Deju Zhu

Deju Zhu
Hunan University · College of Civil Engineering

34.05
 · 
PhD

About

102
Publications
35,093
Reads
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1,564
Citations
Research Experience
January 2019 - March 2019
McGill University
Position
  • Visiting Professor
January 2015 - December 2015
University of Alaska Anchorage
Position
  • Research Assistant
July 2012 - present
Hunan University
Position
  • Faculty

Publications

Publications (102)
Article
FRP reinforced seawater sea sand concrete (FRP-SWSSC) combines the advantages of corrosion-free FRP bars in the marine environment and the direct utilization of seawater and sea sand, which can lead to a more sustainable and economic-efficient construction material. This paper reports a comprehensive overview of the current works on workability, me...
Article
This study reports the development of ultra-high performance geopolymer concrete (UHPGC) and overcoming the brittleness feature of geopolymer matrix by using different steel fibers. Four straight steel fibers with different aspect ratios and two different deformed steel fibers were investigated. Flowability, compressive strength and flexural behavi...
Article
This paper presents a review of the deterioration of concrete under seawater attack with particular interests in field exposure. The research reported in the literature has shown that salinity of seawater in different areas varies considerably but the type of ions and their proportion are similar. Because of this variation, laboratory studies shoul...
Article
In this study, the effects of different factors on chloride concentration index (Nc) of cement paste were studied. The factors including chloride concentration in soaking solution, slag replacement, external applied voltage and cation ions of soaking solution were all studied from the electrical double layer (EDL) properties point of view. Zeta pot...
Presentation
A review on the durability of FRP bars reinforced seawater and sea sand concrete. This presentation reports a comprehensive overview of the current works on the workability of SWSSC, mechanical properties of FRP bare bars and FRP bars embedded-SWSSC (tensile, interlaminar shear, transverse shear, and flexural strength), bond behavior, durability, a...
Article
The flexural behavior of basalt textile-reinforced concrete (BTRC) with and without pretension and with one of two types of short fibers was investigated using an instrumental four-point bending test under quasi-static loading. BTRC samples consisted of five layers of basalt textile, with and without pretension, and the cement matrix contained shor...
Article
In this paper, the effect of the strain rate (1/600, 40, 80, 120 and 160 s�1) on the dynamic tensile mechanical properties of the polyethylene terephthalate (PET) fiber bundle at room temperate (25 centigrade) was studied using an MTS machine and an Instron drop-weight impact system. The experimental results showed that the tensile strength, failur...
Article
This paper experimentally investigated the effect of temperature on the transverse impact response of preloaded carbon fiber reinforced polymer (CFRP) wire. The CFRP wires with a glass transition temperature of 99 °C were tested in the temperature range of −40 to 80 °C using a drop-weight impact test system. The results show that the maximum impact...
Article
Basalt fiber reinforced polymer (BFRP) tendons are well known for their day-by-day increasing applications in infrastructural engineering. Advantages like high corrosion resistance, low-cost and environment-friendly features make BFRP tendons one of the best alternatives for metal-based (for example steel) reinforcement. Civil engineering component...
Article
h i g h l i g h t s The pullout properties are related to the number yarns of AR-glass textile used. The pullout load and toughness are considerably unpredictable at lower temperature. The shape parameter values are dependent on pullout velocities and temperatures. Fractured behavior of de-bonding can be detected through the SEM method. The variati...
Article
Strengthening of cement-based materials have been always challenging for research communities. The steel bars or cages are the classical reinforcing materials however the limited availability of metals in mother nature lead humans to find suitable alternatives for Cementous concretes. Textile reinforced mortars (TRMs) are the materials in which the...
Article
Biological materials-fish scales exhibit ultra-flexibility due to its functionally graded materials. Inspired by the hierarchical gradient structure of fish scales, a new flexible gradient model that can adequately describe the characteristics of the bioinspired hierarchical structures is proposed in this work. To assess the flexibility of the prop...
Article
The mechanical properties and structures of fish scales have generated considerable research interest, however, comparative studies for different fish scales from different water regions have not been reported. In this paper, the surface morphologies, hierarchical structures and mechanical properties of four kinds of fish scales collected from fres...
Article
Full-text available
This paper investigates the effects of the reinforcement ratio, volume fraction of steel fibers, and prestressing on the uniaxial tensile behavior of carbon textile reinforced mortar (CTRM) through uniaxial tensile tests. The results show that the tensile strength of CTRM specimens increases with the reinforcement ratio, however the textile–matrix...
Article
Tensile behaviors of basalt textile-reinforced concrete (BTRC) with five layers of textile and different volume contents of short carbon, glass, and steel fibers (0.5 vol%, 1.0 vol%, and 1.5 vol% for carbon and steel fibers and 0.5 vol% for glass fiber) are investigated under uniaxial tensile loading by using an MTS load frame. Pre-tensioned BTRC w...
Article
Textile-reinforced concrete (TRC) as a novel high performance composite material can be used as not only strengthening material but component bearing load alone. This paper aims to investigate the influences of the number of textile layers, prestress levels of textile, and volume contents of chopped steel fibers on the flexural behavior of basalt t...
Article
Flexural behavior of textile-reinforced concrete (TRC) samples were investigated by using three-point bending test systems under quasi-static and low-velocity (1.0-4.5 m=s) impact loadings. Two types of TRC samples, namely basalt textile-reinforced concrete (BTRC) and alkali-resistant glass textile-reinforced concrete (GTRC) were tested. The mechan...
Article
Abstract : In order to investigate the strain rate and temperature effect on the flexural mechanical properties of Alkali-Resistant Glass Fabric Reinforced Cementitious Matrix (FRCM) Composite, the FRCM composite specimens were tested under quasi-static (3.33×10-5 s-1) loading in 3-point bending set-up using a MTS load frame at room temperature (25...
Article
Full-text available
Four-point bending tests were adopted to investigate the influences of the number of textile layers, volume content of steel fibres, and prestress on the flexural behaviour of carbon textile-reinforced concrete (TRC). The failure mode of the specimen changed from debonding failure to shear failure, accompanied by the matrix-textile interfacial debo...
Article
High-performance concrete (HPC) has a complex mechanical performance due to its multiscale and multiphase composite structure. In this review, the various methods of multiscale modeling from different disciplines are summarized and discussed. The conjoint use of multiscale modeling and other methods such as image reconstruction technology for HPC i...
Article
Aramid fiber (Kevlar 29) reinforced polymers (AFRP) samples were tested by utilizing a MTS servo-hydraulic high rate testing machine in order to investigate their mechanical properties at different strain rates (25, 50, 100, and 200 s⁻¹) and temperatures (-25, 0, 25, 50, and 100℃). The results show that at the same temperature (25℃), Young's modulu...
Article
The scaled skin of fish is an intricate system that provides mechanical protection against hard and sharp puncture, while maintaining the high flexural compliance required for unhindered locomotion. This unusual combination of local hardness and global compliance makes fish skin an interesting model for bioinspired protective systems. In this work...
Article
This work is conducted to investigate the hierarchical structure, mechanical behavior and fracture resistance of grass carp scales with different water contents (hydrated and dehydrated) and load conditions (uniaxial, biaxial and punch tests). The whole cross-section of scales is investigated, and it is found that the bony layer displays discontinu...
Article
In order to investigate the size effect and the sensibility of strain rate of the jute yarns, the quasi-static tests were conducted by utilizing a C43 electromechanical universal test system and dynamic tests were performed by utilizing a CEAST 9340 drop-weight impact system. The correlations between mechanical parameters (Young's modulus, tensile...
Article
Full-text available
Glass fiber bundles with different gage lengths (25, 50, 100, 150, 200 and 300 mm) were tested under quasi-static loading at a strain rate of 1/600 s⁻¹ using a MTS load frame, and samples with a gage length of 25 mm were tested under dynamic tensile loading at four different strain rates (40, 80, 120 and 160 s⁻¹) and four distinct temperatures (25,...
Article
Full-text available
This study focuses on 24 experimental cases to investigate the influences of textile layers, prestress levels and short steel fibers on the tensile behavior of basalt textile reinforced concrete (TRC). The tensile behavior of basalt TRC is considerably influenced by the number of textile layers. The TRC specimens with one or two textile layers demo...
Article
An electrical floor heating system was designed by using carbon fiber tapes (CFT). The heating performance and economic applicability of the heating system were also analyzed. The heating system was constructed in a bedroom with good heat insulation, and the temperature sensors were arranged at the layers of the floor and near the floor for 24 h du...
Article
Kevlar® 49 fabrics have excellent performances such as high elastic modulus and high impact resistance, which are widely used in ballistic systems, aerospace, fabric reinforced composite materials and other fields. The present work studied the multi-scale mechanical behaviors of Kevlar® 49 in the forms of fiber, yarn and fabric subjected to uniaxia...
Article
Full-text available
The material mechanical properties of Kevlar® 29 yarns and filaments with different gage lengths (yarns: 25 mm, 50 mm, 100 mm, 150 mm, 200 mm and 300 mm; filaments: 12.5 mm, 25 mm and 40 mm) were investigated by quasi-static testing utilizing a MTS load frame and a MTI miniature tester. The results manifested that the material mechanical properties...
Article
CFRP was made by vacuum assisted resin infusion (VARI) and CFRP/Steel single-lap shear joints were manufactured by bonding steel plate and CFRP together with epoxy resin. Specimens were tested under four temperatures (-25, 0, 50, 100℃) with the same loading rate (0.625 m/s) by means of a servo-hydraulic high rate testing system. The experimental re...
Article
Full-text available
Basalt fiber bundle specimens were tested at different strain rates and temperatures utilizing a drop-tower impact system. Results show that mechanical properties of basalt fiber bundle are sensitive to strain rate and temperature. When the temperature is constant, elastic modulus and tensile strength increase with increasing strain rate, but maxim...
Article
Single basalt fiber yarn reinforced composite(single yarn BFRP) samples were tested under quasi-static loading at a strain rate of(1/600)s-1 and room temperature(25℃) using a MTS load frame and dynamic tensile loading at four different strain rates(40, 80, 120, 160s-1) and six different temperatures(-25, 0, 25, 50, 75, 100℃) utilizing a drop-tower...
Article
Full-text available
Unidirectional glass fiber reinforced polymer (GFRP) is tested at four initial strain rates (25, 50, 100 and 200 s-1) and six temperatures ( 25, 0, 25, 50, 75 and 100°C) on a servo-hydraulic high-rate testing system to investigate any possible effects on their mechanical properties and failure patterns. Meanwhile, for the sake of illuminating strai...
Article
Full-text available
Basalt fiber bundle (yarn) and basalt fiber–reinforced polymer (BFRP) samples are tested under four different strain rates (40, 80, 7 120, and 160 s −1) and four distinct temperatures (25, 50, 75, and 100°C) using a drop-weight impact system in this study. Experimental 8 results show that the mechanical properties of the samples tested in this stud...
Article
During the long-term natural evolution, the scales of teleost fish become ultra-thin and ultralight, and have excellent flexibility. In order to develop an innovative flexible protection system, the hierarchical structure and mechanical properties of scales from grass carp were investigated. Two types of samples for scales and collagen layers were...
Article
The mechanical properties of Kevlar® 29 single filaments and yarns with different gage lengths were investigated by utilizing an MTI miniature tester and an MTS load frame. Single yarns of 25 mm were also tested over four different strain rates using a drop-weight impact system. The experimental results showed that the mechanical properties of Kevl...
Article
In order to investigate the size effects and strain rate sensitivity of Kevlar 49 single yarn, quasi-static (strain rate is 1/600 s⁻¹) tensile tests were conducted on Kevlar 49 single yarns with different gauge lengths (25, 50, 100, 150, 200 and 300 mm) using MTS universal testing machine firstly. Then, dynamic (strain rate is 40-60 s⁻¹) tensile te...
Article
High-strength fabrics are ideal materials for use in structural and aerospace systems where high performance and lightweight structures are demanded. Mechanical characterization of this class of materials under dynamic loading is of great importance considering extreme conditions such as explosion, impact, and ballistic loading. The strain-rate eff...
Article
This paper focuses on the tensile behaviours of Kevlar 29 and 49 fabrics reinforced polymers (AFRP-K29 and -K49) at four strain rates (25, 50, 100 and 200 s⁻¹) and five temperatures (−25, 0, 25, 50 and 100 °C). The experimental results show that the tensile mechanical properties of two types of aramid fibre-reinforced polymer (AFRP) are strain-rate...
Article
In order to investigate the tensile mechanical properties of Kevlar 49 single filament (microcosmic) and single yarn (mesoscopic), MTI miniature tensile tester and MTS microcomputer control electron universal testing machine were used respectively to conduct the unidirectional tensile tests on filament and yarn firstly, and found that there was a s...
Article
Full-text available
Kevlar 49 single yarns with different gage lengths (25, 50, 100, 150, 200 and 300 mm) were tested under quasi-static loading at a strain rate of 1/600 s-1 using a MTS load frame and then 25 mm samples were also tested under dynamic tensile loading over a strain rate range of 40 to 160 s-1 utilizing a drop-weight impact system. The experimental resu...
Conference Paper
High-strength woven fabrics and polymers are ideal materials for applications in structural and aerospace systems where large deformations and high energy absorption are required. Mechanical characterization of the dynamic properties of this class of materials is of great importance considering the extreme conditions such as explosion, impact and b...
Article
We present new numerical results in buckling failure analysis of cracked composite functionally graded plates subjected to uniaxial and biaxial compression loads. An accurate extended 3-node triangular plate element in the context of the extended finite element method (XFEM) is developed, integrating the discrete shear gap method (DSG) to eliminate...
Article
This paper presents the experimental results and analytical modeling of the axial compressive behavior of concrete cylinders confined by both glass fiber-reinforced polymer (GFRP) tube and inner steel spiral reinforcement (SR). The concrete structure is termed as GFRP–SR confined concrete. The number of GFRP layers (1, 2, and 3 layers) and volumet...
Article
This study presents the results of an experimental investigation of 18 short concrete columns confined by carbon fiber-reinforced polymer (CFRP) and transverse spiral reinforcement (TSR) under uniaxial compression. Longitudinal rebars are not installed in the specimens in order to eliminate their confinement effect to concrete which affects the ana...
Article
Buckling failure analysis of cracked functionally graded plates by a stabilized discrete shear gap extended 3-node triangular plate element, Buckling failure analysis of cracked functionally graded plates by a stabilized discrete shear gap extended 3-node triangular plate element, Composites Part B (2015),
Conference Paper
Full-text available
The models of concrete confined by both FRP and steel always took the effect of longitudinal rebar into consideration, and related experimental specimens were also fabricated with longitudinal rebar to verify the models. However, the longitudinal rebar will undertake some axial forces which seriously disturb the analysis of confinement provided by...
Conference Paper
Full-text available
This paper presents the experimental results of the axial compressive behavior of concrete cylinders confined by both glass fiber reinforced polymer (GFRP) tube and inner spiral reinforcement (SR). The concrete structure is termed as GFRP-SR-confined concrete. The experimental variables include number of GFRP layers (1, 2 and 3 layers) and the volu...
Chapter
Nacre from mollusc shells is well known for its high toughness and strength. A key-mechanism for its mechanical performance is the progressive locking generated by the waviness of the mineral tablets it is made of. This allows nacre to generate strain-hardening, arrest cracks and spread inelastic deformations over large volumes before failure. Here...
Chapter
Full-text available
Engineered Biomimicry covers a broad range of research topics in the emerging discipline of biomimicry. Biologically inspired science and technology, using the principles of math and physics, has led to the development of products as ubiquitous as VelcroT (modeled after the spiny hooks on plant seeds and fruits). Readers will learn to take ideas an...
Article
Fabric-reinforced cement-based composites are a new class of sustainable construction materials with superior tensile strength and ductility. They demonstrate a significant improvement in the energy absorption capacity as compared to plain concrete materi-als and fiber-reinforced composites. Due to the inherent brittleness and low tensile strength...
Article
High strength woven fabrics are ideal materials for use in structural and aerospace systems where large deformations and high-energy absorption are required. Their high strength to weight ratio and ability to resist high-speed impacts enables them to be more efficient than metals in many applications, including ballistic armors, propulsion engine c...
Article
This paper presents an optimization method and results on a material model of Kevlar 49 fabric that was implemented in LS-DYNA through a user defined material subroutine (UMAT). Both the shear properties of the fabric and the parameters used in Cowper-Symonds (CS) model that accounts for strain rate effect on material properties were optimized to a...
Article
In the present paper, Kevlar® 49 single yarns with different gage lengths were tested under both quasi-static loading at a strain rate of 4.2 × 10−4 s−1 using a MTS load frame and dynamic tensile loading over a strain rate range of 20–100 s−1 using a servo-hydraulic high-rate testing system. The experimental results showed that the material mechani...
Article
The toughness of fiber-reinforced composites largely relies on crack bridging. More specifically, intact fibers left behind the tip of a propagating crack are progressively pulled out of the matrix, dissipating energy which translates into toughness. While short fibers are traditionally straight, recent work has showed that they can be shaped to in...
Article
Nature increasingly serves as a model and inspiration to scientists and engineers, and biomimetics has the potential to lead to novel engineering materials and systems with new combinations of properties, multi-functionalities, adaptabil-ity, and environmental sustainability. In this work, we have studied the structure and mechanics of modern teleo...
Article
This paper presents the development of a test procedure and application of non-contacting strain mea-surement for cement-based composites under moderately high strain rate tensile tests. The strain time histories of test specimens measured by a laser extensometer in high speed mode were derived by a phase-shift technique based on zero-crossing meth...
Article
The objective of this research was to study the behavior of 3D AR glass fabric cement-based composites under impact loading. It was found that 3D fabrics significantly improve the toughness and energy absorption of cement-based composites under impact loading, compared to short AR glass fibers reinforcement. The 3D fabric improves the toughness in...
Article
In this work, we have studied the structure and mechanics of fish scales from striped bass (Morone saxatilis). This scale is about 200-300 μm thick and consists of a hard outer bony layer supported by a softer cross-ply of collagen fibrils. Puncture tests with a sharp needle indicated that a single fish scale provides a high resistance to penetrati...
Article
Dynamic tensile tests are conducted on aluminum alloy (AA) 6061-T6 using a high-speed servohydraulic machine at intermediate strain rates to validate the testing technique and to investigate the strain-rate effect on the material's stress-strain behavior and failure mode. We present the experimental procedures and results discussing the constitutiv...
Article
The experimental behavior of sisal fiber reinforced cement composites subjected to high speed tension load was studied. High strain rates were achieved by using a high rate servo-hydraulic testing machine. A state-of-the-art high speed Phantom camera was also used to take images from the specimen during the test. The images were used in a digital i...
Chapter
Full-text available
Woven fabrics are used in many applications, including ballistic armors, propulsion engine containment systems and fabric reinforced composites. In order to facilitate the design and improvement of such applications, this paper presents the experimental programs of quasi-static uniaxial tension, biaxial tension and picture frame test to obtain the...
Chapter
Full-text available
This paper presents an improved material model suitable for Kevlar 49 fabric which was implemented into the commercial explicit Finite Element (FE) software LS-DYNA through a user defined material subroutine (UMAT). The fabric constitutive behavior in the current material model was obtained from new experimental data in the principal material direc...