Zhangyu Wu

Zhangyu Wu
Nanjing University of Aeronautics & Astronautics · Department of Civil Aviation Engineering

Master of Engineering
PhD Candidate of NUAA, Nanjing, PRC; Visiting Researcher in UCL, London, UK.

About

35
Publications
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345
Citations
Introduction
coral aggregate concrete; fiber concrete; mesoscale modelling

Publications

Publications (35)
Article
Full-text available
This paper develops a novel three-dimensional (3D) mesoscale modelling approach to study the mechanical responses of coral sands under quasi-static and dynamic compressive loading. A series of algorithms were developed to generate the 3D random particle models with controllable shape and size configurations to simulate the coral sands with random s...
Article
Particles around us are generally in the form of irregular characteristics in shape and size. Establishing rational mesoscale models that are suitable for different types of particles is of great significance to comprehensively evaluate the mechanical properties of particulate systems assembled from irregular particles. The preponderances of previo...
Article
This paper presents an experimental and numerical study on the compressive behaviors of a new carbon fiber-reinforced cement-based composite (CFRCC) that is composed of magnesium oxysulfate cement, carbon fiber and some chemical admixtures. Parametric studies on the effects of carbon fiber content and strain rate on the compressive behaviors of CFR...
Article
The constitutive relationship of basic magnesium sulfate cement-coral aggregate concrete (BMSC-CAC) under uniaxial compression was investigated using cylindrical specimens. The equal strain monotonic loading method was applied to obtain the stress-strain curves. Mechanical parameters such as elastic modulus (Ec) and Poisson's ratio(μ) were calculat...
Article
Steel fiber reinforced concrete (SFRC) has drawn extensive attention in recent years for its superior mechanical response to dynamic and impact loadings. Based on the existing test results, the high-strength steel fibers embedded in a concrete matrix usually play a strong bridging effect to enhance the bonding force between fiber and the matrix, an...
Article
Different proportions of coral aggregate, coral sand and basic magnesium sulfate cement (BMSC) were used to prepare the basic magnesium sulfate cement-coral aggregate concrete (BMSC-CAC), which was applied in the island and marine engineering as a brand new type of concrete. The specimens of BMSC-CAC exposed to elevated temperature (100°C, 300°C, 5...
Article
Based on seawater immersion, drying-wetting cycles, carbonation and drying-wetting cycles for coral aggregate sea-water concrete (CASC) with different strength grades, the effect of carbonation and drying-wetting cycles on chloride diffusion behavior of CASC is studied. The results show that the free surface chloride concentration (Cs), free chlori...
Article
For the island-reef engineering construction background in the South China Sea, the research studied the preparation technology, mechanical properties and chloride ion diffusion behavior of coral aggregate seawater concrete and discussed the steel bars corrosion behavior of coral aggregate seawater concrete (CASC) and reliability analysis of servic...
Article
This paper presents an experimental and numerical study on the dynamic splitting tensile properties of ceramic aggregate concrete (CAC) that is composed of ceramic aggregates and mortar matrix. The maximum ceramic aggregate diameter includes 0.3, 0.6, and 0.9 cm. A series of split-tension tests of CAC specimens were conducted first. Parametric stud...
Article
To study the behavior of coral aggregate concrete (CAC) column under axial and eccentric compression, the compression behavior of CAC column with different types of steel and initial eccentricity (ei) were tested, and the deformation behavior and ultimate bearing capacity (Nu) were studied. The results showed that as the ei increases, the Nu of CAC...
Article
The use of coral aggregate concrete (CAC) as a novel construction material has attracted significant attention for the construction of reef engineering structures. To investigate the static splitting-tensile behaviors of CAC under the influence of two factors, namely specimen geometry and bearing strip size, a three-dimensional (3D) mesoscale model...
Article
Steel fiber reinforced concrete (SFRC) can exhibit superior performances of high strength and toughness due to the enhancing effect of discontinuous steel fibers randomly distributed in concrete matrix. For better understanding the size effect on the fracture properties of SFRC structural elements, we developed a three-dimensional (3D) two-phase me...
Article
Coral aggregate is a type of porous and light-weight construction material with intense prospects for the engineering applications in remote ocean islands. However, its macroscopic properties is directly determined by the mesoscopic characteristics, such as texture, porosity, etc. Thus, the mesoscopic characteristics and macroscopic properties of c...
Article
In the study presented in this paper, the quasi-static compressive behaviors of coral aggregate concrete (CAC) were further investigated using the mesoscale modeling method. Three-dimensional (3-D) random particle mesoscale models for CAC with different concrete strength grades were developed and validated through the comparison of numerical and te...
Article
For better understanding the compressive behavior of coral aggregate concrete (CAC) with different volume fractions and maximum aggregate sizes (MASs) for coarse aggregate, an all-sided mesoscopic investigation was performed using a novel 3D mesoscale model assuming concrete to be a three-phase composite material composed of coarse aggregate, morta...
Article
To investigate the dynamic responses and comprehending the damage mechanism of coral aggregate concrete (CAC) in compression, both the experimental and numerical investigations were implemented in the present work. Firstly, the dynamic mechanical properties of CAC at different strain rates were tested through the Split-Hopkinson pressure bar (SHPB)...
Article
Further understanding of the mechanical responses and the failure mechanism of concrete under different loadings, the mesoscale modelling approach considering the heterogeneity of concrete has drawn extensive attention in investigating its mechanical behaviors. State-of-the-art mesoscale modelling approaches and material models for concrete are pre...
Article
The pre-existing studies of the dynamic tensile properties of coral aggregate concrete (CAC) are mainly performed through the splitting-tensile tests or simulations, which have certain discrepancies with the direct tensile properties. This paper employs a 3D mesoscale modelling approach considering the random characteristics (shape and distribution...
Article
The paper presents a mesoscopic investigation into the effects of specimen size and strain rate upon the strength and failure modes of coral aggregate concrete (CAC) in splitting tension. The 3D mesoscale modelling approach that assumes CAC as a tri-phase composite (i.e., aggregate, mortar and ITZ) was established to simulate its tensile behaviours...
Article
In this study, the uniaxial compressive behaviors of ecological concrete were investigated using experimental and numerical methods. The uniaxial compressive test was performed on the cubic specimens with a side length of 150 mm. The three-dimensional (3D) mesoscopic model with the consideration of random shapes and sizes of aggregates was develope...
Article
Steel corrosion in coral aggregate concrete (CAC) mixed with different inhibitors was investigated using electrochemical impedance spectroscopy (EIS) technique in this paper. Considering the porosity characteristic of coral aggregate, a novel method of premixing inhibitor into coral aggregate was proposed and compared with the conventional mixing m...
Article
In order to improve the durability of coral aggregate seawater concrete (CASC) structures, the influences of exposure time, concrete strength, concrete cover thickness, steel type and inhibitor addition method on the steel corrosion behavior of CASC were investigated and the law of steel corrosion in CASC was obtained. This showed that the steel an...
Article
The dynamic compressive behavior of concrete is closely associated with the specimen size effect and the coupling effect of strain rate and specimen size on the compressive properties is something there worthy studying for the development and application of coral aggregate concrete (CAC). A novel 3D mesoscale modelling approach taking the random ch...
Article
Based on the reliability theory and modified chloride diffusion theory, the effects of concrete cover thickness and concrete strength on the service life of coral aggregate concrete (CAC) under island reef environment were analyzed, and the durability design parameters of CAC structural were proposed. As the result, the (1-m) power function boundar...
Article
To explore the specimen aspect-ratio effect on the compressive behavior of coral aggregate concrete (CAC), a three-dimensional (3D) random mesoscale modelling approach considering random shapes and distributions of aggregates is developed in the present study. Compared with available test results, the reliability of the proposed numerical approach...
Article
To study the flexural behavior and calculation model, 8 coral aggregate concrete (CAC) beams with different types of steel were designed. The flexural behavior of CAC beam was tested. The failure mode, bearing capacity, the maximum crack width (ws) and average crack spacing (lm) were studied. A calculation model for the bearing capacity of CAC beam...
Article
Reinforced coral aggregate concrete beam and reinforced ordinary aggregate concrete beam with different concrete type, concrete strength, and steel type were designed in this study to investigate their shear behavior. The shear behavior of reinforced coral aggregate concrete beam was tested, the failure mode and deflection behavior were studied, an...
Article
The use of electrochemical impedance spectroscopy (EIS) method, Nyquist plots, and Bode impedance module plots of coral aggregate seawater concrete (CASC) at different exposure times in a seawater immersion environment was tested. The most suitable equivalent electric circuit (EEC) for fitting reinforcement corrosion of CASC in a seawater immersion...
Article
An investigation that combines both experimental tests and mesoscopic modelling is conducted to characterize the dynamic splitting-tensile behavior of coral aggregate concrete (CAC). Static and dynamic splitting-tensile strength and failure patterns of CAC with different uniaxial compressive strength (30–70 MPa) are tested by means of MTS machine a...
Article
Full-text available
Purpose Coral aggregate seawater concrete (CASC) is a new type of lightweight aggregate concrete that is becoming widely used in reef engineering. To investigate the corrosion behavior of different kinds of rebar in CASC exposed to simulated seawater for 0-270 d, the electrochemical techniques, including linear polarization resistance (LPR) techniq...
Article
Chloride threshold is a significant index to judge the initial corrosion of rebar in concrete structures, and a key parameter for durability analysis and service life design of reinforced concrete structures. In the present wok, the corrosion rate of rebar embedded in coral aggregate concrete and the chloride ion diffusion law of coral aggregate co...
Article
Through the flexural behavior test of coral aggregate reinforced concrete beams (CARCB) and ordinary Portland reinforced concrete beams (OPRCB), and based on the parameters of concrete types, concrete strength grades and reinforcement ratios, the crack development, failure mode, midspan deflection and flexural capacity were studied, the relationshi...
Article
Purpose This paper aims to reduce the cost, limit the time and increase raw material source availability, coral aggregate seawater concrete (CASC) composed of coral, coral sand, seawater and cement can be widely used for the construction of ports, levees, airports and roads to achieve practical engineering values. However, the naturally porous cor...
Article
The large eccentric compression behavior of 9 coral aggregate reinforced concrete columns (CARCC) and 2 ordinary Portland reinforced concrete columns (OPRCC) was tested. The concrete type, concrete strength grade and reinforcement type were selected as parameters. The crack development, deformation and bearing capacity were investigated. The relati...

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Projects

Projects (2)
Project
The durability performances of coral aggregate concrete are experimentally investigated , including the choloirde diffusion, steel corrosion, etc.
Project
Using a three-dimensional mesoscale model to investigate the mechanical properties of coral aggregate concrete under static and dynamic loading, including quasi-static compresion, tensile, impact, explosive and penetration loading.