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Chemical, rheological and aging characteristic properties of Xinjiang rock asphalt-modified bitumen

CONSTRUCTION AND BUILDING MATERIALS 2020年第0期240卷 117908-000页

作者： Cheng, Long Yu, Jiang Zhao, Qun Wu, Jinshi Zhang, Lei Southeast Univ Intelligent Transportat Syst Res Ctr Nanjing 210096 Peoples R China Xinjiang Univ Civil Construct Coll Urumqi 830047 Xinjiang Peoples R China

Recently, rock asphalt has been widely used to modify bitumen binder;however, limited studies have been conducted to comprehensively evaluate the chemical, rheological and aging characteristics of bitumen modified with Xinjiang rock asphalt (XRA) from China. In this study, base bitumen (K64) was added with 0%, 8%, 12%, 16% and 20% XRA by mass respectively to prepare different modified binder, and rolling thin-film oven (RTFO) and pressure aging vessel (PAV) tests were performed to simulate short-term and long-term aging, respectively. The evolution of the chemical and rheological characteristics of the binders before and after aging were monitored with Fourier transform infrared (FTIR), rotational viscosity, dynamic shear oscillatory, frequency sweep, multiple stress creep recovery (MSCR) and bending beam rheometer (BBR) tests. Furthermore, several empirical indexes were tracked with softening point, ductility and penetration tests. The FTIR results indicated that with the introduction of the XRA modifier, the carbonyl functional group of the binders was reduced after aging, and the carbonyl index was more stable than the sulfoxide index to characterize the aging extent of the XRA-modified bitumen binders. Moreover, the rheological and empirical indexes suggested that the XRA could reduce excessive plastic deformations at high temperatures and broaden the final performance grade (PG) of the binder, while a high XRA addition ratio could compromise the low-temperature stress relaxation properties of the bitumen. Additionally, principal component analysis (PCA) suggested that ten parameters employed in this paper (such as stiffness, PG grade, percent recovery and etc.) have similarity and can be explained by two variables: PG grade and carbonyl index. Generally, based on the above evaluations and selection sort algorithm, 12% XRA was the optimum dose for modifying K64 to exhibit the best performance. (C) 2019 Elsevier Ltd. All rights reserved.

关键词： XRA FTIR Rheological master curve Aging indexes PAC selection sort algorithm

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Several incomplete sort algorithms for getting the median value

International Journal of Digital Content Technology and its ...

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International Journal of Digital Content Technology and its Applications 2010年第8期4卷 193-198页

作者： Fuguo, Dong School of computer science and technology Shandong Institute of Business and Technology Shandong YanTai China

To quickly get the median value of any given sequence is very important in many research fields. Some popular sort algorithms are discussed in this paper. selection sort algorithm and bubble sort algorithm are redesigned as incomplete sort algorithms to quickly give the median value of randomly given sequence. In the new algorithms, only parts of the items in sequence need to be sorted to give the median value, then many data comparison and movement operation are reduced, and the speed of getting median value can be improved greatly. Besides, insertion sort algorithm and merge sort algorithm are analyzed thoroughly and found not suitable to be redesigned as incomplete sort algorithms for this purpose. At last, lots of experiments are done to compare the performance of incomplete selection sort algorithm and incomplete bubble sort algorithm. Experiment results and algorithm analysis show that incomplete selection sort algorithm perform very well in case of both short sequence and long sequence.

关键词： Bubble sort algorithm Incomplete sort algorithm Median value selection sort algorithm

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