Can supervise: YES
Vu, TH & Gowripalan, N 2018, 'Mechanism of heavy metal immobilisation using geopolymerisation techniques - A review', Journal of Advanced Concrete Technology, vol. Vol 16, no. 3, pp. 124-135.View/Download from: UTS OPUS or Publisher's site
Every year, substantial amount of waste materials containing toxic substances is produced throughout the world, which causes serious damage to the environment and poses threat to human health. Among available techniques of immobilisation of toxic elements in harmful by-products, geopolymerisation is considered as an effective approach to deal with many environmental issues. Geopolymer binders have long been recognised to have great potential in immobilisation of hazardous wastes due to its advantages over Portland cement based binders. A profound knowledge of how hazardous elements are immobilised by geopolymer binders is necessary for achieving effective waste management strategies. This paper provides some important aspects of geopolymer materials regarding the immobilisation mechanisms and factors influencing the immobilisation efficiency, which are necessary to carry out further research on addressing the hazardous waste immobilisation.
Erkmen, RE, Gowripalan, N & Sirivivatnanon, V 2017, 'Elasto-plastic damage modelling of beams and columns with mechanical degradation', Computers and Concrete, vol. 19, no. 3, pp. 315-323.View/Download from: UTS OPUS or Publisher's site
© 2017 Techno-Press, Ltd. Within the context of continuum mechanics, inelastic behaviours of constitutive responses are usually modelled by using phenomenological approaches. Elasto-plastic damage modelling is extensively used for concrete material in the case of progressive strength and stiffness deterioration. In this paper, a review of the main features of elasto-plastic damage modelling is presented for uniaxial stress-strain relationship. It has been reported in literature that the influence of Alkali-Silica Reaction (ASR) can lead to severe degradations in the modulus of elasticity and compression strength of the concrete material. In order to incorporate the effects of ASR related degradation, in this paper the constitutive model of concrete is based on the coupled damage-plasticity approach where degradation in concrete properties can be captured by adjusting the yield and damage criteria as well as the hardening moduli related parameters within the model. These parameters are adjusted according to results of concrete behaviour from the literature. The effect of ASR on the dynamic behaviour of a beam and a column are illustrated under moving load and cyclic load cases.
Wong, ACL, Childs, PA, Terry, W, Gowripalan, N & Peng, GD 2007, 'Experimental investigation of drying shrinkage and creep of concrete using fibre-optic sensors', Advances in Structural Engineering, vol. 10, no. 3, pp. 219-228.View/Download from: Publisher's site
Drying shrinkage and creep are two of the most important time-dependent properties of concrete, and the health monitoring of any large-scale concrete structure is practically the monitoring of the combined effects of these two physical properties. We present a fibre-optic sensing technique using fibre Bragg grating (FBG) sensors for the experimental investigation of drying shrinkage and creep of structural grade (40 MPa) concrete. It offers many advantages over the conventional electrical and mechanical methods for both structural health monitoring and standard tests of the mechanical properties. The FBG sensors are directly embedded into concrete specimens and the data are obtained by an optical measurement system. Standard mechanical method, as specified by the Australian Standards, is also used for comparison. Good agreements between the two methods are achieved for both drying shrinkage and creep. The long-term behaviours are predicted from the experimental data, and the accuracies of prediction are discussed. This optical technique can yield a strain resolution of better than 3 .
Childs, P, Wong, ACL, Gowripalan, N & Peng, GD 2007, 'Measurement of the coefficient of thermal expansion of ultra-high strength cementitious composites using fibre optic sensors', CEMENT AND CONCRETE RESEARCH, vol. 37, no. 5, pp. 789-795.View/Download from: Publisher's site
Wong, ACL, Childs, PA, Berndt, R, Macken, T, Peng, G-D & Gowripalan, N 2007, 'Simultaneous measurement of shrinkage and temperature of reactive powder concrete at early-age using fibre Bragg grating sensors', CEMENT & CONCRETE COMPOSITES, vol. 29, no. 6, pp. 490-497.View/Download from: Publisher's site
Han, CG, Hwang, YS, Yang, SH & Gowripalan, N 2005, 'Performance of spalling resistance of high performance concrete with polypropylene fiber contents and lateral confinement', CEMENT AND CONCRETE RESEARCH, vol. 35, no. 9, pp. 1747-1753.View/Download from: Publisher's site
Hamidah, HM, Gowripalan, N & Fadhil, NM 2001, 'Absorption of aramid prestressing rods in aggressive solutions', JOURNAL OF COMPOSITES FOR CONSTRUCTION, vol. 5, no. 4, pp. 254-257.View/Download from: Publisher's site
Lim, CC, Gowripalan, N & Sirivivatnanon, V 2000, 'Microcracking and chloride permeability of concrete under uniaxial compression', CEMENT & CONCRETE COMPOSITES, vol. 22, no. 5, pp. 353-360.View/Download from: Publisher's site
Gowripalan, N & Mohamed, HM 1998, 'Chloride-ion induced corrosion of galvanized and ordinary steel reinforcement in high-performance concrete', CEMENT AND CONCRETE RESEARCH, vol. 28, no. 8, pp. 1119-1131.View/Download from: Publisher's site
Gowripalan, N, Cabrera, JG, Cusens, AR & Wainwright, PJ 1990, 'Effect of curing on durability', Concrete International, vol. 12, no. 2, pp. 47-54.
The durability of concrete structures is greatly influenced by the curing of the concrete. Inadequate curing can result in a very weak and porous material near the surface of the concrete that is vulnerable to ingress of various harmful substances from the environment. A review is presented of the effects of methods and duration of curing on concrete properties with respect to permeability, porosity, and water absorption. Results obtained from mortar specimens that were cured using chemical membranes are discussed. A brief discussion on the current method of assessing the curing efficiency of chemical membranes is also presented.
Cabrera, JG, Gowripalan, N & Wainwright, PJ 1989, 'An assessment of concrete curing efficiency using gas permeability', Magazine of Concrete Research, vol. 41, no. 149, pp. 193-198.View/Download from: Publisher's site
The current practice of assessing the effectiveness of a concrete curing compound is based on evaporation measurements from cement mortar slabs. The lack of precision of individual moisture loss measurements has prompted further investigation to measure other parameters to assess curing efficiency. This Paper reports preliminary results of a method based on oxygen permeability to assess curing efficiency. A comparison is made with results obtained using the method recommended in a British Standard draft.3The oxygen permeability method can also be applied to traditional methods of curing such as those utilizing wet hessian or burlap. © 1989, Thomas Telford Ltd. All rights reserved.
The results of tensile and bending tests carried out on specimens of raffia bamboo are presented. Raffia bamboo are natural materials commonly used for the construction of buildings and household furniture in South Eastern Nigeria. The test results show that the material is capable of attaining an ultimate tensile strength of about 150 N/mm2 and a modulus of elasticity in tension of about 24 kN/mm2. These strength properties compare favourably with those of most natural timber species and also some oriented polymers used in fibre reinforced concrete. © 1989.
High strength polymer bars produced from thermoplastics were investigated with a view to using these as reinforcement, mainly for semi-structural concrete elements. This paper describes some of the properties of these bars and their possible applications. © 1987.
Gowripalan, N & Cao, J 2018, 'Effect of Alkali Silica Reaction on Bond Strength and Load Capacity of Reinforced Concrete Structures', International fib Congress, Melbourne, Australia.View/Download from: UTS OPUS
Gowripalan, N 2018, 'Autogenous Shrinkage of Concrete at Early Ages', Australasian Conference on Mechanics of Structures and Materials, Brisbane, Australia.
Due to the high cementitious content and low water/binder ratios HPC and UHPC have a high autogenous shrinkage at early ages,. In this paper autogenous shrinkage of HPC and UHPC at very early ages are compared. The different components of shrinkage such as plastic, chemical, autogenous and drying are clearly differentiated.
Vu, TH, Gowripalan, N, De Silva, P, Sirivivatnanon, V & Kidd, P 2018, 'CARBONATION AND CHLORIDE INDUCED STEEL CORROSION RELATED ASPECTS IN FLY ASH/SLAG BASED GEOPOLYMERS - A CRITICAL REVIEW', International fib Congress, Melbourne, Australia.View/Download from: UTS OPUS
Wang, JJ, Gowripalan, N, Li, J & Nguyen, VV 2016, 'Close-range photogrammetry for accurate deformation distribution measurement', Mechanics of Structures and Materials: Advancements and Challenges - Proceedings of the 24th Australasian Conference on the Mechanics of Structures and Materials, ACMSM24 2016, Australian Conference on the Mechanics of Structures and Materials, Taylor and Francis, Perth, Australia, pp. 793-799.View/Download from: UTS OPUS
© 2017 Taylor & Francis Group, London. This paper introduces a methodology for improving the accuracy of Deformation Distribution Measurement (DDM) using close-range photogrammetry. After reviewing various algorithms for 2D Digital Image Correlation (DIC), Zero-Normalized Cross-Correlation (ZNCC) is selected for deformation measurement. The impact of several other factors on DIC measurement accuracy has been investigated, including the type of imaging sensors, the contrast and pattern of a specimen, and searching window size. Optimal option of these factors is proposed. The technique is utilized in the experiment of applying static loading on a replica of a concrete structural component used for Sydney Harbour Bridge. Test results presented in the paper include DIC measurements and validation data from conventional sensors.
Sanchayan, S, Gowripalan, N & Foster, SJ 2013, 'Mechanical properties of fibre reinforced reactive powder concrete after exposure to high temperatures', From Materials to Structures: Advancement Through Innovation - Proceedings of the 22nd Australasian Conference on the Mechanics of Structures and Materials, ACMSM 2012, pp. 1177-1181.View/Download from: UTS OPUS
Reactive Powder Concrete (RPC) is a high-performance concrete that exhibits excellent mechanical properties and durability characteristics, owing to its homogeneity, dense microstructure and the presence of fibres. This research studies its behaviour with exposure to high temperature. The results include residual compressive strength and modulus of elasticity for two RPC mixes, one containing steel fibres and a second with PVA fibres. Temperature exposures up to 700°C were investigated. Testing of RPC cylinders containing steel fibres exposed to temperatures above 400°C show a violent explosive reaction under thermal loading with precautions needed in the laboratory to guard against the explosive effect.The results showan increase in residual compressive strength up to a temperature of 300°C; but beyond 300°C, the strength is reduced considerably. The elastic modulus also showed a steady loss at high temperatures and the research methodology and results are presented within. © 2013 Taylor & Francis Group.
Lim, CC, Gowripalan, N & Sirivivatnanon, V 2006, 'Predicting chloride content profile in concrete using a concrete mix design parameter', Concrete Repair, Rehabilitation and Retrofitting - Proceedings of the International Conference on Concrete Repair, Rehabilitation and Retrofitting, ICCRRR 2005, pp. 125-127.
Many service life prediction models for concrete require information from existing structure, for example, chloride concentration value at a known depth in concrete and the period of chloride exposure before a prediction can be made. Those models are useful when dealing with service life of existing concrete structures. In the case of designing a new concrete structure for service life, the prediction may be hindered because the required field information is not available at the time of design. Hence, a model which can give an estimate of the service life of a structure at the design stage is necessary. In the present study, a chloride concentration prediction model based on a concrete mix design parameter is proposed. The model is developed based on results of chloride immersion tests conducted in a controlled laboratory environment. The model is verified using data obtained from the present study and from the literature. The model can reasonably predict the chloride concentration profile in Ordinary Portland Cement (OPC) concretes having a water to cement ratio between 0.40 and 0.67. © 2006 Taylor & Francis Group, London.
Voo, JYY, Gilbert, I, Foster, S & Gowripalan, N 2004, 'Strength of D-regions in reactive powder concrete girders', Proceedings of the fib Symposium 2004 - Concrete Structures: The Challenge of Creativity, pp. 296-297.
This paper reports the results of tests on six reactive powder concrete deep panels. The panels were designed to simulate failure by bursting in the anchorage regions of prestressed concrete girders. Of particular interest were the development and growth of the splitting crack. The main conclusions are that the location of the bursting crack is dependant on the boundary arrangements; the quantity and type of fibres influences the growth and stability of the crack; and, with two percent by volume of fibres, the tearing load is at least twice the cracking load.
Voo, JYL, Foster, S, Gilbert, RI & Gowripalan, N 2003, 'Behaviour of fibre reinforced RPC deep panels', ADVANCES IN STRUCTURES, VOLS 1 AND 2, International Conference on Advances in Structures, Steel, Concrete, Composite and Aluminium (ASSCCA 03), A A BALKEMA PUBLISHERS, SYDNEY, AUSTRALIA, pp. 1101-1106.
Voo, J, Foster, SJ, Gilbert, RI & Gowripalan, N 2001, 'Design of disturbed regions in reactive powder concrete bridge girders', HIGH PERFORMANCE MATERIALS IN BRIDGES, International Conference on High Performance Materials in Bridges, AMER SOC CIVIL ENGINEERS, Kona, HI, pp. 117-127.
Voo, J, Foster, SJ, Gilbert, RI & Gowripalan, N 2003, 'Design of disturbed regions in reactive powder concrete bridge girders', High Performance Materials in Bridges, pp. 117-127.
In this paper the benefits of using reactive powder concrete (RPC) to carry bursting forces in prestressed bridge girders is investigated. Tests were undertaken on three RPC, 150 MPa, deep beams with the results reported. Also in this paper is a FE analysis of a 35 metre prestressed RPC bridge girder. The paper shows some of the significant potential advantages of using RPC in bridge engineering.
Gowripalan, N 2001, 'Fibre optic and piezoelectric sensors for structures with FRP: State of the art', FRP COMPOSITES IN CIVIL ENGINEERING, VOLS I AND II, PROCEEDINGS, International Conference on FRP Composites in Civil Engineering, ELSEVIER SCIENCE BV, HONG KONG, PEOPLES R CHINA, pp. 1635-1642.
Pillar, N & Gowripalan, N 2000, 'Post-cracking behaviour of fibre reinforced concrete at early ages', ADVANCED COMPOSITE MATERIALS IN BRIDGES AND STRUCTURES, 3rd International Conference on Advanced Composite Materials in Bridges and Structures, CANADIAN SOCIETY CIVIL ENGINEERING, OTTAWA, CANADA, pp. 77-84.
Zou, PXW, Gowripalan, N & Gilbert, RI 2000, 'An experimental study on the time-dependent behaviour of concrete beams prestressed by AFRP tendons', ADVANCED COMPOSITE MATERIALS IN BRIDGES AND STRUCTURES, 3rd International Conference on Advanced Composite Materials in Bridges and Structures, CANADIAN SOCIETY CIVIL ENGINEERING, OTTAWA, CANADA, pp. 169-176.
Gowripalan, N, Zou, XW & Gilbert, RI 2000, 'Design considerations for ductility of prestressed beams with AFRP and CFRP tendons', ADVANCED COMPOSITE MATERIALS IN BRIDGES AND STRUCTURES, 3rd International Conference on Advanced Composite Materials in Bridges and Structures, CANADIAN SOCIETY CIVIL ENGINEERING, OTTAWA, CANADA, pp. 355-362.
Gowripalan, N, Zou, XW & Gilbert, RI 1999, 'Deformability of prestressed beams with AFRP and CFRP tendons', MECHANICS OF STRUCTURES AND MATERIALS, 16th Australasian Conference on the Mechanics of Structure and Materials, A A BALKEMA PUBLISHERS, SYDNEY, AUSTRALIA, pp. 195-200.
Bandyopadhyay, S, Kao, GJP, Gowripalan, N & Postle, R 1999, 'Atomic force microscopy study of carbon fibre reinforced cementitious composites', POLYMER COMPOSITES'99: AN INTERNATIONAL SYMPOSIUM ON POLYMER COMPOSITES SCIENCE AND TECHNOLOGY, SPE International Symposium on Polymer Composites Science and Technology, SOC PLASTICS ENGINEERS, LAC DELAGE, CANADA, pp. 53-+.
Zou, XW, Gowripalan, N & Gilbert, RI 1997, 'Flexural behaviour and ductility of HSC beams prestressed with AFRP tendons', MECHANICS OF STRUCTURES AND MATERIALS, 15th Australasian Conference on the Mechanics of Structures and Materials, A A BALKEMA PUBLISHERS, UNIV MELBOURNE, MELBOURNE, AUSTRALIA, pp. 135-140.
Zou, XW, Gowripalan, N & Gilbert, RI 1997, 'Fibre reinforced plastics - Development and properties', MECHANICS OF STRUCTURES AND MATERIALS, 15th Australasian Conference on the Mechanics of Structures and Materials, A A BALKEMA PUBLISHERS, UNIV MELBOURNE, MELBOURNE, AUSTRALIA, pp. 75-81.
WAINWRIGHT, PJ, CABRERA, JG & GOWRIPALAN, N 1990, 'ASSESSMENT OF THE EFFICIENCY OF CHEMICAL MEMBRANES TO CURE CONCRETE', PROTECTION OF CONCRETE, INTERNATIONAL CONF ON PROTECTION OF CONCRETE, E & FN SPON, UNIV DUNDEE, DUNDEE, SCOTLAND, pp. 907-920.