Coefficient of Linear Thermal Expansion of Epoxy Resin Mortars.
ARMY CONSTRUCTION ENGINEERING RESEARCH LAB CHAMPAIGN ILL
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This study has revealed that there is a significant difference in the coefficients of linear thermal expansion of the various epoxy resin mortar systems tested they are two-to-four times greater than the accepted value for portland cement concrete. As expected, the coefficient decreases with an increase in aggregate content for dry, unsaturated specimens. However, it appears that there is an optimum aggregate content for saturated specimens after which the coefficient increases as aggregate content is increased. Absorbed moisture increases the coefficient of thermal expansion therefore epoxy resin mortars and concretes should be designed to prevent absorption by selection of the proper aggregate-to-binder ratio and by placement techniques that will provide a dense impermeable patch. Maximum shrinkage is generally achieved within two months when curing occurs at 73 F and a relative humidity of 55. Pavement temperatures during and shortly after repair is made, may influence the amount of stresses that develop in the resin concrete due to curing. Author, modified-PL
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