Analysis of Strength Development and Soil–Water Characteristics of Rice Husk Ash–Lime Stabilized Soft Soil
Abstract
:1. Introduction
2. Materials and Laboratory Tests
2.1. Materials
2.2. Test Design
2.3. Test Methods
2.3.1. Preparation of Specimens
2.3.2. Strength Test
2.3.3. Soil Water Characteristic Curve Test
2.3.4. Shear Strength Test
2.3.5. Methylene Blue Test
2.3.6. Microscopic Characteristic Test
3. Analysis of Characteristics of Strength Development
3.1. Effect of RHA on Unconfined Compressive Strength
3.2. Effect of RHA on Splitting Strength
4. Analysis of Soil–Water Characteristics
4.1. Effect of RHA on SWCC
4.2. The Change of Shear Strength with Water Content
4.3. Methylene Blue Test Analysis
5. Microscopic Tests Analysis
5.1. XRD Phase Analysis
5.2. SEM Test Analysis
6. Conclusion
- The RHA has a significant effect on the unconfined compressive strength and splitting strength of the lime-stabilized soil, of which the impact on the latter is greater. The optimum dosage of the RHA is 2%, 4%, and 6% when the lime content is 3%, 5%, and 7%, respectively.
- The RHA has a great influence on the soil–water characteristic curve of lime-stabilized soil. After adding RHA, the air entry value of the soil–water characteristic curve increases obviously, and the curve between the air entry value and residual water content is steeper. It demonstrates that the RHA makes the pore size distribution more uniform and the soil structure more compact.
- With the increase of the water content, the effective cohesion of the RHA–lime stabilized soil increases first and then decreases, which is always greater than that of lime-stabilized soil and soft soil. Especially in the state of high water content, the RHA can enhance the water stability of lime-stabilized soil.
- The results of the methylene blue test show that the incorporation of the RHA promotes the reduction of the specific surface area and swelling potential of lime-stabilized soil.
- Through the scanning electron microscope test, the mineral structure of the lime-stabilized soil changes from a thin acicular to form a more agglomerated columnar mixture when the RHA is added. As the curing time increases, the cementitious minerals in the RHA–lime stabilized soil increase continuously, and the overlap between them is more obvious.
- The microscopic test analyses reveal that the main reasons for strength increase and soil–water characteristics change with the addition of RHA are the enhanced cohesion by cementation and pore fillings with agglomerated minerals.
Author Contributions
Funding
Conflicts of Interest
References
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Soil Type | Liquid Limit, WL/% | Plastic Limit, WP/% | Plastic Index, IP | Optimum Moisture Content/% | Maximum Dry Density/ (g/cm3) |
---|---|---|---|---|---|
Silt clay | 38 | 19 | 19 | 18 | 1.798 |
Materials | SiO2 | CaO | Al2O3 | MgO | Others |
---|---|---|---|---|---|
Lime | - | 86.2 | - | 0.68 | - |
Rice husk ash | 88.09 | 0.98 | 1.25 | 0.34 | - |
Soft soil | 3000 | 2000 | 0.509 | 1.581 |
Lime soil | 3000 | 3059 | 0.589 | 1.192 |
RHA–lime soil | 3000 | 7980 | 0.787 | 1.241 |
Soil Sample | Vcc (mL) | MBV (g/100 g) | SSA (m2/g) |
---|---|---|---|
Soft soil | 37.00 | 1.23 | 30.17 |
Lime-stabilized soil | 32.00 | 1.07 | 26.10 |
RHA–lime stabilized soil | 29.00 | 0.97 | 23.65 |
MBV(g/100g) | Degree of Expansion |
---|---|
0–4 | Low |
4–8 | Medium |
8–15 | High |
>15 | Very high |
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Jiang, X.; Huang, Z.; Ma, F.; Luo, X. Analysis of Strength Development and Soil–Water Characteristics of Rice Husk Ash–Lime Stabilized Soft Soil. Materials 2019, 12, 3873. https://doi.org/10.3390/ma12233873
Jiang X, Huang Z, Ma F, Luo X. Analysis of Strength Development and Soil–Water Characteristics of Rice Husk Ash–Lime Stabilized Soft Soil. Materials. 2019; 12(23):3873. https://doi.org/10.3390/ma12233873
Chicago/Turabian StyleJiang, Xunli, Zhiyi Huang, Fuquan Ma, and Xue Luo. 2019. "Analysis of Strength Development and Soil–Water Characteristics of Rice Husk Ash–Lime Stabilized Soft Soil" Materials 12, no. 23: 3873. https://doi.org/10.3390/ma12233873