Author
Abdul Rahim
Bio: Abdul Rahim is an academic researcher from Indian Institute of Technology Roorkee. The author has contributed to research in topics: Residual & Compressive strength. The author has an hindex of 3, co-authored 3 publications receiving 50 citations.
Papers
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TL;DR: In this article, the authors present results of an experimental study undertaken to optimize the residual compressive strength of heated high performance concrete using the Taguchi off-line method and the utility concept.
50 citations
TL;DR: In this paper, the authors present results of an experimental study undertaken to optimize the residual compressive strength of heated concrete with respect to various mix design parameters using the Taguchi method.
Abstract: This paper presents results of an experimental study undertaken to optimize the residual compressive strength of heated concrete with respect to various mix design parameters using the Taguchi method. The design of experiments (DoE) was carried out by standard L9 (34) orthogonal array (OA) of four factors with three material parameter levels. The factors considered were water-cement ratio, cement content, super-plasticizer dosage and fine aggregate content. The specimens were heated up to 200°C, 400°C, 600°C and 800°C target temperatures and were subsequently tested under axial compressive loads in cooled condition. Based on the results, the material parameter responses of optimum performance characteristics were analyzed by statistical analysis of signal to noise ratio (S/N) and analysis of variance (ANOVA) techniques to maximize the post-fire residual compressive strength of concrete. The results indicate that the best level of control factors paid their own contribution of compressive strength at vario...
7 citations
01 Sep 2013
TL;DR: In this paper, the effect of type of mineral admixture, pre-load and the presence of confining reinforcement on the spalling behaviour of heated high performance concrete (HPC) columns was investigated.
Abstract: The present experimental program was planned to investigate the effect of type of mineral admixture, pre-load and the presence of confining reinforcement on the spalling behaviour of heated high performance concrete (HPC). Reinforced concrete cylindrical short columns were cast and exposed to four different target temperatures. A compressive preload equal to 25% of the ultimate load capacity of column was maintained on the specimens during heating and cooling. The test results mainly focus on the influence of above said variables on spalling behaviour of reinforced HPC columns. Interesting observations have been made in the paper on the subject matter of the workshop.
7 citations
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TL;DR: In this paper, the compressive properties of SFRAC cylinders after exposure to elevated temperatures were investigated, including compressive strength, Young's modulus (stiffness), stress-strain curve and energy absorption capacity (toughness).
145 citations
TL;DR: In this article, a methodology is proposed to optimize the operating parameters of a ground source heat pump (GSHP) system which will operate on both heating and cooling modes, and the results have been analyzed for the optimum conditions using Signal-to-Noise (SN) ratio and Analysis Of Variance (ANOVA) method.
131 citations
TL;DR: In this article, the coupling effects of silica fume and steel-fiber on the compressive performance of recycled aggregate concrete (RAC) under elevated temperatures were evaluated.
85 citations
TL;DR: In this paper, nano-silica (NS) is included in the cementitious composite to improve the modulus of elasticity and minimise the drying shrinkage in self-compacting ECC without adversely affecting its ductility.
78 citations
TL;DR: In this paper, the effect of wool on improving fire retardancy of polypropylene (PP) composite has been identified by some preliminary flammability tests, and Wool characteristics within the extruded composites, namely fiber length, orientation and fracture behaviour, were also investigated by image analysis to find out their influence on the improvement of mechanical properties.
Abstract: Polypropylene (PP) and wool composite sheets were fabricated by continuous extrusion. Increases in mechanical properties of the composites, such as tensile modulus and strength, were achieved by adding wool and a suitable compatibiliser. Significant manufacturing parameters and desired formulations of the wool–PP composites to achieve the best possible mechanical properties were determined by Taguchi analysis. Wool characteristics within the extruded composites, namely fibre length, orientation and fracture behaviour, were also investigated by image analysis to find out their influence on the improvement of mechanical properties. Furthermore, positive effect of wool on improving fire retardancy of the composite has been identified by some preliminary flammability tests.
78 citations