image-stone fragments

STANDARD SPECIFICATIONS
Graded Aggregate Material For Bases or Subbases for Highways or Airports

ASTM D 2940 M-15

Standard Specifications

Graded Aggregate Material For Bases or Subbases for Highways or Airports

Standard ASTM D 2940 M-15

ASTM D 2940 specification covers covers graded aggregates for use as highway or airport bases or subbases.

The gradation of the final composite base/subbase mixture shall conform to an approved job mix formula, within the design range prescribed in the adjoining table.

This TransCalc tool can be used to plot the particle size grading of upto two samples. The input data can also be saved in the form of a pdf report. The plots are interactive and can be zoomed in or out and hovered over for additional data display. The plot can be saved by using the toolbars located on the top right of each plot. Please make use of the help texts provided in each input cell for further guidance on the usage of this tool.

Coarse aggregate retained on the 4.75-mm (No. 4) sieve shall consist of durable particles of crushed stone, gravel, or slag. At least 75% of the particles retained on a 9.5-mm [3⁄8-in.] sieve shall have two or more fractured faces.
Fine aggregate passing the 4.75-mm (No. 4) sieve shall normally consist of fines from the operation of crushing the coarse aggregate. It may be noted that addition of natural sand or finer mineral matter, or both, is not prohibited.
The fraction of the final base/subbase mixture that passes the 75-μm (No.200) sieve shall not exceed 60 % of the fraction passing the 600-μm (No. 30) sieve. The fraction passing the 425-μm (No.40) sieve shall have a liquid limit not greater than 25 and shall have a plasticity index not greater than 4. The sand equivalent value of the fine aggregate shall not be lower than 35.
For material to be used as a subbase at depths greater than probable frost penetration, the plasticity index shall be limted to a maximum of 6 and sand equivalent to a minimum of 30.
It may be noted that, in order to prevent damage by frost action, it might be necessary to specify lower percentages passing the 75-μm (No. 200) sieve than permitted in the table.
Average of all sieve size determinations for a given lot shall comply with the job mix formula within the permissible tolerances shown in adjoining input table. Results of individual batch determinations shall conform to the job mix formula within the tolerances specified in table with an additional tolerance of 2 percentage points for all sizes other than 75-μm (No. 200) sieve.

INPUT: PROJECT AND SAMPLE DETAILS

Please enter the Project Details to appear on the generated pdf report.

Please enter the plot title to appear on the generated particle size distribution (PSD) plot.

Please enter the plot subtitle to appear on the PSD plot.

Please enter the Sample Details to appear on the generated pdf report.

Please enter the trace name to appear on the legend section of the PSD plot.

Please enter the trace name to appear on the legend section of the PSD plot.

Please enter brief remarks to appear on the generated pdf report.


SOIL AGGREGATE MATERIALS: PARTICLE SIZE GRADING INPUT TABLE

Sieve Size, mm Perc. Passing
Sample A
Perc. Passing
Sample B
Base Grading
UL
Base Grading
LL
Subbase Grading
UL
Subbase Grading
LL
Job Mix Tolerance
Base
Job Mix Tolerance
Sub-base
50.0 100 100 -2 -3
37.5 100 95 100 90 ± 5 ± 5
19.0 92 70 ± 8 --
9.5 70 50 ± 8 --
4.75 55 35 60 30 ± 8 ± 10
0.600 25 12 ± 5 --
0.075 8 0 12 0 ± 3 ± 5




PARTICLE SIZE GRADING COMPARISON - CHART



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