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RISS 인기검색어
- 검색키워드
- 저자 : Qasim S. Khan (검색결과 4 건)
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Axial compressive behaviour of circular CFFT: Experimental database and design-oriented model
Qasim S. Khan,M. Neaz Sheikh,Muhammad N.S. Hadi 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.21 No.4
Concrete Filled Fibre Reinforced Polymer Tube (CFFT) for new columns construction has attracted significant research attention in recent years. The CFFT acts as a formwork for new columns and a barrier to corrosion accelerating agents. It significantly increases both the strength capacity (Strength enhancement ratio) and the ductility (Strain enhancement ratio) of reinforced concrete columns. In this study, based on predefined selection criteria, experimental investigation results of 134 circular CFFT columns under axial compression have been compiled and analysed from 599 CFFT specimens available in the literature. It has been observed that actual confinement ratio (expressed as a function of material properties of fibres, diameter of CFFT and compressive strength of concrete) has significant influence on the strength and ductility of circular CFFT columns. Design oriented models have been proposed to compute the strength and strain enhancement ratios of circular CFFT columns. The proposed strength and strain enhancement ratio models have significantly reduced Average Absolute Error (AAE), Mean Square Error (MSE), Relative Standard Error of Estimate (RSEE) and Standard Deviation (SD) as compared to other available strength and strain enhancement ratios of circular CFFT column models. The predictions of the proposed strength and strain enhancement ratio models match well with the experimental strength and strain enhancement ratios investigation results in the compiled database.
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Qasim S. Khan,M. Neaz Sheikh,Muhammad N.S. Hadi 국제구조공학회 2019 Steel and Composite Structures, An International J Vol.30 No.6
This research study investigates experimentally and analytically the axial compressive behaviour of Concrete Filled Fiber Reinforced Polymer Tube (CFFT) columns with and without Fiber Reinforced Polymer (FRP) bars. The experimental program comprises five circular columns of 204-206 mm outer diameter and 800-812 mm height. All columns were tested under concentric axial compressive loads. It was found that CFFT columns with and without FRP bars achieved higher peak axial compressive loads and corresponding axial deformations than conventional steel reinforced concrete (RC) column. The contribution of FRP bars was about 12.1% of the axial compressive loads carried by CFFT columns reinforced with FRP bars. Axial load-axial deformation (P ‒ δ) curves of CFFT columns were analytically constructed, which mapped well with the experimental P ‒ δ curves. Also, an equation was proposed to predict the axial compressive load capacity of CFFT columns with and without FRP bars, which adequately considers the contributions of the circumferential confinement provided by FRP tubes and lower ultimate strength of FRP bars in compression than in tension.
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Asma Rafiq,Muhammad Ikram,S. Ali,Faiza Niaz,Maaz Khan,Qasim Khan,Muhammad Maqbool 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.97 No.-
Textile industry represents a pollution problem worldwide due to the accidental discharge or dumping ofpolluted wastewater into the waterways, which is having a major influence on the quality of waterresources. Around 17–20% of industrial water pollution arises from textile dyeing and treatmentaccording to the World Bank report. This represents a large environmental challenge for textilemanufacturers. With growing environmental awareness, there is a need for environmentally-friendlytechnology to remove dyes from the industrial and local wastewater. The photo decolorization of dyes isconsidered as a favorable technology for industrial wastewater treatment techniques owing to itsenvironmentally friendly method, low cost, and lack of secondary pollution. The efficiency ofphotocatalysis system depends on the operational parameters that govern the adsorption andphotodegradation of dye molecules. This comprehensive review examines the operational factorsinfluencing the photo decolorization of dye molecules. Our study aims to review and summarize thepreviously published works and R&D progress in thefield of photocatalysis of various water pollutantssuch as the toxic organic compounds (cationic and anionic dyes) using various semiconductornanoparticles under visible, solar and UV irradiation. This paper examines the effects of operatingparameters on the photocatalytic degradation of textile dyes using various photocatalysts. Ourfindingsshowed that various parameters, like initial pH of the solution to be degraded, photocatalystconcentration, reaction temperature, dye concentration and dopants content exert their individualinfluence on the photocatalytic degradation of any dye. By investigating previous research to elucidatethe most significant active species for optimal photo decolorization reactions, this review providesguidelines that can be applied to the development of effective photodegradation systems. The results ofour study will help determine the most effective and economical options for removal of dyes in industrialwastewater.
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Reinforced fibrous recycled aggregate concrete element subjected to uniaxial tensile loading
Hameed, R.,Hasnain, K.,Riaz, M. Rizwan,Khan, Qasim S.,Siddiqi, Zahid A. Techno-Press 2020 Advances in concrete construction Vol.9 No.2
In this study, effect of recycled aggregates and polypropylene fibers on the response of conventionally reinforced concrete element subjected to tensile loading in terms of tension stiffening and strain development was experimentally investigated. For this purpose, concrete prisms of 100 × 100 mm cross section and 500 mm length having one central deformed steel re-bar were cast using fibrous and non-fibrous Recycled Aggregate Concrete (RAC) with varying percentages of recycled aggregates (0%, 25%, 50%, 75% and 100%) and tested under uniaxial tensile load. For all fibrous RAC mixes, polypropylene fibers were used at constant dosage of 3.15 kg/㎥. Effect of recycled aggregates and fibers on the compressive strength of concrete was also explored in this study. Through studying tensile load versus global axial deformation of composite and strain development in concrete and steel, it was found that replacement of natural aggregates with recycled aggregates in concrete negatively affected the cracking load, tension stiffening and strain development, and this negative effect was observed to be increased with increasing contents of recycled aggregates in concrete. The results of this study showed that it was possible to minimize the negative effect of recycled aggregates in concrete by the addition of polypropylene fibers. Reinforced concrete element constructed using concrete containing 50% recycled aggregates and polypropylene fibers exhibited cracking behavior, tension stiffening and strain development response almost similar to that of concrete element constructed using natural aggregate concrete without fiber.
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