Investigation of Water-Stability Behaviors in Coastal Mud Multiply Modified by Cement and Coarse-Particle Spoil
Abstract
1. Introduction
2. Overview of Study Area
3. Experimental Materials and Methods
3.1. Experimental Materials
3.2. Test Method
3.2.1. Unconfined Compression Strength Test
3.2.2. Water Stability Test
3.2.3. Microstructure Analysis
4. Results and Discussions
4.1. Unconfined Compression Strength
4.2. Water-Stability Coefficient
4.3. Microstructure Analyses of Modified Soil
4.3.1. Microstructure and Morphology Analyses
4.3.2. Microscopic Component Analyses
5. Conclusions
- The unconfined compressive strength (UCS) of cement-stabilized soil is governed by the interactive effects of cement dosage, coarse-grained fraction and curing time. At a low cement content (5%), UCS decreases monotonically with increasing coarse-particle content for any given curing period. When the cement content is raised to an intermediate level (10%), the influence of the coarse fraction becomes negligible; instead, strength clusters narrowly around 1.2 MPa at 7 d and 2.0 MPa at 28 d regardless of the coarse-grained proportion. At a high cement content (15%), UCS exhibits a positive linear correlation with coarse-particle content. A maximum strength is attained when the coarse-grained fraction reaches 60% by mass, yielding peak UCS values of 2.02 MPa at 7 d and 3.61 MPa at 28 d.
- The UCS of the cement-modified soil after immersion is consistently lower than its pre-immersion value at both 7 d and 28 d. At 7 d, the blend containing 60% coarse-grained soil exhibits the highest water-stability coefficient under all three cement levels, peaking at 0.862 for the 4:6 aggregate/cement ratio with 5% cement. After 28 d of curing, the same 60% coarse-grained fraction again produces the greatest water-stability coefficient among the four granular contents, corroborating the 7 d trend and reaching a maximum of 0.774 at the 4:6 ratio with 10% cement. To enhance the stability of soil properties, a mix proportion of 60% coarse-grained soil combined with 15% cement is recommended; conversely, for scenarios in which cost-effectiveness is the primary concern, a blend comprising 60% or 50% coarse-grained soil and 10% cement may be adopted.
- Microstructural and compositional analyses demonstrate that inter-particle voids progressively diminish and crack apertures narrow as the curing period is extended. Coarse grains function as a rigid skeleton, while the ongoing cement-hydration reaction densifies the matrix. Hydration products, predominantly colloidal oxides, form extensive bonding networks, markedly enhancing both strength and water stability. Consequently, the synergistic modification of coastal mucky soil with cement and coarse-grained waste not only upgrades its physico-mechanical performance but also provides a high-volume outlet for engineering spoil. These findings furnish a robust theoretical framework for the stabilization of soft coastal deposits and the sustainable management of coarse-grained construction by-products.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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| Soil Type | Water Content/% | Unit Weight /(kN/m3) | Organic Matter/% | Liquid Limit/% | Plastic Limit/% | Plasticity Index/% | Internal Friction Angle/° | Cohesion/kPa | Permeability Coefficient/(cm/s) | Density/(g/cm3) |
|---|---|---|---|---|---|---|---|---|---|---|
| Mucky soil | 56.72 | 16.2 | 5.71 | 48.72 | 25.31 | 23.41 | 6.9 | 8.3 | 5.61 × 10−7 | 1.76 |
| Parameter | Specific Surface Area/(m2/kg) | C3S/% | C2S/% | C3A/% | C4AF/% |
|---|---|---|---|---|---|
| Value | 342 | 53 | 22 | 10 | 15 |
| No. | Mucky Soil /% | Coarse-Grained Soil /% | Curing Agent /% | Dry Density /(g/cm3) | Water Content /% | Curing Age /d |
|---|---|---|---|---|---|---|
| Mix1 | 40 | 60 | 5 | 1.46 | 30 | 7/28 |
| Mix2 | 40 | 60 | 10 | 1.46 | 30 | 7/28 |
| Mix3 | 40 | 60 | 15 | 1.46 | 30 | 7/28 |
| Mix4 | 50 | 50 | 5 | 1.46 | 30 | 7/28 |
| Mix5 | 50 | 50 | 10 | 1.46 | 30 | 7/28 |
| Mix6 | 50 | 50 | 15 | 1.46 | 30 | 7/28 |
| Mix7 | 60 | 40 | 5 | 1.46 | 30 | 7/28 |
| Mix8 | 60 | 40 | 10 | 1.46 | 30 | 7/28 |
| Mix9 | 60 | 40 | 15 | 1.46 | 30 | 7/28 |
| Mix10 | 70 | 30 | 5 | 1.46 | 30 | 7/28 |
| Mix11 | 70 | 30 | 10 | 1.46 | 30 | 7/28 |
| Mix12 | 70 | 30 | 15 | 1.46 | 30 | 7/28 |
| No. | UCS After Immersion/kPa | UCS Without Immersion/kPa | Water-Stability Coefficient/% |
|---|---|---|---|
| Mix1 | 276.91 | 500.56 | 55.53 |
| Mix2 | 809.30 | 1265.88 | 63.93 |
| Mix3 | 1581.92 | 2024.96 | 78.12 |
| Mix4 | 270.05 | 455.89 | 59.24 |
| Mix5 | 767.30 | 1114.88 | 68.82 |
| Mix6 | 1430.34 | 1956.00 | 73.13 |
| Mix7 | 307.32 | 585.32 | 52.51 |
| Mix8 | 688.66 | 1240.28 | 55.52 |
| Mix9 | 1125.47 | 1610.04 | 69.90 |
| Mix10 | 300.54 | 597.41 | 50.31 |
| Mix11 | 696.93 | 1147.62 | 60.73 |
| Mix12 | 1131.31 | 1804.20 | 62.70 |
| No. | UCS After Immersion/kPa | UCS Without Immersion/kPa | Water-Stability Coefficient/% |
|---|---|---|---|
| Mix1 | 415.11 | 740.23 | 56.08 |
| Mix2 | 1574.03 | 2034.81 | 77.36 |
| Mix3 | 2555.24 | 3606.63 | 70.85 |
| Mix4 | 382.51 | 1024.29 | 37.34 |
| Mix5 | 1073.91 | 1910.36 | 56.21 |
| Mix6 | 1971.30 | 3089.94 | 63.80 |
| Mix7 | 393.04 | 1013.52 | 38.78 |
| Mix8 | 1102.00 | 2083.01 | 52.90 |
| Mix9 | 2078.98 | 3093.81 | 67.20 |
| Mix10 | 360.79 | 1135.17 | 31.78 |
| Mix11 | 826.84 | 2009.91 | 41.14 |
| Mix12 | 1636.76 | 2952.57 | 55.43 |
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Qin, Z.; Tian, Y.; Guo, X.; Chen, J.; Huang, H.; Ye, Z.; Wang, D.; Xu, E.; Huang, H.; Chen, X. Investigation of Water-Stability Behaviors in Coastal Mud Multiply Modified by Cement and Coarse-Particle Spoil. J. Mar. Sci. Eng. 2025, 13, 2105. https://doi.org/10.3390/jmse13112105
Qin Z, Tian Y, Guo X, Chen J, Huang H, Ye Z, Wang D, Xu E, Huang H, Chen X. Investigation of Water-Stability Behaviors in Coastal Mud Multiply Modified by Cement and Coarse-Particle Spoil. Journal of Marine Science and Engineering. 2025; 13(11):2105. https://doi.org/10.3390/jmse13112105
Chicago/Turabian StyleQin, Zipeng, Yan Tian, Xianding Guo, Jiongzhang Chen, Huang Huang, Zongkai Ye, Dongxue Wang, Erjin Xu, Hanwei Huang, and Xinxin Chen. 2025. "Investigation of Water-Stability Behaviors in Coastal Mud Multiply Modified by Cement and Coarse-Particle Spoil" Journal of Marine Science and Engineering 13, no. 11: 2105. https://doi.org/10.3390/jmse13112105
APA StyleQin, Z., Tian, Y., Guo, X., Chen, J., Huang, H., Ye, Z., Wang, D., Xu, E., Huang, H., & Chen, X. (2025). Investigation of Water-Stability Behaviors in Coastal Mud Multiply Modified by Cement and Coarse-Particle Spoil. Journal of Marine Science and Engineering, 13(11), 2105. https://doi.org/10.3390/jmse13112105

