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wrr^itvi'v <br />h^’’i •» ■ <br />■f: <br />V’V ■ ^ <br />^:i <br />■!*., <br />tv:- <br />hv <br />- <br />f'-- <br />K*;;\?i W' V"fe- <br />i'r <br />■ii>5'.-- <br />f'-'. <br />' - . . <br />■- “iV ■ -. <br />>.vj ‘'-.. <br />,'i-.- i <br />*T‘ ;■ <br />V*'.• <br />i: <br />v"'-' <br />■ <br />V'--•As,. <br />■Vi <br />? -vt:L- <br />s:!"" <br />i‘ <br />' <br />Frederic G. Hunt, P.E. <br />Marina Consultant Specializing In Floating Docks <br />3RD NATIONAL FLOATING STRUCIDKES DESIGN (XNFEKQICE <br />June 22-25, 1992 <br />in <br />San Diego, California <br />for <br />University of Wisconsin <br />pirffATICH MATERIALS - TOEIR PAST, PRESENT AND FUTURE <br />structures. So let’s review what has been used, wnat is being used and how to <br />design flotation for the life cycle of the designers choice. <br />Hhm 1 first became involved with flotation in the 1960s flotation consisted <br />SSly of”^nrgallon steel drums, and exposed polystyrene blocks. <br />In the 1970s the steel druns installed in the 1960s were <br />and sinking, and exposed foam flotation was eroding away, <br />lISciS^uSLg in the middle 1970s advanc«j«nt in the develop^t ot <br />iiTproved flotation had been made to protect the flotation natenals, a <br />polystyrene, fron the effects of water absorption and erosion. <br />Air became better "encased with total protection by h^vier stwl shells, both <br />round and rectangular, plastic 55 gallon druns and plastic tubs. <br />Polystyrene blocks were painted, coated, wrapped with fiterglas^ draped in <br />t5^ in steel S aluninun, set in concrete and cover^ with w^. <br />also being expanded into cylinders and tubs of steel, <br />aluninun, polyethylene and other plastics. <br />TWO part ndxe. of polyvirethan* *“»” bei®9for flotation and axtrudad polystyrene billets were becamng pop <br />•Lr^’sr„ss:, HI <br />s^iil e^pnent designed to control ndx quality and proportions. <br />T’ fl^tiS’c?~S’£Sr« S^er^^rr^ltil ™'rps ot <br />^ jurisdiction requrrxn, all <br />1790 Merriweathcr Dr. • Columbus. Ohio 43221-1327 • 614-451-5113 <br />v-« .