Dealing With Sedimental Transport Over Partly Non-Erodible Bottoms,
2012
Utah State University
Dealing With Sedimental Transport Over Partly Non-Erodible Bottoms, François Rulot, Benjamin Dewals, Pierre Archambeau, Michael Pirotton, Sébastien Erpicum Hece
International Junior Researcher and Engineer Workshop on Hydraulic Structures
ABSTRACT: In depth-averaged flow and morphodynamic models using a finite volume discretization based on explicit time integration, a specific difficulty can arise during a computation: the computed sediment level can become lower than the level of a non-erodible bottom. The original developments presented in this paper enable correction of the non-physical sediment levels. The method, based on iterative limitation of the outward fluxes, is perfectly mass conservative and remains computationally efficient. The resulting model has been validated with several 1D benchmarks leading to configurations with sediment transport over a nonerodible bottom. Two interesting experimental benchmarks are highlighted in this paper …
Using Mercury Intrusion Porosimetry To Study The Interfacial Properties Of Cement-Based Materials,
2012
Department of Architecture, China University of Science and Technology, Taipei City, Taiwan, R.O.C.
Using Mercury Intrusion Porosimetry To Study The Interfacial Properties Of Cement-Based Materials, Shih-Wei Cho
Journal of Marine Science and Technology
Cement-based material is a typical porous composite material. Pore structures and interfacial properties of cementbased materials are influenced properties of ion transport behavior and durability. This study determines pore structure by employing mercury intrusion porosimetry (MIP), with mortar specimens manufactured with three different watercement (w/c) ratios and five volume proportions of fine aggregate to investigate interfacial properties. The experimental results show that total mercury intrusion decreases with an increase in sand volume proportion when comparing the same w/c ratio. The calculated mercury intrusion of interfacial transition zone increases with w/c and the volume proportion of fine aggregate.
Impact Abrasion Of Hydraulic Structures Concrete,
2012
Department of Civil and Water Resource Engineering, National Chiayi University, Chiayi, Taiwan, R.O.C.
Impact Abrasion Of Hydraulic Structures Concrete, Yu-Wen Liu, Shi-Wei Cho, Tsao-Hua Hsu
Journal of Marine Science and Technology
Most of the abrasion damage is caused by the action of water-borne particles (silt, sand, gravel, and other solid) impacting and rolling against the concrete surface during hydraulic structure operation. In this paper solid-particle abrasion of concrete containing slag was studied. Experiments included use of river sand abrade of mean diameter ~ 0.6, 1.2, 2.5 and 5 mm, and sand content was 110, 230 and 340 kg per 1 m3 of water, impacting at 30°, 45° and 90° to the concrete surface. And the waterborne sand flow impact test method was used. Test results show that the abrasion rate to …
Prediction Model Of Air-Borne Salt Distribution In The Coastal Region Of Northern Taiwan,
2012
Taiwan Construction Research Institute, Taipei, Taiwan, R.O.C.
Prediction Model Of Air-Borne Salt Distribution In The Coastal Region Of Northern Taiwan, Yu-Sheng Chen, Hui-Jen Chiu, Yi-Wen Chan, Yung-Chang Chang, Chung-Chia Yang
Journal of Marine Science and Technology
Taiwan is located in subtropical region, where temperature and humidity are relatively high all year round. Besides, the island is surrounded by ocean that the air-borne salt (ABS) attack is one of the major concerns for concrete structures. In this paper, a prediction model for the distribution of air-borne salt in the coastal region of northern Taiwan is proposed based on the result of ABS measurement at 38 sites near a period of four years. The ABS content was calculated monthly based on the salt concentration, water amount, time, and area of entrance. The monthly measured ABS of the entire …
Mechanical Properties Of Recycled Aggregate Concrete With Deformed Steel Re-Bar,
2012
Department of Civil & Environmental Engineering, Hanyang University, Korea.
Mechanical Properties Of Recycled Aggregate Concrete With Deformed Steel Re-Bar, Yongjae Kim, Jongsung Sim, Cheolwoo Park
Journal of Marine Science and Technology
This study investigates fundamental properties of the recycled aggregate which was produced through recent hi-technique of recycling. In addition, the mechanical properties of the concrete that was made by the recycled aggregate were compared to the concrete made of natural aggregate. The primary objective of this study was to characterize the concrete-rebar bonding properties of the recycled aggregate concrete. The recycled aggregate concrete showed about 18% decreased bond strength as compared to the natural aggregate concrete. The current prediction equation of bond strength suggested by the design specification does not consider this decreased bond strength by the use of the …
The Relationship Between Migration Time In Acmt And Ponding Time In Ponding Test For Cementitious Materials,
2012
Institute of Materials Engineering, National Taiwan Ocean University, Keelung, Taiwan, R.O.C.
The Relationship Between Migration Time In Acmt And Ponding Time In Ponding Test For Cementitious Materials, Chung-Chia Yang, Yu-Ming Tsai, Kuo-Cheng Yang
Journal of Marine Science and Technology
The objective of this study is to investigate the relationship between the diffusion behaviors of chloride ions and the migration of chloride ions in the cementitious materials. Different kinds of mortars with different binder combination (fly ash, slag and fly ash plus slag) and w/b ratios (w/b = 0.35, 0.45, 0.55, and 0.65) were used. In this study, the diffusion test and the migration test were carried out with the ponding test (AASHTO T259) and the accelerated chloride migration test (ACMT), respectively. The chloride profiles were obtained under different ponding time with ponding test and different migration time with ACMT. …
The Study Of Chloride Ion Transport Behavior Of Mortar Under Different Storing Environment Temperatures,
2012
Institute of Materials Engineering, National Taiwan Ocean University, Keelung, Taiwan, R.O.C.
The Study Of Chloride Ion Transport Behavior Of Mortar Under Different Storing Environment Temperatures, Shih-Han Weng, Chung-Chia Yang, Shih-Wei Cho, Kuo-Cheng Yang
Journal of Marine Science and Technology
This study presents the chloride ion transport behavior of mortar from accelerated chloride migration test (ACMT). The water/cement ratio of mortars is 0.45, and the five volume fractions of fine aggregates (0%, 15%, 30%, 50% and 60%) were evaluated. After stored under different environment temperatures (25°C, 40°C, 60°Cand 80°C), the chloride ion passing through specimens was carried out with ACMT. From the Nernest-Planck equation and modified Fick’s second law, test data could be calculate the chloride migration coefficient of non-steady-state and steady-state. For mortar structure, dilution and tortuosity effects are positive effect to resist the penetration of Chloride ion. On …
Effect Of Water Soluble Polymer And Fiber On The Early-Age Shrinkage Cracking Of Cementitious Composites,
2012
Nan Shing Color Co., Ltd., Taipei, Taiwan; College of Engineering, Tatung University, Taipei, Taiwan, R.O.C.
Effect Of Water Soluble Polymer And Fiber On The Early-Age Shrinkage Cracking Of Cementitious Composites, Shih-Tang Lin, Ran Huang, Tsai-Lung Weng
Journal of Marine Science and Technology
Both polymeric fiber and water soluble polymer (WSP) have been reported effective in reducing early-age shrinkage cracking. The synergistic effect of cellulose based WSP and fiber on reducing early-age shrinkage cracking of cementitious composite exposed to a constant evaporation rate of 1 kg/(h.m2) environment was investigated in this paper. A fixed ratio of WSP was employed in the poly-acrylic fiber reinforced cementitious composites with various fiber content and aspect ratios. Results indicate that the addition of polymeric fibers reduced plastic shrinkage cracking, such as the total crack area, the average crack width and cracks wider than 1.5 mm. Further reductions …
Effect Of Ground Granulated Blast Furnace Slag On Mechanical Behavior Of Pva-Ecc,
2012
Department of Civil Engineering, National Taiwan University, Taipei, Taiwan, R.O.C.
Effect Of Ground Granulated Blast Furnace Slag On Mechanical Behavior Of Pva-Ecc, Ing Lim, Jenn-Chuan Chern, Tony Liu, Yin-Wen Chan
Journal of Marine Science and Technology
As the most popular construction material, concrete has many advantages compared to other materials. However, its brittle nature causes cracking and results in many deterioration problems and failures in infrastructures. Considering the issue of sustainability, researchers around the world have conducted numerous studies to develop concrete that has better performances, higher durability, longer life span, and less damaging effects to nature. To obtain such characteristics, researchers not only focus on strength enhancement, but also ductility and toughness. This paper examines the effect of using ground granulated blast furnace slag as partial cement replacement in producing engineered cementitious composite (ECC), a …
Analysis Of Influential Factors And Association Rules For Bridge Deck Deterioration With Utilization Of National Bridge Inventory,
2012
Graduate Institute of Construction Engineering and Management, National Central University, Taoyuan, Taiwan, R.O.C.
Analysis Of Influential Factors And Association Rules For Bridge Deck Deterioration With Utilization Of National Bridge Inventory, Rong Yau Huang, Ping Fu Chen
Journal of Marine Science and Technology
Bridge is the hub of the roads and plays a crucial role in transportation. In recent years, the age of most bridges in Taiwan has gotten old gradually; as a result, the bridges deteriorate and need to be fixed and maintained. Nevertheless, it is not easy to predict the timing of bridge deterioration, and such situation has become one of the important issues in introducing the concept of preventive maintenance. In fact, in order to control the condition of bridge deterioration, many countries have set up bridge management system and regulated methods and mechanism of inspection. The record of bridge …
Effective Asr Inhibiting Length And Applied Electrical Field Under Accelerated Lithium Migration Technique,
2012
Department of Civil Engineering, Chung Yuan Christian University, ChungLi, Taiwan, R.O.C.
Effective Asr Inhibiting Length And Applied Electrical Field Under Accelerated Lithium Migration Technique, Wei-Chien Wang, Chih-Chien Liu, Chau Lee
Journal of Marine Science and Technology
This study investigates the effective concrete length and electric field strength during Accelerated Lithium Migration Technique (ALMT) application for the inhibition of the alkali-silica reaction (ASR). Concrete specimens measuring 10 cm in diameter and 5, 7, 9, 11, 14, 17, 20 and 23 cm in length are fabricated. Specimens with 5, 7, and 9 cm in length are applied 9 A/m2 constant current density, and the rest specimens are applied 60 V constant voltage. After the ALMT process, the specimen is cut every 0.5 cm and analyzed its cation content. Experimental results shows that if the aim of ASR inhibition …
Performance-Based Plastic Design And Energy-Based Evaluation Of Seismic Resistant Rc Moment Frame,
2012
Department of Civil Engineering, National Taiwan University, Taipei, Taiwan.
Performance-Based Plastic Design And Energy-Based Evaluation Of Seismic Resistant Rc Moment Frame, Wen-Cheng Liao, Subhash C. Goel
Journal of Marine Science and Technology
This paper presents first time application of the Performance-Based Plastic Design (PBPD) approach to seismic resistant reinforced concrete special moment frames (RC SMF). Four baseline RC SMF (4, 8, 12 and 20-story) as used in the FEMA P695 were selected for this study. Those frames were redesigned by the PBPD approach. The baseline code designed frames and the PBPD frames were subjected to extensive inelastic pushover and time-history analyses. It turns out that the work-energy equation in PBPD to determine design base shear can also be used to estimate seismic demands, herein called the energy spectrum method. In summary, this …
Effect Of Alkaline Solutions On Engineering Properties Of Alkali-Activated Ggbfs Paste,
2012
Department of Construction Engineering, National Taiwan University of Science and Technology, Taipei City, Taiwan, R.O.C.
Effect Of Alkaline Solutions On Engineering Properties Of Alkali-Activated Ggbfs Paste, Tzong-Ruey Yang, Ta-Peng Chang, Bo-Tsun Chen, Jeng-Ywan Shih, Wei-Lun Lin
Journal of Marine Science and Technology
In this study, two kinds of alkaline solutions, sodium hydroxide (NaOH) and sodium silicate (Na2SiO3), with three dosages of 0.5, 1.0 and 1.5% by weight were used to produce the alkali-activated ground granulated blast furnace slag (GGBFS) paste at three different liquid-solid ratios by weight of 0.45, 0.5 and 0.55. Most engineering properties of the paste were examined at age of 3, 7, 14, 28 and 56 days. Experimental results show that a mixed alkaline solution of sodium hydroxide and sodium silicate is necessary to produce an alkaliactivated GGBFS paste with adequate workability and strength. Both the liquid-solid ratio and …
A Study Of Statistical Models Application For Mixture Of High-Flowing Concrete,
2012
Department of Civil Engineering, National Taiwan University, Taipei, Taiwan.
A Study Of Statistical Models Application For Mixture Of High-Flowing Concrete, Ming-Chih Li, Yu-Sheng Chen, Yin-Wen Chan, Vihn Long Hoang
Journal of Marine Science and Technology
High flowing concrete (HFC) is defined as a concrete that exhibits a high deformability and a good resistance to segregation. The grade of workability for HFC is concrete slump flow that between 50 to 70 cm. In the research, 21statistically balanced concrete mixtures were investigated by statistical models, and discussed further the workability, strength and durability properties of concrete, which are responded by granulated ground blastfurnace slag (GGBS), Fly ash, waterbinder ratio (w/b) and superplasticizer (sp). The Box-Wilson central composite design (CCD) method is used in this study. The total binder content is 375 kg/m3 , and four independent variables …
Model-Based Approach To Account For The Variation Of Primary Voc Emissions Over Time In The Identification Of Indoor Voc Sources,
2012
BEESL Lab., Syracuse University
Model-Based Approach To Account For The Variation Of Primary Voc Emissions Over Time In The Identification Of Indoor Voc Sources, Kwanghoon Han
Kwanghoon Han
The study objectives were to improve the understanding of the long-term variation of VOC emission chromatograms of building materials and to develop a method to account for this variation in the identification of individual sources of VOC emissions. This is of importance for the application of the source identification method since materials age over time in real indoor environments. The method is based on the mixed air sample measurements containing pollutants from multiple aged materials and the emission signatures of individual new materials determined by PTR-MS. Three emission decay source models were employed and evaluated for their ability to track …
Hardy, Nathaniel (Sc 524),
2012
Western Kentucky University
Hardy, Nathaniel (Sc 524), Manuscripts & Folklife Archives
MSS Finding Aids
Finding aid and scan (Click on "additional files" below) for Manuscripts Small Collection 524. Receipt written15 June 1836 by Nathaniel Hardy of Day, Schmitz and Baldwin, Louisville, Kentucky, to Eli McLean, South Union, Kentucky, for payment of $300 on castings for water works for the Shaker Society at South Union.
Rainfall Organization And Geomorphologic Controls On The Flood Response Of Mild-Slope Basins In The South Atlantic Region Of Us,
2012
University of Connecticut - Storrs
Rainfall Organization And Geomorphologic Controls On The Flood Response Of Mild-Slope Basins In The South Atlantic Region Of Us, Yiwen Mei
Master's Theses
This study uses data from the Tar-River Basin in North Carolina to explore how space-time rainfall variability influences the hydrologic response from observational and modeling perspectives. For understanding the basin scale effect, the Tar-River Basin is divided into four cascade sub-basins ranging from 1106 km2 up to 5654 km2. The study evaluates the catchments’ response to rainfall for a large number of storm events by computing the event runoff coefficient based on streamflow observations and through simulations from a semi-distributed hydrological model. Comparison of observed to simulated hydrographs from the hydrological model shows that distributed rainfall forcing …
Concentration Effects And Ion Properties Controlling The Fractionation Of Halides During Aerosol Formation,
2012
University of Kentucky
Concentration Effects And Ion Properties Controlling The Fractionation Of Halides During Aerosol Formation, Marcelo I. Guzman, Richa R. Athalye, Jose M. Rodriguez
Chemistry Faculty Publications
During the aerosolization process at the sea surface, halides are incorporated into aerosol droplets, where they may play an important role in tropospheric ozone chemistry. Although this process may significantly contribute to the formation of reactive gas phase molecular halogens, little is known about the environmental factors that control how halides selectively accumulate at the air-water interface. In this study, the production of sea spray aerosol is simulated using electrospray ionization (ESI) of 100 nM equimolar solutions of NaCl, NaBr, NaI, NaNO(2), NaNO(3), NaClO(4), and NaIO(4). The microdroplets generated are analyzed by mass spectrometry to study the comparative enrichment of …
Structural Properties Of Iclt Wall Panels Composed Of Beetle Killed Wood,
2012
Brigham Young University - Provo
Structural Properties Of Iclt Wall Panels Composed Of Beetle Killed Wood, David Edward Wilson
Theses and Dissertations
Interlocking Cross Laminated Timber (ICLT) wall panels are a new wood construction product similar to Cross Laminated Timber panels. Besides being an innovative structural system, they also utilize beetle killed timber from many of the forests that have been devastated by the Mountain Pine Beetle. Three tests were performed on three ply ICLT panels measuring 8 feet (2.44m) wide, 8 feet (2.44m) tall and 8.5 inches (21.6cm) thick to determine the racking, flexural and axial strengths of the wall panels. After each test was performed the walls were disassembled and investigated for cause of failure. Using the data from the …
Cyber-Physical Integration To Connect Vehicles For Transformed Transportation Safety And Efficiency,
2012
University of Massachusetts - Amherst
Cyber-Physical Integration To Connect Vehicles For Transformed Transportation Safety And Efficiency, Daiheng Ni, Hong Liu Liu, Wei Ding, Yuanchang Xie, Honggang Wang, Hossein Pishro-Nik, Qian Yu
Daiheng Ni
In this paper, we explore a distributed cyber-physical solution using connected vehicle technology (CVtech) to substantially mitigate transportation systems' safety and efficiency problems. Future vehicles, by communicating with other vehicles (V-V), roadside infrastructures (V-R), and personal com-munication devices (V-P), will adapt to the external regional environment and consequently avoid collisions and congestion. We proposes to seamlessly int e-grate networked and embedded sensing, computational intelligence, and real - time communication (cyber) into transportation infrastructure including veh i- cles and roadsides (physical) to facilitate self - organization and system coordin a- tion. Specifically, this research addresses two specific t hemes: Foundations by …
