Aggregates which are flaky and/or elongated will often lower the workability of a concrete mix and may also affect long term durability. In bituminous mixtures flaky aggregate makes for a harsh mix and may also crack and break up during compaction by rolling.

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In some construction applications, the use of flat or elongated particles of aggregates can interfere with consolidation and cause problems during placement.

The Proportional Caliper Device is used to determine the percentages of flat or elongated particles in coarse aggregates. It consists of a steel base plate with two fixed posts and a pivot mounted swing arm. The axis position can be changed to achieve the desired ratio of opening dimensions.

Model No. Desc
42-0405 Proportional Caliper Device