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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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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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Organic composts as A vehicle for the entry of microplastics into the environment: A comprehensive review

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The Science of the total environment 2023年 892卷 164758页

作者： Van-Re Le Minh-Ky Nguyen Hoang-Lam Nguyen Chitsan Lin Md Refat Jahan Rakib Van-Anh Thai Van-Giang Le Guilherme Malafaia Abubakr M Idris Ho Chi Minh City University of Food Industry (HUFI) 140 Le Trong Tan Street Tan Phu District Ho Chi Minh City 700000 Viet Nam. Faculty of Environment and Natural Resources Nong Lam University of Ho Chi Minh City Hamlet 6 Linh Trung Ward Thu Duc City Ho Chi Minh City 700000 Viet Nam Ph.D. Program in Maritime Science and Technology National Kaohsiung University of Science and Technology Kaohsiung 81157 Taiwan. Electronic address: nmky@hcmuaf.edu.vn. Department of Civil Engineering McGill University Montreal Canada. Ph.D. Program in Maritime Science and Technology National Kaohsiung University of Science and Technology Kaohsiung 81157 Taiwan Department of Marine Environmental Engineering National Kaohsiung University of Science and Technology Kaohsiung 81157 Taiwan. Department of Fisheries and Marine Science Faculty of Science Noakhali Science and Technology University Noakhali 3814 Bangladesh. Electronic address: rifatjahanrakib@***. Institute of Aquatic Science and Technology National Kaohsiung University of Science and Technology Kaohsiung City 81157 Taiwan. Central Institute for Natural Resources and Environmental Studies Vietnam National University Hanoi 111000 Viet Nam. Post-Graduation Program in Ecology Conservation and Biodiversity Federal University of Uberlândia Uberlândia MG Brazil Post-Graduation Program in Biotechnology and Biodiversity Federal University of Goiás Goiânia GO Brazil Post-Graduation Program in Conservation of Cerrado Natural Resources Goiano Federal Institute Urutaí GO Brazil. Electronic address: guilhermeifgoiano@***. Department of Chemistry College of Science King Khalid University 61431 Abha Saudi Arabia Research Center for Advanced Materials Science (RCAMS) King Khalid University Abha 61421 Saudi Arabia.

Plastic pollution is a widespread issue that poses a threat to agroecosystems. Recent data on microplastic (MP) pollution from compost and its application to soil have highlighted the potential impact of micropollutants that may be transferred from compost. Thus, we aim with this review to elucidate the distribution-occurrence, characterization, fate/transport, and potential risk of MPs from organic compost to gain comprehensive knowledge and mitigate the adverse impacts of compost application. The concentration of MPs in compost was up to thousands of items/kg. Among micropollutants, fibers, fragments, and films are the most common, with small MPs having a higher potential to absorb other pollutants and cause harm to organisms. Various synthetic polymers, including polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polystyrene (PS), polyvinyl chloride (PVC), polyester (PES), and acrylic polymers (AP), have been widely used of plastic items. MPs are emerging pollutants that can have diverse effects on soil ecosystems, as they can transfer potential pollutants from MPs to compost and then to the soil. Following the microbial degradation scheme, the transfer chain from plastics to compost to soil can be broken down into main stages, i.e., colonization - (bio)fragmentation - assimilation - and mineralization. Microorganisms and adding biochar play an essential role during composting, which can be an effective solution to enhance MP degradation. Findings have shown that stimulating free radical generation could promote the biodegradation efficacy of MPs and possibly remove their occurrence in compost, thereby reducing their contribution to ecosystem pollution. Furthermore, future recommendations were discussed to reduce ecosystem risks and health challenges.

关键词： Emerging contaminants Free radicals Mineralization Organic waste Plastic pollution Polymers

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Road infrastructure asset management strategy and its impact on the environment

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IOP Conference Series: Materials Science and engineering 2020年第2期830卷

作者： K Priyatiningsih M Sutrisno Lecturer of Asset Management Study Program Politeknik Negeri Bandung Bandung 40012 Indonesia Student of Management Science Doctoral Program School of Post Graduate Universitas Pendidikan Indonesia Bandung Indonesia Lecturer of Civil Engineering Politeknik Negeri Bandung Bandung 40012 Indoenesia

The development of the economic sector is determined by services to the public through reforms that aim to place public satisfaction through the management of road infrastructure assets. Some research on road infrastructure assets still requires a deepening of studies related to the delivery of public services related to asset management systems. The purpose of this study is to find an appropriate road infrastructure asset management strategy through an integrated asset management system and asset management policies that can provide public satisfaction. This comprehensive approach to management strategies ensures that the performance of service provider assets is in line with the expectations of stakeholders including road users. This descriptive qualitative research is based on the perspective of road users as respondents, consisting of vehicle drivers from 50 transportation companies (people or goods) through interviews and observations. The results show aspects of asset performance based on the user's perspective there are five aspects, namely productivity, efficiency, effectiveness, use of resources and institutions and this performance is integrated in the asset management system related to policies from the management authority through service delivery namely quality and mobility, risk and use and maintenance of resources. The conclusion of this research is that road infrastructure asset services can be improved through the concept of road infrastructure asset management strategies in an integrated management system with five aspects of performance and more directed towards asset management policies related to the provision of road infrastructure asset services.

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AHR is a Zika virus host factor and a candidate target for antiviral therapy (vol 52, pg 941, 2020)

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NATURE NEUROSCIENCE 2020年第10期23卷 1307-1307页

作者： Giovannoni, Federico Bosch, Irene Polonio, Carolina Manganeli Torti, Maria F. Wheeler, Michael A. Li, Zhaorong Romorini, Leonardo Rodriguez Varela, Maria S. Rothhammer, Veit Barroso, Andreia Tjon, Emily C. Sanmarco, Liliana M. Takenaka, Maisa C. Modaresi, Seyed Mohamad Sadegh Gutierrez-Vazquez, Cristina Zanluqui, Nagela Ghabdan dos Santos, Nilton Barreto Munhoz, Carolina Demarchi Wang, Zhongyan Damonte, Elsa B. Sherr, David Gehrke, Lee Peron, Jean Pierre Schatzmann Garcia, Cybele C. Quintana, Francisco J. Ann Romney Center for Neurologic Diseases Brigham and Women’s Hospital Harvard Medical School Boston MA USA Laboratorio de Estrategias Antivirales Departamento de Química Biológica Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires. CONICET—Instituto de Química Biológica Buenos Aires Argentina Institute for Medical Engineering and Science Massachusetts Institute of Technology Cambridge MA USA Department of Medicine Mount Sinai School of Medicine New York NY USA Neuroimmune Interactions Laboratory Immunology Department—ICB IV University of São Paulo São Paulo Brazil Scientific Platform Pasteur—USP University of São Paulo São Paulo Brazil Laboratorio de Investigación aplicada a Neurociencias Fundación para la Lucha contra las Enfermedades Neurológicas de la Infancia Buenos Aires Argentina Immunopathology and Allergy Post Graduate Program School of Medicine University of São Paulo São Paulo Brazil Department of Pharmacology Institute of Biomedical Science University of São Paulo São Paulo Brazil Dept. of Environmental Health Boston University School of Public Health Boston MA USA Program in Virology Division of Medical Sciences Harvard Medical School Boston MA USA Broad Institute of MIT and Harvard Cambridge MA USA

Zika virus (ZIKV) is a flavivirus linked to multiple birth defects including microcephaly, known as congenital ZIKV syndrome. The identification of host factors involved in ZIKV replication may guide efficacious therapeutic interventions. In genome-wide transcriptional studies, we found that ZIKV infection triggers aryl hydrocarbon receptor (AHR) activation. Specifically, ZIKV infection induces kynurenine (Kyn) production, which activates AHR, limiting the production of type I interferons (IFN-I) involved in antiviral immunity. Moreover, ZIKV-triggered AHR activation suppresses intrinsic immunity driven by the promyelocytic leukemia (PML) protein, which limits ZIKV replication. AHR inhibition suppressed the replication of multiple ZIKV strains in vitro and also suppressed replication of the related flavivirus dengue. Finally, AHR inhibition with a nanoparticle-delivered AHR antagonist or an inhibitor developed for human use limited ZIKV replication and ameliorated newborn microcephaly in a murine model. In summary, we identified AHR as a host factor for ZIKV replication and PML protein as a driver of anti-ZIKV intrinsic immunity.

关键词： Immunology Microbiology

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Visual assessment deterioration analysis of runways at Sultan Aji Muhammad Sulaiman Sepinggan Airport Balikpapan

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AIP Conference Proceedings 2019年第1期2114卷

作者： Yanti Sri Sunarjono Agus Riyanto Nurul Hidayati Alfia Magfirona 1Civil Engineering Post Graduate Program Universitas Muhammadiyah Surakarta Surakarta Central Java Indonesia

Sultan Aji Muhammad Sulaiman Sepinggan (SAMS) Airport has an important role as the gateway of economic activity in Balikpapan, East Kalimantan. Elements of the airport consist of runways, taxiway, apron and the terminal building of departure and arrival. The runway has an important role as a key element in airport infrastructure, this is related to aircraft and passenger safety in air traffic at SAMS Airport, which is currently one of the best airports in Indonesia that meets the International Standard qualification. The purpose of this study is to perform visual assessment of runway deterioration at SAMS Airport using PCI (Pavement Condition Index) method, to know the factors affecting runway deterioration and the effective distress treatment to overcome deterioration at a runway. The visual assessment data are collected from PT. Angkasa Pura I (Persero) Sepinggan, by measuring the types and area of deterioration occurring on the runway during 1-month period (in September 2018), then PCI is analyzed by using ASTM D 5340 – 98. The results show that the PCI value is 80.4 which means the rating is excellent. The most common typical distress occurred at Threshold Runway 25 section 1 with the type of distress is block cracking which mainly caused by asphalt concrete shrinkage and daily temperature condition resulting in stress or strain series, another type is depression initially caused by the settlement from the soil foundation or construction process. Since PCI shows excellent state, the distress repair treatment to be performed is surface repair or routine maintenance with partial mill and overlay method.

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Study of soil structure interaction on basement wall with variants in distance and depth of the basement on soil class SE

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Journal of Physics: Conference Series 2020年第5期1529卷

作者： Yetty Saragi Masyhur Irsyam Roesyanto Hendriyawan University of HKBP Nommensen Sutomo Street No.4A Medan 20234 Indonesia Post Graduate Program Civil Engineering Departement University of Sumatera Utara Medan North Sumatera 20155 Indonesia Institute of Technology Bandung Ganesha 10 Bandung West Java 40135 Indonesia Civil Engineering Departement University of Sumatera Utara Medan North Sumatera 20155 Indonesia

The function of the basement is to carry the weight of the upper structure into the soil and to resist lateral loads around the basement wall. One aspect of geotechnical engineering that often a problem in basement wall planning is the determination of lateral ground pressure in the basement wall due to earthquake which must be held by the basement wall. In this study, an analysis of the effects of local soil conditions due to dynamic loads is done through analysis of soil-structure interaction. The analysis is done by modeling the local soil with variations in basement depth and the adjacent basement distance to get the lateral pressure distribution due to dynamic load. The analyzed soil conditions are considered homogeneous at land sites SE (soft soil) with the dynamic load input from earthquake loads uses a 10% probability of exceedance in 50 years (500 years). The most influential parameter for soil displacement is the distance of the basement and then the depth of the basement. The most influential parameter on lateral forces is the depth of the basement followed by the distance of the basement.

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The Effect of Mangrove on Fish Catch Using Belat at Teluk Pemedas and Sanipah of Kutai Kartanegara Regency, East Kalimantan Province, Indonesia 2

The Effect of Mangrove on Fish Catch Using Belat at Teluk Pe...

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2nd International Conference on Energy, environmental and Information System, ICENIS 2017

作者： Sulaiman, Bustam Bambang, Azis Nur Purnaweni, Hartuti Lutfi, Mohammad Doctoral Program of Environmental Science School of Postgraduate Studies Diponegoro University Semarang Indonesia Faculty of Fishery and Ocean Diponegoro University Semarang50275 Indonesia Master Program of Environmental Science School of Post Graduate Studies Diponegoro University Semarang50275 Indonesia Faculty of Social Science and Political Science Diponegoro University Semarang50275 Indonesia Department of Oil and Gas Processing Engineering STT MIGAS Balikpapan76127 Indonesia Department of Petroleum Engineering STT MIGAS Balikpapan76127 Indonesia

The increasing population at Teluk Pemedas and Sanipah coastal areas of Kutai Kartanegara Regency, East Kalimantan Province, has led to coastal degradation. The problem was mainly caused by conversion of mangrove into aquaculture, agriculture, plantation industrial, and residential areas. This research was a study case, used descriptive analysis to describe the local fishermen activity using belat traditional device to catch fish. The results revealed that there were many fishermen still did not know the benefits of mangrove for economy growth, ecological, ecotourism etc. This condition affects to the decline of the mangrove function. Fisherman who used belat often move from one location to another location in order to find places that have many catches. The belat which are placed in good environment mangrove areas produces lots of catches that greatly benefit the fisherman, therefore mangrove ecosystem must be well preserved for the sustainability of fishermen's efforts to earn a living. © 2018 The Authors, published by EDP Sciences.

关键词： Fish

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Development of a smartphone-based app for determination of formaldehyde concentration indoors 15

Development of a smartphone-based app for determination of f...

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15th Conference of the International Society of Indoor Air Quality and Climate, INDOOR AIR 2018

作者： Zhang, Siyang Shapiro, Nicholas Gehrke, Gretchen Castner, Jessica Liu, Zhenlei Guo, Beverly Zhang, Jianshun Haines, Sarah Kormos, David Frey, Paige Qin, Rongjun Dannemiller, Karen C. Department of Computer Science and Engineering Ohio State University United States Public Laboratory for Open Technology and Science Department of Mechanical and Aerospace Engineering Syracuse University Environmental Science Graduate Program Ohio State University United States Department of Civil Environmental and Geodetic Engineering College of Engineering Ohio State University United States Strand Associates Incorporated Department of Electrical and Computer Engineering Ohio State University United States Department of Environmental Health Sciences College of Public Health Ohio State University United States

ISBN: (纸本)9781713826514

Formaldehyde is a ubiquitous contaminant in the indoor environment that is both a carcinogen and irritant. The goal of this project is to develop a smartphone-based app for use by citizen scientists or researchers that can be paired with low-cost colorimetric badges for detection of indoor formaldehyde. We conducted both national and geographically-targeted surveys prior to app design. We have subsequently developed the app and conducted a beta test. Surveys of 147 individuals indicated broad public interest in formaldehyde testing using smartphone technology. Testing of the badges indicated consistent change in illumination with increasing formaldehyde exposure. Beta testing indicated users were able to navigate the existing app, and highlighted areas for improvement including incorporation of public surveys. Planned future analysis includes extensive calibration testing and a community-based field test. © 2018 15th Conference of the International Society of Indoor Air Quality and Climate, INDOOR AIR 2018. All rights reserved.

关键词： Formaldehyde

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Mechanisms of Geologically Stored CO2 for Energy Storage

SSRN

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SSRN 2019年

作者： Ogland-Hand, Jonathan D. Bielicki, Jeffrey M. Environmental Science Graduate Program Ohio State University 174 West 18th ColumbusOH43210 United States Department of Civil Environmental and Geodetic Engineering Ohio State University 2070 Neil Avenue ColumbusOH43210 United States John Glenn College of Public Affairs Ohio State University 1810 College Road ColumbusOH43210 United States

Carbon dioxide-Bulk Energy Storage (CO2-BES) is a bulk energy storage technology that uses carbon dioxide (CO2) in sedimentary basin geothermal resources to time-shift electricity production. Here, we investigated how the charging and discharging cycles affect the power storage capacity and power output capacity of a CO2-BES facility. We simulated the operation of CO2-BES with seven different operating cycles for fourteen years. Our results suggest that continuous charging and discharging cycles do not change the rate of heat depletion of the geothermal resource. But the power storage capacity and the power output capacity are affected because they rely on the magnitude of the overpressure. If, in a cycle, the duration of electricity dispatch is greater than the duration of electricity storage, overpressure may eventually deplete and a CO2-BES facility may cease to be operational. If idle periods where electricity is neither charged nor discharged are included in the cycle, there is a small increase in power output capacity and a small decrease in power storage capacity. In general, if electricity is dispatched and stored for equal amounts of time, the duration of dispatch/storage and of the idle period does not affect the power output capacity or the power storage capacity. As a result, as long as the cycles consist of equivalent charging and discharging durations throughout the lifetime of the facility, the length of those durations and frequency of idle periods could be based on financial incentives (e.g., diurnal variations in electricity prices), rather than process-level factors like the potential for heat or pressure depletion. © 2019, The Authors. All rights reserved.

关键词： Carbon dioxide

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