Buton Island Research Articles

Performance of Asphalt Mixture with Asbuton Based on Marshall Characteristics Compacted at Hot and Cold Temperatures

The use of natural asphalt is an alternative to meet the high demand for oil asphalt. Asbuton is natural asphalt from Buton Island, Indonesia. However, the use of Asbuton is not as easy as oil asphalt because the asphalt it contains is hard. The asphalt-concrete mixture must go through a rejuvenation process for several days before being compacted. This study aims to determine the performance of asphalt-concrete mixture using Asbuton if it is compacted immediately after mixing, without giving time for the rejuvenation process. Compaction is done when the mixture is hot and after the mixture is cold. Compaction of the asphalt-concrete mixture in hot temperature (150ºC), based on mechanical characteristics (stability, flow, and Marshall Quotient), has better performance than that compacted in cold temperature (30ºC). However, compaction in both hot and cold temperatures, based on their volumetric characteristics, does not meet the requirements for use as road pavements. The performance of the asphalt mixture can be improved by giving time in the process of softening the asphalt content in Asbuton

GOVERNMENT STRATEGY IN MANAGEMENT OF PARKING RETRIBUTION IN NATURAL TOURISM AREAS

South Buton Regency, as one of the tourism destinations in the Buton Islands, features a variety of tourist attractions. The government must manage parking costs in tourist areas, and every use of the budget must be transparent, so a village government strategy to turn strengths into opportunities, strategies to exploit weaknesses into opportunities, strategies to transform threats into strengths, and strategies to avoid threats is required. As a result, the goal of this research is to examine the village government's parking fee optimization technique to boost Regional Original Income. This type of study employs a qualitative approach and a descriptive approach, as well as a SWOT analysis. According to the SWOT analysis, the parking management of the Kaburaburana tourist area has been progressing well in an endeavor to boost tourism potential. However, these findings continue to present challenges or hurdles at various stages of the process.

Termite transects from Buton Island, Sulawesi, have a low diversity compared with Sundaland sites

AbstractWe used a standardised transect method to compare lowland forest termite assemblages in Buton Island, Sulawesi, with transects in Sundaland. The four Buton transects were extremely depauperate with species density ranging from 1 to 6 species, which is around 10% of the species density in 11 described Sundaland transects. Soil-feeding species were absent from the Buton transects but represent some 43% of species in the Sundaland transects. The Buton transects have relatively high soil pH (6.7–7.9), which may be associated with depauperate termite assemblages. Most termite genera recorded in Sulawesi are wood nesters that can raft in floating wood, which is probably how they arrived in Sulawesi. The Macrotermitinae (fungus-growers) do not raft and probably flew across serendipitously. Geographic isolation, both on Buton and in Sulawesi more generally, and Buton’s underlying geology causing high soil pH, may account for the near-absence of soil-nesters and soil-feeders, none of which are known to raft.

The Performance Modeling of Modified Asbuton and Polyethylene Terephthalate (PET) Mixture Using Response Surface Methodology (RSM)

We often use the plastics daily, containing of polyethylene plastic polymers which recently can be utilized as additional material for road pavements. Several studies have attempted to find the optimum proportion of an asphalt mixture using modified Asbuton which is local bitumen abundantly deposited in Buton Island Indonesia, added with plastic waste. The optimum proportion of the asphalt mixture is influenced by many factors, such as the interactions of the material component in the asphalt mixture. To obtain the optimum proportion based a single factor, many studies employ statistical methods. This study aims to determine the optimum proportion for the asphalt mixture of the modified Asbuton with PET plastic waste by using a Response Surface Methodology (RSM). The employed RSM is the Expert Version 12 design (Stat-Ease, Inc., Minneapolis, MN, USA, 2020), in which the statistical modeling based on Box Behnken Design (BBD) and three factorial levels. The results obtained in this study show that the RSM optimization could achieve the asphalt mixtures characteristics including the stability, Marshall Quotient (MQ), Void in MIX (VIM), Void Mineral Aggregate (VMA) and density, in the level of satisfying the specification requirements of Ministry of Public Works of Indonesia. The optimum stability is at 2002.72 kg, fulfilled the minimum density of 800 kg. For the MQ, the optimal point of MQ is 500.68 kg/mm, satisfied the minimum the MQ standard minimum of 250 kg/mm. In addition, the optimal VIM is at 3.40%, satisfying the VIM specifications in the range of 3–5%. The optimal VMA response is at 21.65%, which is also satisfied the VMA specification, 15%.

Geoid of South East Sulawesi from airborne gravity using Hotine approach

In the past, geoid was computed from gravity anomaly data using Stokes or Molodensky approaches. Obtaining gravity anomaly data is difficult because it needs some reductions of gravity from surface of the earth to the geoid using orthometric height from spirit level measurement. In the modern era, gravity anomaly data may be replaced by gravity disturbance data. It only required gravity and GNSS (Global Navigation Satellite System) measurement. This research aimed to determine geoid using Hotine’s approach. Disturbance data were generated from archived free air anomaly of airborne gravimetry in Sulawesi area. South East Sulawesi province was selected as a case study area. In this study, gravity observation was calculated at an altitude of 4000 m above the reference ellipsoid. Gravity estimation at the same height aims to increase the precision of the downward continuation process to the geoid. Hotine integral is calculated above the geoid, so that the gravity disturbance data is downwarded to the geoid. The geoid undulation is graded from north to south. Geoid from airborne gravity around Pegunugan Mekongga in the northern part of Southeast Sulawesi Province has the largest geoid undulation which reaches 63 m, while the geoid in the southern part of Buton Island reaches 52 m. Geoid validation of airborne gravity at 13 test points produces a standard deviation of ± 0.050 m. The standard deviation is much smaller than the results of geoid testing from airborne data in North Sulawesi, Central Sulawesi and Southeast Sulawesi. This fact indicates that the Hotine approach has the potential to produce a precise geoid if used in geoid-based airborne gravity calculations.

Study on the Influence of Surfactant Addition for Bitumen Separation from Asbuton Rocks using Hot Water Process

Indonesia has a bitumen reservoir in a form of rocks located in Buton Island, Southeast Sulawesi. These rocks contain both bitumen and mineral. Bitumen was mostly used for road preparation, hence bitumen had to be separated from its mineral. It was concluded from previous researches that bitumen extraction using the hot water process had a low bitumen recovery. One way to improve its recovery was by adding surfactant. This research aimed to study the effects of anionic and cationic surfactant addition to the percent recovery of bitumen. There were three main processes of bitumen extraction using hot water namely; preparation, mixing-preheating, and digesting. First, asbuton rocks were ground into fine material, then it was sieved using sieve number 30. Then it was continued by mixing asbuton and diesel oil with a ratio of 60:40 at 250 rpm at 60°C for 30 minutes. Then the second process was done by mixing diesel oil-asbuton and wetting agent solution that contains Sodium Dodecyl Benzene Sulfonate (SDBS) as anionic surfactant and NaOH at 1500 rpm for 30 minutes. The other mixture is Dodecyl Trimethyl Ammonium Bromide (DTAB) as a cationic surfactant and NaOH. In this research, the concentrations of surfactant used were 0.125; 0.25; 0.375; 0.5%, the used NaOH concentrations were constant at 0.5% (% mass), while the variation of temperature used were 60, 70, 80, to 90°C. The product of the digestion process was taken into beaker glass for 24 hours to separate into 3 layers by gravitational force. The top layer is a bitumen-diesel oil solution. The result showed that the performance of SDBS is better than DTAB, this could be because DTAB is positively charged, yet the minerals are negatively charged, so they tend to bind. It can be concluded from this study that the highest percent recovery of bitumen was 72.30 % at a temperature of 90°C with SDBS surfactant concentration of 0.125%, which means anionic surfactant had a better result than cationic surfactant.

New species records from Buton Island, South East Sulawesi, including regional range extensions

Peninsular Malaysia is currently thought to host the highest biodiversity of Old World bats of any region, with 110 species recorded. However, the availability of literature to facilitate a similarly thorough species ‘checklist’ is not as readily available for other parts of Southeast Asia, including Sulawesi, Indonesia. Here we highlight 13 new species records from the long-term bat monitoring programme on Buton Island, South East Sulawesi, expanding on Patterson et al.’s (2017) previous inventory for this study area. One species (Hipposideros galeritus) is a new record for Sulawesi, and seven species (Cynopterus c.f. minutus, Rousettus celebensis, Megaderma spasma, Hipposideros c.f. ater, Myotis c.f. horsfieldii, Myotis c.f. moluccarum, and Myotis c.f.muricola) are new records for Buton Island. The remaining five species (Thoopterus nigrescens, Dobsonia exoleta, Acerodon celebensis,Mosia nigrescens, and Mops sarasinorum) have been previously reported from Buton but were missing from the prior site inventory. We also correct a probable mistaken species identification in the previous inventory (Cynopterus cf. titthaecheilus, now identified as Thoopterus nigrescens). This brings the total of confirmed species detected on Buton to 35, equating to 46.7% of all Sulawesi’s known bat diversity in c. 3% of its land area. We highlight Buton as a key area for conserving the region’s bat species.

Morfologi Jenis Tembelekan (Lantana camara L.) di Beberapa Wilayah Kepulauan Buton

Tembelekan ( Lantana camara L.) is an upright or semi-climbing shrub with a distinctive odor which is native to tropical and sub-tropical regions. This plant has many variations. The purpose of this study was to determine the morphological diversity of tembelekan using field observation methods in Buton, Central Buton, and South Buton Districts. The characterization process was carried out at the Integrated Laboratory of the Muhammadiyah University of Buton. The results of the observations were analyzed qualitatively by comparing the characters between individuals. The results showed that there were two groups of tembelekan in the Buton Islands, namely the orange and pink flowering groups. The orange flowering group has ovate leaf shape, coarse-hairy leaf surface, acute leaf apice, acuminate leaf base, serrate leaf margin, longer leaf size than the pink group, sepal is almost identical in size, orange flower group has fewer corolla than pink flower group. While the pink flowering group has deltoid leaf shape, coarse-hairy leaf surface, acuminate leaf tip, acuminate leaf base, serrated leaf margin, different sepal sizes and magenta flower color. It can be concluded that the two groups of tembelekan have differences in leaf shape, leaf tip, leaf length, sepal size, number and color of the corolla.

Experimental Study on Bearing Capacity of Alkaline Activated Granular Asphalt Concrete Columns on Soft Soils

In civil engineering, alternative materials showed rapid progress. Asphalt derived from Buton Island in Indonesia, also known as Asbuton, was located in the limestone bedrock. A large deposit of Asbuton could guarantee the supply of alternative construction materials. In that regard, Asbuton performance as an alternative material to several subjects needs to be analyzed. Therefore, this study was conducted to analyze Asbuton’s behavior as a filler in a floating column model as a soft soil improvement concept. Asbuton added to sand and gravel mixture as filler and waterglass as a binder. CBR samples were tested to acquire the optimum composition with varied curing days namely 0, 3, and 7 days, following ASTM D-1883, followed by a compressive column model test which was based on ASTM D-2166. Finally, the column applied to the soft soil layer to be tested in a loading test, and the results are then compared for each composition. The results showed that the granular material's composition including Asbuton, the waterglass content, and the curing period significantly affect the engineering properties of the artificial column. The results revealed that the granular column with Asbuton with the addition of waterglass could increase soil’s load capacity and reduce the settlement of soft soils. Doi: 10.28991/cej-2020-03091623 Full Text: PDF

Analisis Singkapan Batuan Pasca Pengambilan Bahan Galian Di Pulau Buton

Rock outcrop is one type of geological data that often used in mining to determine rock types. Besides that rock outcrops can also be used to find out how strong a rock even though rock mechanics have not been tested. Rock strength depend on various factors, one of which is lithology. One of the physical parameters that describes rock strength is density. Each rock type has different density. The purpose of study is to determine lithology or rock type after extracting the minerals. The rock outcrop as object of the study is the rock wall after the extraction of the rock material which is located in Baubau City, Buton Island. The research method was carried out by observing rock physical properties and correlating the rock type with the rock density. The interpretation of rock outcrops is focused on observing the physical features and rock minerals. Based on the analysis, the rock outcrop is dominated by limestone. Based on rock type, the density of the rock outcrops ranges from 2.5 g.cm-3 to 2.9 g.cm-3. The variation in density values indicates that the rock outcrop is strong and stable.

Analysis Mixed Layer Asphalt Surface as Asbuton Ac-Wc Characteristics of Marshall

Natural asphalt is asphalt obtained somewhere in nature, and can be used as obtained or with little processing. No natural asphalt obtained in the mountains like asphalt in Buton island called Asbuton. Asphalt Buton island is a mixture of bitumen material with other mineral materials in the form of rocks. Because asbuton is so sajaa material found in nature, the levels of bitumen dikandungnyaa greatly varies from low to high. To overcome this, then asbuton began to be produced in various forms at the processing plant asbuton. To reduce the use of natural asphalt eat more steps to do research on utilizing asbuton with the composition 6%, 8%, 10%. The purpose of this study is 1.) Determine the material characteristics LGA Asbuton can meet the specifications of Highways in 2018 on a mix of AC-WC 2.) Determine the value of Optimum Asphalt Content on asphalt concrete AC-WC (Asphalt Concrete - Wearing Course) with extra material LGA Asbuton 3.) Knowing how the performance of asphalt concrete AC-WC with additional material and bitumen 60/70 Asbuton terms of Marshall Test. The study was conducted with an experimental method through laboratory testing. The expected benefits of this research is the discovery of optimizing the use of Asbuton for at the time of execution of the work of new road construction or road maintenance and provide alternative natural aggregate material consumption to a minimum.The test results for the optimum bitumen content KAO on the composition 1 Asbuton 6% with a variation of bitumen (5.05% 5.55% 6.05% 6.55% 7.05%) of the chart can be found KAO Marshall 6.2%. Composition 2 Asbuton 8% with a variation of asphalt (5.0% 5.5% 6.0% 6.5% 7.0%) on the graph can be found KAO Marshall 6.3%. Composition 3 Asbuton 10% with a variation of asphalt (5.0% 5.5% 6.0% 6.5% 7.0%) on the graph can be found KAO Marshall 6.4%. Variations in the composition of 6%, 8% and 10% meet all the requirements of the properties of hot asphalt mix can specification of Highways in 2018.

Chemical, morphological, and high temperature rheological behaviour of Bioasbuton® as an alternative binder for asphalt concrete in Indonesia

Asbuton is a natural asphalt from mountains/rocks on Buton Island, Indonesia, with deposits of 677.247 million tons with an estimated bitumen content ranging from 15% to 35% or equivalent to 170 million tons of asphalt. The use of granular asbuton in an asphalt mixture requires modifier/rejuvenating material with low viscosity so that it can enter the asbuton granules more easily and can soften the asbuton bitumen and mobilize it evenly in the asphalt mixture. Coconut shell biobinder (BioCS) is a bio-oil fraction produced from fast pyrolysis of coconut shell, with the ability as a modifier/rejuvenator. The use of BioCS for granular asbuton on asphalt mixtures can be an alternative environmentally friendly road pavement technology. Before conducting tests on the asphalt mixture, it is necessary to test the characteristics of the asphalt binder, which is bioasbuton®, which is a binder from BioCS with asbuton bitumen at an optimum composition that can be used as an alternative binder for asphalt mixture. The tests include a chemical structure test using fourier-transform infrared spectroscopy (FTIR), a morphological and elemental content test with scanning electron microscope (SEM) and energy dispersive x-ray (EDX) analysis, a basic physical properties test with a basic rheological test, and a mechanistic physical properties test through dynamic shear rheometer (DSR) temperature sweep. As an asphalt binder base, the asphalt pen 60/70 was used which was then compared with bioasbuton® and asbuton bitumen. The test results show that the characteristics of bioasbuton® are better than asbuton bitumen and meet the specifications of pen 60/70. Based on the results of this study, prove that bioasbuton® as an alternative asphalt binder that has good potential, especially at high temperature performance.

Potential of Local Plants from Buton Island as a Source of Learning Biology

The aims of this study is to identify the diversity of local plants on the island of Buton, the results of the identification of potential learning resources, the potential of local plants on the island of Buton to be used as a source of learning to achieve basic skill in the 2013 curicullum. This researches is a method of exploratory research that contains survey, observation and interview for the use of local plants. The data analysis used is the exploratif analysis and analysis of potential learning resources through a literature review. The results of this study indicate that 23 species of local plants have been identified on Buton Island to be used as a functional food, coloring agents, plastic subtitutes, herbs and spices, medicines and cosmetics, and raw materials for crafts/textiles. The local plants are Amorpophalus sp., Dioscorea alata, Setaria italica, Maranta arundinaceae, Cajanus sp., Oryza sativa, Indigofera sp., Tectona grandis, Hibiscus tiliaceus, Ficus septica, Pisonia alba, Musa balbisinia, Sterculia sp., Amomum sp., Spondias pinnata, Sandoricum koetjape, Averhoa balumbi, Eleutherine palmifolia, Donax canniformis, Pandanus sp., Lygodium circinatum, Bambusa blumeana, and lapi. Based on the requirements of fulfilling local potential as a source of learning that includes aspects of potential clarity, conformity to goals, clarity of objectives, clarity of information revealed, clarity of exploration guidelines and clarity of expected outcomes. the results of research in the form of local plant potential on Buton Island to achieve K.D-3.2 2013 curriculum on Indonesian Biodiversity Materials can be used as a source of biology learning for SMA class X.

Preliminary Study on Compressive Strength of Porous Asphalt Containing Modified Buton Asphalt, Waste Plastic and Limestone Powder

Porous asphalt is a surface layer or a wear layer is one of the asphalt material developed to overcome the problem of inundation during the rainy season making it suitable for use in Indonesia which has high rainfall intensity. Furthermore, it is necessary to optimize the use of a number of natural resources in Indonesia such as natural rock asphalt in Buton Island (BRA) and limestone which is available in many places. In addition, reducing of plastic waste is attracts the attention of a number of countries including Indonesia. This paper is part of a series of investigate study related to the behaviour of porous asphalt mixture made with modified Buton asphalt (MBA), waste plastic and lime stone powder. The compaction results showed good adhesion can unite the waste Polyethylene terephthalate (PET), limestone powder and coarse aggregate particles. There is no visible negative effect of waste PET and limestone powder in porous asphalt mixture against compressive strength.

Catalytic pyrolysis of Asbuton into liquid fuel with Zeolite as catalyst

Natural Buton Asphalt (Asbuton) is a naturally occurring asphalt that is contained in rock deposit located in Buton Island, Indonesia. Asbuton is mostly used as a mixture of bitumen since it has the potential to be cracked into hydrocarbon and produced as a liquid fuel for energy consumption. The present study aims to investigate the effect of pyrolysis temperature and the mass ratio of the Asbuton with catalyst on the Asbuton conversion. The pyrolysis process is carried out on a batch using vacuum reactor with various temperatures and mass ratios of catalyst to Asbuton. The gas coming out of the process is passed through the condenser, where the condensed gas (liquid product) is collected in the flask, whereas the uncondensed gas (gas product) is collected in a gas holder and the yield is analyzed upon the pyrolysis process completion. The respond parameter of the catalytic pyrolysis are oil flammability, yield, and oil density. The synthesized ZSM-5 catalyst is more effective for the Asbuton bitumen cracking process as opposed to the Natural Zeolite. Furthermore, it is investigated that the most optimum operating condition throughout this experiment was 70.07% and obtained at 350 °C with 9% ZSM-5 catalyst. In terms of product characterization, the liquid product can be ignited during the flame test. From the S.G. and API gravity values, it is suggested that the products belong to crude oil range, and thus, confirming that Asbuton has great potentials to be developed into alternative fuel.

Learning the properties of Buton asphalt as an oil shale in Buton island to expand the knowledge of students about physics

Asphalt in Buton Island, Southeast Sulawesi, Indonesia, has a large reserve amount of around 650 million tons. In Buton, asphalt is only used for road construction, but this asphalt has characteristics that can be utilized as a substance to produce crude oil. The purposes of this research are to increase or expand the knowledge of educated participants about the characteristics and advantages of Buton asphalt and oil shale as community natural resources and to compare the density of each asphalt mining area namely Kabungka (winto mine), Lawele, and Sampolawa. It aims is to make Buton asphalt as a source of learning. The research method used is the literature study and experiment. The results of the study are that the characteristics of asphalt Buton approach the characteristics of oil shale in Green River, US. The density of Buton asphalt in each region is different. Conclusion of the research that asphalt/tar sand on Buton Island is categorized as a solid/semi-solid type hydrocarbon oil shale. The implementation of this study can be used for senior high school of class X student by visiting the asphalt mine to conduct simple experiments such as measuring the height of the asphalt cliff and determining the direction of the wind eye. Asphalt is used to measure its density. The experiment procedure is made in a module that will later be used by students.

Effect of addition of dodecyl trimethyl ammonium bromide surfactant toward recovery of bitumen from asbuton with modified hot water process method

Asbuton is a natural asphalt that contained in rock deposits in Buton Island, South East Sulawesi. Asbuton used as an alternative of oil asphalt by separating bitumen from its minerals. The study was conducted to measure bitumen to improve bitumen with the addition of surfactant. In this study, the surfactant used is Dodecyl Trimethyl Ammonium Bromide (DTAB), which acts as a wetting agent to decrease the surface tension between bitumen and minerals. Bitumen was separated from asbuton using a modified hot water process that involved mixing and digesting process. Both of these processes performed on a stirred disc turbine tank and four baffles. The process of mixing preheating by stirring asbuton with diesel oil at 250 rpm for 30 minutes. Then the diesel-asbuton mixture was digested with surfactant Dodecyl Trimethyl Ammonium Bromide (DTAB) and Sodium Hydroxide and mixed at 1500 rpm for 30 minutes. The surfactant concentration used are 0.125%, 0.25%, and 0.375% and the temperature of 70°C, 80°C. The highest result obtained when the surfactant concentration is 0.25% and temperature of 80°C with 56, 46% recovery.

Internalisasi Nilai Kearifan Lokal Pobinci-Binciki Kuli pada Usahawan Buton dalam Etika Bisnis Syariah untuk Mewujudkan Kesejahteraan

This study aims to interpret the value of local wisdom of the Buton's natives pobinci-binciki kuli through entrepreneurs and then internalize it in sharia business ethics to achieve prosperity and well beings of the people. The approach used in this study is an ethnographic approach that makes Central Buton as a center of research. The findings in this study are the values of the local wisdom of Buton's island natives pobinci-binciki kuli which can be internalized in Islamic business ethics as follows: Defining value, pomae-maeaka (mutual shame) internalized in nature siddiq (integrity), internalized in value poma-maasiaka (love one another) internalized in nature fatonah (Intelligence), internalized in values of popia-piara (mutual protection) internalized in nature of amanah (trustworthy) and the value of poangka-ngkataka (mutual support) internalized in nature tabligh (communicative). These are the identities inherent in the Prophet Muhammad. when running a business. Therefore, sharia business ethics in real terms have been applied by the people of Central Buton through the local wisdom of Buton's natives, known as the pobinci binciki kuli. These values have brought Central Buton’s entrepreneurs to achieve prosperity oriented to the world and hereafter.

PERFORMANCE OF POROUS ASPHALT CONTAINING MODIFICATED BUTON ASPHALT AND PLASTIC WASTE

Many areas in the Southern region in Buton Island, Indonesia possess immense sources of solid bitumen (high hydrocarbon substances). The compounds of Buton rock asphalt (BRA) are approximately 30% bitumen and 70% mineral. Although several products of BRA in granular form have been used in asphalt mixture production but due to the limited information of BRA products those have yet to be tapped for widely usage. In recent decades several BRA companies have been successfully extracted the bitumen from the rock asphalt. Bitumen of BRA has similar properties with the petroleum asphalt, therefore, it can be blended with petroleum bitumen to produce modified Buton asphalt (MBA). In this study Polyethylene Therephthalate (PET) and Buton modified asphalt (BMA) was used to produce porous asphalt mixture. The compacted porous asphalt specimens were subjected to Marshall stability-flow test, indirect tensile strength and horizontal strain in order to evaluate its performance. The experimental results indicated that the PET and BMA based porous asphalt mixture with proper binder formulation can provide desired performance.

Characteristics study of over boulder asbuton as pozzolanic material for soft soil stabilization

Over Boulder Asbuton is a natural asphalt from Buton Island which is a layer of topsoil with a large deposit that can be used as a road material because besides containing bitumen, the mineral also has lime (CaCO3) which is quite high up to 80% with its mineralogy content containing Calcium amounting to 79.64% and silica element at 9.63% so that the mineral composition contains positive ions and can be said to be pozzolanic material, which can function as a stabilizing material on soft soil. Therefore, in this study utilizing these minerals as an alternative to soil stabilization ingredients. The purpose of this study was to evaluate the Asbuton Over Boulder characteristics as a stabilization material through laboratory tests so that the proportion and variation of Asbuton Over Boulder minerals were obtained to increase the bearing capacity on expansive soils. Over Boulder Asbuton was taken at the location of the Kabungka, Lawale, and Sampolawa blocks, then the preparation of the material was carried out in the laboratory, namely by drying in the open air until it reached air dry. The specimens used were cylindrical in H = 2D size, from the Asbuton Over Boulder mineral test results, the qu max value was obtained at 21 days curing time = 0.624kg / cm3, in the Proctor optimum moisture content. The value of California Bearing Ratio (CBR-Unsoaked) was 12.06% and the value of California Bearing Ratio (CBR-Soaked) obtained was 8.04%. So from the results obtained, that the utilization of Asbuton Over Boulder greatly affects the stability of the soil that will be used as a construction material.