Wei Liang Jin

Zhejiang University | ZJU · Institute of Structural Engineering

The investigation into the influence of microenvironmental evolution, induced by calcium leaching on chloride transport in concrete in pressurized water environments, encompassed analysis of aspects such as the solid phase composition, microstructure characteristics, pH value distribution, free and total chloride concentrations using X‐ray diffract...

A numerical method considering both corrosion kinetics and ion transport is proposed to investigate the distribution of current and chloride ions in a cathodic protection system. The impact of impressed current density, concrete resistivity, chloride ion concentration, rebar arrangement, anode arrangement and thickness of protective layer on the cu...

The relationship between the pore characteristics and the chloride diffusion coefficient of mortar was investigated in this paper. Mortars with different water-cement ratios and aggregate volume fractions were prepared. The chloride diffusion coefficient was measured by the salt-saturated conductivity method (NEL). The pore size distribution was de...

A multi-physical and multi-scale analytical method based on thermo-hydro-mechanical models is adopted to evaluate the long-term deflection of RC beams with cracking under sustained loads and cyclic wet-dry conditions. The major physical-mechanical coupling mechanisms considered in this study includes: 1) water transport and phase equilibrium in the...

A six-component miniature force sensor (5 × 5 × 5 mm3) is developed using micro-fabrication and conventional precision machining technologies. High sensitivity and high stiffness are obtained simultaneously with a novel silicon sensing element design. Fair agreement between predicted and measured sensitivities is obtained.

A coupling model reflecting the interaction between freeze–thaw cycles (FTCs) and alkali–silica reactions (ASRs) is established from the microscale to the macroscale under the consideration of non-uniform environmental and mechanical conditions. At both material and structural levels with/without reinforcement, the deformation and damage patterns o...

Fatigue-damaged concrete improves the load-bearing capacity of components by increasing the cross section. However, the creep performance of damaged components after the repair has received less attention. Thus, this study establishes a constitutive creep model of strengthened fatigue-damaged concrete on the basis of damage mechanics and numericall...

Chloride-induced corrosion of marine reinforced concrete structures involves numerous uncertainties related to environmental exposure zone. The exposure zone is strongly correlated with surface chloride content, which exhibits significant spatiotemporal variability. In this study, the scale of fluctuation of the chloride content in different exposu...

The ACI440.2R and other codes advice that the concrete can reach the compressive strain of 0.003 and there is no FRP debonding at the ultimate limit state of FRP-strengthened RC beams. However, many flexural tests have shown that intermediate crack (IC) induced debonding is the main failure mode of FRP-strengthened RC beams and the ultimate compres...

As a hallmark for inflammatory bowel disease (IBD), elevated intestinal epithelial cell (IEC) death compromises the gut barrier, activating inflammatory response and triggering more IEC death. However, the precise intracellular machinery that prevents IEC death and break this vicious feedback remains largely unknown. Here, we report that Gab1 expre...

Concrete-to-concrete interfaces present both in new and existing construction, are commonly regarded as the weak link. Durability research of interfaces is a vital prerequisite for structural rehabilitation and strengthening applications under marine and coastal environments. Hence, to clarify the chloride ion transport behavior between the new-old...

To avoid strains in steel structures in special equipment caused by excessive alternating loads, which cause stress concentrations in local areas and reduce the strength and pressure-bearing capacity of the steel structures, a method for evaluating the strain state of the steel structures using the eddy current effect is proposed, and the relevant...

The development of cracks in reinforced concrete structures can accelerate structural deterioration and reduce service life. A numerical model was established to analyse steel bar corrosion in chloride-contaminated concrete with transverse cracks. In the model, the dynamic distinction between anode and cathode regions on the steel surface is consid...

This study aims to investigate the time-dependent direct current (DC) resistivity of cement-based materials considering various influential factors. Results show that a decreasing water-cement ratio, saturation degree, ion concentration and applied voltage, or an increasing curing age and amount of aggregate will lead to an increasing resistivity....

In this paper, structural systems reliability analysis was used to estimate the system reliability of a typical semi-submersible based on the characteristic structure failure mechanisms under extreme wave loads. First, a three-dimensional simulation model was created for the chosen semi-submersible platform using an elastic-perfectly plastic materi...

The present experimental and analytical study conducted a 710-day creep experiment on high-performance concrete(HPC) with a loading period of 45–260 days. The effects of the loading period on the shrinkage, elastic modulus, and creep of HPC, as well as the deviation from the prediction results of the ordinary concrete model, were examined. The resu...

A UHPC bridge deck joint structure is proposed herein in order to meet the requirements for the rapid construction of a multi-span concrete simply-supported T-beam bridge and long-term stress resistance of the bridge deck joint structure. Particular consideration is paid to the reasonable selection of high-performance materials to ensure the durabl...

Compared to natural sand, manufactured sand (M-Sand) has significant differences in terms of stone powder content, particle size distribution, and particle shape. The fatigue performance of M-Sand concrete structures is a crucial problem for the application of M-Sand in significant engineering structures. In this study, four different types of fine...

To solve the problem of durability deterioration of cracked concrete structures in coastal environments, this study investigates the effect of repairing loading cracks and corrosive cracks. In particular, the immediate and long-term effects of combining electrochemical repair technology with traditional repair methods were studied. After the repair...

The cement manufacturing industry, a resource- and energy-intensive sector, took up more than 15% of total greenhouse gas emissions in China, thus finding a clean technology option for sustainable development is essential. CO2 curing has emerged as a promising novel method for large-scale carbon sequestration and mechanical properties improvement o...

A nitrogen (N), oxygen (O)-rich porphyrin-based covalent organic framework (COF), in which interlayer porphyrin molecules are vertically stacked, is prepared and characterized. As-prepared N,O-rich TpTph COF shows a high adsorption capacity for Cd²⁺ due to the abundant coordination sites. More interesting, it is found that the formation of COF enla...

This paper focuses on the spatial characteristics of reinforcing-bars corrosion under stray current. In the study, a corrosion experiment using a specimen with three steel bars embedded in pseudo concrete was carried out, the distribution of corrosion was obtained by three-dimensional scanning. Further, a numerical model with the same dimension of...

Adsorption is a cheap, energy-efficient, and easy-to-operate method for heavy metal pollution treatment. As highly porous and crystalline polymers, covalent organic frameworks (COFs) hold great promise as the adsorbents of metal ions. Herein, two hydroxyl-functionalized porphyrin COFs (2,3-DhaTph and 2,5-DhaTph) were synthesized, characterized and...

The random distribution of aggregates plays a key role in the variation of steel corrosion morphology in chloride-contaminated RC structures. The purpose of this study is to investigate the influence of random aggregate distribution on the regularity and variability of steel corrosion morphology through probabilistic analysis based on numerical sim...

For prefabricated concrete structures constructed by the wet joining process, appropriate damage indicators need to be adopted to characterize fatigue damage development considering the effects of interface damage. In this study, through the cyclic load testing of 12 prefabricated concrete composite beam specimens with three different cross-section...

Current studies have shown that using magnetic field change around the ferromagnetic material to characterize the fatigue damage is very effective, but researches on using metal magnetic memory (MMM) technique to detect fatigue damage are mostly limited to the material level. There are few studies on the mechanism of the magnetic signal change or n...

For chloride-contaminated reinforced concrete (RC) structures, sacrificial anode cathodic protection (SACP) is an effective method to control steel corrosion. However, some adverse phenomenon, such as insufficient protection current or excessive anode consumption, might affect system operation. The motivation of this work is to optimize SACP system...

In this study, mode-I high-cycle fatigue tests were conducted on smooth standard specimens manufactured from HRB400 steel bars, prefabricated with a semi-ellipsoid corrosion pit. Fatigue crack growth (FCG) behavior was predicted using the FCG model, based on linear elastic fracture mechanics (LEFM). During the fatigue process, an online piezomagnet...

Shear transfer at concrete-to-concrete interfaces under direct shear is of great significance to the performance of concrete structures. In this study, a series of direct shear specimens with concrete-to-concrete interfaces were designed by considering the normal pressure, longitudinal reinforcement, and coupling effects. Adding reinforcement or no...

Social dimensions, as one of the three pillars of sustainability, are commonly not fully considered in the planning, bidding, and design processes of construction projects, primarily due to a lack of standardized estimation methods. Despite the potential economic and social benefits of these projects, they may lead to various negative social impact...

There are a large number of concrete bonding interfaces in assembled concrete structures. Moreover, the problems of deformation and coordination at the interfaces lead to weak bonding under shrinkage and creep. The theoretical methods and analytical solutions for the long-term performance of composite structures in recent literatures are relatively...

Structural reinforced concrete (RC) experiences cyclic loads during their service life, and in practice, the load amplitude can always change, which will lead to a mixed high and low‐cycle fatigue failure. This paper aims to investigate the fatigue behaviors of RC beams under different load levels and more importantly, their sequential effects. Bas...

In order to study the effect of Bidirectional Electromigration (BIEM) in cracked coastal concrete, the influence of the relative position and width of a crack on chloride removal and corrosion inhibition was ascertained through numerical simulation and experimental research. The results showed that, in the power-on state, the current in the crack w...

As a ferromagnetic material, the magnetization of ribbed steel bars will change with the development of fatigue damage under cyclic loading, which can be used to evaluate the fatigue damage state of steel bars. However, the quantitative relationship between fatigue damage and the variation in magnetization is still unclear, and the existing magneto...

Generally, the fatigue failure of reinforced concrete beams under the coupled action of fatigue and corrosion is mainly controlled by the brittle fracture of the steel bar, confirming the significance of the fatigue crack growth (FCG) behavior of the steel bar. In this regard, FCG tests of opening mode I were conducted based on standard compact spe...

Steel bars in concrete structures can become severely corroded in chloride salt-containing environments, which can shorten the service life of the structure. Bidirectional electromigration rehabilitation (BIEM), a novel type of durability repair technology used on reinforced-concrete (RC) structures experiencing chloride corrosion, involves applyin...

Electrochemical rehabilitation (ER) techniques usually serve as non-destructive methods for addressing the durability hazards of reinforced concrete (RC) structures and for effectively improving their durability. However, the bond damage induced by ER can detrimentally impact the fatigue stiffness of the RC beams. To investigate the effects of ER o...

Porosity evolution caused by electrochemical chloride removal (ECR) process can affect the transport behaviour of concrete and vice versa. The main task in this investigation is to quantitatively understand the porosity evolution effect on ECR process, and find a more accurate model that gives good correlation with the experimental results concerni...

Concern has been expressed in the recent decades about the corrosion prediction of concrete structures in a chloride environment. This paper summarises the corrosion prediction models developed for chloride-contaminated concrete, including both the empirical and electrochemical corrosion models. The definition methods of the steel de-passivation pr...

Bidirectional electromigration rehabilitation (BIEM) technology is a novel method to improve the durability of existing reinforced concrete structures. BIEM repair effects are proportional to operation time, which is applied during the process of different durability degradation of concrete structures. In this paper, three different durability dete...

Bidirectional electromigration rehabilitation (BIEM) is a novel electrochemical rehabilitation method involving the injection of inhibitors into steel bar surface. The BIEM effect and hydrogen embrittlement (HE) risk depend on the electrochemical parameters (current density and duration) and operating condition (stress level and concrete cover thic...

Silane impregnation is a widely used surface protection method in practical engineering for enhancing the durability performance of concrete structures in chloride rich environments. Here a probabilistic model, together with the statistical properties of model parameters, is proposed, to determine the service life extension effect contributed by th...

Chloride ion is one of the most important factors leading to the corrosion of steel bar embedded in marine concrete structures. The chloride induced corrosion is also considered harmful to the service life and durability of structures. Electrochemical chloride removal (ECR) is a nondestructive method, which can be used to terminate the corrosion an...

This paper combines Zheng-Liu (Z-L) model and modified Jiles-Atherton-Sablik (J-A-S) model to propose a magnetomechanical model, to investigate the relationship between the fatigue damage of the steel bar and the surface magnetic memory signal, and to analyze and predict the variation trends of the magnetization of steel bar subjected to cyclic loa...

The research presented here investigated the relationship between piezomagnetic signals and fatigue damage in ribbed steel bars. Two groups of HRB400 ribbed steel bars were separately tested using either uniaxial static or cyclic tensile loading. Subsequent piezomagnetic signals were recorded in real-time. Results demonstrated that there was a rela...

Anchorage systems have been proven to efficiently prevent or postpone debonding of reinforced concrete structures strengthened in flexure with fiber‐reinforced polymer (FRP) laminate or sheet. Although extensive studies on the effect of anchorage systems on intermediate crack debonding and end debonding of strengthened members have been performed,...

Electrochemical rehabilitation (ER) techniques are very efficient and non-destructive methods to improve the durability of existing concrete structures. However, the induced bond damage between steel bar and concrete will affect the mechanical properties. In order to investigate the effect of ER on the static mechanical properties of concrete struc...

This paper describes the corrosion process of reinforcing steel under both chloride attack and mechanical loading. Molecular dynamics simulation is adopted to investigate the evolution process of passive film and oxidation process of reinforcement. The mean square displacement and self-diffusion coefficient of O2 under different conditions are also...

Steel bars embedded in reinforced concrete are vulnerable to corrosion in high chloride environments. Bidirectional electromigration rehabilitation (BIEM) is a novel method to enhance the durability of reinforced concrete by extracting chloride out of concrete and introducing an inhibitor to the surface of the steel bar under the action of an elect...

Corrosion is one of the main reasons for the degradation of reinforced concrete structures, especially of those exposed to a chloride-contaminated environment. To study the effect of chloride ions on the corrosion of steel embedded in concrete, two electrochemical parameters, namely, the anodic Tafel slope and potential, were theoretically analyzed...

Bidirectional electro-migration rehabilitation (BIEM) is type of electrochemical rehabilitation that allows for simultaneous chloride ion removal and inhibitor injection into the steel bar surface. The inhibitor migrates across the surface of the steel bar, altering its pH and forming a thin layer of isolation that reduces hydrogen evolution. In th...

Chloride-induced corrosion is widely accepted as one of the primary causes of premature deterioration for concrete structures in marine or deicing salt environment. For precast concrete (PC) structures, such durability problems may even be severer because defects in joint areas, e.g., cracks caused by grout shrinkage and improper construction, can...

Civil engineering structures can induce various environmental problems during their lifetime. In this paper, the life-cycle environmental impacts of structures, including the emissions to air, water and land, are quantified by environmental cost, and are considered as a part of indirect cost in the life-cycle cost (LCC) model. The computation of en...

Environmental temperature varies significantly with place and time and therefore affects the efficiency of electrochemical chloride removal (ECR) treatment on reinforced concrete structures. To find the appropriate temperature for ECR application in real structural elements, exposure of concrete to ambient temperatures −10, 0, 20, and 50 °C were se...

Unreinforced and reinforced masonry components from Code for Design of Masonry Structures (GB 50003-2011) were analyzed in order to illustrate the influence of load partial factor adjustment on safety level and material consumption of the masonry structures in the draft of Unified Standard for Reliability Design of Building Structures (GB 50068). T...

Monitoring the entire process of concrete corrosion is critical for assessing the remaining life of the structure and determining if maintenance is needed. In this study, the long-distance embedded optical fiber sensor (LEOFS) and the embedded corrosion optical fiber sensor (ECOFS) were both embedded to form a smart reinforced concrete beam that co...

The fatigue flexural performance of RC beams attacked by salt spray was studied. A testing method involving electro osmosis, electrical accelerated corrosion and salt spray was proposed. This corrosion process method effectively simulates real-world salt spray and fatigue loading exerted by RC components on sea bridges. Four RC beams that have diff...

Current structural design methods mostly emphasize the short-term structural behavior while neglect the long-term performance, social effects and environmental impacts. To address these problems, the Life-Cycle Design (LCD) method considering environmental impacts and structural deterioration could be adopted within the design process to ensure tha...

Concrete cover separation is one of the premature debonding failure modes commonly observed when strengthening reinforced concrete (RC) beams that use externally bonded fibre-reinforced polymer (EB-FRP) become delaminated. Anchorage systems, which postpone or prevent debonding, have proven to be an effective method to achieve higher levels of FRP u...

In order to improve pouring quality and durability of concrete for connect construction between corrugated steel webs and concrete lower slab, placing lower slab on the inner side of corrugated steel webs and the connect construction with perforated plate connectors were proposed. Pushout tests with different parameters including the welding width,...

This paper investigated the cracking behaviour and flexural capacity of beams under simultaneous sustained loading and steel corrosion. Chloride ions were electro-migrated into the concrete beams, and then DC current, coupled with wetting and drying cycles, was applied to accelerate the steel corrosion. During the steel corrosion, the beams were su...

This study aims to explore the durability issues regarding chloride ion corrosion of concrete structures, and further investigates the modified supplementary cementitious material (MSCM) which acts as a significant enhancer of performance of mortar and concrete. The composition of MSCM includes mineral slag powder, fly ash and inhibitor. The micros...

Polyethylene terephthalate (PET) fiber-reinforced polymer (FRP) composites are characterized by a large rupture strain (LRS) (usually larger than 5%) but a low elastic modulus compared to conventional FRP materials made of carbon, glass, and aramid fibers. Previous studies have proved that the use of PET FRP sheets as jacketing materials for plain...

Axial tensile fatigue tests of seventeen standard specimens machined by HRB400 hot-rolled bars were carried out and the piezomagnetic signals nearby them were real-timely recorded to analyze the evolution of piezomagnetism in fatigue of process. The experimental results demonstrate that the piezomagnetic signals of HRB400 bars are sensitive to fati...