Performance of epoxy-injected concrete in hot weather conditions

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" Performance of epoxy-injected concrete in hot weather conditions "
H. S. E. Khalil

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	1112487
Doc. No	:	TLpq303791672
Main Entry	:	H. S. E. Khalil
Title & Author	:	Performance of epoxy-injected concrete in hot weather conditions\ H. S. E. Khalil
College	:	King Fahd University of Petroleum and Minerals (Saudi Arabia)
Date	:	1989
student score	:	1989
Degree	:	M.Sc.
Page No	:	214
Abstract	:	Presently there is no data available on the field performance of such epoxy resins in the harsh environmental conditions of the Gulf region. 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 70C (158F), a heat-cool cycling program and a wet-dry cycling program, and then tested in compression. Similarly, concrete beams of dimensions 152.4 mm x 152.4 mm x 533.4mm (6 in x 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 tested in flexure. Results of this work showed that these environmental factors have a considerable detrimental 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. (Abstract shortened by UMI.)
Subject	:	Applied sciences
	:	Civil engineering
	:	Plastics
	:	Saudi Arabia