Abstract
This paper focuses on investigating the fatigue properties of cold-recycled emulsified asphalt mixtures (CEAMs) designed via two different compaction methods. First, two different CEAM compaction procedures were investigated and evaluated, including the modified Marshall compaction method (MMCM) and the vertical vibration testing method (VVTM). Indirect tensile fatigue tests were then performed to research the fatigue lives of CEAMs fabricated via the two methods. Finally, a Weibull distribution was applied to analyze the fatigue test results, and the fatigue equation was constructed. The results indicated that the average mechanical strength ratio between the CEAM samples produced by VVTM and the field core samples was >92%, whereas the average ratio of the specimens shaped by the MMCM was <65%. Compared with MMCM-molded CEAMs, VVTM-fabricated CEAMs showed decreased optimal moisture and emulsified asphalt contents by 11% and 9%, respectively, but exhibited improved moisture stability, anti-cracking performance, and anti-rutting performance by 4%, 12%, and 35%, respectively. The fatigue equations established on the basis of the Weibull distribution could effectively assess the fatigue life of CEAMs. The VVTM-manufactured CEAMs showed good resistance of stress change sensitivity and fatigue failure under different stress ratios. The VVTM-compacted CEAMs demonstrated increased fatigue life by 36% at a stress ratio of 0.45 and by 325% at a repeated load of 0.27 MPa compared with the MMCM-fabricated CEAMs.
Highlights
The recycling of reclaimed asphalt pavement (RAP) has been developed worldwide because of its remarkable economic and environmental benefits [1,2]
vertical vibration testing method (VVTM) and the Chinese common design method were used to investigate the influence of different compaction methods on the mechanical and physical properties of cold-recycled emulsified asphalt mixtures (CEAMs)
The present study investigated the fatigue properties of the cold-recycled emulsified asphalt mixtures (CEAMs) manufactured via the vertical vibration testing method (VVTM) and the modified Marshall compaction method (MMCM)
Summary
The recycling of reclaimed asphalt pavement (RAP) has been developed worldwide because of its remarkable economic and environmental benefits [1,2]. The fatigue properties of cold-recycled mixtures must be further investigated for recycled material evaluation and pavement design. Thanaya et al performed an indirect tensile fatigue test on cold asphalt mixtures that incorporated cement [11]. The addition of 1–2% cement improves the fatigue life of cold-recycled mixtures at low strain levels. Compared with hot mix asphalt mixtures, cold recycled mixtures have longer fatigue life and larger tensile strain at the failure point under lower stress levels. Sun et al proposed the fatigue failure criteria of CEAMs on the basis of the indirect tensile fatigue test and proved the temporary improvement of the fatigue life of cold-recycled mixtures during the early service stage [17]
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