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Styrenated Unsaturated Polyester & Vinyl Ester coatings are accepted for use in chemical immersion tank linings. The primary advantage is the increased chemical resistance to harsh commodities and fast turnaround time compared to epoxy coatings. However, styrene is becoming heavily regulated due to its safety and health concerns.
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Back in 1991 the first offshore wind asset was constructed in Denmark near the coastline from Vindeby (which means windy city). This asset comprised 11 foundations with a capacity of 0.36 MW each. Since then; the offshore wind industry has been booming, and projects are becoming bigger and bigger in size (capacity), number of foundations per site and further and further offshore.
This paper examines the authors successful experiences on some simple and very complex projects where both the coatings and environmental requirements were limited to a few pages. Being made up almost entirely of SSPC/NACE and PDCA standards that described “performance criteria” as opposed to being a prescriptive or proprietary type of specification defining what was to be used, when it was to be used and how it was to be done.
This paper identifies the unique steps taken to safely remove lead-based paint from a major highway/commuter railroad bridge connecting Philadelphia, Pennsylvania with Camden, New Jersey, followed by the application of a new long lasting protective coating system. The paper addresses project phasing by the owner and coordination with the commuter train to keep costs down and to minimize inconvenience to the public.
Due to the regulations of toxic biocidal products in marine environments, the development of nontoxic antifouling (AF) coatings has become required. The development of nontoxic antifouling formulations implies the use of ingredients (such as: polymers, additives and pigments) that are devoid of toxicity towards marine environments. In this regard, erodible coatings, based on biodegradable polymer, are used to respond to this problem. Recently, polyurethane (PU) has been adopted into antifouling coating due to its ability to migrate the certain functional groups which resist the attachment of fouling. Biodegradation of PU can accelerate the erodible properties which ultimately improve the antifouling properties. In this study, a series of biodegradable PU coatings was formulated by tuning biodegradable polyol. The antifouling performance was evaluated after certain intervals.
Self-polishing coatings (SPC) are widely being used in marine structures to protect metals from fouling. After restrictions on using toxic metals, coating industry are seeking environmentally-friendly SPC coatings that maintain their performance over extended periods. Unfortunately, most of the commercial SPC coatings contain different toxic materials, besides their performance is inadequate to prevent fouling under adverse conditions. The main mechanism of SPC coating is to facilitate the continuous renewal of the surface and the release of active compound via a hydrolysis reaction or an ion exchange reaction with seawater. In this study, polyurethane (PU) SPC coatings were synthesized by in-situ polymerization using biodegradable polyol. The polishing rate of coating was determined from the reduction in dry film thickness after artificial seawater immersion under a dynamic condition. The fouling resistance of coatings was considered after certain interval.
As an island nation, Japan is particularly dependent on the good health of its bridges to connect its different regions for commercial activities. In order to reduce maintenance cost and downtime for bridges, Japanese road authorities have looked to the use of longer lasting premium materials of construction.
The Minnesota Department of Transportation (MnDOT) with KTA-Tator, Inc. (KTA) conducted a one-day seminar on Bridge Maintenance Painting Strategy & Project Design in May 2013. One outcome of that seminar was the realization that MnDOT needed a more uniform method to rate the condition of coatings statewide during the biennial bridge safety inspections and a process to select and prioritize maintenance painting strategies. MnDOT assembled a Technical Advisory Panel to address these needs and launched a multi-objective study from October 2013 through June 2014.
The Brooklyn Bridge is a daily transportation lifeline for more than 200,000 people. It is one of the oldest and most recognizable bridges in the US and was the longest suspension bridge in the world when it opened in 1883. The Bridge has been designated both a National and New York City Landmark.
Published percent volume solids data have been used for years by painting contractors,vcoating manufacturers, and inspectors to calculate the target wet film thickness to apply.
The construction of a major project such as a bridge can often provide significant challenges to say the least. These challenges are not always within the physical building or logistics of the bridge but often can be material related. One such challenge can be the curing of the materials on the project. To that end, Cianbro/Middlesex, a large industrial contractor, knew that they would need temporary climate control to meet the tight specifications for concrete curing during a construction project for the new Pearl Harbor Memorial Bridge in New Haven, Conn.
It is safe to say that water towers have become a predominant location for the placement of cellular telecommunications equipment. Their height and design style make them a “natural” consideration for what the industry calls them, macro sites. And when one carrier locates on a tower you can be sure that others will soon follow.