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International Workshop on Advances in Laboratory Testing of Liquefiable Soils and Nature Inspired Solutions for the Built Environment Conference, ISSMGE-TC101 and NISE 2022

作者： Nategh, Mehrdad Iravanian, Anoosheh Ekinci, Abdullah Department of Civil and Environmental Engineering Near East University 99138 Cyprus Department of Civil Engineering Aalto University Espoo Finland Civil Engineering Program Middle East Technical University Guzelyurt Turkey

ISBN: (纸本)9783031519505

In recent years, the number of monitoring techniques developed for management of natural and engineered ground systems such as slopes, embankments, and retaining walls has significantly in-creased. The current study examines a slope stability problem near Kyrenia Castle, a 7th century castle located in Northern Cyprus. The landslide and accompanying reinforced concrete/stone walls, constructed for rehabilitation purposes, are monitored for a period of two years. The current condition of the site is back-analysed using the finite element method (FEM) as a conventional analysis. To detect changes over time, close-range photogrammetry (CRP) is employed using photographs taken with an unmanned aerial vehicle (UAV) to generate a dense cloud model. The results demonstrate the compatibility of the CRP with FEM, making the technique a viable and efficient option for various engineered and natural ground systems. CRP is proved fast, cost-effective, sustainable, and non-destructive. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Landslides

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Analysis of the institutional development of drinking water supply systems in XYZ City,Indonesia coastal area

River

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River 2023年第2期2卷 158-168页

作者： Firdaus Ali Dwi L.Lestari Marsya D.Putri Khalidah N.Azmi Indonesia Water Institute South JakartaIndonesia Department of Civil Engineering Faculty of EngineeringEnvironmental Engineering Study ProgramUniversitas IndonesiaKampus UI DepokDepok CityIndonesia

Based on the Regulation of the Minister of Public Works and Public Housing Number 4 of 2020,drinking water supply management can stand alone or work together with other *** local government establishes a Regional Drinking Water Company which has responsibility for supplying drinking water at the regency/city *** coastal city as the object of study manages clean water then transfers under a private *** to government restrictions regarding the authority to provide clean water,a technical implementation unit was formed for better solution in clean water *** new form of institution will be able to make decisions and carry out execution at any time because it is directly under the authority of the government,it can also apply the concept of good governance to support more transparent *** accordance with the policy,the new institutional form will be able to finance itself,develop the level of service and contribute to regional development as a source of local ***,the institutional transition requires adaptation both from a functional and operational *** this study,an analysis of the readiness for the transition of institutional forms is carried out to minimize conflicts such the lack of improvement in the quality of drinking water services due to limited government authority,insufficient qualified human resources in water management,and the difficulty of developing drinking water service infrastructure because it still depends on the private *** analysis of the structure and human resources associated with clean water service targets also *** strengthening,both regulatory and institutional,is necessary to maximize the roles and functions of the relevant *** a more comprehensive understanding in the preparation of contracts and division of authority,no parties will be aggrieved in the long term.

关键词： clean water services human resources institutions

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Long-term performance: strength and metal encapsulation in alkali-activated iron ore tailings

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environmental Science and Pollution Research 2024年第34期31卷 47071-47083页

作者： Levandoski, William Mateus Kubiaki Ferrazzo, Suéllen Tonatto Piovesan, Maria Alice Bruschi, Giovani Jordi Consoli, Nilo Cesar Korf, Eduardo Pavan Graduate Program in Environmental Science and Technology Universidade Federal da Fronteira Sul RS Erechim99700-970 Brazil Graduate Program in Civil Engineering Universidade Federal Do Rio Grande Do Sul RS Porto Alegre90035-190 Brazil Undergraduate Program in Environmental and Sanitary Engineering Universidade Federal da Fronteira Sul RS Erechim99700-970 Brazil

Understanding the strength behavior and leaching characteristics of mining tailings stabilized with alkali-activated cements in the short, medium, and long term is crucial for the feasibility of material applications. In this context, this study assessed the stabilization/solidification of iron ore tailings (IOT) using alkali-activated binder (AAB) composed of sugarcane bagasse ash and eggshell lime at curing times of 7, 28, 60, 90, 180, and 365 days. Additionally, leaching tests were conducted, along with the examination of possible changes in the chemical and mineralogical composition resulting from exposure to acidic environments. Tests included unconfined compression strength (UCS), leaching, X-ray diffraction, and Fourier-transform infrared spectroscopy for the IOT-AAB mixtures. The highest increase in UCS was observed between 7 and 60 days, reaching 6.47 MPa, with minimal variation thereafter. The AAB-bonded IOT exhibited no metal toxicity over time. Elements Ba, Mn, Pb, and Zn present in IOT and ash were encapsulated in the cemented matrix, with complete encapsulation of all metals observed from 90 days of curing time. The mineralogy of the stabilized/solidified tailings showed no changes resulting from leaching tests. Characteristic bands associated with the presence of N-A-S–H gel were identified in both pre-leaching and post-leaching samples for all curing times analyzed. Exposure to acidic environments altered bands related to carbonate bonds formed in the IOT-AAB mixture. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Lime

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Mechanical Performance Improvement by Carbon Dioxide Curing of Cement Concrete Incorporating Oil Shale Residue 1st

Mechanical Performance Improvement by Carbon Dioxide Curing ...

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1st International Conference on Emerging Smart Cities, ICESC 2022

作者： Syuhada, Syahidus Al Salaheen, Marsail Alaloul, Wesam Salah Alzubi, Khalid Mhmoud Civil Engineering Study Program Department of Infrastructure Technology and Planning Institut Teknologi Sumatera Sumatera Indonesia Department of Civil and Environmental Engineering Universiti Teknologi PETRONAS Seri Iskandar Malaysia Department of Civil and Environmental Engineering Al-Husun University College Irbid Jordan

ISBN: (纸本)9789819911103

The influence of carbon dioxide (CO2) curing on the compressive strength of oil shale ash (OSA) concrete as partial cement replacement was investigated. 15 cm cubes with a 30% replacement percentage were tested after seven days of conventional curing and carbonation curing at 4 bar CO2 pressure. Research results demonstrate that CO2 curing influences the compressive strength of concrete significantly. There is a linear relationship between CO2 pressure and the duration of curing, as well as the compressive strength of OSA-based concrete. A sample of ordinary Portland cement was used as the control sample. The replacement of 30% cement by OSA increased the 7-day compressive strength from 48.5 to 55.5 MPa for plain cement samples and from 36.5 to 42.3 MPa for ash-based samples. From a technical standpoint, OSA-based concrete carbonation curing is still too immature for widespread application. Nonetheless, it is continuously developing in response to greenhouse gas reduction and paving the path for a more sustainable construction materials business. © 2024, Institute of Technology PETRONAS Sdn Bhd.

关键词： Carbon dioxide

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Effect of Coal Gasification Slag on Mass Transfer Resistance of Concrete 3rd

Effect of Coal Gasification Slag on Mass Transfer Resistance...

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3rd International Conference on Sustainable civil engineering and Architecture, ICSCEA 2023

作者： Thu, Ei Myat Kawai, Kenji Ogawa, Yuko Civil and Environmental Engineering Program Hiroshima University 1-4-1 Kagamiyama Hiroshima Higashihiroshima739-8527 Japan

ISBN: (纸本)9789819974337

Coal gasification slag (CGS) is discharged as a by-product of the integrated coal gasification combined cycle, which is a new generation technology that improves power generation efficiency compared to conventional coal thermal power generations and reduces carbon-dioxide emissions. The CGS has been attracted as a fine aggregate in concrete and was established as a new fine aggregate by Japanese Industrial Standards (JIS) in 2020. On the other hand, the properties of the concrete using CGS as a fine aggregate have not been clarified yet, and research on the contribution of CGS to the resistance of concrete is insufficient, although it has been suggested that CGS may have a reactivity similar to mineral admixtures. This paper has conducted a series of concrete experiments using CGS as a fine aggregate to explore the mass transfer resistance of concrete based on carbonation resistance and surface air permeability. Two mixture proportions with a water-to-cement ratio of 0.55 were prepared using CGS from the Nakoso power plant (CGSC) and the conventional crushed sand (NC) as fine aggregate. The unit water contents for the CGSC and NC were optimized to get the target slump and air content, and they were 162 and 172 kg/m3, respectively. All the concrete specimens were cured under the condition of two curing methods;7d-sealed, where the specimens were stored at 20 ± 2 ºC and 60 ± 5%RH after sealing for 7 days, and 28d-water, where they were stored at 20 ± 2 ºC and 60 ± 5%RH after curing in water at 20 ± 2 ºC for 28 days. As a result, CGSC showed better carbonation resistance, especially in 28d-water curing, and an equal or lower surface air permeability than NC. © 2024, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Slags

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Applicability of Electrical Resistance Method for Water Absorption Test on Cement Paste Using Mineral Admixture 3rd

Applicability of Electrical Resistance Method for Water Abso...

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3rd International Conference on Sustainable civil engineering and Architecture, ICSCEA 2023

作者： Nakamura, Taku Aoki, Takahiro George, Riya C. Ogawa, Yuko Kawai, Kenji Civil and Environmental Engineering Program Hiroshima University 1-4-1 Kagamiyama Hiroshima Higashihiroshima739-8527 Japan

ISBN: (纸本)9789819974337

While moisture is essential for the reaction of the binder in concrete, it is also known to be closely associated with degradation factors. Therefore, it is important to understand the internal water transfer for the maintenance and management of concrete structures. An embedded electrical resistance method, one of the electrical resistance methods, can finely grasp the moisture state in cement paste by the miniaturization of the electrode. However, its reproducibility and accuracy are still unclear, and it cannot be said to be a well-established method. It is also known that the pore structure becomes dense and the electrical resistance changes when mineral admixture is used because the electrical current flows through non-bonded water in hardened cement paste. Although the use of concrete with mineral admixtures has been increasing, there are still few examples of detailed studies on water transfer in this case. This study aims to examine the reproducibility and accuracy of the embedded electrical resistance method, and the results of the water absorption test using the electrical resistance method and the gravimetric method were compared by using cement paste with and without mineral admixtures. As a result, for almost all the mixture proportions, the moisture arrival distance at each measurement time measured by both methods was almost the same. The reproducibility of the electrical resistance method was confirmed by the fact that there was no significant variation in the arrival distance of moisture for each mixture. It may indicate that the electrical resistance method is applicable as a moisture transfer measurement method. © 2024, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Water absorption

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Cherenkov-Based Neutron Detector Design and Development for Advanced Reactors

Cherenkov-Based Neutron Detector Design and Development for ...

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2024 Annual Conference on Transactions of the American Nuclear Society, ANS 2024

作者： Strong, Jacob Snow, Jesse Cazalas, Edward Nuclear Engineering Program Department of Civil and Environmental University of Utah Salt Lake CityUT84112 United States

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Development of Rainfall-Runoff Model Using Mock Formula with the Calibration of Stream Discharge in Cisadane Watershed - Indonesia 1st

Development of Rainfall-Runoff Model Using Mock Formula with...

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1st International Conference on Emerging Smart Cities, ICESC 2022

作者： Hidayat, Dina P. A. Legowo, W. D. Sri Farid, Mohammad Doctoral Program of Civil Engineering Institut Teknologi Bandung Bandung Indonesia Water Resources Engineering Research Group Faculty of Civil and Environmental Engineering Institut Teknologi Bandung Bandung Indonesia Civil Engineering Department Universitas Trisakti Jakarta Indonesia

ISBN: (纸本)9789819911103

Rainfall-runoff model is one way to model the amount of rainfall that will become runoff and baseflow. Many models have been developed such as the Mock model which is quite simple but has a fairly good level of accuracy. This study aims to model rainfall runoff with the Mock formula and calibrate the model with measured discharge at one discharge station. This study uses the Cisadane watershed in West Java Indonesia for the location study and Serpong station as the discharge station. The modeling will be carried out with 2 scenarios, a monthly rainfall-runoff model in 1 year and the average monthly rainfall-runoff model for several years. The calibration parameter used is Nash Sutcliffe Efficiency (NSE) and coefficient of determination (R2). From the model results, it is obtained that the model calibration results with a fairly good measured discharge with a satisfactory NSE value and R2 is close to 1. © 2024, Institute of Technology PETRONAS Sdn Bhd.

关键词： Rain

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Study of Hybrid Steel Fibers Effects on the Workability and Compressive Properties of Non-proprietary UHPC 3rd

Study of Hybrid Steel Fibers Effects on the Workability and ...

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3rd International Conference on Sustainable civil engineering and Architecture, ICSCEA 2023

作者： Zhang, Ye Ogawa, Yuko Goegre, Riya Catherine Kawai, Kenji Civil and Environmental Engineering Program Graduate School of Advanced Science and Engineering Hiroshima University 1-4-1 Kagamiyama Higashi-Hiroshima Japan

ISBN: (纸本)9789819974337

Non-proprietary ultra-high-performance concrete (UHPC) is renowned for excellent mechanical properties, especially high compressive strength which is generally above 150 MPa. Despite the high compressive strength, the failure mode of non-proprietary UHPC under axial loading is sudden, brittle, and explosive. The undesired compression failure mode is not ideal for structure design and undermines the engineering value of non-proprietary UHPC. This research targets to convert the compression failure mode of non-proprietary UHPC from brittle to ductile with hybrid steel fiber reinforcement and select the most effective reinforcing proportion. In this research, a ground granulated blast-furnace slag (GGBS) based non-proprietary UHPC mix is reinforced with five combinations of two steel fiber types with straight ends. The lengths of the two steel fibers are 6.5 mm and 13 mm. The total volume fraction of steel fibers is 2%. The 28-day compressive strengths and the failure modes of the reinforced samples are compared to select a hybrid steel fiber combination that transforms the failure mode of non-proprietary UHPC and strengthens the compression performance most effectively. The experiment results demonstrate that: (1) with steel fibers presented, non-proprietary UHPC is capable of continuously taking compressive load after matrix cracks;(2) instead of explosive brittle failure mode, fiber reinforced non-proprietary UHPC fails in a ductile behavior under axial compression load and the samples stay in integrity;(3) hybrid steel fiber reinforcement is more effective than single type steel fiber reinforcement in improving the compression performance of non-proprietary UHPC. © 2024, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Compressive strength

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Frost Damage Resistance of Portland Blast-Furnace Slag Cement Concrete Cured Internally by Using Roof-Tile Waste Aggregate 2nd

Frost Damage Resistance of Portland Blast-Furnace Slag Cemen...

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2nd International Conference on Sustainable civil engineering and Architecture, ICSCEA 2021

作者： Kirimoto, Taishi Ogawa, Yuko Kawai, Kenji Civil and Environmental Engineering Program Graduate School of Advanced Science and Engineering Hiroshima University Higashihiroshima City Japan

ISBN: (纸本)9789811933028

The purpose of this study was to clarify the relationship between the internal curing effect of roof-tile waste aggregate and frost damage resistance, and to investigate the effects of the replacement ratio of roof-tile waste aggregate as well as curing conditions on the frost damage resistance of concrete. Five types of concrete using Portland blast-furnace slag cement were prepared with a water-to-cement ratio of 0.50 and different replacement ratios of roof-tile waste coarse aggregate (20% and 50% by volume) and roof-tile waste fine aggregate (23% and 58% by volume). Concrete specimens were cured at 20 °C under sealed condition for 3, 7, or 28 days, and they were subsequently exposed to air at 20 °C and 60%R.H. until the age of 28 days. Then, the tests for resistance of concrete to freezing and thawing were carried out for 300 cycles in water, and the relative dynamic modulus of elasticity as well as the mass loss was assessed at the designated periods. As a result, it was found that sufficient frost damage resistance could be secured when the replacement ratio of roof-tile waste aggregate was approximately 20% by volume, and the improvement in frost damage resistance was observed especially when fine aggregate was replaced. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Slags

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