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Application of low-temperature microwave radiation on the preparation of UHPC

Low-Carbon Materials and Green Construction 2025年第1期3卷 1-17页

作者： Li, Xusen Wang, Jiarui Li, Shuangxin Gao, Xiaojian Shi, Zhenwu School of Civil Engineering and Transportation Northeast Forestry University Harbin150040 China Longjian Road and Bridge Co. Ltd Harbin150040 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China Key Lab of Structures Dynamic Behaviour and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China

This study investigates using low-temperature microwave radiation to prepare ultra-high-performance concrete (UHPC), aiming to contribute to sustainable and green concrete technology. Immediate microwave curing (IMC) accelerates the early hardening process, but rapid moisture loss challenges prolonged hydration and strength development. The research combines strength tests, X-ray diffraction, differential thermal analysis and thermogravimetric analysis, scanning electron microscopy with energy dispersive X-ray spectroscopy, and COMSOL simulations to understand these mechanisms. The findings reveal that microwaves' unique magnetic effects activate interactions between ions, leading to the formation of atypical phases such as hydrotalcite-like phase (HTlp), calcium silicide (CaSi2), and thaumasite-like phase (TSAlp). Unlike delayed microwave curing (DMC), IMC produces crystalline phases such as ettringite, HTlp, TSAlp, and gypsum, while calcium hydroxide (CH)—commonly observed in Portland cement hydration—is absent, reflecting distinct hydration pathways. These results suggest that IMC alters the hydration process and microstructure of UHPC. Curing regimes must address moisture retention to ensure sufficient hydration for improved mechanical and microstructural properties to enhance its performance. This study highlights the potential of IMC as a rapid curing method while emphasizing the need for strategies to mitigate its limitations. © The Author(s) 2025.

关键词： Ultra-high performance concrete

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A dual⁃parameter method for seismic resilience assessment of buildings

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Journal of Southeast University(English Edition) 2025年第1期41卷 1-11页

作者： LI Shuang HU Binbin LIU Wen ZHAI Changhai Key Laboratory of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of TechnologyHarbin 150090China Key Laboratory of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of TechnologyHarbin 150090China

To quantify the seismic resilience of buildings,a method for evaluating functional loss from the component level to the overall building is proposed,and the dual-parameter seismic resilience assessment method based on postearthquake loss and recovery time is improved.A threelevel function tree model is established,which can consider the dynamic changes in weight coefficients of different category of components relative to their functional *** networks are utilized to quantify the impact of weather conditions,construction technology levels,and worker skill levels on component repair time.A method for determining the real-time functional recovery curve of buildings based on the component repair process is *** a three-story teaching building as an example,the seismic resilience indices under basic earthquakes and rare earthquakes are *** results show that the seismic resilience grade of the teaching building is comprehensively judged as GradeⅢ,and its resilience grade is more significantly affected by postearthquake *** proposed method can be used to predict the seismic resilience of buildings prior to earthquakes,identify weak components within buildings,and provide guidance for taking measures to enhance the seismic resilience of buildings.

关键词： seismic resilience assessment dual-parameter method functional loss recovery time Bayesian networks

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Damage Assessment of RPC Strengthened RC Columns Subjected to Blast Loading

Damage Assessment of RPC Strengthened RC Columns Subjected t...

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5th International Conference on Hydraulic, Civil and Construction Engineering, HCCE 2023 and 9th International Conference on Hydraulic and Civil Engineering, ICHCE 2023

作者： Fu, Yu Qiu, Siyuan Yu, Zhifu Su, Juan Hou, Xiaomeng Offshore Oil Engineering Co. Ltd Tianjin300461 China Key Lab of Structures Dynamic Behavior and Control of Ministry of Education Harbin Institute of Technology Harbin150090 China

ISBN: (纸本)9789819740895

In our country, there are 60 billion square meters of existing leasable area, reactive powder concrete (RPC) has the characteristics of high toughness and high strength-to-weight ratio. RPC strengthened concrete (RC) forms RPC-RC structure, it is an important way for sustainable development of civil engineering to improve the anti-explosion ability of building structure while strengthening and reforming the structure. The dynamic response and damage assessment methods of RPC-RC columns subjected to blast loading are not clear. In order to solve this problem, the dynamic response of RPC-RC column under blast loading is simulated by using LS-DYNA finite element software, the Pressure-Impulse curve of RPC-RC column is established by using simplified numerical method, and the parameters of Pressrue-Impulse curve are analyzed. Finally, based on the results of parameter analysis, the formulas for calculating the overpressure asymptote and impulse asymptote are obtained, and the damage assessment method for RPC-RC columns is established. © The Author(s) 2025.

关键词： Impulse response

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Physical Review Fluids 2024年第5期9卷 054608-054608页

作者： Xue-Lu Xiong (熊雪露) Shujin Laima (赖马树金) Hui Li (李惠) Yi Zhou (周毅) School of Energy and Power Engineering Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Guangdong-Hong Kong-Macao Joint Laboratory for Data-Driven Fluid Mechanics and Engineering Applications

This paper presents a quadrant analysis of turbulent rotor wakes, placing a particular emphasis on the self-similarity in single-point turbulent statistics. The self-similarity analysis reveals that within the wake self-similar region, the distribution of the Reynolds shear stress −u′v′¯ and the turbulent kinetic energy k in different quadrants can also attain a state of self-similarity. The length scaling is the same for −u′v′¯, k, and their different quadrant contributions. However, the velocity scaling of the ejection contribution differs from that of −u′v′¯ and k. Additionally, the analysis of hole filtering and spectrum filtering effects on the self-similarity and scaling of the ejection contribution to −u′v′¯ reveals a strong connection between ejection events and large-scale coherent structures, as well as deceleration extreme events. This finding is further confirmed through quadrant analysis of the time evolution of velocity fluctuations. The present study can be helpful in improving our understanding of the turbulent wake self-similarity.

关键词： Shear flows Wakes & jets

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Experimental investigation on cenosphere-aluminum syntactic foam-filled tubes under axial impact loading

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第11期24卷 978-990页

作者： Li WANG Boyi ZHANG Jian ZHANG Yuexin JIANG Wei WANG Gaohui WU School of Civil Engineering Harbin Institute of TechnologyHarbin 150090China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of TechnologyHarbin 150090China Center for Metal Matrix Composites Engineering Technology Harbin Institute of TechnologyHarbin 150006China

A new syntactic foam material was prepared by screening three different average particle sizes of cenospheres(150,200,and 300μm)from industrial waste fly *** impact testing on syntactic foam filler and foam-filled tubes was conducted using a drop hammer test *** effects of parameters,such as the size of cenospheres and the impact velocity,on the mechanism of deformation,mechanical characteristics,and capacity for energy absorption of the specimen were *** this basis,the differences in compressive properties exhibited by the syntactic foam-filled tubes under the two loading conditions were *** results indicate that with the decrease in the average diameter of cenospheres,the initial peak crushing load and mean crushing load of foam-filled tubes increase,while the compression efficiency *** specific energy absorption(SEA)of the syntactic foam-filled tube can reach 25 J/*** the increase of impact velocity,the SEA of the specimen increases *** was demonstrated that the syntactic foam-filled tube exhibits a higher effective energy absorption ratio under impact loading compared to quasi-static loading.

关键词： Cenosphere-aluminum syntactic foam Crashworthiness Mechanical properties Absorption of energy

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Research on experimental similarity criterion and snowdrifts on two-span single-pitch roofs 20th

Research on experimental similarity criterion and snowdrifts...

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20th fib Symposium on ReConStruct: Resilient Concrete structures, 2024

作者： Zhang, Qingwen Wang, Yongsuo Zhang, Guolong Zhang, Yu Fan, Feng Key Laboratory of Structures Dynamic Behavior and Control of China Ministry of Education Harbin Institute of Technology Harbin150090 China Key Laboratory of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China China Telecom Corporation Limited Beijing Branch Beijing100032 China

ISBN: (纸本)9782940643257

Extreme blizzards have been striking the world, causing widespread building collapses. Among them, two-span roofed structures are vulnerable to snowdrifts due to the overloaded snow accumulated in the valley area. Considering the widely use of such roof in concrete structures, deep research of snowdrifts on two-span single-pitch roofs were conducted based on the snow-wind combined experiment facility and a new similarity criterion. Firstly, a snowfall-process-based experiment facility and a new Froude similarity number were proposed. The experiment facility is an open wind tunnel, which could simulate the snowfall process by spraying the artificial snow particles into the manmade flow field. The Froude number was revised based on the friction velocity ratio, which could better restore the snow drifting process. Through systematic validation, their reliability in predicting snowdrifts was fully proved. Then, a series of wind tunnel tests of snowdrifts on two-span single-pitch roofs were conducted with various inflow conditions and roof shapes. The results show that the snow distribution pattern on the roof is mainly determined by the roof slope. While for each type of roof slope, the wind velocity has little effect on the snow distribution. As for the wind direction, two types of typical unbalanced distribution of snow on the roof were observed. © fédération internationale du béton (fib).

关键词： Wind tunnels

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Axial Compressive behaviors of the Curved Steel-Plate Composite Walls with Small Curvature Radius-to-Section Thickness Ratio

SSRN

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SSRN 2024年

作者： Guo, Lanhui Liu, Cheng Gao, Shan Yu, Yue Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China China National Nuclear Power Co. Ltd Beijing China

Curved steel-plate composite (SC) walls are widely used in nuclear engineering due to their advantages in seismic performance and modular construction. This study tested the axial compression performance of five curved SC wall specimens and three flat SC wall specimens by considering the effects of the curvature radius-to-section thickness ratio (R/T) and connector spacing-to-steel plate thickness ratio (b/t). The tested results show that the steel plates in curved SC walls with small R/T (R/T © 2024, The Authors. All rights reserved.

关键词： Axial compression

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Characteristics of aerodynamic force and flow structure behind single box girder under isolated slit control

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Journal of Central South University 2022年第8期29卷 2542-2557页

作者： CHEN Guan-bin CHENWen-li Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of TechnologyHarbin 150090China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of TechnologyHarbin 150090China

An isolated slit was placed in a single box girder to obtain passive leading-edge suction and trailing-edge jet flow to control the unsteady aerodynamic force and modify the flow *** Great Belt East Bridge was used as a physical model at a geometric scale of 1:*** tunnel experiments were conducted at an incoming airflow speed of 10 m/s,and the Reynolds number was calculated as 2.3×104 using the test model height and wind *** surface pressure distribution was measured,and the aerodynamic force acting on the test model with and without the isolated slit was calculated by integrating the pressure *** was found that the control using an isolated slit can dramatically decrease the fluctuating surface pressure distribution and aerodynamic *** analysis on the power spectral density of the lift force revealed that the isolated slit accelerated vortex ***,high-speed particle image velocimetry was used to investigate the wake flow structure behind the test model.A vortex separated from the upper surface was pushed to a lower location and the wake flow structure was modified by the isolated slit.A proper orthogonal decomposition(POD)of the flow field showed that the first two POD modes in the controlled case contributed less energy than those in the uncontrolled case,indicating that more energy was transferred to higher modes,and small-scale vortices had more energy.A secondary instability structure was found in the wake flow for a nondimensional jet momentum coefficient J of 0.0667.

关键词： single box girder isolated slit aerodynamic force proper orthogonal decomposition(POD)mode

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Energy Harvesting of Novel Smart Concrete Based on Nanotechnology: Experimental and Numerical

SSRN

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SSRN 2024年

作者： Zhang, Mingming Zhu, Lihua Gao, Shan Yuan, Hanquan Liu, Tong School of Civil Engineering Xi’an University of Architecture and Technology Shaanxi Xi’an710055 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China

This paper focuses on energy harvesting and smart controls in concrete structures using both experimental and theoretical approaches. The growing demand for sustainable energy solutions has led to innovations in materials like concrete, which offer energy conversion and efficient control possibilities. This study introduces a novel concept for concrete structures using piezoelectric nanoparticles, specifically zinc oxide nanoparticles (ZnO), offering three key benefits: (a) enhanced strength, (b) energy harvesting and storage, and (c) smart control. The experimental phase involves modifying concrete structures with energy harvesting technologies. Dispersion of nanoparticles in water is a key challenge, addressed through magnetic stirring, ultrasonic homogenization, and mechanical stirring. Multiple concrete specimens with nanoparticles were produced, followed by tests including compressive strength assessments, energy harvesting under mechanical loads, and intelligent control of concrete deflection through voltage application. On the theoretical front, modeling and numerical methods predict the behavior of energy harvesting concrete structures. The precise five-parameter theory, accounting for Poisson's effect, is employed for modeling. After deriving governing equations, differential quadrature numerical technique computes deflection and output voltage. Comparisons and validations are made between experimental and simulation results. The experiments reveal that the optimal ZnO nanoparticle content is 0.9%, leading to significant compressive strength improvements of 22.14%, 27.31%, and 34.28% for 7, 14, and 28-day samples, respectively, compared to controls. Beyond this content, compressive strength diminishes. Moreover, 0.9% ZnO-concrete produces an output voltage of 32 volts, well-justified technically and economically. Additionally, +50V voltage induces 9.2mm deformation, while -50V voltage yields 5.8mm, showcasing a substantial 63% deformation alteration potenti

关键词： Energy harvesting

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A novel porous shock absorption layer for tunnels: Shock absorption performance and parameter analysis

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Earthquake Engineering and Engineering Vibration 2025年第2期24卷 437-450页

作者： Zhou Tonglai Dong Changsong Li Shuang Sun Qiangqiang Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of TechnologyHarbin 150090China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of TechnologyHarbin 150090China State Key Laboratory of Green and Long-Life Road Engineering in Extreme Environment CCCC First Highway Consultants Co.Ltd.Xi’an 710075China Institute of Geotechnical Engineering College of Civil Engineering and ArchitectureHebei UniversityBaoding 017002China

A novel porous shock absorption layer is put forward in this study, and the shock absorption performance of the porous shock absorption layer is evaluated based on three-dimensional pseudo-static analysis. The modified reaction acceleration method is adopted and validated in the three-dimensional model. Seven ground motions are selected and the peak ground acceleration is adjusted to 0.2 g, 0.4 g and 0.6 g. The impact of the void ratio and thickness of the porous shock absorption layer is studied, while the surrounding rock grade and tunnel depth are also investigated. The numerical results show that the porous shock absorption layer has good shock absorption performance and can effectively reduce the maximum internal force of the secondary lining, but it cannot reduce the maximum horizontal relative displacement of the secondary lining. The circumferential rubber strip in the porous shock absorption layer will reduce shock absorption performance. The results of parameter analysis indicate that the shock absorption performance of the porous shock absorption layer increases with the increase of the void ratio and thickness, and it has good shock absorption performance under different surrounding rock grades and tunnel depths.

关键词： tunnel porous shock absorption layer shock absorption performance reaction acceleration method parameter analysis

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