INVOTEK: Jurnal Inovasi Vokasional dan Teknologi
Vol 26 No 1 (2026): INVOTEK: Jurnal Inovasi Vokasional dan Teknologi

Application of Calcined Green Mussel Shell Powder to Increase Peat Soil Stability Against CBR Values as a Road Pavement Subgrade

Nadhifah Alifia Dewayanti Retnaningrum (Master Programme in Transportation Systems and Engineering, Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta, Jl. Grafika No. 2, Kampus UGM, Yogyakarta 55281)
Latif Budi Suparma (Master Programme in Transportation Systems and Engineering, Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta, Jl. Grafika No. 2, Kampus UGM, Yogyakarta 55281)
Suryo Hapsoro Tri Utomo (Master Programme in Transportation Systems and Engineering, Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta, Jl. Grafika No. 2, Kampus UGM, Yogyakarta 55281)



Article Info

Publish Date
15 Aug 2026

Abstract

Peat soil has compressible properties, high water content, and low bearing capacity, so it needs to be stabilized to increase its strength as a road pavement subgrade. Peat soil is commonly found in South Sumatra, especially in the Banyuasin II District, Banyuasin Regency, South Sumatera. This study added green mussel shell powder (CaCO3) and calcined mussel shell powder (CaO) as stabilizers with the CBR (California Bearing Ratio) testing method. This test was carried out with variations in the mixture of mussel shell powder (0%, 10%, 20%, 30%) and curing time (0, 3, 7 days), as well as testing physical and mechanical properties such as atterberg limits, specific gravity, sieve analysis, soaked CBR, and unsoaked CBR. Samples with optimal CBR values will be added with CaO (calcined mussel shell powder) 10% to see its effect. Based on the test results, the original peat soil has an unsoaked CBR of 0.65% and a soaked CBR of 0.65%. After the stabilizer was mixed, the optimal variation was found in a mixture of peat soil plus 30% shell powder with 7 days of curing at 13.7%, while for soaked CBR, with a variation of 30% soaking for 4 days at 8.5%. Furthermore, this variation was mixed with calcined shell powder (10%) to see its effect. The test results showed a significant change, the values of unsoaked CBR 35% and soaked CBR 45%.

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Journal Info

Abbrev

invotek

Publisher

Subject

Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Transportation

Description

INVOTEK: Jurnal Inovasi Vokasional dan Teknologi is a double blind peer-reviewed journal for Technical, Vocasional, Education and Training (VET) related research. This journal provides full open access to its content on the principle that making research freely available to the science community and ...