San Francisco : Architect and Engineer, Inc · leaf 397
Surface voids disclosed by stoning the surface of a laboratory specimen cast under a slopingwood form. These voids are often hidden by a thin film of cement and fine sand: do not show upwhen forms are stripped in ordinary field operations. SEPTEMBER, 1940 … Field demonstra-tion showing sur-face texture ofconcrete placedat Grand CouleeDam test againstabsorptive linedforms at the top,as compared withconcrete placedagainst woodforms, below. to vertical faces or to steep slopes, while pos-sible, is more difficult. EARLY USES OF FORM LINING The use of…
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