AASHTO TP 130:2018 Standard Method of Test for Producing Draw Down Panels and Measuring the Coefficient of Retroreflected Luminance (RL) of Pavement Markings in a Laboratory Panel

AASHTO TP 130:2018 Standard Method of Test for Producing Draw Down Panels and Measuring the Coefficient of Retroreflected Luminance (RL) of Pavement Markings in a Laboratory Panel. 6.9. Reflectometer, 30 m geometry based on rctrorcflective measurements made with portable hand- operated instruments in compliance with ASTM E1710; 6.10. Paint film thickness gauge, 5-30 mu (125-750 microns); and 6.11. Magnifying glass to check glass bead embedment. 7. SAMPLING 7.1. A representative sample of glass beads meeting the requirements of M 247. Type I should be taken following T 346 procedures. The sampling shall be random in the following ratios: 100 lb (45 kg) of sample (in full bags) per 10,000 lb (4,535 kg) shipped. Upon arrival, material shall be reduced in a sample splitter to a size of approximately 2.2 lb (1 kg). 8. CALIBRATION 8.1. The draw down procedure must he calibrated to ensure the correct thickness of paint is applied. The retrorcflectomctcr must be calibrated in accordance with the manufacturer’s instructions. The retroreflectivity is very dependent on the paint formula in addition to the glass bead quality. Use a control paint to compare glass head retroreflectivity (Sherwin Williams TM2 152 White). Note 1—Use of this specific control product was chosen by NCI-IRP research team to minimize the test variables and compare testing and final retroreflection performance. Users could consider alternate control traffic paints to suit their specific needs. 8.2.1. Choose a draw down bar opening to achieve 15-mil wet film of paint thickness. 8.2.2. Pour enough paint into the draw down bar to ensure coverage over the full 18 in. panel. approximately 100 mit (Figure 2). 8.2.3. Draw the draw down blade in a smooth manner down the plate. 8.2.4. Immediately place the draw down blade into water to make clean up easier. 8.2.5. Stick the paint film thickness gauge into the wet paint and read the paint thickness. 8.2.6. Use a dittrent mu thickness accordingly (it’ 30 mu open yields 20 mu wet, use a smaller mu opening such as 25 mu to achieve the desired 15 mu wet paint). 8.2.7. Repeat previous steps to check the resulting wet paint thickness.AASHTO TP 130 pdf download.