Ashish Tiwari | Thapar University, Patiala (original) (raw)

Papers by Ashish Tiwari

Research paper thumbnail of Analysis of Concrete Wall under Blast Loading

The terrorist attacks and threats are the growing problem all over the world that not only affect... more The terrorist attacks and threats are the growing problem all over the world that not only affect the life of human being but also affect the structure integrity and its resistance. Explosive devices, human bomb and the other bomb equipments are the major weapon choices for these attacks, significantly threatens civilians and military personnel. As we know that ceasefire and bombing activities are increasing day by day also the terrorist attacks on major buildings can cause catastrophic failure on the building's external and internal structural frames, collapsing of walls and shutting down of critical lifesafety system. Because of all these threat from such extreme condition, effort has been made from the last few decades to find suitable method of structural analysis and design to resist blast load. Detail understanding is required about the blast phenomena and the propagation of waves towards the structure and also response of structure against such shock waves. This paper presents a comprehensive study of concrete wall against this dynamic loading. Concrete wall subjected to blast loading is modeled in Finite Element package Ansys and then analyzed in Autodyn with and without steel plate to study the impact of blast loading.

Research paper thumbnail of Developing the inhibition mechanism for amide-based amino acids in carbonated concrete environment and assessing the migration ability in concrete

Journal of building engineering, Oct 1, 2023

Research paper thumbnail of Surface application of multifunctional compound to prevent and control combined chloride and carbonation corrosion in concrete

European Journal of Environmental and Civil Engineering

Research paper thumbnail of Assessment of corrosion inhibition efficiency of generic compounds having different functional groups in carbonated pore solution with chlorides and migration ability in concrete

Construction and Building Materials, 2021

Abstract In the present study, corrosion inhibition effect of generic compounds in simulated carb... more Abstract In the present study, corrosion inhibition effect of generic compounds in simulated carbonated pore solution contaminated by chloride ions (Cl-) was investigated. The performance of two generic compounds, namely Triethylphosphate (TEP) and Salicyaldehyde (SA) at varying concentrations was investigated by electrochemical measurement technique (potentiodynamic polarization curves), optical microscopy, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and Fourier transform infrared spectroscopy (FTIR). The test results in simulated pore solution show that both TEP and SA reduced the corrosion rate irrespective to the tested concentration levels. It is found that efficiency of TEP increases from 65.36% to 83.18% with increase in concentration from 0.05 M to 0.2 M; while efficiency of SA was as high as 96.4% even at 0.05 M concentration. Surface analysis data confirms that corrosion product on specimen immersed in contaminated environment contains FeOOH, Fe2O3 and Fe3O4, while presence of phosphate group in TEP able reduce the formation of corrosion product. SEM and EDS data shows the formation of protective layer on specimen immersed in SA admixed solution that contains higher C and O content. The spectra band obtain by FTIR confirms the adsorption of SA through the interaction of CHO and phenolate ion with metal surface. The mechanism of inhibition revolves around the type of heteroatom present within the molecular structure. While TEP retarded the corrosion of rebar by advancing the iron oxide film growth and healing the defects present in the protective film; SA formed an adsorptive black layer over the exposed surface by chelation process. Out of the two compounds, the inhibition efficiency of SA was as high as 99%. The best performing compound was further applied on the concrete surface to check its migration ability through the cover concrete. The percolation ability was determined by using thin layer chromatography (TLC) and ultraviolet–visible spectroscopy (UV–Vis). The tests conducted on the powdered samples collected from various depths at different time intervals confirmed the percolation potential of the generic compound. Overall, it can be concluded that SA has the potential to act as migratory inhibitor to retard rebar corrosion in the dual corrosive environment of chlorides and carbonation.

Research paper thumbnail of Influence of corrosion inhibitors on two different concrete systems under combined chloride and carbonated environment

Research paper thumbnail of A Review of Building Information Modelling Techniques

Recent evolution of building information modeling (BIM) and its encouraged use of virtual design ... more Recent evolution of building information modeling (BIM) and its encouraged use of virtual design and construction (VDC) in the architecture, engineering, and construction (AEC) industry are fundamentally changing the process by which buildings are designed and constructed. In today's century engineer and architect must be able to deal with a rapid pace of technological changes, a highly interconnected world, and complex problems that require multidisciplinary solutions. This paper focuses about the BIM, its applications, how it enhance the career and its impact on the various Fields

Research paper thumbnail of Evaluation of inhibition efficiency of generic compounds with additional heteroatom in simulated concrete pore solution and migration potential in concrete

Journal of Building Engineering, 2021

Abstract In the present study,the performance of two generic compounds, namely 2-Aminopyridine (A... more Abstract In the present study,the performance of two generic compounds, namely 2-Aminopyridine (AP) and 4-Aminobenzoic acid (ABA) at varying concentrations in carbonated pore solution contaminated by chlorides was investigated by using electrochemical measurement technique (potentiodynamic polarization curves) and surface analysis technique (optical microscope, SEM, EDX, XRD and FTIR). The migration ability of the two compounds in concrete was also investigated by using thin layer chromatography (TLC) and ultraviolet-visible spectroscopy (UV-Vis).The test results in simulated pore solution showed that both AP and ABA lowered the rate of corrosion irrespective of the tested concentration levels. Surface analysis data shows that corrosion product on specimen immersed in contaminated environment contains FeOOH, Fe2O3 and Fe3O4. From the electrochemical data, it was confirmed that AP behave like mixed kind of inhibitor and blocks both the anodic and cathodic reactions on the surface of steel rebar; which is supported by surface analysis data showingthe presence of Fe (88.07%) on the surface of specimen. ABA protected the steel rebar by forming a protective layer containing higher C and O content. The spectra band of the bar in ABA mixed solution obtained by FTIR confirmed the presence of protective film in the form of chelate ring formed by –COO- on the specimen surface. The mechanism of inhibition revolves around the presence of heteroatoms within the molecular structure.While AP retarded the corrosion of rebar by forming a thin adsorption layer and restricted the corrosion mechanism, ABA formed an adsorptive black layer over the exposed surface by chelation process.Selected compounds were further applied on the concrete surface to check its migration ability through the cover concrete. Overall, it can be concluded that both the compounds have the potential to act as migratory inhibitor to retard rebar corrosion in the dual corrosive environment of chlorides and carbonation.

Research paper thumbnail of Analysis of Concrete Wall under Blast Loading

The terrorist attacks and threats are the growing problem all over the world that not only affect... more The terrorist attacks and threats are the growing problem all over the world that not only affect the life of human being but also affect the structure integrity and its resistance. Explosive devices, human bomb and the other bomb equipments are the major weapon choices for these attacks, significantly threatens civilians and military personnel. As we know that ceasefire and bombing activities are increasing day by day also the terrorist attacks on major buildings can cause catastrophic failure on the building's external and internal structural frames, collapsing of walls and shutting down of critical lifesafety system. Because of all these threat from such extreme condition, effort has been made from the last few decades to find suitable method of structural analysis and design to resist blast load. Detail understanding is required about the blast phenomena and the propagation of waves towards the structure and also response of structure against such shock waves. This paper presents a comprehensive study of concrete wall against this dynamic loading. Concrete wall subjected to blast loading is modeled in Finite Element package Ansys and then analyzed in Autodyn with and without steel plate to study the impact of blast loading.

Research paper thumbnail of Developing the inhibition mechanism for amide-based amino acids in carbonated concrete environment and assessing the migration ability in concrete

Journal of building engineering, Oct 1, 2023

Research paper thumbnail of Surface application of multifunctional compound to prevent and control combined chloride and carbonation corrosion in concrete

European Journal of Environmental and Civil Engineering

Research paper thumbnail of Assessment of corrosion inhibition efficiency of generic compounds having different functional groups in carbonated pore solution with chlorides and migration ability in concrete

Construction and Building Materials, 2021

Abstract In the present study, corrosion inhibition effect of generic compounds in simulated carb... more Abstract In the present study, corrosion inhibition effect of generic compounds in simulated carbonated pore solution contaminated by chloride ions (Cl-) was investigated. The performance of two generic compounds, namely Triethylphosphate (TEP) and Salicyaldehyde (SA) at varying concentrations was investigated by electrochemical measurement technique (potentiodynamic polarization curves), optical microscopy, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and Fourier transform infrared spectroscopy (FTIR). The test results in simulated pore solution show that both TEP and SA reduced the corrosion rate irrespective to the tested concentration levels. It is found that efficiency of TEP increases from 65.36% to 83.18% with increase in concentration from 0.05 M to 0.2 M; while efficiency of SA was as high as 96.4% even at 0.05 M concentration. Surface analysis data confirms that corrosion product on specimen immersed in contaminated environment contains FeOOH, Fe2O3 and Fe3O4, while presence of phosphate group in TEP able reduce the formation of corrosion product. SEM and EDS data shows the formation of protective layer on specimen immersed in SA admixed solution that contains higher C and O content. The spectra band obtain by FTIR confirms the adsorption of SA through the interaction of CHO and phenolate ion with metal surface. The mechanism of inhibition revolves around the type of heteroatom present within the molecular structure. While TEP retarded the corrosion of rebar by advancing the iron oxide film growth and healing the defects present in the protective film; SA formed an adsorptive black layer over the exposed surface by chelation process. Out of the two compounds, the inhibition efficiency of SA was as high as 99%. The best performing compound was further applied on the concrete surface to check its migration ability through the cover concrete. The percolation ability was determined by using thin layer chromatography (TLC) and ultraviolet–visible spectroscopy (UV–Vis). The tests conducted on the powdered samples collected from various depths at different time intervals confirmed the percolation potential of the generic compound. Overall, it can be concluded that SA has the potential to act as migratory inhibitor to retard rebar corrosion in the dual corrosive environment of chlorides and carbonation.

Research paper thumbnail of Influence of corrosion inhibitors on two different concrete systems under combined chloride and carbonated environment

Research paper thumbnail of A Review of Building Information Modelling Techniques

Recent evolution of building information modeling (BIM) and its encouraged use of virtual design ... more Recent evolution of building information modeling (BIM) and its encouraged use of virtual design and construction (VDC) in the architecture, engineering, and construction (AEC) industry are fundamentally changing the process by which buildings are designed and constructed. In today's century engineer and architect must be able to deal with a rapid pace of technological changes, a highly interconnected world, and complex problems that require multidisciplinary solutions. This paper focuses about the BIM, its applications, how it enhance the career and its impact on the various Fields

Research paper thumbnail of Evaluation of inhibition efficiency of generic compounds with additional heteroatom in simulated concrete pore solution and migration potential in concrete

Journal of Building Engineering, 2021

Abstract In the present study,the performance of two generic compounds, namely 2-Aminopyridine (A... more Abstract In the present study,the performance of two generic compounds, namely 2-Aminopyridine (AP) and 4-Aminobenzoic acid (ABA) at varying concentrations in carbonated pore solution contaminated by chlorides was investigated by using electrochemical measurement technique (potentiodynamic polarization curves) and surface analysis technique (optical microscope, SEM, EDX, XRD and FTIR). The migration ability of the two compounds in concrete was also investigated by using thin layer chromatography (TLC) and ultraviolet-visible spectroscopy (UV-Vis).The test results in simulated pore solution showed that both AP and ABA lowered the rate of corrosion irrespective of the tested concentration levels. Surface analysis data shows that corrosion product on specimen immersed in contaminated environment contains FeOOH, Fe2O3 and Fe3O4. From the electrochemical data, it was confirmed that AP behave like mixed kind of inhibitor and blocks both the anodic and cathodic reactions on the surface of steel rebar; which is supported by surface analysis data showingthe presence of Fe (88.07%) on the surface of specimen. ABA protected the steel rebar by forming a protective layer containing higher C and O content. The spectra band of the bar in ABA mixed solution obtained by FTIR confirmed the presence of protective film in the form of chelate ring formed by –COO- on the specimen surface. The mechanism of inhibition revolves around the presence of heteroatoms within the molecular structure.While AP retarded the corrosion of rebar by forming a thin adsorption layer and restricted the corrosion mechanism, ABA formed an adsorptive black layer over the exposed surface by chelation process.Selected compounds were further applied on the concrete surface to check its migration ability through the cover concrete. Overall, it can be concluded that both the compounds have the potential to act as migratory inhibitor to retard rebar corrosion in the dual corrosive environment of chlorides and carbonation.