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Articles 61 - 70 of 70
Full-Text Articles in Civil Engineering
The Structural Reliability Of Bridges Subject To Time-Dependent Deterioration, Colin C. Caprani, C. Mcnally, E. J. O'Brien, A. Bordallo-Ruiz
The Structural Reliability Of Bridges Subject To Time-Dependent Deterioration, Colin C. Caprani, C. Mcnally, E. J. O'Brien, A. Bordallo-Ruiz
Conference papers
The reliability of the structural performance of any given structure is affected by both in-service loading and material deterioration due to environmental attack. They must be evaluated at any given time in order to compute lifetime probability of failure. This paper presents an innovative methodology to derive the structure lifetime load effect due to existing traffic using a statistical tool known as Predictive Likelihood. Loss of resistance due to corrosion originated by chloride ingression is also taken into account. Finally the lifetime probability of failure is evaluated via the application of a time-discretization strategy.
T.O.C.S. : Hydrogen Sulfide Remission System, Purdue Ect Team
T.O.C.S. : Hydrogen Sulfide Remission System, Purdue Ect Team
ECT Fact Sheets Archive
BioEnviroTech, Inc., (BET) developed Toxicity Odor Corrosion Sulfides (T.O.C.S.) Remission System for hydrogen sulfide reduction in municipal and industrial wastewater sewer, lift stations and force mains. This safe and cost effective biotreatment technology uses safe and natural bacteria to interrupt sulfide generation.
Mmfx Microcomposite Steel (Mmfx2), Purdue Ect Team
Mmfx Microcomposite Steel (Mmfx2), Purdue Ect Team
ECT Fact Sheets Archive
One of the major problems facing the construction industry today is the effect of corrosion on steel, and the inherent structural weaknesses it causes in highways, bridges and buildings. MMFX 2 rebar was developed through the use of nanotechnology by Dr. Gareth Thomas, graduate school professor of materials science at Univ. of California, Berkeley. It is highly corrosion resistant and equal, or in many cases, far superior to existing conventional carbon steel in its properties of strength, energy absorption, toughness, brittleness, ductility, and formability.
Cyonyx - Advanced Performance Pipe, Purdue Ect Team
Cyonyx - Advanced Performance Pipe, Purdue Ect Team
ECT Fact Sheets Archive
A highly corrosion-resistant composite pipe able to withstand impact in high-traffic areas. While some lined steel and metal alloy pipe are capable of withstanding critical fluids and providing necessary impact resistance, the cost, weight, and limited life expectancy are prohibitive. CYONYX pipe is derived from a new technology that imparts extremely high corrosion resistance, impact resistance approaching that of steel, low material and installation costs, and life expectancy exceeding lined steel and metal alloys.
Chemical Cleaning Process For Porable Water Distrubution Pipe Systems, Purdue Ect Team
Chemical Cleaning Process For Porable Water Distrubution Pipe Systems, Purdue Ect Team
ECT Fact Sheets Archive
Aging potable water distribution pipe systems are becoming a major concern throughout the world. Deterioration of water quality and service as a result of micro biological tuberculation and corrosion continues to increase. Major costs for replacement or rehabilitation of distribution systems are being faced by most communities. The chemical cleaning solution is an organic oxide scavenger which is mixed with a predetermined quantity of muriatic acid and circulated through an isolated section of the water main.
Performance-Related Specifications For Concrete Bridge Superstructures, Volume 4: Bond Of Epoxy-Coated Bars With Thicker Coatings, J. A. Ramirez, Michael K. Appelhans
Performance-Related Specifications For Concrete Bridge Superstructures, Volume 4: Bond Of Epoxy-Coated Bars With Thicker Coatings, J. A. Ramirez, Michael K. Appelhans
JTRP Technical Reports
In Volume 4 of the final report, the results of an evaluation of the bond performance of epoxy-coated bars with a coating thickness up to 18 mils are presented. The experimental work on the bond performance of epoxy-coated bars with thickness up to 18 mils indicates that the current AASHTO requirements for development length of epoxy-coated bars up to #8 could be safely extended to coating thickness of up to 18 mils. Thus, no change to the bond specifications is recommended in order to implement the use of bars with diameters up to a #8 with epoxy-coating thickness up to …
Performance-Related Specifications For Concrete Bridge Superstructures, Volume 3: Nonmetallic Reinforcement, Robert J. Frosch, Christopher P. Mosley, Ahmet Koray Tureyen
Performance-Related Specifications For Concrete Bridge Superstructures, Volume 3: Nonmetallic Reinforcement, Robert J. Frosch, Christopher P. Mosley, Ahmet Koray Tureyen
JTRP Technical Reports
In Volume 3 of the final report, research work conducted to investigate the behavior of fiber reinforced polymer (FRP) reinforcement is summarized. This study focused on the behavior of FRP reinforced concrete structures with an emphasis on bond and shear. For the bond investigation, three series of beam splice tests were performed on specimens reinforced with steel, glass FRP, and aramid FRP to determine the effect of the different types of reinforcement on bond, cracking, and deflections. The test results indicate that the use of FRP reinforcement leads to lower bond strengths and, therefore, require longer development lengths. The specimen …
Performance-Related Specifications For Concrete Bridge Superstructures, Volume 1: Performance Parameters And Related Procedure For Concrete Bridge Superstructures, J. A. Ramirez, Jhon Paul Smith
Performance-Related Specifications For Concrete Bridge Superstructures, Volume 1: Performance Parameters And Related Procedure For Concrete Bridge Superstructures, J. A. Ramirez, Jhon Paul Smith
JTRP Technical Reports
In Volume 1 of the final report, the identification of performance levels and parameters, and the development of acceptance criteria, have been addressed. Emphasis has been placed on the development of a methodology for a Performance Related Specification, PRS, for concrete bridge superstructures. The implementation of the methodology, presented in the form of a user-friendly computer program, is project specific. It requires the mean and standard deviation (or definition of a probability distribution) of the input parameters for the performance predictive models. This is done for both the as-designed condition and the as-built condition of the structure. The contractor is …
Development And Evaluation Of Cement-Based Materials For Repair Of Corrosion-Damaged Reinforced Concrete Slabs, Rongtang Liu, J. Olek
Development And Evaluation Of Cement-Based Materials For Repair Of Corrosion-Damaged Reinforced Concrete Slabs, Rongtang Liu, J. Olek
JTRP Technical Reports
In this study, the results of an extensive laboratory investigation conducted to evaluate the properties of concrete mixes used as patching materials to repair reinforced concrete slabs damaged by corrosion are reported. Seven special concrete mixes containing various combinations of chemical or mineral admixtures were developed and used as a patching material to improve the durability of the repaired slabs. Physical and mechanical properties of these mixes, such as compressive strength, static modulus of elasticity, dynamic modulus of elasticity, and shrinkage were evaluated. Durability-related parameters investigated included resistance of concrete to penetration of chloride ions and freeze-thaw resistance. The results …
Methods Of Corrosion Protection And Durability Of Concrete Bridge Decks Reinforced With Epoxy-Coated Bars - Phase I, Lisa Michele Samples, J. A. Ramirez
Methods Of Corrosion Protection And Durability Of Concrete Bridge Decks Reinforced With Epoxy-Coated Bars - Phase I, Lisa Michele Samples, J. A. Ramirez
JTRP Technical Reports
In this study, the results of an extensive field and laboratory investigation conducted to evaluate the corrosion performance of epoxy-coated reinforcement are reported. One hundred and twenty three concrete bridge decks containing epoxy-coated reinforcement, uncoated reinforcement, and various other corrosion protection systems were included in a field investigation. An initial visual inspection of these bridge decks showed that 44% had signs of distress from corrosion of the reinforcement. Six decks, representing 5% of the total sample, were selected for a second more detailed survey. Three of the six decks had epoxy-coated reinforcement. This number represents 11% of the total sample …