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This coupler replaces conventional hooked reinforcing bar also simplifies reinforcing bar placement and lowers placing costs . Head area of
this coupler exceeds 5 times bar area (net force bearing area is 4x) according to the cone shape shearing theory so using of this coupler reduces
the Ldt (embedment length of the rebar) couplers meet requirements of ACI318-08 section 12.6.
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