Optimization of clayey soil parameters with aeolian sand through response surface methodology and a desirability...

Area of Science:

• Geotechnical Engineering
• Soil Science
• Materials Science

Background:

• Weak clayey soils pose challenges in geotechnical engineering.
• Stabilization is essential for improving soil mechanical properties.
• Aeolian sand offers a potential reinforcing material.

Purpose of the Study:

• To investigate the effect of incorporating roadside aeolian sand on clayey soil properties.
• To determine the optimal mixture composition for soil reinforcement.
• To develop predictive models for geotechnical parameters.

Main Methods:

• Experimental analysis using methylene blue test, Atterberg limits, compaction tests, direct shear, and oedometer tests.
• Response surface methodology (RSM) with central composite design (CCD) for optimization.
• Statistical validation using ANOVA and regression analysis.

Main Results:

• Significant improvements in soil strength and compaction characteristics observed with up to 30% aeolian sand.
• Methylene blue value, liquid limit, plastic limit, and plasticity index decreased.
• Maximum dry density and internal friction angle increased, while cohesion, compressibility, and swelling coefficients decreased.
• RSM models demonstrated high predictive accuracy (R² > 0.97).

Conclusions:

• Incorporating 30% aeolian sand is an effective and sustainable method for enhancing clayey soil stability.
• The developed models accurately predict geotechnical property changes.
• Findings support practical applications in foundation and road construction, especially in arid regions.