Article
Polymer Science
Abdulrahman Hamid, Hassan Baaj, Mohab El-Hakim
Summary: Modifying asphalt binders is an effective method to improve the performance of asphalt pavement, and this study evaluated the effects of temperature, stresses, polymer type, and modification rate on the rutting behavior of modified asphalt binders. Through laboratory testing, the rheological properties of the binders and the rutting resistance of asphalt mixtures were investigated. The findings provide insights into the best modifiers and mixtures for different temperature conditions.
Article
Chemistry, Physical
Jingyao Yang, Gang Xu, Peipei Kong, Xianhua Chen
Summary: Research on desulfurized crumb rubber (CR)/styrene-butadiene-styrene (SBS) modified asphalt has shown that the combination of desulfurization and the force chemical reactor technique can improve the high-, intermediate-, and low-temperature performance of the asphalt. The use of Burgers' model in simulating creep stages from MSCR tests for CR/SBS composite modified asphalts was found to be appropriate. The optimal preparation process for desulfurized CR/SBS modified asphalt involves 4% SBS, 20% desulfurized rubber, and a force chemical reactor time of 45 min.
Article
Construction & Building Technology
Yujie Tang, Zhen Fu, Feng Ma, Jun Liu, Qiyu Sun, Chen Li
Summary: This study investigated the effects of CNTs on the high-temperature rheological and chemical properties of SBS modified asphalt. Molecular dynamics simulation, DSR, BBR, and FTIR spectrometer were used to assess the molecular motion state, rheological properties, and chemical properties of CNTs and SBS composite modified asphalt binders under various aging conditions. The findings demonstrated that CNTs could absorb components in SBS-modified asphalt, restrict the movement and diffusion of SBS and asphalt molecules, and improve the stability of SBS-modified asphalt. Additionally, the addition of CNTs could enhance the rheological properties, temperature susceptibility, and rutting resistance of SBS-modified asphalt at high temperatures.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2023)
Article
Construction & Building Technology
Zhilong Cao, Jianying Yu, Juan Yi, Guoqiang Sun, Song Xu, Xiaobin Han
Summary: This paper explores the effective recycling of waste SBS modified asphalt mixture. The results show that reactive rejuvenation method significantly enhances the stability and resistance of ASMBM, and improves its cracking resistance. Additionally, reactive rejuvenation improves the fatigue life and water stability of the mixture. The road performances of reactive rejuvenated ASMBM continue to improve in the early stage after rejuvenation.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Green & Sustainable Science & Technology
Jiangcai Chen, Zhenfu Huang, Haipeng Wang, Zhenxing Yang, Tao Zhang
Summary: Styrene-butadiene-styrene (SBS) is widely used as an asphalt modifier, but high-SBS-concentration high-viscosity modified asphalts (HVMA) have poor flow and storage instability. To improve their performance, a nano-based high-viscosity composite modified asphalt with excellent performance was developed. Carbon nanotubes (CNTs) were modified and combined with two polymers to better disperse them in the modified asphalt. The resulting CNTs/SBS-HVMA showed good storage stability, workability, high-temperature resistance, aging resistance, and deformation resistance.
Article
Materials Science, Composites
Yongjun Meng, Pengfei Qin, Muhammad Yaseen, Jing Chen, Tianyi Yan, Weixing Gan, Jiechao Lei, Jing Li
Summary: This study resolves the poor high-temperature performance and lower dissolution of styrene-butadiene-styrene (SBS) modified asphalt and soybean bio-asphalt (SBA) by using tannic acid modified bamboo fiber. The results showed that the addition of bamboo fiber and waste soybean oil-extracted bio-asphalt can significantly enhance the rheological properties of the modified asphalt.
POLYMER COMPOSITES
(2022)
Article
Construction & Building Technology
Aiqin Shen, Hansong Wu, Yinchuan Guo, Xiaolong Yang, Ziming He, Yue Li
Summary: LDH enhances the viscosity and resistance to deformation of SBS-modified asphalt, but may reduce its ductility when added in high concentrations. The addition of LDH significantly improves the flame-retardant properties of asphalt.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Construction & Building Technology
Zuzhong Li, Jinhai Zeng, Yuan Li, Zepeng Zhao, Peiliang Cong, Yongchang Wu
Summary: In this study, the micro-structure and rheological properties of five different SBSMA samples were tested and analyzed during the aging process. The results showed that the composition of asphalt had a significant impact on the performance of SBSMA, with higher content of light components leading to better high-temperature stability after short-term aging, and higher content of asphaltene resulting in stronger elastic response after long-term aging. In addition, there were good correlations between the infrared indexes, rheological parameters, and composition content.
MATERIALS AND STRUCTURES
(2022)
Article
Construction & Building Technology
Ning Xu, Hainian Wang, Yu Chen, Miomir Miljkovic, Ponan Feng, Heyang Ding
Summary: This study investigates the feasibility of using a novel SBSC modifier to obtain modified bitumen with acceptable thermal storage stability and enhanced properties. The results show that the addition of the SBSC modifier significantly increases the softening point and ductility of the modified bitumen, while the decrease in penetration is not significant. Furthermore, the rheological properties and thermal storage stability of the modified bitumen are improved. Microscopic examination reveals that the SBSC modifier can be uniformly dispersed in the base bitumen. This research sheds light on the application of the SBSC modifier to bitumen pavements.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Jing Li, Shanshan Wang, Yu Liu, Hongfei Lin, Ruinan Pei, Yaseen Muhammad
Summary: By modifying microwave absorber iron oxide into PDA-HDA-Fe3O4 and compounding it with rubber powder/styrene butadiene styrene modified asphalt, the mechanical properties, high-temperature performance, and self-healing ability of the modified asphalt were significantly improved.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Jasim Nisar, Mohammad Shafi Mir, Vivek
Summary: This study identifies the optimal blending parameters of LDPE/SBS composite modified asphalt binder using an orthogonal experiment. The results show that the composite modified asphalt performs well in high temperature climates and shows improved high temperature properties, resistance towards permanent deformation, and better elastic behavior. The study also highlights the importance of enhancing the application of LDPE in the pavement industry and promoting environmental sustainability.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Physical
Bangwei Wu, Chufan Luo, Zhaohui Pei, Chuangchuang Chen, Ji Xia, Peng Xiao
Summary: Polymer additives have been widely used, but their effects on the durability of asphalt binders have not been thoroughly investigated. Adding polymer modifiers to SBS asphalt binders improves aging resistance, with high viscosity modifier (HVM) showing the best results. Various aging indicators can predict the aging degree of polymer modified asphalt binders.
Article
Construction & Building Technology
Xiaolong Yang, Guiyong Liu, Hongliu Rong, Yongjun Meng, Chunhong Peng, Minqiang Pan, Zhikang Ning, Guangchen Wang
Summary: The mechanical properties of composite modified asphalt and the interaction mechanism of each modifier were investigated. The results showed that PPA and BA can improve the storage stability of SBS modified asphalt, and the composite modified asphalt with lower SBS content still has excellent performance.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Zeyang Chen, Wenke Huang, Kuanghuai Wu, Guihai Nie, Yuqi Zheng, Jianwen Song, Xu Cai, Jianbo Wu, Jiandong Huang
Summary: This study analyzes the aging performance of SBS modified asphalt binder used in fluid mastic asphalt (FMA). Through testing its macro and micro properties, it is found that heating the asphalt binder at ultra-high temperatures can lead to performance degradation, especially in the aging process at 225 degrees Celsius. This is of significance for the construction process of FMA.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Engineering, Chemical
Yun Que, Yefei Wang, Song Xu, Yong Fan
Summary: This study compared different methods for determining the SBS content in aged-modified asphalt and found that the FTIR test exhibited the best accuracy and efficiency for detecting SBS content.
POLYMER ENGINEERING AND SCIENCE
(2022)
Article
Engineering, Multidisciplinary
Sumit Gupta, Hyungsuk (Eric) Kim, Hyonny Kim, Kenneth J. Loh
Summary: This study aimed to develop and validate a noncontact, nondestructive inspection method using planar electrical capacitance tomography for assessing the subsurface condition of carbon fiber-reinforced polymer (CFRP) composite structures. The method successfully detected volumetric changes in electrical permittivity for different objects and detected subsurface defects and delamination in CFRP panels, demonstrating its effectiveness and accuracy.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Yun-An Lin, Yingjun Zhao, Long Wang, Yujin Park, Yi-Jui Yeh, Wei-Hung Chiang, Kenneth J. Loh
Summary: The study has developed a flexible, self-adhering, fabric-based wearable sensor for measuring skin strains and human motions, with stable sensing performance and effectiveness confirmed through stability and human subject tests.
ADVANCED MATERIALS TECHNOLOGIES
(2021)
Article
Instruments & Instrumentation
Han-Joo Lee, Kenneth J. Loh
Summary: This study addresses the issue of heat loss in soft robotic systems by developing a system that can actively control heat loss to enhance both actuation and cooling. The use of double-walled structures and a thermoelectric device has shown improved performance in underwater operation, providing enhanced reversible actuation.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Construction & Building Technology
Sumit Gupta, Yun-An Lin, Han-Joo Lee, Jeff Buscheck, Rongzong Wu, Jerome P. Lynch, Navneet Garg, Kenneth J. Loh
Summary: This study successfully validated the feasibility of large-scale application of self-sensing concrete in airport runway pavements and characterized spatially distributed damage using electrical resistance tomography (ERT). The results demonstrated that self-sensing concrete can accurately identify the severity, location, and patterns of cracks, as well as detect subsurface damage features before cracks become visible on the surface.
CEMENT & CONCRETE COMPOSITES
(2021)
Article
Engineering, Multidisciplinary
Morgan L. Funderburk, Yujin Park, Anton Netchaev, Kenneth J. Loh
Summary: This study validated the functionality of flow-excited scour sensors that can operate during extreme events. The piezo-rods were driven into soil to collect scour data and monitor their own structural response. By establishing a velocity-frequency relationship, the accuracy of length prediction of the piezo-rod was improved.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Esteban Guerra-Bravo, Han-Joo Lee, Arturo Baltazar, Kenneth J. Loh
Summary: In this study, a mechanical vibrational analysis was conducted to control the atomization mass transfer rate of an ultrasonic atomizer. The effects of the micro-apertures shape and coupling of the metallic thin plate with a piezoelectric ring during vibration were numerically studied and compared with theoretical and experimental results. Good correlations between predicted and experimental data in terms of resonant frequencies and atomization rates were observed.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Biomedical
Yingjun Zhao Dubuc, Brittney Mazzone, Adam J. Yoder, Elizabeth Russell Esposito, Tae Hoon Kang, Kenneth J. Loh, Shawn Farrokhi
Summary: This review discusses the use of ankle brace systems for ankle sprains, evaluates the clinical benefits and limitations of different types of braces, and introduces new design concepts. It also explores the latest advancements in biomechanical simulation, multifunctional material fabrication, and wearable injury surveillance devices, and provides suggestions for future brace design.
EXPERT REVIEW OF MEDICAL DEVICES
(2022)
Article
Chemistry, Analytical
Sijia Li, Yening Shu, Yun-An Lin, Yingjun Zhao, Yi-Jui Yeh, Wei-Hung Chiang, Kenneth J. Loh
Summary: This study aims to design a strain-sensitive paint for structural monitoring. Carbon nanotubes (CNT) are dispersed in paint through high-speed shear mixing, and paint thinner is used to adjust the viscosity and nanomaterial concentration. The paint is spray-coated onto patterned substrates to form Sensing Meshes, and an electrical resistance tomography (ERT) measurement strategy and algorithm are used to reconstruct the conductivity distribution of the Sensing Meshes, enabling distributed strain monitoring.
Article
Instruments & Instrumentation
Morgan L. Funderburk, Jamie Tran, Michael D. Todd, Anton Netchaev, Kenneth J. Loh
Summary: Local scour is becoming a major cause of bridge failure worldwide, with the effects of climate change increasing the vulnerability of bridges. This study explores the use of ultrasonic time-domain reflectometry for continuous monitoring of soil interface in order to detect scour. The results show that the Lamb wave scour sensor is capable of reliably detecting soil interfaces at regular intervals.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Han-Joo Lee, Julie A. Mancini, Ishan Joshipura, Christopher M. Spadaccini, Kenneth J. Loh
Summary: Waveguides designed by shape optimization are more suitable for additive manufacturing, and can control the propagation of ultrasonic waves and be used for signal transmission or selective heating.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Chemistry, Analytical
Yun-An Lin, Yash Mhaskar, Amy Silder, Pinata H. Sessoms, John J. Fraser, Kenneth J. Loh
Summary: Insight into and measurements of muscle contraction during movement have led to the development and validation of a self-adhesive, elastic fabric, nanocomposite, skin-strain sensor for human movement monitoring. The sensor accurately measures skin-strains during functional movements, reflecting different degrees of muscle engagement.
Article
Chemistry, Analytical
Yening Shu, Saptarshi Mukherjee, Tammy Chang, Abigail Gilmore, Joseph W. Tringe, David M. Stobbe, Kenneth J. Loh
Summary: In this study, a current injection-based method called Electrical Resistance Tomography (ERT) is proposed for detecting damaged struts in conductive cellular lattice structures. An improved conductivity reconstruction algorithm is also introduced to overcome the limitations of conventional ERT and improve imaging and localization accuracy.
Article
Computer Science, Interdisciplinary Applications
Said Quqa, Luca Landi, Kenneth J. Loh
Summary: Sensing skins and electrical impedance tomography are cost-effective alternative methods for distributed sensing in civil structures, but their performance declines with aging of the sensing film. This paper proposes a novel approach using electrical resistance tomography and deep neural networks for crack identification in nanocomposite paint sprayed on structural components. The method incorporates crack annotations collected during visual inspections and utilizes transfer learning to improve crack identification performance. The results demonstrate that the proposed method outperforms traditional approaches for crack localization in complex damage patterns.
COMPUTER-AIDED CIVIL AND INFRASTRUCTURE ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Said Quqa, Sijia Li, Yening Shu, Luca Landi, Kenneth J. Loh
Summary: This paper explores the efficacy of supervised machine learning in solving the inverse electrical impedance tomography problem and reconstructing the conductivity distribution of a piezoresistive sensing film. A deep neural network is used to reconstruct the conductivity distribution within the painted area by using voltage measurements collected at sparse boundary locations. The paper presents a new approach to test the suitability of synthetic datasets built using a finite element model of the sensing film. Promising results are obtained compared to conventional methods.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Morgan L. Funderburk, Kenneth J. Loh
Summary: This paper introduces a flow-driven technology for monitoring scour and improves the design of the sensor to enhance its sensitivity and frequency output. The research results show that accuracy of scour monitoring can be improved by introducing more frequency features and increasing the mass ratio.
IEEE SENSORS LETTERS
(2022)
