bluuebunny/crossref_metadata_2025 huggingface dataset:
Identification of economic activity in coastal community (Case study: Bulu Cindea village, Bungoro district, Pangkep region of South Sulawesi)
Authors: Ali M , Rusli M , Ekawati S A
Published: February 2020

The tropical coastal and ocean region is a very productive area because this region is generally a place of concentration of economic activity. The main activities in Bulu Cindea Village consist of capture fisheries, pond aquaculture, agriculture, salt, and industry. The purpose of this study is to identify the economic activities of the community in Bulu Cindea Village. The analysis technique used in this study is a qualitative descriptive analysis technique to compare the existing and ideal conditions as well as the analysis of production projections to see the needs for the next five years. The results show that in the implementation of economic activities in Bulu Cindea Village there is still some that are not in accordance with the standard criteria (ideal conditions) which resulted in economic activities being less than optimal, fish auction places (TPI), and in some ponds are transferred as agricultural land which is adjusted to the slope.
The development of infrastructure in small islands based on environmental carrying capacity (Case study: Ndao Island, East Nusa Tenggara, Indonesia)
Authors: Kurdi S Z
Published: February 2020

Small islands with an area of 2000 km2 or less are vulnerable to sea level rising and accessibility. The availability of infrastructure plays essential roles in socio-economic activities and regional development. However, not all small islands can have the infrastructure needed, except those that have been selected and included in the regional/local government program on the priority of infrastructure provision. The small island of Ndao that locates in the Eastern Region of Indonesia has been developing after being formed into a sub-district in 2011. This paper discusses the possibility of Ndao Island for further development based on the criteria of environmental carrying capacity and vulnerability. The primary data obtained in 2017 and analysed with the Analytical Hierarchical Process (AHP) method, indicates that Ndao Island is recognised of having low carrying capacity and a deficit of clean water. Ndao has potential natural resources. Therefore, the Local Government has to include this island in the program of priority development by prioritizing the provision of clean water as its supply is limited and low quality due to seawater intrusion. Expectantly these findings become input in determining the priority development and estimating the future population following the carrying capacity of the environment.
Effect of limestone and buton granular asphalt (BGA) on density of asphalt concrete wearing course (AC-WC) mixture
Authors: Tumpu M , Tjaronge M W , Djamaluddin A R , Amiruddin A A , One La
Published: February 2020

This research aims to examine feasibility of local material of limestone as asphalt pavement aggregate and also Buton Granular Asphalt (BGA) was used for petroleum bitumen partial replacement in the Asphalt Concrete Wearing Course (AC-WC) mixture. The research method used is a laboratory experimental. Density of asphalt mix determined by void in mix (VIM) referred to Bina Marga specification, i.e. minimum 2,5%. The results showed that all of the mixtures meet the standard density which compacted by 2 × 75 blows. The secondary density was evaluated by using the specimen compacted with 2 × 200 blows. The secondary density AC-WC mix used limestone and petroleum bitumen pen. 60/70 binder did not meet the Bina Marga requirements, while AC-WC mix used limestone, petroleum bitumen pen. 60/70 and 10,5% BGA satisfied the stipulade of Bina Marga requirements.
Effects of vibration time on compressive strength and corrosion resistance of steel bars in concrete
Authors: Caronge M A , Tjaronge M W , Irmawaty R , Bakri B , Hamuddin S
Published: February 2020

In this paper, In this paper, effects of vibration time (0, 10 and 20 seconds) on compressive strength and corrosion resistance of steel bar in concrete are experimentally investigated. Compressive strength of concrete was performed on cylindrical specimens of Ø100x200 mm with water cement ratio (w/c) 0.52 after 28 days curing in tap water. Cylindrical specimens of Ø100x200 mm having 16 mm diameter of steel bar are considered for corrosion study. The specimens were subjected to cyclic wetting and drying regime up to 15 cycles. In wet cycle the specimens are immersed in sea water for 3 days, while in dry cycle the specimens were placed in open air for 4 days. The corrosion activity is monitored by measuring the copper/copper sulphate (CSE) half-cell potential according to ASTM C-876. The chloride penetration depths of concretes are also measured after 28 days immersed in 10% NaCl solution. Results show that compressive strength, chloride penetration depths and corrosion of steel bars is significantly affected by vibration time.
The potential utilization of Polyethylene Terephthalate (PET) waste as fine aggregate replacement in asphalt mixture
Authors: Meraudje A , Ramli M I , Pasra M , Amiruddin A A
Published: February 2020

One of the environmental issues in most regions of Indonesia is the large number of bottles made from poly-ethylene terephthalate (PET) deposited in domestic wastes and landfills. Due to the high volume of these bottles, more than 1 million m3 landfill spaces are needed for disposal every year. The purpose of this experimental study was to investigate the possibility of using PET waste in asphalt concrete mixes as fine aggregate replacement to reduce the environmental effects of PET disposal. Based on the test results, in term of horizontal stress and indirect tensile stiffness modulus (ITSM) the use of waste PET waste increased the performance of the asphalt mixture prepared by the MBA.
Correlation of modulus elasticity of Falling Weight Deflectometer (FWD) towards Light Weight Deflectometer (LWD) laboratory
Authors: Caroles L , Djamaluddin A R , Amiruddin A A , Arsyad A
Published: February 2020

Develop a new laboratory LWD and this study aims to analyse the laboratory version of the LWD with the field version of the LWD currently developed by Bina Marga, Indonesia. Basically, the working principle of the developed laboratory LWD is same as the LWD equipment in the field, which is an instrument that can measure deflection value and modulus of elasticity through load impulses arising from a load with a specific weight dropped at a certain height on a plate surface with a particular area on a pavement surface that is will cause deflection that is measured using a displacement sensor. A series of studies were conducted to compiled an equation that provides a correlation between the laboratory LWD and the LWD used in the field.
Effect of hollow core using plastic bottle to the flexural behaviour of RC beam
Authors: Sariman S , Djamaludin R , Irmawaty R , Parung H.
Published: February 2020

This study aims to analyze the behaviour of hollow core placing in the tension zone of reinforced concrete beams. The hollow was filled with plastic bottle waste. The partial replacement of concrete below the neutral axis by using a different layer of plastic bottles was discussed. The cross-section is filled with plastic bottles, in order to get a lighter structure, reduce the volume of concrete/cement and the reduction of environmental pollution. This study used RC beams with concrete strength of 25 MPa and dimensions of 150 x 350 mm, with 3D16 mm longitudinal reinforcement with the yielding strength of 475 MPa. Four type specimens are tested, consisting of control beam and hollow beams type with the height variation of 600 mm (BR1C), and 1800 mm (BR3C). The length of the hollow for each type was 1760 mm (8 bottles) The results indicated that the flexural capacity of the reinforced concrete beam with hollow-core using plastic bottles was almost same with the normal beam. Moreover, the effect of the height of the hollow core was also insignificant on the flexural capacity, where the beam with higher hollow-core showed similar flexural capacity with the beam having a lower hollow. However, the stiffness of reinforced concrete beam was affected by the height of the hollow core, inherent the higher the hollow core, the smaller the stiffness of the beams.
Effect of working method on the strength reduction of reinforced concrete beams
Authors: Fakhruddin  , Umam K , Djamaluddin R
Published: February 2020

Poor workmanship and improper construction methods often lead to the reduction of the concrete strength. This paper aims to investigate the effect of working methods on the strength reduction of concrete. Nine beams with the dimension of 150 mm wide, 200 mm depth and 3300 mm length were tested with the variation of compaction method and curing method. The variation of compaction methods was by using vibrator (V), tamping rod in the first layer only (1L), and tamping rod in all layers (3L). Meanwhile, the variation of curing methods was by using water (W), wet burlap (K), and room temperature (RT). The results indicated that the beam that was compacted using vibrator and cured in water (V-W) showed the highest flexural capacity. On the other hand, the beam that was compacted with the tamping rod in one layer and curing at the open space (1L-RT) showed the lowest flexural capacity. The experimental results were compared with analytical calculation to obtain strength reduction factor. According to Indonesian Code SNI 2847:2013, the strength reduction factor for the reinforced concrete beams is maximum 0.8. The V-W beam showed the smallest strength reduction factor of 0.93, while 1L-RT beam showed the highest strength reduction factor of 0.75. Therefore, the results indicated that working methods of using one layer tamping road was exceeded the maximum the strength reduction factor specified by Indonesia Code.
Reduced stiffness as structure acceptance criteria on cyclical loading in castellated beams
Authors: Aswad N H , Tachrir  , Syarif S , Nasrul  , Parung H , Amiruddin A A
Published: February 2020

The performance of RBS (Reduced Beam Section) on the exterior connection structure of castellated beam-column with cyclic loading method was tested on three specimens, which were the steel castellated beam without RBS (WRBSC), castellated steel beam with the RBS-1 (RBSC-1), and castellated steel beams with the RBS-2 model (RBSC-2). The three specimens were designed in an assumption of the strong column-weak beam and other assumptions based on seismic regulations as a condition for earthquake resistant building planning. This study presents the results of each specimen when given a certain structural response. The results also provide a detailed description of the test results starting from lateral axial loads. The lateral force was assumed to be the most dominant force acting in this experimental test, while the gravitational force was considered insignificant. Thus, this test only obtained structural performance when alternating lateral forces (cyclic test) was applied to the column frame structure and castellated steel beams. The values of life safety (LS) for the three specimens were 2.1 while the CP (Collapse Prevention) values of WRBSC, RBSC-1, RBSC-2 reached 4.3, 4.1, and 3.6, respectively.
Reinforced concrete mixture using abaca fiber
Authors: Tampi R , Parung H , Djamaluddin R , Amiruddin A A
Published: February 2020

This research study discusses the reinforcement of concrete mix design using abaca fiber. The process of mixing the abaca fibrous concrete used in this mixing is the dry mixing method. The addition of abaca fiber to concrete mixture was done with abaca fiber composition with fiber variation: 0%; 0.15%; 0.20%; 0,25% and variation of fiber length: 25 mm; 37.5 mm; 50 mm. The specimens of cylindrical material (100mmx200mm) and beam (100mmx100mmx400mm), are tested after the test object reaches the age of 28 days in the Universal Testing Machine (UTM) and are evaluated through the ASTM standard in compressive strength test, splitting tensile strength and flexural strength. The addition of fibers significantly affects the physical properties of the concrete, when the fiber increases the slump value will be smaller so the mixture becomes more difficult to mix. The results obtained by the abaca fiber concrete mixture for the composition (0.15%) and the ideal fiber length (50 mm) by providing an optimum value increase in the compression test of 12.61%, 72.64% tensile test, 98.98% flexural test of the normal concrete mixture.
The effect of additional sugar palm fibres on the durability of mixed Laston AC-WC
Authors: Datu S A , Rachman R , Selintung M
Published: February 2020

To obtain a good quality concrete asphalt, in the process of planning a mixture must consider the characteristics of a concrete asphalt mixture including durability which is the resistance of the asphalt mixture to the effects of weather, water, temperature changes, as well as wear due to vehicle wheel friction. Sugar palm fibres are many and easy to obtain because they come from agriculture. Sugar palm fibres have durable nature and are not easy to rot either in an open state (resistant to weather) or embedded in the soil. In this study, we will examine the effect of adding sugar palm fibres to the durability of the Laston AC-WC mixture, and sugar palm fibres as an addition to the binding of asphalt to the aggregate. The method used in this study is the Marshall method. The results showed that the durability of the mixture with 2% fibres added ingredients was still stronger than those using 1.5% so that the use of sugar palm fibres added in the Laston AC-WC mixture would help the durability of the mixture because the cavities in the mixture were getting smaller, so it was more waterproof, also the bond between aggregates which is the stability of the mixture can be maintained while maintaining the flexibility of the mixture. While the Marshall Immersion test results obtained strong mixture durability if the use of sugar palm fibres as added 2% in the mixture.
The effect of the shape and size of HDPE plastic admixtures on to K125 concrete
Authors: Tamrin  , Jamal M , Ramadhani P
Published: February 2020

This research uses admixture, namely HDPE plastic waste and aims to determine the effect of these admixture materials with different shape and size pieces on compressive strength and collapse as well as crack patterns on each concrete design, then to find the difference in the results of the compressive strength of each concrete made from material admixture as well as the shape and size of the pieces of plastic that are appropriately used as the material concrete admixture. This research used an experimental method, which compares the results of the compressive strength of normal concrete and concrete with the addition of plastic pieces of HDPE material, which are distinguished by shape and size. HDPE materials are cut into cubes with 1x1cm, rectangles measuring 0,5x2cm, and long sticks measuring 0.25 x 4 cm. The compassion of the percentage of material is added to the weight of cement which are equal to 5%. The results of compressive strength obtained respectively are, 136.915 kg/cm2 or 13.691 MPa for cube-shaped plastic pieces, 138.347 kg/cm2 or 13.835 MPa for concrete with rectangular plastic pieces which are the right shape and size to be used in concrete mix design, then 138,025 kg/cm2 or 13,803 MPa for concrete with long sticks pieces of plastic shaped, and the results of the concrete strength with admixture material are higher than the planned compressive strength and standard concrete. After that, the results of crack patterns for normal concrete were obtained, concrete with cube-shaped plastic pieces, concrete with rectangular plastic pieces, and long sticks plastic pieces of concrete, namely shear crack, crack voids and honeycomb, crack honeycomb, and crack concrete crazing and honeycomb. Whereas the collapse occurs between the coral joints with cement paste, and the plastic pieces are not damaged or broken. Therefore, the results of the study are found that differences in the shape and size of plastic pieces affect the value of slump, compressive strength, and collapse.
Recycling brick building waste as a filler on laston AC – WC
Authors: Palinggi M D M
Published: February 2020

Light brick and brick building waste is often found in the demolition of building construction in the form of building wreckage. This chunk can be considered as a substitute for materials in asphalt concrete mixture. The research objectives of light brick and brick building waste can meet specifications to be used as filler material in AC-WC Laston mixes as to which composition, filler levels, and what is the laston mixture of AC-WC which uses a building block filler. This research was conducted based on experiments with a combination of two fillers, namely building waste filler and cement filler, where the variation is. 100% cement filler, 0% building waste cement, 75% cement : 25% building waste, 50% cement : 50% building waste, 25% : 75% building waste, 100% building waste. This research was conducted based on an experiment with a combination of two fillers, namely building waste filler where the variation is.100% research cement filler, 0% building waste, 75% cement: 25% building waste, 50% cement : 50%. Building waste, 25% cement: 75% building waste, 100% building waste the results of testing the marshall characteristics can be concluded that the mixture of AC-WC laston using a variety of filler cement with the waste of light brick building and brick can be used.
Settlement development based on land suitability
Authors: Amir A K , Wunas S , Arifin M
Published: February 2020

The needs of settlements land are higher due to the increasing population, but the lands-availability in urban areas is getting narrower. Land use continues to grow as the initial process for the expansion of the city, its movement will out from the city centre to the periphery. Therefore, it is necessary to study the suitability land and develop the principles of the location planning of housing development. The research method using analytical hierarchy process (AHP) to calculate the weights, Geographical Information System (GIS) was used to create land suitability map, and overlay analysis result used to describe the principle of settlement location based on land suitability. The results show that 1) most suitable land for housing development is 637,75 hectare, low suitable land is 952,75 hectares and unsuitable areas of 781.5 hectares 2)The principles of settlement location based on land suitability are a)Clean water, available piped water network with adequate water quality terms smells, taste and colour, b)Flood prone, integrated drainage system development, optimization of reservoir performance and lake as water absorption, c)Accessibility, have road infrastructure and easy access to public transportation, d) Availability of land, not located in protected areas or technical irrigation, e) Availability of basic public service.
Characteristics of marshall additional hot rolled sheet base rattan fiber
Authors: Alpius
Published: February 2020

All Lataston or HRS structure consists of a mixture of coarse aggregate, fine aggregate, filler and binding material in the form of hot asphalt mixture. The relatively high asphalt content of the mixture aims to increase flexibility, durability and resistance to melt and not easily cracked. The mechanical properties of rattan are related to the ability to withstand external forces, including: compressive strength, fracture, stiffness, tenacity, tensile strength, shear, splitting and durability. This study aims to examine the characteristics of Marshall with the addition of rattan fiber as a mixture of gap graded Hot Rolled Sheet Base. Tests carried out on the characteristics of Marshall. The test results show the addition of rattan fiber with levels of 0%, 2%, 4%, 6%, 8% and 10% and asphalt content of 6.35% obtained VIM values with an increase of an average of 0.08%, Stability increases rattan fiber and will decrease if more rattan fiber is used, Flow will decrease along with the addition of rattan fiber and increase the value of flexibility if more rattan fiber is used, VMA increases with increasing rattan fiber used 0.07%, so that each additional rattan fiber will increasing VMA, VFB decreases with increasing rattan fiber used, durability testing results indicate the addition of rattan fiber will increase resistance to the load.
Delay distribution estimation at a signalized intersection
Authors: Susilawati  , Ramli M I , Yatmar H
Published: February 2020

Previous studies found that delay at signalized intersection accounted for more than one-third of total travel time. Different level of services tends to have different delay probability. An early assumption was made that multimodality occurs because of two traffic states experienced by the traveler; delay and non-delay at the signalized intersection. This study proposed a method to quantify delay distribution at a signalized intersection by analyzing the patterns in the speed time and speed distance profiles when passing two consecutive intersections and redrawing vehicle trajectory generated by ‘second by second’ GPS data. The searching algorithm was developed to search for the times when the vehicle enters and leaves the delay section by checking the ‘second by second’ speed data. To differentiate between the queue, move up and stop and go traffic, the algorithm searches for the idle time (i.e. when the speed less than 3.5 km/h). Along with Sydney Coordinates, Adaptive Traffic Systems (SCATS) degree of saturation and signal settings (green and red time) generating from SCATS systems at upstream loop detectors, a realistic delay probability model also was developed. This model used the General Additive Model for Location, Shape, and Scale (GAMLSS) which allows location, scale and shape parameter of selected distribution as a function of the explanatory variable. Signal settings and SCATS degrees of saturation were used as an explanatory variable. This model enables us to estimate delay experiencing by traveler depending on traffic parameters including traffic flow, signal settings and degree of saturation that are readily available on the site.
Efficiency of simple curb inlet design in Malaysia
Authors: Mustaffa Z , Meganathan S M P , Zaman A B K
Published: February 2020

This paper attempts to investigate the efficiency of typical curb inlet design used in Malaysia. Curb inlet is a common type of stormwater inlet of the urban drainage systems which functions to intercept excess stormwater on the street and convey them to another drainage system. The design (shape and type) of stormwater inlets used in a developing country like Malaysia, however might be considered as ‘too simple’ as compared to other developed countries. The choice of design might be heavily subjected to the aspect of easiness during construction. For a tropical country that receives a lot of rain throughout the year, this conventional design may eventually lead to street ponding. Thus, the effectiveness of these structures is then considered very crucial. Field investigation has been carried to study the actual performance of the curb inlet and its efficiency is reported. Results showed that the existing curb design would be efficient to intercept lower discharges because at higher discharges, the flow would be flowing downstream as bypass flows. Simple modification was proposed to the existing curb inlet by placing a 45° defelctor near the curb, which was found to be able to intercept 10% more flows to the inlets.
Influence of elementary students walking speed to children pedestrian pathway planning
Authors: Makalew F P , Adisasmita S A , Wunas S , Aly S H
Published: February 2020

Children pedestrian use pathways for access on their journey. As part of the infrastructure, the pedestrian pathway for elementary students, require adequate access to and from school. Among studies on pedestrian, research on child pedestrian walking speed is limited. Child pedestrian speed is influenced by walking time and distance. This research aim is to analyze children’s pedestrian walking speed and its influence on children’s pedestrian pathways. The method of research is a field survey with recorded elementary student’s pedestrian area of walking and their behavior. Data is collected from the video and photo recorded of 14 elementary schools in the urban area and 9 elementary schools in the rural area in North Sulawesi, Indonesia. This study involves elementary students age from 6 to 12 years old from grades 6 to 12. The analysis is a comparison of student pedestrian speed in the urban and rural areas and with previous research. Due to most pedestrian children behavior is to run to and from school, the children’s pedestrian speed is higher than previous research. Considering the area along their walking time, facilities provided should be friendly and safe for children. Therefore, children, pedestrian pathway needs specific regulation considering the urban and rural area.
Model influence means operational performance on the port of Jayapura
Authors: Bahtiar  , Adjisasmita S A , Ramli M I , Pasra M
Published: February 2020

The Port of Jayapura is located in Papua Province, including the Second Class Port within the Working Area of Indonesian Port IV, located between 02º 32º 30º LS and 140º 42º 30ºBT. The position of Port of Jayapura is strategic and part of the sea toll road in Indonesia, as it faces the Pacific Ocean in the north. Areas have potential as hinterland harbour Jayapura. Almost all of the district needs logistics in the central mountains of Papua, which are served by the Port of Jayapura. Distribution patterns are long enough to cause the cost component on behalf of transportation components can reach Rp 1.1 million per sack of cement or the price can rise to 1200%. The means have a significant effect on the port’s performance of 35.8%, meaning that every 100% increase in facilities will increase port performance by 35.8%. Infrastructure significantly affects the port’s performance of 42.6%, meaning that every 100% increase in infrastructure will increase the port’s performance by 42.6%. The Ulayat right has significant effect on the material of 38.9% with the negative direction that the increasing customary rights of the indigenous people will decrease the port performance. The increase of Ulayat rights by 100% will decrease the port’s performance by 38.9%.
Resistance to cohesion loss in cantabro test on specimens of porous asphalt containing modificated asbuton
Authors: Mabui D S , Tjaronge M W , Adisasmita S A , Pasra M
Published: February 2020

Nowadays, road pavement in Indonesia is still dominated by flexible pavement with petroleum bitumen mostly used as a binder. There is a huge deposit of hydrocarbon sedimentary rocks in several areas in Buton Island, Indonesia. One product of Buton natural rock asphalt is refined Asbuton modification which consists of approximately 70% bitumen and 30% minerals. An investigation of the effects of Asbuton modification on the performance of porous asphalt mixture was made using six mixtures based Asbuton modificated were 4.5%, 5.0%, 5.5%, 6.0%, 6.5%, and 7.0%. This paper presents a comparative parallel about resistance to disintegration or cohesion loss from the results of the Cantabro test for raveling resistance. The application of Retona Blend as a binder in the porous asphalt mixture improved the raveling resistance in relationship Asbuton modification content with cantabro loss value.
The effect of water immersion on compressive strength of Senoni stone, East Kalimantan
Authors: Eswan  , Adisasmita S A , Ramli M I , Rauf S
Published: February 2020

This study aims to analyze the compressive strength value of Senoni stone, East Kalimantan and its effect on water immersion. Free compressive strength testing is carried out at 25oC. The number of cylindrical and cube specimens for free compressive strength test each of 3 specimens. Compressive strength testing using the Universal Testing Machine (UTM). The results showed that the compressive strength of Senoni stones decreased due to water immersion. This shows that the stone of Senoni, East Kalimantan is not resistant to water.
Effect of the slope of flume bed to the debris potential flow
Authors: Petrus F , Pallu M S , Thaha M A , Maricar F
Published: February 2020

This article aims to determine the effect of the basic flume slope to the potential flow of debris flow. This article discusses the combination of open check dam type (beam type) placed at the top and the closed check dam type placed at the bottom with variation of the distance between the checks of dam in a flume with the size used in the experiment that is 30 cm x 32.8 cm x 1200 cm with a slope of 10°. The composition of the sediment used is type D50. The results of this study using three types of base flume slope are the greater the slope of the base flume will result in a greater debris flow on the condition without wood and on conditions with wood. The larger the slope, the greater the sediment and wood that passes from the check dam series. The smaller the base slope of the flume, the larger the timber being retained on the open check dam.
A flume experiment study of energy lose at downstream of a sluice gate
Authors: Maricar F , Maricar M F , Sasmito S G
Published: February 2020

A sluice gate is a controllable barrier that controlling the elevation of the water at the channel. Generally, energy change occurs at the upstream and downstream of watergate, caused by the impact of the water flow at watergate upstream. This study aims to analyze the energy change at Watergate and to compare the value of energy change that occurs at the channel with or without sediment. This research was carried out by the Civil Engineering Hydraulics Laboratory of the Faculty of Engineering, Hasanuddin University, which runs from December 2018 to March 2019. In this research, we use some variables that are channel bed condition, flume slope, debit, and watergate openings. The result of this research shows that debit and watergate openings really affect the value of the energy change, while the flume slope is not really affected it. The energy change that occurs at the flume without sediment is bigger than the energy change that occurs at the flume with sediment in it.
Determining water rate of the HIPPAM system
Authors: Bakri B , Selintung M , Usman F , Ihsan M , Arai Y , Mangarengi N A P
Published: February 2020

The increasing demand for drinking water demand in Indonesia is mainly determined by the rapid population growth. In overcoming the issue, the development and rehabilitation of water supply system are necessary. The tariff or rate of water is a price assigned by water authorities on water supplied and distributed to their customers through the pipe network. A tariff is not only to recover the full costs of its supply and production, but also to incorporate the operation costs. Hence, it establishes the continuity of the water supply in the future. This research aims to determine tariff or water rate in HIPPAM System with the case study at Salawaty District – Sorong Regency. The tariff should be adjusted to the ability to pay of customers, and it is based on the income and the amount of water paid in a month. Besides, the next parameter is the willingness to pay that can be obtained from the customer survey. The results show that the majority of customers are willing to pay the water rate at the low price of IDR 1500/m3. On the other hand, the research suggests that the most appropriate tariff in the study area is IDR 2456,1/m3. This tariff is assumed to be able to guarantee the continuity of the drinking water supply system in the future. Keywords: tariff, water supply, HIPPAM, Salawati District, Sorong Regency
Effect of wave steepness to relative wave run-up on OWEC breakwater
Authors: Puspita A I D , Thaha M A , Pallu M S , Maricar F
Published: February 2020

OWEC (Overtopping Wave Energy Converter) breakwater is a coastal structure model concept. The concept is to integrate the breakwater and the overtopping wave energy converter. This coastal protection model concept is equipped with a reservoir at the top of the structure to collect water that overflows from the top of the structure (overtopping). Many factors influence the amount of wave overtopping discharge; one of them is the run-up height. The height of wave run-up that occurs is influenced by many factors, one of which is the steepness of the incoming wave. The effect of the wave steepness to the relative wave run-up on OWEC breakwater is investigated experimentally. The study is carried out in wave flume with regular waves. The OWEC breakwater model is simulated with slope variations and freeboard variations. The results of the study show that small wave steepness value produces a large relative wave run-up value and vice versa. For a review of the structure slope, the results showed that the largest relative run-up value was obtained in the largest slope of the variation of the slope studied, namely 1: 2, at all different freeboard heights.
Experimental and numerical modeling of sand column applied on recharge reservoir to control seawater intrusion
Authors: Azis A , Yusuf H , Badaruddin S , Iqbal M , Faisal Z , Hasanuddin H
Published: February 2020

Excessive groundwater exploitation may lead to groundwater depletion, causing groundwater level at the inland lower than sea level and result in seawater intrusion (SWI) in a coastal aquifer. To control the occurrence of SWI, an alternative solution is to increase the replenishment of groundwater using a recharge reservoir. If a recharge reservoir is built in a region with soil hydraulic conductivity below 10-5 cm/s (semi impermeable), then a sand column is usually proposed, put on the bottom of the recharge basin and directly connected to the aquifer layer. The purpose of this study is to analyze the effectiveness of the sand column’s application in the recharge reservoir to control SWI. This research is an experimental study that combines physical and numerical modeling of the recharge basin with sand columns under a laboratory scale. The results of this research are beneficial for field applications because the process that occurs in the recharge reservoir can be determined prior to the real construction in the field. The results of the research are also useful to investigate whether the recharge reservoir is effective or not as a buffer of SWI in coastal aquifers. The expected result is that by using sand columns in the recharge basin, seawater intrusion can be controlled. It is hypothesized that the higher the number of sand column density and water level on the reservoir, the farther the freshwater saltwater interface is pushed toward the sea.
Flume experiments on log accumulation at the bridge with pier and without pier
Authors: Maricar M F , Maricar F , Lopa R T , Hashimoto H
Published: February 2020

Heavy rain causes landslide and debris flow, which produce sediment and woody debris in the mountain river basin. During the process, woody debris and sediment are trapped by the obstacles. As a result, woody debris accumulations at bridges are formed. Trapped woody debris at the bridge caused inundation because the obstacle blocked the water flow in the river course. To get more information regarding the woody debris accumulation at a bridge, laboratory flume was used for experiments to investigate the characteristics of woody debris accumulation at a model bridge without a pier. As a result, the experiments show that the number of trapped wood pieces increases with the number of released pieces. Moreover, the trapped wood pieces caused wood accumulations at the model bridge and backwater rise in its upstream side region. Besides that, the backwater rise increase with a number of trapped wood pieces at the bridges.
Observation pattern of water mass structure at Jeneberang river estuary
Authors: Karamma R , Pallu M S , Thaha M A , Hatta M P
Published: February 2020

This research is a field study conducted in the estuary Jeneberang river. The estuary, the transitional zone formed between the river environment and the marine environment. In this region, there is the mixing of seawater with fresh water that has its own uniqueness with fluctuating salinity. This research aims to see the pattern of salinity distribution and temperature in the area of Jeneberang estuary on the tide and receding conditions. Data retrieval channeled on the area of Jeneberang estuaries with a distance between points 200 m using the ADCP (Acoustic Doppler Current Profiler) and CTD (Conductivity Temperature Depth) tools. The results showed an increase in salinity at Jeneberang estuary, which was influenced by surface and river bed.
Parameters optimization of tuned mass damper using fast multi swarm optimization
Authors: Frans R , Arfiadi Y
Published: February 2020

Tuned mass damper (TMD) has been used for the vibration controller of building, especially for high rise buildings. TMD is one of the passive devices for reducing the response of the structure subjected to dynamic external disturbance such as wind, or earthquake load. TMD used its weight for reducing the vibration, TMD’s frequency is set to the structure’s frequency so that the frequency should be in resonance to each other for reducing the response of the structure during the dynamic load. Therefore, three variables have a significant effect for TMD performance, which are the mass ratio of TMD, the frequency ratio of TMD, and the damping ratio of TMD, which lead to two important variables of TMD properties, stiffness, and damping of TMD. This paper developed an empirical equation for obtaining the optimum parameters of tuned mass damper based on the H2 norm control system and fast multi swarm optimization (FMSO). The objective function was to minimize the acceleration and displacement response of the structure. The result shows a strong correlation both the mass ratio of TMD to the frequency ratio of TMD and the mass ratio of TMD to the damping ratio of TMD.
Relevance between filtration rate and filter media thickness in downflow filter systems
Authors: Adriati Y , Pallu M S , Selintung M , Bakri B
Published: February 2020

One of the simple, easy and inexpensive water treatment technologies is the Sand Filtration technology. Sand Filtration is one of the very small grains of sand as a filter media. This study is an experiment. The objective to be achieved in this study is to analyze the difference in the thickness of the sand filter media to the filtration speed and the amount of filtration discharge, which is the object of research is the raw water of the Departemen engineering Hasanuddin University with treatment using a long reactor 50 cm, width 50 cm and height 150 cm, Down Flow filtering method with sand thickness varies namely 20 cm, 30 cm, 50 cm, besides that it also uses 15 cm gravel and 5 cm fibers. Testing is done by screening, calculating the speed of water through the filter and checking the flow of water. The results were obtained with a thickness of 20 cm sand filtration media resulting in a filtration flow of 0,000199 m3/second with flow rate filtration 0,000794 m/second, a thickness of 30 cm sand filtration media resulting in a filtration flow of 0,000220 m3/second with rate filtration 0.00879 m/second while 50 cm sand produces filtration flow 0,000242 m3/second with rate filtration 0.00969 m/second. It can be concluded by increasing the thickness of the filtration media filtration discharge and filtration speed also increases.
The construction of Karalloe multipurpose dam for the Kellara technical irrigation development
Authors: Hasbi M , Subandi  , Mappanyompa M , Bakri B
Published: February 2020

The problem of Jeneponto regency is a raw water crisis for water drinking and irrigate in dry season. In rainy season, a high sediment to deposit in the lowest area. the regulate flooding and inundates rural and urban. A Jeneponto river is a joint river between Karalloe River and Kellara River which come from Lompo Batang mountain and the existing raw water is not enough to be supplied to the raw water treatment plant and not enough to be supplied to the existing Kellara technical irrigation area so the rice cropping is not optimize although existing Kellara weir and Karalloe weirs will support the irrigation. To solve the problem mentioned above, the Karalloe multipurpose dam will be constructed urgently. The problem will be managed by sustainable integrated water resources management, Step by step method to be applied in 3 terms for example in the short term, the middle term and the long term. Methodology study of this paper focused to solve the raw water crisis and regulate flooding in Jeneponto Regency. The governments apply by not only construction of the Karalloe Dam but also to apply an integrated approach.
Green construction application of the vida view apartment project in Makassar
Authors: Abdurrahman M A , Latief R U , Mustari A S , Mustika L
Published: February 2020

As a developing country, Indonesia has a very rapid infrastructure development which causes the number of construction projects to increase. Green Construction is a reference for construction projects to keep paying attention to environmental sustainability that is attempted by PT. PP (Persero) Tbk. in the construction project of Makassar Vida view Apartment. The Green Construction Assessment (MAGC) model is an assessment standard developed by Ervianto from the Green Contractor Assessment Sheet and GREENSHIP V 1.0. This assessment model was developed in order to know the role of the contractor in applying green construction to the project being handled. This study aims to find out what the application and how much is achieved from PT. PP (Persero) Tbk. in implementing Green construction based on the Green Construction Assessment Model (MAGC). As a result, the Vida View Makassar Apartment Project by PT. PP (Persero) Tbk. has implemented Green Construction in its construction process where this is evidenced by the implementation of 7 aspects of Green Construction by the Green Construction (MAGC) Assessment Model. From the results of the study, Green Construction Value (NGC) data was obtained at 15.83 from a maximum value of 21.92 which is 72.22% of the maximum value. The biggest achievement of NGC for projects in Indonesia is 15.47 and it can be concluded that the achievements achieved by PT. PP (Persero) Tbk. already good at implementing Green Construction.
Identification of construction productivity components in Indonesia. Case study of construction projects at the ministry of public works and housing provision (PUPR)
Authors: Anditiaman N M , Latief R U , Rahim I R , Arifuddin R
Published: February 2020

The problem faced by Indonesia at this time is the lack of information related to supply and demand related to the productivity component, so it needs a study to formulate an index of construction productivity in Indonesia. The analysis of the determination of the productivity component is carried out by the desk study approach with the standard of construction productivity calculation, the standard for construction work financing, and mapping analysis approach based on project technical document data from 3 Unor, namely Water Resources, Highways, and Cipta Karya. The mapping analysis results obtained that the Workforce Component consists of Experts, Skilled Workers, and Non-Skilled Workers, Work Equipment Components include heavy equipment and light equipment and Construction Material Components. Experts for Unor Water Resources consist of Water Resources Experts, Quality Management System, and K3 Construction, Unor Bina Marga, namely Road Engineering, Bridge Engineering, Quality Management System and OHS Construction. Unor Cipta Karya’s experts consist of Environmental and Sanitation Engineering, Environmental Sanitation, Project Management, and Construction Management Experts. Skilled Workers from 3 Unor, namely Supervisors, Measurers, Land Mapping, Road Implementers/Irrigation, and K3 Officers. Non-skilled personnel consist of administrative and financial staff.
Integration conceptual framework of quality management system - occupational safety and health- and environment (QHSE) at PT. Wijaya Karya
Authors: Laksana A H , Arifuddin R , Burhanuddin S , Abdurrahman M A
Published: February 2020

This research is to identify the advantages of integrating quality management systems, Occupational Health and Safety management systems, and Environmental management systems (QHSE Management System). The study was conducted at a State-Owned Enterprises Enterprise. The study will compare All Management Systems with Existing in Wijaya Karya Company with ISO 9001 System on quality management system, ISO 45001 on Health and Safety management system, and ISO 14001 on Environmental management system. The study was conducted by Archive Analysis and Literature studies. Previous literature studies show that the clauses that make up the integration of the QHSE Management System are scope, leadership, policy, planning, support, operations, performance evaluation, and improvement.
The influence of solution pH on the absorption of heavy metals Cr (VI) by Saccharomyces cerevisiae biomass
Authors: Ibrahim R , Djide M N , Lapik C
Published: February 2020

In general, industries produce waste, which causes environmental pollution and is a danger to living things. Chromium heavy metal waste is one type of waste that has high toxicity that can lead to chronic poisoning, acute, and can cause cancer. Biological treatment is a choice to reduce the concentration of heavy metals in environmental media. This study uses a biosorption column that utilizes Saccharomyces cerevisiae bacteria using bacterial biomass made in a state of silence in a continuous column, then flowing Cr (VI) metal solution downflow with a constant flow rate. Laboratory analysis results show that the removal efficiency of Cr (VI) for the initial pH 3 solution is 44.74% - 77.84%, the pH 5 treatment is 7.52% - 30.54% and the pH 7 treatment is 5.80% - 11.40%. The highest removal efficiency occurred at pH 3 of 77.84%. The remaining metal concentrations in the barrel can reduce to 11.08 mg/L.
Chemical composition of green and roasted coffee bean of Gayo arabica civet coffee (kopi luwak)
Authors: Muzaifa M , Hasni D , Febriani  , Patria A , Abubakar A
Published: February 2020

Kopi luwak, is an Indonesian exotic coffee, is known as one of most popular coffee in the world. This coffee is prepared from the finest and ripest coffee berries that are eaten by Asian civet (Paradoxurus hermaphroditus), cat like-animal. The aim of this study was to determine the chemical attributes of kopi luwak both in green and roasted coffee bean. This study conducted by collecting the six samples of kopi luwak from different farms in Gayo Highland, which then processed onto green and roasted coffee beans. The examined parameters are protein, lipid, caffeine and chlorogenic acids. The results of this study showed that the differences existed in chemical attributes of green and roasted of Gayo kopi luwak. The average contents of lipid, protein, caffeine and chlorogenic acids of Gayo arabica kopi luwak in green bean were 12.30%, 13.36%, 1.20% and 3.73%, while in roasted bean were 14.79%, 13.66%, 1.10% and 0.88% respectively. To be conclude with, lipids and caffeine survived during thermal treatments in roasting process, meanwhile chlorogenic acids and protein (N-compunds) are degraded and formed smaller fragments with lower molecular weights.