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RE: Concrete Repair

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I tell the younger engineers with whom I work, "primum non nocere".  The statement is attributed to Hippocrates of Kos.  "First do no harm"
The irony in the above statement is that Hippocrates of Kos lived from about 460 BC until 370 BC and was Greek, the quote attributed to him is generally in Latin.  Hippocrates never spoke Latin.  This is a real knee slapper in some academic circles.  At least that is what Hippocrates told me. 
In discussing this further with a philosophy professor colleague, he informed me that in Roman times, students studied all subjects in Latin.  The exception was philosophy which was studied in Greek.  It wasn't until middle ages that all scholastics were studied in Latin, and the works of the classic Greek philosophers were translated from Greek into Latin.  Up into the 1800's both Greek and Latin were required in most colleges. 
...just a bit of an interesting tidbit on a Friday. 

Regards, Harold Sprague


From: MStuart(--nospam--at)
To: seaint(--nospam--at)
Subject: RE: Concrete Repair
Date: Fri, 6 May 2011 17:05:45 +0000

Truer words were never spoken:


D. Matthew Stuart, P.E., S.E., F.ASCE, SECB
Structural Division Manager

Pennoni Associates Inc.
One Drexel Plaza
3001 Market Street, 2nd Floor
Philadelphia, PA 19104
Office 215-222-3000 x7895 | Direct 215-254-7895
Fax 215-222-0789 | Mobile 908-309-8657 | mstuart(--nospam--at)


From: Harold Sprague [mailto:spraguehope(--nospam--at)]
Sent: Friday, May 06, 2011 12:51 PM
To: seaint(--nospam--at)
Subject: RE: Concrete Repair


I would first focus on the concrete assessment.  Have you performed any testing on the parent concrete such as chloride ingress testing, ASR testing, or petrographic analysis?  Is this in the Long Beach area?  How far from the ocean? 
I have seen repairs where the repair initiated galvanic action and significantly accelerated the rate of corrosion. 

Regards, Harold Sprague


From: ENGRLAINES(--nospam--at)
Date: Thu, 5 May 2011 19:37:57 -0400
Subject: Concrete Repair
To: seaint(--nospam--at)

Question for the concrete repair experts:

  An 80-year old concrete building with cantilevered concrete balconies. Tops of the slabs have sound waterproofing coating but water has penetration the sides of the slab and caused rusting of the edge rebar which in turn caused spalling of concrete.

  I want to chip away the unsound concrete, wire brush the exposed rebar, then coat the rebar and newly exposed concrete with a sealer, then apply a mortar with some type of additive (epoxy, polyester, or a polymer like latex). Then a concrete sealer.

  Any suggestions on the repair methodology or product recommendations?



Charles Laines, S. E.
Long Beach, CA