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Grout Prism Steel Retainers are used to align and support the neoprene Grout Capping Compression Pads and the test specimen. They are made of steel plated to prevent rust and machined plane within 0.002in. Retainers are the size designed for specimens yielded from the “pinwheel” method of forming prism samples. A retainer holding a Grout Capping Compression Pad is placed at each end of the rectangular sample.
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