http://invotek.ppj.unp.ac.id/index.php/invotek <p>INVOTEK:&nbsp;<em>Jurnal Inovasi Vokasional dan Teknologi</em>&nbsp;is a peer reviewed journal that publishes twice a year&nbsp; (April and October) on articles concerning Technical &amp; Vocational Education and Training (TVET) practices in both the formal and informal sectors and also technology field. &nbsp;It provides an academic forum and scientific research discussion for the cross-disciplinary exchange of insights and ideas regarding value and practices for dissemination. We welcome article submissions from the local and international TVET researchers and practitioners. We strongly welcome research articles and will also consider critical reviews as well as technical reports that can further our understanding of TVET issues and concerns.</p> Universitas Negeri Padang en-US INVOTEK: Jurnal Inovasi Vokasional dan Teknologi 1411-3414 http://invotek.ppj.unp.ac.id/index.php/invotek/article/view/1350 <p>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%.</p> Nadhifah Alifia Dewayanti Retnaningrum Latif Budi Suparma Suryo Hapsoro Tri Utomo Copyright (c) 2026 Nadhifah Alifia Dewayanti Retnaningrum, Ms, Latif Budi Suparma, Suryo Hapsoro Tri Utomo http://creativecommons.org/licenses/by/4.0 2026-08-15 2026-08-15 26 1 1 10 10.24036/invotek.v26i1.1350