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Agata Iwan Candra
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U Karst
Published by Universitas Kadiri
ISSN : 25794620     EISSN : 25810855     DOI : http://dx.doi.org/10.30737/ukarst
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture
U KaRsT is a journal of the civil engineering research the University of Kadiri published twice a year in April and November. First published in April 2017. U KaRsT already has both ISSN printed and online, for ISSN (Print) is 2579-4620, and ISSN (Online) is 2581-0855.
Arjuna Subject : -
Articles 264 Documents
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Determining the Type Of Skybridge From The Bojonggede Station to The Bojonggede Terminal Considering The Traffic Impact Sofian Ari Saputra; Rinda Karlinasari; Rachmat Mudiyono
U Karst Vol. 6 No. 1 (2022): APRIL
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v6i1.2386

Abstract

Bojonggede Station, located in Bogor Regency, is one of the KRL stations used to support the mobility of the surrounding community. This makes Bojonggede station a place with quite complex transportation problems. From the various problems that occur, this research aims to find the right sky bridge to connect the bojonggede station with the bojonggedeTerminall and reduce the impact of traffic in the surrounding location after the sky bridge. The data analysis method used is the 4 step model method consisting of trip generation/attraction, trip distribution, mode selection (Moda Split), trip assist, Indonesian road capacity manual, and descriptive analysis of survey data on visitors Bojonggede station. From the results of the analysis based on the 4 step model and manual of Indonesian road capacity, it is found that the performance of the Bojonggede 2 highway, which is in front of the location, has increased from LOS F during the construction period to LOS C during the sky bridge operations bridged. The benefit of this research is that it can be seen that traffic problems that occur at the study site can be overcome by the existence of an efficient sky bridge design sky bridges Bojonggede station with Bojonggede Terminal, to be further recommended to the Bogor district transportation office, and the Jabodetabek transportation management center ( BPTJ).
Cyclist Safety and Comfort of Bicycle Facilities in the Bintaro Jaya During Covid-19 Pandemic Using Bicycle Level of Service Fredy Jhon Philip Sitorus; Galih Wulandari Subagyo; Rio Yohanes Nikijuluw
U Karst Vol. 6 No. 1 (2022): APRIL
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v6i1.2393

Abstract

Limited cycling facilities are one of the problems that often occur in urban areas in Indonesia, especially Bintaro Jaya, an area that cyclists often traverse during the COVID-19 period as it is today. The lack of service level of bicycle facilities on Jl. Boulevard Bintaro Jaya often causes bicycle users to feel less safe and comfortable during cycling. This study was conducted to know the service of bicycle facilities in Bintaro, especially on jl. Boulevard Bintaro Jaya. The most affecting factor of the service level of bicycle facilities in Bintaro is the high volume of traffic. One of the first steps to knowing the level of service of bicycle facilities is to analyze using the bicycle level of service (BLOS) method. In addition, a questionnaire will be conducted to determine the perception of bicycle facility users in Bintaro. Observations on traffic characteristics are carried out on weekdays and weekends, which are then to obtain BLOS data. Analysis was performed that BLOS values above 3.5 which mean the bike is not feasible for cyclists. The results concluded that the bicycle facilities in Bintaro Jaya are still not by the safety and comfort factors according to the BLOS method. To improve the safety and comfort of cyclists, the application of traffic calm such as speed hum is needed to reduce the impact of high traffic volume and high speed, repainting of markings and adding bicycle parking facilities.
Dimension Analysis Of The Emergency Spillway Of Tirawan Dam With The Application Of The System Dynamic Model Awan Risdiyanto; Adi Prawito
U Karst Vol. 6 No. 1 (2022): APRIL
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v6i1.2477

Abstract

Tirawan Dam emergency spillway is planned to be able to drain the initial flood discharge when the gate above the main spillway is closed so that there will be sufficient time to open the gate to pass the peak flood discharge through the spillway safely. The emergency spillway elevation is designed to accommodate maximum water as a natural reserve during the dry season. This study aims to analyze the factors that play a role in emergency spillway design in meeting the availability of optimal raw water storage and increasing the safety factor against flooding using a simulation modeling method with the help of the Vensim PLE program. The modeling is made in three stages. The first is the analysis of the system model, the second is the creation of a caustic diagram, and the third stage is the simulation of the model and scenario model. The simulation results of this model scenario obtained an effective emergency spillway elevation of +69.50 m and a width of 20 m. The spillway can pass the Q1000 design flood without the control gate operation with a freeboard of 0.41 m with a raw water reserve of 240,649.69 m3. From the simulation results, it is also known that the operation of the main spillway serves to add a safety factor to the discharge capacity of the flood discharge during an emergency condition and cannot be operated to optimize the reservoir.
Curtain Grouting To Reduce Seepage Foundation Access Road To The Top Of The Dam At Tugu Dam Supriono Supriono; Agata Iwan Candra; Yosef Cahyo Setianto Poernomo; Mochammad Danara Indra Pradigta
U Karst Vol. 6 No. 1 (2022): APRIL
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v6i1.2479

Abstract

The construction of a complementary access road to the top of the dam is to the left of the Tugu dam pedestal. Based on geological studies, it is feared that there is a potential for seepage that passes through the left pedestal through joints, fractures, and fault areas/rock layers below the foundation surface. To anticipate this, the allowable seepage requirement is the lugeon value (Lu) < 3. This study aims to determine the geological conditions and the amount of seepage before and after foundation repairs are carried out using the grouting method. The type of this research is field research, qualitative descriptive because this research tries to collect lugeon population and cement material absorbed into the rock from water pressure test and grouting injection work by grouping each type of hole, pilot hole, primary hole, secondary hole, tertiary hole, and check hole. The study results by taking rock cores found that the constituent rocks were volcanic breccia units and colluvial rocks. Furthermore, a water pressure test before grouting with a water passing value of (k) = 6.62E-05 to 4.73E-04 cm/sec or with a lugeon value (Lu) of 5.07 to 36.21. After repairing the foundation using rim curtain grouting, the seepage that occurs decreases with a water passing value (k) = 1.96E-05 to 3.03E-05 cm/sec or lugeon (Lu) 1.50 to 2.32, so the requirements the target value of Lu < 3 was achieved with the effectiveness in the good category.
Optimization of Compressive Strength and Porosity of Normal Concrete Using Fly Ash and Alkaline Activators Wahyu Kartini; Made Dharma Astawa; Hendra Setiawan
U Karst Vol. 6 No. 1 (2022): APRIL
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v6i1.2481

Abstract

The use of cement in the concrete mix is the most expensive material. In the cement production process, there is CO2 emission into the air, which causes the greenhouse effect and global warming. So we need other materials as an alternative to reduce the use of cement by using by-products such as fly ash which is categorized as a Pozzolan material. In this study, fly ash was used with variations of 0%, 70%, 80%, 90%, 100%, water-cement ratio 0.4. Because fly ash does not have the same binding ability as cement, alkaline activators are needed, namely Sodium Silicate (Na2SiO3) and Sodium Hydroxide (NaOH)  , with molarities of 6M and 8M. To determine the compressive strength of concrete, a compressive test was carried out at the age of 7 days and 28 days and a porosity test at the age of 28 days. The maximum compressive strength of concrete with fly ash content of 90% with a molarity of 6M and 8M. The age compressive strength has the same value. At the age of 7 days is 14.43 MPa. At the age of 28 days, it is 18.39 MPa. The greater the use of fly ash and molarity in concrete, the fewer pores in the concrete because the mixture is more concentrated and round, and the small particle size of fly ash can fill voids in the concrete.
Monitoring of Substructure Building of Suramadu Bridge Causeway Segment on Surabaya Side Based on Corrosion Level Ari Setijorini; Anik Ratnaningsih; Krisnamurti Krisnamurti
U Karst Vol. 6 No. 1 (2022): APRIL
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v6i1.2499

Abstract

The structure of the steel pile foundation for the Suramadu Bridge crossroad is located in a corrosive marine area. Air humidity, rainwater, mud, or friction with other objects that cause the protective layer to peel off. Corrosion monitoring is carried out to determine the corrosion rate as one of the steps to prevent corrosion. This study aims to evaluate and monitor the bridge's structure Suramadu Causeway. The evaluation carried out includes observing the damage caused by corrosion. So that it will be known the cause of corrosion and the handling of corrosion protection in the building under the bridge, this study used primary and secondary data collection methods and visual observation of damage from routine inspections carried out. The observations show that the condition of the piles is filled with marine life in the tidal area, while for areas that have never been submerged the condition is quite good. The value of the condition of the structural elements at level 3 - 5, which requires protection on steel pillars that have suffered a lot of damage—handling that needs to be done in the Atmospheric zone and Splash zone / Tidal zone is recommended Recoating, Wrapping, HDPE Jacketing, Epoxy Grouting. In the Submerged zone and the Embedded zone, it is recommended that the Cathodic Protection be replaced (120 kg for 600 mm). So from the results of the research that has been done, it can be used as a study for the maintenance of the Suramadu bridge in preventing corrosion.
Optimizing Performance Asphalt Concrete Hot Rolled Sheet– Wearing Course (HRS-WC) Using Chitosan Powder Jenny Caroline; Maritha Nilam Kusuma
U Karst Vol. 6 No. 1 (2022): APRIL
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v6i1.2545

Abstract

Road quality is also affected by temperature and weather, leading to surface pavement deformation. It is necessary to improve the quality of the road pavement so that the quality of the road becomes more durable and stable. Hot Rolled Sheet – Wearing Course (HRS-WC) is flexible and has high durability. The natural mineral has been used as the filler for pavement construction. However, further research is necessary to obtain alternative and more sustainable materials. This study will discuss portland cement filler as a reference to compare filler replacement with chitosan powder (shellfish) based on the general specifications of the 2018 highway revision 3 division 6. Chitosan powder contains calcium oxide of 3.04%  and silica oxide of 17.98%, which are similar to cement fillers. The composition of chitosan powder are 100%: 0%, 50%: 50%, 25%: 75%, and 0%: 100%. performance analysis is done through the marshall test. The results showed that the comparison of the use of the best chitosan powder was at the asphalt content of 7.3 with 50% : 50% with a marshall test value of 993.4 kg, flow 3.20 %, VMA 18.36%, VFB 72.01%, VIM 5.14, MQ 301.440 kg/mm. From the result which meets the requirement, the filler has shown quality improvement as an additional mixture according to (SNI 03-6723-2002). Hence still not optimal to replace portland cement because, from the value of the marshall test, portland cement has a higher marshall value than chitosan.
Analytical Hierarchy Process (AHP) for Maintenance Management at Bali Mandara Hospital Maria Imaculata Goran Mosa; I Nengah Sinarta; I Gusti Agung Putu Eryani
U Karst Vol. 6 No. 2 (2022): NOVEMBER
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v6i2.2684

Abstract

The absence of an assessment of the level of damage and the condition of the Bali Mandara Hospital building makes the maintenance management plan contained in the umbrella contract only based on the damage that occurred in the previous year. Therefore, it is very difficult to determine which building infrastructure components require maintenance and repair first. This study examines the priority scale of infrastructure maintenance at Bali Mandara Hospital using the Analytical Hierarchy Process (AHP). In this study, researchers used a quantitative-descriptive approach. The assessment of the building condition index value is then determined by the priority scale of each component using the Analytical Hierarchy Process (AHP) method with the help of the Expert Choice Version 11 application and the SWOT Method. The results showed that the index value for the infrastructure condition of the Bali Mandara Hospital building was 89.492 with very good condition criteria and was in zone I, while the highest priority scale was faucets, namely 1,000, and the lowest priority was action on a scale of 0.050, where this priority scale can be used in planning. Standard Operating Procedure (SOP) and efficient maintenance management. So based on the results of this study, with SWOT analysis, maintenance management can develop a more effective and efficient maintenance plan and Standard Operating Procedure (SOP) by the building condition index and existing priority scale.
Rationalization of Rainfall Station Network in Welang Watershed Using Kagan-Rodda Method Safira Anisah Haromain; Sri Wahyuni; Lily Montarcih Limantara
U Karst Vol. 6 No. 2 (2022): NOVEMBER
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v6i2.2829

Abstract

Rationalizing rainfall station is important to get an effective and efficient number and distribution of rainfall stations. If rationalization isn’t carried out, it affect to operating and maintenance costs of rainfall stations and accuracy of data. This study aimed to evaluate existing rainfall station and rationalize rainfall station, so rainfall station’s location is evenly distributed. This study is located in Welang watershed with an area 477.78 km2. This research requires rainfall ground data from 9 rainfall stations and CHIRPS satellite rainfall data from Google Earth Engine. The data is tested with consistency, stationary, suitability, and rationalization based on World Meteorological Organization (WMO) standards and Kagan-Rodda method. Later, new rainfall station networks will be obtained with the influence area of rainfall stations suitable to WMO Standard. CHIRPS data is highly suitable with ground data, proven by high NSE, strong correlation, and low relative error, so CHIRPS data can be used for further analysis. According WMO, only 1 rainfall station in Welang watershed has been suitable for WMO standard. Those unsuitable with WMO standards need to be rationalized. Based rationalization results, with average error <10%, Welang watershed requires 4 rainfall stations by maintaining Lawang Station, moving Telebuk to Station B, Selowongko to Station C, and Tutur to Station D. The influence area of recommendation rainfall stations have been suitable to WMO Standards and obtained even distribution rainfall stations. This recommendation are expected to be considered by relevant institutes to move the location of the rainfall station to get more accurate rainfall data.
Tsunami Mitigation Strategy at Watu Ulo Beach Based on Numerical Modeling Using Delft3D-Flow Risqi Sofiana; Retno Utami Agung Wiyono; Indra Nurtjahjaningtyas
U Karst Vol. 6 No. 2 (2022): NOVEMBER
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v6i2.2959

Abstract

The coastal area of Watu Ulo Beach in Jember has great resource potential but also the potential for major disasters, such as a tsunami. Tsunamis can cause casualties and destroy buildings. Thus, it is important to assess the possibility of future tsunami disasters. This study aims to simulate a tsunami at Watu Ulo Beach using Delft3D-Flow to analyze the possibility of affected areas. The tsunami modeling is based on two simulations, namely Scenario 1 as model validation using the characteristics of the 1994 Banyuwangi earthquake. Model validation calculation uses the MAPE method <10%. Scenario 2, modeling the southern Java megathrust earthquake, was analyzed to obtain the time and wave height as well as tsunami run-up and inundation, visualizing the area affected by Watu Ulo Beach. The simulation results show that the tsunami wave height at Watu Ulo Beach reached 12.57 m with a travel time of 29 minutes. The run-up elevation was 9.21 m, and the inundation distance was 2.38 km from the Watu Ulo coastline, indicating that the tsunami caused substantial damage. As an area affected by the tsunami, Sumberejo Village has an inundation area of 634.68 ha, and Sabrang Village has an area of 250.03 ha. The temporary evacuation location for Watu Ulo Beach is set at Tanjung Papuma Street via the shortest route of 0.57 km from the assembly point. Based on the results of this study can be used as a reference for determining temporary evacuation routes and locations for tsunami disaster mitigation in coastal areas.

Page 22 of 27 | Total Record : 264

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