File:America's Highways 1776–1976 - page 327b.jpg
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Summary
| Description |
English: Research engineer scans slice of concrete with microscope to determine size and distribution of air voids, important in the durability of concrete, especially under the action of freezing temperatures. |
| Date | |
| Source | https://en.wikisource.org/wiki/Page:America%27s_Highways_1776%E2%80%931976.djvu/333 |
| Author | Federal Highway Administration |
Licensing
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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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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 21:20, 4 January 2023 | | 1,038 × 977 (566 KB) | Sp1nd01 | Uploaded a work by Federal Highway Administration from https://en.wikisource.org/wiki/Page:America%27s_Highways_1776%E2%80%931976.djvu/333 with UploadWizard |
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