Stabilization of a Residual Soil Using Calcium and Magnesium Hydroxide Nanoparticles: A Quick Precipitation Method
Abstract
:1. Introduction
2. Materials and Methodology
2.1. Residual Soil
2.2. Soil Sample Preparation
2.3. Nanoparticles Preparation
2.4. Geotechnical Tests
2.4.1. Particle Size Distribution, Atterberg Limits, and Specific Gravity
2.4.2. Standard Proctor Compaction
2.4.3. Hydraulic Conductivity
2.4.4. Unconfined Compressive Strength (UCS)
2.5. Microstructural Tests
2.5.1. X-ray Diffraction (XRD)
2.5.2. Variable-Pressure Scanning Electron Microscope (VP-SEM) and Energy-Dispersive X-ray Spectroscopy (EDX)
2.6. Statistical Analysis
3. Results and Discussions
3.1. Effect of Nanoparticles on Atterberg Limits
3.2. Effect of Nanoparticles on Compaction Characteristics
3.3. Effect of Nanoparticles on Hydraulic Conductivity
3.4. Effect of Nanoparticles on Unconfined Compressive Strength (UCS)
3.5. Effect of Nanoparticles on Microstructural Properties
3.5.1. X-ray Diffraction (XRD)
3.5.2. Variable Pressure Scanning Electron Microscope (VP-SEM)
3.5.3. Energy-Dispersive X-ray Spectroscopy (EDX)
4. Conclusions
- The Atterberg limits of both treated soil samples reduced as a result of decreased DDL thickness. The change in the Atterberg limits caused a transition in soil plasticity classification from high plasticity clay (CH) to intermediate plasticity clay (CI).
- Calcium hydroxide and magnesium hydroxide nanoparticles showed different effects on the compaction characteristics of the treated soil samples. The MDD of CS decreased with increased OMC due to the pozzolanic reactions between the soil and calcium ions. The compaction characteristics of MS portrayed a different trend whereby their MDD decreased with increased OMC as a result of reduced DDL thickness.
- The hydraulic conductivity of calcium and magnesium hydroxide nanoparticles-treated samples reduced significantly with permeation time. This is probably due to the clogging of soil pores by the cementing gels formed. These phenomena retarded the movement of water along the compacted soil matrix and resulted in lower hydraulic conductivity.
- The UCS of nanoparticles-treated samples increased with increasing curing time due to enhanced interlocking between the soil particles. It is quite likely that the flocculation of soil particles and the formation of cementing gels enhanced the bonding of the soil particles and gave rise to a denser soil structure.
- The appearance of denser and compacted soil structure as shown in the VP-SEM images of CS and MS justified the explanation of the reduced hydraulic conductivity and increased UCS of treated soil samples. In addition, the formation of new cementing gels such as calcium silicate hydrate, calcium aluminate hydrate, magnesium silicate hydrate, and magnesium aluminate hydrate, which act as soil binders, were observed from the XRD analysis of treated soil samples.
Author Contributions
Funding
Conflicts of Interest
Nomenclature
C-A-H | calcium aluminate hydrates |
CS | calcium hydroxide treated soil |
C-S-H | calcium silicate hydrates |
DDL | diffuse double layer |
EDX | energy-dispersive x-ray spectroscopy |
M-A-H | magnesium aluminate hydrate |
MS | magnesium hydroxide treated soil |
M-S-H | magnesium silicate hydrate |
MDD | maximum dry density |
NS | natural soil |
OMC | optimum moisture content |
UCS | unconfined compressive strength |
VP-SEM | variable-pressure scanning electron microscope |
XRD | X-ray diffraction |
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Property | Natural Soil (NS) | Calcium Hydroxide Treated Soil (CS) | Magnesium Hydroxide Treated Soil (MS) |
---|---|---|---|
Liquid limit (%) | 50.10 | 46.00 | 41 |
Plastic limit (%) | 21.80 | 20.35 | 19.65 |
Plasticity index (%) | 28.30 | 23.85 | 21.35 |
British Standard (BS) Soil Classification System | CH | CI | CI |
Source of Variation | Sum of Squares | Degrees of Freedom | Mean Square | F Value | p Value |
---|---|---|---|---|---|
Treatment | 40,656.06 | 2 | 20,328.03 | 20.79 | 0.00201 |
Error | 5866.42 | 6 | 977.74 | ||
Total | 46,522.48 | 8 |
Comparison between Treatment Methods | Mean Difference | Standard Error of Mean | t Value | Alpha | Significant |
---|---|---|---|---|---|
Calcium hydroxide treated soil (CS) vs. natural soil (NS) | 156.20 | 25.53 | 6.12 | 0.05 | Yes |
Magnesium hydroxide treated soil (MS) vs. natural soil (NS) | 123.15 | 25.53 | 4.82 | 0.05 | Yes |
Elements | Natural Soil, NS (%) | Calcium Hydroxide Treated Soil, CS (%) | Magnesium Hydroxide Treated Soil, MS (%) |
---|---|---|---|
C | 10.74 | 11.96 | 10.23 |
O | 61.91 | 61.20 | 59.67 |
Al | 10.34 | 9.71 | 10.50 |
Si | 12.85 | 11.41 | 12.61 |
Fe | 1.09 | 1.12 | 3.40 |
Pt | 3.08 | 3.01 | 2.56 |
Ca | - | 1.01 | - |
Mg | - | - | 0.46 |
Na | - | 0.25 | 0.25 |
Cl | - | 0.32 | 0.32 |
Al/Si | 0.80 | 0.85 | 0.83 |
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Yong, L.L.; Namal Jayasanka Perera, S.V.A.D.; Syamsir, A.; Emmanuel, E.; Paul, S.C.; Anggraini, V. Stabilization of a Residual Soil Using Calcium and Magnesium Hydroxide Nanoparticles: A Quick Precipitation Method. Appl. Sci. 2019, 9, 4325. https://doi.org/10.3390/app9204325
Yong LL, Namal Jayasanka Perera SVAD, Syamsir A, Emmanuel E, Paul SC, Anggraini V. Stabilization of a Residual Soil Using Calcium and Magnesium Hydroxide Nanoparticles: A Quick Precipitation Method. Applied Sciences. 2019; 9(20):4325. https://doi.org/10.3390/app9204325
Chicago/Turabian StyleYong, Lee Li, S.V.A.D. Namal Jayasanka Perera, Agusril Syamsir, Endene Emmanuel, Suvash Chandra Paul, and Vivi Anggraini. 2019. "Stabilization of a Residual Soil Using Calcium and Magnesium Hydroxide Nanoparticles: A Quick Precipitation Method" Applied Sciences 9, no. 20: 4325. https://doi.org/10.3390/app9204325
APA StyleYong, L. L., Namal Jayasanka Perera, S. V. A. D., Syamsir, A., Emmanuel, E., Paul, S. C., & Anggraini, V. (2019). Stabilization of a Residual Soil Using Calcium and Magnesium Hydroxide Nanoparticles: A Quick Precipitation Method. Applied Sciences, 9(20), 4325. https://doi.org/10.3390/app9204325