non-metallic post-tensioning construction components, namely, duct couplers for connecting two segments of sheath embedded inside a concrete structure which sheathing forms a void for installing and prestressing post-tensioning tendons after the concrete attains desired strength

'attain':39 'compon':8 'concret':21,38 'connect':13 'construct':7 'coupler':11 'desir':40 'duct':10 'embed':18 'form':25 'insid':19 'instal':29 'metal':3 'name':9 'non':2 'non-metal':1 'post':5,33 'post-tens':4,32 'prestress':31 'segment':15 'sheath':17,24 'strength':41 'structur':22 'tendon':35 'tension':6,34 'two':14 'void':27

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