Abstract
Clay shale is a claystone which in fresh condition has a very high shear strength. When it reacts with the atmosphere or hydrosphere it will weather so that the shear strength of clay shale will drop drastically. The weathering potential of clay shale is generally done by the slake durability test and the weathering process is measured by disintegration ratio test (DR). The strength of clay shale that has fully weathered will increase again when it is stabilized with a minimum of 6% PC (Portland Cement). It was found from the wetting drying cycle process testing that durability of re-weathering of stabilized clay shale with PC is increased compared to natural clay shale. Disintegration ratio of natural clay shale DR was smaller than stabilized clay shale with 6% PC. Additionally, more than 6% PC increased the durability of re-weathering of clay shale.
Highlights
The number of geotechnical failures to infrastructure construction in Indonesia over the last 10 years has been due to a lack of proper understanding of the properties of clay shale soil, which is quite different with other soil
The weathering process causes the decreasing of clay shale shear strength by the clay shale layer reacting with the atmosphere or hydrosphere for several reasons, mainly due to excavation activities
Weathering occurs due to geological processes, such as an earthquake, which causes the fault on the clay shale layer up to the ground surface, it is penetrated by water and, the clay shale formation makes contact with the hydrosphere [2]
Summary
The number of geotechnical failures to infrastructure construction in Indonesia over the last 10 years has been due to a lack of proper understanding of the properties of clay shale soil, which is quite different with other soil. The weathering process causes the decreasing of clay shale shear strength by the clay shale layer reacting with the atmosphere or hydrosphere for several reasons, mainly due to excavation activities. Weathering occurs due to geological processes, such as an earthquake, which causes the fault on the clay shale layer up to the ground surface, it is penetrated by water and, the clay shale formation makes contact with the hydrosphere [2]. The size of its large grain becomes smaller, as is presented in the cumulative percentage graph marked with the size of the grains From this graph, the disintegration ratio (DR) can be determined by calculating the ratio of the area of the field at the initial conditions divided by the area of the field when the weathering changes [3]. Grain size distributions were used to quantify the amount of disintegration of each sample in terms of DR, after varying periods of exposure to natural conditions [7]
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