Sustainable Soil Improvement: Soft Clay Stabilization Using Rice Husk Hush and Waste Spent Catalyst RCC 15

Sandy D Sagala; Syahril S; Dian Adiputra Purba; Alexandre Marques

doi:10.35313/potensi.v27i1.6518

Authors

Sandy D Sagala Politeknik Negeri Bandung https://orcid.org/0009-0001-9917-4769
Syahril Politeknik Negeri Bandung
Dian Adiputra Purba Politeknik Negeri Bandung
Alexandre Marques Department of Civil Engineering, Institute Polytechnic of Betone

DOI:

https://doi.org/10.35313/potensi.v27i1.6518

Keywords:

Soft Clay Stabilization, Rice Husk Ash, Spent Catalyst RCC 15, Compressive Strength, California Bearing Ratio

Abstract

This study explores the chemical stabilization of soft clay soil to enhance its bearing capacity and improve its performance under structural loads. A fixed proportion of Rice Husk Ash (RHA) at 6% by weight was combined with varying amounts of spent catalyst RCC 15 (5%, 7%, 9%, and 11%) as stabilizing agents. The experimental program included the characterization of soil index properties, followed by engineering tests with emphasis on Unconfined Compressive Strength (UCS), Atterberg limits, compaction characteristics, and California Bearing Ratio (CBR). The Atterberg limit tests indicated a consistent reduction in the plasticity index (PI) with increasing RCC content, reflecting improved soil stability. Compaction results showed an increase in Maximum Dry Density (MDD) and a decrease in Optimum Moisture Content (OMC), with the highest MDD (13.29 kN/m³) and an OMC of 25.67% achieved at 6% RHA and 11% RCC. UCS values increased progressively, reaching a maximum of 1.822 kg/cm² with the same mixture. CBR results further supported these findings, with unsoaked values increasing from 4.75% to 6.60%, and soaked values from 3.30% to 6.20%. The combined use of RHA and RCC 15 significantly improves the geotechnical properties of soft clay, highlighting its potential as a sustainable and effective construction material.

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