Performance of Epoxy-injected concrete in hot weather conditions

(1989) Performance of Epoxy-injected concrete in hot weather conditions. Masters thesis, King Fahd University of Petroleum and Minerals.


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This present study was made to address this issue by running an experimental program in the laboratory under simulated conditions to those of the actual environment. Concrete cylinders, each of 76.2 mm (3 in) diameter and 152.4 mm (6 in) height with a slant gap (simulated crack) of 30? angle from vertical and of 1.6 mm (1/16 in) thickness, were epoxy injected using three of the locally available commercial epoxy products. After curing they were exposed to three different environmental conditions, namely a high temperature condition of 70?-C (158?-F), a heat-cool cycling program and a wet-dry cycling program, and then tested in compression, where the bond between epoxy and concrete was subjected to combined compressive and shear stresses. Similarly, concrete beams of dimensions 152.4 mm x 152.4 mm x 533.4 mm (6 inx 6 in x 21 in) with a crack in the middle of each beam simulated by a pre-inserted notch of 1.6 mm (1/16 in) thickness running in the tension zone of the beam were epoxy injected with the same epoxy compounds, exposed to the high temperature condition and the heat-cool cycling program and then tested in flexure where the bond between epoxy and concrete was subjected to linear tensile stresses. Results of this work showed that these environmental factors have a considerable deterimental effect on the epoxy-concrete bond, and therefore, on the strength and durability of repaired concrete elements. The epoxy compounds used showed some variation in their performance under these conditions. The change in their properties at high temperatures, the large difference between their coefficients of thermal expansion and that of concrete and the difference in volume changes between these epoxies and concrete due to the moisture movement into and from the repaired concrete were the main causes of this degradation. Properly formulated epoxies to suit the conditions of the Gulf region should be used in the repair of structures in this region.

Item Type: Thesis (Masters)
Subjects: Civil Engineering
Department: College of Design and Built Environment > Civil and Environmental Engineering
Committee Advisor: Al-Mandil, M. Y.
Committee Members: Baluch, Mohammad H. and Azad, Abul Kalam
Depositing User: Mr. Admin Admin
Date Deposited: 22 Jun 2008 13:56
Last Modified: 01 Nov 2019 13:56