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6th International Conference on civil engineering, ICOCE 2022

作者： Li, Hao Cao, Hui School of Civil Engineering Chongqing University Chongqing400045 China MOE Key Lab of New Technology for Construction of Cities in Mountain Area Chongqing University Chongqing400045 China

ISBN: (纸本)9789811939822

In order to ensure the normal operation of prestressed anchor cable, the detection of anchor force is a very important link in the health detection of prestressed anchor cable. By analyzing the relationship between nonlinear vibration characteristics and anchoring force, this paper explores the nondestructive testing method of anchoring force. The concrete workbench was used to simulate the soil anchored by the anchor cable. Under the condition of maintaining the tension at all levels by the pull-out apparatus, the lateral excitation was carried out at the anchor head of the anchor cable, and the free vibration acceleration signal of this part was recorded. The first-order frequency signal was decomposed by AMD, and Hilbert transform was performed on it to obtain the relationship between the frequency, amplitude and time of the signal, and then the frequency-amplitude curve reflecting the nonlinear vibration characteristics was obtained. The same amplitude segment is selected on the frequency-amplitude curve, and the corresponding frequency difference is used as the nonlinear index to analyze the relationship between the tension (anchoring force) and the nonlinear vibration degree of each level. The test and analysis results show that the degree of nonlinear vibration decreases with the decrease of anchorage force. Therefore, the nonlinear index can be used to judge the anchoring force of anchor cable. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Nondestructive examination

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Partial substitution of the cement by cinder power in the composition of High Strength Concrete (HSC)

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Materials Today: Proceedings 2023年

作者： Dharmaraj, R. Thangaraj, S. Narayanan, Karuppasamy Joshva, J. Indirajith, L. Chandraprakash, V. Department of Civil Engineering KPR Institution of Technology Coimbatore India Department of Civil Engineering Sona College of Technology Salem India Veerman Construction Company Coimbatore India

The current experimental inquiry in this work aims to produce high strength concrete of grade M80 by using cinder powder as a substantial replacement for conventional Portland cement. ACI 211-4R was used to develop the mix design for M80 concrete mix. The concrete samples are subjected to hardened property tests. The specimens were made with several percentages of cinder replacement, such as 0%, 2.5%, 5%, 7.5%, and 10%, and binder ratios of 0.35 with super plasticizer. To ascertain the compressive strength of the concrete, the concrete's compressive strength, cubes of 100 × 100 × 100 mm are cast. By casting cylinders with a diameter of 100 mm and a height of 200 mm, it is possible to determine the tensile strength of concrete. At the age of 28 days, this mixture's compressive strength was found to be 92.25 MPa, and the best results were obtained when cinder powder was substituted for OPC in 5% of the mix together with super plasticizer and 0.35 water to binder ratio. Similarly split tensile and flexural strength performance have been upgraded upto 25.31% and 16.32% with for optimized 5% substitution of cinder powder compared to control concrete. © 2024 Elsevier Ltd. All rights reserved.

关键词： Compressive strength

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Seismic Fragility Analysis of Precast Concrete Sandwich Wall Panel Structure

Seismic Fragility Analysis of Precast Concrete Sandwich Wall...

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2024 IEEE International Workshop on Metrology for Living Environment, MetroLivEnv 2024

作者： He, Jiaxuan Milani, Gabriele Dong, Yaorong Southeast University Joint Laboratory on Smart Disaster Prevention of Major Infrastructures China-Pakistan Belt and Road Nanjing China Politecnico di Milano Department of Architecture Built Environment and Construction Engineering Milan Italy School of Civil Engineering Xi'an University of Architecture and Technology Xi'an China

ISBN: (纸本)9798350385014

This study presents the seismic fragility analysis of a two-story precast concrete sandwich wall panel structure (PCSWPS) with bolt connections through numerical analysis. A finite element model (FEM) consisting of multi-layer shell elements and nonlinear springs is established and analyzed, which is verified by comparison with shake table test results. Seismic fragility curves are constructed based on the Latin hypercube sampling Monte Carlo simulation (LHS-MC), enabling rapid evaluation of the seismic performance of PCSWPS. The results demonstrate that the developed FEM accurately reproduces the dynamic structural responses of PCSWPS. The seismic fragility analysis shows that the PCSWPS with novel dry connections exhibits good seismic performance, which is reliable, repairable, and resistant to collapse under rare earthquakes. © 2024 IEEE.

关键词： Monte Carlo methods

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A Review of Synergies Between Industry 4.0, construction 4.0, and Education 4.0 in the engineering Education Context 53

A Review of Synergies Between Industry 4.0, Construction 4.0...

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53rd IEEE ASEE Frontiers in Education International Conference, FIE 2023

作者： De Souza, Alex Sander Clemente Debs, Luciana Federal University of São Carlos Department of Civil Engineering São Carlos Brazil School of Construction Management Technology Purdue University West Lafayette United States

ISBN: (纸本)9798350336429

The new paradigms and technologies of industry 4.0 and construction 4.0, mainly the integration of production processes through digitization and connectivity, have demanded new knowledge and skills from professionals. To match this need, civil engineers and construction managers must have a high-level of education with flexibility, critical thinking, and innovation skills. In education, the combination of emerging digital technologies, innovative pedagogical processes and spaces, and active learning has been called education 4.0. Education 4.0 involves key concepts capable of transforming engineering education with the participation of society, industry, university, and the government. Through a scoping literature review, our goals are: (1) to evaluate the impacts of Industry 4.0 (I4.0), construction 4.0 (C4.0), and Education 4.0 (E4.0) on engineering education and the synergy between these concepts;(2) to evaluate how undergraduate teaching in civil engineering and construction Management is synergistically inserted with I4.0, E4.0 and C4.0;and to identify the challenges and opportunities for improving these programs. The authors utilized a scoping literature review using the Scopus database to identify research related to education in civil engineering and construction Management within each concept (I4.0, C4.0, and E4.0). The works selected in the searches were analyzed quantitatively and qualitatively to identify the main research themes and gaps. Our findings indicate that research and practices for improving the curricula of engineering courses using digital technology and active learning exist. However, these are usually in low synergy with research and practices related to Industry 4.0 and construction 4.0. Our results help researchers and other stakeholders in engineering education grasp the implications of current changes in industry and education for the alignment of undergraduate curricula of civil engineering and construction Management with 4.0 concept

关键词： construction 4.0 Education 4.0 engineering curriculum engineering education Industry 4.0 undergraduate education

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Experimental Study on the Characterisation Parameters of Shield Tunnel Single-Fluid Inert Synchronized Grouting Slurry 9

Experimental Study on the Characterisation Parameters of Shi...

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

作者： Liu, Heng Wei, Binpin Wu, Shuwei Xi, Xiaoguang Cao, Hong Wang, Zhe Zhang, Qiongfang 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 Shaoxing Transportation Construction Co. Ltd Shaoxing312099 China Hangzhou Municipal Facilities Management Center Hangzhou313099 China Huadong Engineering Corporation Limited Hangzhou311100 China

ISBN: (纸本)9781643685595

Shield tunneling technology has been widely applied in subway construction. To effectively control ground deformation, synchronous grouting behind the shield has become a crucial method and key process in shield construction. Appropriate synchronous grouting parameters are essential for guiding both theoretical research and engineering practice in shield tunneling. A series of laboratory tests were conducted to study the characterization parameters of single-fluid inert grout uplift. The relationships between synchronous grouting parameters-such as slump, consistency, buoyancy, flow index, and shear strength-were obtained. The results indicate that the flow index can serve as a characterisation parameter for grout fluidity, and the shear strength of P2.0~P2.5 with greater buoyancy variation can be used as a characterization parameter for grout uplift. In contrast, consistency and slump are not suitable as fluidity characterisation parameters. © 2024 The Authors.

关键词： representation parameters shear strength of slurry Shield tunnel slurry fluidity synchronous grout

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High performance concrete using rice husk ash

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Materials Today: Proceedings 2023年

作者： Dharmaraj, R. Dinesh, M. Sampathkumar, Saranya Haripprasath, M. Chandraprakash, V. Department of Civil Engineering KPR Institution of Technology Coimbatore India Department of Civil Engineering Sona College of Technology Salem India Veerman Construction Company Coimbatore India

The purpose of this study is to improve the High Performance Concrete (HPC) of Grade M60 by using Supplementary cementitious substance for partial substitute for Ordinary Portland Cement (OPC) and to obtain the mix design for HPC of grade M60. Additionally, it aims to assess the effectiveness of HPC that contains additional cementitious materials like rice husk ash. Concrete cubes were prepared to have a slump between 175 and 225 mm and water-powder ratio between 0.35. The type and amount of supplemental cementitious material (SCM), such as Rice Husk Ash, were among the test variables (RHA). Ordinary Portland cement was substituted with Rice Hush Ash upto 10%. The hydration properties of concrete cubes containing SCM have also been investigate in order to realize the behaviour of HPC. For the hydration properties, concrete cubes were prepared in different series such as 2.5%, 5%, 7.5%, & 10% with water - binder ratio (w/b) of 0.35 with super plasticizer. The results confirmed that Rice Husk Ash performed better than other SCM for the strength development and bulk resistivity. Finally, the best performance was obtained for 7.5% replacement of Rice Husk Ash for OPC with w/b of 0.35 with super plasticizer and the compressive strength for this mix was found to be 66 MPa at the age of 28 days. © 2024 Elsevier Ltd. All rights reserved.

关键词： High performance concrete

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From printing to performance: a review on 3D concrete printing processes, materials, and life cycle assessment

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Journal of Building Pathology and Rehabilitation 2025年第2期10卷 1-41页

作者： Mishra, Sanjeet Kumar Snehal, K. Das, B.B. Chandrasekaran, Rajasekaran Barbhuiya, Salim Sustainable Construction and Building Materials Laboratory Department of Civil Engineering National Institute of Technology Karnataka Karnataka Surathkal 575 025 India Department of Civil Engineering Motilal Nehru National Institute of Technology Allahabad Uttar Pradesh Prayagraj 211004 India Department of Civil Engineering National Institute of Technology Karnataka Karnataka Surathkal 575 025 India Department of Engineering and Construction University of East London University Way London E16 2RD United Kingdom

A paradigm shift in the construction sector has been driven by 3D concrete printing (3DCP), offering automated alternatives to conventional building methods. 3DCP enhances precision, efficiency, and consistency through robotic control and advanced printhead systems while reducing material waste and enabling design flexibility. This review examines the working principles, printer classifications (gantry-based and robotic arm-based), and operational parameters, highlighting printing speed, interlayer gap time, and nozzle size and shape as critical parameters for buildability, interlayer bonding, and extrusion quality. Their influence is discussed in relation to fresh properties (flowability, pumpability, extrudability, shape retention, and buildability) and hardened properties (compressive, tensile, and flexural strength, interlayer bonding, and durability). Mix design strategies for optimizing rheology, printability, and sustainable material selection are critically reviewed. Key durability concerns such as shrinkage, cracking, and weather resistance are addressed. Reinforcement methods, including steel bars, fibers, and embedment techniques, are also discussed. A life cycle analysis reveals that 3DCP reduces carbon dioxide emissions by up to 89.2% and construction costs by 30–40% through formwork elimination. Environmental impacts (waste generation, carbon footprint, and energy use) are assessed using regional and global data, considering embodied energy, transportation, and maintenance costs. Challenges such as regulatory hurdles, high initial investment, and the absence of standardized guidelines are identified. This review covers developments from the past decade, offering valuable insights for researchers, industry professionals, and policymakers regarding the advancements, limitations, and future directions of 3DCP. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2025.

关键词： 3D concrete printing Life cycle analysis Material selection Mix design Printing parameters Rheology

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Particle Packing Enhancement by Coupling Waste Perlite and Recycled Concrete Powders for the Ternary Blended Cement

SSRN

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SSRN 2024年

作者： Dacić, Amina Fenyvesi, Olivér Rashid, Khuram Ju, Minkwan Department of Construction Materials and Technologies Faculty of Civil Engineering Budapest University of Technology and Economics Budapest Hungary Department of Architectural Engineering and Design Faculty of Civil Engineering University of Engineering and Technology Lahore Pakistan Department of Civil and Environmental Engineering Yonsei University Seoul Korea Republic of

This investigation aimed to examine the performance of ternary blended cements by enhancing the particle packing through waste perlite powder (WPP) and recycled concrete powder (RCP) as supplementary cementitious materials (SCMs). The study evaluated the packing density and the water film thickness (WFT), which are influenced by the SCMs’ mineralogy, fineness, and morphology. Therefore, characterization of material was carried out initially, by conducting particle size distribution, chemical composition, SEM, TGA and XRD analyses. Afterwards, paste was formed into two distinct groups. The first group consists of two types of WPPs based cement, whereas for the second group, combinations of WPP and RCP are coupled with cement. Different proportions of SCMs have been used in both groups, and the compressive strength are evaluated up to 90 days. It is observed that most of the ternary blended cements have resulted in a higher packing density compared to the reference of solely ordinary Portland cement (OPC). The overall filler/occupying effect of all the used SCMs is pronounced, particularly at 28 days. A striking observation is that two types of waste powders contribute differently to the chemical activity of ternary blended cements. While WPPs exhibit pozzolanic activity, the chemical activity of RCP is recognized through the available calcium phases. Therefore, the ternary blended cements investigated result in both higher packing density and compatible compressive strength with OPC. At the end, schematic model has also been presented, which showed the mechanism of enhancing particle density. © 2024, The Authors. All rights reserved.

关键词： Compressive strength

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Movement and deformation characteristics of overlying rock mass in deep coal seam

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Journal of Mountain Science 2023年第6期20卷 1725-1741页

作者： LI Yong ZHENG Jing WANG Feng-nian HU Chao-wen YANG Fan MA Xin-gen TAO Zhi-gang College of Geoscience and Surveying Engineering China University of Mining and Technology-BeijingBeijing 100083China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology-BeijingBeijing 100083China Shanxi Provincial Transportation Technology Research and Development Co.Ltd. Key Laboratory of Highway Construction and Maintenance Technology in Loess AreaTransportation IndustryTaiyuan 030000China Huaneng Coal Technology Research Co.Ltd. Beijing 100083China State Key Laboratory for Geo Mechanics and Deep Underground Engineering China University of Mining and Technology-BeijingBeijing 100083China School of Mechanics and Civil Engineering China University of Mining and Technology-BeijingBeijing 100083China

The 110 mining method is an innovative and useful coal mining *** mainly relies on two technologies to improve coal mining rate:Top cutting and pressure relief,Negative Poisson’s ratio anchor cable(NPR anchor cable)*** study develops a large-scale physical model test using the speckle monitoring system(DIC),the stress-strain monitoring system,and the infrared thermal imaging system to deeply investigate the roadway deformation and failure law of the 110 mining method,the displacement movement mechanism of the overlying rock mass,and the change law of rock *** showed that pillarless coal mining utilizing mine pressure and rock fragmentation and expansion characteristics,the use of cut top pressure relief and NPR anchor stress compensation technology in the kilometer level of deep underground coal mining still has a positive effect along the tunnel *** addition,they can reduce surface subsidence,provide a scientific basis for ecological protection,and develop other kilometer-level deep soft rock high-ground stress underground projects.

关键词： Cut seam Displacement NPR anchor cable Physical model Numerical simulation

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Seepage field distribution and water inflow laws of tunnels in water-rich regions

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Journal of Mountain Science 2022年第2期19卷 591-605页

作者： LI Zheng CHEN Zi-quan HE Chuan MA Chun-chi DUAN Chao-ran School of Civil Engineering Chongqing UniversityChongqing 400045China Key Laboratory of Transportation Tunnel Engineering Ministry of EducationSouthwest Jiaotong UniversityChengdu 610031China Chongqing University Industrial Technology Research Institute Chongqing 401329China Chongqing City Construction Investment(Group)Co. LtdChongqing 400023China State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China School of Civil Engineering Changzhou Institute of TechnologyChangzhou 213032China

Currently,the water inrush hazards during tunnel construction,the water leakage during tunnel operation,and the accompanying disturbances to the ecological environment have become the main problems that affect the structural safety of tunnels in water-rich *** this paper,a tunnel seepage model testing system was used to conduct experiments of the grouting circle and primary support with different permeability *** influences of the supporting structures on the water inflow laws and the distribution of the water pressure in the tunnel were *** the decrease in the permeability coefficient of the grouting circle or the primary support,the inflow rate of water into the tunnel showed a non-linear decreasing *** comparison,the water inflow reduction effect of grouting circle was much better than that of primary *** the increase of the permeability coefficient of the grouting ring,the water pressure behind the primary lining increases gradually,while the water pressure behind the grouting ring ***,the grouting of surrounding rock during the construction of water-rich tunnel can effectively weaken the hydraulic connection,reduce the influence range of seepage,and significantly reduce the decline of ***,the seepage tests at different hydrostatic heads and hydrodynamic heads during tunnel operation period were also *** the hydrostatic head decreased,the water pressure at each characteristic point decreased approximately linearly,and the water inflow rate also had a gradual downward *** the action of hydrodynamic head,the water pressure had an obvious lagging effect,which was not conducive to the stability of the supporting structures,and it could be mitigated by actively regulating the drainage *** with the hydrostatic head,the hydrodynamic head could change the real-time rate of water inflow to the tunnel and broke the dynamic balance between the water pressure and water inflow

关键词： Water-rich tunnel Seepage field distribution Water inflow law construction period Operation period

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