Papers by Aanal Shah
International Journal of Innovative Research in Physics, 2021
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Kalpa Publications in Civil Engineering
There have been increasing efforts in recent years to minimize the amount of cement used in concr... more There have been increasing efforts in recent years to minimize the amount of cement used in concrete. Efforts at partial replacement have been successful and regulations have been promulgated to standardize and use such formulations. Research aimed at complete replacement of cement by activating industrial materials that are rich in silica and alumina with alkaline solutions is still on-going all over the world. The present study was aimed at complete elimination of cement through the development of a geopolymer concrete containing the mixture of fly ash and ground granulated blast furnace slag (GGBS), activated by sodium based alkaline activators. The effect of replacing up to 50% fly ash by GGBS was considered. The strength parameters were studied for a mixture of sodium silicate and sodium hydroxide solution having concentration 12M. The samples were cured under ambient conditions as well as in an oven at 60oC for 24 hours. Compressive and split tensile strengths of the samples w...
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RILEM, 2018
Since last few years Concrete Technologists are putting in continuous efforts to minimize the con... more Since last few years Concrete Technologists are putting in continuous efforts to minimize the consumption of cement in concrete. Cement offering architectural freedom and being second highest consumed material on earth is also the major cause for CO2 emission in atmosphere. With limited natural resources, durability issues and higher embodied energy, a need is felt to lessen or curtail the use of cement in concrete and replace the same with immensely available industrial by-products such as fly ash and GGBS. These materials, when activated by an alkaline solution exhibit similar strength and durability properties of that of conventional cement concrete. To understand the structural behaviour and crack development pattern, reinforced beams from Geopolymer concrete with fly ash and GGBS as source materials and that with OPC were cast and tested in laboratory. Two points loading was applied and observations were made till ultimate failure load. Also crack development patterns were studied. Similar tests were also done on the beams without reinforcement. From this study similarity in structural behaviour of beams with OPC and that of Geopolymer concrete from fly ash and GGBS can be revealed and hence it can be a potential material for construction industry in future.
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kalpa publications, 2017
Abstract— There have been increasing efforts in recent years to minimize the amount of cement use... more Abstract— There have been increasing efforts in recent years to minimize the amount of cement used in concrete. Efforts at partial replacement have been successful and regulations have been promulgated to standardize and use such successful formulations. There is now worldwide research aimed at complete replacement of cement by activating industrial materials that are rich in silica and alumina with alkaline solution. The present study was aimed at complete elimination of cement through the development of a geopolymer concrete containing fly ash and ground granulated blast furnace slag (GGBS), activated by sodium hydroxide based alkaline activators. The effect of replacing up to 50% fly ash by GGBS was also studied. The strength parameters were studied for a mixture of sodium silicate and sodium hydroxide solution having concentrations from 2M to 12M. The samples were cured under ambient conditions. Compressive and split tensile strengths of cubes and cylinders for all mixtures were measured on the 28th day of casting. Good compressive strength was attained with most of the mixtures. The overall data pertaining to compressive strength and chemical components along with curing temperature were collected and compiled to achieve generalized predictable results. Comparative charts were developed in terms of temperature, % of NaOH and SiO2/CaO for compressive strength.
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Construction of tall chimneys has been possible with the advent of latest building technologies a... more Construction of tall chimneys has been possible with the advent of latest building technologies and also with better understanding of loads acting on them to determine its structural behaviour. With the experience gained in the chimney design and construction over the years the present-day challenge is to prevent the deterioration of chimney shell and lining due to penetration of flue gases through cracks in the air space. Recently many chimneys have been designed considering borosilicate blocks as a lining material. It has also been reported about repairing the deteriorated chimney by removing the conventional fire bricks and applying borosilicate block on the chimney shell. In this paper, the engineering properties of both the lining materials are compared. Also, the analytical study has been done on 12 hypothetical chimneys with 100m, 150m and 200m height and the temperature varying at 150oC and 200oC to gauge the effectiveness borosilicate glass blocks in terms of temperature gradient, forces induced and material cost. The study shows that borosilicate block can be a suitable replacement of conventional fire bricks, used as lining for reinforced concrete chimneys, in terms of its application and its engineering properties that govern structural parameters.
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Proceedings of national conference on structural engineering, 2020
Abstract. Construction of tall chimneys is now the basic requirement and has been possible with t... more Abstract. Construction of tall chimneys is now the basic requirement and has been possible with the advent of latest building technologies and also with better understanding of loads acting on them to determine its structural behaviour. With the experience gained in the chimney design and construction over the years the present-day challenge is to prevent the deterioration of chimney shell and brick lining and thereby increase the service life of the structure. This deterioration is caused due to penetration of flue gases through cracks in the air space, which causes acid attacks and eventually leading to the mortar and concrete erosion. In recent years, many chimneys have been repaired or designed considering borosilicate glass blocks as lining material in lieu of conventional fire brick linings. This study has been done considering brick lining and borosilicate glass block lining for chimneys with 100m and 200m height with temperatures varying as 100oC, 150oC and 200oC. Total 12 chimneys were designed and comparison is done in terms of the overall cost of the material consumed in these chimneys. It was observed that the chimneys constructed with borosilicate blocks as a lining material were 10-12% cheaper than those constructed with conventional brick as a lining material.
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Kalpa Publications in Civil Engineering, 2017
There have been increasing efforts in recent years to minimize the amount of cement used in concr... more There have been increasing efforts in recent years to minimize the amount of cement used in concrete. Efforts at partial replacement have been successful and regulations have been promulgated to standardize and use such formulations. Research aimed at complete replacement of cement by activating industrial materials that are rich in silica and alumina with alkaline solutions is still on-going all over the world. The present study was aimed at complete elimination of cement through the development of a geopolymer concrete containing the mixture of fly ash and ground granulated blast furnace slag (GGBS), activated by sodium based alkaline activators. The effect of replacing up to 50% fly ash by GGBS was considered. The strength parameters were studied for a mixture of sodium silicate and sodium hydroxide solution having concentration 12M. The samples were cured under ambient conditions as well as in an oven at 60oC for 24 hours. Compressive and split tensile strengths of the samples were measured on 3rd, 7th, 14th, 28th, 56th and 90th days of casting. The cubes were also tested for durability parameters by ponding in NaCl and H2SO4 solution for 28 and 90 days. It was observed that replacing fly ash with 30% of GGBS gave the best results.
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Since last few years, Concrete Technologists are putting in continuous efforts to minimize the co... more Since last few years, Concrete Technologists are putting in continuous efforts to minimize the consumption of Portland cement in concrete. Cement concrete offering architectural freedom is second highest consumed material on earth. Portland cement production is one of the major causes of CO 2 emission in atmosphere. With limited natural resources and durability issues, a need is felt to lessen or curtail the use of cement in concrete and replace the same with immensely available industrial by-products. Partial replacement of Portland cement has been successful but research is still going on for its complete replacement by materials that are rich in Silica and Alumina. These materials, when activated by an alkaline solution exhibit similar strength and durability properties of that of conventional cement concrete. Present study emphasizes on studying potential application of GGBS, in presence of Sodium based alkaline activators, for developing Geopolymer concrete. Compressive strength development up to 90 days is studied for different molarities (2M-8M) of NaOH solution and varying temperature conditions (ambient and oven). Split tensile strength tests were done on cylinders on 28 th day of casting. From this study it is revealed that with the similarity in structural behaviour with conventional concrete, Geopolymer Concrete from GGBS can be a potential material for the construction industry in future.
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Conference Presentations by Aanal Shah
Proceedings of National conference of structural engineering, 2020
Abstract. Flat slabs structures are the structures with the slabs directly resting on the columns... more Abstract. Flat slabs structures are the structures with the slabs directly resting on the columns. Due to the absence of the beams the stiffness of the frames reduces resulting in poor performance under the action of lateral loads. The main concern in the flat slabs structures is punching shear that can lead to progressive collapse of the structure. These shear stresses are enhanced due to lateral loads or bi-axial moments which are transferred from slab column connection. This study focusses on effect of the shape of the columns Circular, L, T and Cross on punching shear stress with respect to Indian, American, European and British codes. Total 12 models of a 10 storey building were considered keeping the floor plan area (25m2) constant and varying the panel sizes (5m x 5m, 8.33m x 8.33m, 5m x 8.33m) as well as the shapes of the columns. The structures were analyzed and it was observed that while Eurocode 2 code was more on the conservative side, L and T shaped columns were more suitable in resisting punching shear stress.
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Papers by Aanal Shah
Conference Presentations by Aanal Shah