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5th International Conference on Rehabilitation and Maintenance in civil engineering, ICRMCE 2021

作者： Kencanawati, Ni Nyoman Murtiadi, Suryawan Nur, Zul Aida Postgraduate Study Program of Civil Engineering Mataram University Jl. Majapahit 62 Mataram83125 Indonesia

ISBN: (纸本)9789811693472

Concrete properties change when it is exposed to high temperature. Fire can reduce the strength and the stiffness of the concrete. Another visible thing is the change in the color of the concrete. Furthermore, a decrease in the alkaline degree of concrete can also occur at high temperatures. This study combines quantifying the value of the color change, quantifying the alkaline level, and evaluating the residual strength of post-fire concrete. Two concrete grades were prepared: 25 and 45 MPa and exposed to a high temperature of 300 and 700 ℃. The amount of 1.8, 2 and 2.5 kg/m3 of polypropylene fiber were added to the concrete. According to the temperature rise analysis, the farther the position from the concrete surface causes a decrease in temperature. The 2.5 kg/m3 fiber content shows more excellent post-fire mechanical performance because it provides the pores needed by concrete when water vapor pressure occurs due to high temperature;therefore, cracks in the cement paste can be avoided. Visually, the color change between grade 25 and 45 MPa are the same in each temperature;however, they have different coordinates as observed by the color test. Furthermore, the addition of 2.5 kg/m3 fiber to the concrete contributes a superior effect to prevent the decrease of the alkaline level during the fire. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Polypropylenes

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Investigation of the immersion resistance of the HRS-WC mixtures with applying static loading 7

Investigation of the immersion resistance of the HRS-WC mixt...

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7th International Conference on engineering, Technology, and Industrial Application, ICETIA 2020

作者： Sunarjono, S. Hidayati, N. Magfirona, A. Prakoso, A.D. Civil Engineering Postgraduate Program Universitas Muhammadiyah Surakarta Indonesia Civil Engineering Study Program Universitas Muhammadiyah Surakarta Indonesia

The inclusion of rainwater often compounds the damage to the road before reaching the plan life through the surface and shoulders of roads. This can lead to the release of aggregates and exfoliation of asphalt on the surface layer. The study aims to determine the level of road durability against the Marshall, volumetric, and durability properties of the HRS-WC mixture. The study used various static loading 100 Kpa, 150 Kpa, and 200 Kpa with immersion. In the immersion method, there are two differences, namely, immersion with and immersion without loading. The test objects' loading using a simple and economical test tool utilizes the beams and iron cylinders obtained from the laboratory, testing using Marshall Test. The results of the analysis obtained the durability of unloading soaked value higher than the load. The analysis results showed that the durability of the mixture was soaked seven days with a load of 100 KPa was 77.40%, for 150 Kpa amounted to 52.02%, and for 200 KPa, which is 47.67%. Analysis results showed a 7-day immersion value with a cumulative load of 68.38%, while analysis results showed a seven day immersion value with periodic loading of 75.43%. © Published under licence by IOP Publishing Ltd.

关键词： Durability

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Biosorption of chromium by live and dead cells of Bacillus nitratireducens isolated from textile effluent

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Chemosphere 2024年 359卷 142389页

作者： Imron, Muhammad Fauzul Setiawan, Wahyu Putranto, Trisnadi Widyaleksono Catur Abdullah, Siti Rozaimah Sheikh Kurniawan, Setyo Budi Study Program of Environmental Engineering Department of Biology Faculty of Science and Technology Universitas Airlangga Campus C UNAIR Jalan Mulyorejo Surabaya60115 Indonesia Department of Water Management Faculty of Civil Engineering and Geosciences Delft University of Technology Stevinweg 1 CN Delft2628 Netherlands Study Program of Environmental Science Postgraduate Program Sriwijaya University Palembang30139 Indonesia Department of Chemical and Process Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia UKM Bangi Selangor 43600 Malaysia

Bacillus nitratireducens was isolated from textile effluent and showed high tolerance to chromium (Cr), reaching up to a 1000 mg/L MIC value. This research was aimed at utilizing biosorbents from live and dead cells of B. nitratireducens to remove Cr from an aqueous solution. A batch biosorption test was performed, and mechanisms analysis was approached by an adsorption-desorption test, SEM-EDS, and FTIR analysis. Cr removal by dead cells in 25, 50, and 100 mg/L of Cr were 58.99 ± 0.7%, 69.8 ± 0.2%, and 82.87 ± 0.11%, respectively, while that by live cells was 73.08 ± 1.9%, 80.27 ± 6.33%, and 86.17 ± 1.93%, respectively. Live cells showed significantly higher Cr removal and adsorption capacities as compared to dead cells. In all concentrations, absorption contributed more than adsorption to the Cr removal by both live and dead cells. Absorption of Cr was subjected to occur due to passive mechanisms in dead cells while involving some active mechanisms in live cells. SEM-EDS confirmed the detection of Cr on the cell surface, while FTIR revealed the shifting of some peaks after the biosorption test, suggesting interactions between Cr and functional groups. Further TEM analysis is suggested to be conducted as a future approach to reveal the inner structure of cells and confirm the involvement of absorption mechanisms. © 2024 Elsevier Ltd

关键词： Heavy metals

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Laboratory test on pullout capacity of winged box anchor for expansive soil

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AIP Conference Proceedings 2024年第1期3145卷

作者： Tiorivaldi Tiorivaldi Yusep Muslih Purwana Bambang Setiawan Civil Engineering Department Faculty of Engineering Universitas Sebelas Maret Surakarta Indonesia Civil Engineering Postgraduate Study Program Faculty of Engineering Surakarta Indonesia

Expansive soil is one type of problematic soil, overly sensitive to changes in moisture content. This soil has the characteristics of large shrinkage expansion due to changes in pore volume which can cause lifting forces on existing construction can cause damage to the construction. This research aims to analyze the tensile capacity by using a winged box anchor against expansive soil expected to overcome the problem of swelling in expansive soil. The research was conducted experimentally at the Soil Mechanics Laboratory of Sebelas Maret University Surakarta. The materials used in this test were sand and expansive soil taken from Sambungmacan, Sragen, Central Java. The main test equipment used in this test is a steel cylindrical tube. A winged box anchor with a size of 7x7x30 cm is embedded in a steel cylindrical tube containing 75 cm of sand in the bottom layer and 25 cm of expansive soil in the top layer. Then the expansive soil is gradually moistened with water until it reaches a moisture content of 50% to determine its effect on the swelling value. The results of this modeling show that the winged box anchors are promising to reduce the swelling behavior of expansive soil.

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Investigation of the immersion resistance of the HRS-WC mixtures with applying static loading

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Journal of Physics: Conference Series 2021年第1期1858卷

作者： S Sunarjono N Hidayati A Magfirona AD Prakoso Civil Engineering Postgraduate Program Universitas Muhammadiyah Surakarta Indonesia Civil Engineering Study Program Universitas Muhammadiyah Surakarta Indonesia

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Impact of infrastructure development jalur jalan lintas selatan (jjls) in Yogyakarta to change in land price

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IOP Conference Series: Earth and Environmental Science 2021年第1期683卷

作者： H Edy M Baiquni B Triatmodjo Doctoral Student in Environmental Sciences Doctoral Study Program Postgraduate School of Universitas Gadjah Mada Lecturer in Doctoral Program in Environmental Sciences Postgraduate School of Universitas Gadjah Mada and Lecturer in Regional Development Study Program at the Faculty of Geography Universitas Gadjah Mada Lecturer in Doctoral Program in Environmental Sciences Postgraduate School of Universitas Gadjah Mada and Lecturer in Civil Engineering Study Program Faculty of Engineering Universitas Gadjah Mada

The Southern Trans-Java Route (Jalur Jalan Lintas Selatan – JJLS) infrastructure development is a national program that goes through five provinces in the island of Java, namely the provinces of East Java, Central Java, Yogyakarta Special Region, West Java, and Banten. In Yogyakarta, the Southern Trans-Java Route (JJLS) cuts across three regencies, which are Gunungkidul Regency, Bantul Regency, and Kulonprogo Regency. This research selected locations in Jetis Village, Saptosari District, Gunungkidul Regency, Gadingsari Village, Sanden District, Bantul Regency, and Sindutan Village, Temon District, Kulonprogro Regency for its study. The aims of this research are to analyze price changes that occur. The research method employed in this study is the qualitative descriptive analysis method. The villages set as study locations were determined by purposive method and data collection was conducted through in-depth interviews with informants who understand the issues relevant to the research objectives. Based on the acquired study results, the highest change in land price took place in Sindutan Village. A significant increase in land price occurred.

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Seismic risk for Sumbawa Island based on seismicity and peak ground acceleration

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IOP Conference Series: Earth and Environmental Science 2020年第1期413卷

作者： C B Santoso D S Agustawijaya Postgraduate Study Program in Civil Engineering Universitas Mataram Indonesia Department of Civil Engineering Universitas Mataram Indonesia

Sumbawa Island, West Nusa Tenggara Province, is one of the regions in Indonesia that has a relatively moderate to high seismic activity because the area is flanked by two earthquake sources. These two sources cause an area prone to earthquake hazards. This research aims to determine the seismic risk in Sumbawa Island based on seismicity and Peak Ground Acceleration (PGA) value. The results of Gutenberg-Richter parameters are a-value 7.43 and b-value 0.80 that indicated medium to high categories of seismicity. The PGA value of earthquake events is between 0.001g and 0.203g. The result of this analysis is shown within the probabilistic seismic hazard curve that indicates seismic risk level at Sumbawa Island.

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Nonlinear dynamic soil structure interaction in adjacent basement

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IOP Conference Series: Materials Science and engineering 2020年第1期725卷

作者： Yetty Saragi Masyhur Irsyam Roesyanto Hendriyawan Postgraduate Student of Departement Civil Engineering University of North Sumatera (USU) Study Program of Civil Engineering Institute of Technolgy Bandung (ITB) Departement Civil Engineering University of North Sumatera (USU)

This research was conducted to analyze the lateral dynamic pressure distribution on the basement walls and amplification of earthquake motion on the surface using the finite element method Midas GTS-NX. Dynamic soil-structure interaction analysis was carried out by using a sensitivity program to influence soil conditions, earthquake acceleration in bedrock, basement depth, bedrock depth and stiffness of the basement structure with a distance between basements of 15,0 m. From this study, the lateral pressure distribution of the dynamic soil reaches the maximum at the base of the basement with an increase in pressure that is almost linear in soft and nonlinear soil conditions in medium and hard soil conditions. The greatest increase in gradient occurs at a depth of four per five basement walls measured from the surface to the bottom of the basement. The analysis shows that the dynamic lateral pressure distribution has a maximum value at the top end of the basement and tends to shrink to the bottom of the basement.

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Design mixed formula of hot mix asphalt mixture very thin overlay using crumb rubber

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IOP Conference Series: Materials Science and engineering 2020年第1期821卷

作者： S Sunarjono P A Wijaya N Hidayati A Magfirona Civil Engineering Postgraduate Study Program Universitas Muhammadiyah Surakarta Surakarta Indonesia Transportation Research Center Faculty of Engineering Universitas Muhammadiyah Surakarta Indonesia

One of the technologies expected to improve the quality of flexible pavement is to use a modified asphalt mixture of Crumb Rubber (CR). The material can be used as a very thin added layer which is then called Very Thin Overlay Modified Crumb Rubber (VTO Mod-CR) and the functions as a leveling layer. This asphalt mixture is expected to have high durability and increase the age service life of flexible pavement. The aim of this study was to analyze the design mix formula (DMF) and the durability of the asphalt mixture. This research carried out variations of asphalt content i.e. 6.0%, 6.5%, 7.0%, 7.5% and 8.0% with each variation of 3 specimens for Marshall Test. Based on the DMF analysis results obtained optimum asphalt content of 7.00%, while the properties of the mixture in the form of bulk density of 2.240, VIM of 3.77%, VMA of 18.15%, VFA of 79.23%, Stability of 1049 kg, Flow of 3.47 mm, Marshall Quotient of 251 kg / mm, Bitumen Film Thickness 16.08 µm. The results of the analysis of the mixture properties have met specifications General of Highways, so it can be used as a reference for AMP. The BFT value obtained meets the minimum specification specifications of 16 µm, this shows that the resistance to water and oxidation is higher, so the pavement becomes durable.

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The study of the operation of Trans Koetaradja public bus transportation of the corridor II A and II B in Banda Aceh city

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IOP Conference Series: Materials Science and engineering 2020年第1期933卷

作者： F Fachrurrozy E Wulandari Y Darma Civil Engineering Postgraduate Program Department of Civil Engineering Universitas Syiah Kuala Banda Aceh Indonesia Lecturer Advisory Committee the Architectural Study Programs in the Field of Urban Area Development Engineering Faculty Universitas Syiah Kuala Banda Aceh Indonesia Lecturer Advisory Committee in the Field of Transportation the Civil Department Civil Engineering Faculty Universitas Syiah Kuala Indonesia

Aceh Government is trying to plan the integrated transportation system. Aceh Government has planned the construction of 6 Corridors of Trans Koetaradja Bus, some of them are Corridors II A and II B. The previous public transport cannot accommodate the transportation service needs of the route of Sultan Iskandar Muda Airport - city center - Ulee Lheue Crossing Port. However, currently, the Banda Aceh Trans Koetaradja Public Bus Transportation is projected to be able to improve the services optimally. The purpose of this study is to assess the level of performance and to improve the quality of the service up to the customers' satisfaction expectations. The method of this research comprises the survey, which is sampling Kouto and distributing questionnaires and data analysis. The questionnaire distribution uses statistic test method and Importance Performance Analysis (IPA) through the SERVQUAL approach, namely: reliability, responsiveness, assurance, empathy, and physical evidence. The result of the study is that the current performance of the services of Trans Koetaradja public bus transportation is rated as good; the importance of the service regarding the customers' expectation is rated good; the quality of service provided to customers is rated 94.52%. The conclusion of this study is that there are several shortages of transportation performance, such as the timeliness of arrival, waiting time at bus stops, passenger assistance, and available seats.

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