WAQTC Asphalt Level 2 Training and Certification Review Guide.

WAQTC Asphalt Level 2 Training and
Certification Review Guide
How do you select which reduction method to use -

✅ -Refer to agency requirements

-Generally depends on size of sample vs. size of sample need for specific test

-Recommended using mechanical splitter on large amounts for initial reduction (minimizes time &
temp loss)



How do you know if a sample is ready for reduction -

✅ Must be warm enough to separate, if not place back in the oven until soft and workable.

Making sure not to exceed the max mixing temp specified in the JMF



Procedure for mechanical splitter -

✅ -clean and coat all surfaces that will come in contact with the asphalt mix

-place 2 empty containers under the splitter

-empty mix into the hopper with one smooth/uniform pour

-reduce remaining mix by alternating one of the two containers until sample size is reached

-save remaining sample in case further testing is needed



Explain quartering method -

✅ -coat template

-dump sample on to a hard, non-stick, clean, level surface

-mix sample by turning over a minimum of 4 times w/a flat bottom scoop

-flatten pile to a uniform diameter & thickness (diameter is 4-8 times the thickness)

-divide using template

-reduce sample by full quartering or by apex

-full quartering uses diagonally opposite quarters

-apex uses the same section of two opposite quarters cutting from the center point to the outer
edge

, Explain sample reduction use the incremental method -

✅ -cover hard, clean, level surface with sheeting

-place sample and turn over a min of 4 times

-roll pile into a cylinder (loaf)

-remove one quarter to be saved

-remove cross sections until sample size is reached



Can you use multiple splitting methods when reducing a sample -
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@i ✅ Yes
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Why do we need the moisture content in asphalt mixtures -
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@i ✅ To correctly determine the asphalt binder content of the mix
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How to determine the moisture content of an asphalt mixture -
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@i ✅ By comparing the wet mass of the sample after drying to the constant mass of the sample
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What temperature does the oven need to be for determining the moisture content -
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@i ✅ To JMF specification or 325 +/- 25 degrees Fahrenheit
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What size sample is needed for determining the moisture content -
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@i ✅ Minimum of 1000g
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How long do you initially dry a sample when determining the moisture content -
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@i ✅ 90 +/- 5 min further drying is in 30 +/- 5 min intervals until the weight isn't changing more that 0.05%
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What temp does the oven need to be for a burn off -
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@i ✅ 1000 +\- 9 degrees Fahrenheit
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What is the size of the test sample for a burn off based on -
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@i ✅ Nominal maximum size of the aggregate in the asphalt mix
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