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0.45 Power Chart

Plotting Tools

Particle Size Grading - 0.45 Power Chart

Reference Asphalt Institute MS 2

0.45 Power Chart, introduced by the Bureau of Public Roads (present day FHWA) during early 1960's is a tool to evaluate aggregate gradations. The chart is characterized by a horizontal scale, which represents sieve size openings in inches or millimeters raised to the 0.45 power, and a vertical scale that represents percent passing and a maximum density line (MDL) which is a straight line that extends from the maximum aggregate size to the origin of the chart.

Maximum Aggregate Size - maximum aggregate size is typically the largest sieve size through which 100 percent of the aggregate will pass. The maximum aggregate size is defined as one sieve size larger than the nominal maximum aggregate size (NMAS).
Nominal Maximum Aggregate Size (NMAS) - NMAS is defined as one sieve size larger than the first sieve size to retain more than 10 percent of the aggregate gradation.

This TransCalc plotting tool can be used to plot 0.45 power charts for a sample gradation with reference to selected specification limits. The input data can also be saved in the form of a pdf report.

How to use this Tool:
1. Input the project and sample details in the respective fields in the 'INPUT - PROJECT & SAMPLE DETAILS' section. Please select the nominal maximum aggregate size (mm) of the sample in the dropdown field. The typed in information will reflect in the generated plot and/or the generated pdf report.
2. Click on 'Insert Row' button in the 'PARTICLE SIZE DISTRIBUTION PLOTS' section to add the required number of rows (corresponding to the number of sieve sizes used in the sieve analysis test) and type in the details of sieve size in first column and % passing values of the samples in the second column.
If the results are to be compared with a reference standard specification, please input the appropriate '% Passing Upper Limits' and '% Passing Lower Limits' values in the last two columns.
3. Click on the 'Plot' button to display the 0.45 Power Chart in the '0.45 POWER CHART' section.
4. The generated plot is 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.
5. Click on the 'Generate Report' button to open up a pdf report in a new tab.
Note: Please make use of the help texts provided in each input cell for further guidance on the usage of this tool.

Input - Project & 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 select the nominal maximum aggregate size (mm) of the sample.

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

Please enter the sample name to appear on the PSD plot and in the generated pdf report.

Please enter the details of specification (AASHTO, ASTM etc.) to appear on the legend section of the PSD plot.

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

Particle Size Distribution Plots: Input Table

Sieve Size, mm % Passing
% Passing/CP
Upper Limits
% Passing/CP
Lower Limits


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The information and calculation tools provided on website (the "Service") is for general information purposes only. TransCalc assumes no responsibility for errors or omissions in the contents on the Service.In no event shall TransCalc be liable for any special, direct, indirect, consequential, or incidental damages or any damages whatsoever, whether in an action of contract, negligence or other arising out of or in connection with the use of the Service or the contents of the Service. TransCalc reserves the right to make additions, deletions, or modification to the contents on the Service at any time without prior notice.