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2nd International Conference on Mechanical, Electronics, Computer, and Industrial Technology, MECnIT 2018

作者： Astutik, Yayuk Setyaning Civil Engineering Study Program Planning and Civil Engineering Faculty Universitas Internasional Batam Riau Island29442 Indonesia

Reinforced concrete slab are widely used in civil buildings, including as building floors, roof floors, bridge floors and dock floors. The load acting on the slab is generally calculated against gravitational loads. This study aims to analyse floor slab in One Residence Batam Center Apartment Construction Project. The moment method is used to predict the magnitude of frame and shrinkage values that refer to 2002 of SNI. Loading is carried out from dead loads and live loads with a two-way reinforcement system. Reinforcement is done using steel with a diameter of 10 mm. So that the minimum area is 313 mm square with a distance of 250 mm and is in the safe category. From the calculation results obtained the concrete elastic modulus obtained by 250 MPa with a reinforcement ratio of 0.0025. Checking the time dependency factor for dead loads is carried out within 3 months, 6 months, 12 months and more than 5 years. Long-term deflection due to frame and shrinkage is still in the safe category. © 2019 Published under licence by IOP Publishing Ltd.

关键词： Floors

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The influence of preparation and pretreatment on the physicochemical properties and performance of plant-based biocoagulants in treating wastewater

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Environmental Advances 2023年 14卷

作者： Kurniawan, Setyo Budi Ahmad, Azmi Said, Nor Sakinah Mohd Gustinasari, Kiki Abdullah, Siti Rozaimah Sheikh Imron, Muhammad Fauzul Laboratory of Algal Biotechnology Centre Algatech Institute of Microbiology of the Czech Academy of Sciences Opatovický mlýn Novohradská 237 Třeboň 379 81 Czech Republic Department of Petrochemical Engineering Politeknik Tun Syed Nasir Syed Ismail Johor Pagoh 84600 Malaysia Department of Chemical and Process Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia (UKM) Selangor Bangi 43600 Malaysia Study Program of Environmental Engineering Department of Biosystem Engineering Faculty of Agricultural Engineering Universitas Brawijaya Malang 65145 Indonesia Study Program of Environmental Engineering Department of Biology Faculty of Science and Technology Universitas Airlangga Kampus C UNAIR Jalan Mulyorejo Surabaya 60115 Indonesia Department of Water Management Faculty of Civil Engineering and Geosciences Delft University of Technology Stevinweg 1 CN Delft 2628 Netherlands

Biocoagulants have gained attention as an alternative to chemical coagulants in water and wastewater treatment due to their ability to remove pollutant parameters such as turbidity, suspended solids, color, and organic compounds. Plant-based biocoagulants are currently the most promising due to their abundant availability and reliable performance. A proper preparation of plant-based biocoagulants is required to ensure the active compounds from the plants can be extracted. Plant raw materials are prepared into biocoagulants using drying and grinding, extraction, and purification. In mechanical preparation, drying and grinding exhibit great influence on the performance of plant-based biocoagulants due to the removal of moisture and higher contact with the carrier medium during dissolution. A smaller biocoagulant's size resulted in up to 78 % higher removal of turbidity. In chemical preparation, the oil needs to be removed before extracting the active ingredients to avoid low active compound extraction yields. The defatting of Moringa oleifera seeds showed an 18 % higher protein content. Salt and alcohol extractions were mentioned as superior extraction methods to obtain carbohydrate and protein from plant-based biocoagulants compared to water extraction, with up to a 5 % increment in turbidity removal. Preparation and pretreatment protocols have a great influence on the properties and performance of plant-based biocoagulants. Further extension of research on plant-based biocoagulants should address the problems in the initial characterization of plant material, standard pretreatment and preparation protocols, and real-scale application of plant-based biocoagulants. © 2023 The Author(s)

关键词： Biocoagulant Coagulant Environmental pollution Extraction Properties Synthesis

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Characterization of Sludge Generated from Acid Mine Drainage Treatment Plants

Characterization of Sludge Generated from Acid Mine Drainage...

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Universitas Riau International Conference on Science and Environment 2019, URICSE 2019

作者： Amanda, N. Moersidik, S.S. Environmental Engineering Study Program Department of Civil Engineering University of Indonesia Depok16424 Indonesia

One of the wastes generated from coal mining area is the voluminous sludge, laden of metals. This sludge comes as precipitate which is produced from acid mine drainage active treatment ponds and always been disposed to the landfill. Limestone is one of the typical pH neutralization agents which is often used to bind the metal content of acid mine drainage in active treatment and will be settled at the bottom of the settling ponds. The goal of this study is to determine the potential utilization of acid mine drainage sludge in order to reduce the environmental problem caused by sludge accumulation so that this could become a valuable material. In this study, physical and chemical characterization from the sludge in solid form was carried out by laboratory analysis using SEM-EDS to see surface morphology, X-Ray Diffraction for mineralogy analysis, the chemical composition was done by using X-Ray Fluorescence and also BET method to see the surface area of the sample. The results of the characterization have shown that acid mine drainage sludge was very promising to be utilized as adsorbent material for removing pollutant in wastewater and further research is needed for the application to the wastewater technology. © Published under licence by IOP Publishing Ltd.

关键词： Lakes

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The impact of job-program based learning models on student learning outcomes in the masonry and concrete construction course

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AIP Conference Proceedings 2022年第1期2489卷

作者： Sugiyanto Sugiyanto Priyono Priyono Hadi Wasito Isnandar Isnandar Made Wena Building Engineering Education Study Program Department of Civil Engineering Faculty of Engineering Universitas Negeri Malang Indonesia

The research is experimental research that aims to determine whether there were differences in job-program- based practice with conventional practice on student learning outcomes. The trial subjects were students of the D3 civil and Building engineering study program FT UM who took the Masonry and Concrete Construction Practice course. In the field trial, the experimental group consisted of 23 students, while the control group consisted of 22 students. This research employs t-test analysis. The result shows differences in learning outcomes between students learning using Job program- based practical methods and students learning using conventional practical learning with a t-value of 6.054 at the significance level of 0.000. In conclusion, the Job-program learning methods significantly improve the learning outcome.

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Experimental study of Mortar Compressive Strength with Anadara Granosa Powder as a Substitute for Partial Use of Cement 1

Experimental Study of Mortar Compressive Strength with Anada...

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1st International Conference of Construction, Infrastructure, and Materials, ICCIM 2019

作者： Sandjaya, A. Tavio Christianto, D. Bachelor of Civil Engineering Study Program Universitas Tarumanagara Tomang Grogol Petamburan West Jakarta Indonesia Bachelor of Civil Engineering Study Program Institut Teknologi Sepuluh Nopember Keputih Sukolilo Surabaya Indonesia

Making cement produces carbon dioxide (CO2) gas which results in the greenhouse effect. To reduce the use of cement, alternative materials are examined. One of the raw materials for making cement is limestone. Limestone is a sedimentary rock mainly composed of calcium carbonate. Blood clams (Anadara Granosa) are tried to replace cement because they have a high calcium carbonate mineral composition. Blood clams are crushed into powder and filtered using No.325 filter. Cement is replaced by weight by 5%, 10%, 15%, and 20%. Mortar specimens in the form of cubes with a size of 5 cm. Mortar compressive strength test was carried out at 7 and 28 days. Anadara Granosa powder reacts very weakly with water and increases the initial compressive strength of the mortar. The results of Anadara Granosa mortar compressive strength test at 7 days were higher than normal mortar. The most efficient composition is indicated by cement replacement of 20%. © Published under licence by IOP Publishing Ltd.

关键词： Cements

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Preliminary Analysis of Blackwater and Greywater Characteristics in the Jakarta Greater Region Area

Preliminary Analysis of Blackwater and Greywater Characteris...

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International Conference on Sustainable Insfrastructure 2018, ICSI 2018

作者： Hafiza, N. Abdillah, A. Islami, B.B. Priadi, C.R. Environmental Engineering Study Program Civil and Environmental Engineering Department Faculty of Engineering Universitas Indonesia Depok Indonesia

Domestic wastewater contributes about 40% as the source of water bodies pollutants in Indonesia, causing the spread of pathogens and bioaccumulation effects on the environment. The purpose of this study was to analyze the characteristics of household wastewater in Jakarta and Depok in terms of quantity and quality. The average wastewater quantity estimation results from laundry, bathroom, kitchen, and closet were 49 ± 18, 79.1 ± 5, 24.5 ± 12, and 29.9 ± 3 liters/person/day. The qualitative analysis results stated that blackwater tends to have higher concentration on conductivity 1606-2046 μs/cm, TDS 709-1007 mg/L, ammonia 78-167 mg/L, total nitrogen 511-836 mg/L, total phosphorus 16.6-21.3 mg/L, phosphate 33-46.8 mg/L, potassium 32.5-47.9 mg/L, and fecal coliform 430,000-1.600,000 MPN/100 mL compared to other sources. Meanwhile, laundry greywater tends to have higher concentration on COD 559-1991.6 mg/L, MBAS 0.3-0.31 mg/L, aluminum 1.65-5.09 mg/L, sodium 7.5-61.4 mg/L, and silica 17.7-23.2 mg/L compared to other sources. Statistical results show that some parameters have significant difference in average concentration between each source so that these parameters can be considered as source tracer. The high pollutant concentration and quantity leads to high estimation of pollutant load on the river, as water bodies receiver, in Jakarta and Depok, especially on organic and nutrient load. © 2019 Published under licence by IOP Publishing Ltd.

关键词： Silica

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Management of excessive vibration on floor slabs system: A case study of Pt. Persero Pegadaian branch office of Oepura, Indonesia

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AIP Conference Proceedings 2024年第1期3034卷

作者： Don Gaspar Noesaku da Costa Christiani Chandra Manubulu Mauritius I.R. Naikofi Hendry Zacharias Jusuf Wilson M. Rafael Ria Rangga Bhajowawo Study Program of Civil Engineering Faculty of Engineering Universitas Katolik Widya Mandira Jl San Juan No.1 Penfui Timur Kupang NTT Indonesia East Nusa Tenggara Regional Settlement Infrastructure Center Jl. Polisi Militer No.1 Kupang Nusa Tenggara Timur Indonesia Study Program of Civil Engineering Politeknik Negeri Jl. Adi Sucipto PO. Box 139 Penfui Kupang NTT Indonesia Study Program of Architecture Faculty of Engineering Universitas Katolik Widya Mandira Jl San Juan No.1 Penfui Timur Kupang NTT Indonesia

Excessive vibrations on the floor slabs have an impact on the emergence of feelings of anxiety, worrying about the collapse of the building. From the results of visual observations, it was found that there is damage to the floor covering. This strongly indicates that there is a problem of deflection of the slab and/or floor beams, so this study is aimed at identifying the factors causing excessive vibrations on the floor slab, and recommending strategies and techniques for handling them. For this reason, the calculation of the frequency value of the floor plate vibration due to a combination of fixed and temporary loads acting on the building concerned. It was found that the natural fundamental frequency value of the existing slab is less than the standardized value i.e., 7.5 Hz. In addition, from the horizontal and vertical configuration of the building’s structural elements, it is known that the area of the floor slab that experiences excessive vibration is greater than 12 m2 so that the selected form of reinforcement is the addition of a structural column in the middle of the span of the main beam that supports the floor slab. Furthermore, a simulation of the calculation of the stability of the structure after the addition of the column is carried out. The simulation results show that the natural fundamental frequency value becomes greater than 7.5 Hz, i.e., 8,539 Hz. This proves that the excessive vibration on the floor slab is caused by a floor area that is too large so that the addition of a supporting column in the middle of the span of the main beam supporting the floor slab is proven to be able to eliminate excessive vibration.

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Review of the use of mangrove forests in supporting the socio-economic life of fishing communities 2

Review of the use of mangrove forests in supporting the soci...

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2nd International Conference of Interdisciplinary Research on Green Environmental Approach for Sustainable Development, ICROEST 2020

作者： Untari Darma, R. Betaubun, P. Arief, A.A. Graduate School Hasanuddin University South Sulawesi Indonesia Department of Agribusiness Faculty of Agriculture Universitas Musamus Papua Indonesia Agribusiness Study Program Faculty of Agriculture Hasanuddin University South Sulawesi Indonesia Department of Civil Engineering Faculty of Engineering Universitas Musamus Papua Indonesia Socio Economic of Fisheries Study Program Faculty of Marine Science and Fisheries Hasanuddin University South Sulawesi Indonesia

Mangrove forests have an important function in human life that cannot be replaced by other functions. The existence of mangrove forests has six main functions, namely biological, ecological, physical, social, economic and chemical functions. This article discusses the description of mangrove forest management in meeting the needs of the economic and social functions of the fishing communities on the coast of Merauke Regency, Papua Province, which were reviewed descriptively using relevant literature studies. In terms of economic function, mangrove forests provide economic value for fishing communities because mangrove forests become habitat for crabs, fish and other marine biota that are captured and sold as the main source of family income. In addition, the use of mangrove forests by fishermen on the coast is used as firewood and building materials. The high utilization of mangrove forests by coastal communities that ignores ecological sustainability causes damage to mangrove forests that threatens the sustainability of ecological functions. Damage to mangrove forests in Merauke in the period 2000-2005 was recorded as wide as 2,416 ha while in the 2005-2010 period damage reached 2,233 ha of the total area of the Merauke mangrove forest which reached 216,001.95 Ha or 6.98% of the Merauke forest area. Based on this, the management of mangrove forest utilization needs to get more attention from various parties so that the ecological function of mangrove forests as a condition of sustainable development, especially for fishing communities on the coast, can be realized in Merauke Regency. © Published under licence by IOP Publishing Ltd.

关键词： Sustainable development

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Analysis and evaluation of stability for the reactivated road landslide using electrical resistivity and induced polarization in Muara Badak district, East Kalimantan, Indonesia

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AIP Conference Proceedings 2024年第1期3095卷

作者： Wahidah Wahidah Piter Lepong Andi Alamsyah Djayus Djayus Supriyanto Supriyanto Qori Fajar Hermawan Amir Amir Geophysics Laboratory Faculty of Mathematics and Natural Sciences Mulawarman University Samarinda East Kalimantan Indonesia Civil Engineering Study Program Faculty of Engineering Universitas 17 Agustus 1945 Samarinda East Kalimantan Indonesia

Muara Badak is one of the districts that prone to the road landslide in Kutai Kertanegara Regency of East Kalimantan province in Indonesia. Reactivated landslides have been identified in several locations in the road access to Muara Badak district, for instance the Simpang-3 Sambera. Geophysical study has been carried out using Wenner Alpha of Electrical Resistivity Tomography (ERT) and Time Domain of Induced Polarization (IP) methods. Assessment and measurement conducted in three lines parallel to the road using MAE Unit-48 electrodes with three meters interval. Resistivity inversion shows the area predominantly composed of clay, sandy clay and coal, with resistivity value within 1-80 ohm.m, 81-200 ohm.m and >200 ohm.m respectively. Slip surface has been interpreted about 6 meter depth, occurring between the contacts of less-consolidated sandy clay and consolidated clay with translation pattern and thicker to the toe of the landslide. The IP data using to interpret the groundwater table at the depth of 3-4 meter based on the pattern of chargeability that closed to the surface. Furthermore and correlated to the Standard Penetration Test (SPT) data, the contact between the weak zone and the hard zone is interpreted to be at the depth of 6 meters. It is concluded that the trigger of the reactivated landslide in Simpang-3 Muara Badak were triggered by several factor including, rainfall and run of water, groundwater and steeply slope.

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Utilization of coconut shell ash as a substitute for sand into the concrete mix with the addition of Sikament NN in terms of compressive strength of concrete

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AIP Conference Proceedings 2023年第1期2601卷

作者： Fahrizal Zulkarnain Muhammad Mulyadhi Civil Engineering Study Program Universitas Muhammadiyah Sumatera Utara Jl. Kapten Muchtar Basri No.3 Medan 20238 Indonesia

Natural resources in our country are available in abundance, but they cannot be said to be unlimited. The utilization of natural resources must endeavor to achieve maximum efficiency and effectiveness. Coconut shell is waste from households or industries that use coconut as the main ingredient. Sikament NN is a mixed material that functions as an additive to reduce water content and to accelerate the hardening of concrete and its high flexibility, concentrated cement mixture specially designed to improve the quality and strength of a building. This study aims to study the effect of adding coconut shell ash as a substitute for sand into the concrete mix. By varying the addition of coconut shell ash BN, 0%, 5%, 10%, 15% of the weight of sand in the mix design, and Sikament NN of 0.8% of the weight of cement in the general formula. The concrete test sample used was a cylinder with a general size of 15 x 30 cm3 as many as 15 samples test objects. The next test was carried out by looking at the effect of adding coconut shell ash to 28 days on the compressive strength value. The average compressive strength of concrete obtained according to the variation is BN (31.33 MPa), 0% (38.12 MPa), 5% (29.25 MPa), 10% (25.29 MPa), 15% (22.46 MPa). The distribution of the optimum concrete compressive strength value was obtained at 0% coconut shell ash variation. Keywords: Coconut Shell Ash, Sikament NN, Concrete Compressive Strength.

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