Details

Autor(en) / Beteiligte

• Dan, Han-Cheng
• Ling, Chongyu
• Cao, Wei
• Wang, Zelin
• Liu, Jin

Titel

Fatigue behavior and phenomenological modeling of porous asphalt concrete under freeze–thaw cycling

Ist Teil von

• Materials and structures, 2021-12, Vol.54 (6), Article 235

Ort / Verlag

Dordrecht: Springer Netherlands

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Porous asphalt concrete (PAC) is prone to fatigue cracking and moisture damage due to its open gradation and high air voids. This study presented a systematic evaluation of the role of moisture damage on the fatigue performance of PAC. The mixture was designed with a high-viscosity modified asphalt and target air void of 20%. Moisture damage was induced into the compacted specimens via different numbers of freeze–thaw (F–T) cycles, and was quantified by the parameter D m defined as loss in the indirect tensile (IDT) strength. Fatigue characterization adopted both the single- and two-stage loading patterns and was approached by phenomenological modeling. Results indicated that the PAC strength reduced with the F–T cycle number at a decreasing rate, following an exponential decay function. The single-stage fatigue characterization yielded an S–N relationship where the intercept and slope both depended exponentially on D m . In the two-stage characterization, the Miner’s sum declined with D m indicating the weakening effect of the moisture conditioning. Fatigue life results from the high-low sequence seemed to suggest the presence and escalation of material sensitivity to the load level change between the two stages for F–T cycle ≥ 3. The Corten–Dolan model was adapted and applied to the two-stage loading. For both the high-low and low–high sequences, a unified expression for the parameter d in terms of D m and the first cycle ratio α was derived. The investigation revealed that the fatigue performance of PAC became more sensitive to stress level with higher moisture damage, and exhibited higher dependence on moisture damage under larger load levels.