Restoration of a Concrete Clarifier Structure

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Title: Restoration of a Concrete Clarifier Structure

Author(s): Stephen H. Tsui

Publication: Special Publication

Volume: 85

Issue:

Appears on pages(s): 229-238

Keywords: cracking (fracturing); patching; concrete; repairs; scaling; seepage; thermal stresses; proofing; water tanks. -- reinfo water- rced

Date: 4/1/1985

Abstract:
This paper reports the structural investigation, concrete testing, and rehabilitation program for a concrete clarifier in a water treatment plant at Belle River, Ontario, Canada. This plant was constructed in 1945 with non-air entrained, site mixed concrete. Extensive concrete scaling and spalling, traces of leakage and random cracking were observed on the tank wall surfaces. Both analytical methods and in-situ testing were employed to evaluate the structural adequacy of the clarifier. removal of deteriorated concrete, Remedial works involving construction of an exterior semi-circular protective concrete wall with buttresses plus repairs to the interior wall were completed in July, 1981.