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检索条件"丛书名=Lecture Notes in Civil Engineering"

共 6940 条记录，以下是541-550 订阅

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Use of Loess Stabilized with Hydraulic Binder as Construction Material of the Capping Layer and the Subbase Course Layer of a Road Structure 5th

Use of Loess Stabilized with Hydraulic Binder as Constructio...

引用

5th International Conference on Transportation Geotechnics

作者： Lenoir, Thomas Univ Gustave Eiffel MIT MAST F-44344 Bouguenais France

ISBN: (纸本)9789819782192;9789819782178;9789819782161

Loess is a geological formation with poor geotechnical performances. To upgrade and allow use of this kind of material in civil engineering projects, it is common to add few percent of hydraulic binders. However, the mechanical properties of those materials are often estimated. Their performances are thus sharply downgraded during structure design processes of road structures and their uses are generally limited to the capping layer. However, it is possible to measure accurately mechanical performances of these materials to use them in subbase layers of pavements. Based on results, a design has been proposed and implemented on a real scale test section. The test section has been instrumented with strain gauges and preliminary results are presented.

关键词： Earthworks Pavement design Cement-modified soils

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Personalised Environmental Control System (PECS) Based on a Small, Portable, and Stand-Alone Heat Pump 9th

Personalised Environmental Control System (PECS) Based on a ...

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9th International Building Physics Conference

作者： Gentile, Vincenzo Perino, Marco Politecn Torino Dept Energy DENERG I-10122 Turin Italy

ISBN: (纸本)9789819783151;9789819783137;9789819783120

This study investigates Personalized Environmental Comfort Systems (PECS) as a solution to address individual thermal comfort needs in office environments. Utilizing small Vapor Compression (VC) units to provide cooling has the potential to reduce central HVAC set points, resulting in energy savings. However, the main challenge for VC-based PECS is heat rejection. Outdoor expulsion requires significant building integration constraints, while indoor expulsion may cause discomfort and energy inefficiency. The proposed alternative approach involves storing heat during cooling periods and releasing it during off-peak hours. A compact water-to-water VC unit for desktop PECS applications was developed, tested, and connected to a water/PCM rejection tank. It can store condensation heat produced over 8 h of continuous operation while delivering an average cooling capacity of around 200 W, with COP higher than 2.

关键词： PECS Air Conditioning PCM storage proximity control

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Adsorption and Degradation Effects of Microorganisms Immobilized on Straw-Sludge-Based Humus for Phenanthrene in Water 6th

Adsorption and Degradation Effects of Microorganisms Immobil...

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6th International Conference on Advances in civil and Ecological engineering Research

作者： Yu, Hongyan Zhang, Xinxin Zhang, Ziying Taizhou Vocat & Tech Coll Taizhou Peoples R China

ISBN: (纸本)9789819616299;9789819616275;9789819616268

Microorganisms were immobilized on straw-sludge-based humus, and this material was employed to carry out remediation experiments of water samples contaminated by phenanthrene, a typical polycyclic aromatic hydrocarbon. Straw-sludge-based humus was prepared by hydrothermal humification, and the degradation bacteria were obtained by screening phenanthrene-contaminated water samples treated by adsorption with humus. The bacteria were denoted by Yarrowia lipolytica Tzyx3. The chemical adsorption and biodegradation effects of the humus-immobilized microbial inoculum for phenanthrene in water and their correlation were studied. The relative contributions of chemical adsorption and biodegradation to the phenanthrene removal rates were accurately quantified. The results showed that on the prerequisite of 9 g/L humus or humus-immobilized microbial inoculum and a similar initial number of viable microorganisms, the removal rate with humus alone was 46.72%, and the phenanthrene degradation rate with free Yarrowia lipolytica Tzyx3 strains was 57.03%. In contrast, the removal rate of phenanthrene with the humus-immobilized microbial inoculum reached 78.55%, lower than the sum of the removal rates due to adsorption with humus and degradation with free strains yet higher than that due to adsorption with humus alone and degradation with the bacteria alone.

关键词： Straw-sludge-based humus Degrading bacteria Immobilization Chemical adsorption Biodegradation

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Large-Span Soil-Steel Structures in the Mining Industry

Large-Span Soil-Steel Structures in the Mining Industry

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2023 Canadian Society for civil engineering Annual Conference

作者： Embaby, Kareem El Naggar, Hesham El Sharnouby, Meckkey AECOM New York NY 10004 USA Western Univ London ON N6A 3K7 Canada Atlantic Ind Ltd Ayr ON N0B 1E0 Canada

ISBN: (纸本)9783031615375;9783031615351;9783031615344

Soil-steel structures play an important role in the infrastructure of mining industry. The ease to ship and construct in remote locations distinguishes this system comparing to conventional concrete and steel structures. In addition, the ability to dismantle the structural system and restore the site to the initial condition with the least environmental cost at the end of mining projects is considered a great asset to the environment. Soil-steel structures are widely used in supporting heavy haul roads subjected to excessive loadings. This study presents a three-dimensional numerical investigation for soil-steel structures subjected to various heavy weight haul trucks. The numerical technique is validated by the field measurements of a fully monitored 10.0 m span soil-steel structure subjected to tandem axle loading until failure. The numerical simulation succeeded to capture the ultimate capacity of the steel structures under truck loading conditions. The validated numerical technique is then used to investigate the ultimate behavior of the world's largest-span soil-steel structure with a span exceeding 32 m. The results demonstrated the ability of soil-steel structures in sustaining various haul trucks with gross weight of more than 850 tons.

关键词： Culvert Nonlinear finite element Buried bridges Threedimensional modeling Collar End treatment

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Semi-Automated Digital Design Assistant for Frame Bridges 20th

Semi-Automated Digital Design Assistant for Frame Bridges

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20th International Conference on Computing in civil and Building engineering-ICCCBE

作者： Becker, Amelie Grave, Jakob Bartels, Niels Maximilian Marx, Steffen Univ Appl Sci Cologne D-50968 Cologne Germany Tech Univ Dresden D-01219 Dresden Germany

ISBN: (纸本)9783031842108;9783031842085;9783031842078

The high number of bridges in Germany that are in a structurally inadequate condition will lead to a great demand for planning services in the field of bridge construction in the coming years. To meet this demand, the planning process of bridge structures must be accelerated. Digital planning methods such as Building Information Modelling (BIM) form a crucial basis for acceleration. Against this background, this paper will present a solution-based approach for a semi-automated Digital Design Assistant (DDA), based on the German guideline for Railroad Bridges Ril 804.9040. To develop the DDA, the design constraints of the planning and construction process are first evaluated, categorized and prioritized. This includes a full literature review as well as an evaluation of the DDA planning process through use cases in real projects. Based on these results, design constraints are integrated in the BIM model. With the help of programming and the integration of parametric component classes, design results are automated and presented more efficiently and clearly, in comparison to previously labor-intensive modelling. The presentation of the design results are shown in a process chart that summarizes inputs, modelling steps and results of the DDA. In a third step, the parametric component classes are programmed and implemented in a commonly used BIM Software (Revit), and validated in an example project as a Proof-Of-Concept. The results show that the approach developed for the DDA can support the design process and should be implemented for other countries and standards. The design variants generated with the help of a DDA are considered to be both accurate and implementable. However, the case study also shows that the DDA only serves as a support by rapidly generating design solutions, but cannot replace the engineer's role in choosing the right one.

关键词： Digital Design Assistant Bridge Design Building Information Modelling (BIM)

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Industrial Archaeologies of Complex Palimpsests. Application of Semantic Web Technologies to Digitalise the Knowledge Path from Data to Interpretation 11th

Industrial Archaeologies of Complex Palimpsests. Application...

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11th International Conference of Ar.Tec.

作者： Cui, Cassia De Lian Cursi, Stefano Simeone, Davide Fioravanti, Antonio Curra, Edoardo Sapienza Univ Rome I-00184 Rome Italy CNR ISPC Inst Heritage Sci I-00010 Montelibretti RM Italy Univ Brescia I-25123 Brescia Italy

ISBN: (纸本)9783031718571;9783031718557;9783031718540

Semantic web technologies are today widely used across the Architecture, engineering and Construction (AEC) sector for different scopes and activities during the building life cycle and the operation and maintenance phase. In the heritage field, the development of several methods to facilitate information exchange and interoperability between stakeholders represents a crucial issue in the current research scenario. Building information modelling and related technologies can address some of these challenges and limitations through relational database structure. However, there are still some open questions related to knowledge representation and management of complex heritage sites. This paper outlines the use of semantic web technologies and standards, such as Web Ontology Language and existing domain ontologies, to digitalize the knowledge path from data collection to interpretation for the documentation of heritage assets. Firstly, it briefly defines the methodologies, data structure, exchange formats, and relations of the different technology databases with their application in the digital interpretative processes. Then, the proposed framework is evaluated through an example of industrial archaeology application in a multi-layered historical site. The aim is to propose a framework to manage different information classes, inconsistencies and uncertainties, from preliminary data gathering and structuring to ontologies instantiation activity by representing the logical levels of connection. The final intent is to highlight the possibility of overcoming the limitations in the different heritage study and management approaches to give proper support during the decision-making process performed by multiple stakeholders.

关键词： Heritage Assets Industrial Archaeology Semantic Web Technologies Ontologies Information Exchange and Interoperability

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Damage to Technical Elements of the Building Envelope in the Typical Multi-Risk Scenario of the Campi Flegrei Area 11th

Damage to Technical Elements of the Building Envelope in the...

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11th International Conference of Ar.Tec.

作者： Castelluccio, Roberto Vitiello, Veronica Marmo, Rossella Fraiese, Mariacarla Univ Naples Federico II Dept Civil Bldg & Environm Engn Piazzale Vincenzo Tecchio 80 I-80125 Naples Italy

ISBN: (纸本)9783031718656;9783031718632;9783031718625

Damage to technical elements of the building envelope can have unacceptable consequences for the functionality and safety of a building. Recent interest in such damage is mostly linked to intensive events, neglecting the study of extensive events. Despite the known connection between technical envelope vulnerability and building functionality and safety, systematic vulnerability studies are missing. This study proposes investigation sheets for damaged technical elements as preliminary tools for assessing envelope vulnerability and hazardous events, related to this vulnerability, in urban areas. The study focuses on frequent but non-catastrophic hazards, typical of the Campi Flegrei area, where recent bradyseismic activity has renewed national interest and necessitated risk prevention measures. The research methodology involves three phases: identification of the most vulnerable technical elements, comparison with bibliographic data, and direct application in a multi-risk scenario, specifically bradyseismic activity combined with different environmental exposures. Analysis reveals balconies and cornices as the most frequently damaged elements, particularly vulnerable to bradyseismic activity and environmental exposure. Associations between observed damage and hazard characteristics will support the identification of the degradation pattern of technical elements which is needed to analyse their vulnerability and to assess the risk onto the urban system associate with it.

关键词： Building Risk Building Envelope Bradyseism Multi-risk Damage

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Effect of Supernatant from Cement Suspension with High Water-to-Cement Ratio on Early Hydration and Performance of Cement Paste 2nd

Effect of Supernatant from Cement Suspension with High Water...

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2nd International Conference on Geosynthetics and Environmental engineering

作者： Liu, Mengdi Liu, Engui Xian Jiaotong Liverpool Univ Dept Civil Engn Suzhou 215123 Jiangsu Peoples R China

ISBN: (纸本)9789819777686;9789819777662;9789819777655

Nanomaterials have been extensively researched as new concrete admixtures capable of enhancing properties through filler and chemical reaction effects. However, their potential remains largely untapped due to challenges in dispersion and high costs. This study explored using cement suspension as a mixing water, considering the suspension contained certain nano-scaled particles. Suspensions were prepared via hydrolysis reaction by exposing cement to a water solution at a ratio of c/w 1:10. The earlier compressive strength results indicated the ultra-fine particles from the suspension penetrated cement hydration pores to provide a dense hydration structure. Their nucleation and chemical activity also accelerated cement hydration. Moreover, compound characterization, including X-ray diffraction (XRD), Thermogravimetric analysis (TGA), and Scanning Electron Microscopy (SEM) was performed to unravel the mechanism in terms of phase formation and microstructure.

关键词： Nanoparticles Cementitious materials Early hydration Microstructural characterization

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Insight on the Durability of Steel Reinforced Grout (SRG) Systems for the Strengthening of Historical Constructions 5th

Insight on the Durability of Steel Reinforced Grout (SRG) Sy...

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5th International Conference on Protection of Historical Constructions-PROHITECH

作者： Fares, Sara Meriggi, Pietro De Santis, Stefano de Felice, Gianmarco Roma Tre Univ Dept Civil Comp Sci & Aeronaut Technol Engn Via Vito Volterra 62 I-00146 Rome Italy

ISBN: (纸本)9783031873140;9783031873126;9783031873119

Steel reinforced grout (SRG) composites, due to their high performance, proved effective for the external strengthening of existing structures and for the seismic protection of historical constructions. Nonetheless, to comply with the conservation criteria for ancient buildings, they have to ensure an adequate level of durability against environmental agents. Within this framework, the study aims to investigate the durability of galvanized (zinc-coated) SRG, the most adopted typology today, considering four different textiles and four cement or lime mortars, and the most critical aging conditions for the tensile behaviour. Tensile tests were conducted following immersion in saltwater and alkaline solutions, exposure to freeze-thaw cycles, aggressive soil conditions, and high temperatures. The results demonstrated the beneficial performance of galvanized SRG while also identifying some issues that warrant further investigation. These findings suggest the need for a more thorough evaluation of its appropriate use for the long-term preservation of built and historical heritage.

关键词： Corrosion Fabric Reinforced Cementitious Matrix (FRCM) freezing-and-thawing strengthening substitute ocean water zinc coating

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Climate Resilience and Energy Harvesting of Thermo-Active Roads 5th

Climate Resilience and Energy Harvesting of Thermo-Active Ro...

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5th International Conference on Transportation Geotechnics

作者： Cao, Benyi Jin, Fei Rengaraju, Sripriya Al-Tabbaa, Abir Univ Surrey Sch Sustainabil Civil & Environm Engn Guildford Surrey England Cardiff Univ Sch Engn Cardiff Wales Univ Cambridge Dept Engn Cambridge England

ISBN: (纸本)9789819782390;9789819782376;9789819782369

The climate is changing rapidly, altering the long-term environmental loading parameters of roads. Increased frequency and severity of extreme weather events cause serious road damage and transport disruption, including melting roads in heatwaves and potholes due to freeze-thaw cycles, with highway repair and maintenance costing England alone 1.4 pound billion in 2021/2022. The recently established UK projects SaFEGround, DigitalRoads, and an RAEng Research Fellowship will synergise ideas and methods to develop low-carbon and resilient roads. In particular, the RAEng Research Fellowship involves deploying an innovative shallow geothermal energy system (SGES) for subgrade heat storage/extraction and pavement temperature regulation. Such research is at the forefront of Transport and Energy Geotechnics. Very little research has been conducted on the pavement-pipe-subgrade SGES and factors affecting their performances, especially in the field of civil engineering (e.g. thermal properties enhancement of subgrade materials, pavement/pipe/subgrade interaction, complex thermo-mechanical behaviour under extreme climates). This paper provides an overview of the systematic research approach that fully characterises thermally improved road materials via physical modelling, finite element numerical analysis, field trials and LCA, with some preliminary results analysed. The proposed thermo-active road technology would be applicable to a wide range of transport projects in many regions to reduce climate-related road maintenance costs and carbon emissions.

关键词： Climate Resilience Thermo-active Pavement

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