Abstract: Studying the influence of reclaimed asphalt pavement (RAP) on the composition and structural characteristics of mixtures can provide theoretical support for their application in pavement structure layer and material parameter design. This paper proposed a method for identifying the meso-structure of cold recycled mixtures, both new and old aggregates, based on the X-ray CT and image processing technology. The diffe-rences in the meso-structure characteristics of RAP, old aggregates, and new aggregates were analyzed, and the effects of RAP on the meso-structure characteristics of the cement-stabilized RAP materials were studied. The results demonstrate that the proposed meso-structure recognition method can accurately identify the void, mortar, new aggregate, and old aggregate in the section image of cement-stabilized RAP material and completely retain the original outline, size, and shape information of new and old aggregates. Compared with the new aggregate, the old aggregate has a higher flat ratio and angular coefficient. Further, several micro air voids and cracks are present in RAP-granular. The addition of RAP increases the number of micro air voids (volume less than 0.01 mm3) and large voids (volume greater than 100 mm3) in the recycled mixture, resulting in the reduction of material compactness; further, the asphalt mortar content of the material increases, the average mortar film thickness of the recycled mixture improves, and the internal force conduction of the mixture skeleton becomes more uniform. Increasing the proportion of RAP materials stabilized with cement can reduce the average void volume and increase the average mortar film thickness, thereby improving the skeleton filling status of the recycled mixture.
1 Xiao F, Yao S, Wang J, et al. Construction and Building Materials, 2018, 180, 579. 2 Antunes V, Freire A C, Neves J. Construction and Building Materials, 2019, 211, 453. 3 Zeng S F, Xu J P. Journal of Highway and Transportation Research and Development, 2007(3), 39 (in Chinese). 曾石发, 徐江萍. 公路交通科技, 2007(3), 39. 4 Luo K. Study on road performance about cement stabilization crushed-stones mixed with reclaimed asphalt pavement. Master’s Thesis, Changsha University of Science & Technology, China, 2017 (in Chinese). 罗坤. 掺废旧沥青混合料水泥稳定碎石路用性能研究. 硕士学位论文, 长沙理工大学, 2017. 5 Puppala A J, Hoyos L R, Potturi A K. Journal of Materials in Civil Engineering, 2011, 23(7), 990. 6 Mokwa R L, Peebles C S, Robinson E. Pavement Mechanics and Performance, 2006, 1, 247. 7 Ji X, Jiang Y, Liu Y. Materials and Structures, 2016, 49(6), 2257. 8 Ren J, Wang S, Zang G. Construction and Building Materials, 2020, 244, 118329. 9 Liu L Z. The quality control research of RAP material mixing plant thermal regeneration mixes. Master’s Thesis, Chongqing Jiaotong University, China, 2013 (in Chinese). 刘立志. RAP材料厂拌热再生混合料质量控制研究. 硕士学位论文, 重庆交通大学, 2017. 10 Liu T, Ming T Z, Hu G W. Applied Mechanics and Materials, 2012, 204-208, 1730. 11 Ma J Y. Research on the application of cold reclaimed old asphalt pavement material in the base. Master’s Thesis, Chang’an University, China, 2005 (in Chinese). 马君毅. 冷再生旧沥青路面材料在基层中的应用研究. 硕士学位论文, 长安大学, 2005. 12 Ren J, Wang S, Zang G. Construction and Building Materials, 2020, 244, 118329. 13 Brown A V. Transportation Research Record, 2007, 2026(1), 47. 14 Ma S L, Wang C X, Wang P F, et al. Northeastern Highway, 2003, 26(4), 37 (in Chinese). 马松林, 王彩霞, 王鹏飞, 等. 东北公路, 2003, 26(4), 37. 15 Lu H, Peterson K, Chernoloz O. International Journal of Pavement Engineering, 2018, 19(2), 109. 16 Huang W K, Zhang X N. Journal of Harbin Institute of Technology, 2016, 48(3), 125 (in Chinese). 黄文柯, 张肖宁. 哈尔滨工业大学学报, 2016, 48(3), 125. 17 Ma J Y. Meso-structure and stress strain transfer mechanism of skeleton filling system of asphalt mixture. Ph. D. Thesis, Harbin Institute of Technology, China, 2005 (in Chinese). 邢超. 沥青混合料骨架填充体系细观结构及应力应变传递机制研究. 博士学位论文, 哈尔滨工业大学, 2018. 18 Tan Y Q, Xing C, Ren J D, et al. China Journal of Highway and Transport, 2017, 30(7), 1 (in Chinese). 谭忆秋, 邢超, 任俊达, 等. 中国公路学报, 2017, 30(7), 1. 19 Tan Y Q, Xing C, Zhang L, et al. China Journal of Highway and Transport, 2016, 29(4), 8 (in Chinese). 谭忆秋, 邢超, 张磊, 等. 中国公路学报, 2016, 29(4), 8. 20 Liu J. Research on compression resilient modulus and meso-skeleton cha-racteristics of cement stabilized crushed rock material. Master’s Thesis, South China University of Technology, China, 2019 (in Chinese). 刘健. 水泥稳定碎石抗压回弹模量及其细观骨架特征研究. 硕士学位论文, 华南理工大学, 2019. 21 Li Z, Liu J H. Journal of Wuhan University of Technology, 2011, 33(6), 50 (in Chinese). 李智, 刘佳辉. 武汉理工大学学报, 2011, 33(6), 50. 22 Wang F, Xiao Y, Cui P D. Materials Reports, 2022, 36(17), 1 (in Chinese). 王凤, 肖月, 崔培德, 等. 材料导报, 2022, 36(17), 1. 23 Gao L. Cracking behavior and fracture mechanism of cold recycled mixes with emulsion. Ph. D. Thesis, Southeast University, China, 2016 (in Chinese). 高磊. 乳化沥青冷再生混合料的裂纹发展行为及抗裂机理研究. 博士学位论文, 东南大学, 2016. 24 Zhao Z J. Study on the evaluation method of coarse aggregate angularity and its influence on the road performance of asphalt mixture. Master’s Thesis, Chang’an University, China, 2018 (in Chinese). 赵振军. 粗集料棱角性的评价方法及对混合料性能影响研究. 硕士学位论文, 长安大学, 2018. 25 Stolle D F, Guo P, Emery J J. Canadian Journal of Civil Engineering, 2014, 41(6), 493. 26 Shi H. Investigation on seepage behavior in asphalt mixture based on micro-scale air void morphology genic library. Master’s Thesis, Harbin Institute of Technology, China, 2020 (in Chinese). 石浩. 基于空隙形态特征基因组的沥青混合料细观渗流行为研究. 硕士学位论文, 哈尔滨工业大学, 2020. 27 Attia M, Abdelrahman M. Journal of Materials in Civil Engineering, 2010, 22(12), 1260.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2024, Vol. 38 
