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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.
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How Do the Users Show their Interest on Line?------ Eye Movement and Browsing Behaviour
Xiaowei Shi,Zhi Gu,Daofang Chang,Linping Huang 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.4
Nowadays, increasing number of people prefer to shop online which has become a central part in their daily life. However, this precipitates a need to get knowledge about how people show their interests in the product which may contribute to recommend the right product for them. In this paper, an experiment was conducted in a clothing website which aimed to find out how and when people were interested in certain product in terms of eye movement and browsing behaviour. The results show that for eye movement, there is no direct relationship between pupil diameter and interests, and user’s interests have direct correlativity with blink frequency for some users. Moreover, eye movement can predict the user’s interests, and the accuracy is about 62%; for browsing behaviour, scroll times and display time also has something to do with the user’s interest; as for the relationship between eye movement and interactive behaviour, when scroll times increases, then saccade will increases too, but fixation time will reduce. Therefore, the conclusion can be drawn that when users shop online, they always need to interact with online store, and eye movement and interactive behaviour occurs in a particular pattern. This result could contribute to choose the corresponding parameters for recommendation and avoid using the parameters which can reflect users’ interests in the same degree or choose the one which can reflect users’ interest effectively to greatest extent.
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Yang Sun,Xiaowei Gu,Xiaochuan Xu 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.7
Rainfall infiltration is the main factor of hydraulic erosion and deformation instability of tailings reservoir slope. Through the hydraulic erosion test of tailings reservoir slope based on rainfall, the parameters of slope internal moisture content, runoff sediment concentration, runoff, start time of surface erosion and gully erosion and slope velocity were tested. The slope protection effect of ecological base material of tailings reservoir slope determined in the previous study was evaluated. The results show that the vegetation allocation model combined with grass, shrub and flower is effective in hydraulic erosion protection of tailings reservoir slope. The critical slope range of ecological slope model of tailings reservoir is 37.5° − 42.3° under three kinds of rain intensity. The research results can provide certain theoretical and technical support for the safe operation of tailings reservoir and the development of ecological slope protection theory of tailings reservoir.
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Yaoyao Meng,Hongwen Jing,Qian Yin,Xiaowei Gu 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.11
The cyclic wetting-drying phenomenon is a complicated physical and chemical process. This kind of process will weaken the properties of rock to some extent. Some fundamental physical parameters of sandstone were first tested to study the weakening influence of wetting-drying cycles on the physical characteristics. Then, the water weakening effect on the mechanical and acoustic emission (AE) characteristics of rock on account of wetting-drying cycles was experimentally studied. Laboratory test results showed that when the number of cycles increased from 0 to 25, the density, P-wave velocity, uniaxial compressive strength (UCS), (elastic modulus (E)) and total AE counts of the rock specimens continuously decreased. However, the water absorption would increase as the number of cycles increased. The functional relationships between the total AE counts and the mechanical parameters (UCS and E) of sandstone after each cyclic number were established based on the test results. In addition, the chemical components and microstructure variations of rock undergoing wetting-drying cycles were examined. From the results, it can be concluded that microcrack growth and expansion inside the rocks undergoing wetting-drying cycles are the main reasons for the attenuation of the rock properties. Moreover, with increasing loading rate, the UCS, E and total AE counts of sandstone after each cyclic number would increase.
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A Novel Menthol-Cementing Sampling Technique for Cohesionless Coarse-Grained Fillers
Zhe Li,Zhenguo Zhu,Lulu Liu,Lei Sun,Zhongjiang Wang,Xiaowei Gu 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.2
It is difficult to test the engineering properties of undisturbed cohesionless coarse-grained fillers in the laboratory, especially those with low water contents because most sampling methods disturb the natural structure of the filler. This study proposes a novel sampling method that uses menthol as a temporary cement to obtain samples that are more resistant to disturbance. Liquid menthol infiltrates the interparticle spaces and cements the particles together as it cools, forming a high-strength structure. The samples can then be cut with a cutting ring (for grain sizes ≤ 0.5 mm) or a cutting machine (for grain sizes > 0.5 mm) to prepare the final samples, from which the menthol is removed by heating. To demonstrate the feasibility of the method, a number of laboratory experiments were performed, including sampling tests, confined compressive strength tests, vibration tests, drop tests, and CT scans. The optimal particle temperature for introducing the liquid menthol is 70°C, while 90°C is optimal for removing the cemented menthol. For both cost and anti-disturbance reasons, 20°C is suggested as a suitable storage temperature for menthol-cemented samples. The interspace structure undergoes less change with increases in sample depth and with larger grain sizes. We recommend that the lower two-third of the depth of a menthol-cemented block is used as the final sample for laboratory testing.
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