Strengthening Gypsum Soils: The Role of Lime and CaCO3 Nanoparticles in Enhancing Suction and Compressive Strength
DOI:
https://doi.org/10.56294/sctconf20251513Keywords:
gypsum soil, compressive strength, suction, lime, CaCO3 nanoparticlesAbstract
This study examines the characteristics and stabilization of two types of gypsum soils, known for their high gypsum content, which affects their physical and chemical properties. Gypsum soils pose challenges in construction due to their solubility in water, leading to instability. The research focuses on the interaction of moisture content, gypsum concentration, and soil structure under different climatic conditions.
The study evaluates the relationship between soil total suction, measured by the filter paper approach, and unconfined compressive strength in both natural and processed gypsum soils. Stabilization techniques using CaCO3 and lime nanoparticles (NPs) were explored. The connection between compressive strength and total suction was established through the degree of saturation obtained from the soil water characteristic curve and optimal water content.
Results showed that for SG50 soil, the maximum compressive strength increased with treatment ratios up to (L3% + N1%), which had the highest strength. Beyond this ratio, slight fluctuations were observed, while total suction continued to decrease. This is likely due to nanoparticle agglomeration at excessive treatment levels, reducing soil cohesion. In SG2% soil, compressive strength showed fluctuations, initially increasing, then decreasing until stabilization, while total suction was consistently reduced. The lower suction values in SG2% soil compared to SG50% are attributed to its lower gypsum content, which reduces chemical reactions with water and the formation of suction-enhancing compounds.
References
Rahardjo H, Kim Y, Satyanaga A. Role of unsaturated soil mechanics in geotechnical engineering. Int J Geo-Eng. 2019;10(1):1–23. (https://doi.org/10.1186/s40703-019-0104-8) DOI: https://doi.org/10.1186/s40703-019-0104-8
Himed KA, Bolouri J, Abdalhusein MM. Unsaturated conditions of gypsum sand soils and its improvement with CKD material. In: International Conference on Geotechnical Engineering Iraq. Singapore: Springer Nature Singapore; 2024 Apr. p. 3–16. (https://doi.org/10.1007/978-981-97-9364-8_1) DOI: https://doi.org/10.1007/978-981-97-9364-8_1
Fattaf MY, Al-Obaidi AAH, Al-Dorry MK. Collapse and volume change of unsaturated gypseous soil: A model study. Geotech Geol Eng. 2024;43(1):13. (https://doi.org/10.1007/s10706-024-03012-y) DOI: https://doi.org/10.1007/s10706-024-03012-y
Abdila SR, Syafwandi MI, Sobirin M, Hidayat A. Soil stabilization using gypsum and the effect based on the unconfined compressive strength values. Available from: (http://www.ieomsociety.org/harare2020/papers/732.pdf).
Pande PB, Khandeshwar SR, Bajad SP, Raut SP. Calibration of filter paper for measuring total soil suction. SN Appl Sci. 2019;1(7):803. (https://doi.org/10.1007/s42452-019-0820-x) DOI: https://doi.org/10.1007/s42452-019-0820-x
Uchaipichat A. Effect of suction on unconfined compressive strength of clayey soils with different sand contents. ARPN J Eng Appl Sci. 2014;9(6).
Minato EA, Brignoli FM, Neto ME, Besen MR, Cassim BMAR, Lima RS, et al. Lime and gypsum application to low-acidity soils: Changes in soil chemical properties, residual lime content and crop agronomic performance. Soil Tillage Res. 2023 Oct;234:105860. (https://doi.org/10.1016/j.still.2023.105860) DOI: https://doi.org/10.1016/j.still.2023.105860
Al‐Ghawas SA, Kelso WI. A routine procedure for measurement of calcium carbonate activity in gypsum rich soils. Commun Soil Sci Plant Anal. 1996 Mar;27(5–8):1299–309. (https://doi.org/10.1080/00103629609369634) DOI: https://doi.org/10.1080/00103629609369634
ASTM International. ASTM D5298-16: Standard test method for measurement of soil potential (suction) using filter paper. West Conshohocken, PA, USA; 2016.
Houston SL, Houston WN, Wagner AM. Laboratory filter paper measurements. Geotech Test J. 1994;17(2):185–94. DOI: https://doi.org/10.1520/GTJ10090J
Lee HC. An evaluation of instruments to measure soil moisture condition [Master’s thesis]. Lubbock (TX): Texas Tech University; 1991.
ASTM International. ASTM D2166: Standard test methods for unconfined compressive strength of cohesive soil. West Conshohocken, PA, USA; 2000.
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