Parkade Corrsion Issues
Parkade Corrsion Issues
(OP)
Does anyone have historic information about when parkade corrosion became an issue. I recall in the 1970's that there was a court case in Toronto that was pretty definitive, but have since lost the information I had on this.
It's not for litigation reasons, but for part of a report of a RFP for a parkade restoration proposal.
Dik
It's not for litigation reasons, but for part of a report of a RFP for a parkade restoration proposal.
Dik






RE: Parkade Corrsion Issues
RE: Parkade Corrsion Issues
RE: Parkade Corrsion Issues
When I started working in the late 80's, the corrosion of parking structures was a well studied issue. In the attached reference by Litvan, it aludes that the problem was becoming widespread in the mid 1970's. Looking through an old report I have on the assessment and rehabilitation of bridge structures in Canada, they don't give any specific time period for when the corrosion problems started, however, they due state that there were a significant number of reinforced concrete bridges constructed during the 1950's. At this time, I don't think there was an understanding of the whole rebar, chloride, corrosion problems. Fast forward 10 to 15 years from time of initial construction of these older type bridge structures and you would be expecting to see problems become visible.
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RE: Parkade Corrsion Issues
dik...you might try to contact John Bickley inToronto...ajk1-got a phone number?
RE: Parkade Corrsion Issues
I would guess Mr. Bickley is mostly retired now. There is a number available for him (not in Toronto), however I hesitate to post it on an open forum. The PEO website might have the contact info.
RE: Parkade Corrsion Issues
I was working in Toronto in the mid 70's and by that time, parkade corrosion was a well established item. I met with John Bickley many times, but on other geotechnical issues...
We've been asked to put in a proposal for a parkade repair... and the terms do not include for a complete encapsulation of the existing and there has been no determination of the degree of carbonation... Chain drag and hammer to establish areas of repair. The RFP's are based on a couple of earlier engineering reports that are 'patching' the problem and have relegated the encapsulation (aka membrane replacement) to a minor 'afterthought'. This may not address the issue that the repair may only be a bandaid... and if the chloride intrusion is sufficient, it is essential that moisture be excluded...
The parkade was constructed in the mid 70's using f'c 3000 and 3/4" concrete cover, poor drainage, no hose bibs or maintenance manuals... my earliest parkades were undertaken at that time with 4500 psi, min and 1-1/4" to 1-1/2" conc cover... with drainage, bibs, and manuals (owners never followed this, but it was covered).
Dik
RE: Parkade Corrsion Issues
RE: Parkade Corrsion Issues
We possibly did cross paths, I was a summer student in 1989 on the bridge decks and then started full time upon graduation in 1990. Worked there until about 1994 before moving to Montreal.
RE: Parkade Corrsion Issues
Dik