The 50kN capacity and fully variable speed of 0. The load jack, DC motor and controls are housed in an ergonomic cabinet. Prior to the test, the operator can impose travel limits for automatically ending the test. No external transducer is required for displacement measurement. The firmware allows performance of transducer calibrations and setting of up to 10 test profiles, saving data onboard. A real-time test graph and transducer data are displayed on the touchscreen.

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Technician Training and Certification Program January This method covers the measurement of the resistance to plastic flow of cylindrical specimens of bituminous paving mixture loaded on the lateral surface by means of the Marshal apparatus.

The results from this test may be used to compare the ratio of stability to flow. Stability to flow ratios and above, to some extent, indicate a mix that may be rut resistant, while values below could be prone to rutting and a tender mix. Modifications: 1. Any method of maintaining the temperature of the testing head may be used and shall not be limited to a water bath.

The compacted specimen shall be stabilized in the mold for 10 to 20 minutes before extruding in order to prevent distortion. A mechanically operated hammer shall be used. Key Elements:. Molding of Briquettes. Obtain sample. The sample shall be of. Three specimens shall be molded and the. If a briquette is damaged, the additional material will be used to mold a new third briquette. Obtain sample in accordance with T Modified.

Note: The intent of this test procedure is that the first three molded briquettes be used in determination of results. It is not the intent of this test that all four briquettes are molded and the three closest results be used, or all four briquettes be used to determine the average.

Inspect, adjust, and calibrate apparatus. Mold assemblies 2. The mechanical hammer used for compaction must be adjusted to give results comparable with the calibrated hand hammer Note 2. To be considered comparable, the average bulk density of three 3 hand compacted specimens and three 3 mechanically compacted specimens must be within 0.

Heat mold assemblies, hammer and hand tools. Heat the mold assemblies to the molding. The compaction hammer shall be heated to between All hand tools shall be heated during use. The mold assembly and face of the compaction hammer shall be thoroughly cleaned 3. Bring sample to mixing temperature. Heating of the mix in the mold will not be allowed at any time. Place mix in mold.

Place a paper filter in bottom of the mold and add the entire batch of heated. Spade the material vigorously with a heated spatula 15 times. Smooth the surface to a slightly rounded. Compact material. Unless otherwise noted, apply 75 blows with the compaction hammer.

Reverse and reassemble mold and apply appropriate number of blows to second side as quickly as possible to prevent loss of heat. Extract specimen from mold. Let the specimen stabilize for 10 to 20 minutes in the mold, then. Cure specimen.

Once specimen is removed from mold, place the specimen on a smooth, flat surface and allow specimen to stand overnight at room temperature 3. Stability and Flow. Weigh specimen. Measure height of each specimen. Record height. Measure specimen height to nearest 1. Immerse in water bath. Prepare compression testing machine, breaking head, and flow meter.

Thoroughly clean guide rods and inside surfaces of the breaking head, and lubricate guide rods so that the upper test head will slide smoothly over them. Maintain testing head temperature between Zero flow meter using dry, unbroken briquette. Inspect compression. Place specimen in breaking head and place on testing machine. Remove specimen from water bath and place in lower portion of breaking head, place upper portion of breaking head on specimen, position assembly in testing machine.

Place flow meter over longer guide rod and verify zero on dial 4. Apply load. Hold flow meter firmly against the upper segment of the breaking head while applying load 4. Apply load at a constant rate of Immediately remove flow meter. Complete steps 5 and 6 within 30 seconds 4. Record flow and maximum load.

Compute results. Using the current calibration chart for the compression-testing machine, calculate stability for each specimen. If height of the specimen is other than Report results. The stability test result is reported as the average load of three specimens.

The flow is the average of the three specimens recorded in hundreds of an inch 5. Learn more about Scribd Membership Home. Much more than documents. Discover everything Scribd has to offer, including books and audiobooks from major publishers. Start Free Trial Cancel anytime. Uploaded by Devela Avinash. Date uploaded Mar 16, Did you find this document useful? Is this content inappropriate? Report this Document. Flag for Inappropriate Content.

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AASHTO T-245 2003



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