Evaluation of the High- and Low-Temperature Performance of Asphalt Mortar Based on the DMA Method

Abstract

Asphalt mortar is a typical temperature-sensitive material that plays a crucial role in the performance of asphalt mixture. This study evaluates the high- and low-temperature performance of asphalt mortar based on the dynamic mechanical analysis (DMA) method. Temperature-sweep tests of asphalt mortars were conducted using the DMA method under fixed strain level, frequency, and heating rate conditions. The dynamic mechanical response curves, characteristic temperature, and other indices were obtained and used to investigate the high- and low-temperature performance of asphalt mortar. The results showed that the phase transition temperatures T1, T0, and Tg can be used to evaluate the low-temperature performance of asphalt mortar. Additionally, they had a good linear relationship, and the evaluation results were consistent. Meanwhile, T2, E60, and tan(δ)max indicators can effectively evaluate the high-temperature performance of asphalt mortar. Asphalt plays a key role in the performance of asphalt mortar. Mortars with neat asphalt A70 and modified asphalt AR had the worst and best high- and low-temperature performances, respectively. Furthermore, the finer gradation improved the low-temperature performance of asphalt mortar, while the coarser gradation improved the high-temperature properties of modified asphalt mortars but had the opposite effect on neat asphalt A70.

Pultrusion preparation and properties of continuous glass fiber reinforced polylactic acid thermoplastic composites

“…45,46 Normally, it is assumed that the peak of tan δ is the glass transition temperature (T g ) of the material. 47 As can be seen from the Figure 7d, the increase of CGF content causes the T g of CGF/PLA to move towards high temperature. This is because CGF has a certain hindering effect on the movement of the PLA chain segment compared with pure PLA, and the molecular chain segment movement of the CGF/PLA requires higher temperature.…”

“…Generally, tan δ is the ratio of the material's loss modulus (E″) to the storage modulus (E′), reflecting the material's internal friction under alternating forces 45,46 . Normally, it is assumed that the peak of tan δ is the glass transition temperature (T g ) of the material 47 . As can be seen from the Figure 7d, the increase of CGF content causes the T g of CGF/PLA to move towards high temperature.…”

Long-Term Performance Evolution of RIOHTrack Pavement Surface Layer Based on DMA Method

“…Therefore, the study of the phase state of the asphalt mixture is important for characterizing the service state of the pavement. Therefore, in this study, the test method of dynamic mechanical analysis was chosen to investigate the service condition of in-service pavement materials in relation to the service condition [11].…”