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Rock mass is a volume of rock consisting of rock material in the form of minerals, texture, composition and also consisting of discontinuous planes, forming a material and interconnected with all elements as a unit. The rock mass itself is composed of several intact rocks which basically have isotropic, continuous and homogeneous properties. However, the conditions found in the field are different, namely anisotropic, discontinuous and heterogeneous. These properties will certainly influence the test results in the uniaxial test. There are several factors that influence the results of uniaxial rock tests, one of which is the scale effect. The purpose of this test is to determine and analyze the effect of rock sample size on the uniaxial compressive strength value of claystone. This rock testing was carried out at the Mineral and Coal Technology Laboratory and the rock sampling locations were in Palaran District, Samarinda City and in North Samarinda District, Samarinda City. In this uniaxial compressive strength test, 3 side widths with different lengths will be used. After carrying out the uniaxial compressive strength test, the average uniaxial compressive strength test value was obtained in each formation, such as the Balang Island formation, the average rock compressive strength test value was 1.68 Mpa and the Balang formation, the average rock compressive strength test value was 3.10. Mpa. Based on these results, it can be concluded that the larger the sample size, the smaller the rock compressive strength test value tends to be.      

Secara administratif Bendungan Pamukkulu terletak pada Desa Kale Ko’mara, Kecamatan Polombangkeng Utara, Kabupaten Takalar, Provinsi Sulawesi Selatan. Litologi pada Bendungan termasuk Formasi Batuan Gunungapi Baturape-Cindako yaitu lava dan breksi beserta retas-retas andesit. Metode penelitian berupa pemetaan permukaan dan pengeboran inti batuan. Berdasarkan investigasi geologi bawah permukaan, kelas batuan yang sesuai zonasi 3B yaitu pada Blok B1 (10-20m), Blok A3 (5-10m), dan Blok D (5-20m) dengan kelas batuan CH. Untuk zona 3A dengan kelas batuan CM terdapat pada Blok A3 (10-15m), Blok B1 (5-10m), dan Blok D (0-5m) dan zona 3C terdapat pada Blok A3 (1-5m), Blok B1 (5-10m), dan Blok D (0-5m) dengan kelas batuan CM. Dari hasil uji laboratorium mekanika batuan nilai Uji Kuat Tekan antara 33.36 MPa–67.24 MPa hal ini menunjukkan batuan memiliki nilai kekerasan dan kekuatan berkisar dari sedang sampai keras. Nilai Rock Quality Designation (RQD) pada lapisan atas 0-10m berkisar 13-68% dan lapisan 10-20m berkisar 83-99%. Analisis Fragmentasi batuan hasil blasting rata-rata boulder batuan berukuran 100cm ialah 18.74%. Rekomendasi dalam pembangunan bendungan pada area quarry yaitu perlunya penyesuaian blasting plan terhadap faktor-faktor geologi yang terdapat dilapangan agar fragmentasi dapat tercapai dengan baik.

The sandstones of the Ekmai Formation are composed of various minerals, both metal and non-metallic minerals, especially industrial minerals. This study aims to identify the types of industrial minerals within the sandstones using XRD analysis. The main mineral identified is quartz. Other minerals groups are carbonates, clay, garnet, feldspar, amphibole, chlorite, epidote, and olivine.