Fragmentation Evaluation of Some Selected Mudrock in Indonesia Indiced by Physical and Mineralogical Properties
Misbahudin1, Pramudya Rinengga Datu Perdana1, Dian Yesy Fatimah1, Fajar Febiani Amanda1, Dyah Pratiwi Kusumastuti2, Budi Wicaksono2, Arief Suardi Nur Chairat3

1Geology Engineering Study Program, Faculty of Exploration and Production Technology, Universitas Pertamina, Indonesia

2Civil Engineering Program, Institut Teknologi Perusahaan Listrik Negara (ITPLN), Indonesia

3Industrial Engineering Program, Institut Teknologi Perusahaan Listrik Negara (ITPLN), Indonesia

Abstract

Not many mud rocks from various formations have been evaluated for slaking characteristics in Indonesia. Mudrock disintegrate rapidly when interacting with the atmosphere and hydrosphere. This research investigates the mudstones from the Kerek Formation and then evaluates their fragmentation resulting from slaking. This formations are known for causing road, slope, and land-strengthening engineering problems. Rocks frequently result in slope failure in the area around their outcrops. The method includes quantitative analysis of rock slaking levels, which collide with the physical and mineralogical properties of the rocks. The slaking test with natural exposure for five cycles was carried out on the samples. The mineralogical composition of mudrock does not show a significant relationship, likewise, with the macroscopic texture of the sample. The presence of abundant fossils in the sample affects the slaking level of the sample. We found the slaking index values of the samples generally shows slight difference. The results of this study can be correlated with other mudrock in different areas and formation in Indonesia. Specifically, the relationship between rocks physical properties and microscopic texture should be considered in the slaking classification of rocks.

Keywords: mudrock, slaking, fragmentation, microscopic texture, mineralogy

Topic: Solid Earth Sciences