Evaluating the Moisture Resistance of Foam Warm Mix Asphalt Using Image Processing Method

Moisture damage is one of the major concerns of asphalt mixes. Warm mix asphalts (WMA) are more prone to this distress. Various methods were suggested during the recent years forevaluating the performance of asphalt mixes against this failure. Image processing method was employed to detect the stripping severity of mixes after Texas boiling test. Since this test is based on visual evaluation, a novel index was suggested to quantify the results and decrease the impact of operator mistake. Furthermore, modified Lottman test was used to determination of tensile strength ratio (TSR) index. Finally, a statistical model was regressed to evaluate the signification and correlation of stripping index and TSR. The results of statistical analysis showed that relation between suggested stripping index and TSR is significant with respect to 95% confidence level. In addition, high magnitude of R2 (94%), shows that the regressed model is able to predict the TSR satisfactory based on stripping index.

کلیدواژه ها:

Moisture susceptibility ، Foam warm mix asphalt ، TSR ، Image processing method