Concrete in the country / [American Cement Company]. (1910)
American Cement Company · Association of American Portland Cement Manufacturers · leaf 35
must be continuously protected from tlie rays of the sun and from the w4ndfor at least three days, so that it will not dry out at any time. This can be easilydone by covering the concrete when it is hard with hay, straw, or old carpet. Thiscovering should be thoroughly soaked with water, and kept…