File:America's Highways 1776–1976 - page 328.jpg

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English: Concrete slabs are subjected to daily applications of deicing agents, such as calcium chloride, to determine the durability of the concrete or the effectiveness of various protective treatments.
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Source https://en.wikisource.org/wiki/Page:America%27s_Highways_1776%E2%80%931976.djvu/334
Author Federal Highway Administration

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Public domain This image is a work of a United States Department of Transportation employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain.

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