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Exploring Mechanical Properties of a Novel Sustainable Preplaced Aggregate Polypyrene and Glass Fiber Reinforced Concrete Using Portland Limestone Cement

SSRN

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SSRN 2024年

作者： Zhang, Ji Saleh, Majed Ali School of Civil and Hydraulic Engineering Huazhong University of Science and Technology Wuhan430074 China National Center of Technology Innovation for Digital Construction Wuhan430074 China Civil Engineering Department College of Engineering University of Zintan Zintan Libya

This study presents a novel approach of incorporating Portland limestone cement (PLC) into preplaced aggregate fiber reinforced concrete (PAFRC) to create an environmentally friendly concrete that minimizes CO2 emissions by reducing the energy consumption in cement production. The process involves premixing and placing aggregates and fibers inside the formwork before injecting flowable grout. This study examines the mechanical properties of an innovative and environmentally friendly concrete that incorporates PLC and fibers. To achieve the desired objective, the experimental setup involved using polypyrene fibers and glass fibers in a preplaced aggregate concrete (PAC) mixture. In this research utilized doses of fibers ranged up to 6% were added. The study revealed that the implementation of PLC and high fiber doses resulted in some improved mechanical properties. Adding 4% of polypyrene fibers had the perfect improvement to the PAFRC compressive, tensile strengths and elastic modulus by 15.2%, 15.9%, and 18.6%, respectively. The addition of 1% and 2% glass fibers produced notable enhancement in the flexural strength, exhibiting an increase of 10.2% and 10.4%, respectively when compared to the fiberless mixture. This study shows that utilizing PLC in PAFRC provide sustainable and economically concrete for the construction industry. © 2024, The Authors. All rights reserved.

关键词： Glass fibers

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Dynamic properties of polyurethane foam adhesive-reinforced gravels

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Science China(Technological Sciences) 2021年第3期64卷 535-547页

作者： LIU Ping MENG MinQiang XIAO Yang LIU HanLong YANG Gui School of Civil Engineering Ludong UniversityYantai 264025China School of Civil Engineering Chongqing UniversityChongqing 400045China Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing UniversityChongqing 400045China College of Civil and Transportation Engineering Hohai UniversityNanjing 210098China Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai UniversityNanjing 210098China

Polyurethane foam adhesive(PFA)has been introduced as an alternative stabilizer in geotechnical applications because PFA can improve the engineering characteristics of soil by filling the pore space and generating adhesive bonding among the ***,the dynamic properties of PFA-reinforced soils are not well *** analyze the dynamic characteristics of PFA-reinforced gravels,a series of cyclic triaxial tests were carried out to investigate the shear modulus and damping ratio of PFA-reinforced gravels,and to determine the corresponding effects of the PFA content,confining pressure,consolidation stress ratio and loading *** results showed that the shear modulus increased,and the damping ratio decreased as the PFA content,confining pressure and consolidation stress ratio *** contrast,the effect of the loading frequency,which ranged from 0.05 to 1 Hz,was negligible.A modified hyperbolic empirical model can consider the effect of the PFA content on the maximum shear modulus and predict the relationship between the normalized shear modulus and the normalized shear strain was ***,the upper and lower bounds of the damping ratio were also proposed.

关键词： polyurethane foam adhesive gravel shear modulus damping ratio cyclic triaxial test

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IOT-Enhanced Wastewater Management Using CRNN Towards Sustainable Smart Cities 2

IOT-Enhanced Wastewater Management Using CRNN Towards Sustai...

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2nd International Conference on Disruptive Technologies, ICDT 2024

作者： Ramalakshmi, R. Gangwar, Prashant Kumar Joshua Oyebode, Oluwadare Krishnan, Sangeetha Easwaran, Balamurugan Baby Shamini, P. Ramco Institute of Technology Department of Ece Rajapalayam India Woldia University Department of Construction Technology & Management Woldia Town Ethiopia Afe Babalola University Ado-Ekiti Civil and Environmental Engineering Department Ekiti State Nigeria University of Africa Toru-Orua Nigeria Texila American University Lilayi Lusaka Zambia R.M.K Engineering College Department of Computer Science and Engineering Tamilnadu Chennai India

ISBN: (纸本)9798350371055

Traditional methods of wastewater treatment have been stretched to their limits because of the exponential expansion in wastewater production that has been caused by urbanisation. It is necessary for smart cities to implement solutions that are not just effective but also technologically advanced if they are to achieve ecological sustainability. The ability to monitor and adjust in real time is typically absent from the wastewater management systems that are currently in utilisation. According to the findings of the research, there is a gap in the combination of the Internet of Things and Convolutional Recurrent Neural Networks (CRNN), which might lead to improved management strategies. This is necessary to address the ever-changing composition and movement of wastewater. According to the findings of the study, a novel approach might be implemented by utilising CRNN for predictive analytics and Internet of Things (IoT) sensors for real-time data collection methods. Together, they make it feasible to predict problems and maintain a close eye on the characteristics of wastewater in real time, which paves the way for proactive management techniques. It is because of the results, which reveal a significant improvement in the accuracy of predicting important wastewater parameters, that timely actions are now possible. The IoT and CRNN have been combined to provide enhanced adaptation to changing conditions, which has led to wastewater treatment techniques that are more sustainable and efficient. © 2024 IEEE.

关键词： CRNN IoT Smart Cities Sustainability Wastewater Management

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Active Prediction Model of Freeway Potential Traffic Hazards Based on Alignment and Traffic Characteristics 13th

Active Prediction Model of Freeway Potential Traffic Hazards...

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13th International Conference on Green Intelligent Transportation Systems and Safety, GITSS 2022

作者： Yining, Lou Yang, Chen Yiwen, Zhang Jiajia, Tian Tielei, Wu Department of Civil and Environmental Engineering Imperial College London LondonSW7 2BX United Kingdom Heilongjiang Highway Construction Center Harbin150090 China Department of Industrial Engineering and Operations Research Columbia University New YorkNY10027 United States School of Transportation Science and Engineering Harbin Institute of Technology Harbin150090 China

ISBN: (纸本)9789819730513

In order to realize the safety evaluation of freeway alignment design in the design and construction stage and find out the potential traffic safety hazards, carry out a study on the expressway traffic accident prediction model. Based on the relevant alignment design, traffic characteristics and accidents data, build the primary accident prediction model, considered different conditions of alignment design and traffic control features of the influence of the traffic accident, adjusted the primary accident model by accident correction factor, established an active expressway accident prediction model based on alignment design and traffic characteristics, and carried out the goodness of fit test and example verification. The results show that the fitting effect of the model is good, and the accident prediction results are close to the actual accident data, which proves the validity of the model. The research results can provide theoretical basis for freeway improvement measures in the design and construction stage and improve the level of freeway traffic safety. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Hazards

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Calculation and Analysis of Segment Buoyancy in Large-Diameter Shield Tunneling 9

Calculation and Analysis of Segment Buoyancy in Large-Diamet...

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9th International Technical Conference on Frontiers of Hydraulic and civil engineering technology, HCET 2024

作者： Sun, Jiuchun Sheng, Haoxiang Yu, Shi Sang, Yunlong Liang, Zhibin Wang, Zhe Zhou, Qihui Liu, Heng Sheng, Jianchao Tengda Construction Group Co. Ltd. Shanghai200122 China Zhejiang Key Laboratory of Civil Engineering Structures & Disaster Prevention and Mitigation Technology Zhejiang University of Technology Hangzhou Zhejiang310012 China Ningxia Hui Autonomous Region Institute of Hydrological and Environmental Geology Yinchuan750004 China Huadong Engineering Corporation Limited Hangzhou311100 China

ISBN: (纸本)9781643685595

Based on the Zhipu Road-Fuxing Road large-diameter tunnel project, this paper analyzes the force characteristics of the segment during the synchronous grouting stage through theoretical research and field tests on the time-varying dissipation law of the force on the segment. It introduces the time-varying coefficient of the buoyancy force dissipation of the segment. The buoyancy force of the segment and the resistance to the buoyancy force are analyzed. The calculation formula for the buoyancy of the segment is derived using the method of hydrostatic equilibrium and is compared with the measured results. The findings show that by considering the time-varying dissipation force of the segment's buoyancy force, the final buoyancy of the segment can be better predicted. The calculation closely matches the measured values, indicating that the prediction formula for the buoyancy of the segment has high accuracy and reliability. © 2024 The Authors.

关键词： Buoyancy

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Evaluation of the Performance of Reinforced Concrete Beams with 3D-Printed Permanent Formwork

Journal of Intelligent Construction

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Journal of Intelligent construction 2025年第4期2卷 1-17页

作者： Jingyuan Guan Li Wang Yimiao Huang Guowei Ma Yaxin Tao School of Civil and Transportation Engineering Hebei University of Technology Tianjin China Hebei Engineering Research Center of Construction 3D Printing Hebei University of Technology Tianjin China Institute for Building Materials ETH Zurich Zurich Switzerland

Understanding the advantages of combining traditional construction methods and 3D concrete printing is the gateway to the general structural applicability of three-dimensional concrete printing (3DCP) technology. To further this ob-jective, in this study, 3D-printed concrete is used as permanent formwork for the manufacture of reinforced concrete beams. Different treatment methods for the interfaces between the printed formwork and the cast core concrete, including embedding of shear connectors, entraining of micro-cables, and inclusion of ribs in the 3D printing of the formwork, are explored to improve the integral mechanical capacities of so-called 3D-printed and cast-in-place composite beams. Specifically, flexural behaviors are studied experimentally through ob-servation of damage and failure processes via visualization with the digital image correlation (DIC) method. The mesoscale architecture at the interface between 3D-printed permanent formwork and cast-in-place concrete is investigated through computed tomography (CT) scanning to infer the cooperative bonding mechanisms of different bonding treatment methods. The stress-transfer mech-anism is thus elucidated. The applicability of 3D-printed concrete as permanent formwork is validated in view of a 14.3% increase in the bending capacity from a composite beam with bottom ribs compared to that of a completely cast counterpart. From the experiments, incorporation of shear connectors contributes most to the bonding performance of the formwork-concrete interfaces. Mean-while, interfacial bonding can be enhanced by increasing the roughness of the 3D-printed formwork, interlocking of the formwork with the inner aggregated concrete, or improving the consistency of the elastic and shear moduli of the formwork and cast concrete. In particular, the appropriate thickness of both the formwork and the aggregated concrete as a cover to yield the optimal inte-grated bending capacity of composite beams is derived from the cur

关键词： Connectors Deformation Computed tomography Bending Three-dimensional printing Concrete Structural beams Bonding Ribs Surface treatment

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Sulphate resistance of lightweight aggregate concrete comprising sieved palm oil fuel ash as fine aggregate replacement

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Materials Today: Proceedings 2022年 66卷 2536-2540页

作者： Muthusamy, Khairunisa Wan Ahmad, Saffuan Hashim, Mohd Hanafi Mohamad, Nabilla Kirgiz, Mehmet Serkan Kamarudin, Muhammad Aimran Amzar Ravindran, Gobinath Faculty of Civil Engineering Technology Universiti Malaysia Pahang Lebuhraya Tun Razak Gambang 26300 Malaysia Department of Civil Engineering College of Engineering Universiti Malaysia Pahang Lebuhraya Tun Razak Gambang 26300 Malaysia Kolej Komuniti Pekan Jalan-Pekan-Kuantan Kampung Batu Satu Peramu Pekan 26600 Malaysia Department of Architecture Faculty of Engineering and Natural Sciences İstanbul Sabahattin Zaim University Küçükçekmece 34303 İstanbul Turkey Civil Engineering and Center for Construction Methods and Materials SR University Telangana Warangal India

Oil palm shell (OPS) and palm oil fuel ash (POFA) disposal from palm oil industry causes environmental pollution. The present research investigates the compressive strength and sulphate resistance of oil palm shell lightweight aggregate concrete containing palm oil fuel ash as partial fine aggregate replacement. Sieved POFA was used as partial fine aggregate replacement from 0% up to 20% by weight of sand. Water cured specimens were tested to determine compressive strength and durability towards sulphate attack. Use of 10% POFA slightly enhances concrete strength and durability against sulphate attack via pozzolanic reaction from the fraction of fine ash present. © 2022

关键词： Palm oil

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Comparative analysis of thermodynamic and mechanical responses between underground hydrogen storage and compressed air energy storage in lined rock caverns

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International Journal of Mining Science and technology 2024年第4期34卷 531-543页

作者： Bowen Hu Liyuan Yu Xianzhen Mi Fei Xu Shuchen Li Wei Li Chao Wei Tao Zhang State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China Key Laboratory of Large Structure Health Monitoring and Control Shijiazhuang Tiedao UniversityShijiazhuang 050043China School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhou 221116China

Underground hydrogen storage(UHS)and compressed air energy storage(CAES)are two viable largescale energy storage technologies for mitigating the intermittency of wind and solar ***,it is meaningful to compare the properties of hydrogen and air with typical thermodynamic storage *** study employs a multi-physical coupling model to compare the operations of CAES and UHS,integrating gas thermodynamics within caverns,thermal conduction,and mechanical deformation around rock *** thermodynamic responses are validated using additional simulations and the field test *** and pressure variations of air and hydrogen within rock caverns exhibit similarities under both adiabatic and diabatic simulation *** reaches higher temperature and pressure following gas charging stage compared to air,and the ideal gas assumption may lead to overestimation of gas temperature and *** steel lining of CAES,the sealing layer(fibre-reinforced plastic FRP)in UHS is prone to deformation but can effectively mitigates stress in the sealing *** CAES,the first principal stress on the surface of the sealing layer and concrete lining is tensile stress,whereas UHS exhibits compressive stress in the same *** present research can provide references for the selection of energy storage methods.

关键词： Underground hydrogen storage Compressed air energy storage Mechanical response Thermodynamic response Lined rock caverns

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Numerical parametric evaluation of ultimate resistance of high-strength bolts

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Structures 2023年 56卷

作者： Li, Jie Xin, Haohui Wang, Zhiqiang Veljkovic, Milan Bingzhen, Zhao Zhao, Junjie Correia, José A.F.O. Department of Civil Engineering Xi'an Jiaotong University Xi'an710116 China Shaanxi Construction Engineering Holding Group Xi'an710116 China Faculty of Civil Engineering and Geosciences Delft University of Technology Netherlands Department of Civil Engineering University of Porto Portugal

High strength bolts are widely used in the engineering field due to their good compressive properties. Accurate assessment of the ultimate capacity performance of high strength bolts under combined loading is essential to ensure the safety of steel structures in the connection zone. Existing studies are not sufficiently clear on the economic and condition-specific limits on the effects of various factors on high-strength bolts under complex stress conditions. In response to these problems, the aim of this paper is to analyse the effects of different factors on the load-bearing performance of high-strength bolts on the basis of numerical simulations. The mesoscale critical plastic strain (MCEPS) method was used on the model fracture and the accuracy of the model evaluation was verified. The effects of grade, type, diameter and bolt hole clearance on the ductile fracture behaviour of high-strength bolts were investigated. It was found that fully threaded bolts and through-hole clearances can mainly affect the load-bearing properties of high-strength bolts and increase the bolt's fracture-deformation capacity. The load-bearing performance of high-strength bolts under the influence of different factors was also compared with the Eurocode design (EC3) predictions. © 2023

关键词： Bolts

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Derivation of Similarity Relationship in 1g Shaking Table Test of Rock Slopes Considering Deformation Evolution Stage

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Science technology and engineering 2025年第1期25卷 309-320页

作者： Wen, Zhao Liu, Han-Xiang Wang, Ming-Xuan Wei, Ying-Song Xu, Peng College of Environment and Civil Engineering Chengdu University of Technology Chengdu610059 China Institute of Geotechnical Engineering AVIC Beijing100098 China Sichuan Sixth Construction Co. Ltd. Chengdu610081 China

1g shaking table test refers to the shaking table test carried out under conventional gravity conditions, which is the mainstream type of shaking table test at present. A distinction was made between strict similarity models and strain distortion models, primarily utilizing the control equation method with supplementary dimensional analysis. The similarity relationships between these models and the prototype during different deformation stages in rock slope 1g shaking table tests were theoretically derived, and the key parameters required to achieve similarity between the model and the prototype were established. Numerical tests were conducted to verify and evaluate the established similarity relationships for different deformation stages, considering the inherent vibration characteristics and dynamic response characteristics of rock slopes. The results indicate that both strict similarity models and strain distortion models can accurately calculate the natural vibration characteristics of the prototype slope and the dynamic response characteristics during the elastic deformation stage under seismic loads. However, for large deformation issues, it is recommended that the strain similarity ratio be close to or equal to 1. These research findings provide valuable references for the design of similarity relationships and the selection of similarity models in 1g shaking table tests for rock slopes. © 2025 Beijing Kexue Jishu yu Gongcheng Zazhishe. All rights reserved.

关键词： Elastic deformation

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