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Electrical Imaging and Numerical Sim...
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Smyl, Danny James.
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Electrical Imaging and Numerical Simulation of Unsaturated Moisture Flow in Cement-Based Materials.
紀錄類型:
書目-電子資源 : Monograph/item
正題名/作者:
Electrical Imaging and Numerical Simulation of Unsaturated Moisture Flow in Cement-Based Materials./
作者:
Smyl, Danny James.
出版者:
Ann Arbor : ProQuest Dissertations & Theses, : 2017,
面頁冊數:
145 p.
附註:
Source: Dissertation Abstracts International, Volume: 79-04(E), Section: B.
Contained By:
Dissertation Abstracts International79-04B(E).
標題:
Civil engineering. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10708404
ISBN:
9780355458893
Electrical Imaging and Numerical Simulation of Unsaturated Moisture Flow in Cement-Based Materials.
Smyl, Danny James.
Electrical Imaging and Numerical Simulation of Unsaturated Moisture Flow in Cement-Based Materials.
- Ann Arbor : ProQuest Dissertations & Theses, 2017 - 145 p.
Source: Dissertation Abstracts International, Volume: 79-04(E), Section: B.
Thesis (Ph.D.)--North Carolina State University, 2017.
Deterioration of concrete structures generally occurs in the presence of moisture. Moisture is essential for the majority if the deterioration processes and also facilitates transport of aggressive agents that contribute to corrosion of reinforcing steel or degradation and transformation of hydration products. Due to environmental exposure, temperature and the degree of moisture saturation fluctuate throughout the service life of a structure.
ISBN: 9780355458893Subjects--Topical Terms:
860360
Civil engineering.
Electrical Imaging and Numerical Simulation of Unsaturated Moisture Flow in Cement-Based Materials.
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Source: Dissertation Abstracts International, Volume: 79-04(E), Section: B.
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Advisers: Mohammad Pour-Ghaz; Gregory Lucier.
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Thesis (Ph.D.)--North Carolina State University, 2017.
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Deterioration of concrete structures generally occurs in the presence of moisture. Moisture is essential for the majority if the deterioration processes and also facilitates transport of aggressive agents that contribute to corrosion of reinforcing steel or degradation and transformation of hydration products. Due to environmental exposure, temperature and the degree of moisture saturation fluctuate throughout the service life of a structure.
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The kinetics of moisture ow considering the coupling of variable saturation and distributed damage (cracking) are complex. This complexity has led to significant challenges in understanding moisture transport in unsaturated cement-based materials. It is therefore no surprise that material models, simulation methods, and visualization techniques are underdeveloped for damaged, unsaturated cement-based materials. Yet, such knowledge and modeling techniques are essential in service-life predictions and assessment of built structures.
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This thesis aims to deepen fundamental understanding of unsaturated moisture flow in cement-based materials. In the first contribution, electrically-based methods are developed to visualize highly-transient moisture ow in damaged and undamaged material. The electrically-based methods are shown to substantially improve upon the small-size limitations of standard visualization techniques (X-ray, gamma-ray, and neutron imaging). Moreover, the visualizations are shown to have adequate resolution to accurately depict variable saturation.
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The second contribution of the thesis is the development of material models and numerical simulation techniques for moisture ow in cement-based materials with distributed damage. In this effort, two simulation methods are used: one that considers moisture ow by homogenizing transport properties of the unsaturated/damaged material under hysteresis and another that considers transient unsaturated ow between fracture and undamaged material phases (dual-permeability). The results show that both methods model unsaturated ow in damaged cement-based material well, however dual-permeability model better simulated ow at late stages of ingress.
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http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10708404
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