Analisis Densitas, Porositas, dan Struktur Mikro Batu Apung Lombok dengan Variasi Lokasi dan Kedalaman Mohammad Ridha, Darminto

Abstract

This paper explains the characterization and analysis of density, porosity, and microstructure of Lombok pumice as natural composite materials. Pumice is taken from three locations in Lombok, there are desa Ijobalit (location I), desa Lendang Nangka (location II), and desa Karang Sidemen (location III) with a depth of excavation ± 0,3 meters and ± 3,0 meters of ground level. Pumice is washed, dried, and formed to be samples test. Density and porosity of sample are tested by Archimedes method. Microstructure of sample is characterized by SEM and the results are analyzed by Image-J software to get porosity and the average pore size of cross-sectional area. This research get natural density is (0,610-0,753) gram/cm3, dry density is (0,594 - 0,737) gram/cm3, saturated density is (1,057-1,148) gram/cm3, and porosity value is (32,03-51,20)%. The highest natural density value is obtained from the sample of location III with a depth of excavation ± 0,3 meters of ground level. The highest porosity value is obtained from the sample of location III with a depth of excavation ± 0,3 meters of ground level. The results of SEM micrographs of sample show that Lombok pumice is composed by pores which are uniformly distributed with different sizes. By using Image-J software, analysis of the SEM micrographs of sample get the porosity value is (38,38-56,80)%. So, Image-J software is relevant used to determine porosity of the SEM micrograph of Lombok pumice sample.