211.2R-91: Standard Practice for Selecting Proportions for Structural Lightweight Concrete

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Title: 211.2R-91: Standard Practice for Selecting Proportions for Structural Lightweight Concrete

Author(s):

Publication: Technical Documents

Volume:

Issue:

Appears on pages(s): 18

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Date: 1/1/1991

Abstract:

Note: 211.2R-91 is no longer available. This document was replaced by 211.2R-98.

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 aggregate moisture content, aggregate proportions, cement content, slump or air content.