Pub Date : 2022-06-17DOI: 10.1080/24705314.2022.2048243
M. Ghanbari, M. J. Ranjbar Naserabadi, F. Mirzadeh
ABSTRACT A pressurized gas separator vessel was scanned to detect the possible discontinuities using a Phased Array Ultrasonic Testing (PAUT) device. Ultrasonic results from Hydrogen-Induced Cracks (HICs) at different depths were considered to represent the evaluation procedure. Final results were then generated for implementing Fitness-for-Service (FFS) procedure. After considering FFS procedures, it was found that some of the discontinuities are not acceptable due to their sizes or locations. Based on the simulated model results, including fracture analysis of cracks and generating Failure Analysis Diagrams (FAD), it can be inferred that the vessel is not acceptable to be in the current service operation condition and should be replaced.
{"title":"Evaluation of a pressure vessel using failure analysis diagram based on phased array ultrasonic testing data","authors":"M. Ghanbari, M. J. Ranjbar Naserabadi, F. Mirzadeh","doi":"10.1080/24705314.2022.2048243","DOIUrl":"https://doi.org/10.1080/24705314.2022.2048243","url":null,"abstract":"ABSTRACT A pressurized gas separator vessel was scanned to detect the possible discontinuities using a Phased Array Ultrasonic Testing (PAUT) device. Ultrasonic results from Hydrogen-Induced Cracks (HICs) at different depths were considered to represent the evaluation procedure. Final results were then generated for implementing Fitness-for-Service (FFS) procedure. After considering FFS procedures, it was found that some of the discontinuities are not acceptable due to their sizes or locations. Based on the simulated model results, including fracture analysis of cracks and generating Failure Analysis Diagrams (FAD), it can be inferred that the vessel is not acceptable to be in the current service operation condition and should be replaced.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"7 1","pages":"198 - 205"},"PeriodicalIF":2.1,"publicationDate":"2022-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44593973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-13DOI: 10.1080/24705314.2021.2018890
A. Nassef
ABSTRACT This paper has proposed a new formula relating the damage state and effective state of the flexural member, this formula enables studying different concrete healing variables. A new relation between the effective reinforced concrete healing/damage variable and the effective healing/ damage variables of concrete and steel has been introduced to relate concrete and steel healing/ damage and the reinforced concrete healing/ damage. The proposed formula has been verified with experimental results of full-healed flexural members, it has achieved good agreement. The flexural member stiffness has been studied considering different parameters like concrete healing variables, concrete cover and percentage of steel reinforcement. The flexural member stiffness has increased as the concrete healing variable has increased, it has increased as the concrete cover has increased and the steel reinforcement percentage of 1% has given the higher flexural member stiffness.
{"title":"Nonlinear healing approach for reinforced concrete beams","authors":"A. Nassef","doi":"10.1080/24705314.2021.2018890","DOIUrl":"https://doi.org/10.1080/24705314.2021.2018890","url":null,"abstract":"ABSTRACT This paper has proposed a new formula relating the damage state and effective state of the flexural member, this formula enables studying different concrete healing variables. A new relation between the effective reinforced concrete healing/damage variable and the effective healing/ damage variables of concrete and steel has been introduced to relate concrete and steel healing/ damage and the reinforced concrete healing/ damage. The proposed formula has been verified with experimental results of full-healed flexural members, it has achieved good agreement. The flexural member stiffness has been studied considering different parameters like concrete healing variables, concrete cover and percentage of steel reinforcement. The flexural member stiffness has increased as the concrete healing variable has increased, it has increased as the concrete cover has increased and the steel reinforcement percentage of 1% has given the higher flexural member stiffness.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"7 1","pages":"120 - 127"},"PeriodicalIF":2.1,"publicationDate":"2022-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49023362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-13DOI: 10.1080/24705314.2021.2018841
H. Mehdi, R. Resatoglu
ABSTRACT The occurrence of past serious earthquakes led to the demolition of most of already built reinforced concrete (RC) structures due to improper seismic design. Further studies showed that reduced ductility and low shear strength were the main reasons for the failure of structural members (such as columns). Hence, considering the incorporation of shear strength and ductility in structural design became vital to enhance resistance to environmental loads (such as earthquake). Low-strength concrete is generally in practice in the progressing countries like Pakistan. Different approaches and methods have been used to retrofit and repair the ageing structures using different techniques. The present study focuses on the experimental investigation of confining of concrete columns by pre-tensioning carbon fibre-reinforced polymer (CFRP) with expanding grout. A number of concrete cylinder specimens were prepared using selected quantities of expanding grout, which produced various initial pressures. The behaviour of pre-tensioned confined concrete with non-pre-tensioned confined and unconfined concrete was compared. It was also indicated that using CFRP along with expanding grout can enhance the engineering properties (axial stress and elastic modulus) of columns. It was comprehended that an increment in the initial confining pressure resulted in increment in axial stress as well as axial and lateral strains.
{"title":"Confinement of concrete columns using CFRP and expanded grout","authors":"H. Mehdi, R. Resatoglu","doi":"10.1080/24705314.2021.2018841","DOIUrl":"https://doi.org/10.1080/24705314.2021.2018841","url":null,"abstract":"ABSTRACT The occurrence of past serious earthquakes led to the demolition of most of already built reinforced concrete (RC) structures due to improper seismic design. Further studies showed that reduced ductility and low shear strength were the main reasons for the failure of structural members (such as columns). Hence, considering the incorporation of shear strength and ductility in structural design became vital to enhance resistance to environmental loads (such as earthquake). Low-strength concrete is generally in practice in the progressing countries like Pakistan. Different approaches and methods have been used to retrofit and repair the ageing structures using different techniques. The present study focuses on the experimental investigation of confining of concrete columns by pre-tensioning carbon fibre-reinforced polymer (CFRP) with expanding grout. A number of concrete cylinder specimens were prepared using selected quantities of expanding grout, which produced various initial pressures. The behaviour of pre-tensioned confined concrete with non-pre-tensioned confined and unconfined concrete was compared. It was also indicated that using CFRP along with expanding grout can enhance the engineering properties (axial stress and elastic modulus) of columns. It was comprehended that an increment in the initial confining pressure resulted in increment in axial stress as well as axial and lateral strains.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"7 1","pages":"128 - 135"},"PeriodicalIF":2.1,"publicationDate":"2022-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44058159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-13DOI: 10.1080/24705314.2021.2019178
S. Chu, Chan-Jung Kang, Mingqing Hu, Liang-Chieh Chang
ABSTRACT This study presents a damage assessment scheme for seismically excited torsion-coupled nonlinear buildings based on the normalized relative displacement vibration shape (NRDVS). In order to investigate the applicability of the proposed NRDVS, the relative displacements are obtained from a real-time structural response integrator (RTSRI) by integrating the relative accelerations simulated from multiple-degree-of-freedom nonlinear models. As a result, the normalized inter-story drift ratio (NIDR) calculated by differencing the normalized displacements of the two successive floors of NRDVS and dividing by the story height can reveal the damaged floors as well as the location of damaged building members. Furthermore, the proposed damage assessment scheme is validated by observing the experimental measurements of shaking table tests of three 1/3 scaled-down two-story reinforced concrete school building models conducted at the National Center for Research on Earthquake Engineering (NCREE), Taipei, Taiwan.
{"title":"Rapid damage assessment of 1/3 scaled-down two-story reinforced concrete school building models","authors":"S. Chu, Chan-Jung Kang, Mingqing Hu, Liang-Chieh Chang","doi":"10.1080/24705314.2021.2019178","DOIUrl":"https://doi.org/10.1080/24705314.2021.2019178","url":null,"abstract":"ABSTRACT This study presents a damage assessment scheme for seismically excited torsion-coupled nonlinear buildings based on the normalized relative displacement vibration shape (NRDVS). In order to investigate the applicability of the proposed NRDVS, the relative displacements are obtained from a real-time structural response integrator (RTSRI) by integrating the relative accelerations simulated from multiple-degree-of-freedom nonlinear models. As a result, the normalized inter-story drift ratio (NIDR) calculated by differencing the normalized displacements of the two successive floors of NRDVS and dividing by the story height can reveal the damaged floors as well as the location of damaged building members. Furthermore, the proposed damage assessment scheme is validated by observing the experimental measurements of shaking table tests of three 1/3 scaled-down two-story reinforced concrete school building models conducted at the National Center for Research on Earthquake Engineering (NCREE), Taipei, Taiwan.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"7 1","pages":"110 - 119"},"PeriodicalIF":2.1,"publicationDate":"2022-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43934961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-13DOI: 10.1080/24705314.2021.2018792
Seungjea Lee, Ji-Eon Lee, N. Dinh, K. Choi
ABSTRACT This paper presents a seismic investigation of an uninterruptible power supply system (UPS) through triaxial shake table tests. A 100-kVA uninterruptible power supply system compliant with IEC-60950 was selected as the test specimen. The input acceleration time histories were generated based on the ICC-ES AC156 code, with scaling factors ranging from 25% to 600%. Based on the test results, the damage of the UPS and dynamic characteristics of this device were evaluated and explained in terms of fundamental frequency, damping ratio, acceleration time history response, dynamic amplification factor, and relative displacement. In addition, a simplified analytical model was proposed, and a parametric study was conducted to understand the dynamic characteristics of the UPS.
{"title":"Time history analysis for investigation of dynamic behavioral characteristics of uninterruptible power supply system","authors":"Seungjea Lee, Ji-Eon Lee, N. Dinh, K. Choi","doi":"10.1080/24705314.2021.2018792","DOIUrl":"https://doi.org/10.1080/24705314.2021.2018792","url":null,"abstract":"ABSTRACT This paper presents a seismic investigation of an uninterruptible power supply system (UPS) through triaxial shake table tests. A 100-kVA uninterruptible power supply system compliant with IEC-60950 was selected as the test specimen. The input acceleration time histories were generated based on the ICC-ES AC156 code, with scaling factors ranging from 25% to 600%. Based on the test results, the damage of the UPS and dynamic characteristics of this device were evaluated and explained in terms of fundamental frequency, damping ratio, acceleration time history response, dynamic amplification factor, and relative displacement. In addition, a simplified analytical model was proposed, and a parametric study was conducted to understand the dynamic characteristics of the UPS.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"7 1","pages":"91 - 109"},"PeriodicalIF":2.1,"publicationDate":"2022-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47315592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ABSTRACT Earthquakes are a potential hazard for offshore wind turbines (OWTs) located in seismically active regions. In this study, a coupled seismic analysis model for an OWT under earthquake, wind, and wave loads is established, and a typical feather fault caused by damage to electrical devices is modeled. Then, the dynamic characteristics of the feather fault OWT are studied under earthquake conditions. The influences of stochastic winds and waves on the seismic responses are also investigated. The passive control method of multiple tuned mass damper (MTMD) is designed and applied to the feather fault OWT, based on the dominant natural modes of the seismic responses. Further, the applicability and effectiveness of the designed MTMD are evaluated, based on reductions in the responses of the feather fault OWT under earthquakes in the time and frequency domains.
{"title":"Passive control of feather fault offshore wind turbine under combined earthquake wind and wave loads","authors":"Zuxing Pan, Wen-hua Wang, Xin Li, Fabo Chen, Zhenqiang Jiang","doi":"10.1080/24705314.2021.2018842","DOIUrl":"https://doi.org/10.1080/24705314.2021.2018842","url":null,"abstract":"ABSTRACT Earthquakes are a potential hazard for offshore wind turbines (OWTs) located in seismically active regions. In this study, a coupled seismic analysis model for an OWT under earthquake, wind, and wave loads is established, and a typical feather fault caused by damage to electrical devices is modeled. Then, the dynamic characteristics of the feather fault OWT are studied under earthquake conditions. The influences of stochastic winds and waves on the seismic responses are also investigated. The passive control method of multiple tuned mass damper (MTMD) is designed and applied to the feather fault OWT, based on the dominant natural modes of the seismic responses. Further, the applicability and effectiveness of the designed MTMD are evaluated, based on reductions in the responses of the feather fault OWT under earthquakes in the time and frequency domains.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"7 1","pages":"75 - 90"},"PeriodicalIF":2.1,"publicationDate":"2022-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49163833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-02DOI: 10.1080/24705314.2021.1971890
V. Nazimko
ABSTRACT The purpose of this research was to provide structural integrity, increase the bearing capacity and safety of the yield frame supports used in heavy underground conditions. Actual measurements in situ, loading of the frames by testing machine, physical modelling and thermodynamics of irreversible processes verified that the frame clamps yield asynchronously, by turn, each after other in the conventional frame supports that cause their blocking, jamming and destroying. Connecting the opposite clamps with a flexible element synchronizes the yield of the opposite fasteners and prevents their failure. Coherent behaviour of the clamps increased bearing capacity of the frames by factor 1.73.
{"title":"Synchronization of the yield as a way to increase integrity and bearing capacity of the frame supports","authors":"V. Nazimko","doi":"10.1080/24705314.2021.1971890","DOIUrl":"https://doi.org/10.1080/24705314.2021.1971890","url":null,"abstract":"ABSTRACT The purpose of this research was to provide structural integrity, increase the bearing capacity and safety of the yield frame supports used in heavy underground conditions. Actual measurements in situ, loading of the frames by testing machine, physical modelling and thermodynamics of irreversible processes verified that the frame clamps yield asynchronously, by turn, each after other in the conventional frame supports that cause their blocking, jamming and destroying. Connecting the opposite clamps with a flexible element synchronizes the yield of the opposite fasteners and prevents their failure. Coherent behaviour of the clamps increased bearing capacity of the frames by factor 1.73.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"7 1","pages":"1 - 14"},"PeriodicalIF":2.1,"publicationDate":"2022-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46025815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-02DOI: 10.1080/24705314.2021.1971893
K. Park, Gil-Oh Kim, Jung-Gil Kim, Y. Roh
ABSTRACT Behaviors associated with the mechanical responses of a Kelvin unit cell can be improved by optimizing the parameter sets. Herein, we present a shape control method for a Kelvin unit cell by functionalizing the coordinates of 24 vertices. Further, we verified the physical properties of Kelvin lattice structures using relative density and lattice patterning through finite element analysis (FEA). Consequently, we devised a design method for the Kelvin unit cell that can control the cell aspect ratio. Furthermore, we estimated the relative density using the strut section and interior angles of a hexagon as variables, and achieved an accuracy of 96.3–99.7%. The FEA results revealed that with an increase in the relative density of the 1 × 1 × 1 lattice structure of titanium alloy to 0.00800, 0.03065, 0.11194, 0.22789 and 0.36246, the yield strength sharply increased to 0.67, 2.79, 10.23, 27.27 and 51.82 MPa, respectively. When the 1 × 1 × 1, 2 × 2 × 2, 3 × 3 × 3 and 4 × 4 × 4 lattice structures were configured with mm, the yield strength of the lattice structure converged in the 3 × 3 × 3 pattern.
{"title":"Mechanical properties of additive manufactured variable-density Kelvin lattice structures: a novel design method for Kelvin unit cells","authors":"K. Park, Gil-Oh Kim, Jung-Gil Kim, Y. Roh","doi":"10.1080/24705314.2021.1971893","DOIUrl":"https://doi.org/10.1080/24705314.2021.1971893","url":null,"abstract":"ABSTRACT Behaviors associated with the mechanical responses of a Kelvin unit cell can be improved by optimizing the parameter sets. Herein, we present a shape control method for a Kelvin unit cell by functionalizing the coordinates of 24 vertices. Further, we verified the physical properties of Kelvin lattice structures using relative density and lattice patterning through finite element analysis (FEA). Consequently, we devised a design method for the Kelvin unit cell that can control the cell aspect ratio. Furthermore, we estimated the relative density using the strut section and interior angles of a hexagon as variables, and achieved an accuracy of 96.3–99.7%. The FEA results revealed that with an increase in the relative density of the 1 × 1 × 1 lattice structure of titanium alloy to 0.00800, 0.03065, 0.11194, 0.22789 and 0.36246, the yield strength sharply increased to 0.67, 2.79, 10.23, 27.27 and 51.82 MPa, respectively. When the 1 × 1 × 1, 2 × 2 × 2, 3 × 3 × 3 and 4 × 4 × 4 lattice structures were configured with mm, the yield strength of the lattice structure converged in the 3 × 3 × 3 pattern.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"7 1","pages":"34 - 45"},"PeriodicalIF":2.1,"publicationDate":"2022-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49239175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-02DOI: 10.1080/24705314.2021.1971892
Shaik Hussain, Dipendu Bhunia, S. Singh, J. Yadav
ABSTRACT Carbonation of concrete has always been a durability concern leading to the corrosion of steel in reinforced concrete. The present paper deals with carbonation resistance of cement mortar and concrete when supplementary cementitious materials like fly ash and blast furnace slag partially replaces cement. The work had been carried out in two phases, first being the measure of carbonation depth and compressive strength of the samples with water binder ratios of 0.35, 0.5 and 0.65 to train the artificial neural network. Based on the results from carbonation depth, the consistency of Fick’s law of diffusion that governs the carbon dioxide (CO2) ingress into concrete has been ascertained with the help of linear-programming problem. In the second phase of the study, cement mortar samples of water binder ratios 0.4, 0.5 and 0.6 had been tested to verify the reliability of phenolphthalein indicator in identifying the depth of carbonation with the help of microscopic analysis such as Thermo gravimetric analysis (TGA). The same specimens have been used to identify the phases of crystalline materials of post-carbonation samples using X-Ray diffraction (XRD). An attempt has been made to quantify the carbonated products of calcium hydroxides and C-S-H.
{"title":"A study on the carbonation of binary and ternary blended cement mortar and concrete","authors":"Shaik Hussain, Dipendu Bhunia, S. Singh, J. Yadav","doi":"10.1080/24705314.2021.1971892","DOIUrl":"https://doi.org/10.1080/24705314.2021.1971892","url":null,"abstract":"ABSTRACT Carbonation of concrete has always been a durability concern leading to the corrosion of steel in reinforced concrete. The present paper deals with carbonation resistance of cement mortar and concrete when supplementary cementitious materials like fly ash and blast furnace slag partially replaces cement. The work had been carried out in two phases, first being the measure of carbonation depth and compressive strength of the samples with water binder ratios of 0.35, 0.5 and 0.65 to train the artificial neural network. Based on the results from carbonation depth, the consistency of Fick’s law of diffusion that governs the carbon dioxide (CO2) ingress into concrete has been ascertained with the help of linear-programming problem. In the second phase of the study, cement mortar samples of water binder ratios 0.4, 0.5 and 0.6 had been tested to verify the reliability of phenolphthalein indicator in identifying the depth of carbonation with the help of microscopic analysis such as Thermo gravimetric analysis (TGA). The same specimens have been used to identify the phases of crystalline materials of post-carbonation samples using X-Ray diffraction (XRD). An attempt has been made to quantify the carbonated products of calcium hydroxides and C-S-H.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"7 1","pages":"46 - 60"},"PeriodicalIF":2.1,"publicationDate":"2022-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45264240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-02DOI: 10.1080/24705314.2021.1892571
Shashikant Kumar, B. Rai
ABSTRACT This paper is focused on the feasibility of replacing the cement with industrial wastes like fly ash (FA) and silica fume (SF). The goal is to improve the mechanical and durability characteristics of self-compacting concrete (SCC) and to find an application of high volume fly ash (HVFA) in SCC which can be environmentally sustainable. In this study, the replacement of cement with FA has been examined in various proportions from 0% to 100%. The durability properties of different SCC mixtures such as sorptivity and chloride ion penetration resistance were investigated. Similar tests were carried out with the incorporation of SF from 2% to 10% to the HVFA-SCC mixes. The mechanical properties of HVFA-SCC were significantly influenced by SF additions to the mixes. These mixtures showed low water penetrability and high resistance to penetration of chloride ion. Based on the experimental findings a relationship between sorptivity and chloride ion permeability has been projected. The synergetic effect of FA and SF on the performance of HVFA-SCC was done using the Scanning Electron Microscope (SEM) and X-Ray Diffraction (XRD) techniques. The study gives an indication of synergy arising from the pozzolanic activity and filler effects of SF in HVFA-SCC mixes.
{"title":"Synergetic effect of fly ash and silica fume on the performance of high volume fly ash self-compacting concrete","authors":"Shashikant Kumar, B. Rai","doi":"10.1080/24705314.2021.1892571","DOIUrl":"https://doi.org/10.1080/24705314.2021.1892571","url":null,"abstract":"ABSTRACT This paper is focused on the feasibility of replacing the cement with industrial wastes like fly ash (FA) and silica fume (SF). The goal is to improve the mechanical and durability characteristics of self-compacting concrete (SCC) and to find an application of high volume fly ash (HVFA) in SCC which can be environmentally sustainable. In this study, the replacement of cement with FA has been examined in various proportions from 0% to 100%. The durability properties of different SCC mixtures such as sorptivity and chloride ion penetration resistance were investigated. Similar tests were carried out with the incorporation of SF from 2% to 10% to the HVFA-SCC mixes. The mechanical properties of HVFA-SCC were significantly influenced by SF additions to the mixes. These mixtures showed low water penetrability and high resistance to penetration of chloride ion. Based on the experimental findings a relationship between sorptivity and chloride ion permeability has been projected. The synergetic effect of FA and SF on the performance of HVFA-SCC was done using the Scanning Electron Microscope (SEM) and X-Ray Diffraction (XRD) techniques. The study gives an indication of synergy arising from the pozzolanic activity and filler effects of SF in HVFA-SCC mixes.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"7 1","pages":"61 - 74"},"PeriodicalIF":2.1,"publicationDate":"2022-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45527545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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