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All Journal Technema: Journal of Intelligent Engineering and Computing
Muhammad Rusli Ahyar
Universitas Islam Sultan Agung

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An Experimental Study on the Use of Foam Mortar to Improve the Bearing Capacity of Soft Soil Muhammad Faruk Bajri; Muhammad Rafa Saptono; Abdul Rochim; Muhammad Rusli Ahyar
Technema: Journal of Intelligent Engineering and Computing Vol. 1 No. 3 (2026): Technema: Journal of Intelligent Engineering and Computing
Publisher : CV SCRIPTA INTELEKTUAL MANDIRI

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Abstract

Soft clay soils generally exhibit low bearing capacity, high plasticity, and limited shear resistance, making stabilization necessary for construction applications. This study investigates the effect of foamed mortar addition at 0%, 15%, 20%, and 25% on the physical and mechanical properties of soft clay obtained from Semarang City, Indonesia. The research employed a quantitative experimental approach through laboratory testing, including grain-size analysis, Atterberg limits, direct shear testing, Standard Proctor compaction, and laboratory California Bearing Ratio (CBR). The untreated soil was dominated by clay-sized particles at 89.88% and exhibited a specific gravity of 2.487, liquid limit of 53.21%, plastic limit of 29.82%, and plasticity index of 23.39%. The untreated soil also showed an internal friction angle of 11.06°, optimum moisture content of 34.00%, maximum dry density of 1.27 g/cm³, and unsoaked CBR of 5.10%. Increasing the foamed mortar content substantially modified the grain-size composition and improved the mechanical performance of the soil. At 25% foamed mortar content, the internal friction angle increased to approximately 34.50°, while the maximum unsoaked CBR increased to 25.70%, approximately 5.04 times the untreated value. The findings demonstrate that foamed mortar is effective in improving the shear resistance and bearing capacity of soft clay, with the 25% mixture providing the highest documented mechanical performance.
The Effect of Rice Field Snail Shell Powder Addition as a Fine Aggregate Substitution Material in Concrete Production Angger Panji Saputra; Muhammad Rusli Ahyar; Lisa Fitriyana
Technema: Journal of Intelligent Engineering and Computing Vol. 1 No. 3 (2026): Technema: Journal of Intelligent Engineering and Computing
Publisher : CV SCRIPTA INTELEKTUAL MANDIRI

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The increasing consumption of natural aggregates in concrete production encourages the utilization of alternative waste materials that can partially reduce dependence on conventional resources. This study investigates the effect of rice field snail shell powder as a partial substitute for fine aggregate on concrete workability, density, and compressive strength. A laboratory experimental method was conducted using five substitution levels of 0%, 2.5%, 5%, 7.5%, and 10%. The rice field snail shells were processed into powder passing the No. 100 sieve, and cylindrical concrete specimens with a diameter of 150 mm and a height of 300 mm were prepared and water-cured for 28 days. The average slump values were 165, 150, 137.5, 155, and 160 mm, respectively. The 28-day average compressive strengths were 28.26 MPa for the control concrete, 29.97 MPa at 2.5%, 22.33 MPa at 5%, 26.05 MPa at 7.5%, and 25.05 MPa at 10% substitution. The 2.5% mixture achieved the highest average compressive strength, while higher substitution levels did not consistently improve mechanical performance. The results indicate that rice field snail shell powder can partially replace fine aggregate, although its effectiveness depends on the substitution proportion and consistency of the concrete mixing process.
Co-Authors Abdul Rochim Angger Panji Saputra Lisa Fitriyana Muhammad Faruk Bajri Muhammad Rafa Saptono