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In the rectification process of reinforced concrete structures, one of the primary considerations made is the selection of concrete repair methodology and repair products. The suitability of concrete repair products is determined by the structure’s function, and some of the main technical aspects which are considered include compressive strength, bond strength, shrinkage and expansion, tensile strength, chemical resistance, and flow characteristics.
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This paper will focus on polymeric cementitious urethane floor systems that are applied in very harsh and demanding environments. We will outline the history, advantages and disadvantages of these systems, as well as some of the applications for which these systems are best suited. Finally, we will discuss how these systems are applied.
A unique project was completed in Mid-2014 at the Powerhouse #3, Turbine Unit #23 refurbishment, Grand Coulee Dam, located in Washington State. The project scope includes a complete overhaul of the turbine bearings, windings, and critical components. As part of the overall scope, the contractor was charged with the task of coating the entire draft tube surface with an epoxy gel. The Bureau of Reclamation, based in Denver, Colorado, had conducted a site survey which indicated severe wear lines, which result in cavitation and the accompanying backpressure on the exiting water outflow to the Columbia River.
The permeance of coatings applied to the walls of Single Wythe concrete masonry units (CMU) can affect the long-term performance of the coating system, especially after multiple repaints. This paper describes the results of a study to determine if the Atlas Cell Test (NACE TM0174/ASTM C868) can be modified to evaluate the performance of individual coating systems based upon permeance.
Moisture is a key component of concrete. It is critical to the curing and strengthening process of the product. It is however the use or misuse of this critical component that may cause expensive and unavoidable problems over the life of the floor
Moisture related problems for non-permeable flooring systems have plagued the construction industry for decades. Lower volatile organic compounds limitations and expedited construction schedules have increased the occurrences and awareness of the issue.
Most flooring materials require a dry sub-straight before they can be applied and many of the flooring manufacturers have added maximum floor moisture content for their warranties to maintained. Contractors responsible for getting a building turned over to the owner are often finding themselves making a choice between shot basting and sealing the floors or setting up a temporary climate control system.
Now that you as a specialty coating / lining contractor have joined the fast-growing technology of polyurea elastomeric coating & lining systems, what’s the next step? The polyurea technology has grown in use by significant volumes since the initial start in the early 1990’s. Applications include concrete coatings / linings, steel coatings, traffic deck systems and specialty coatings.