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Title: Use of epoxy or polyester resin concrete in tensile zone of composite concrete beams
Authors: United States. Assistant Secretary of the Army (R & D).
Geymayer, H. G.
Keywords: Beams (supports)
Concrete beams
Concrete testing
Epoxy resins
High-strength concretes
Polyester resins
Publisher: Concrete Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; C-69-4.
Description: Technical report
Abstract: This report describes the results of an investigation into the feasibility of combining the high compressive strength of portland cement concrete and the superior tensile strength of epoxy or polyester resin concrete into a composite beam. This would increase the beam's flexural strength and improve the corrosion protection for the reinforcement at large deflections by eliminating tensile cracks. The report describes in detail the development of high-strength resin concrete mixtures and summarizes the most important engineering properties of the selected mixtures. Also included are the results of third-point loading tests of 12 reinforced and unreinforced composite beams with 1-1/2- and 3-in.-thick layers of epoxy and polyester resin concretes. These results are compared; with results or tests of two reference beams without resin concrete layers and with analytical results. The study led to the following principal conclusions: a. Properly designed-resin concrete layers at the tension face of concrete beams can be used to moderately increase the strength and rigidity of reinforced concrete beams, or to upgrade the flexural strength of unreinforced beams by a factor of two to three. b. More important than their influence on strength is the ability of resin concrete layers to provide a noncracking moisture barrier or corrosion protection practically up to beam failure. c. The epoxy resins appeared to be more suitable for this application than the polyester resins investigated due to lower shrinkage and exotherm as well as higher tensile strength and tensile strain capacity. d. In proportioning resin concrete mixtures, early attention should be directed to properties other than strength (such as shrinkage, exotherms, coefficient of thermal expansion, creep, sensitivity to environmental factors, etc.)
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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