Title: Joint Sealing in Reclamation Canals
Author(s): Henry Johns
Publication: Journal Proceedings
Appears on pages(s): 14-18
Keywords: asphalts; canal linings; concretes; cracking (fracturing) ; epoxy resins; field tests; joint fillers; joint sealers; joints (iunctions) ; polyvinyl chloride; portland cements;rubber; seepage; silicon compounds; sulfides.
Reviews U. S. Bureau of Reclamation experience with sealing joints and cracks in concrete-lined canals. After several decades experience, two basic systems for sealing contraction joints, and two for sealing cracks have resulted. For crack sealing, seals formed of either a coal tar extended polfide rubber sealant or a glass cloth reinforced phalt mastic tape are used. For joint sealing, PVC plastic contraction-joint-forming waterstop inserted into fresh concrete or coal tar extended polysulfide sealant are used. The polysulfide may be machine extruded into fresh or hardened concrete or installed as a preformed strip in fresh concrete. The two joint sealing systems seem to be competitive in cost and at a price only somewhat higher than the old asphalt mastic which afforded only half the service life. The long-term cost for sealing with the new systems thus appears to have been reduced by at least 50 percent.