INVOTEK: Jurnal Inovasi Vokasional dan Teknologi
Vol 25 No 3 (2025): INVOTEK: Jurnal Inovasi Vokasional dan Teknologi

Relationship Between CBR Value and Soil Compaction Under Various Number of Blows

Nadra Mutiara Sari (Civil Engineering Department, Politeknik Negeri Sriwijaya, Jl. Srijaya Negara, Palembang, Indonesia-30139)
Darma Hendra (Professional Engineer Program, Faculty of Engineering, Universitas Negeri Padang, Jl. Prof. Dr. Hamka, Air Tawar, Padang, Indonesia 25131)
Soegeng Haridjadi (Civil Engineering Department, Politeknik Negeri Sriwijaya, Jl. Srijaya Negara, Palembang, Indonesia-30139)
Ajun Wiratama (Civil Engineering Department, Politeknik Negeri Sriwijaya, Jl. Srijaya Negara, Palembang, Indonesia-30139)
Rifki Adisyaputra (Civil Engineering Department, Politeknik Negeri Sriwijaya, Jl. Srijaya Negara, Palembang, Indonesia-30139)



Article Info

Publish Date
22 Jun 2026

Abstract

Subgrade is one of the essential components in road pavement construction, particularly in flexible pavement. This is because the subgrade serves as the foundation that supports the overall load above it. Therefore, it must have a high bearing capacity with a minimum California Bearing Ratio (CBR) value of 6%. To achieve this requirement, efforts to increase the CBR value are needed, one of which is through soil embankment and compaction. In this study, soil compaction was carried out to obtain the desired CBR value. The sample consists of 18 samples with each impact variation (25, 35, 45, 55, 65, and 75 times) being three samples. The fill soil comes from the Gandus area, Palembang city. The test results showed the lowest CBR value of 2.79% at 25 blows with a dry density of 1.51 g/cm³, and the highest value of 14.23% at 75 blows with a dry density of 1.95 g/cm³. At 45 blows, a CBR value of 8.05% with a dry density of 1.78 g/cm³ was obtained, which already meets the subgrade requirement. It can thus be concluded that the greater the number of blows, the higher the CBR value. However, the dry density did not significantly increase beyond 55 blows, indicating that the soil had reached a sufficient level of compaction with minimal air voids, and further compaction was unnecessary since the standard CBR value had been achieved.

Copyrights © 2025






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 ...