Article
Engineering, Civil
Q. Hu, Y. J. Shen, H. P. Zhu, H. F. Lam, M. O. Adeagbo
Summary: This paper discusses the feasibility of using Bayesian approach and measured vibration of a railway slab track system to detect void in the CA mortar layer. Results show that the proposed methodology can accurately identify the stiffness distribution of the CA mortar layer with acceptable posterior uncertainties, even with a single accelerometer.
ENGINEERING STRUCTURES
(2021)
Article
Construction & Building Technology
Cong Ma, Xiaoming Zhao, Jinyan Shi, Jing Tao, Haijun Zhou, Biqin Dong, Yanliang Du
Summary: A novel magnesium phosphate cement-based CEA (MEA) mortar was prepared and its properties were systematically investigated. The MEA mortar exhibited a setting time within 30 min and a compressive strength of 15-45 MPa. Increasing the emulsified asphalt to cement ratio reduced the strength, water resistance, and frost resistance of the MEA mortars, while adding emulsified asphalt with low water content improved the setting time and failure strain compared to plain magnesium phosphate cement. This study provides an alternative material for track slab maintenance.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Huasheng Zhu, Xiaohui Zeng, Xuli Lan, Hao Song, Guangcheng Long, Youjun Xie
Summary: This study found that high temperatures significantly increase the creep degree and rate of CA mortar, resulting in changes in its mechanical properties and microstructure.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2022)
Review
Construction & Building Technology
Shunjun Jiang, Jiusu Li, Zhu Zhang, Hongshan Wu, Guanlan Liu
Summary: CEAM is an essential component in the ballastless slab track system, with various important functions. The mass ratio of asphalt to cement has the most significant influence on CEAM performance. Future research should focus on sustainability and further analyze the interaction mechanism between materials from a microscopic perspective.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Materials Science, Ceramics
Cong Ma, Ya Wu, Jinyan Shi, Shenyou Song, Fen Xia, Jian Liu, Haijun Zhou, Biqin Dong, Yanliang Du
Summary: In order to improve the efficiency of repairing asphalt pavements, a rapid-hardening magnesium-based cement emulsified asphalt (MCEA) mortar was developed. The effect of mix parameters on the properties of MCEA sample was investigated, and the results showed that the initial setting time of MCEA paste is within 30 min and the fluidity is 60-180 mm. The compressive and flexural strengths of plain magnesium phosphate cement mortar reach 46.45 and 7.7 MPa, respectively, and they decrease with the increase of A/C, W/C, and M/P ratios.
CERAMICS INTERNATIONAL
(2023)
Article
Construction & Building Technology
Jie Wang, Yongchun Qin, Jian Xu, Rong Chang, Liping Liu
Summary: Through AFM and DSR testing, the microscale properties of the interface between cement emulsified asphalt and aged asphalt in the composite system were studied, revealing that the gradient of microscale mechanical properties can quantify the interface thickness and the cement content affects the fatigue performance.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2022)
Article
Mechanics
Shima Najjar, Abolfazl Mohammadzadeh Moghaddam, Ali Sahaf
Summary: This study investigated the fracture properties of Cement Emulsified Asphalt Mortar (CEAM) in mixed mode I&II fractures, optimizing fracture energy through experiments and mixture design. Cement and asphalt were identified as key factors affecting fracture energy and optimal mix design, with an increase in asphalt emulsion-to-cement ratio leading to decreased maximum carried force.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Construction & Building Technology
Zhongli Wang, Tian Xia, Jianhui Xu, Youbing Li, Min Wang
Summary: This study investigated the effect of polyurethane (PU) addition on the dynamic mechanical properties of cement emulsified asphalt (CA) used in railway construction. The results showed that 5% and 10% PU loading could enhance both the dynamic stiffness and damping capacity of CA, while the variation of 0-20% PU loading resulted in a nonmonotonic change in dynamic stiffness. The fatigue life of CA was prolonged by the addition of PU, with the most prominent effect observed at 10% PU loading. Scanning electron microscope (SEM) and Fourier Transform Infrared Spectrometer (FTIR) analysis revealed a core-shell structure composed of anionic PU covering the surface of cationic emulsified asphalt, indicating the important role of the inorganic-organic transition layer in enhancing the dynamic mechanical properties of CA.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Green & Sustainable Science & Technology
Shanshan Jin, Weinan Zhan, Yang Zhang
Summary: Cement emulsified asphalt mortar (CA) is widely used as the cushion of two types of ballastless track in high-speed railways. The lack of durability of CA mortar has severely affected the quality of high-speed railways. This research reveals the evolution law of microstructures of CA mortar and proposes a fractal model of pore volume, providing a basis for improving its durability.
Article
Multidisciplinary Sciences
Qingyuan Xu, Shengwei Sun, Yi Xu, Changlin Hu, Wei Chen, Lei Xu
Summary: This study investigates the dynamic responses of a high-speed train running on a ballastless track under the temperature gradient. A dynamic model is developed and the results show that the proportion of initial force and stress caused by the temperature gradient differs for different calculation items. The maximum dynamic responses are not uniform along the track and the maximum accelerations occur when the fifth or sixth wheel passes the measuring point.
SCIENTIFIC REPORTS
(2022)
Article
Construction & Building Technology
Cong Ma, Jiahua Peng, Zhigang Guo, Jinyan Shi, Fang Yu, Haijun Zhou, Biqin Dong, Yanliang Du
Summary: To meet the requirements of compatibility and timeliness of repair materials for asphalt pavement, a rapid-hardening magnesia-based cement emulsified asphalt mortar (MCAM) is prepared. The stability of MCAM is affected by high temperature or high-temperature water bath treatment, and MCAM prepared from emulsified asphalt with high softening point and low water content has better high-temperature stability. The asphalt-cement (A/C) ratio in MCAM-repaired asphalt mixture influences its dynamic stability, stiffness modulus, failure strain, and bonding strength.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2023)
Article
Polymer Science
Sang-Yum Lee, Young-Man Yun, Tri Ho Minh Le
Summary: This research demonstrates the quantitative impact of incorporating epoxy resin and crumb rubber powder into cement asphalt mortar for railway track stabilization. The modified mortar exhibits improved flowability, mixing stability, and compressive strength compared to traditional formulations. It also showcases robust resistance to environmental challenges, including acid and freeze-thaw conditions, and effectively prevents settlement in a mock-up test simulating real-world conditions.
Article
Engineering, Mechanical
Shima Najjar, Abolfazl Mohammadzadeh Moghaddam, Ali Sahaf, M. R. M. Aliha
Summary: The study investigated the impact of freeze and thaw cycles on the fracture behavior of Cement Emulsified Asphalt Mortar (CEAM). The results showed that freeze and thaw cycles reduced the fracture energy of CEAM in pure tensile, pure shear, and mixed tensile-shear modes. The effect of freeze and thaw cycles on fracture properties varied with different mix designs.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Construction & Building Technology
Shima Najjar, Abolfazl Mohammadzadeh Moghaddam, Ali Sahaf, M. R. M. Aliha
Summary: This study investigated the fatigue life of Cement Emulsified Asphalt Mortar (CEAM) under mixed-mode I/II loadings at an intermediate temperature. The results showed that increasing the cement content and asphalt-to-cement ratio improved the fatigue life. The CEAM exhibited a longer fatigue life in the pure shear mode compared to pure tensile mode. The difference in fatigue life between mode I and II increased with higher cement content and loading frequency.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Chemistry, Physical
Siyue Zhu, Zirui Xu, Xiantao Qin, Menghui Liao
Summary: The study found that the addition of fibers significantly improved the comprehensive properties of cement-emulsified asphalt mixtures, with polyester fibers and brucite fibers showing different enhancement effects. Fibers contributed to the high-temperature stability and fatigue loading cycles of CEAM, while also reducing sensitivity to changes in stress levels. Both mixtures met the requirements for hot mixed asphalt mixtures, with slight differences in durability between the two fiber types.
Article
Construction & Building Technology
Xiang Hu, Caijun Shi, Qiang Yuan, Jian Zhang, Geert De Schutter
CEMENT & CONCRETE COMPOSITES
(2020)
Article
Construction & Building Technology
Yu Liu, Caijun Shi, Qiang Yuan, Xiaopeng An, Lingli Zhu, Bin Wu
CEMENT & CONCRETE COMPOSITES
(2020)
Article
Construction & Building Technology
Xiang Hu, Caijun Shi, Qian Yuan, Geert de Schutter
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Review
Construction & Building Technology
Yu Liu, Caijun Shi, Qiang Yuan, Xiaopeng An, Dengwu Jiao, Lingli Zhu, Kamal Henri Khayat
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Article
Construction & Building Technology
Shenghao Zuo, Jia Xiao, Qiang Yuan
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Article
Construction & Building Technology
Tingjie Huang, Qiang Yuan, Fuqiang He, Youjun Xie
CEMENT AND CONCRETE RESEARCH
(2020)
Article
Materials Science, Ceramics
Tingjie Huang, Qiang Yuan, Shenghao Zuo, Caijun Shi
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2020)
Article
Materials Science, Ceramics
Tingjie Huang, Chao Yu, Qiang Yuan, Zanqun Liu, Dehua Deng
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2020)
Review
Construction & Building Technology
Junquan Li, Zemei Wu, Caijun Shi, Qiang Yuan, Zuhua Zhang
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Review
Construction & Building Technology
Hammad Ahmed Shah, Qiang Yuan, Shenghao Zuo
Summary: This study emphasizes the importance of the air-void system in fresh and hardened concretes on different properties, and discusses in detail the factors affecting the parameters of the air-void system.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Yun Gao, Kai Wu, Qiang Yuan
Summary: This study discusses the limited fractal behavior of cement paste and introduces two analysis modules: ordinary fractal and multiscale fractal. By simulating and comparing pore structures, it is found that multiscale fractal provides a more accurate way to describe the limited fractal behavior in cement paste.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Wei Hou, Zanqun Liu, Ju Huang, Qiang Yuan, Fuqiang He
Summary: The study investigated the use of sodium carbonate extraction (SCE) method to determine sulfate content in cement, revealing its suitability for CSA cement. Analysis showed that the failure of the SCE method in Portland cement system was due to the absorption of sulfate ions by C-S-H gels.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Green & Sustainable Science & Technology
Zhi-hai He, Ying Yang, Qiang Yuan, Jin-yan Shi, Bao-ju Liu, Chao-feng Liang, Shi-gui Du
Summary: This study investigates the impact of modified water treatment sludge on the composition and performance of Portland cement composites. It was found that when 10% of the cement was replaced by modified sludge, higher compressive strength was achieved. The modified sludge exhibits pozzolanic activity, improves the compactness of the microstructure, and reduces drying shrinkage.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Biochemistry & Molecular Biology
Yang Liu, Lou Chen, Keren Zheng, Qiang Yuan
Summary: Three strategies were adopted to optimize the packing density and mechanical property of the reverse filling system, with adjustments made to the D50 ratio to improve density and the addition of silica fume and steel fiber for comparison. The incorporation of steel fiber showed a more significant increase in packing density compared to silica fume. The optimized reverse filling system demonstrated lower environmental impact and higher cement use efficiency than most reported ultra-high performance concrete (UHPC)/ ultra-high performance fiber-reinforced concrete (UHPFRC) samples.
Article
Construction & Building Technology
Zanqun Liu, Jiahui Zhu, Qiang Yuan, Cheng Wang, Fengyan Zhang
JOURNAL OF SUSTAINABLE CEMENT-BASED MATERIALS
(2020)
