AASHTO T110:03(2020) Standard Method of Test for Moisture or Volatile| Distillates in Hot Mix Asphalt (HMA).
Note 1—Still diameters of up to 127 mm (5 in.) may be used if required to accommodate larger samples.
4.2. condenser—Of the water-cooled reflux glass-tube type, having a condenser jacket not less than
400 mm (15.75 in.) long, with an inner tube 9.5 to 12.7 mm (0.375 to 0.50 in.) in outside diameter. The end of the condenser inserted in the receiver shall be ground off at an angle of 30 degrees from the vertical axis of the condenser or otherwise con figured to fit the receiver. For mixtures with very volatile solvents, it may be necessary to supplement this water-cooled condenser with a second water-cooled condenser of approximately the same dimensions.
4.3. Receiver—Made of well-annealed glass. of one of the following types depending on the purpose of thc test:
4.3.1. For determination of water in HMA. a glass receiver of 10- or 25-rnL capacity shall he used. The receiver shall be graduated in 0.1 -mL divisions with a ±0.05-mL maximum error below 1 rnL and in 0.2-mL divisions with a ±0.1 -mL maximum error above 1 rnL as specified in Table 1 and Figures 2, 3. 4. and 5. Receivers with tapered or hall-bottom vapor tube ends require adaptors for connection to the metal still.
4.3.2. For determination of the volatile fractions of the HMA. the receiver shall conform to the dimensions shown in Figure 6.
6. TEST SPECIMEN AND SAMPLE
6.1. Thoroughly mix the sample, and weigh out an amount estimated to yield a percentage of moisture or diluent within the capacity of the receiver calibration. Keep the remainder of the sample in its tightly covered container. The weighed sample should not be less than 500 g for normal mixtures. Thoroughly break up this sample to avoid large lumps. and place it in the still.
7. PROCEDURE FOR DETERMINATION OF MOISTURE
7.1. After the sample has been placed in the still, add 200 mL of the solvent, and quickly stir it into the sample.
7.2. Assemble the components of the apparatus as illustrated in Figure 7, choosing the receiver in accordance with the expected water content of the sample and making all connections vapor-tight
and liquid-tight. Insert a gasket of heavy paper, moistened with water, between the still hotly and cover. The condenser tube and receiver must be chemically clean to assure free drainage of water into the bottom of the trap. Insert a loose cotton plug in the top of the condenser to prevent condensation of atmospheric moisture inside it. Circulate cold water through the jacket of the condenser.AASHTO T110 pdf download.