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Latex modified fibrous concrete : experimental feature : final report.
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1985-03-01
[PDF-312.73 KB]
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Abstract:In November 1980, a contractor requested permission to use a 1.5 inch thick Latex Modified Fibrous Concrete (LMFC) overlay in lieu of a 2.5 inch low slump concrete (Iowa System) or a 2.5 inch unreinforced latex modified concrete. The overlays were to be on four bridge decks within the Sundail-Sandy River Section.
The Latex Modified Fibrous Concrete used consisted of approximately 85 lbs of steel fibers per cubic yard of 8 sack latex modified concrete. The 1 1/2 inch overlay thickness was permitted due to the reported greater flexural strength of latex modified concrete with fiber. The steel fibers used were Dramix ZP 50/.50.
Two positive items should be noted when rating the Latex Modified Fibrous Concrete: the cracking, delamination and spalling occurred only on the edges of the overlays near the overlay meet lines; the majority of each overlay remained intact and well bonded. Secondly, the large, frequent, transverse cracks which were prominent in the steel spans of both Sandy River bridges did not reflect through the overlay, even after 4 years in service.
However, because of the many problems encountered during construction, the less than desirable riding surface and the serious cracking, delamination and spalling along joints, the overall rating of the LMFC overlay system was poor, and it is NOT recommended for future use until the problems have been eliminated.
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