Abstract
This paper presents an analysis of data from surface elevation surveys performed on 971 newly constructed posttensioned slabs-on-ground for single-family structures in California. The results of 1,368 manometer surveys were collected by the California Geotechnical Engineers Association (CGEA) and made available for this study. The parameters studied were maximum elevation differential, maximum elevation differential along the edges, maximum edge-to-interior differential, maximum local gradient, and local levelness FL number. In addition, data from 397 slabs surveyed both before tensioning and after tensioning/loading were analyzed. Results of the statistical analyses are presented in the form of histograms and cumulative frequency distribution curves, as well as in tabular form. The study showed that posttensioned slabs-on-ground for residential structures are not built level; they typically have some as-built elevation differentials and local gradients. If manometer surveys are made on newly constructed ...
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