strength ( $q_{u}$ ), scanning electron microscope (SEM) observation, mercury intrusion porosimetry (MIP) test, and thermogravimetric analysis (TGA) are conducted. The results show that LGSS has higher $V A$ than LCSS. The $k$ of LGSS is one order of magnitude higher than that of LCSS. The $q_{u}$ of LGSS is 2–3.5 times of that of LCSS. Microstructurally, the $V A$ and $k$ of LGSS are found to be positively correlated with the volume of large air pores ( $> 10 μm$ ). Higher $q_{u}$ of LGSS than LCSS is attributed to more hydration products that fill up the voids of soil. It is concluded that LGSS gives better engineering performances than LCSS in terms of water absorption, permeability, and strength characteristics.

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Title:

Physical, Hydraulic, and Mechanical Properties of Clayey Soil Stabilized by Lightweight Alkali-Activated Slag Geopolymer

Contributors:

Du, Yan-Jun (author) / Yu, Bo-Wei (author) / Liu, Kai (author) / Jiang, Ning-Jun (author) / Liu, Martin D. (author)

Published in:

Journal of Materials in Civil Engineering ; 29

Publication date:

2016-09-13

ISSN:

0899-1561 , 1943-5533

DOI:

https://doi.org/10.1061/(ASCE)MT.1943-5533.0001743

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

Unknown

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