By G. C. Mays, A. R. Hutchinson
Contemporary advances in adhesive know-how have resulted in a quick development within the use of adhesives in load-bearing joints in civil engineering purposes comparable to constructions and bridges. in lots of instances, using adhesives can turn out less difficult, less costly, improved, and tougher than conventional tools of becoming a member of. This publication presents for a whole and transparent creation to using adhesives to shape load-bearing joints in bridges, civil engineering and development buildings. the 1st a part of this booklet addresses the the most important components fascinated by the formation of a profitable adhesive joint, together with adhesive choice, floor coaching, joint layout, fabrication and security from the surroundings. the second one a part of the ebook describes the starting to be makes use of of adhesives to fix and enhance current constructions, as well as describing their use in new buildings and functions which are now being constructed for the long run. the relationship among the 2 elements of the ebook is introduced out anyplace attainable in order that the hyperlinks among idea and perform are emphasised. The booklet offers the reader the entire details required to totally make the most the commercial and technical merits of adhesives over traditional tools. expert civil and structural engineers in better schooling and will locate this ebook a useful resource of knowledge on a know-how of accelerating significance.
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Additional resources for Adhesives in Civil Engineering
2 Generic classification of adhesives Epoxy resins Epoxy resins have only been available commercially since the Second World War and are traditionally based upon the reaction of epichlorohydrin on bis-phenol A, to give a liquid compound of 33 Glycidyl group Ether bond C H 2 - CH - CH 2 - O Ether bond CH 3 I C Hydroxyl group Ether bond Ether bond OH CH 3 I O - CH 2 - CH - Glycidyl group CH 2 O - CH? - I CH - CH 2 CH3 CH 3 _ n Epoxy group Bisphenol "A" group Bisphenol "A" group Fig. 1. Chemical structure of DGEBA (Ref.
937-43. Plastics and Rubber Institute, Adhesives Group, Symposium on Adhesives and Sealants in Building and Construction, London, 22 February 1988. Structural Adhesives in Engineering (SAE) Conference, Bristol University: SAE I, July 1986: Proceedings from Mechanical Engineering Publications, Bury St Edmunds; SAE II, September 1989: Proceedings from Butterworth Scientific Conferences, Guildford. Skeist, I. (Ed), Handbook of Adhesives, Van Nostrand Reinhold Co. New York, 1990. C. (Ed), Developments in Adhesives - 1, Applied Science Publishers, London, 1977.
The ability of an adhesive to wet a substrate surface (and the contact angle formed between liquid and solid) is fundamental to obtaining adhesion (Chapter 3). It is feasible to measure such contact angles for a stationary drop of liquid on a solid surface but the high filler contents of many structural adhesives mean that spreading is controlled by viscous forces. Adhesives being applied towards the end of their usable life tend to lack wetting ability. Joint open time. - This starts when the adhesive has been applied to the parts to be joined and represents the time limit during which the joint should be closed, otherwise the strength of the bond may be reduced significantly.