Concrete Products

MAR 2016

Concrete Products covers the issues that attract producers of ready mixed and manufactured concrete focusing on equipment and material technology, market development and management topics.

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54 • March 2016 TECHNICAL TALK BY TOM KUENNEN For years, the classic precast Jersey-shape temporary concrete barrier (TCB) was the stan- dard for reliable work zone worker protection, but the newer F-shape is a refinement of the Jersey TCB that further limits vehicle damage, as its lower-sloped face better redirects vehi- cles under low-impact conditions. "Temporary barriers are segmented units which are attached end-to-end by a load-bear- ing connection," say Robert W. Bielenberg, M.S.M.E., Ronald K. Faller, Ph.D., P.E., Jenni- fer D. Schmidt, Ph.D., P.E., and John D. Reid, Ph.D. Midwest Roadside Safety Facility, Uni- versity of Nebraska-Lincoln; and Erik Emerson, P.E., Wisconsin Department of Transportation, in their 2016 technical paper, Development of a Retrofit, Low Deflection Temporary Concrete Barrier System. "They are designed to protect equipment and workers in the work zone, to prevent errant vehicles from leaving the traveled way, and to safely redirect those vehicles impacting the barrier," the authors write. "Often, temporary barriers are used in appli- cations where it is desired that their deflec- tion during vehicular impacts be limited. During bridge construction, temporary bar- riers are often placed adjacent to the edge of a bridge deck in order to provide adequate lane width. Freestanding temporary barriers used in these types of installations pose a potential safety hazard to errant vehicles as there is a risk for the barrier segments to be propelled off of the bridge." F-SHAPE TEMP BARRIERS GET RETROFIT STIFFENING Low-defection F-shape barrier retroft system test was composed of 16 12.5-ft.- long F-shaped temporary concrete barriers installed with the back of the barrier seg- ments offset 24 inches from a simulated bridge deck edge. PHOTOS: Bielenberg, Schmidt, Faller, Reid and Emerson 1 800 632 7083 Dealers throughout U.S. and Canada European self- propelled washout heads give full mixer coverage. High pressure, high volume, blasts buildup away Powerful hand gun cleans chutes and belts End of shift, end of day or inter- batch wash "Incredible performance, we are saving ½ hour every day" Buzz Morgan, Lindsay Precast. Empower your crew – Get full information and videos; visit Precast Show, Booth 1032

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