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Evaluation of phase formation and physical-mechanical properties of Portland cements produced with civil construction waste

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CEMENT 2021年 5卷

作者： F.N. Costa D.V. Ribeiro Post-Graduate Program in Civil Engineering (PPEC)/Federal University of Bahia Rua Aristides Novis 02. Federação Salvador BA 40210-630 Brazil Department of Materials Science and Technology Federal University of Bahia Rua Aristides Novis 02. Federação Salvador BA 40210-630 Brazil

Cement is the most widely used building material worldwide. Its production demands a large amount of natural resources, in addition to high energy consumption. Thus, the cement industry has been looking for solutions that effectively reduce the use of these resources as well as greenhouse gas emissions. This research aims to show the technical feasibility of incorporating civil construction waste (CCW) in the production of Portland cement. To this purpose, the physicochemical characterization of the raw materials used was carried out, dosage and manufacture of the raw mix, which were calcined at 1450 °C. Clinkers were characterized mineralogically, by means of XRD, to verify the formation of the crystalline phases. Subsequently, the clinkers were ground, resulting in Portland cements, and their physical-mechanical properties were evaluated. The results showed the potential of using CCW as an alternative raw material, since experimental cements presented performance similar to industrial cements used as a reference.

关键词： civil construction waste (CCW Reuse Environment Cement Compressive strength

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Feasibility and prospective analysis of logistics engineering study program as the demands of the digital business era

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IOP Conference Series: Materials Science and engineering 2020年第4期830卷

作者： R M Masri I M Purwaamijaya B M Purwaamijaya Civil engineering department Faculty of Technology and Vocational Education Universitas Pendidikan Indonesia West Java Indonesia Digital Business Study Program Tasikmalaya Campus Universitas Pendidikan Indonesia West Java Indonesia

The rapid development of information and communication technology will deliver the public to the changing era, including in the business industry. The global community is currently in a transition towards digital society which is characterized by intensive use of science, technology and humanities, integrated infrastructure that demands human resources to be able to creative and innovative in order to face the demands in the digital business era. The existence of these changes affect global trends in logistics business practices in the industry, including by the movement towards free markets and regional cooperation to expand markets. Market expectations also change as global competition in products and services pushes for higher standards, lower costs and increasingly diverse choices of customers in the market. Research is needed with a comprehensive qualitative approach, mechanism, and exploration of needs to be anticipated by university to become a center of excellence and contribute to the real world by producing human resources that have strong character and integrity accompanied by the ability to innovate and utilize their digital knowledge to be able to work and win competitions in the global business industry, both as practitioners and academics, one of them is by opening a logistics engineering study program by focusing on e-logistics that suits market needs.

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Knowledge, Awareness, and Resilience of Earthquake and Tsunami Disaster Risk Reduction in Coastal Area

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Journal of Physics: Conference Series 2021年第1期1811卷

作者： Rr M I Retno Susilorini Rina Febrina Helmia Adita Fitra Juniastel Rajagukguk Dhiyan Krishna Wardhani B Y Arya Wastanimpuna Laurel Lia Nola Prameswari Department of Infrastructure and Environmental Engineering Faculty of Environmental Science and Technology Soegijapranata Catholic University Semarang 50234 Central Java Indonesia Department of Civil Engineering Faculty of Engineering Malahayati University Bandar Lampung 35153 South Sumatera Indonesia Department of Regional and Urban Planning Sumatera Institute of Technology South Lampung 35365 South Sumatera Indonesia Department of Physics Faculty of Mathematics and Natural Sciences Universitas Negeri Medan Medan 20221 North Sumatera Indonesia Doctoral Program of Digital Architecture Faculty of Architecture and Design Soegijapranata Catholic University Semarang 50234 Central Java Indonesia

Indonesia is earthquake and tsunami prone areas, included Sumatera Island. Bandar Lampung is also vulnerable to earthquake and tsunami, especially Kangkung fishing village in Lampung Bay. Disaster risk reduction is very important to be implemented in the cases of earthquake and tsunami, which can save more life and build resilience in facing the hazard. This research aimed to study how the knowledge, awareness, and resilience of people in Kangkung fishing village can strengthen the earthquake and tsunami disaster risk reduction. This research conducted by quantitative methods. Survey and interview of 53 respondents were conducted as well as data collecting approached by purposive sampling. The results found that there is little knowledge and awareness of people in Kangkung fishing village of the hazard of earthquake and tsunami. Therefore, this research proposed a model of 'Community-Based Resilience Strategy' Model of earthquake and tsunami disaster risk reduction. It is a comprehensive and sustainable model of how people take a part in disaster risk reduction by intensive participatory. Conclusion of this research emphasized that disaster risk reduction is a big matter in marginalized society such as people in Kangkung fishing village. The 'Community-Based Resilience Strategy' Model of earthquake and tsunami disaster risk reduction that may increase the knowledge and awareness to become more resilience.

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Water quality indices for rainwater quality assessment in Bandung urban region

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IOP Conference Series: Materials Science and engineering 2019年第1期669卷

作者： N Y Hasan Driejana A Sulaeman H D Ariesyady Doctoral Program of Environmental Engineering Faculty of Civil and Environmental Engineering Bandung Institute of Technology Faculty of Civil and Environmental Engineering Bandung Institute of Technology Faculty of Mathematics and Natural Science Bandung Institute of Technology

Water quality indices (WQI) using STORET method has been used to assess rainwater quality in the Bandung urban regions, based on monitoring data at three locations (Coblong, Sumur Bandung, and Buah Batu). Rainwater samples were analyzed by detecting pH, SO4 2-, NO3 −, Cl−, and heavy metals (As, Cd, Cr, Pb, and Zn) compared with Indonesian Government Regulation No. 82 Year 2001. Rainwater quality showed polluted based on the parameters of the water quality indices analysis using the Class I and Class II criteria. Rainwater quality in Bandung urban region were lightly polluted (Coblong) and moderately polluted (Sumur Bandung and Buah Batu). Rainwater can potentially become a water sources alternative for domestic use and urban farming in Bandung urban region, but it requires further treatment for better quality.

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Effects of TiO 2 waste on the formation of clinker phases and mechanical performance and hydration of Portand cement

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CEMENT 2022年 9卷

作者： José S. Andrade Neto Bruna B. Mariani Nilson S. Amorim Júnior Daniel V. Ribeiro Laboratory of Testing on Materials Durability (LEDMa) / Federal University of Bahia Rua Aristides Novis 02. Federação. 40210-630. Salvador/BA Brazil Post-Graduate Program in Civil Engineering (PPEC) / Federal University of Bahia Aristides Novis 02. Federação. 40210-630. Salvador/BA Brazil Department of Materials Science and Technology / Federal University of Bahia Aristides Novis 02. Federação. 40210-630. Salvador/BA Brazil

The incorporation of different levels of UOW into Portland clinker raw meals and its effects on the clinker and cement properties were evaluated. Clinkers were produced and characterized by X-ray diffractometry (XRD) and optical microscopy; the cements were produced and physically characterized. Finally, pastes were produced and analyzed using isothermal calorimetry, thermogravimetry, XRD, and compressive strength tests. UOW, when added up to 1.29% in Portland clinker raw meal, acts as a mineralizer, increasing the content of alite by 6.44%. The incorporation of UOW reduces the hydration rate in the first days owing to the increase in the size of the alite crystals and delays the point of sulfate depletion due to the increase in the SO 3 content of the clinkers. Owing to the higher content of alite formed, the cement produced from the raw meal with 1.29% of UOW presents the highest early mechanical strength (up to 7 days).

关键词： Portland clinker Unreacted ore waste (UOW) Mineralizer Hydration

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Reduction of BOD and COD of by using stratified filter and constructed wetland for blackwater treatment

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IOP Conference Series: Materials Science and engineering 2019年第1期469卷

作者： Lies Kurniawati Wulandari M Bisri Donny Harisuseno Emma Yuliani Doctoral Program in Civil Engineering Faculty of Engineering Brawijaya University Indonesia Civil Engineering Department Postgraduate Program Malang National Institute of Technology Indonesia Water Resources Engineering Department Faculty of Engineering Brawijaya University Indonesia Civil Engineering Department Faculty of Engineering Brawijaya University Indonesia

Blackwater is a type of domestic wastewater that must be processed before discharge into the river. This study uses gravel, sand, and charcoal as filtration materials which arranged from coarse to fine, and also wetland system using Vetiver grass (Vetiveria zizanioides) and Cattail (Typha angustifolia). The treatment process is obtained by applying different treatments related to the sand thickness and blackwater residence time in the wetland. The focus of observation is emphasized on the measurement of BOD (Biological oxygen demand) and COD (Chemical oxygen demand). Both parameters measured and compared with the standard of water for agricultural purposes (Grade IV) regulated by Indonesian Government. The results showed that stratified filters can reduce the levels of BOD and COD effectively. The final results obtained after blackwater flowed through the wetland tube shows that BOD and COD levels have yet to meet the standard of grade IV water, although the overall result indicated the significant reduction of both parameters. This can be related to the input of organic matter from wetland itself, and it also can be considered an indication that blackwater treatment requires longer residence time.

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Analytical model of retrofitted reinforced concrete beam column joints after experiencing severe damage from earthquake load simulation using SAP2000

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IOP Conference Series: Materials Science and engineering 2019年第1期508卷

作者： N Gosal I Imran M Riyansyah Post Graduate Program of Faculty of Civil Engineering Bandung Institute of Technology 40132 Bandung Indonesia Structural Engineering Department Faculty of Civil Engineering Bandung Institute of Technology 40132 Bandung Indonesia

An earthquake resistant structure should be able to perform as expected when it's struck by an earthquake such as it may experience slight damage and should be able to be repaired to its original state when struck by a design level earthquake. However, there are still debates whether reparation should also be viable when structures are experiencing severe damage. There are still a little to no studies about repairing severely damaged structures, therefore a study was made to see how severely damaged structures behaved after being repaired. Two beam column joints are used as specimens, which were severely damaged by an earthquake simulation before getting repaired. Both their initial and repaired condition are then modeled analytically using SAP2000. Their behaviors such as plastic hinges, joint's shear deformation, bond slip, and rebars' residual strain and stress due to previous loading are also implemented to the model. Although the lateral strength of the specimens are similar to their analytical model, the other behavior, especially their stiffness is not similar, therefore needing another parameter implemented in the model.

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Abilities of stratified filter and wetland to reduce TDS and TSS in blackwater domestic waste

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IOP Conference Series: Materials Science and engineering 2019年第1期469卷

This study aimed to devisea new design of domestic waste treatment which can produce an output of class IV water (irrigation water) based on measurement of TDS (Total Dissolved Solid) and TSS (Total Suspended Solid) parameters. The physical model tested in this research wasa stratified filter consisting of compositionsfrom coarse to fine materialsnamely gravel, charcoal and sand. Furthermore, filtering blackwater waste was refined by remediation with Cattail (Typha Angustifolia) and Vetiver (Vetiveria Zizanoides). The physical model of WWTP was set to 1:25 added by a stratified filter in the upstream section. Observations were done by measuring blackwater TDS levels prior to treatment, after going through a stratified filter, and after going through a remediation process with aquatic plants. The results showed that stratified filters and wetland can reduce TDS levels in blackwater until it reached the standard for irrigation water.

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HAZUS-based drill scripts generation using unity and ontology with Semantic Rules 34

HAZUS-based drill scripts generation using unity and ontolog...

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34th International Symposium on Automation and Robotics in Construction, ISARC 2017

作者： Chu, C.P. Liu, C.Y. Hsieh, C.C. Chang, C.H. Chou, C.C. Information Technology Program Department of Civil Engineering National Central University Taiwan

As there is an increasing number of disasters hitting countries around the world, numerous mitigation strategies have been proposed and implemented to alleviate such impacts. Indeed, every year many public and private organizations work together to prepare various disaster exercises for training their first responders. Design of an appropriate drill script, hence, plays an important role of enhancing the capability of first responders or emergency response units in response to a real disaster. However, developing a reasonable disaster scenario is a time-consuming and error-prone task, not to mention the prerequisites pertaining to extensive experience and knowledge in disasters handling that drill script designers must have. Therefore, in this research an ontology model with SWRL (Semantic Web Rule Language) constructs was proposed to help the drill scripts generation process. Drill script designers can use the Taiwan Earthquake Loss Estimation System (TELES), which is a customized and simplified version of the HAZUS-MH program from FEMA (Federal Emergency Management Agency), to create data sets describing the impact of a simulated earthquake in a certain region. Then, the proposed model and tools, called EDSS (Earthquake Drill Scripts generation and rendering System), can incorporate the input data sets and generate a set of corresponding drill scripts, which follow the pre-defined rules represented in the ontology model. Each drill script will contain a unique and possible scenario describing the earthquake damage on different buildings or facilities in the region. Unity, a serious game platform, was utilized in the proposed system for displaying all the events associated with the earthquake in accordance with the drill script designed. Finally, disaster mitigation experts were asked to evaluate the drill scripts generated and to assess the effectiveness of the proposed model. The assessment results showed that the proposed model and tools can help first responder

关键词： Ontology

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Computation of Polyhedral Positive Invariant Sets via Linear Matrix Inequalities 16

Computation of Polyhedral Positive Invariant Sets via Linear...

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16th European Control Conference, ECC 2018

作者： Rubin, Daniel Nguyen, Hoai-Nam Gutman, Per-Olof Autonomous Systems Program Technion- Israel Institute of Technology Haifa Israel Control Signal and System Department IFP Energies Nouvelles Rond-point de l'Échangeur de Solaize BP3 Solaize69360 Israel Faculty of Civil and Environmental Engineering Technion- Israel Institute of Technology Haifa Israel

ISBN: (纸本)9783952426982

This paper presents a linear matrix inequality based algorithm for computation of polyhedral positive invari- ant sets for linear discrete-time systems subject to bounded state and input constraints. While the main algorithm is suitable for computation of polyhedral invariant sets of a general shape, a second algorithm specialized for symmetric sets is also presented. The results are extended to include polytopic uncertainty. Verification and demonstration of the proposed scheme is done through numerical examples. © 2018 European Control Association (EUCA).

关键词： Linear matrix inequalities

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