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FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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The multilayer tube, including external concrete shell connected by adhesive with the inner core of cast stone is distinguished by the fact that to increase the strength, and the core is made with longitudinal prestressed reinforcement placed uniformly along its outer surface and fastened to supports for example, metallic mounted on its end, and also to a spiral reinforcement. The core is made of separate cast stone elements joined to each other by polymeric adhesive.
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