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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.
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Articles 243 Documents
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Base Course Stabilization Performance Using Fly Ash-Based Geopolymers and Their Effect on Water Quality Standards Rustam Widarto; Latif Budi Suparma; Suprapto Siswosukarto
UKaRsT Vol. 7 No. 1 (2023): APRIL
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v7i2.4235

Abstract

The road is the main gateway to human life and links essential access points. Some structure pavement failures happened due to the base layer's instability. Fly ash has been used in several parts of pavement structures to increase stability. One significant concern with using fly ash in base course stabilization is its proportion and potential impact on water quality standards. This research aimed to evaluate base course stabilization performance using fly ash-based geopolymers, as well as assess their impact on water quality standards. Materials in this study consisted of aggregate, fly ash, water, and alkaline reagent solutions. The variation of mix considered with a variety of alkaline reagents, namely without alkaline reagents, 3 mol, 6 mol, 9 mol, and 12 mol of NaOH. The ratio between NaOH and Na2SiO3 is 1:2. The use of fly ash in the class A aggregate base course layer has not been able to meet specifications. However, by providing 9 mol of alkaline reagent, the strength of the mixture increases so that the CBR value meets the specifications due to geopolymer bonding. When the alkaline reagent solution becomes more concentrated, the optimum water content decreases, and the bond between aggregates strengthens. The effect of alkaline reagents on water quality standards increases the acidity (pH) value, while other parameters such as BOD, COD, and TSS still meet the standards. This research point to another practical approach that is effective in the field to increase the stability of the base course layer and is environmentally friendly.
Increasing Water Capacity Services for South Binjai Community Demand with Intake Pump Mahliza Nasution
UKaRsT Vol. 7 No. 1 (2023): APRIL
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v7i1.4310

Abstract

Indonesia is a country prone to water shortages. Water shortages can affect human well-being and cause disease. This happened in South Binjai Subdistrict, Binjai City, North Sumatra, Indonesia where clean water services were inadequate. Efforts to improve services need to be carried out. This study aimed to evaluate clean water service providers in South Binjai Regency. Evaluation is done by calculating the need for clean water with projected population and customer data. The feasibility analysis of service providers is calculated from the number of people served. So if it does not meet the national standard of 80%, then efforts must be made. The results of the evaluation of service providers in South Binjai District reveal that the coverage of clean water services in 2030 will only reach 17.946%, so service coverage still does not meet national standards. Service providers have limited water capacity. Therefore, the scope of services can be fulfilled by adding operational tools for taking clean water sources such as water pumps. The proposed strategy is to take water from the Bingei River with eight intake pump capacity of 6.25 l/s. The total cost of procuring these pumps in 10 years is IDR 1,529,280,000. Adding the intake pump can increase the water capacity up to 125%. The results of this study can be used as an effort to meet clean water needs in the future.
Grid Satellite Rainfall Products Potential Application for Developing I-D and E-D Thresholds for Landslide Early Alert System over Bali Island Putu Aryastana
UKaRsT Vol. 7 No. 1 (2023): APRIL
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v7i1.4318

Abstract

Bali has been one of the most popular tourist destinations in Indonesia. However, on the other hand, Bali has a high risk of natural disaster vulnerability. The number of landslides in Bali took the first position compared to other natural disasters. Currently, remote sensing platforms can present Grid Satellite Rainfall Products (GSRPs), which provide rainfall information that can identify rainfall conditions for landslide events. This study aims to analyze the potential GSRPs application of Precipitation Estimation from Remotely Sensed Information Using Artificial Neural Networks (PERSIANN), the Integrated Multi-satellite Retrievals for Global Precipitation Measurement (IMERG), and Global Satellite Mapping of Precipitation (GSMaP) in determining the mean rainfall intensities and duration (I-D); accumulated rainfall and duration (E-D) thresholds for landslide occurrences over Bali Island. The method used to develop I-D and E-D thresholds is the power-law equation and frequentist sampling method in various probability levels (5%, 10%, 20%, 30%, 40%, and 50%). The result shows that I-D and E-D thresholds established by GSRPs are generally lower than the threshold defined by rain gauge observations. Among the three GSRPs, IMERG is performing the best in establishing the I-D and E-D thresholds for landslide phenomena. The level of potential that IMERG can use in developing the I-D and E-D thresholds is 59.16% and 84.06%, respectively. The E-D threshold derived from the IMERG product can be used to establish the landslide early alert system over Bali Island because it has a high spatial-temporal resolution, word-wide coverage, and near-real-time observation.
Fulfillment of Clean Water Needs in Tamangil Nuhuten Village with Addition of New Spring Paschal Rumihin; Soebagio Soebagio
UKaRsT Vol. 7 No. 1 (2023): APRIL
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v7i2.4464

Abstract

Seventy-two million Indonesians have difficulty accessing clean water, especially in rural communities. This causes various diseases and has an impact on people's welfare. Currently, the community's need for clean water in Tamangil Nuhuten Village depends on the Wiak spring and often experiences shortages. This research aims to analyze the need and availability of clean water in Tamangil Nuhuten Village. The need for clean water is calculated using water consumption data and the projected population. As for water availability, the water source discharge data is collected from the government and measures the water discharge directly to validate the data. It is necessary to analyze the water balance to determine the ability to meet the demand for clean water. The results showed that the need for clean water for the next 10 years is 2.0 liters/second, while the water supply is 1.06 liters/second, so it is still insufficient. Fulfillment can be done by adding the Baluruk spring 1.8 km away. Baluruk Spring can discharge of 83.3 liters/second with constant conditions throughout the year and meets clean water quality. Intake of clean water can be done by building two reservoirs to reduce the sediment content with dimensions of 4m x 6m x 3m, which are placed 500m from the village. As well as used two 6-inch pipes for transmission pipes and one 4-inch pipe for distribution. Thus the water needs of the Tamangil Nuhuten Village community can be fulfilled until 2031.
Design of Irrigation Channel Network Connectivity and Tertiary Channels in Menten Village, Rambutan District South Sumatra to Optimize Agricultural Land Sakura Yulia Iryani; Agus Lestari Yuono; Regina BR Manalu; Reini Silvia Ilmiaty
UKaRsT Vol. 7 No. 1 (2023): APRIL
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v7i1.4481

Abstract

South Sumatra Province is a province that is flowed by many rivers, including the Musi River, the longest river on the island of Sumatra. The condition of inadequate irrigation infrastructure means that farmers in Menten Village can only plant one crop per year. This study aimed to determine the irrigation water needs of tertiary canals and design the dimensions of connectivity and tertiary channels.  Repairing the irrigation network in the village is planned to increase the productivity of agricultural land to two plantings in one year with a cropping pattern of rice and crops. This research was conducted following the following stages Calculation of Irrigation Water Needs, Calculation of Surface Runoff Discharge, Calculation of Channels Design Discharge, Calculation and determination of the dimensions of Connectivity and Tertiary Irrigation Channels. The study results obtained a Need Field Requirement (NFR) value of 1.572 l/s/ha with a maximum irrigation water requirement of 2.418 l/s.ha. To increase menten agricultural yields, a planting pattern of 2 times is planned. The planned channel is an open trapezoidal channel that functions as a carrier channel and a discharge channel namely rice and crops. There are three connectivity irrigation channels. While there are 25 tertiary irrigation canals. The results of this research can be used reference to improve irrigation systems that are still not optimal.
The Construction of a Gravity Retaining Wall to Prevent Landslides on the Grogol Kediri Highway Norazlan Khalid; Adnan Derahman; Raudhah Razali; Noor Azreena Kamaluddin
UKaRsT Vol. 7 No. 1 (2023): APRIL
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v7i1.4554

Abstract

One proof of Kediri's progress is the construction of Doho Kediri International Airport which is expected to improve the economy and tourism in this city. The airport was built with the aim of improving connectivity and suppressing development disparities in southern East Java. The purpose of this study is to plan the construction of an earthquake-resistant which is gravity retaining wall on the Grogol Kediri Highway, Kediri Regency. . Planning is carried out at STA 3.8-4.0. ,  soil laboratory testing on samples obtained from the studied location.  Identification of the soil type, sliding angle, and weight of the soil volume at the site are needed to determine the planning of earthquake-resistant retaining walls. From the soil properties obtained, it can be determined that the land is included in the GC (Clayey Gravel) category With a shear angle of 28° and a weight of 1.463 gr/cm3. These results were used to calculate the dimensions and the stability of the retaining wall using the Coulomb method.  The retaining wall should have a peak body width of 1 meter, foundation width of 3.8 meters, foundation thickness of 1 meter, foundation depth of 1.04 meters, foot and heel width of 0.9 meters, height of 6 meters, and bottom body thickness of 2 meters. Based on stability calculations, the retaining wall is safe against overturning, shifting, and subsidence. Therefore, this retaining wall is a viable solution to prevent landslides and mitigate the negative impacts caused by them.
Discrete Element Method Approach to Simulate Cracks in Four-Point Flexural Test Faqih Ma arif; Slamet Widodo; Maris Setyo Nugroho; Zhengguo Gao
UKaRsT Vol. 7 No. 1 (2023): APRIL
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v7i1.4401

Abstract

Concrete is a material that is widely used in construction. Concrete research efforts are ongoing and through a series of experimental tests. On the other hand, experimental tests require a lot of money, take a long time, and create waste. Several studies have revealed that numerical testing can accurately test concrete to fractures. However, modeling for the four-point load flexure test pattern is still not widely discussed. This study aimed to model the four-point flexural test of concrete using the discrete element method (DEM) approach. Sieve gradation was performed to determine particle size, and flexure testing was performed to calibrate the DEM model. DEM flexure testing was made using Yet Another Dynamic Engine (YADE) software with ASTM D6272 reference and beam dimensions 105 x 105 x 535 mm. The cohesive contact model with spherical particles is used, and the algorithm developed modifies the faceted sphere of interaction. The study results revealed that DEM can simulate crack behavior in flexural testing of unreinforced concrete. The DEM results show only a 2.13% difference in the experimental results of the flexural strength test. Meanwhile, crack behavior can be observed directly in the DEM simulation. The results of this study can be used to predict the failure pattern of the flexural test structure and to design the right proportion of the mixture to match the desired flexural strength. So that material efficiency and concrete flexure testing time can be achieved.
RETRACTED: Construction Schedule Management for Densely Populated Areas Using CPM-Crashing Tsulis Iq'bal Khairul Amar; Fresti Febria Astuti; Vivi Tri Wulandari
UKaRsT Vol. 7 No. 2 (2023): NOVEMBER
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v7i2.4815

Abstract

This article has been retracted: please see U Karst Policy on Article Withdrawal. (https://ojs.unik-kediri.ac.id/index.php/ukarst/article-retraction) This article has been retracted at the request of the Editor-in-Chief. This decision was taken because it was discovered that almost the same article had been published earlier on October 31, 2023, in the Jurnal Teknik Sipil: Rancang Bangun (https://ejournal.um-sorong.ac.id/index.php/rancangbangun/article/view/2632). The author was identified as having made multiple submissions, namely submitting a manuscript in the U Karst Journal on July 3, 2023, and also submitting almost the same manuscript in the Jurnal Teknik Sipil: Rancang Bangun on August 24, 2023. The Editors deplore the practice of simultaneous multiple submissions of papers to different journals. As such this article represents a severe abuse of the scientific publishing system. The scientific community takes a very strong view on this matter, and we apologize to the journal readers that this was not detected during the submission process.
Evaluating Differences in Foundation Depth Planning and Implementation for Building Structure Safety Sheila Ananda Putri Pertiwi; Agata Iwan Candra; Rama Putra Nugraha; Tiara Sherlyta Sari; Wiwit Mely Yanti Jannah; M. Faisol Firmansyah; Mohammad Agus Fajar Wibowo
UKaRsT Vol. 7 No. 2 (2023): NOVEMBER
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v7i2.4955

Abstract

Kediri has been named the Most Sustainable City. To support this, Kadiri University also contributed by building lecture buildings. In its implementation, there is a difference in the depth of the foundation from the initial plan. This causes the need for evaluation to ensure the safety of the building structure. This research aims to identify (Cone Penetration Test) CPT distances, depth differences, negative skin friction, settlement, and empirical bearing capacity calculations on the safety of building structures on sandy soil. The direct observation method was used to obtain data. The analysis includes a comparison of depth, negative skin friction values, settlement, and bearing capacity. The research results show that the average CPT distance is 18.22 m, which can result in inaccurate CPT data because differences in soil structure can occur. A depth difference of 22% from the plan can be considered safe for the structure. This is validated by a field settlement of 2 mm lower than the maximum settlement limit and a Negative skin friction value of 0, indicating no additional settlement. These parameters indicate that the structure is safe. The modified Meyerhoff and Trofimankove methods are suitable for planning foundations with sandy soil because they can meet the load received. This research can add empirical evidence in evaluating structural safety for different depths of foundation planning and implementation in sandy soil-based projects, as well as reducing the potential risk of structural failure in the long term.
Investigation and Slope Improvement of Landslides on Bodor River Slopes Ma’rifatul Mumayyizah; Agata Iwan Candra; Alfina Iskindaria; Farikhatul Mufaidah; M. Risjad Aldiansyah
UKaRsT Vol. 7 No. 2 (2023): NOVEMBER
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v7i2.5031

Abstract

The Bodor River is an important source of rice irrigation because most of the population works in the agricultural sector. The slopes of the Bodor River have experienced landslides, causing a major negative impact on the community. Many studies state that soil type, consistency, and friction angle influence slope failure. However, the relationship between soil characteristics and landslides on slopes, especially on the Bodor River, has not been studied. This research aims to identify soil characteristics and their influence on landslides on the slopes of the Bodor River, along with recommendations for improvement. The soil was taken after a landslide occurred at a depth of 80 cm for a sieve gradation test, Atterberg limit test, direct shear test, and slope stability analysis using the Cullman method. The research results show that the SW-SM soil type on the slopes of the Bodor River is highly vulnerable to landslides. A steep slope of 50° and a low soil friction angle between 1.38 and 14.11 have less than one safety factor. Changes in soil conditions, such as increased water content, contribute to a higher risk of landslides. Therefore, strengthening the slope is necessary, with the recommendation to increase the slope to 34.5° so that the slope safety factor increases by 73%. The results of this research provide an overview of the relationship between geotechnical soil parameters that influence slope failure in river areas and recommendations for slope improvement to prevent future collapse.

Page 24 of 25 | Total Record : 243

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