Evaluation of ASTM Standard Consolidation Requirements for Preparing High-Strength Concrete Cylinders.
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.
Building and Fire Research Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899