About
401
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Introduction
Additional affiliations
July 1994 - present
Position
- Professor (Associate)
Description
- Teaching, research, supervision of students
July 1994 - present
Education
October 1985 - May 1989
Publications
Publications (401)
In this paper, the optimal mix combination of alkali‐activated reactive powder concrete (AARPC) incorporating reactive MgO (R‐MgO) under ambient curing conditions has been developed. The influence of R‐MgO, alkaline activator to binder (Al/Bi) ratio, binder to aggregate (Bi/Agg) ratio, and silicate modulus (SiO 2 /Na 2 O) on the properties of AARPC...
This study reported the axial (concentric and eccentric) and bending (four‐point bending) loadings behavior of glass fiber‐reinforced polymer (GFRP) bar‐reinforced hollow‐core polypropylene fiber concrete (HC‐GFRP‐PFC) columns. The confinement effect of HC‐GFRP‐PFC columns with different center‐to‐center (c/c) spacing of GFRP spirals was also inves...
This study presents new neural-network (NN)-based models to predict the axial load-carrying capacities of fiber-reinforced polymer (FRP) bar reinforced-concrete (RC) circular columns. A database of FRP-reinforced concrete (RC) circular columns having outside diameter and height ranged between 160–305 and 640–2500 mm, respectively was established fr...
This paper proposed a new approach for the strength interaction diagram ( N‐M diagram) of FRP strengthened square steel reinforced high strength concrete (SSRHSC) column, considering the influence of the applied load eccentricity on the ultimate conditions of FRP strengthened high‐strength concrete (HSC). The analytical model for the strength inter...
This study aims to evaluate the effect of the cross-section modification on the performance of square reinforced concrete (SRC) columns discontinuously strengthened with CFRP bands. In line with this research aim, the performance of SRC columns under eccentric and concentric compression was compared with that of circularized square RC (CSRC) column...
Steel-Equal Angle (SEA) has recently been utilized as longitudinal reinforcement in high-strength concrete columns to improve their strength and ductility. However, investigations have been very limited on the responses of eccentrically loaded SEA Reinforced Concrete (SEARC) columns. This paper presents the development of a computer simulation mode...
Conventional steel bars in Reinforced Concrete (RC) square columns are utilized as longitudinal reinforcement and steel ties are utilized as transverse reinforcement for concrete confinement. The concrete confinement in RC columns with square section is less than that with circular section. Recently, Steel-Equal Angle (SEA) as longitudinal reinforc...
Steel equal-angle (SEA) can be used to replace the longitudinal reinforcement in concrete columns to improve their strength and ductility. However, as a novel concept of applying SEA as longitudinal reinforcement in concrete columns, experimental and numerical studies are very limited on the behavior of SEA reinforced high-strength concrete (SEARC)...
In this paper, low‐strength polyvinyl alcohol (L‐PVA) fibers, high‐strength polyvinyl alcohol (H‐PVA) fibers, and polyethylene (PE) fibers were used to prepare ambient cured fly ash‐slag‐based engineered geopolymer composites (EGC). The effects of fiber types and fiber volume fractions (1.5%, 1.75%, 2.0%, 2.25%, and 2.5%) on the compressive strengt...
This study numerically investigates the cyclic behavior of glass fiber-reinforced polymer (GFRP) reinforced concrete exterior beam-column (T-BC) connections (GFRP-RC T-BC connections) with varying amounts of transverse reinforcement (TR) in the connection panel. The amount of TR required to provide adequate confinement and shear strength to the GFR...
Glass fibre-reinforced polymer (GFRP) bars, as reinforcement in concrete structures, have several desirable properties over conventional steel bars, such as high tensile strength, low density and resistance to corrosion. However, there are still some concerns about using GFRP bars as longitudinal reinforcement in concrete columns primarily due to t...
This study analytically investigated the axial-flexural (P-M) interactions of quare reinforced concrete (RC) columns discontinuously strengthened swith fibre reinforced polymers (FRP). Six FRP confined concrete stress-strain models and two sectional analysis methods were used to develop the analytical P-M interactions of discontinuously FRP strengt...
The utilization of industrial waste as an aluminosilicate precursor (AP) for alkali-activated material (AAM) production can provide an outlet for the growing waste stream and relief to landfill. However, to achieve the transformation of extremely varied waste into normalized APs with stable performance on an industrial scale, a universal testing me...
This study investigated the feasibility of using two types of waste glass sand as fine aggregate replacement in ambient cured alkali‐activated mortars (AAMs). Fly ash (FA) and ground granulated blast furnace slag were used as aluminosilicate source materials to produce the AAMs. The waste glass sand was used to replace 0%, 25%, 50%, 75%, and 100% f...
Square spiral-confined reinforced concrete-filled steel tubular (SCRCFST) columns have recently been proposed as a new form of composite columns. The additional confinement exerted by the spiral reinforcements improves the strength and ductility of a square SCRCFST column compared to a square concrete-filled steel tubular (CFST) column. However, th...
In this paper, an experimental program was undertaken to investigate the splitting-tensile strength and the direct-tensile strength of geopolymer concrete reinforced with glass fibers (GCGF). The compressive strength, splitting-tensile strength and direct-tensile strength of plain geopolymer concrete (GC) and GCGF at 28 days were determined. Test r...
This study presents an experimental investigation to evaluate the behavior of circular geopolymer concrete columns reinforced with Glass Fiber Reinforced Polymer (GFRP) bars and helices under axial compression. Four circular geopolymer concrete columns of 160 mm diameter and 640 mm height were tested under concentric and eccentric axial loading. Tw...
This paper investigates the effects of the natural fiber reinforced polymer (FRP) confinement of concrete cylinders on axial compressive strength. Jute and hemp were used as natural cellulosic FRP confinement. Results were compared with the mineral fiber-based basalt fiber reinforced polymer (BFRP) confinement on concrete cylinders. Sixteen concret...
The addition of steel fibers improves the tensile and flexural strengths of plain concrete. However, steel fibers are prone to corrosion, affecting the performance of steel fiber reinforced concrete. This study investigates the mechanical properties of concrete reinforced with 1.5% alkali-resistant glass fibers (AR-GF) and 0.15% polypropylene fiber...
This paper presents an investigation on the efficiency of steel tubes in reinforcing self-compacting concrete (SCC) columns. A theoretical model is developed to study the axial behavior of SCC columns reinforced with steel tubes, considering the effects of confinement on the filled concrete by steel tubes and concrete core confined by spirals. The...
This study experimentally and analytically investigated the compressive behaviour of partially FRP confined concrete, with emphasis on its strain localization phenomenon. An experimental programme was conducted first, in which both fully and partially FRP confined concrete specimens were tested under axial compression. The global deformation as wel...
This paper presents the numerical modeling and behavior of glass fiber-reinforced polymer (GFRP) reinforced concrete (RC) exterior beam-column joints (T-joints) under cyclic loading. The numerical modeling was implemented on four tested RC T-joints (two steel-RC and two GFRP-RC) in the finite element software ATENA. The numerical model was verified...
The behaviour of non-uniformly, discretely and continuously CFRP confined square reinforced concrete (RC) columns under concentric and 25 mm eccentric axial loads was investigated in this study. Eight square RC columns with a height of 800 mm and a side length of 150 mm were cast and tested. Two columns were reference RC specimens, two columns were...
This paper investigates the influence of graphene nanoplatelet (GNP) on the mechanical properties of polyvinyl alcohol (PVA) fibre reinforced engineered geopolymer composite (EGC). The proportion of GNP incorporated into the EGC were 0.1%, 0.5% and 1.0% by the weight of geopolymer binder. Mini-slump flow spread, density, compression, uniaxial tensi...
This study investigated the effects of different configurations of connection reinforcement and anchorages on the cyclic behavior of glass fiber–reinforced polymer (GFRP) reinforced-concrete (RC) exterior beam–column connections (T-connections). Three full-scale GFRP-RC T-connections were tested under reversed cyclic loading. One connection was det...
Reinforced concrete (RC) beams may require flexural strengthening due to the corrosion of reinforcing bars or changes in the design load. The near surface mounted (NSM) and externally bonded (EB) techniques, using either glass or carbon fibre-reinforced polymer (GFRP or CFRP) composites, are used for strengthening deficient RC beams. However, RC be...
This paper proposes two novel reinforcement details for glass fiber-reinforced polymer (GFRP) reinforced concrete (RC) exterior beam-column connections. Four RC exterior beam-column connections with different connection details (SH-bend, GH-bend, Z-bend, and U-bend) were tested under reversed cyclic loading. The two conventional connection details...
The use of an alkali-activated binder as a replacement for ordinary Portland cement (OPC) for the manufacturing of concrete would help in reducing CO2 emissions in the environment. In this study, different percentages of graphene nano-platelets (by weight of aluminosilicate materials) were added in slag-fly ash-based ambient cured alkali-activated...
Concrete-filled fiber reinforced polymer (FRP) tube (CFFT) members have become increasing popular, while the study on CFFT beams especially hollow CFFT beams is rather limited. This paper presents an experimental study on the flexural behaviour of hollow concrete-filled rectangular glass fiber reinforced polymer (GFRP) tubes beams. A total of six b...
Steel reinforcing bars, helices, and fibers in concrete columns are susceptible to corrosion, particularly in aggressive environments. This study experimentally investigated the use of corrosion-free glass fiber-reinforced polymer (GFRP) bars and GFRP helices in hollow-core circular glass fiber concrete (GFC) columns. The influence of the addition...
This study presents an analytical model for the load-moment (P-M) interaction diagrams of circular geopolymer concrete (GPC) columns reinforced with glass fiber-reinforced polymer (GFRP) bars and GFRP helices. The analytical P-M interaction diagrams of GPC columns were developed using the layer-by-layer numerical integration method. The analytical...
Both the external and internal thin-walled steel sections of a rectangular double-skin concrete-filled steel tubular (RDCFST) short column loaded axially may be susceptible to progressive local buckling, which is rarely included in mathematical modeling programs employing the fiber discretization scheme for such composite members. This paper provid...
This paper investigates the effect of graphene on the properties of slag and fly ash-based ambient cured geopolymer paste and mortar. Graphene was added with five percentage (0.0%, 0.1%, 0.5%, 1.0% and 1.5%) of aluminosilicate materials by weight. The initial and final setting times of geopolymer pastes were reduced. The workability of geopolymer p...
This paper presents the results of an experimental investigation on the behavior of glass fiber reinforced polymer (GFRP) bar-reinforced hollow-core (GFRP-HC) circular concrete specimens under concentric, 25 mm and 50 mm eccentric axial loading and four-point bending. The main parameters investigated include the type of reinforcing bars, pitch of t...
This study discusses the behavior of ambient-cured circular geopolymer concrete specimens tested under different loading conditions. Twelve specimens were cast and tested to investigate the in fluence of the type of the reinforcement, that is, steel and glass
fiber-reinforced polymer (GFRP), the pitch of the transverse reinforcement, and loading cond...
This paper proposes a new type of column. The glass fiber reinforced polymer (GFRP) bar reinforced geopolymer concrete (GPC) filled GFRP tube column is presented as a potential substitute of steel reinforced ordinary Portland cement concrete (OPC) column. Type of concrete (OPC and GPC), type of longitudinal reinforcement bars (steel and GFRP) and t...
Rectangular double-skin concrete-filled steel tubular (RDCFST) slender columns made of non-compact or slender steel sections under axial load and bending may undergo local–global interaction buckling, which is rarely considered in existing fiber-based nonlinear modeling procedures for RDCFST columns. In this paper, a new computational model is pres...
This study experimentally investigated the behavior of glass fiber-reinforced polymer (GFRP) reinforced hollow-core concrete specimens under concentric axial compression. The effect of the type of concrete (non-fibrous concrete, i.e., normal concrete without the addition of fibers; polypropylene fiber concrete; and glass fiber concrete) and pitches...
This study investigated the behaviour of short square concrete filled fibre reinforced polymer tube specimens under concentric, uniaxial eccentric, biaxial eccentric and four-point bending loads. Seven concrete filled glass fibre reinforced polymer (GFRP) tube specimens (GFRP-CFFT) and seven traditional steel bar reinforced concrete (steel-RC) spec...
This study investigated the behaviour of short square concrete filled fibre reinforced polymer tube specimens under concentric, uniaxial eccentric, biaxial eccentric and four-point bending loads. Seven concrete filled glass fibre reinforced polymer (GFRP) tube specimens (GFRP-CFFT) and seven traditional steel bar reinforced concrete (steel-RC) spec...
In this study, the load moment (P-M) interaction behavior of geopolymer concrete (GPC) filled fiber reinforced polymer (FRP) tube circular columns internally reinforced with FRP bars was analytically investigated. An analytical model for the P-M interaction behavior of the column was developed and validated against the experimental investigation re...
This study proposes a new strain model for concrete with discrete fiber-reinforced polymer (FRP) confinement. An energy absorption factor for discretely FRP confined concrete and a strain reduction factor of FRP were proposed. The energy absorption factor and strain reduction factor in conjunction with an available strength model of concrete with F...
The available ASTM recommends grout-filled steel tube anchors (STAs) for the tensile testing of 6.4- to 32-mm-diameter glass fiber-reinforced polymer (GFRP) bars and a 9.5-mm-diameter carbon FRP (CFRP) bar. The available ASTM provides minimum STA dimensions for tensile testing of the FRP bars. However, because of the large variations in the FRP bar...
In this study, the behavior of axially loaded plain and fiber‐reinforced geopolymer concrete columns reinforced with glass fiber‐reinforced polymer (GFRP) bars and helices was investigated. Ten ambient‐cured geopolymer concrete columns of 160 mm diameter and 640 mm height were cast and tested under concentric axial loads. The behavior of the column...
The influence of geogrid on the thermal expansion of reactive powder concrete (RPC) was experimentally investigated. Eighteen RPC prisms of dimensions 75 × 75 × 280 mm were tested at a temperature of 27 ± 4°C and a relative humidity of 50 ± 10% for 103 days. Triaxial geogrid having equilateral triangular openings with a side length of 35 mm was use...
This is the first study on the effectiveness of nonuniform fiber-reinforced polymer (FRP) wrapping to strengthen and prevent the sudden failure of a square reinforced concrete (RC) column. The behavior and performance of square RC columns strengthened with nonuniform carbon FRP (CFRP) wrapping were critically investigated in comparison with the beh...
In this study, cement-free geopolymer concrete (GPC) mixes are prepared using locally produced fly ash with varying NaOH concentrations (8 M−16 M), Na2SiO3/NaOH ratios (1.5–2.5) and alkaline activator to fly ash (AA/FA) ratios (0.4–0.6) to investigate the influence of alkaline activators on the mechanical properties of GPC cured at ambient temperat...
The failure envelopes of square and circularized reinforced concrete (RC) columns discretely confined with CFRP have been analytically investigated in this paper. The analytical failure envelopes of the columns were developed using a strip-by-strip integration approach incorporating stress-strain models of constituent materials. The experimental re...
Cross-sectional analyses of circular and square reinforced concrete (RC) columns strengthened with reactive powder concrete jacketing and fibre-reinforced polymer (FRP) wrapping were undertaken. The stress block method was used to determine theoretical axial load–bending moment (AL–BM) interactions of the columns. These were then compared with expe...
This study aims to experimentally and analytically investigate the effectiveness of non-uniform wrapping on circularised reinforced concrete (RC) columns under axial and flexural loads. Sixteen specimens including four square and twelve circularised RC specimens were prepared and tested. Specimens of the first group were square RC specimens. Specim...
An experimental investigation was carried out on a novel type of concrete-filled tube column, which used geopolymer concrete and basalt-fibre-reinforced-polymer reinforcing bars and confinement tube. Geopolymer concrete was used in place of ordinary Portland cement concrete to counter the sustainability challenges of conventional cement manufacture...
The hollow circular steel tubes support the permanent and construction loads of several upper floors during the construction of a high-rise building structure before the concrete is filled into the steel tubes to form circular concrete-filled double steel tubular (CFDST) columns. The preloads acting on the steel tubes may cause a marked reduction i...
In this paper, an analytical stress–strain model is proposed that emphasizes the influence of steel fibers of different geometry and volume content on the behavior of the confined reactive powder concrete (RPC) columns. The proposed model takes into account the influence of the geometry and volume content of steel fiber on the behavior of the confi...
The current study investigated the effect of geogrid reinforcement on the fatigue behavior of concrete beam specimens in terms of the development of strains at the compressive zone. The concrete beam specimens having the dimensions of 150 mm × 150 mm × 550 mm were either unreinforced, reinforced with one layer of triaxial geogrid or reinforced with...
The concrete confinement provided by the circular steel tubes improves the performance of circular concrete-filled double steel tubular (CFDST) columns, which have increasingly been employed as high-performance structural members in tall buildings. This paper presents computational and design models for the simulation and design of high strength CF...
Circular double-skin concrete-filled stainless-steel tubular (DCFSST) columns have the distinguishing feature of high resistance to corrosion so that they can be constructed by either normal concrete or seawater sea-sand based concrete without corrosion. The numerical study of circular short DCFSST columns is very limited. This paper presents the c...
This paper investigates the effect of geogrid reinforcement on the flexural fatigue behaviour of concrete pavements subjected to cyclic loads. Fifteen-notched concrete beam specimens with the dimensions of 150 × 150 × 550 mm were either unreinforced, reinforced with a single or a double geogrid layer. The geogrid was placed at a depth of 55 mm from...
Concrete-filled aluminum tubular (CFAT) columns have the advantages of a lightweight, high resistance to corrosion, good appearance and ease of maintenance over concrete-filled steel tubular (CFST) columns. However, experimental and computational studies on the performance of CFAT columns have rarely been reported. This paper concerns with the fibe...
The geogrid-confined pervious geopolymer concrete pile (GPGCP) with fibre reinforced polymer (FRP)-polyvinyl chloride (PVC)-confined concrete core (FPCC) is a new form of composite piles proposed in a previous study, which consists of a circular geogrid outer tube, a FPCC, and pervious geopolymer concrete (PGC) filled in between. For FPCC, the norm...
Thin-walled square and circular hollow steel tubes are designed to support the permanent and construction loads of several upper composite floors before filling the concrete into the tubes to form concrete-filled double steel tubular (CFDST) columns. The influences of preloads acting on the steel tubes on the structural responses of slender square...
Rectangular concrete-filled double steel tubular (CFDST) columns have increasingly been utilized in high-rise buildings to support heavy loads. However, the responses of eccentrically loaded rectangular CFDST short columns have rarely been studied. This paper reports experimental and numerical investigations into the behavior of rectangular thin-wa...
Reinforcing concrete members with Fibre-Reinforced Polymer (FRP) bars has been the focus of several recent research studies. Yet, only a small number of these research studies investigated the behaviour of FRP bar reinforced concrete columns. This study presents a comprehensive experimental comparison between the structural behaviour of circular no...
Slender rectangular thin-walled concrete-filled steel tubular (CFST) columns in composite building structures exposed to fire may experience the interaction of local and global buckling. Numerical investigations on the interaction buckling responses of such columns under fire exposure have been rarely reported. This paper describes a fiber-based co...
The repair of fire-damaged thin-walled rectangular concrete-filled steel tubular (CFST) columns in engineering structures after fire exposure requires the assessment of their residual strength and stiffness. Existing numerical models have not accounted for the effects of local buckling on the post-fire behavior of CFST columns with rectangular thin...
Square high strength concrete-filled double steel tubular (CFDST) slender columns composed of an internal circular steel tube are increasingly used in tall composite buildings to carry heavy loads. However, thin-walled slender CFDST columns subjected to eccentric loading may fail by the local-global interaction buckling, which significantly reduces...
