Partially Compacted Weight of Concrete as a Measure of Workablity


  • The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal


Title: Partially Compacted Weight of Concrete as a Measure of Workablity

Author(s): Bryant Mather

Publication: Journal Proceedings

Volume: 63

Issue: 4

Appears on pages(s): 441-450

Keywords: angle of repose;compaction;concrete;consistancy;fresh concrete;mass concrete;research;slump;unit weight;workablity.

Date: 4/1/1966

A study of the compacting-factor method of measuring workability of small-aggregate concrete (1 YZ in.) indicated that: (a) the degree to which concrete heaps when a mold is allowed to overfill from the discharge of a mixer reaches a maximum at an intermediate workability and decreases as the mixture gets either drier or wetter; and (b) the net, loose weight of concrete in a mold after strike off increases with increasing workability. The net, loose weight of concrete in a mold filled to overflowing and then struck off could form the basis for controlling workability of mixtures having a slump not greater than 3 in. Studies using mixtures with 6-in. aggregate indicated that heaping weight, struck-off weight, and compacting factor increase with increased water content until the slump reaches from 1 YZ to 3 in. and then they decrease. Routine determinations of heaping weight or struck-off loose weight might be used to detect batches of excessive or deficient water content which could be rejected before delivery to the forms.