JMF Part-3 | 0.45 Power Gradation Chart | Asphalt Mix Design ||MaawaWorld||

JMF Part-3 | 0.45 Power Gradation Chart | Asphalt Mix Design ||MaawaWorld||
0.45 Power Gradation Chart
Plotting Gradations;
In the early 1960s, the Bureau of Public Roads (today’s FHWA) introduced a gradation chart
which is an especially useful tool in evaluating aggregate gradations. The chart uses a horizontal scale, which represents sieve size openings in inches (millimeters) raised to the 0.45 power,
and a vertical scale that represents percent passing. An important feature of the 0.45 power chart is the maximum density line. The maximum density line plots as a straight line from the maximum aggregate
size to the origin of the chart. The 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). The NMAS is defined as one
sieve size larger than the first sieve size to retain more than 10 percent of the aggregate gradation.
The maximum density line was developed for rounded, uncrushed materials. The maximum
density condition for crushed particles typically occurs when the gradation is coarser than
the plotted maximum density line and varies depending on the shape and texture of the
aggregate material. As part of the mix design process, the aggregate gradation should be plotted
on the 0.45 power gradation chart. Two Superpave-specific features utilize the
0.45 power chart-control points and a restricted zone.
Control Points;
The control points define the type of mix and act as master ranges between which gradations must
pass. Control points are placed at the nominal maximum size, an intermediate size (2.36 mm),
and the smallest size (0.075 mm). Superpave control point limits vary depending on the nominal
maximum aggregate size of the design mixture as shown in Table 6.3 of chapter 6.
3.2.3.3.
Restricted Zone;
From past experience it was known that if the
gradation would pass through the restricted zone between the #8 and #50 sieves, it was an
indication that there was possibly too much natural sand in the mix, resulting in possible mix
tenderness. The restricted zone was introduced by the Superpave system and it has since been
removed from AASHTO M 323. It resided along the maximum density line between the
intermediate size (either 4.75 mm or 2.36 mm) and the 0.300-mm size. Figure 3.8 shows the
control points and restricted zone for a 12.5-mm Superpave mixture (12.5-mm nominal maximum
and 19.0-mm maximum size). The restricted zone formed a zone through which it was generally.
#0.45PowerGradationChart
#PowerGradation
#GradationChart
#PlottingGradations
#controlpoint
#RestrictedZone
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Thanks for Watching!

[@albaaqiy1160]

I am very happy to watch your excellent programs thanks thanks lot of thanks what a nice teaching method like solution manual ABDUL HAIYY MWAL TM

[@atakhan5477]

Where is 0.45 graph making video? Sir link pls

[@vishnunbtvm]

Hi sir, you posted the power chart drawing in separately?

[@PruthviRout]

Please make a video regarding how to plot a 0.45 power gradation Chart.

[@MaawaWorld]

Ok

[@happening2023]

Sir how do u find field correction factor from JMF to find Gsb

[@albaaqiy1160]

I also need it's soft copy like a model for proceeding practical experience AH MWAL TM

[@MaawaWorld]

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[@TrueFact266]

sir plz send soft copy ..