Title: Standard Practice for Selecting Proportions for Structural Lghtweight Concrete (ACI 211.2)

Author(s): ACI Committee 211

Publication: Materials Journal

Volume: 87

Issue: 6

Appears on pages(s): 638-651

Keywords: chlorides; concretes; porosity; x-ray diffraction; Materials Research

DOI: 10.14359/1919

Date: 11/1/1990

Abstract:
Describes, with examples, two methods for proportioning and adjusting proportions of structural grade concrete containing lightweight aggregates. The weight (pycnometer) method uses a specific gravity factor determined by a displacement pycnometer test on the aggregates (Method 1). The weight method also employs the specific gravity factor to estimate the weight per yd3 of fresh concrete. The damp, loose volume method uses the cement-strength relationship for design for all lightweight and sand-lightweight concretes (Method 2). Examples are given for systematic calculation of batch weights, effective displaced volumes, and adjustment to compensate for changes in aggregate moisture content, aggregate proportions, cement content, slump, and/or air content.