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Cementitious repair mortars are commonly used to rehabilitate deteriorated wastewater concrete infrastructure prior to the application of high-performance lining systems. Commonly such repair mortars receive a broom finish creating a “profiled” surface prior to the application of a spray applied protective lining system. Other recommendations require that that the cementitious mortars receive a blasted (mechanically profiled) surface to impart a mechanical profile prior to top coating with a similar lining system. In the following paper the authors summarize the results of an investigation to quantitatively assess adhesion of a protective lining when applied to a broom finish surface verses a blasted surface.
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The current National Ambient Air Quality Standards (40 CFR parts 50, 51, 53 and 58) for lead were published in 1978 to protect the public from the adverse health effects caused by lead. On May 20, 2008 the EPA published proposed changes to the NAAQS for lead; the final rule was published on October 15, 2008. These changes will affect the ambient air monitoring protocols required on industrial painting projects. This paper will focus on the practicalities of obtaining valid data from TSP-lead air monitors.
The mechanical properties of polymeric coatings are often overlooked because researchers are not aware of how modern instrumentation can now aid them in understanding how a particular product may survive in service conditions. In many applications the two main considerations are aesthetics and durability, both of which can be directly related to the mechanical properties of the base material.
This paper will discuss various considerations that should be weighed when writing a specification to line a concrete tank, secondary containment or industrial floor.
While commercial painting is often thought to be less rigorous or less technical than industrial painting, the commercial painting industry has its own set of demands on a coating and is not without its share of coating problems. The authors experience demonstrates that there are commonalities in failures of coatings in commercial painting.
This presentation will focus on the performance and aesthetic issues encountered when painting masonry surfaces. Contractors will also learn how to cost-effectively add color and improve appearance and weather protection to masonry jobs. Objectives of the presentation are education on proper surface preparation, how to select an appropriate coating for a long-lasting finish and new coating technology.
Concrete is an inherently attractive building material. It expresses the natural appeal of stone by its mass and permanence. With the addition of natural looking color variations, concrete as stone, is even more realistic. Concrete stains are an excellent choice for producing colors often found in earth and rock. When combined with simple and creative application techniques, stains allow for truly unique concrete installations, which complement a variety of hardscape and flooring designs.
Successful coating and lining application on concrete substrates are contingent, in part, on the basic design and installation of the concrete itself. Protective coatings and linings are effected by the amount and movement of water in the concrete, the compressive and tensile strength of the concrete and the concrete's ability to resist cracking from internal and external forces. Through attention to sub-grade conditions, water cement ratios, aggregate grading and content, and finish and cure techniques, probability of successful coating and lining application can be greatly increased.
Successful repair material and coating applications are dependent on proper concrete surface preparation where different technologies and methods must be reviewed and characterized, as well as quality control methods used to increase the successful application of materials applied to existing concrete surfaces.
The EPA estimates it will cost $390 billion over the next 20 years to repair or replace the crumbling wastewater infrastructure. Replacing infrastructure is costly, and in light of current economic conditions and worldwide budget cuts, often impossible to do. Alternatively, the use of single coat, fast cure high performance epoxy linings to rehabilitate sewage pipelines instead of replacing them will save municipalities considerable money and time, making it not only possible but practical for municipalities to protect their local environments today from sewage leaks.
The Department of National Defence (DND) in Canada has implemented a revised maintenance program for aircraft weapon systems whose goal is to ensure that essential maintenance is accomplished and to assure the continued airworthiness of aeronautical products during in-service operation. The program especially affects legacy aircraft. A case study is being presented where an adhesion failure was detected during a scheduled inspection.
A new software system has been developed to allow a plan to be created for the inspection tasks associated with the coating processes for a steel structure. This system uses a coatings library to create the coating systems that are to be applied to various user-defined zones of the structure. These zones are identified on a schematic drawing of the structure and then the coating systems and inspection regimes that are required can be associated with these zones.