Concrete Proportioning and Control for the "Skylong"


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Title: Concrete Proportioning and Control for the "Skylong"

Author(s): L. R. Lauer and R. J. Rigby

Publication: Journal Proceedings

Volume: 63

Issue: 9

Appears on pages(s): 897-910

Keywords: coefficient of variation, compressive strength, graphical method, mix, proportioning, quality control, set-retarding admixture, slip forming , standard deviation, tower.

Date: 9/1/1966

Reports on the concrete quality control procedures for the "Skylon Tower" of the Niagara International Centre, Niagara Falls, Ontario, Canada. The procedues use a graphical method to determine mean strength, standard deviation, and coefficient of variation and its application to the mixes used on the project. The graphical method is compared with ACI 214-65. The ready-mixed concrete supplier first established the efficiency of two batching plants which would supply concrete to the project, based on past concrete cylinder compression test results. Two different classes of concrete were used, requiring separate preliminary mix proportioning programs. Plant efficiencies were determined for each concrete section and adjustments made as warranted in succeeding concrete sections to effet maximum economies while maintaining specified performance.