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U Karst

ukarst
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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.

Arjuna Subject : -

Articles 243 Documents

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Reducing the Risk of Flood Disasters in Lamongan Regency Using the Geographic Information System (GIS) Salwa Nabilah; Nur Azizah Affandy; N. Anwar; M. A. Maulana; N. Nurwatik
U Karst Vol 5, No 2 (2021): NOVEMBER
Publisher : Kadiri University

Flood disasters cause negative impacts, such as damage to facilities to the onset of fatalities. Reducing the risk of flooding needs to be done to reduce the impact caused by this disaster. Lamongan Regency is one of the regencies in East Java affected by floods every year in most of its areas. This study aims to reduce the risk caused by flooding by using GIS (Geographic Information System). Mitigation is done by determining areas with a high potential risk of being affected by flooding. The study used spatial analysis functions in ArcGIS. Supporting variables used rainfall, land cover, slope, soil texture, and watershed area, and it becomes important in determining flood-prone areas. From the results, the largest soil classification is the Kpl soil type. Litosol Gray Grumosol, The wide distribution of rainfall from 1500-1750 mm has the widest distribution is 66,67 ha. The slope of 0-8% has the widest distribution of 92,257 ha, making Lamongan a very vulnerable high flood area. Laren District is the District with the greatest flood potential, and Irrigated Field is the dominant land cover type affected by the flood. With the flood disaster map generated from this research, local governments can seek prevention in areas with high flood potential. They can carry out socialization based on disaster mitigation, especially for districts with potential flooding.

Improving User Comfort Classroom at the Kalimantan Institute of Technology with Maintenance Factors Oryza L Sari; Bobby Zafnat Fanneah Elwore; Basyaruddin Basyaruddin
U Karst Vol 5, No 2 (2021): NOVEMBER
Publisher : Kadiri University

In building construction, the implementation of maintenance activities plays an important role in the quality of the building. By carrying out these activities regularly, it’s hoped to minimize and prevent damage to buildings and make users feel comfortable. Kalimantan Institute of Technology must have comfortable study spaces. This study aims to determine the effect of the class maintenance factor on the user's comfort level. The analysis brought by determining what factors are influencing, these factors influence, and the most dominant factors affecting the most. Primary data was obtained by distributing questionnaires to respondents, secondary data inactive students, and lecturers at the Kalimantan Institute of Technology, and supporting research data in ministerial regulations, books, research journals, and others. The data analysis process uses IBM SPSS as an auxiliary program with multiple linear regression analysis methods. Based on the research and data processing conducted, it’s concluded that 8 factors influence the maintenance, namely the maintenance of user comfort by 80.8% and the variable maintenance of the room walls. The room wall maintenance variable is the most dominant factor influencing the comfort of classroom users. Knowing these factors can implement optimal implementation to support the comfort of class users at the Kalimantan Institute of Technologists.

Easy Way To Determine The Feasibility Of Coarse Aggregate On All Pavement Layers Using The Los Angeles Tatonas TA-700 Machine Mahardi Kamalika Khusna Ali; Agata Iwan Candra; Elsa Rizqi Purwanti; Rikha Wirda Izzati; Kavindo Yugiswara Hutama; Mohammad Roziq; Herlangga Duta Pramudya
U Karst Vol 5, No 2 (2021): NOVEMBER
Publisher : Kadiri University

The use of coarse aggregate with poor quality can cause bumpy roads, cracked roads, potholes, and others. Coarse aggregate wear is an indicator of the aggregate resistance index against friction with other objects. Any aggregate to be used in a pavement mix must meet the wear requirements. Low wear causes the aggregate to be easily crushed when exposed to friction and has an impact on a low level of stability. The purpose of this research is to determine the feasibility of coarse aggregate in Kedak Village, Kediri. One of the feasibility of coarse aggregate is reviewed based on wear with abrasion testing. This research was conducted by using an abrasion test using the Los Angeles TA-700 machine and SNI 2417:2008 as a reference. The specimens were taken at random and met the criteria for passing the number 3/4 sieve and stuck on the 2500 gram sieve number 1/2 and the aggregate that passed the 1/2 sieve was stuck on the 3/8 sieve as much as 2500 grams. The results obtained stated that the average wear of the abrasion test was 26.6%. Based on these results, the aggregate can be said to be feasible because it does not exceed 40% in accordance with the provisions of the 2018 Binamarga General Specifications. So that coarse aggregate from Kedak Village, Kediri can be used for all mixtures of road pavement layers.

Load Transfer On Bored Pile Foundation Instrumented With Fiber Optic And Concrete Quality Analysis Kevin Martandi Setianto; Cecilia Lauw Giok Swan; Paulus Pramono Rahardjo
U Karst Vol 5, No 2 (2021): NOVEMBER
Publisher : Kadiri University

The problem in the construction method of the bored pile is the contamination of mud or the other contaminant that can cause the modulus of elasticity of concrete to decrease. This research determines the modulus of concrete on a bored pile foundation instrumented with fiber-optic (FO) with a manual calculation based on strain data during loading test, validated with the results of research in the laboratory and numerical analysis. Fiber optic was used to measure the strain along with the pile during the loading test. The bored pile foundation is divided into 12 segments with the same strain characteristics, and then the modulus value is calculated. The result is the modulus value of each segment is different, and the value of the modulus changes along with the increase in strain; the modulus will decrease as the strain increases. This differs from the theory that the modulus has a fixed value approximated by empirical equations. Made a cylindrical concrete sample on both sides, which installed a FO to record the strain during the loading test. The result is true that the modulus is not constant but decreases as the strain increases. It is shown in the result of analysis to fiber-optic measurement data. Created a model in Plaxis2D for validation, and the results are not much different from the manual calculation.

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

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.

Waste Concrete as a Substitute for Coarse Aggregate Materials for Compressive Strength of Concrete Fc' 20,75 MPa Bobby Damara; Sugeng Dwi Hartantyo
U Karst Vol 6, No 1 (2022): APRIL
Publisher : Kadiri University

Concrete from construction waste resulting from the construction of new infrastructure replacing old infrastructure can significantly impact the environment. Therefore, there is a need for the proper management of concrete waste. One of the uses of concrete waste is to use it as a coarse aggregate material in the manufacture of Concrete. Using waste concrete is obtaining a material that almost resembles coarse aggregate. This study aimed to determine the optimum content of Concrete with the addition of waste concrete as a substitute for coarse aggregate. This research refers to the standards of SNI and ASTM. The research was conducted by testing the waste concrete to determine whether it is suitable for coarse aggregate material. After that, the compressive strength was tested by curing for 28 days. This research was conducted with 3 samples with 0%, 50%, and 100% of the planned use of concrete waste with concrete compressive strength of Fc' 20,75 MPa. The results showed that the average compressive strength of the 50% concrete waste was 20.59 MPa, and the 100% concrete waste was 13.83 MPa. From these results, it can be seen that the most optimum content of substituted aggregate is a mixture variation of 50%, so the results of this study can be used as a reference in the utilization of recycled concrete waste as a raw material or a substitute for the composition of the concrete mixture.

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

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.

Identifying The Impact Of The COVID-19 Pandemic On The Indonesian Construction Sector Using The Exploratory Factor Analysis (EFA) Cecep Kamiludin; Andreas F.V Roy
U Karst Vol 6, No 1 (2022): APRIL
Publisher : Kadiri University

The COVID-19 pandemic has impacted Indonesia's construction sector. The growth of the construction sector severely declined due to the COVID-19 pandemic. However, the study of the impacts of the COVID-19 pandemic on the construction sector in Indonesia is still limited. The present study is aimed to examine the negative and positive impacts (opportunities) of the COVID-19 pandemic on the Indonesian construction sector. The study employed a quantitative approach with 128 contractors and consultants from 34 provinces in Indonesia. Through the factor analysis (EFA) and USG analysis approach, six negative and positive impacts of the COVID-19 pandemic and their priorities can be identified. The six negative impact factors are Workforce issues and Cost Overruns, Financial Performance Degradation, Project completion delays and schedule disruptions, Supply chain disruptions, Legal and contract issues, and Difficulties in implementing health protocols and adjusting to the standard operating procedure. Meanwhile, the three positive impacts are Increasing awareness of the importance of occupational safety and health and collaboration among stakeholders, Improving the use of technology in the construction sector, and Optimizing existing procedures and systems. The study shows that the pandemic has impacted both the workforce and business entities' business Indonesian construction sector. These findings are expected to be useful in formulating strategic formulation for handling and mitigating the impact of pandemics.

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

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.

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

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).

Page 10 of 25 | Total Record : 243

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Contact Name
Agata Iwan Candra

Contact Email
iwan_candra@unik-kediri.ac.id

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+62811308010

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ukarst@unik-kediri.ac.id

Editorial Address
Jl. Selomangleng no. 1

Location
Kota kediri,

Jawa timur

INDONESIA

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Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name Agata Iwan Candra

Contact Email iwan_candra@unik-kediri.ac.id

Phone +62811308010

Journal Mail Official ukarst@unik-kediri.ac.id

Editorial Address Jl. Selomangleng no. 1

Location Kota kediri, Jawa timur INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Contact Name
Agata Iwan Candra

Contact Email
iwan_candra@unik-kediri.ac.id

Phone
+62811308010

Journal Mail Official
ukarst@unik-kediri.ac.id

Editorial Address
Jl. Selomangleng no. 1

Location
Kota kediri,

Jawa timur

INDONESIA