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This paper presented the polyurea protective project of Beijing-Shanghai High Speed Railway. It also reviewed the polyurea history in China, introduced research and development of polyurea in Qingdao Technological University. The analysis and discussion on the application problems exposed in the Beijing-Shanghai High Speed Railway project were performed in this paper.
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A bridge coatings specification can be a complex and sometimes confusing document to navigate through. Yet it is regarded as the rulebook for quality control and quality assurance personnel responsible for inspecting the quality of work. An inspection plan is a tool that can make the process of understanding the inspection checkpoints invoked by a bridge coating specification more streamlined and can be a key communication tool for contractor and inspection personnel.
The nuclear renaissance that is emerging in the United States will be based on new power plant designs from a variety of US and international sources. While the new plant designs will be based on the time tested and proven concepts of both the boiling water reactor (BWR) and the pressurized water reactor (PWR), the emphasis of the new plants will be on engineering designs that incorporate increased levels of redundancy in safety systems, and post-LOCA passive systems to move fluids about the reactor containment, thereby providing for long-term core cooling and decay heat removal, The new plant designs will include a strong emphasis on modular, off-site construction where more protective coatings will be applied in the fabrication shop.
Coating technologies for bridges has not changed much since 1977. Available finish coat technologies were limited to alkyd, acrylic, or urethane-based chemistry. Performance of these chemistries has declined over the years due to cost reduction in paint to meet project pricing requirements. Bridge owners and engineers have had a limited selection of high-performance coatings to protect their assets. This is even more important with high profile structures where the finish coat needs to stand the test of time and limited maintenance funding has forced asset owners to extend time in between cosmetic maintenance
This paper takes a look at emerging environmental, health and safety issues that may impact painting contactors and facility owners. Specific topics include a summary of OSHA and EPA’s new and proposed revised regulations related to lead, paint, and construction. Information will be provided on EPA regulatory actions related to NAAQS Lead and the recent advanced notice of proposed rulemaking for Lead, Renovation, Repair, and Painting Program for Public and Commercial Buildings.
Reinforced concrete structures are subject to many types of deterioration. Many of these are visible; however, one that is not is the crevice corrosion that occurs internally at the reinforcing bars. To detect, mitigate and delay this type of insidious corrosion, a form of cathodic protection in the form of thermal sprayed coatings will be discussed. To implement this as a corrective action as well as a preventive action is the theme of this paper.
Pre-construction Primer (PCP) is a zinc-containing, weld-through primer applied at low thickness to minimize rusting of steel during storage and fabrication. PCP removal is perceived to reduce risk of coating failure associated with painting over an aged zinc primer. PCP is retained in many commercial shipbuilding operations in order to reduce costs and provide a better performing coating system. This paper will review commercial industry practices and the guidance provided by marine coating manufacturers.
By following the ACE strategy, you can identify the critical elements of an effective fall protection safety plan.
Truly self-healing materials have the capability to repair themselves when they are damaged without the need for any external intervention. Self-healing systems based on microencapsulated healing agents developed by researchers at the University of Illinois at Urbana-Champaign were initially developed with polymerized resins and reinforced polymer composites as the intended applications. In this paper, we discuss the principles that emerged in the design of these self-healing systems and how they are presently used in design and optimization of self-healing systems for industrial and marine protective coatings.
This paper will focus on the advancement of waterborne acrylic coatings that features self-stratifying technology which significantly advances performance of color and gloss retention. Various analytical methods were used to verify stratification. Magnified cross sections of the coating film will show the layered effect and discussion of how these multiple micro-paint layers outperform standard acrylics. An overview of performance testing will be presented to demonstrate the value of this technology and how it contributes to longer lifecycle costs and lower overall project costs.
Over the last few decades, people in the field of management have been involved in a search for the “best” style of leadership. Yet, the evidence from research clearly indicated that there is no single app-purpose leadership style. Successful leaders are those who can adapt their behavior to meet the demands of their unique situation.
The Southern Nevada Water Authority (SNWA) is a regional agency whose mission is to manage water resources and develop solutions that will ensure adequate future water supplies for the Las Vegas Valley. Its primary water resource is the Colorado River via Lake Mead. Since 2000, persistent droughts have resulted in decreasing Lake Mead water levels. To reduce Southern Nevada’s reliance on the Colorado River, SNWA has begun planning for the development of in-state groundwater resources north of Las Vegas. Initial planning efforts identified project specific requirements that could potentially justify the use of polyurethane lining systems in lieu of traditional cement mortar lining for over 200 miles of large diameter water transmission pipeline.