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Karakteristik Aspal Buton Ekstraksi yang Dimodifikasi dengan Oli Bekas dan Plastik HDPE
Full text linkAsphalt functions as an aggregate binder in the road pavement mixture. The rapid construction of roads causes the need for asphalt to increase, while its availability is limited. The government is promoting the use of natural asphalt (Asbuton) as an alternative to oil asphalt. However, asphalt performance from Asbuton is not good. Uneven asphalt content and Asbuton hardness are factors causing it to be less effective as a binder. It is necessary to improve performance by modifying the bitumen separated from Asbuton granules by the extraction process. The modifications were made using used oil and high-density polyethylene (HDPE) plastic waste. Samples were made for each variation of used oil and HDPE in two ways: a constant 5% used oil composition and a constant 2% HDPE. In the constant 5% oil variation, 0%, 2%, 4%, and 6% HDPE are used. Whereas at a constant 2% HDPE, 0%, 3%, 5%, and 7% used oil are used. The tests carried out were: 1) Moisture content and ash content of asphalt extracted from Asbuton, 2) Penetration of asphalt, 3) Ductility; 4) Loss of weight, 5) specific gravity, 6) softening point, and 7) flash and burn points. The performance of modified asphalt is known from the results of data analysis from the tests carried out. The results of the analysis showed that in the asphalt weight loss test, specific gravity, and softening point, pure Asbuton extraction asphalt and the results of the modification as a whole met the requirements. However, in the penetration test, only 3 variations met the requirements, namely: 5% and 7% used oil, and 2% and 6% HDPE. Whereas in the ductility test, flash point, and burning point, all variations and asphalt extraction of pure Asbuton did not meet the requirements. Low ductility, meaning that asphalt does not have good cohesive properties. The low flash point and burning point indicate that the asphalt is easy and fast to burn, which affects the mixing process. Thus, it is still necessary to optimize the composition of the modifier so that the requirements for ductility, flash point, and firing point are met
Pengaruh Pengalaman Tenaga Kerja terhadap Produktivitas Tenaga Kerja Proyek Konstruksi Gedung Bertingkat di Kota Palu
Full text linkOne measure of the success of high-rise building construction projects is the labor. High labor productivity will support timely completion of projects and more efficient use of costs. Labor productivity will be easily achieved if human resources have previous work experience. The purpose of this study was to determine the effect of labor experience on labor productivity in high-rise building construction projects in the city of Palu. Primary data collection through the distribution of questionnaires, interviews, surveys and documentation. Secondary data is obtained through information on the contractor company. Data analysis using descriptive statistics and multiple linear regression. The results showed that partially the length of time work (X1) and the level of knowledge and skills (X2) had a positive effect on labor productivity (Y) but not significantly. Meanwhile, mastery of work and equipment (X3) partially has a positive and significant effect on labor productivity (Y). Simultaneously the variable length of time/work time (X1), level of knowledge and skills possessed (X2), variable mastery of work and equipment (X3) has a positive and significant effect on labor productivity (Y) with a coefficient of determination (R2) of 88.4%
The Implementation of Lesson Study in Teaching Mathematics in Region 3, Cluster XI South Palu
Full text linkThis research is a descriptive study with a qualitative approach, which aims to describe the application of Lesson Study in mathematics learning to teachers and students in Region 3 Cluster XI Palu Selatan. Lesson Study is effectively applied in learning mathematics. This can be proven from the results of interviews which explain that the application of lesson study in learning mathematics can be understood by most of the teachers who are members of the 3 Cluster XI area of South Palu. In addition, the results obtained in the activity plan are lesson plans, media used in learning, learning modules, and observation sheets. In the activities carried out there are three important activities, namely the activities of the teacher carrying out mathematics learning in mixed arithmetic operations, observers observing learning, and students in learning. In the listening activity, the model teacher starts the discussion by conveying his impressions, experiences, opinions about the implementation of the learning he has carried out
Pengaruh Groundsill Pada Degradasi dan Agradasi Dasar Sungai Winongo (Studi Kasus Simulasi Dengan Sedimen D50)
Full text linkOne of the rivers in Yogyakarta with sand as its riverbed material is the Winongo River, which has a high potential for riverbed degradation or agradation. Upstream and downstream of the groundsill construction, respectively, can experience degradation and agradation of sediment transport. In this research, the effectiveness of the MPM, Engelund Hansen, and Laursen Copeland equations on HEC-RAS 6.3.1 is examined in terms of determining the level of overall degradation and agradation of the Winongo River bed. The discharge data used in modeling is in the form of secondary data taken from the 2021 DPUPESDM using two discharge conditions, namely wet discharge (Feb-Mar) and dry discharge (August-Sept). There are 796 cross sections along the river's 41.3 kilometer length, 9 of which are groundsill structures. For all equations, d50 serves as the grain diameter. Based on the results of the simulation, the upstream groundsill frequently agradation while the downstream groundsill tends to degradation. The MPM and Engelund Hansen equations are closer to actual field survey than the Laursen Copeland equation, according to the simulation using the three equations. The nine groundsills on the Winongo River still have the potential to harm the river bank by collapsing the downstream portion of the structure because the condition of degradation in the downstream groundsill is more prevalent than aggradation in the upstream groundsill. Due to the average d50 grain size, it is more likely that models used to predict changes in river bed elevation may degrad
Estimasi Emisi Kendaraan Ringan pada Ruas Jalan Perintis Kemerdekaan Kota Makassar
Full text linkPopulation growth is increasingly demanding economic growth accompanied by the need for transportation as facilities of movement person and goods. The increase of transport it is not balanced with the right policies will cause various problems appertain the increasing number of motorized vehicles that has an impact on the environment, namely increasing air pollution. Exhaust emissions from motorized vehicles originating from fossil fuels make impact the environment. Various studies on transportation models have been developed by many researchers, various transportation models can also estimate emissions from motorized vehicles included MOVES and IVEM. The aim of this study is to analyze whether there are differences between the results of the emission estimation model in the MOVES and IVEM programs. The method used is using a driving cycle, where the vehicle is tracking on the highway using GPS second per second. Tracking is carried out on the Perintis Kemerdekaan road with a starting point of KM 7.75 to the end point of KM 13.12 as well as for the opposite direction. Tracking done at peak hours of 7-10 am, 11-14 noon, and 11-14 afternoon. The results showed that the concentration of Nox emissions was higher in the MOVES model data analysis than the IVEM model, as the CO emission concentration in the morning and evening was higher in the MOVES model and the CO emission concentration during the day was higher in the IVEM model. Statistically with the t test, the result is 0.13 where the result of the CO concentration for the MOVES and IVEM models are the same and for the t test the NOx concentration is 0.008 that the results of the analysis of the IVEM and MOVES models for NOx are not the same
Penggunaan Metode Pavement Condition Index (PCI) dan Present Serviceability Index (PSI) dalam Penilaian Kerusakan Jalan di Kota Palu (Studi Kasus : Jalan Karanja Lembah, Kota Palu)
Full text linkStreet of Karanja Lembah is a provincial road linking Palu City and Sigi Regency. After a visual survey, the road has suffered a lot of damage, especially on its surface. The purpose of this study was to determine the pavement condition values based on the Pavement Condition Index (PCI) method and the Present Serviceability Index (PSI) method, as well as to determine the type of road handling based on the PCI and PSI values obtained on these roads. The PCI method is carried out directly by dividing the road into several segments called segment units, then recording the type of damage, the dimensions of the damage, and the severity of the damage for each type of damage. In research using the PSI method, the PSI value was calculated using IRI (International Roughness Index) data obtained from the Highways Service of Central Sulawesi Province. From the results of the analysis, it was obtained that the average PCI value for Jalan Karaja Lembah was 79.95% with a "very good" pavement condition, while the average PSI value for Jalan Karaja Lembah was 2.13% with a pavement condition "moderate". For the right type of handling for the PSI and PCI methods, namely the type of periodic maintenance
Peningkatan Tebal Lapis Perkerasan Kaku pada Jalan Yos Sudarso Kumbe dengan Metode AASHTO
Full text linkYos Sudarso Road is a connecting road heavily traveled by heavy vehicles. The number of heavy vehicles that often pass through this road is one of the supporting factors for the damage to the road, in addition to the absence of maintenance and improvement carried out, resulting in a decrease in the level of serviceability of the road. This condition is the main objective of this research, namely to determine the design of increasing the thickness of the rigid pavement layer on Jalan Yos Sudarso Kumbe. The method used in this improvement is the American Association Of State Highway And Transporting official 1993. The research conducted on Yos Sudarso Kumbe road includes collecting CBR data using DCP tools, surveying traffic volume to find the LHR value, then observing how long the puddle of rainwater on the road surface will disappear to determine the drainage quality. From the results of the analysis and calculations carried out using the 1993 AASHTO method with 15% CBR, the thickness of the pavement layer is 135 mm (5.2 inches) because the thickness of the pavement layer does not meet the minimum standard of rigid pavement thickness with low traffic volume. The minimum standard of rigid pavement thickness with low traffic volume is 150 mm (6 inches), with D10 mm reinforcement and 30 cm spacing between support, D19 mm dowel, 45 cm length, 30 cm spacing between bars, and D16 mm tie bars, 70 cm length, 75 cm spacing between bars
Analisis Penurunan Tanah Timbunan Menggunakan Metode Elemen Hingga pada Ruas Jalan Tolango-Bulontio STA 47+600
Full text linkSubsidence is a change in the composition of the soil and small spaces in the soil. The method that can be chosen to reduce the rate of decline that occurs on the road is preloading and adding geotextiles. The purpose of this study was to analyze the settlement that occurred in the embankment soil before and after the geotextile was applied. The research location is on Jalan Tolango-Bulontio STA. 47+600 Wubudu Village, East Sumalata District, North Gorontalo Regency. The primary data used is the characteristics of the embankment soil, while the secondary data is in the form of plan drawings, N-SPT values, and geotextile characteristics. Land subsidence analysis was carried out by modeling in two dimensions using the finite element method with the help of the Plaxis 2d v20 application. Structural modeling using plane strain model. The results showed that the settlement of the embankment using geotextiles that the settlement of the embankment soil at point A (shoulder) was 33 mm <65 mm, while the settlement of the embankment without geotextile was greatest at point A (shoulder) of 33 mm. mm < 65 m (allowable descent). The settlement value of the embankment without geotextiles and the use of geotextiles did not have a significant difference because the geotextiles used only functioned as filtration, not as reinforcemen
Kajian Sistem Drainase Perumahan di Kota Luwuk Kabupaten Banggai
Full text linkLuwuk City is the center of the city of Banggai Regency, which continues to grow. Urban development is followed by an increase in population and land requirements. Changes in land use from open land such as forests, gardens and dry fields to land for settlements causes surface water infiltration to decrease and increase surface runoff. Increased runoff due to reduced water catchment areas as the impact of city development has caused existing drainage to not be able to accommodate the increasing runoff water, resulting in waterlogging or even flooding. About 80% of the water used by the community is discharged directly as liquid waste into drainage canals. This condition of the community results in the accumulation of waste or silt in the drainage channels. This study aims to examine the drainage system in Luwuk City. The study was carried out by evaluating the existing canal system and identifying the suitability of the primary and secondary canals. Based on the results of the analysis carried out in this study, there are several things that can be concluded, namely: several drainage paths indicate the direction of flow does not follow the topography so that this can cause waterlogging and there are 3 natural channels that can be used as primary drainage and 6 natural channels that can be used as secondary drainage so that it will help speed up the flow of water to the final storage are
Analisis Kapasitas Saluran Drainase pada Wilayah Padat Penduduk dengan Menggunakan Rational Modification Method
Full text linkMerauke City, as a city in a growth and development period, cannot be separated from various problems. The provision of inadequate city facilities and infrastructure is one of the factors in the situation, drainage, for example. Generally, drainage handling in Merauke City is not comprehensive, so it has yet to handle the problem of inundation or flooding entirely. In residential areas around Estuary 3, puddles or floods are often found whenever rain is high enough intensity. Given that the city of Merauke, including in a flat area or the absence of elevation differences, makes one of the causes of waterlogging or flooding. This study aims to determine the capacity of estuary drainage channels in 3 Merauke Regency to accommodate or drain planned flood discharge. The research method used in this study is the rational method. This study uses two analyses, namely hydrological analysis and hydraulics analysis, where hydrological analysis a carried out to determine planned flood discharge by calculating daily rainfall using probability distribution and hydraulics analysis to determine channel capacity discharge by calculating cross-sectional dimensions. Based on the results of the study shows that segment 1 to segment 10 has different capacity discharge (Qs) and flood discharge (Qr). Segment 1 is one of the channel segments capable of accommodating or draining planned flood discharge with a capacity discharge of 5.51"m" ^"3" "/sec" and flood discharge of 2.07 "m" ^"3" "/sec" (Qs>Qr). In segment 7, which is the segment with the minor channel discharge, namely channel capacity discharge (Qs) of 0.004 "m" ^"3" "/sec" and plan flood discharge (Qr) of 0.78"m" ^"3" "/sec" then, the channel is unable to accommodate or drain plan flood discharge (Qr > Qs). And for other segments, the track cannot adjust or drain the planned flood discharge (Qs<Qr) with a capacity discharge between 0.003-0.05 "m" ^"3" "/sec" with a deliberate flood discharge of 0.21-1.19 "m" ^"3" "/sec"