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Papers by Subharajit Roy

Concrete has been used since Roman times for the development of infrastructure and housing, but i... more Concrete has been used since Roman times for the development of infrastructure and housing, but its basic components have remained the same. Three ingredients make up the dry mix: coarse aggregate, consisting of larger pieces of material like stones or gravel; fine aggregate, made up of smaller particles such as sand; and cement, a very fine powdered material that binds the mix together when water is added. As is it is well known, traditional or conventional concrete which is greyish in colour, but its high density prevents the passage of light through it, which means that it’s also impossible to distinguish colour, shapes and bodies through it. But with the addition of optical fibre to the concrete, light can be passed through the concrete from one end to another end which will very much improve the aesthetical and architectural properties of the concrete. Furthermore, addition of glass fibre can enhance the strength and stability parameter of the concrete. In this paper, main conc...

Fly ash, also known as “pulverized fuel ash” in many countries such as England, Northern Ireland,... more Fly ash, also known as “pulverized fuel ash” in
many countries such as England, Northern Ireland, and
Scotland etc. is a coal combustion product. It is composed of
fine particles of burnt fuels and fuel gases emitted from coalfired
boilers. Though it was causing severe air pollution, in the
past, fly ash was usually released into the atmosphere as it is
mainly a thermal waste of coal firing thermal plants. But
presently, according to air pollution control standards, it is
captured prior to release by fitting pollution control
equipment. Due to its pozzolanic nature, recycled fly ash is
usually used as the production of hydraulic cement and a
complete and/or partial replacement for Portland cement in
concrete production. Potential of fly ash as a material is not
only restricted to cement and concrete industries. It can be
utilized as a raw material for brick production, which will be a
positive answer towards both environmental and economic
complications. The purpose of this particular study is to
explore the performance of Geopolymer brick consists of fly
ash as one of its chief material. The bricks were casted with
clay soil to fly ash in the different proportion of 100:0, 80:20,
70:30, 60:40 and 50:50. Sodium fume solution was applied as
an alkaline-activator and a ratio 1:2 of water to NaOH
solution was used as the binder solution. With an optimum
water/binder ratio of 0.416 and adopted dimension of (200 X
100 X 100) mm. The experimental outcomes were compared
with locally available conventional bricks.

Concrete has been used since Roman times for the development of infrastructure and housing, but i... more Concrete has been used since Roman times for the development of infrastructure and housing, but its basic components have remained the same. Three ingredients make up the dry mix: coarse aggregate, consisting of larger pieces of material like stones or gravel; fine aggregate, made up of smaller particles such as sand; and cement, a very fine powdered material that binds the mix together when water is added. As is it is well known, traditional or conventional concrete which is greyish in colour, but its high density prevents the passage of light through it, which means that it's also impossible to distinguish colour, shapes and bodies through it. But with the addition of optical fibre to the concrete, light can be passed through the concrete from one end to another end which will very much improve the aesthetical and architectural properties of the concrete. Furthermore, addition of glass fibre can enhance the strength and stability parameter of the concrete. In this paper, main concentration is given to create a special type of concrete using different percentages of optical and glass fibre as additive, which will reduce the power consumption problem of the building, improves aesthetic appearance of it and practically implemented as a load bearing component.

IOSR Journal of Mechanical and Civil Engineering (IOSR - JMCE) , 2018

Concrete has been used since Roman times for the development of infrastructure and housing, but i... more Concrete has been used since Roman times for the development of infrastructure and housing, but its basic components have remained the same. Three ingredients make up the dry mix: coarse aggregate, consisting of larger pieces of material like stones or gravel; fine aggregate, made up of smaller particles such as sand; and cement, a very fine powdered material that binds the mix together when water is added. As is it is well known, traditional or conventional concrete which is greyish in colour, but its high density prevents the passage of light through it, which means that it's also impossible to distinguish colour, shapes and bodies through it. But with the addition of optical fibre to the concrete, light can be passed through the concrete from one end to another end which will very much improve the aesthetical and architectural properties of the concrete. Furthermore, addition of glass fibre can enhance the strength and stability parameter of the concrete. In this paper, main concentration is given to create a special type of concrete using different percentages of optical and glass fibre as additive, which will reduce the power consumption problem of the building, improves aesthetic appearance of it and practically implemented as a load bearing component.

Conference Presentations by Subharajit Roy

In this study, steel-reinforced concrete-filled ±55 • glass-fiber-reinforced-polymer (GFRP) tubes... more In this study, steel-reinforced concrete-filled ±55 • glass-fiber-reinforced-polymer (GFRP) tubes (CFFT) are examined under monotonic loading to understand their shear behaviour. A total of three test specimens with three different nominal pressure ratings (50, 100 and 150 Psi) were tested under threepoint bending. The pressure ratings are associated with the tube wall thickness. The shear span to depth ratio (a/D) was adopted as 1 for this study. The applied load for each test was measured using a 1.5MN load cell. The deflection at mid-span and the bond-slip measured with the help of a string potentiometer and linear potentiometers. The strains at the compression and tension regions were measured using strain gauges with a gauge length of 6mm. The test results show that the increase in the ultimate strength of the concrete-filled GFRP tubes was due to the increase in the wall thickness. All specimens failed in flexure: initial stretching of the tensile fibers with minor compression fracture development at the top and ultimately failed due to fracture at the tension fibers at mid-span. No significant amount of slip between concrete core-GFRP tube and steel reinforcement were recorded, which shows that the superior compositeness between the components of the test specimens. The importance of this study is to improve the understanding of shear and flexural behaviour of the CFFTs with ±55 • fiber orientation.

Concrete has been used since Roman times for the development of infrastructure and housing, but i... more Concrete has been used since Roman times for the development of infrastructure and housing, but its basic components have remained the same. Three ingredients make up the dry mix: coarse aggregate, consisting of larger pieces of material like stones or gravel; fine aggregate, made up of smaller particles such as sand; and cement, a very fine powdered material that binds the mix together when water is added. As is it is well known, traditional or conventional concrete which is greyish in colour, but its high density prevents the passage of light through it, which means that it's also impossible to distinguish colour, shapes and bodies through it. But with the addition of optical fibre to the concrete, light can be passed through the concrete from one end to another end which will very much improve the aesthetical and architectural properties of the concrete. Furthermore, addition of glass fibre can enhance the strength and stability parameter of the concrete. In this paper, main concentration is given to create a special type of concrete using different percentages of optical and glass fibre as additive, which will reduce the power consumption problem of the building, improves aesthetic appearance of it and practically implemented as a load bearing component.

IOSR Journal of Mechanical and Civil Engineering (IOSR - JMCE) , 2018

Concrete has been used since Roman times for the development of infrastructure and housing, but i... more Concrete has been used since Roman times for the development of infrastructure and housing, but its basic components have remained the same. Three ingredients make up the dry mix: coarse aggregate, consisting of larger pieces of material like stones or gravel; fine aggregate, made up of smaller particles such as sand; and cement, a very fine powdered material that binds the mix together when water is added. As is it is well known, traditional or conventional concrete which is greyish in colour, but its high density prevents the passage of light through it, which means that it's also impossible to distinguish colour, shapes and bodies through it. But with the addition of optical fibre to the concrete, light can be passed through the concrete from one end to another end which will very much improve the aesthetical and architectural properties of the concrete. Furthermore, addition of glass fibre can enhance the strength and stability parameter of the concrete. In this paper, main concentration is given to create a special type of concrete using different percentages of optical and glass fibre as additive, which will reduce the power consumption problem of the building, improves aesthetic appearance of it and practically implemented as a load bearing component.