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Re: Surface Penetrating Radar (SPR)

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Bill,

We own and operate a surface penetrating radar and use it often on concrete and masonry. Typical rates are $2,500 to $3,000 a day which makes it pretty steep for a homeowner. I'd recommend (as someone else already suggested) that you try sounding of the wall with a small hammer. Any areas with hollow sounding cells can be drilled into through the bed joint (watch out for joint steel). If the cell is hollow, the drill will skip once past the face shell. We often use a fiber-optic borescope to look into the cell and determine the extent of the void but the brute force method (i.e. drill until you encounter grout) works also.

If you wish to persue the use of radar, the GSSI website has service providers per state. See:
http://www.geophysical.com/ServiceProviders.htm

Regards,
Dave


David B. Woodham, P.E.
Atkinson-Noland & Associates
2619 Spruce St.
Boulder, CO 80302
303.444.3620

----- Original Message ----- From: "Bill Allen" <t.w.allen(--nospam--at)cox.net>
To: <seaint(--nospam--at)seaint.org>
Sent: Wednesday, February 09, 2005 11:27 AM
Subject: Surface Penetrating Radar (SPR)


There's an article in this month's issue (February, 2005) of Structural Engineer magazine discussing this technique and the devices used in applying this technique. The article starts on page 22.

Is anyone familiar with a firm or firms who do this kind of testing in Southern California? I have a client (homeowner) who is skeptical that all the cells in the basement wall I designed are grouted solid, even though there is a deputy inspector on the job and the contractor is using a vibratory device.

TIA,

T. William (Bill) Allen, S.E. (CA 2607)


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