Asphalt Testing Methods for How To Perform Asphalt Binder Testing for the Content by the Ignition Oven Method According to AASHTO T308
This Procedure Covers Asphalt Test Methods for Asphalt Binder Content by the Ignition Oven Method According to AASHTO T308
The tools needed to determine the asphalt binder content by the ignition oven method
The tools required for this test are are the ignition oven, face shield, heat resistant gloves, loading fork, scale, wire brush or asphalt tool, cool-down safety cage, and a heat resistant surface or a cool-down plate.
Begin The Asphalt Test Method Using The Ignition Oven Procedure According To AASHTO T308
Step 1: Start the asphalt binder testing procedure
To begin the test you will need to turn on the ignition oven and set the chamber temperature used to determine the binder content correction factor. Which is typically around 1000°F.
Step 2: Obtain a representative portion of the asphalt mixture
Once you oven dry the sample, you will then collect a separate representative sample and determine the moisture content.
Step 3: Place the basket assembly on the scale platform
Then record the mass of the entire empty basket assembly, then remove it from the scale.
Step 4: Fill half of the asphalt basket assembly at a time
Take the top portion of the asphalt basket assembly off and and set it aside.
Step 5: Set half of the sample in the bottom basket
Make sure the sample is evenly distributed in the bottom basket and move the mix away from the basket edges (show in image above) to prevent material loss during testing.
Step 6: Attach the top half of the asphalt basket assembly back on
Remove the lid so you can place the remaining half of the sample in the top basket. Again, make sure to evenly distribute the asphalt sample and move the mix away from the basket edges.
Complete the asphalt binder testing sample/basket assembly by securing the lid and assembly guard
Step 7: Put the basket assembly on the scale platform
In addition, you will zero the scale and place the basket assembly that is full with asphalt on the scale platform. And then record the total mass of the basket assembly and sample.
Step 8: Calculate the initial mass of the sample
By subtracting the mass of the empty basket assembly from the total mass of basket assembly and sample you will get the initial mass. Ensure that you round the initial mass of the sample to the nearest one gram.
Step 9: Input the binder calibration factor on the oven
Press the “calib. factor” button (shown in image above), and then quickly entering the value and pressing enter. The decimal is automatic, so a value of 0.18 would be entered as 018. You will need to verify the entry by pressing the “calib. factor” button again.
Step 10: Press the weight button on the oven
You will input the initial mass of the sample by pressing the weight button, entering the initial mass and pressing enter. Also verify the initial mass by pressing the weight button again.
Step 11: Next you will zero the ignition ovens internal scale
Click the zero button on the asphalt ignition dashboard (see the yellow arrows). Verify that the scale reads 0.0.
Step 12: Open the ignition oven door
Stand behind the door as it is open to prevent possible burns. Using the loading fork, you will load the basket assembly into the oven, placing it gently on the ceramic scale platform.
Make sure not to drag the asphalt binder testing sample/basket across the ceramic plate as this could damage the internal scale. Then position the basket so that it is not in contact with the oven walls and will not touch the insulation on the front door when closed. Then close and latch the door.
Step 13: Verify that the total mass of the basket assembly
Make certain that the sample shown on the oven display is within five grams of the total mass recorded from the external scale. If not, you will need to reposition the basket assembly to eliminate rubbing, or check the scale calibration. Once verified, press the start button.
Step 14: No additional loss over a three minute time period
When the ignition oven detects no additional loss over a three minute time period, the burn is complete. You will need to stop the burn sequence and collect the data ticket. Then record the calibrated asphalt content from the ticket to the nearest to 0.01%.
Step 15: Take the basket assembly out of the ignition furnace
With the loading fork, remove the basket assembly out of the oven and place it on a heat resistant surface, capable of withstanding 1,202°F. Make sure to cover the sample with the protective shield and allow the basket and aggregate to cool to room temperature.
If the asphalt binder testing sample was not dried to constant mass prior to burning, subtract the moisture content from the calibrated asphalt content shown on the ticket. You will report the binder content to the nearest to 0.1%.
If the remaining aggregate is to be used for a gradation analysis, carefully empty the basket into a container, perform the gradation analysis according to AASHTO T30
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