LENGTH GAUGE - ISI MARKED

Complies with following International Standards:

IS : 2386 (PART-1)

Purpose:

This instrument is used to determine the elongation index of aggregates. Particle is elongated when its length (longest dimension) is more than 1.8 of the midsize of the sieve fraction.

Significance & Use:

This method classifies aggregate elongation by measuring the length of individual particles. The test is not applicable to material retained on a 63.0 mm BS test sieve.

Construction Details:

1. ISI Marked
2. Consists of a hard wood base with vertically mounted S.S. studs 
3. Eight S.S. studs are mounted.
4. Aggregate to be classified is separated into seven sieve fractions from 63 to 6.3mm, and each fraction is examined separately.
5. The mass of all elongated particles (failing to pass between pins) as percent of the sample is the elongation index.
6. The distance between nails is applied according to following table.

Distance between nails (mm) Passing/Retained (mm)

   -----                    63/50

   81.0                    50/40

   58.5                    40/31.5

   -----                    31.5/25

   40.5                    25/20

   32.4                    20/16

   25.6                    16/12.5

   20.2                    12.5/10

   14.7                    10/6.3

Note : Electronic Weighing Balance and Test Sieves as per Table 5 of IS:2386 Part I are essential Items to perform the test  and will be available at extra cost