Comparison of fly ash with Lapindo mud as a land stabilizer for landfill in Pasuruan–Indonesia




landfill, soil stability, fly ash, Lapindo mud, sieve testing, compaction, silt, specific gravity, direct shear test, internal shear angle


The paper discusses the comparison of fly ash with Lapindo mud as a land stabilizer for a landfill in Pasuruan, Indonesia. Land for landfills has a low level of stability due to the condition of garbage that has accumulated and undergoes a process of decay. This land condition is less favorable to support the construction of the building above it if one day the location is used for construction. Therefore, it is necessary to stabilize the soil first. The purpose of this study was to determine the effect of adding a mixture of TPA soil with fly ash and Lapindo mud. The method used by sieve testing and compaction of the specimens for each treatment consisted of a mixture of TPA soil with fly ash and TPA soil with Lapindo mud, while the percentages of fly ash and Lapindo mud to the dry weight of the original soil were respectively 0 %, 10 %, 15 %, and 20 %. The results showed that stabilization of the landfill with fly ash reduced the silt content while stabilization with Lapindo mud increased the levels of silt in the landfill so that fly ash was better than Lapindo mud for stabilization of the landfill. The specific gravity values for both stabilization mixtures increased equally. Based on the results of the standard compaction test for the addition of a mixture of fly ash, the OMC value decreases and the greater the value of dmaxs indicates that fly ash is good for landfill stabilization, while the addition of a mixture of Lapindo mud increases the OMC the smaller the value of dmaxs. For the direct shear test of the two mixed soils, the value of the internal friction angle (Æ) increased. The percentage value of the optimum mixture of mixed soil+fly ash is 14 % with an internal shear angle (Æ) of 38°, while the stabilization of landfill with Lapindo mud obtained the optimum mixture percentage value of 11 % with an internal shear angle (Æ) of 31°

Supporting Agency

  • Thank you to the Institute for Research and Community Service (LPPM), the University of Widyagama Malang who has funded this research.

Author Biographies

Agus Tugas Sudjianto, University of Widyagama Malang

Associate Professor

Department of Civil Engineering

Abdul Halim, University of Widyagama Malang


Department of Civil Engineering

Oktiono Gembiranto, University of Widyagama Malang

Department of Civil Engineering

Sugeng Hadi Susilo, State Polytechnic of Malang


Departmentof Mechanical Engineering


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How to Cite

Sudjianto, A. T., Halim, A., Gembiranto, O., & Susilo, S. H. (2021). Comparison of fly ash with Lapindo mud as a land stabilizer for landfill in Pasuruan–Indonesia. Eastern-European Journal of Enterprise Technologies, 3(10(111), 19–26.