Title: Mid to Long Term Performance of Field Molded Sealants for Repairing Concrete Joints in Hydraulic Structures
Author(s): Johangar Mirza
Publication: Symposium Paper
Appears on pages(s): 1231-1258
Keywords: Cold weather construction; concretes; dams; hydraulic structures; joints (junctions); joint sealers; polyurethane resins; silicone resins.
This four-year project was carried out in an aim to conduct a mid- to long-term, large-scale study on selected field-moulded sealants in concrete joints at different hydraulic structures under extremely cold climatic conditions. Other objectives were to specify installation techniques, carry out periodic inspections, evaluate the performance of various types of such sealants that could be of value to all potential users. The project also included a cost effectiveness study. General and specific guidelines were prepared for sealant selection and their installation. Based on these guidelines, different types of sealants, polyurethanes, polysulphides, silicone (1- and 2-component), were selected for the study. They were installed in horizontal, vertical and inclined joints at different locations on five Hydro-Quebec dams, mostly on the crest, and were periodically inspected for their performance. The findings are presented in this paper.