Pub Date : 2021-04-16DOI: 10.1080/14488353.2021.1899601
B. Jena, R. Patra, Bibhuti Bhusan Mukharjee
ABSTRACT The present experimental study tries to examine the impact of ferrochrome slag usage as a substitution of coarse aggregates and jute fibre (JF) on different characteristics of concrete. For this, 12 numbers of concrete mixes have been fabricated by introducing 0%, 50% and 100% ferrochrome slag aggregates (FSA) in place of natural coarse aggregates (NCA) and adding 0%, 0.1%, 0.2% and 0.3% JF in concrete. The workability, 7, 28, and 90 days compressive strength (CS), flexural strength (FS), split tensile strength (STS), ultrasonic pulse velocity (UPV), rebound number (RN), water absorption (WA), volume of voids (VV), density of designated mixes, have been studied to access the effect of incorporation of FSA and JF in concrete. The experimental outcome analysis depicts the concrete mix having 50%–100% FSA and 0.1% JF has strength, physical and non-destructive parameters similar to those of normal concrete. Furthermore, 50%–100% FSA usage has been recommended as a substitution of coarse aggregates because the incorporation of FSA has no substantial impact on various concrete properties. It is also detected that 0.1% JF could be introduced in concrete without significant degradation of concrete behaviour since, beyond this level, the properties of concrete are adversely affected.
{"title":"INFLUENCE OF INCORPORATION OF JUTE FIBRE AND FERROCHROME SLAG ON PROPERTIES OF CONCRETE","authors":"B. Jena, R. Patra, Bibhuti Bhusan Mukharjee","doi":"10.1080/14488353.2021.1899601","DOIUrl":"https://doi.org/10.1080/14488353.2021.1899601","url":null,"abstract":"ABSTRACT The present experimental study tries to examine the impact of ferrochrome slag usage as a substitution of coarse aggregates and jute fibre (JF) on different characteristics of concrete. For this, 12 numbers of concrete mixes have been fabricated by introducing 0%, 50% and 100% ferrochrome slag aggregates (FSA) in place of natural coarse aggregates (NCA) and adding 0%, 0.1%, 0.2% and 0.3% JF in concrete. The workability, 7, 28, and 90 days compressive strength (CS), flexural strength (FS), split tensile strength (STS), ultrasonic pulse velocity (UPV), rebound number (RN), water absorption (WA), volume of voids (VV), density of designated mixes, have been studied to access the effect of incorporation of FSA and JF in concrete. The experimental outcome analysis depicts the concrete mix having 50%–100% FSA and 0.1% JF has strength, physical and non-destructive parameters similar to those of normal concrete. Furthermore, 50%–100% FSA usage has been recommended as a substitution of coarse aggregates because the incorporation of FSA has no substantial impact on various concrete properties. It is also detected that 0.1% JF could be introduced in concrete without significant degradation of concrete behaviour since, beyond this level, the properties of concrete are adversely affected.","PeriodicalId":44354,"journal":{"name":"Australian Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/14488353.2021.1899601","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45466145","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 : 2021-04-02DOI: 10.1080/14488353.2021.1906831
Nima Mehrabi, H. Khabbaz
ABSTRACT The high-speed railway projects have encountered several geotechnical challenges. One of the most important challenges is the differential settlement control in transition zones. Cement-treated soil is a common method to prevent the differential settlement at transition zones. An alternative method uses stone columns for controlling the differential settlement in approaching embankment of bridges. In this study, numerical modelling using PLAXIS 2D is selected for the assessment of stone columns in the reduction of total and differential settlements. One of the overpass bridges of the track constructed for the Tehran–Isfahan railway, the first high-speed railway in the country, is chosen as the case study. Three models are created based on the properties of the selected case study. The first one is a typical approaching embankment. The second one is the bridge abutment section, and the last one is a typical reinforced approaching embankment with stone columns.
{"title":"A trustful transition zone for high-speed rail using stone columns","authors":"Nima Mehrabi, H. Khabbaz","doi":"10.1080/14488353.2021.1906831","DOIUrl":"https://doi.org/10.1080/14488353.2021.1906831","url":null,"abstract":"ABSTRACT The high-speed railway projects have encountered several geotechnical challenges. One of the most important challenges is the differential settlement control in transition zones. Cement-treated soil is a common method to prevent the differential settlement at transition zones. An alternative method uses stone columns for controlling the differential settlement in approaching embankment of bridges. In this study, numerical modelling using PLAXIS 2D is selected for the assessment of stone columns in the reduction of total and differential settlements. One of the overpass bridges of the track constructed for the Tehran–Isfahan railway, the first high-speed railway in the country, is chosen as the case study. Three models are created based on the properties of the selected case study. The first one is a typical approaching embankment. The second one is the bridge abutment section, and the last one is a typical reinforced approaching embankment with stone columns.","PeriodicalId":44354,"journal":{"name":"Australian Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/14488353.2021.1906831","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46964207","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 : 2021-03-28DOI: 10.1080/14488353.2021.1905250
D. Nguyen, V. P. Le
ABSTRACT The investigation of fly ash content for stabilized subbase materials in road pavements was presented in this study. The effects of partial replacement of cement by 17%, 33%, 50% of fly ash contents by total weight of mixture were investigated to evaluate mechanical properties of stabilized subbase materials using the unconfined compressive strength (UCS) test, indirect tensile (IDT) test, and resilient modulus test. It was found that the replacement of cement by 33% of fly ash can use for stabilized subbase material. In addition, a strong relationship between IDT and UCS strength, and resilient modulus and UCS is given which is the coefficient of determination of developed correlation to be 0.9 and 0.82, respectively. It was suggested that the IDT strength or the resilient modulus can be estimated from a UCS test. Finally, the performance of cement replacement with fly ash was evaluated using mechanistic empirical pavement design guide (MEPDG) program. Based on the results of the study, it can be concluded that the cement replacement with 33% fly ash can enhance the performance life significantly and the construction cost reduction can be around 23%, compared to using conventional subbase material.
{"title":"Determining optimum fly ash content for Stabilized subbase materials in road pavements","authors":"D. Nguyen, V. P. Le","doi":"10.1080/14488353.2021.1905250","DOIUrl":"https://doi.org/10.1080/14488353.2021.1905250","url":null,"abstract":"ABSTRACT The investigation of fly ash content for stabilized subbase materials in road pavements was presented in this study. The effects of partial replacement of cement by 17%, 33%, 50% of fly ash contents by total weight of mixture were investigated to evaluate mechanical properties of stabilized subbase materials using the unconfined compressive strength (UCS) test, indirect tensile (IDT) test, and resilient modulus test. It was found that the replacement of cement by 33% of fly ash can use for stabilized subbase material. In addition, a strong relationship between IDT and UCS strength, and resilient modulus and UCS is given which is the coefficient of determination of developed correlation to be 0.9 and 0.82, respectively. It was suggested that the IDT strength or the resilient modulus can be estimated from a UCS test. Finally, the performance of cement replacement with fly ash was evaluated using mechanistic empirical pavement design guide (MEPDG) program. Based on the results of the study, it can be concluded that the cement replacement with 33% fly ash can enhance the performance life significantly and the construction cost reduction can be around 23%, compared to using conventional subbase material.","PeriodicalId":44354,"journal":{"name":"Australian Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/14488353.2021.1905250","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45351463","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 : 2021-03-27DOI: 10.1080/14488353.2021.1904596
Md. Yeasin Ahmed, R. Evans
ABSTRACT This paper presents statistical evidence of roadside vegetation’s contribution to pavement roughness progression rates. Detailed statistical and regression analysis of the roadside vegetation data collected via satellite imageries and road roughness data collected via high speed road profiler was performed. Elaborative investigation on interaction between roadside vegetation and waveband roughness progression has provided a clear indication of tree variable’s contribution on road deterioration. Statistical parameters such as moderate Pearson correlation coefficient (r) values, low mean squared error (MSE), root mean squared error (RMSE), mean absolute error (MAE) values, high Willmott’s index of agreement (d) were obtained for training and validation datasets, that depicted the potentiality of tree variables as predictors in pavement roughness progression rate modelling. Statistical evidence showed that effect of trees on road deterioration was more noticeable on long wavelength roughness progression rates. This can be justified via prevailing soil moisture interaction in expansive soil deposits subjected to moisture withdrawal of deciduous trees in arid climate conditions. Overall, the findings of this paper exemplify on the necessity of considering the presence of roadside vegetation in road deterioration analysis, and suggesting the scope of improvement for prediction performance.
{"title":"Potentiality of tree variables as predictors in pavement roughness progression rate modelling","authors":"Md. Yeasin Ahmed, R. Evans","doi":"10.1080/14488353.2021.1904596","DOIUrl":"https://doi.org/10.1080/14488353.2021.1904596","url":null,"abstract":"ABSTRACT This paper presents statistical evidence of roadside vegetation’s contribution to pavement roughness progression rates. Detailed statistical and regression analysis of the roadside vegetation data collected via satellite imageries and road roughness data collected via high speed road profiler was performed. Elaborative investigation on interaction between roadside vegetation and waveband roughness progression has provided a clear indication of tree variable’s contribution on road deterioration. Statistical parameters such as moderate Pearson correlation coefficient (r) values, low mean squared error (MSE), root mean squared error (RMSE), mean absolute error (MAE) values, high Willmott’s index of agreement (d) were obtained for training and validation datasets, that depicted the potentiality of tree variables as predictors in pavement roughness progression rate modelling. Statistical evidence showed that effect of trees on road deterioration was more noticeable on long wavelength roughness progression rates. This can be justified via prevailing soil moisture interaction in expansive soil deposits subjected to moisture withdrawal of deciduous trees in arid climate conditions. Overall, the findings of this paper exemplify on the necessity of considering the presence of roadside vegetation in road deterioration analysis, and suggesting the scope of improvement for prediction performance.","PeriodicalId":44354,"journal":{"name":"Australian Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/14488353.2021.1904596","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46966600","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 : 2021-03-24DOI: 10.1080/14488353.2021.1899599
M. Taghizadeh, G. Asadollahfardi, A. Salehi, J. Akbardoost
ABSTRACT Water scarcity is the world’s challenging issue, and every day huge amounts of wash water(W) are produced by the concrete batching plants and concrete mixer trucks. Therefore, wash water reuse can be a method of saving water. This experimental work was conducted to determine the feasibility of using wash water in normal concrete and fibre(F) reinforced concrete. Workability and compressive, tensile, and flexural strengths, as well as fracture toughness of concrete specimens, were carried out according to ASTM and BS. The slump test results showed a slight decrease while using wash water or steel fibre and using both of them concurrently. Using wash water instead of tap water increased compressive strength at 7,14 and 28 days. Adding steel fibre in the specimens containing tap water raised compressive strength sharply at all periods. Nevertheless, applying wash water and steel fibre instantaneously in the concrete sample decreased compressive strength. This consequence was confirmed by the SEM image. Both tensile and flexural strength increased while using wash water instead of tap water. The maximum tensile strength was observed when 100% wash water and steel fibre (W + F) were replaced by tap water. Using steel fibre for concrete samples using tap water increased flexural strength by around 14% compared to the control sample. The highest flexural strength was reached while 100% wash water and steel fibre (W + F) were used simultaneously. Substituting wash water with tap water increased fracture toughness, and adding steel fibre to the concrete sample applying tap water similarly raised fracture toughness compared to the control sample. While using wash water and steel fibre in the concrete sample instantaneously, the fracture toughness increased by 49%.
{"title":"Feasibility Study of Reusing Wash Water and Steel Fibre Simultaneously on Workability, Mechanical Properties and Fracture Toughness of Concrete","authors":"M. Taghizadeh, G. Asadollahfardi, A. Salehi, J. Akbardoost","doi":"10.1080/14488353.2021.1899599","DOIUrl":"https://doi.org/10.1080/14488353.2021.1899599","url":null,"abstract":"ABSTRACT Water scarcity is the world’s challenging issue, and every day huge amounts of wash water(W) are produced by the concrete batching plants and concrete mixer trucks. Therefore, wash water reuse can be a method of saving water. This experimental work was conducted to determine the feasibility of using wash water in normal concrete and fibre(F) reinforced concrete. Workability and compressive, tensile, and flexural strengths, as well as fracture toughness of concrete specimens, were carried out according to ASTM and BS. The slump test results showed a slight decrease while using wash water or steel fibre and using both of them concurrently. Using wash water instead of tap water increased compressive strength at 7,14 and 28 days. Adding steel fibre in the specimens containing tap water raised compressive strength sharply at all periods. Nevertheless, applying wash water and steel fibre instantaneously in the concrete sample decreased compressive strength. This consequence was confirmed by the SEM image. Both tensile and flexural strength increased while using wash water instead of tap water. The maximum tensile strength was observed when 100% wash water and steel fibre (W + F) were replaced by tap water. Using steel fibre for concrete samples using tap water increased flexural strength by around 14% compared to the control sample. The highest flexural strength was reached while 100% wash water and steel fibre (W + F) were used simultaneously. Substituting wash water with tap water increased fracture toughness, and adding steel fibre to the concrete sample applying tap water similarly raised fracture toughness compared to the control sample. While using wash water and steel fibre in the concrete sample instantaneously, the fracture toughness increased by 49%.","PeriodicalId":44354,"journal":{"name":"Australian Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/14488353.2021.1899599","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48030731","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 : 2021-03-04DOI: 10.1080/14488353.2021.1896125
L. Gupta, Rakesh Kumar
ABSTRACT Cement Grouted Bituminous mix (CGBM) mix is a semi-flexible pavement type that essentially is an open-graded bituminous mix grouted with cement mortar comprising the advantages of both flexible and rigid pavements. CGBM is not popular and widely adopted in India so far may be due to a lack of available performance studies imparting knowledge. Therefore, an attempt has been made in this study to prepare grouting material and develop the mix design consideration first. Further, CGBM characteristics as an alternative recarpeting and/or wearing course material in the Indian scenario based on laboratory and field evaluation in comparison with bituminous concrete mix that is conventional wearing course is explored. In this regard, a trial stretch of CGBM is constructed in the urban area, and field performance is ensured with the laboratory results. Test results reveal that the CGBM mix possesses higher Marshall stability, compressive strength, tensile strength, resilient modulus, better resistance against the moisture damage and oil spillage condition, and less temperature susceptible than the conventional bituminous concrete mix. This case study of CGBM overlay is substantially increasing the remaining service life of the pavement in terms of fatigue and rutting life.
{"title":"Recarpeting using cement grouted bituminous mix in urban flexible pavement: a laboratory and field evaluation","authors":"L. Gupta, Rakesh Kumar","doi":"10.1080/14488353.2021.1896125","DOIUrl":"https://doi.org/10.1080/14488353.2021.1896125","url":null,"abstract":"ABSTRACT Cement Grouted Bituminous mix (CGBM) mix is a semi-flexible pavement type that essentially is an open-graded bituminous mix grouted with cement mortar comprising the advantages of both flexible and rigid pavements. CGBM is not popular and widely adopted in India so far may be due to a lack of available performance studies imparting knowledge. Therefore, an attempt has been made in this study to prepare grouting material and develop the mix design consideration first. Further, CGBM characteristics as an alternative recarpeting and/or wearing course material in the Indian scenario based on laboratory and field evaluation in comparison with bituminous concrete mix that is conventional wearing course is explored. In this regard, a trial stretch of CGBM is constructed in the urban area, and field performance is ensured with the laboratory results. Test results reveal that the CGBM mix possesses higher Marshall stability, compressive strength, tensile strength, resilient modulus, better resistance against the moisture damage and oil spillage condition, and less temperature susceptible than the conventional bituminous concrete mix. This case study of CGBM overlay is substantially increasing the remaining service life of the pavement in terms of fatigue and rutting life.","PeriodicalId":44354,"journal":{"name":"Australian Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/14488353.2021.1896125","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49105374","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 : 2021-01-04DOI: 10.1080/14488353.2020.1857927
Abu Sayed Mohammad Akid, S. Shah, M. H. R. Sobuz, V. Tam, Sazzad Hossain Anik
ABSTRACT This study aims to investigate the combined influence of varying concentration of waste steel fibre and fly ash on rheological and mechanical performance of fibre-reinforced concrete (FRC). Cement was substituted partially by fly ash at concentration of 5%, 10% and 20% by weight basis and waste steel fibre was incorporated as 1.5% and 3% in volume basis of concrete. Rheological tests of concrete, including slump, density, compacting factor, K-slump, and Kelly ball penetration were evaluated for the fresh state. Mechanical performances of concrete, including compressive, splitting tensile and flexural strength were determined at 7 and 28 days. Test results exhibited that fly ash enhanced the workability of all rheological tests; however, waste steel fibre reduced the workability and increased the density of fresh concrete. Substantial enhancement in compressive, splitting tensile and flexural strength was found for fly ash and waste steel FRC mixes than the control one. The optimum results of mechanical performance were achieved for mixture with concentration of 10% fly ash and 3% waste steel fibre among all mixes. Adding waste steel fibre with fly ash in concrete provided more pronounced mechanical performance at higher fibre concentration along with the minimisation of disposal problems and environmental damages.
{"title":"Combined influence of waste steel fibre and fly ash on rheological and mechanical performance of fibre-reinforced concrete","authors":"Abu Sayed Mohammad Akid, S. Shah, M. H. R. Sobuz, V. Tam, Sazzad Hossain Anik","doi":"10.1080/14488353.2020.1857927","DOIUrl":"https://doi.org/10.1080/14488353.2020.1857927","url":null,"abstract":"ABSTRACT This study aims to investigate the combined influence of varying concentration of waste steel fibre and fly ash on rheological and mechanical performance of fibre-reinforced concrete (FRC). Cement was substituted partially by fly ash at concentration of 5%, 10% and 20% by weight basis and waste steel fibre was incorporated as 1.5% and 3% in volume basis of concrete. Rheological tests of concrete, including slump, density, compacting factor, K-slump, and Kelly ball penetration were evaluated for the fresh state. Mechanical performances of concrete, including compressive, splitting tensile and flexural strength were determined at 7 and 28 days. Test results exhibited that fly ash enhanced the workability of all rheological tests; however, waste steel fibre reduced the workability and increased the density of fresh concrete. Substantial enhancement in compressive, splitting tensile and flexural strength was found for fly ash and waste steel FRC mixes than the control one. The optimum results of mechanical performance were achieved for mixture with concentration of 10% fly ash and 3% waste steel fibre among all mixes. Adding waste steel fibre with fly ash in concrete provided more pronounced mechanical performance at higher fibre concentration along with the minimisation of disposal problems and environmental damages.","PeriodicalId":44354,"journal":{"name":"Australian Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/14488353.2020.1857927","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45509779","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 : 2021-01-02DOI: 10.1080/14488353.2020.1795566
Lucas Cenci Aragão, Eduarda Fontoura, Luiza Carbunk Godoi, M. Garcez, G. Colpo, S. da Dalt, A. B. Rohden, L. Brito
ABSTRACT This paper investigates the potential application of a metallic waste addition obtained from the cutlery industry to improve the electrical conductivity and allow crack healing of asphalt concrete mixtures through electromagnetic induction heating. The effects of three different metallic waste content on the physical and mechanical properties of asphalt concrete mixtures have investigated. The crack healing potential by electromagnetic induction heating has been assessed in fully and partially cracked asphalt concrete specimens to simulate preventive and corrective maintenance. The crack healing potential has been evaluated through the results of load versus displacement curves obtained through SCB tests, based on a fracture-based approach by the ratio of fracture strength recovery after electromagnetic induction heating. Potential benefits such as simple mixing process and the possibility of using habitual design methods with satisfactory physical and mechanical properties can be achieved by using 10% of metallic waste by volume of bitumen added to asphalt concrete mixtures. The addition of metallic waste modified the fracture behaviour of the asphalt concrete mixtures, which indicates that after crack healing, samples may present a loss of ability to resist crack propagation. Healing indexes of 0.77 and 0.83 obtained for fully and partially cracked specimens produced with 10% of metallic waste by volume of bitumen.
{"title":"Extending the service life of asphalt concrete pavements through the addition of conductive metallic waste particles for induced crack healing","authors":"Lucas Cenci Aragão, Eduarda Fontoura, Luiza Carbunk Godoi, M. Garcez, G. Colpo, S. da Dalt, A. B. Rohden, L. Brito","doi":"10.1080/14488353.2020.1795566","DOIUrl":"https://doi.org/10.1080/14488353.2020.1795566","url":null,"abstract":"ABSTRACT This paper investigates the potential application of a metallic waste addition obtained from the cutlery industry to improve the electrical conductivity and allow crack healing of asphalt concrete mixtures through electromagnetic induction heating. The effects of three different metallic waste content on the physical and mechanical properties of asphalt concrete mixtures have investigated. The crack healing potential by electromagnetic induction heating has been assessed in fully and partially cracked asphalt concrete specimens to simulate preventive and corrective maintenance. The crack healing potential has been evaluated through the results of load versus displacement curves obtained through SCB tests, based on a fracture-based approach by the ratio of fracture strength recovery after electromagnetic induction heating. Potential benefits such as simple mixing process and the possibility of using habitual design methods with satisfactory physical and mechanical properties can be achieved by using 10% of metallic waste by volume of bitumen added to asphalt concrete mixtures. The addition of metallic waste modified the fracture behaviour of the asphalt concrete mixtures, which indicates that after crack healing, samples may present a loss of ability to resist crack propagation. Healing indexes of 0.77 and 0.83 obtained for fully and partially cracked specimens produced with 10% of metallic waste by volume of bitumen.","PeriodicalId":44354,"journal":{"name":"Australian Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/14488353.2020.1795566","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42737802","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 : 2020-12-18DOI: 10.1080/14488353.2020.1854941
Ali Parvari, S. M. Zahrai, S. M. Mirhosseini, E. Zeighami
ABSTRACT Beam-to-column connection is one of the main parts of steel structures that its failure induces local and/or overall structural failure. This paper aims at examining the impact of different rigid connections (including conventional, reduced beam section (RBS), drilled flange connection (DFC), those stiffened with exchangeable box components and variable-diameter DFC with concrete-filled box columns on the flexural behavior of a steel moment frames. A rhombic connection with a cutting vector pattern like RBS is designed and proposed; then its behavior is compared to those of RBS and DFC connections. The connections are modeled in Abaqus software and then their moment-rotation diagrams are plotted and compared. The results reveal that the DFC connection with holes of different diameters has proper energy absorption and performance. In conclusion, the rhombus DFC connection has a more reliable performance than other DFC connections. In this research, by placing the proposed stiffening components in the connection, it is observed that these components act as dampers increasing the bearing capacity and improve the connection behavior by absorbing the imposed energy. The results indicate that the proposed connection prevents from beam failure as most of input energy is absorbed by the proposed components.
{"title":"Comparing cyclic behaviour of RBS, DFC and proposed rigid connections in a steel moment frame with CFT column","authors":"Ali Parvari, S. M. Zahrai, S. M. Mirhosseini, E. Zeighami","doi":"10.1080/14488353.2020.1854941","DOIUrl":"https://doi.org/10.1080/14488353.2020.1854941","url":null,"abstract":"ABSTRACT Beam-to-column connection is one of the main parts of steel structures that its failure induces local and/or overall structural failure. This paper aims at examining the impact of different rigid connections (including conventional, reduced beam section (RBS), drilled flange connection (DFC), those stiffened with exchangeable box components and variable-diameter DFC with concrete-filled box columns on the flexural behavior of a steel moment frames. A rhombic connection with a cutting vector pattern like RBS is designed and proposed; then its behavior is compared to those of RBS and DFC connections. The connections are modeled in Abaqus software and then their moment-rotation diagrams are plotted and compared. The results reveal that the DFC connection with holes of different diameters has proper energy absorption and performance. In conclusion, the rhombus DFC connection has a more reliable performance than other DFC connections. In this research, by placing the proposed stiffening components in the connection, it is observed that these components act as dampers increasing the bearing capacity and improve the connection behavior by absorbing the imposed energy. The results indicate that the proposed connection prevents from beam failure as most of input energy is absorbed by the proposed components.","PeriodicalId":44354,"journal":{"name":"Australian Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2020-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/14488353.2020.1854941","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45692882","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 : 2020-12-07DOI: 10.1080/14488353.2020.1854943
W. Zeiada, Mena I. Souliman, M. Arab, B. Underwood, Kmail Kaloush
ABSTRACT The study presented in this paper assesses and compares the laboratory fatigue performance of two gap-graded asphalt concrete (AC) mixture: one using crumb rubber (CR) (rubber-modified) and without using CR (conventional). The rubber-modified and conventional gap-graded mixtures were sampled from the E18 highway located in the Stockholm area of Sweden. The testing program consisted of dynamic modulus, |E*|, bending beam, and axial fatigue tests. The |E*| master curves of the respective AC mixtures and their generalised fatigue model coefficients (k 1, k 2, k 3) from the axial fatigue tests were used to predict and compare the long-term pavement performance of each mixture using the AASHTOWare Pavement ME Design software. This analysis was performed systematically using parametric variations to assess the sensitivity of the predicted performance to individual material factors. Fatigue test results from both bending beam and axial fatigue tests showed clear evidence of improved fatigue behaviour for the rubber-modified gap-graded mixture compared to the conventional gap-graded mixture. The Pavement ME design analysis showed that the rubber-modified gap-graded mixture outperformed the conventional mixture. The parametric sensitivity analysis showed that this improved behaviour was the result of an increase in k 1 and decrease in k 2 of the fatigue life relationships at individual test temperatures of the rubber-modified gap-graded mixture. It was also found that the |E*| and the fatigue coefficient k 3 of the rubber-modified gap-graded mixture has an adverse impact on its fatigue performance compared to that of the conventional gap-graded mixture.
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