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Evaluation of ASTM Standard Consolidation Requirements for Preparing High-Strength Concrete Cylinders.


pdf icon Evaluation of ASTM Standard Consolidation Requirements for Preparing High-Strength Concrete Cylinders. (657 K)
Carino, N. J.; Mullings, G. M.; Guthrie, W. F.

High-Performance Concrete: Design and Materials and Recent Advances in Concrete Technology, 3rd Proceedings. ACI International Conference. American Concrete Institute. ACI SP-172. ACI SP 172-39. December 2-5, 1997, Kuala Lumpur, Malaysia, American Concrete Institute, Farmington Hills, MI, 733-768 pp, 1997.

Keywords:

cylinders; concretes; building technology; compressive strength; consolidation; density; experimental design; high strength concrete; segregation; statistical analysis

Abstract:

An experimental study was designed to accomplish the following: 1) Compare densities and strengths of cylinders prepared by vibration or rodding following current ASTM C21 and Cr 50151uirements for the number of layers; 2) Investigate whether the experience of the operator affects cylinder strength when vibration and rodding are used to consolidate the specimens; and 3) Compare the strengths of 100 mm x 200 mm rodded cylinders prepared by using two or three layers with the strengths of 150 mm x 300 mm rodded cylinders. Two experiments were designed: 1) a half-fraction, factorial design with the following factors: cement content, slump, cylinder size, consolidation method, and operator; and 2) a comparative design to compare the strengths of 100 mm diameter cylinders rodded using two or three layers with the strengths of 150 mm diameter cylinders.