Title:
Proposed Revisions to: Standard
Practice for Selecting Proportions for
Structural Lightweight Concrete
Author(s):
ACI Committee 211
Publication:
Concrete International
Volume:
2
Issue:
8
Appears on pages(s):
47-64
Keywords:
absorption; aggregate gradation; air con-tent;
air entrainment; cement content; coarse aggregates;
fine aggregates; fineness modulus;
DOI:
Date:
8/1/1980
Abstract:
Describes, with examples, methods for proportioning and adjusting proportions of structural grade concrete containing lightweight aggregates. The cement content strength method uses a specific gravity factor, determined by a displacement pycnometer test on the aggregates which accounts for variations in moisture content of the aggregates. The weight method also employs the specific gravity factor to estimate the weight per cubic yard of the fresh concrete. Examples are given for systematic calculation of batch weights, effective displaced volumes, and adjustments to compensate for changes either in ag-gregate moisture content, aggregate proportions, cement content, slump, or air content. [Authors]