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dynamic effect of water penetration on steel corrosion in carbonated mortar: A neutron imaging, electrochemical, and modeling study

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CEMENT 2022年 9卷

作者： Zhidong Zhang Pavel Trtik Fangzhou Ren Thilo Schmid Christopher H. Dreimol Ueli Angst Durability of Engineering Materials Institute for Building Materials ETH Zurich HCP G 31.1 Leopold-Ruzicka-Weg 4 Zurich 8093 Switzerland Laboratory for Neutron Scattering and Imaging (LNS) Paul Scherrer Institut (PSI) Villigen 5232 Switzerland Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin 150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin 150090 China Wood Materials Science Institute for Building Materials ETH Zürich Zürich 8093 Switzerland Cellulose and Wood Materials Laboratory EMPA Dübendorf 8600 Switzerland

Carbonation may potentially lead to corrosion of steel bars in reinforced concrete. This concern presents a major barrier against the implementation of sustainable low-clinker cementitious materials in the design of reinforced concrete structures. Various studies have documented the relationship between different equilibrium moisture states in carbonated concrete and the corrosion rate of the embedded steel. However, limited attempts were focused on visually observing the dynamic (time-dependent) behavior of moisture penetration into concrete and the related corrosion state and rate. Moreover, there is a lack of data on the local moisture state in the cementitious matrix in the steel-concrete interfacial zone. In this study, liquid water uptake in carbonated mortar was in-situ and over time monitored by neutron imaging. The corrosion state of embedded steel was monitored by means of electrochemical measurements. This combined experiment revealed that the arrival of the waterfront at the steel surface led to a sharp decrease of the steel potential. The corrosion rate increased from negligibly low values (<1 µm/year) to about 31 µm/year within a couple of minutes. Based on the neutron images, it is concluded that the moisture ingress through the concrete cover is locally affected by the heterogeneity of projected (depth-averaged) porosity distribution, and that large obstacles such as entrapped air have an effect. These observations were further confirmed by numerical simulation results of water transport, which also showed that liquid water permeability of the studied carbonated mortar determined by the inverse analysis is much higher than reported values in the literature. Overall, this study highlights the importance of considering the dynamic and coupled corrosion and moisture transport behavior during the periods which active corrosion can occur in carbonated concrete exposed to cyclic wetting/drying conditions.

关键词： Cement-based materials Carbonation Durability Corrosion Water imbibition Microstructure

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Research on a Technical Framework in Smart Construction Based on Big Data

Research on a Technical Framework in Smart Construction Base...

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2018 International Conference on Construction and Real Estate Management: Innovative Technology and Intelligent Construction, ICCREM 2018

作者： Han, Zixin Wang, Yaowu Dept. of Construction Management School of Civil Engineering Harbin Institute of Technology Harbin150000 China Dept. of Construction Management Key Lab of Structures Dynamic Behavior and Control Ministry of Education Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Harbin Institute of Technology Harbin China

ISBN: (数字)9780784481721

ISBN: (纸本)9780784481721

Smart construction is an important technology in the process of building a smart city. In recent years, big data has become a hot topic in the whole world. The application of big data technology in smart construction plays a significant role in promoting the construction of new urbanization. The concept and development of smart construction are introduced in this paper. The relationship between big data and smart construction is discussed based on the current development of Chinese construction industry and the difficulties encountered while applying big data technology in smart construction. Finally, the technical framework of big data technology in smart construction is also presented in this paper. © 2018 American Society of Civil Engineers.

关键词： Big data

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A Review of the Application of BIM in the Assembly Construction

A Review of the Application of BIM in the Assembly Construct...

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2018 International Conference on Construction and Real Estate Management: Innovative Technology and Intelligent Construction, ICCREM 2018

作者： Zhang, Tianqi Man, Qingpeng Dept. of Construction Management School of Civil Engineering Harbin Institute of Technology Harbin150000 China Dept. of Construction Management Key Lab of Structures Dynamic Behavior and Control Ministry of Education Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150001 China

ISBN: (数字)9780784481721

ISBN: (纸本)9780784481721

With the rapid development of computer technology and network technology, the informatization of the architecture engineering construction (AEC) industry is continuously improving. Meanwhile, BIM technology has brought a strong impetus to the development of the construction industry. However, for our country, BIM technology is still in its infancy. The application of BIM technology in the construction industry is still an important issue. Recently, the assembly construction has become the trend of the modern construction industry. By summarizing recent researches on the application of BIM technology in prefabricated building, this paper analyzes the advantages of assembly architecture and BIM technology, then explores the application of BIM technology in fabricated architecture. © 2018 American Society of Civil Engineers.

关键词： Construction industry

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Revision of bolt connection design formulae for standard GB 50005-2017 and a comparison of the lateral resistance between national design codes

Revision of bolt connection design formulae for standard GB ...

引用

2018 World Conference on Timber Engineering, WCTE 2018

作者： Niu, Shuang Wang, Xiaoting Zhu, Enchun Key Lab. of Structures Dynamic Behaviour and Control Harbin Institute of Technology Ministry of Education Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China

The current china national standard Code for design of timber structures GB50005-2003 has not been revised for over a decade, and features incapability and shortcomings for the current design practice. To facilitate the revision of the code, theoretical and experimental studies were carried out on lateral resistance of bolt connections. Formulae for the coefficient of effective dowel bearing length were derived employing European Yield Modes (EYM). Test results reveal the applicability of the formulae derived, and the fact that plasticity of the bolts is not fully developed. The resistance partial factors for design were derived so as to obtain equivalent reliability level with current design code. In terms of reliability level, a concise comparison was made between the proposed design formulae for Standard GB 50005-2017 and the European and American codes. © WCTE 2018 Committee.

关键词： Bolts

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Experimental research on the seismic performance of reinforced reactive powder concrete frame joints

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Zhendong yu Chongji/Journal of Vibration and Shock 2018年第6期37卷 149-156页

作者： Wang, Dehong Ju, Yanzhong Zheng, Wenzhong Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China School of Civil Engineering and Architecture Northeast Electric Power University Jilin132012 China

To study the seismic behavior of frame joints made of reactive powder concrete with ultrahigh strength, toughness and durability, 4 reinforced reactive powder concrete beam-column joints were tested under cyclic loads simulated seismic load conditions. The failure patterns, seismic bearing capacity, hysteretic characteristics, ductility, energy dissipating, strength and rigidity degeneration of the reactive powder concrete frame joints were analyzed. The test results show that, the shear-cracking strength of the reactive powder concrete specimens is higher, and the development of surface crack exhibits the characteristics of multiple fine cracking and a little concrete spalling, and the specimens remain as an integral whole as the loading *** strength and rigidity degeneration rates are small. The deformation capacity and energy dissipation are well. When the failure is occurring, the shear deformation is the double of that under the peak load, and the averaging equivalent viscous damping coefficient of specimens is 0.137, which is higher than the equivalent viscous damping coefficient of normal and high-strength concrete joints. The use of reactive powder concrete can improve the seismic performances of frame joints, including the shear ductility, energy dissipation capacity and so on, and reduce the stirrup ratio in joint core, which is conducive to the construction. © 2018, Editorial Office of Journal of Vibration and Shock. All right reserved.

关键词： High performance concrete

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Tensor train-Karhunen-Lo`eve expansion for continuous-indexed random fields using higher-order cumulant functions

arXiv

引用

arXiv 2019年

作者： Bu, Ling-Ze Zhao, Wei Wang, Wei School of Civil Engineering Harbin Institute of Technology Harbin150090 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prev. and Mitigation of Civ. Eng. Disasters of the Min. of Indust. and Info. Technol. Harbin Institute of Technology Harbin150090 China

The goals of this work are two-fold: firstly, to propose a new theoretical framework for representing random fields on a large class of multidimensional geometrical domain in the tensor train format;secondly, to develop a new algorithm framework for accurately computing the modes and the second and third-order cumulant tensors within moderate time. The core of the new theoretical framework is the tensor train decomposition of cumulant functions. This decomposition is accurately computed with a novel rank-revealing algorithm. Compared with existing Galerkin-type and collocation-type methods, the proposed computational procedure totally removes the need of selecting the basis functions or collocation points and the quadrature points, which not only greatly enhances adaptivity, but also avoids solving large-scale eigenvalue problems. Moreover, by computing with third-order cumulant functions, the new theoretical and algorithm frameworks show great potential for representing general non-Gaussian nonhomogeneous random fields. Three numerical examples, including a three-dimensional random field discretization problem, illustrate the efficiency and accuracy of the proposed algorithm framework. Copyright © 2019, The Authors. All rights reserved.

关键词： Tensors

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Research on Satisfaction of Building Indoor Personnel

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IOP Conference Series: Earth and Environmental Science 2020年第1期571卷

作者： Pengcheng Sun Chuanjun Yang Liangping Xu Yuanhang Guan Yanhui Wang Beijing CSCEC Engineering Consultant Co. Ltd Beijing 100037 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin 150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin 150090 China

In the operation stage, current green buildings gradually take energy conservation into consideration, a trend resulting in a phenomenon that environmental control system neglects suitability of indoor personnel. This article summarizes the advantages and disadvantages of several existing indoor thermal comfortability evaluation indicators by selectively analyzing common factors that affect personnel satisfaction, including personnel factors, indoor environmental factors, space factors, design factors, equipment factors, construction and property factors, and work factors. By combining the questionnaire to screen first-level impact factors, this article provides a basis for exploring a new multi-method-based evaluation method of intersection satisfaction.

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Basic Research on the Satisfaction of Building Indoor Personnel Based on Personnel Portrait

引用

IOP Conference Series: Earth and Environmental Science 2020年第1期571卷

作者： Liangping Xu Yaowu Wang Pengcheng Sun Chuanjun Yang Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin 150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin 150090 China Beijing CSCEC Engineering Consultant Co. Ltd Beijing 100037 China

During the operation phase, energy conservation of buildings gets much attention. controlling methods are often based on physical parameters, ignoring the specific needs of different groups of people for the environment. To evaluate the current status, the questionnaire is used to investigate the relationship between personnel comfortability and various factors. This article aims to introduce the method of personnel portraits, balance the personality and common conflicts of the crowd, and solve the control problem of comfort that varies from person to person. Finally, combined with the analysis of the results of the questionnaire, a multi-faceted study of personnel satisfaction was provided to provide a reference for methods that can achieve energy-saving and satisfaction control at the same time.

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Research on Hoisting Sequence controlling during Assembly Construction

Research on Hoisting Sequence Controlling during Assembly Co...

引用

2018 International Conference on Construction and Real Estate Management: Sustainable Construction and Prefabrication, ICCREM 2018

作者： Yuan, Zhenmin Wang, Yaowu School of Management Harbin Institute of Technology Harbin150001 China Dept. of Construction Management Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Key Lab of Smart Prev./Mitigation of Civ. Eng. Dis. of Min. Indust./Info. Technol. Harbin150090 China

ISBN: (数字)9780784481738

ISBN: (纸本)9780784481738

Due to increasingly complex structures and higher prefabrication rates, the hoisting order of precast components in fabricated buildings is gradually getting attention. During the assembly construction forbidding precast components on site, there are some influencing factors that interfere with the smooth implementation of a hoisting sequence scheme. This paper identifies and analyzes these factors through literature method, on-site investigation, and expert interview to establish an index system affecting the changes of a hoisting sequence scheme. Then, the index system is illustrated through a case, and the results show that the changes of a hoisting sequence scheme caused by transportation management are more than those caused by construction site management. Finally, this paper also discusses some influencing factors that affecting the changes of a hoisting sequence scheme in the premise of allowing precast components to be stacked on site. © 2018 American Society of Civil Engineers.

关键词： Office buildings

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Experimental study on seismic performance of reinforced concrete frame columns supported with post-build wing walls

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Open Civil Engineering Journal 2017年 11卷 82-91页

作者： Fan, Yang Ying, Wang Key Lab of Structures Dynamic Behavior and Control of the Ministry Education Harbin Institute of Technology Harbin 150090 China

Six specimens of concrete frame columns reinforced by post-build wing walls on the opposite faces were designed and fabricated to investigate their seismic performance. Axial compression ratio was considered as the critical factor and divided into 0.31, 0.36, and 0.40 before reinforcement. HRB400 steel grade was used to the longitudinal bar and the ratio of longitudinal reinforcement divided into 1.23%, 1.05% and 0.82%, stirrup reinforcement ratio was 0.6%, and the stirrups were made by HPB300 steel grade. To meet with requirement of ‘strong shear, weak bending’, the ratio of the shear span to effective depth of columns was equal to 2.4. All specimens were subjected into cyclic reversing load. The testing results showed that wing walls reinforced significantly increased the seismic bearing capacity of the specimens and the wing walls damaged seriously, but the columns were not. The limited drift was ranged from 0.021 to 0.033. The post-build wing walls under horizontal motion may dissipate energy effectively while ensuring that the existing columns without obvious damage under vertical loads and earthquake strong motion. © Fan and Ying;Licensee Bentham Open.

关键词： Anti-seismic reinforcement Axial compression ratio Concrete frame column Energy consumption Post-build wing wall

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