Effects of corrosion on a steel bowstring bridge in marine environment: A case-study of assessment and retrofit

2021 ◽  
Vol 16 (4) ◽  
pp. 121-137
Author(s):  
Michele Fabio Granata
Keyword(s):  
Corrosion Protection ◽  
Marine Environment ◽  
Spray Coating ◽  
Thermal Spray Coating ◽  
In Situ Tests ◽  
Limit States ◽  
Intervention Measures ◽  
Near Future

The case-study of a steel bowstring bridge set in a marine environment and highly damaged by corrosion is presented. The bridge was built in 2004 and was repainted for corrosion protection in 2010. Despite the recent construction and the maintenance interventions, many structural elements like hangers are highly damaged by corrosion with decreasing performance in terms of serviceability and ultimate limit states. A deep investigation was carried out in order to assess the bridge and to establish the necessary retrofit actions to be carried out in the near future. In-situ tests reveal the reduced performance of the original steel in terms of strength and corrosion protection, together with the inefficiency of the successive maintenance interventions. The paper presents assessment of the bridge and retrofit measures, including replacement of the hangers and galvanization through thermal spray coating technology, in order to increase its service life. The results of the investigations and the intervention measures are outlined and discussed.

Thermal Spray for Corrosion Control: A Competitive Edge for Commercial Shipbuilding

1995 ◽  
Vol 11 (01) ◽  
pp. 53-55
Author(s):  
Frank S. Rogers
Keyword(s):  
Thermal Spray ◽  
Marine Environment ◽  
Thermal Spraying ◽  
Spray Coating ◽  
Cost Effective ◽  
Thermal Spray Coating ◽  
Coating System ◽  
Protection Mechanism ◽  
Arc Spray ◽  
Spray System

Thermal spraying of steel with aluminum to protect it from corrosion is a technology that has been proven to work in the marine environment. The thermal spray coating system includes a paint sealer that is applied over the thermally sprayed aluminum; this extends the service life of the coating, and provides color to the end product. The thermal spray system protects steel both through the principle of isolation (as in painting) and galvanization (as in galvanizing). With this dual protection mechanism, steel is protected from corrosion even when the coating is damaged. The thermal sprayed aluminum coating system has proven to be the most cost-effective corrosion protection system for the marine environment. Until recently, however, the initial cost of application has limited its use for general application. Today a new arc spray technology has reduced the application cost of thermal spraying aluminum to below that of painting. Commercial shipbuilders could use this technology to enhance their market position in the marine industry.

International and National Thermal Spray Standards Program with Comment on Those for the Corrosion Protection of Steel and Reinforced Concrete

1996 ◽  
Author(s):  
R.A. Sulit
Keyword(s):  
Reinforced Concrete ◽  
Corrosion Protection ◽  
Thermal Spray ◽  
Thermal Spraying ◽  
Spray Coating ◽  
Thermal Spray Coating ◽  
Test Methods ◽  
Current Status ◽  
Work Program ◽  
Society Committee

Abstract A review of selected national and international thermal spraying guides and specifications for the preservation of steel and reinforced concrete using thermal spray coating of aluminum, zinc and their alloys is presented. The work program and current status of the US national organizations contributing to and developing test methods and process standards are summarized along with those of ISOATC 107/SC 5. The Secretariat of the ISO/TC 107/SC 5, Thermal Spraying was transferred from AFNOR, France, to ANSI, US, in June 1995. ANSI, in turn, designated AWS to be its delegate in thermal spray matters. The work program of the newly formed SSPC/NACE/AWS Tri-Society Committee on thermal spray coatings for the corrosion protection of steel is summarized.

An Assessment of Thermal Spray Coating Technologies for High Temperature Corrosion Protection

1997 ◽  
Vol 251-254 ◽  
pp. 809-816 ◽  
Author(s):  
G.R. Heath ◽  
P. Heimgartner ◽  
G. Irons ◽  
Robert D. Miller ◽  
Stefan Gustafsson
Keyword(s):  
High Temperature ◽  
Corrosion Protection ◽  
Thermal Spray ◽  
Spray Coating ◽  
Thermal Spray Coating ◽  
High Temperature Corrosion

In-Process Damage Monitoring and Stress Analysis of Thermal Spray Coating

2007 ◽  
Vol 353-358 ◽  
pp. 2403-2406
Author(s):  
Koichi Taniguchi ◽  
Manabu Enoki ◽  
Koichi Tomita
Keyword(s):  
Thermal Spray ◽  
Laser Interferometer ◽  
Spray Coating ◽  
Thermal Spray Coating ◽  
In Situ Monitoring ◽  
Spray Coatings ◽  
Damage Monitoring ◽  
Process Damage ◽  
Ae Signals

AE method is a well-known technique for in-situ monitoring of damage behavior by attached piezoelectric transducer. However, this conventional detection of AE signals has certain limitations. In recent years, numerous efforts have addressed the substitution of laser-based techniques for ultrasonic nondestructive evaluation in place of conventional piezoelectric transducers. Especially, a laser interferometer can be used to measure a displacement or velocity at materials surface using Doppler-shift. However, there are few reports referring to the detection of AE signals in the practical materials and testing because of the difficulty of experiments. We developed the AE measurement system with laser interferometer to apply this technique to microcrack evaluation and reported the quantitative AE analysis in various materials. This paper demonstrates AE results from thermal spray coatings at elevated temperature.

Damage Assessment of Cultural Heritage Structures after the 2015 Gorkha, Nepal, Earthquake: A Case Study of Jagannath Temple

2017 ◽  
Vol 33 (1_suppl) ◽  
pp. 363-376 ◽  
Author(s):  
Sujan Shrestha ◽  
Bipin Shrestha ◽  
Manjip Shakya ◽  
Prem Nath Maskey
Keyword(s):  
Damage Assessment ◽  
Ambient Vibration ◽  
Kathmandu Valley ◽  
In Situ Tests ◽  
World Heritage Sites ◽  
Heritage Sites ◽  
Nepal Earthquake ◽  
Observed Damage

The Gorkha, Nepal, earthquake and the series of aftershocks that followed have damaged many heritage structures in and around Kathmandu Valley, including UNESCO World Heritage Sites (WHSs). This paper summarizes observed damage to the heritage structures of diverse typologies within the UNESCO WHSs of Kathmandu Valley. As a part of the investigation, inspection survey and damage assessment were carried out for Jagannath Temple, one of the partially damaged monuments in the Kathmandu Durbar Square WHS. Ambient vibration and in-situ tests using the pendulum hammer, the rebound hammer, and in-place push on masonry walls were performed. Finite-element models of the structure were developed, and the results were analyzed and compared with field observations. Based on the observed damages and the results obtained from numerical modeling, the primary causes of the damage are discussed.

scholarly journals Weatherability of Arc Thermal Spray Al-Mg Coating in a Simulated Marine Environment

2020 ◽  
Author(s):  
Atsushi NAKANO
Keyword(s):  
Thermal Spray ◽  
Marine Environment ◽  
Spray Coating ◽  
Thermal Spray Coating ◽  
Artificial Seawater ◽  
Anticorrosion Property ◽  
Exposure Test ◽  
Atmospheric Exposure ◽  
One Year ◽  
The One

Anticorrosion property of Al-5mass%Mg sprayed coating was evaluated by an atmospheric exposure test simulating marine environment for one-year. The test simulating marine environment means an accelerated exposure test where artificial seawater is sprayed on the coating surface in a general atmospheric exposure test. When the initial film thickness is small, the thickness of Al-Mg thermal spray coating decreased. For both exposure tests for one-year, the corrosion products of Al-Mg thermal spray could not be identified. From the results of EPMA, after the one-year atmospheric exposure test, Cl originating from airborne salts in atmosphere or from sprayed artificial seawater was not observed in the surface or inside of the Al-Mg coating. The spontaneous potential of Al-Mg thermal spray coating shifted to the noble side from that of the initial material after the one-year atmospheric exposure test. The anode polarization exhibited the same behavior in the two kinds of atmospheric exposure tests.

Case Study: Application of HVOF Sprayed Coatings for Replacement of Chrome Plating On Navy P-3 Aircraft Hydraulic Components and Landing Gear

1998 ◽  
Author(s):  
D.S. Parker
Keyword(s):  
Spray Coating ◽  
Personal Exposure ◽  
Thermal Spray Coating ◽  
Landing Gear ◽  
Wear Testing ◽  
Chrome Plating ◽  
Exposure Limit ◽  
Hexavalent Chrome ◽  
Cobalt Coating

Abstract Environmental constraints on exposure to hexavalent chrome and its compounds has prompted increased utilization of HVOF thermal spray coating technology to implement new overhaul repairs for components that are currently chrome plated. Proposed 1998 EPA and OSHA standards place very tight restrictions on the Personal Exposure Limit (PEL) for hexavalent chrome, which will impact chrome plating operations and most likely attendant grinding operations. Historically, HVOF or D-gun type repairs involved bearing bores, journals on main shafts, mid span supports, dimensional restorations and clearance control applications predominantly on gas turbine engines. Currently, the Naval Aviation Depot Jacksonville is further developing HVOF capabilities for repairing all P-3 aircraft hydraulic component piston rods, landing gear piston struts, and landing gear axle journals with a tungsten carbide 17% cobalt coating in lieu of chrome plating. Once implemented, the repair technology will be transferred to other Naval aircraft components beginning with F14, F/A-18, EA-6B, E-6, and will eventually reduce personnel exposure to chrome and reduce environmental disposal costs for chrome plating waste by two-thirds. This paper provides a case study of the development and implementation of a chrome plating replacement for the P-3 aircraft including fatigue, corrosion, and seal wear testing, as well as HVOF parameter optimization development.

scholarly journals In situ tests for water quality assessment: a case study in Pampean rivers

2002 ◽  
Vol 36 (16) ◽  
pp. 4033-4040 ◽  
Author(s):  
Manuel A.S Graça ◽  
Alberto Rodrı́gues-Capı́tulo ◽  
Carolina Ocón ◽  
Nora Gómez
Keyword(s):  
Water Quality ◽  
Quality Assessment ◽  
Water Quality Assessment ◽  
In Situ Tests

scholarly journals Assessment and Rehabilitation of Culturally Protected Prince Rudolf Infantry Barracks in Zagreb after Major Earthquake

Buildings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 508
Author(s):  
Mija Milić ◽  
Mislav Stepinac ◽  
Luka Lulić ◽  
Nataša Ivanišević ◽  
Ivan Matorić ◽  
...  
Keyword(s):  
Seismic Analysis ◽  
Human Life ◽  
Historical Background ◽  
Cultural Significance ◽  
In Situ Tests ◽  
Reliable Assessment ◽  
Heritage Protection ◽  
Observed Damage

Recently, Zagreb was struck by a strong earthquake. Damage throughout the city was tremendous due to numerous aged and vulnerable masonry buildings. Many damaged buildings are under a certain level of cultural heritage protection. Hence, reliable assessment and effective rehabilitation are important to preserve cultural significance and mitigate risk for human life. With that in mind, the procedure of a detailed condition assessment of the building under heritage protection is presented. A detailed historical background of the case study building is shown, and observed damage and conducted in situ tests are discussed. The nonlinear static seismic analysis performed in the 3Muri software is extensively elaborated. Four different levels of reconstruction according to new Croatian law are briefly presented. Additionally, several strengthening scenarios are proposed with various strengthening techniques.

scholarly journals In Situ Tests—Predicted vs. Observed Settlements: A Comparative Case Study

2014 ◽  
Vol 8 (7) ◽  
Author(s):  
Neritan Shkodrani ◽  
Ergys Anamali ◽  
Luisa Dhimitri ◽  
Shpresa Gashi
Keyword(s):  
Comparative Case Study ◽  
In Situ Tests
Sign in / Sign up

Export Citation Format

Share Document