Vacumn Processes Applied to Precast Concrete Houses
K. P. Billner and Bert M. Thorud
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The use of vacumn processes in precast concrete construction simplifies the building of fire-resistant, durable structures designed to permit the maximum use of like units. Vacumn processes have thus far been used in one- and two-story houses and one-story industrial or warehouse structures, but furthur developments should make possible similar benefits for multi-story construction. The specific vacumn methods utilized are: (1) extracting excess water from freshly placed concrete proir to set, thereby increasing early strength and enabling early handling of units, (2) holding forms in place by vacumn and (3) handling and placing finished and hardend concrete units by cast-in-place closures formed and quickly hardened by vacumn processes. The use of these methods results in high strength monolithic construction having exterior and interior finished surfaces, with insulation incorporated into the construction, if desired.