Somnath Ghosh

Jadavpur University | JU · Department of Civil Engineering

Wound and its treatment is one of the major health concerns throughout the globe. Various extrinsic and intrinsic factors can influence the dynamics of healing mechanism. One such extrinsic factor is moist environment in wound healing. The advantages of optimum hydration in wound healing are enhanced autolytic debridement, angiogenesis and accelera...

Purpose This paper aims to investigate the effect of delayed water curing on the mechanical and microstructural properties of fly ash-based geopolymer paste-blended with Ground Granulated Blast Furnace Slag (GGBS) with different rest periods. Design/methodology/approach The blended geopolymer paste was composed of GGBS (15 per cent of the total...

The present study aims to investigate the compressive strength and the underlying micro-structural change of fly ash geopolymer paste with silica fume and murram as supplements up to 10% and 2.5% of the total weight respectively. The workability property of the geopolymer paste samples was evaluated at a green state using a unique methodology based...

This article represents that the mechanical and microstructural properties and durability of fly ash-based geopolymers blended with silica fume and borax are better than those of conventional fly ash-based geopolymers. Fly ash itself contains the sources of silica and alumina which are required for geopolymerisation. But a sufficient amount of high...

A study was conducted to compare the properties of carbon-containing basic castables that incorporated graphite with and without a magnesium! aluminate sol-gel coating. A thin sol-gel coating of magnesium aluminate spinel was prepared from inexpensive precursors. The castable batch containing hydrophilic coated graphite required less water (9.5 mas...

The effect of synthesis parameter, silicon/aluminum molar ratio, on the engineering properties of alkali-activated blast-furnace paste has been investigated. The article presents the study of the compressive strength and microstructure of alkali-activated blast-furnace slag paste specimens prepared using sodium silicate and potassium hydroxide solu...

The effect of silicate content (SiO2/Na2O) of an activator on physical and mechanical properties of alkali-activated blast furnace slag paste has been investigated. The paste was produced by activating blast furnace slag with sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) solution. The SiO2/Na2O ratio varied from 0.2 to 1.2. The test specime...

The effect of fineness of ground granulated blast furnace slag (GGBFS) on engineering properties of alkali activated GGBFS has been investigated. The paste was produced by activating blast furnace slag with sodium silicate and potassium hydroxide solution. Seven types of GGBFS finenesses were used in the present study. The effect of fineness on eng...

The present experiment has been performed to assess the impact of temperatures on activator before mixing. In this program, a set of activators having 8% of Na2O by weight of fly ash were subjected to different temperatures ranging from 15 deg C to 90 deg C, for a period of 24 hours and 48 hours. The performances of geopolymer were investigated on...

This paper presents the results of an experimental investigation on performance of fly ash-based geopolymer pastes at elevated temperature exposure. Geopolymer paste specimens having Si/Al in the range 1.7–2.2, manufactured by activating low calcium fly ash with a mixture of sodium hydroxide and sodium silicate solution were subjected to temperatur...

An experimental investigation was conducted to study the mechanical as well as micro structural properties of recycled aggregate concrete (RAC) exposed to elevated temperature. Fly ash (as replacement of cement) was added while making concrete. Recycled aggregates are mixed with natural aggregates also to prepare concrete. Cubes and cylinder test s...

An experimental investigation was conducted to study the durability of recycled aggregate concrete (recycled aggregate coated with geopolymer / cement) exposed to different concentration of Sulphuric acid. A number of concrete mixes were prepared with uncoated recycled aggregates, cement coated recycled aggregates and geopolymer coated recycled agg...

An experimental investigation was conducted to study the effect of Na2O content on performance of fly ash based geopolymer pastes in magnesium sulfate solution. A study on changes in physical appearance and weight, residual compressive strength along with mineralogical and microstructural changes were made on geopolymer specimens exposed to 10% mag...

Durability of fly ash based geopolymer mortar specimens in Nitric acid solution was investigated on three different series of specimens manufactured by activating fly ash with a mixture of sodium hydroxide and sodium silicate solution containing Na2O ranging from 5% to 8% of fly ash. Specimens were exposed in 10% by weight Nitric acid solution up t...

This paper presents the results of an experimental study performed to investigate effect of incorporating silica fume in the fly ash geopolymer on its porosity and compressive strength. Geopolymer specimens were prepared by activating fly ash incorporated with additional silica fume in the range of 2.5% to 5% with a mixture of sodium hydroxide and...

An experimental investigation was conducted to study the performance of fly ash based geopolymer mortar specimens inMagnesium Sulphate solution. Specimens were manufactured from low calcium fly ash by activation with a mixture of SodiumHydroxide and Sodium Silicate solution and cured thermally. 10% by weight Magnesium Sulphate solution was usedto s...

An experimental program was carried out to study the effect of water absorption, apparent porosity and sorptivity on durability of fly ash based geopolymer mortar specimens in sulphuric acid solution. Low calcium Class F fly ash was activated by a mixture of NaOH and Na2SiO3 containing 5% to 8% Na2O with water to fly ash ratio of 0.33.The durabilit...

This paper presents a formulation of hypo-elasticity based RC beam model with bond-slip. Details of the constitutive model and analysis method used are provided. A procedure has been described to carry out three-dimensional analysis considering both geometrical as well as material nonlinearity for a simply supported RC beam employing finite element...

Geopolymer is a class of aluminosilicate binding materials synthesized by thermal activation of solid aluminosilicate base materials such as fly ash, metakaolin, GGBS etc., with an alkali metal hydroxide and silicate solution. These binders are currently attracting widespread attention due to their potential utilization as a high performance, envir...

Geopolymers are a new promising binder manufactured by activation of a solid aluminosilicate source material with a highly alkaline activating solution and aided by heat. Fly ash, considered to be a waste material is rich in silica and alumina and hence can be used as a source material for manufacture of Geopolymers. These binders have been reporte...

Summary This paper deals with the implementationof hypo-elasticitybased 3D constitu- tivemodelon Reinforced Concrete (RC) frame employingfiniteelement technique, which uses lower order isometric solid elements HCiS18 with enhanced assumed strain (EAS) formulation to evaluate load-deformation, internal stresses produced in the elastic regime. Due at...

The present paper reports the experimental results of a study conducted to assess the resistance of fly ash based Geopolymer mortar specimens in sulfuric acid. The program consisted immersion of geopolymer mortar samples having percentage Na2O ranging from 5% to 8% of fly ash in a 10% Sulfuric acid solution up to a period of 18 weeks and evaluation...

A procedure has been described to carry out three-dimensional elastic analysis of reinforced concrete beam employing finite element technique, which uses lower order elements, The proposed procedure utilizes 8-noded isometric solid /hexahedral elements HCiS18 with enhanced assumed strain (EAS) formulation, recently developed in the literature, to p...