Modern Cement Concrete Highway Construction

Library and Archives Canada: 35mm.
"This film describes how concrete roads are made. Shots include: rocks being quarried, crushed, and piled; sand being excavated, washed, and screened; concrete (which is made up of stone, sand, cement, and water), being mixed and delivered to the job site, where it is poured in small sections; transverse joints added which allow for expansion; a finishing machine passing over the concrete to ensure a smooth surface; covering the concrete under a burlap while it sets; covering it with earth for three weeks while it cures; government officials conducting tests to determine the consistency and strength of the concrete; opening the highway to the public."