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Xiaowei Wang,Jiaxing Ren,Xinyu Hu,Xingyu Gu,Ning Li 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.6
The compaction characteristics of porous asphalt (PA) mixtures are significantly different from those of traditional dense-graded asphalt mixtures. Compaction efforts are critical for PA mixtures to exhibit good performance in terms of strength, functionality, and durability. The objective of this study was to determine the optimum number of gyrations for typical PA mixtures compacted using a Superpave gyratory compactor. The compaction characteristics and the influence of seven gyration levels on the indicators of air voids (AV) content, Marshall Stability (MS), multi-directional permeability, stone-on-stone contact, and durability of PA mixture were investigated through laboratory experiments. A multi-directional permeameter was designed to evaluate the multi-directional permeability of PA mixtures, including vertical, horizontal, and combined horizontal-vertical permeability. The AV content, multi-directional permeability decreases with the increasing gyrations. Based on the requirements of each indicator, the minimum and maximum gyrations for each indicator were determined. Balancing the performance of strength, functionality, and durability, the optimum number of gyrations for the PA mixtures was determined to be between 45 and 75 gyrations, which allows for different gyrations depending on the application of the PA mixture. Finally, the requirements of MS, horizontal permeability, and combined horizontal-vertical permeability are recommended for improving the performance of PA mixture.
Min Zhou,Xiaowei Ning 서울대학교 사회발전연구소 2022 Journal of Asian Sociology Vol.51 No.3
This study examines what types of Internet use are related to social capital in today’s China, using data from the 2017 Chinese General Social Survey. It distinguishes the intensity (the time spent on the Internet) and five types (communication, publicity, entertainment, information, and business) of Internet use and investigates their relationships with two distinct types of social capital—network capital and participatory capital that stress interpersonal networks and participation in social organizations, respectively. The intensity of Internet use shows a curvilinear relationship with network capital but displays no relationship with participatory capital. On average, its positive relationship with network capital turns negative after the threshold of 18.6 hours per week. Internet use for communication, publicity, and business is positively related to network capital, and that for publicity and business is positively related to participatory capital. Using the Internet for information and entertainment shows no relationship with either network or participatory capital.