Evaluation of ASTM Standard Consolidation Requirements for Preparing High-Strength Concrete Cylinders.
Evaluation of ASTM Standard Consolidation Requirements
for Preparing High-Strength Concrete Cylinders.
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.
cylinders; concretes; building technology; compressive
strength; consolidation; density; experimental design;
high strength concrete; segregation; statistical
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