E. Chen's research while affiliated with Chalmers University of Technology and other places

Publications (44)

Article
Full-text available
The edge beams of reinforced concrete bridges with de-icing salts sprayed experience extensive corrosion damage. The average service life of edge beams needing replacement in Sweden has been reported as only 45 years, causing great economic loss to both owners and users. Hence, finding a durable solution for edge beams would benefit society. Hybrid...
Chapter
This paper presents experimental results of corrosion pattern and tensile behaviour of corroded rebars extracted from 4 uncracked and 18 pre-cracked plain concrete and fibre reinforced concrete (FRC) beams. The beams were pre-cracked through three-point bending to a target maximum crack width of 0.1 and 0.4 mm, and then subjected to natural corrosi...
Article
Full-text available
Corrosion of reinforcement in concrete impairs the mechanical behaviour of rebars by decreasing their strength and deformation capacity. In this study, uniaxial tensile tests were carried out on 61 rebars taken from 22 pre- and un- cracked reinforced concrete beams subjected to drying and wetting cycles in chloride solution for over three years. A...
Article
Full-text available
This paper presents results on corrosion characteristics of 66 rebars extracted from un- and pre-cracked plain concrete and fibre-reinforced concrete (FRC) beams suffering from corrosion for more than 3 years. The influences of fibre reinforcement, flexural cracks, corrosion-induced cracks and loading condition on the maximum local corrosion level...
Article
The lack of systematic evaluation on the feasibility of fabricating solderable coatings through a hot-dipped tinning process restricts the increasing applications of this process in the electronics industry. In this paper, the temperature-dependence, wettability, thermal stability, and microstructure of solderable Sn coatings produced by hot-dipped...
Article
Full-text available
A microstructure model combined with diffusion-based mechanism is recon- structed. The objective is to propose a model that could describe the long-term microstructure evolution driven by certain physical mechanisms. With modifi- cations in parametric control, the introduced kinetics is extended to directly consider the particle size distribution (...
Article
In this study, a microstructure-based homogenization method is proposed for the creep behavior of cement paste at early age. With the aid of hydration model, the evolution of microstructure in hydrating cement paste is represented as a function of time. The inherent creep of C-S-H is characterized by the B3 creep model proposed by Bazant, whereas o...
Article
https://doi.org/10.1016/j.jclepro.2018.08.281 Low heat Portland (LHP) cement is one type of low energy and emission cement. In this work, the abrasion resistance, heat releasing properties, shrinkage behavior and pore structures of LHP cement-based materials are comprehensively investigated, and compared with those of moderate heat Port-land (MHP)...
Article
https://doi.org/10.1016/j.conbuildmat.2018.08.056 This is my article and has been falsely claimed by others in Researchgate and Google Scholar.
Article
Considering of the limitations of existing hardware sensors in quantitatively evaluating of rebar corrosion degree, a novel non-contact capacitive transducer (CT) as an alternative hardware sensor, which can directly determine the rust layer thickness, is being developed the first time for corrosion detecting. To help the design and experimental pl...
Article
The moving least-square (MLS) method has been popular applied in surface construction and meshless methods. However, the moment matrix in MLS method may be singular for ill quality point sets and the computation of the inverse of the singular moment matrix is difficult. To overcome this problem, a regularized moving least-square method with nonsing...
Article
This paper is mine, but claimed by others. Low heat Portland (LHP) cement is one type of environmental-friendly cements with low energy consumption. A case study of Baihetan dam in this work demonstrates that replacing Portland cement (PC) by LHP cement can lead to about 83,770 GJ of energy saving. The present study investigates the thermal and me...
Article
This paper presents a preliminary work to evaluate the thermal resistance of a spherical medium. In the sphere, a three-dimensional pore fractal network combined with electrical double layers is constructed to represent the pore structure of medium. The construction and structural parameters of a network are illustrated in detail. The thermal resis...
Article
https://doi.org/10.1016/j.matlet.2018.01.077 Utilization of low heat cement is an effective way to decrease the cracking risk in mass concrete. This paper investigates hydration, mechanical property and calcium silicate hydrate (C-S-H) structure of early-strength low-heat Portland (ESLHP) cement-based materials. Due to the low content of C 3 S and...
Article
A numerical method based on the boundary integral equation is proposed for the point location problem. For a bounded domain, the integral value is close to 1.0 if a point is inside the domain, and is close to 0.0 when the point is outside the domain. For convenience of integration, the boundary of the domain can be discretized into boundary integra...
Article
This paper reviews the evaluation of hydration of cement-based materials by means of electrical methods from the view point of direct and alternative current methods. The merits, demerits and application scenarios of electrical methods for hydration characterization are described. Influencing factors (pore solution conductivity, porosity, pore size...
Article
http://dx.doi.org/10.1016/j.compositesb.2017.07.058 The effects of silica fume, PVA fiber and their combinations on the mechanical properties, microstructure, abrasion resistance and volume stability of cement pastes and/or fly ash concrete were studied experimentally in this work. The results indicated that the compressive strength and tensile st...
Article
Full-text available
Percussive-rotary drilling is an effective method for the hard rock drilling. As hydraulic and pneumatic hammers have many problems especially in the deep core drilling, a new electromagnetic hammer driven by a tube linear motor is introduced in this study. The study mainly covers the mechanical structure and electromagnetic design of the hammer, r...
Article
This paper presents a preliminary work to evaluate the electrical impedance of three-dimensional pore fractal networks embedded in a cube. The construction and structural parameters of pore and electrical networks are illustrated in detailed. The total impedance response (modulus and phase) of networks is primarily associated with structural parame...
Article
This paper presents a preliminary work to evaluate the influence of slag and superplasticizer on the early-age hydration of cement pastes by an innovative non-contact impedance measurement, heat evolution method, compressive strength and setting time tests. Besides, the cumulative pore volume obtained from modulus and phase of impedance in differen...
Article
h i g h l i g h t s Porosity, volume and surface fractal dimensions of CSA pastes are obtained. Influences of w/c ratios, hydration age and superplasticizer are evaluated. A fractal model is developed to analyze fractal dimensions and porosity. a b s t r a c t This paper presents a preliminary work to evaluate influences of water to cement ratio, h...
Article
In this work, the influence of water to cement ratio, air-entraining agent and alternative attack cycles of freeze-thaw and carbonation on compressive strength, carbonation depth, weight loss and relative dynamic modulus of elasticity of concrete samples is evaluated. What is more, the preliminary comparisons of weight loss and relative dynamic mod...
Article
This paper reviews the evaluation of pore structure in cementitious materials by means of electrical impedance methods from the view point of direct and alternative current tests with or without electrodes. Some main equivalent circuit models in the literatures, which are employed to evaluate the pore structure from experimental results of alternat...
Article
This study focuses on the early-age hydration development in fly ash blended cement pastes. The characteristic features in different hydration stages and the evolution of zeolites phase, viz., gismondine, are identified in high-dosage fly ash blended cement-based materials using the innovative non-contact impedance measurement (NCIM), X-ray diffrac...
Article
This paper proposes a preliminary work to study the diffusion and migration of chloride ions in cement pastes at early age. The non-steady state ion migration coefficients of cement pastes are evaluated from three aspects: 1) electrical rapid ion migration test; 2) non-contact impedance measurement (NCIM) based on a fractal model; and 3) a correspo...

Citations

... e strengths of the mortars formed in cement concrete are easily affected by the hydration degree, especially for tensile strength [11]. ose mechanical properties are the most used model parameters to estimate the cracking risk in the early-age cement concrete [12][13][14][15][16][17][18][19][20], especially for the cracking risk of LHP cement concrete containing FA [5,[21][22][23][24]. With the increment of the FA content, the compressive strength decreases relatively little, while the loss of tensile strength does not affect the cracking risk of the early-age cement concrete structure [7,21]. ...
... Costs incurred from traffic delay and vehicle operations during the maintenance period are user costs. And, society costs are concomitant to the environmental impacts and accidents [22]. Koch et at in 2002 [23] reported that approximately 15% of 583,000 bridges in the United States in 1998 were structurally deficient, primarily due to corrosion of steel and steel reinforcement. ...
... e strengths of the mortars formed in cement concrete are easily affected by the hydration degree, especially for tensile strength [11]. ose mechanical properties are the most used model parameters to estimate the cracking risk in the early-age cement concrete [12][13][14][15][16][17][18][19][20], especially for the cracking risk of LHP cement concrete containing FA [5,[21][22][23][24]. With the increment of the FA content, the compressive strength decreases relatively little, while the loss of tensile strength does not affect the cracking risk of the early-age cement concrete structure [7,21]. ...
... A similar optimum replacement level was also found for compressive and flexural strengths. Several studies have revealed that the abrasion resistance of concrete is closely related to the compressive strength [69][70][71]. The positive and negative effects of using NZ discussed in Cantabro-loss section are also applicable for justifying the abrasion resistance results. ...
... On the other hand, in the recent years, the use of laser scanners has emerged as a powerful tool enabling a description of the reinforcement corrosion distribution with unprecedented resolution, see e.g. [18,[20][21][22]. ...
... However, for crack widths less than 0.15 mm, no increase in the steel corrosion rate was observed. In Chen et al. [16]'s study, no correlation was observed between the steel bar's corrosion rate and the flexural crack width of 0.1 and 0.4 mm. Steel bar corrosion has a negative effect on the shear performance of RC beams, so the beams may suffer a brittle oblique fracture when exposed to a severe corrosion condition [17]. ...
... In these techniques, the selection of the composition of the coated materials is one of the main factors which determine the success of the coating process. Recently, tin (Sn) is becoming the key element in the compositional design of most metallic coating materials which improve the corrosion and oxidation resistance, conductivity, and wear property of metallic substrates [8][9][10]. The hot-dipped tinning and electrotinning processes are now recommended for many engineering applications due to their cost-effectiveness and ease of controlling and optimizing. ...
... These results are consistent with the result of Bello et al. (2018). Malaysia has a lot of natural hydro resource potential and approximately 189 rivers with a length of around 57,300 km (Hossain et al., 2018;Tang et al., 2019) and hydroG contributed around 14% of total Malaysian power generation and installed hydropower capacity of 6,275 (MW) which is the seventh biggest hydropower capacity all over the world according to the Hydropower Status Report (HSR, 2021). Furthermore, it is noticeable that the CO 2 emission reduction effect of hydropower is increased from 0.00763% to 0.0264% with a rising in emissions level from 0.70 to 0.95 quantiles. ...
... Despite the unevenly distributed magnesite geological deposit over the world and thereby higher energy consumption due to the transport distances, MOC composites could still have great ecological potential. This potential is also supported by the possibility to use the waste MgCl 2 produced by fertilizer industry instead of natural MgCl 2 -in that way, some ecological concerns could be minimized [17]. However, the full replacement of concrete by MOC composites is not yet possible, as their performance has its flaws, with probably the biggest one being the insufficient water resistance, which causes their deterioration and therefore greatly affects their durability. ...
... The chloride attack is one of the main factors affecting the durability of reinforced concrete [176][177][178]. For instance, chloride ions widely exist in seawater, deicers or directly in binders and may cause serious corrosion of steel bars [179], leading to cracking [180], spalling and a decrease in the bearing capacity of steel bars [181]. ...