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2024 International Conference on Cloud Computing and Big Data, ICCBD 2024

作者： Liu, Yuanhui Yang, Changhong Zheng, Lifei Zhong, Zhiying Yu, Wenbo Guangzhou Nansha New Area Mingzhu Bay Development and Construction Management Bureau China Construction Co. Ltd. China School of Civil Engineering Architecture and Environment Hubei University of Technology China

ISBN: (纸本)9798400710223

Addressing issues such as low efficiency in inter-departmental collaboration, difficulty in data sharing, and poor management levels in tunnel operation and maintenance, this study explores the possibility of enhancing management capabilities using intelligent technologies. By establishing an intelligent system for tunnel operation and maintenance management based on BIM, GIS, and IoT technologies, this research analyzes the support layers of technology, data, and applications of the system, highlighting its key role in routine maintenance, safety inspections, and accident prevention. Through case studies, corresponding solutions are proposed. The study has concluded that the construction and operation of intelligent tunnel systems can significantly improve the efficiency and safety of urban management and contribute to the sustainable development of urban underground spaces. © 2024 ACM.

关键词： Efficiency

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Benefits Realization Management of Computer Vision in construction:A Missed,Yet Not Lost,Opportunity

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engineering 2023年第8期27卷 11-13页

作者： Peter E.D.Love Jane Matthews Weili Fang Hanbin Luo School of Civil and Mechanical Engineering Curtin UniversityPerthWA 6845Australia b School of Architecture and Built Environment Deakin University Geelong Waterfront CampusGeelongVIC 3220Australia Department of Civil and Building Systems Technische Universität BerlinBerlin 13156Germany National Center of Technology Innovation for Digital Construction Huazhong University of Science and TechnologyWuhan 430074China School of Civil Engineering and Mechanics Huazhong University of Science and TechnologyWuhan 430074China

*** While the applications of computer visions are varied in construction,research has tended to focus on measuring the accuracy of object detectors such as faster region-based-convolution neural networks(Faster R-CNN)and single shot detector algorithms(SDD)[1].Limited,if any,attention has focused on determining the benefits of such technology in construction beyond the claims that it can help detect problems quickly and *** this point are the numerous review papers that have frequented the literature[2,3].

关键词： faster Management benefits

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An analytical analysis for the mechanical performance of fully-grouted rockbolts based on the exponential softening model

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International Journal of Mining Science and technology 2022年第5期32卷 981-995页

作者： Zhongwen Yue Akang Li Peng Wang Peng Wang Department of Mechanics and Civil Engineering China University of Mining and Technology-BeijingBeijing 100083China Pan-China Construction Group Co. Ltd.Beijing 100070China

This paper presented a novel bond-slip model to better reveal the mechanical behavior of the bolt-grout interface for fully-grouted rockbolts under tensile loads by considering the non-linear response in the softening *** exponential decay function is adopted for describing the non-linear response in the softening *** on the improved bond-slip model,the corresponding analytical solutions for the interfacial shear stress and the axial force of the bolt under different loading stages are ***,the validity of this proposed model was verified by comparing with the experimental *** results show that compared with the linear softening model,the proposed model is more suitable for predicting the mechanical performance of fully-grouted ***,a series of parametric studies are conducted to explore the effect of model parameters on the mechanical properties of fully-grouted *** results indicate that compared with the anchor length,the bolt diameter and the bond strength of the bolt-grout interface have a significance influence on the ultimate load of bolt,especially for the elastic and softening ***,it can be found that using the linear softening model maybe overestimates the supporting performance of grouted bolt,resulting in an unsafe design for bolt.

关键词： Fully-grouted rockbolts Non-linear response Bond-slip model Anchor length Analytical solutions

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Analysis of Two Kinds of Rheological Properties Data of Asphalt 7

Analysis of Two Kinds of Rheological Properties Data of Asph...

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7th International Conference on civil Architecture and Structural engineering, ICCASE 2023

作者： Chen, Chengxin Lin, Hui Li, Zixia Construction Technology Development Co. Ltd Development and Application of new Building Materials 350000 China Civil Engineering Construction Honghui Construction Engineering Co. Ltd Municipal Road Construction 350000 China State Grid Harbin Power Supply Company 150000 China

ISBN: (纸本)9781643684123

In order to study the rutting factor G*/sin δand complex shear modulus G*, two kinds of rheological performance data obtained under asphalt temperature scanning, this paper performs regression analysis on the relevant empirical formulas of these two kinds of data, using the determination coefficient R2 and the comparison of the numerical magnitude of the fitted and true values of the regression against the error value N, and selects a reasonable formula for the next analysis and research, and uses a small number of known measurement point data of two different temperature spans for regression analysis, and compares the numerical magnitude of N, so as to discover and analyze the *** results show that the fitted and true values of the commonly evaluated formula: lg lg G∗ = GTSF b lg T + C2 for the complex shear modulus G∗ have relative error values E of many data above 6.4%, which do not meet the specification requirements, but the Z as well as X of the formula lg(F) = A b T + C (F can refer to G∗/sin δor G∗) under the regression of the same data are below 6.4%, which are more satisfying to use for research;At the same time, using Equation lg(F) = A b T + C in the commonly used asphalt high temperature evaluation interval (50-80) for a deeper research analysis, it was found that a number of data in Δobtained by regression analysis using three known measurement points with a temperature span of 15°C (50°C, 65°C, 80°C) were more than 6.4%, which did not meet the specification requirements;while using four measurement points with a temperature span of 10°C (50°C, 60°C, 70°C, 80°C) are all below 6.4%, which meet the specification requirements. © 2023 The Authors.

关键词： Errors

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The effect of Polynaphthalene Sulfonates on the mixture composed of Air-entraining cement and fine sand with a maximum size of 600 micron

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Materials Today: Proceedings 2022年 62卷 4267-4270页

作者： Hussein, Farah M. Altai, Saif Al-Chalabi, Saeb F. Civil Engineering Department Engineering College Mustansiriyah University Baghdad Iraq Building and Construction Technology Engineering Department Al-Mustaqbal University College Hillah Iraq Department of Water Resources Engineering Mustansiriyah University Baghdad Iraq

This study provides a new mixture using Poly Naphthalene Sulfonates (PNS) to improve the compressive strength, density, and flowability. An experimental study was conducted to study the effect of PNS on mixtures composed of air-entraining cement, fine sand with a maximum size of 600 µm, and low water content, the water to cement ratio was 0.3. The effect of PNS was evaluated based on three characteristics, namely the compressive strength, the density, and the flowability. Four different dosages of PNS (0.0%, 2.5%, 3.5%, and 4.5%) (g/g) of cement weight were used. The results showed that the more PNS dosages were added, the higher compressive strength, density, and flow became. The first mixture without PNS dosages (control mixture) showed no sign of flow resulting in the lowest density and strength among other mixtures. By adding (2.5%, 3.5%, 4.5%) of PNS dose, described as a gram of the superplasticizer to gram of cement, to the control mixture, the compressive strength increased by (58%, 69%, and 70%) compared to the control mixture, and the density increased by (7%, 12%, and 16%) and the flow diameter increased by (17%, 41%, and 52%), respectively. Adding PNS with air-entraining cement can significantly increase the workability, density, and compressive strength altogether. Increasing the compressive strength to above 20 MPa and reaching to 24 MPa may refer to the consent of this combination, PNS and air-entraining cement. To overcome the high-water demand of highly fine sand mixtures made with low water content, water surface tension can be diminished but with no ability to air-entraining or with no ability to retain air-bubbles that may be entrained. © 2022 Elsevier Ltd.

关键词： Compressive strength

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Analysis of influencing factors of construction safety of prefabricated buildings based on Fuzzy-ISM and MICMAC 4

Analysis of influencing factors of construction safety of pr...

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4th International Conference on Smart City engineering and Public Transportation, SCEPT 2024

作者： Zhao, Yanqing Li, Yan Li, Qiu Civil Engineering School University Sains Malaysia Engineering Campus Penang14300 Malaysia School of Business Beijing Institute of Technology Guangdong Zhuhai519088 China School of Mechanical and Electrical Engineering Guangzhou City Construction College Guangzhou510925 China

ISBN: (数字)9781510679825

ISBN: (纸本)9781510679818

As a new building production mode, the construction method of prefabricated buildings is quite different from that of traditional buildings, and the construction safety management at each stage is more difficult. In order to reasonably analyze the relationship between the construction safety risks of prefabricated buildings, this paper identifies 5 types of 26 risk factors, and builds a multi-level hierarchical structure model of construction safety risks of prefabricated buildings based on Fuzzy-ISM. And MICMAC is used to calculate the driving force and dependence of each risk to classify the risk. It provides some reference for the identification, analysis, evaluation and early warning of the key risks in the construction management of prefabricated buildings. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Risk assessment

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Study on Factors Affecting the Compressive and Flexural Strength of the Geopolymer Paste using the Wet Mixing Method 10

Study on Factors Affecting the Compressive and Flexural Stre...

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10th Annual International Conference on Material Science and Environmental engineering, MSEE 2022

作者： Wang, Kai Chen, Dejing Gao, Yuting School of Civil and Environmental Engineering Harbin Institute of Technology Shenzhen Guangdong Shenzhen China Shenzhen Construction Engineering Group Co. Ltd Guangdong Shenzhen China

The paper investigates the 28 days compressive & flexural strength of the fifty-seven geopolymer paste specimens using the wet mixing method. The completely decomposed granite (CDG), combined with the slag were chosen as the sources of silicon and aluminum components. Types of the alkali solutions, the slag content, modulus and concentration of the alkali solutions, along with the liquid-solid ratio, were chosen as the variables. Influences of the parameters on the mechanical behavior of the geopolymer paste are discussed in the paper. © Published under licence by IOP Publishing Ltd.

关键词： Geopolymers

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Site observations of weathered granitic soils subjected to cementation and partial drainage using SCPTU

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Journal of Rock Mechanics and Geotechnical engineering 2023年第4期15卷 984-996页

作者： Xianwei Zhang Xinyu Liu Ran An Xinming Li State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China College of Urban Construction Wuhan University of Science and TechnologyWuhan430065China School of Civil Engineering and Architecture Zhongyuan University of TechnologyZhengzhou450007China

Because of the cementation inherited from the parent rock,weathered granitic soil is usually susceptible to disturbance,which poses considerable challenges for laboratory *** cone penetration test with pore pressure measurements has long been known for its reliability in site investigations and stratigraphic ***,although extensive piezocone test results and experience are available for sedimentary soil,similar advances are yet to be made for weathered granitic ***,the experience from sedimentary soil may not be directly applicable to weathered profiles because of the essentially different natures of the two types of *** study performs seismic piezocone tests in a weathered granitic profile comprising residual granitic soil,completely weathered granite,and highly weathered *** pressure is measured at both the cone mid-face and the shoulder,and the effects of penetrometer size and penetration rate are considered.A series of updated soil behavior type charts is proposed to interpret the test results,thereby allowing the effect of weathering to be *** paper offers an important extension to the sparse data on the in situ responses of weathered materials.

关键词： Weathered granite Seismic piezocone test Cementation Soil classification Pore pressure Weathering degree

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Evaluation of Early-Age Cracking in Arch Feet of PC Girder-CFST Arch Rib Composite Bridge 4th

Evaluation of Early-Age Cracking in Arch Feet of PC Girder-C...

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4th International Conference on Advanced Technologies for Humanity, ICATH 2022

作者： Huang, Xu Zhong, Huaqian He, Shaohua Mosallam, Ayman S. Agwa, Ashraf Abdelkhalek School of Civil & Transportation Engineering Guangdong University of Technology Guangdong Guangzhou China Department of Civil & Environmental Engineering University of California IrvineCA United States Department of Structural Engineering and Construction Management Future University in Egypt Cairo Egypt

ISBN: (纸本)9783031474309

The prestressed concrete (PC) girder-to-concrete filled steel tubular (CFST) arch composite bridge has increasingly become popular in recently constructed railway bridges. The CFST arch feet connecting the PC girder and CFST arch rib are commonly cracked during bridge construction. This paper performs experimental and numerical studies on CFST arch feet to uncover the reasons behind the early-age cracking of the arch feet’ concrete. Firstly, the prototype bridge was briefly introduced, and a finite element (FE) model using beam element was established to determine internal forces at the arch feet. Then, a solid FE model was established for the arch-to-girder joint structure, and the procedure of hydration heat for the CFST core concrete was simulated and presented. The accuracy of the solid model was calibrated using the experimental results obtained from the arch feet of the actual bridge. Critical factors that cause tensile stress in the concrete abutment are determined based on the results. It shows that concrete hydration heat caused significant temperature differences between the CFST core and abutment concrete, triggering large tensile stress in the concrete arch feet. The maximum tensile stress measured at the abutment surface was 2.3 MPa on average, which was beyond the concrete cracking strength. Furthermore, recommendations for lowering the risk of concrete cracking are suggested. The outcome of this study is supposed to provide a reference for optimizing the early-age cracking performance of CFST arch feet (CFSTAF) in PC girder-to-CFST arch composite bridges. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Arches

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Experimental Study of the Microstructural Characterization of Microbial Induced Calcite Precipitation (MICP) Bio-Cement Concrete

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Iranian Journal of Science and technology - Transactions of civil engineering 2024年第2期49卷 1193-1209页

作者： Hareru, Werku Koshe Hailu, Surafel Mekonnen, Eshetu Department of Construction Technology and Management School of Civil Engineering and Architecture Institute of Technology Dire Dawa University Dire Dawa 1362 Ethiopia College of Natural and Computational Sciences Dire Dawa University Dire Dawa Ethiopia

Microbial-induced carbonate precipitation (MICP), a bio mineralization technology facilitated by bacteria, has been a prominent research topic for scientists and engineers over the past few years as a multidisciplinary method. In the present study a MICP was studied using bio-cement solution in conventional concrete, enhancing its performance without adding extra cement. Tests on workability, compressive strength, splitting strength, flexural strength, water absorption, and permeability were conducted. The results revealed that 60% bio-cement improved compressive strength, tensile strength, flexural strength, and permeability depth by 33.7%, 12.4%, 12.4%, and 46.7%, respectively. To justify the improvement, the internal structure of concrete was studied at microscopic level through Scanning Electron Microscopy (SEM), X-ray Diffraction Analysis (XRD), and Fourier Transformed Infrared Spectroscopy (FTIR). These tests provided valuable insights into the composition and properties of bio-cement concrete, which can be used to evaluate its performance and durability. SEM analysis showed that the addition of 60% bio-cement solution enhances the microstructure of concrete, resulting in fewer and smaller cracks, a denser Interfacial Transition Zone (ITZ), a homogeneous distribution of active and inactive concrete ingredients, and reduced pore voids. Furthermore, XRD and FTIR analyses indicated that integrating 60% MICP bio-cement into the concrete mix facilitates the formation of essential components, such as calcium silicate hydrate (C–S–H) gel, Silica (quartz), calcium aluminosilicate hydrate (C–A–S–H), calcite (CaCO₃), portlandite, and ettringite. From the study it was concluded that, the microstructural tests with 60% bio-cement solution exhibits fewer air voids, and greater structural integrity. Therefore, a 60% bio-cement solution is optimal, enhancing the compressive strength, splitting tensile strength, flexural strength, and durability properties of the c

关键词： Bacteria Bacterial Bio Calcite Cement FTIR Induced Precipitation (BICP) SEM Ureolytic XRD

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