Looking ENE from approach to Clark Bridge.
<p>Pouring last section (SW corner) of top floor of Witherspoon Street parking garage. This is an example of a <a rel="nofollow" class="external text" href="http://www.concreteconstruction.net/how-to/construction/post-tensioned-slabs_o">post-tensioned slab</a>.
At lower left, Schwing 1200/32 <a href="https://en.wikipedia.org/wiki/concrete_pump" class="extiw" title="w:concrete pump">concrete pump</a> is fed by two <a href="https://en.wikipedia.org/wiki/Concrete_mixer" class="extiw" title="w:Concrete mixer">concrete trucks</a>; when one is empty, the other can begin unloading right away so the flow of <a href="https://en.wikipedia.org/wiki/concrete" class="extiw" title="w:concrete">concrete</a> is not interrupted.
Left of center, man in plaid shirt controls position of placing boom and rate of concrete flow via remote box connected by cable to concrete pump.
Workers use 2x4s, shovels and <a rel="nofollow" class="external text" href="http://www.concretenetwork.com/concrete/concrete_tools/bull_floats_and_darbies.htm">"bull floats"</a> to smooth surface of fresh concrete. A <a href="https://en.wikipedia.org/wiki/power_trowel" class="extiw" title="w:power trowel">power trowel</a> is used to create a smooth finish. (See <a rel="nofollow" class="external text" href="http://www.cement.org/cement-concrete-basics/working-with-concrete/placing-and-finishing-concrete">"Placing and Finishing Concrete"</a>.)
I-64 and JFK Bridge in distance.
.
<a rel="nofollow" class="external text" href="http://www.concretepumpingdepot.com/productdetail.php?UniqueID=753&amp;imgsel=pic1url">Schwing 1200/32</a> ["32" refers to 32-meter vertical reach of placing boom] is discontinued; current version is <a rel="nofollow" class="external text" href="http://schwing.com/products/s32x/">S 32 S</a>
.
Louisville, Kentucky.
April 1988.
.
file # 88d109.
35 mm Kodachrome.
Plustek OpticFilm 7600i.
Siverfast 8.
Picture Window 6.
unsharp mask (radius 1,threshold 3, 100%).
</p>
JPEG quality 95.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/70020260@N04">William Alden</a> from Louisville, Kentucky, USA
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/bill_alden/28949709823/">88d109: Pouring top floor of Witherspoon Street garage</a>