American Society of Civil Engineers


Effects of Pressure and Aging in SATS Test


by A. C. Collop, (Prof. of Civ. Engrg., Nottingham Transp. Engrg. Centre, Univ. of Nottingham, NG7 2RD, U.K.), Y. Choi, (Sr. Res. Scientist, Australian Road Res. Board, 500 Burwood Highway, Vermont South, VIC 3133, Australia), and G. D. Airey, (Assoc. Prof. and Reader in Civ. Engrg., Nottingham Transp. Engrg. Centre, Univ. of Nottingham, NG7 2RD, U.K.)

Journal of Transportation Engineering, Vol. 133, No. 11, November 2007, pp. 618-624, (doi:  http://dx.doi.org/10.1061/(ASCE)0733-947X(2007)133:11(618))

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Document type: Journal Paper
Abstract: The saturation aging tensile stiffness (SATS) test has been developed to quantify the moisture damage of a range of U.K. asphalt mixtures. In order to combine the effects of moisture and aging, the test is undertaken at an elevated temperature and pressure in the presence of moisture. This paper describes a procedure developed to investigate in detail the effects of aging, pressure, and moisture damage on results from the SATS test. An aging factor has been determined that captures the increase in stiffness modulus due to hardening that occurs at the elevated temperature and pressure. This factor ranges from 1.38 for a dry specimen to approximately 1.2 for a fully saturated specimen. A pressure factor has been determined that captures decreases in stiffness modulus due to pressure. Results show that the pressure factor is lower for the asphalt containing the basic aggregate, indicating a greater sensitivity to pressure compared to the mixture containing the acidic aggregate. The depressurization temperature in the SATS test protocol was reduced from 85 to 30°C to minimize this effect. A moisture factor was calculated, which is a measure of the moisture sensitivity of the asphalt mixture. Results showed that the moisture factor was significantly lower for the asphalt containing the acidic aggregate, indicating greater moisture sensitivity.


ASCE Subject Headings:
Aggregates
Aging (material)
Asphalts
Moisture
Saturation
Stiffness