Performance evaluation of asphalt mixtures containing warm mix asphalt (WMA) additives and reclaimed asphalt pavement (RAP)

Yousefi Afshar; Behnood Ali; Nowruzi Ata; Haghshenas Hamzeh

摘要

Global warming and reduced available energy resources have provided strong incentives to find alternative materials and technologies for the construction of pavements. Technologies such as asphalt recycling or warm mix asphalt (WMA) can provide several economic and environmental benefits. This research was initiated to investigate the mechanical and durability performance of WMA mixtures containing 0% and 50% reclaimed asphalt pavement (RAP) made with different types of WMA additives including Sasobit (R), Kaowax (R), Zeolite (R), and PAWMA (R). For this purpose, various mechanical tests including dynamic creep at 54.4 degrees C, resilient modulus at three temperatures of 5 degrees C, 25 degrees C, and 40 degrees C, indirect tensile strength (ITS) at 25 degrees C, and semi-circular bending (SCB) fracture at about 25 degrees C were conducted. The durability performance of the mixtures was evaluated by calculating the tensile strength ratio (TSR) to investigate the moisture susceptibility of the mixtures. The findings indicated that the mechanical performance of the mixtures depends on the type of WMA additive. Among all the WMA additives evaluated in this study, only PAWMA (R) decreased the resistance of asphalt mixture to moisture damage. Although the incorporation of RAP material into asphalt mixtures decreases the flexibility and cracking resistance of the mixtures, it leads to a significant improvement in resisting the damages associated with rutting. The mixture containing RAP and Kaowax (R) resulted in the highest flow number value, while the HMA mixture containing Zeolite (R) resulted in the lowest flow number value. Moreover, the incorporation of RAP material into asphalt mixtures was found to enhance the moisture damage resistance, the asphalt mixtures containing RAP and PAWMA (R) showed the highest resistance to moisture damage among all the mixtures studied in this research. In addition, the asphalt mixtures containing RAP and made with Sasobit (R) or PAWMA (R) showed the highest resilient modulus and cracking resistance among all the mixtures, respectively. (C) 2020 Elsevier Ltd. All rights reserved.

机译：全球变暖和减少的可用能源资源提供了强烈的激励措施，以寻找替代材料和技术的施工。沥青回收或温热沥青（WMA）等技术可以提供多种经济和环境效益。启动该研究以研究含有0％和50％回收沥青路面（RAP）的WMA混合物的机械和耐久性性能，所述沥青沥青路面（RAP）包括不同类型的WMA添加剂，包括Sasobit（R），Kaowax（R），沸石（R）和Pawma（r）。为此目的，各种机械测试，包括54.4℃的动态蠕变，在5℃，25℃和40摄氏度的三个温度下，间接拉伸强度（其）处于25摄氏度，半圆形弯曲（SCB）进行约25℃的骨折。通过计算抗拉强度比（TSR）来研究混合物的水分敏感性来评价混合物的耐久性性能。调查结果表明，混合物的机械性能取决于WMA添加剂的类型。在本研究中评估的所有WMA添加剂中，只有PAWMA（R）降低了沥青混合物的抗性与水分损伤。尽管将RAP材料掺入沥青混合物中的抗性和混合物的抗性降低，但它导致抵抗与车辙相关的损坏的显着改善。含有RAP和kaowax（R）的混合物导致最高的流量值，而含有沸石（R）的HMA混合物导致流量最低值。此外，发现RAP材料掺入沥青混合物中以增强水分损伤，含有RAP和PAWMA（R）的沥青混合物显示出本研究中研究的所有混合物中的水分损伤的最高抵抗力。此外，含有RAP和用梭菌（R）或PAWMA（R）制成的沥青混合物在所有混合物中分别显示出最高的弹性模量和裂解性。（c）2020 elestvier有限公司保留所有权利。

Performance evaluation of asphalt mixtures containing warm mix asphalt (WMA) additives and reclaimed asphalt pavement (RAP)

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