Article
Construction & Building Technology
Liyan Shan, Hu Yang, Fuyuan Guo, Zhiwei Li
Summary: This paper proposes a method to obtain internal section images of asphalt mixtures in different fatigue damage stages using X-ray CT scanning technique and indirect tensile fatigue test. The study reveals that the difference in gradation type leads to different fatigue damage patterns and resistance.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Pawel Polaczyk, Yuetan Ma, Zaher Jarrar, Xi Jiang, Rui Xiao, Baoshan Huang
Summary: The internal structure of asphalt mixture is crucial for its performance, and can be characterized and quantified through image-based analysis. This study used 3D and 2D image analyzing processes to quantify the interlocking properties of asphalt mixture, and the results showed promising nondestructive methods.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Jianan Liu, Zhenjun Wang, Haosen Jing, Tonghuan Zhang, Xiaofeng Wang, Xiaowei Zhou, Xu Xu
Summary: Steel slag asphalt mixture (SSAM) with self-healing technology is designed to improve its road performance. The steel slag exhibits obvious magnetic loss characteristics, and its composition design contributes to a better healing rate. The healing process mainly affects the morphology of voids and reduces the proportion of cracks. By reducing the coordination number and throat number of voids, the material's performance is improved.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
Jiwang Jiang, Zhen Leng, Bin Yang, Guoyang Lu, Zhifei Tan, Meizhao Han, Zejiao Dong
Summary: This study investigates the penetration behavior of surface treatment (ST) emulsions in damaged porous asphalt (PA) using X-ray CT scanning and image analysis. The results show that ST emulsions have a gradient distribution in damaged PA, with a maximum penetration depth of about 20 mm. Among the three ST conditions, the PA specimen treated with the ST emulsion that has the best coating efficiency and thickest coating film exhibits the best performance recovery.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
Xiaolong Li, Junfeng Gao, Hui Du, Jingpeng Jia, Xiaojie Zhao, Tianqing Ling
Summary: This study investigates the relationship between the void characteristics and sound absorption characteristics of an epoxy porous asphalt mixture. The results show a correlation between the void characteristics and sound absorption characteristics, with the sound absorption coefficient exhibiting a bimodal trend with frequency.
Article
Materials Science, Multidisciplinary
Eva Baur, Matteo Hirsch, Esther Amstad
Summary: This study presents a method to introduce controllable open pores into hydrogels while maintaining their mechanical properties. The hydrogels are 3D printable and the pore size can be tuned from nanometers to centimeters. This work allows for size-selective infiltration of different substances at specific locations.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Radiology, Nuclear Medicine & Medical Imaging
Patrizia Kunert, Helmut Schlattl, Sebastian Trinkl, Augusto Giussani, Lea Klein, Martin Janich, Detlef Reichert, Gunnar Brix
Summary: Three-dimensional (3D) printing of individualized anthropomorphic phantoms offers promising possibilities for assessing and optimizing radiation exposures for specific patient groups. This study aimed to reproduce a conventionally produced female chest and breast phantom using a multi-material extrusion-based printer and evaluate its equivalence with respect to image contrasts and absorbed doses in CT examination. The results demonstrated that 3D-printed phantoms are generally equivalent to conventionally manufactured phantoms in terms of image contrasts and absorbed doses, with minor differences observed.
Article
Construction & Building Technology
Dongya Ren, Jie Xu, Shaonan Su, Gangsheng Tian, Xu Chen, Allen Zhang, Changfa Ai
Summary: This study uses 3D X-ray computed tomography technology to analyze the digital images of three typical asphalt mixtures with different porosities, and quantitatively and statistically analyzes several pore structure parameters at a micro level. The results show that as the total pores content increases, the difference between the pore fraction and open pores fraction decreases. The porosity of porous asphalt mixtures is high, but mainly composed of interconnected pores with only a small proportion of closed pores. The coordination number determines the connectivity and thus the porosity of the asphalt mixture, and larger open pore channels lead to larger pore diameters and greater permeability.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Materials Science, Ceramics
Chuyuan Zheng, Jung-Kun Lee, Ian Nettleship
Summary: Processing of binder jet printed refractory ceramics, including SiC, to high density remains a challenge. Polymer Infiltration and Pyrolysis (PIP) has been applied to SiC with large particle sizes and low sinterability, but struggles to reach high density after multiple cycles. X-ray micro-computer tomography (mu CT) revealed the formation of large cracks due to gas pressure build-up and the presence of a large pore network in the interior of all samples even after 8 PIP cycles.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Ho-Jae Lee, Eun-A Seo, Won-Woo Kim, Jun-Mo Yang, Jae-Heum Moon
Summary: This study experimentally analyzed the deformation shape of stacked layers developed using 3D printing technology, investigating the effect of nozzle traveling speed on layer deformation and using X-ray CT analysis to examine the interface and cross-sectional area of layers. The results showed that lower nozzle traveling speeds led to greater deformation, while X-ray CT analysis confirmed that the layers maintained the same cross-sectional area regardless of printing order.
Article
Chemistry, Physical
Xiaoguang Yao, Huiyu Xu, Tao Xu
Summary: The void distributions and interfacial adhesion property significantly affect the cracking resistance of cold recycled mixture (CRM) prepared using waterborne epoxy resin/styrene butadiene rubber latex (WER/SBR) modified emulsified asphalt (EA). The modified emulsified asphalt effectively fills the voids and reduces their content and size. Moreover, the modified emulsified asphalt exhibits strong adhesion and deformation resistance. The failure at the interface between asphalt and fresh aggregate and the cohesive failure of the syncretic interface between asphalt and aged asphalt are the main cracking forms of the CRM specimen.
APPLIED SURFACE SCIENCE
(2022)
Article
Construction & Building Technology
Manu K. Mohan, A. V. Rahul, Jeroen F. Van Stappen, Veerle Cnudde, Geert De Schutter, Kim Van Tittelboom
Summary: This study investigates the porosity and pore structure of 3D printed concrete elements using mercury intrusion porosimetry and X-ray micro-computed tomography. The results show that the interlayer region contains larger and interconnected pores with low tortuosity, which can enhance ion transport. The study compares two different cement systems and finds that the calcium sulfoaluminate-limestone blend has higher pore complexity and tortuosity. X-ray micro-computed tomography is able to characterize both open and closed pores in the printed sample at high resolution. This study provides insights into ion transport and durability performance of printed concrete elements.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Construction & Building Technology
Zhiqiang Cheng, De Zhang, Shengjia Xie, Pawel Polaczyk, Xiaoyang Jia, Tao Wang, Baoshan Huang, Ming Cai
Summary: In this study, a novel lab compaction method combining the effects of vibratory and gyratory compaction was proposed to better simulate the vibration and kneading effect of a steel-wheel roller. X-ray tomography was used to compare the air void distribution of in-situ core samples and laboratory-compacted samples by different compaction methods. The results showed that the combination of vibratory and gyratory compaction methods had a comparable air void distribution and compaction effect to the in-situ core samples.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Li Hengzhen, Xu Huining, Yang Xusheng, Tan Yiqiu
Summary: This study describes the freeze-thaw damage evolution of asphalt mixtures in different water environments using image information entropy, showing that liquid water significantly affects the damage.
ROAD MATERIALS AND PAVEMENT DESIGN
(2022)
Article
Construction & Building Technology
Changli Li, Yange Li, Zheng Han, Yinfei Du, Mohammed Ameen Mohammed, Weidong Wang, Jianling Huang
Summary: The three-dimensional reconstruction of asphalt mixture using X-ray computed tomography (CT) images helps establish the correlation between its mesoscopic structure and macroscopic properties. This paper proposes a local threshold based and Monte-Carlo incorporated segmentation method to effectively identify the multiphase components and investigate the spatial variation of different components in the asphalt mixture.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Ignacio Perez, B. Gomez-Meijide, Ana R. Pasandin, Alvaro Garcia, Gordon Airey
Summary: In this study, cold in-place recycling mix with steel fibers was heated by electromagnetic induction to accelerate curing process and improve competitiveness. The results showed significant improvements in Marshall stability, flow after compaction, and strength recovery rate in healing tests after heating.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2021)
Article
Construction & Building Technology
Ahmet Munir Ozdemir, Mehmet Yilmaz, Erkut Yalcin, B. Vural Kok, Jose Norambuena-Contreras, Alvaro Garcia
Summary: This study evaluated the effects of capsules containing waste vegetable oil (WVO) and waste mineral oil (WMO) on the mechanical properties of hot mix asphalt (HMA), finding that an increase in capsule content led to decreased rigidity and strength against permanent deformation and fatigue in asphalt mixtures.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Engineering, Chemical
A. Garcia-Hernandez, L. Wan, S. Dopazo-Hilario
Summary: This paper introduces an algorithm for creating realistic virtual asphalt concretes by predicting air voids and aggregate skeleton to simulate laboratory-prepared asphalt. By considering key parameters affecting compaction and developing an equation based on the Weibull function, the algorithm's compaction requirements can be predicted.
Article
Construction & Building Technology
Yuan Jiang, Shu Liu, Bo Li, Jun He, Alvaro Garcia Hernandez
Summary: This study found that particle packing optimization can improve the mechanical properties and workability of recycled aggregate concrete, reduce the number of macro pores, and minimize the number of macro pores in the cement paste and at the interfaces between RCAs and hardened cement paste.
STRUCTURAL CONCRETE
(2022)
Article
Engineering, Biomedical
Yinfeng He, Jeni Luckett, Belen Begines, Jean-Frederic Dubern, Andrew L. Hook, Elisabetta Prina, Felicity R. A. J. Rose, Christopher J. Tuck, Richard J. M. Hague, Derek J. Irvine, Paul Williams, Morgan R. Alexander, Ricky D. Wildman
Summary: This study shows that customized medical devices can be produced through ink-jet based 3D printing with bacterial biofilm inhibiting formulations. These devices exhibit inhibitory properties against bacterial biofilm growth and non-toxicity to mammalian cells both in vitro and in vivo.
Article
Construction & Building Technology
S. Michot-Roberto, A. Garcia-Hernadnez, S. Dopazo-Hilario, A. Dawson
Summary: In this paper, an impulse-based Discrete Element numerical Method (iDEM) was used to compact virtual aggregates, showing highly comparable results between experimental and simulated properties of aggregate packings. The study demonstrates the effective capacity of the physics toolbox to simulate granular materials.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Asish Malas, Ehab Saleh, Maria del Carmen Gimenez-Lopez, Graham A. Rance, Tim Helps, Majid Taghavi, Jonathan M. Rossiter, Christopher J. Tuck, Ian A. Ashcroft, Ruth D. Goodridge
Summary: This paper demonstrates the use of high viscosity, multi-material inkjet printing to digitally manufacture dielectric elastomers with graphene-based fillers, which significantly improve the dielectric constant and electric-field induced electromechanical contraction of the elastomer.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Engineering, Manufacturing
Rostyslav Dubrovka, Andre Sarker Andy, Ehab Saleh, Robert Christopher Jones, Robert S. Donnan, Christopher J. Tuck
Summary: This paper presents a 3D-printed, 0.3 THz back-to-back smooth-walled horn antenna, which has better performance in detecting the dielectric properties of solvated protein samples.
IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY
(2022)
Article
Engineering, Manufacturing
Jan-Hendrik Groth, Mirco Magnini, Christopher Tuck, Adam Clare
Summary: Current biomimetic designs lack the incorporation of natural variance, while the presented methodology allows for the introduction of randomness through the superimposition of Gaussian distribution on regular arrays of parametric unit cells, preventing overlaps and providing a template for more accurate mimicry of biological structures across multi-physics problems.
ADDITIVE MANUFACTURING
(2022)
Article
Chemistry, Physical
Laura Traseira-Pineiro, Tony Parry, Frank Haughey, Alvaro Garcia-Hernandez
Summary: This study evaluates the influence of encapsulated rejuvenators on the performance of plant-produced asphalt. The polymeric capsules are found to be capable of resisting mixing without compromising their performance. The deformation of the capsules significantly affects the stability, particle loss, and macrotexture of the asphalt.
Article
Nanoscience & Nanotechnology
Keyvan Jodeiri, Aleksandra Foerster, Gustavo F. Trindade, Jisun Im, Diego Carballares, Roberto Fernandez-Lafuente, Marcos Pita, Antonio L. De Lacey, Christopher Parmenter, Christopher Tuck
Summary: The drive for miniaturization in enzyme-based bioelectronics has led to the development of 3D microstructured electrodes. Additive manufacturing combined with electroless metal plating allows the production of these electrodes with high surface area. The challenge lies in ensuring strong adhesion between the metal layer and polymer structure, which has been achieved in this study through the introduction of an interfacial adhesion layer.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Polymer Science
Ryan R. Larder, Eduards Krumins, Philippa L. Jacob, Kristoffer Kortsen, Robert Cavanagh, Long Jiang, Claudia Vuotto, Iolanda Francolini, Christopher Tuck, Vincenzo Taresco, Steven M. Howdle
Summary: This study presents a novel method for synthesizing polymer-silver composite microparticles using supercritical carbon dioxide, avoiding the use of environmentally harmful solvents. The synthesized composites showed good antimicrobial activity and compatibility in the 3D printing process.
Article
Construction & Building Technology
Daniel Grossegger, Alvaro Garcia, Gordon Airey
Summary: Self-healing of asphalt is a flow process where bitumen flows into cracks to close them. The rheological behavior of bitumen is one of the main factors affecting self-healing, along with damage history, healing duration and pressure. The interaction between bitumen and filler influences the flow, suggesting that the material flowing into cracks during self-healing is a mixture of bitumen, filler, and potentially fine aggregates.
ROAD MATERIALS AND PAVEMENT DESIGN
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Aniela Dunn, Zhaopeng Zhang, Michael D. Horbury, Eleanor Nuttall, Yingjun Han, Mohammed Salih, Lianhe Li, Ehab Saleh, Russell Harris, Nart Daghestani, Diego Pardo, Brian Ellison, Andrew Burnett, Helen Gleeson, Alexander Valavanis
Summary: Liquid crystal devices made with a commercially available material (E7) were analyzed with THz time-domain spectroscopy up to 4.5 THz. These devices were then used to modulate the power output of a 3.4-THz quantum-cascade laser, attenuating the THz power by up to 40% depending on the liquid crystal layer thickness and bias voltage.
2021 46TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER AND TERAHERTZ WAVES (IRMMW-THZ)
(2021)
Article
Physics, Multidisciplinary
P. Petrov, A. P. Hibbins, J. R. Sambles, N. Aboulkhair, E. Saleh
Summary: This research presents a novel metasurface design comprised of capped helices arranged as a hexagonal array that supports a broadband near-isotropic negative-index microwave surface-wave. It demonstrates the ability to provide a structured surface that supports just a negative-index mode over a wide operational band with unprecedented bandwidth, without simultaneously exciting a forward wave. It is a significant advancement in the field of microwave technology.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Construction & Building Technology
Qi Jiang, Wei Liu, Shaopeng Wu, Xuanwen Gou
Summary: This study analyzes the erosion mechanisms of NaCl solution on asphalt concrete and finds that NaCl solution softens asphalt and promotes the intrusion of crystalline salt into it. Salt crystallization alters the surface roughness of aggregates, resulting in a decrease in skid resistance but an improvement in compressive strength. Additionally, the concentration of NaCl solution initially has no significant impact on the mechanical performance of asphalt concrete, but its domination gradually increases with the intensification of cyclic effects.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Lili Kan, Lan-qing Dai, Ning Kong, Bin Peng, Fei Wang
Summary: This paper investigates the effect of freezing and thawing cycles on the tensile behavior of cracked ultra-high performance concrete (UHPC). The results show that long-term freezing and thawing action deteriorates the cracking strength, tensile strength, tensile strain, and strain energy of cracked UHPC. On the other hand, the action of water generally favors the development of tensile properties of UHPC. The crack distribution tends to be unsaturated under freezing and thawing environment, and the re-hydration reaction is hindered. The pore structure near the crack varies under different environments.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Xin Xiao, Jingwei Li, Qingke Meng, Xiangshan Hou, Yanhui Liu, Xujiang Wang, Wenlong Wang, Shengtao Lu, Yuzhong Li, Yanpeng Mao, Tong Li
Summary: Preparing gypsum-based self-leveling mortar (GSLM) using beta-hemihydrate gypsum and solid wastes-derived sulfoaluminate cement (WSAC) can improve the mechanical performance of the mortar, but phosphorus impurities can weaken the hydration speed and degree.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Sihang Bao, Junzhen Di, Yanrong Dong, Ziqing Gao, Qing Gu, Yuanfang Zhao, Hongyu Zhai
Summary: Tailings dam break and leakage accidents pose a threat to the safety of people in mining areas and cause severe environmental pollution. This study focuses on solidifying tailing sand using microbial induced calcite precipitation (MICP) to improve strength and fix heavy metals. The curing time of MICP bio-cemented tailings is found to significantly impact the strength of tailings, while its effect on heavy metal fixation is minimal. The optimized MICP curing time is 10 days, resulting in improved strength and cementation of tailings particles.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Ferhat Benmahiddine, Fares Bennai, Achraf Charaka, Ameur El Amine Hamami, Abdelkader Tahakourt, Rafik Belarbi
Summary: This paper studied the effects of hysteresis on the hygrothermal behavior at the building scale. Through laboratory validation and numerical simulations, it was found that hysteresis has a significant impact on the relative humidity and total heat fluxes in buildings, while it does not have a noticeable effect on temperature variations.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
You Gao, Wei He, Xiayang Zhang, De'an Sun, Pei Li
Summary: This study determined the boundary line between the swelling and compression deformation zone in lateritic clay through wetting tests, and proposed a simple bimodal SWRC model. It also found that the existing strength model underestimated the tested values in the medium to high suction range, therefore a segmented strength equation was introduced for enhanced predictions of the strength properties of lateritic clay.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Prabhath Ranjan Kumar Soda, Asheer Mogal, Kalyan Chakravarthy, Nikhil Thota, Nimish Bandaru, Sanjay Kumar Shukla, K. M. Mini
Summary: This study investigates the use of encapsulated bacteria to improve the self-healing ability of concrete. Through various tests, it is found that using 20% cement-coated alginate beads (CCAB) and 5% nanosilica (NS) can achieve optimal strength and healing. This research is significant for enhancing the durability of concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Shizhe Wang, Haiping Wu, Wen Yang, Wei Wang, Zhibo Zhu, Kun Nie, Luoxin Wang, Hua Wang, Jing Wu
Summary: In this study, photothermal-heat storage concrete (PHSC) was developed with excellent photothermal conversion performance and heat storage capacity. By absorbing and storing solar energy during the day and releasing it at night, PHSC can effectively reduce energy consumption in buildings.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Robin Deb, Jialuo He, Geetika Mishra, Yaghoob (Amir) Farnam
Summary: Incorporation techniques of phase change materials in cementitious composites have a significant influence on thermal properties. This study investigated the thermal behavior of low-temperature PCM when subjected to varying temperature change rates and pore confinement inside the porous network of lightweight aggregates. The results showed that ramp rates affect the nucleation and crystallization growth process during the phase transition, and the pore structure of the aggregates affects the supercooling phenomenon and confinement pressure of the PCM.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Eduardo Ferreira, Payam Sotoudeh, Dagmar Svecova
Summary: This study investigates the fatigue behavior of concrete under different stress reversal conditions. The results indicate that stress reversal generally causes more severe damage and reduces the cycles to failure compared to tensile fatigue. Additionally, adding some level of compression contributes to the energy required for failure under stress reversal fatigue. Specimens with higher concentration of fractured aggregates achieve longer fatigue lives.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Mag Raj Gehlot, Sandeep Shrivastava
Summary: This study evaluates the compatibility relationship between plaster bonds and the substrate under an accelerated aging environment, and finds that incorporating an appropriate amount of granite cutting waste can improve the strength parameters and adhesion of the cement mortar.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Min Zhang, Qirui Luo, Mingke Deng, Shixing Zhao
Summary: This study investigated the bond behavior between carbon FRCM composites with added short fibers and concrete substrates. The effects of different factors were considered and 36 specimens were tested and discussed. The experimental results were analyzed in terms of failure mode, load-slip curve, and characteristic parameters, and the contribution of weft yarns was taken into account in the developed bondslip model.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Dengkai Liu, Hongniao Chen, Ray Kai Leung Su
Summary: The susceptibility of building stones to fire and high temperature was investigated in this study by examining their physical and mechanical properties. The results show that both compressive and tensile properties of stones are affected by temperature changes. The tensile strength is particularly sensitive to temperature changes, requiring special attention to the components subjected to tensile stress in stone buildings. Principal component analysis was used to predict the mechanical properties of stones, providing a new method for calculating the residual mechanical properties after high temperature or fire.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Joso Maria Raposo, Eduardo Cavaco, Luis Costa Neves, Eduardo Julio
Summary: This paper investigates the correlation between the friction coefficient and the surface roughness of concrete-to-concrete interfaces. Experimental tests were performed on specimens with different surface treatments, and the surface roughness parameters were analyzed and correlated with the shear strength and friction coefficient. The results showed that certain roughness parameters had a strong positive correlation with the friction coefficient, while others had little or no correlation. A novel combined roughness parameter with optimized correlation was proposed.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Chiara Riccardi, Massimo Losa
Summary: The interest in using bio materials in asphalt pavements is growing due to economic reasons and environmental benefits. This study aimed to review the use of bio extenders as additives in binders, with a focus on replacements greater than 20% of fossil binder. The properties of bio-extended binders were found to vary substantially depending on the biomass source and production process.
CONSTRUCTION AND BUILDING MATERIALS
(2024)