K. Dziedzic, M. Dąbrowski, A. Antolik, A. Glinicki
The purpose of introducing air into the concrete mix is to increase the freeze-thaw and scaling resistance of hardened concrete. The utility of the sequential pressure method ( Super Air Meter - SAM) for assessment of the air entrainment quality was verified by comparing the results obtained with this method with the results of the air-void analysis of hardened concrete. The results of the tests carried out on mixes designed and produced at a laboratory and the mixes produced on an industrial scale during expressway construction are considered. Furthermore, the relationships between the SAM number and the micro air-void content A 300 in hardened concrete and the freeze-thaw and de-icing salt resistance are analysed as part of this research. A clear co-relation between the SAM number, a parameter that characterises the air-entrainment of the concrete mix, and the microvoid content has been demonstrated.
在混凝土配合比中引入空气的目的是增加硬化混凝土的抗冻融性和抗结垢性。通过将连续压力法(Super Air Meter - SAM)与硬化混凝土的空隙分析结果进行对比，验证了连续压力法(Super Air Meter - SAM)评价夹带空气质量的有效性。考虑了实验室设计和生产的混合料试验结果和高速公路建设中工业规模生产的混合料试验结果。此外，本文还分析了硬化混凝土中SAM数与微气孔含量a300及抗冻融除冰盐性能之间的关系。一个明确的相互关系之间的SAM数，一个参数，表征空气的混合混凝土的夹带，和微孔隙含量已被证明。
{"title":"Characteristics of concrete mix air-entrainment applying the sequential pressure method","authors":"K. Dziedzic, M. Dąbrowski, A. Antolik, A. Glinicki","doi":"10.7409/RABDIM.020.007","DOIUrl":"https://doi.org/10.7409/RABDIM.020.007","url":null,"abstract":"The purpose of introducing air into the concrete mix is to increase the freeze-thaw and scaling resistance of hardened concrete. The utility of the sequential pressure method ( Super Air Meter - SAM) for assessment of the air entrainment quality was verified by comparing the results obtained with this method with the results of the air-void analysis of hardened concrete. The results of the tests carried out on mixes designed and produced at a laboratory and the mixes produced on an industrial scale during expressway construction are considered. Furthermore, the relationships between the SAM number and the micro air-void content A 300 in hardened concrete and the freeze-thaw and de-icing salt resistance are analysed as part of this research. A clear co-relation between the SAM number, a parameter that characterises the air-entrainment of the concrete mix, and the microvoid content has been demonstrated.","PeriodicalId":44000,"journal":{"name":"Roads and Bridges-Drogi i Mosty","volume":"15 1","pages":"107-118"},"PeriodicalIF":0.5,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81723670","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}
The paper presents a method of comparing the geometrical condition of railway tracks at different times, in different places and with interdependent phenomena. This method involves treating the most important railway track properties as independent diagnostic variables and expressing each of them on a centile scale assumed as the basis for comparisons. The dependent variable is the geometric interval. In this way, it is possible to significantly enrich the description of the railway track condition on sections of railway lines on which changes in their state require a more detailed analysis, especially in terms of repair planning. Such sections are tracks on long bridges and sections on which new solution are tested. Selected track characteristic are obtained using diagnostics known in operation practice. The application of the method should facilitate planning of railway track repairs on bridges and comparison of results of experiments carried out on different test sections.
{"title":"Multi-factor method of comparison of the geometrical condition of railway tracks on bridges and tests sections","authors":"H. Bałuch","doi":"10.7409/RABDIM.020.008","DOIUrl":"https://doi.org/10.7409/RABDIM.020.008","url":null,"abstract":"The paper presents a method of comparing the geometrical condition of railway tracks at different times, in different places and with interdependent phenomena. This method involves treating the most important railway track properties as independent diagnostic variables and expressing each of them on a centile scale assumed as the basis for comparisons. The dependent variable is the geometric interval. In this way, it is possible to significantly enrich the description of the railway track condition on sections of railway lines on which changes in their state require a more detailed analysis, especially in terms of repair planning. Such sections are tracks on long bridges and sections on which new solution are tested. Selected track characteristic are obtained using diagnostics known in operation practice. The application of the method should facilitate planning of railway track repairs on bridges and comparison of results of experiments carried out on different test sections.","PeriodicalId":44000,"journal":{"name":"Roads and Bridges-Drogi i Mosty","volume":"55 1","pages":"119-134"},"PeriodicalIF":0.5,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75935648","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}
The paper reports the results of the tests used to determine hydration kinetics, physical properties and microstructure of hydraulic road binders. Seven hydraulically bound mixes were produced by mixing Portland cement (CEM I 32.5R), hydrated lime, and cement by-pass dust (CBPD) in proportions established as per the experimental plan. Cement by-pass dust was found to have the greatest effect on the increased water demand, hydration heat and soundness of the binder paste. Minerals derived from the hydration of input components were identified in the composition of the binder phases. In CBPD rich binders sylvite and calcium chloro-aluminate hydrate were present. The test results show that when planning the use of normal setting hydraulic road binders containing CBPD in road construction, the water to binder ratio w/b must be taken into account to ensure proper consistency, soundness, and amount of hydration heat release.
本文报道了用于测定水化动力学、物理性能和微观结构的试验结果。通过将波特兰水泥(CEM I 32.5R)、水合石灰和水泥旁通粉尘(CBPD)按实验计划确定的比例混合，制备了7种水力结合的混合料。发现水泥旁通粉尘对增加的需水量、水化热和粘结膏体的稳定性影响最大。由输入组分水化产生的矿物在粘结剂相的组成中得到了鉴定。在富含CBPD的粘合剂中，存在钾盐和水合氯铝酸钙。试验结果表明，在规划道路施工中使用含CBPD的正常凝结型水力道路粘结剂时，必须考虑水胶比w/b，以保证适当的稠度、稳定性和水化放热量。
{"title":"Testing the cement, hydrated lime and cement by-pass dust mixtures hydration","authors":"Z. Owsiak, P. Czapik, J. Zapała-Sławeta","doi":"10.7409/RABDIM.020.009","DOIUrl":"https://doi.org/10.7409/RABDIM.020.009","url":null,"abstract":"The paper reports the results of the tests used to determine hydration kinetics, physical properties and microstructure of hydraulic road binders. Seven hydraulically bound mixes were produced by mixing Portland cement (CEM I 32.5R), hydrated lime, and cement by-pass dust (CBPD) in proportions established as per the experimental plan. Cement by-pass dust was found to have the greatest effect on the increased water demand, hydration heat and soundness of the binder paste. Minerals derived from the hydration of input components were identified in the composition of the binder phases. In CBPD rich binders sylvite and calcium chloro-aluminate hydrate were present. The test results show that when planning the use of normal setting hydraulic road binders containing CBPD in road construction, the water to binder ratio w/b must be taken into account to ensure proper consistency, soundness, and amount of hydration heat release.","PeriodicalId":44000,"journal":{"name":"Roads and Bridges-Drogi i Mosty","volume":"1 1","pages":"135-147"},"PeriodicalIF":0.5,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84086372","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}
The use of chloride-based de-icers belongs to the most common road winter maintenance measures applied to prevent dangerous driving conditions. Chloride-based de-icers are the most frequently used worldwide. The essential difficulty with de-icers is their detrimental effect on concrete, other components of the road infrastructure and on vehicles. The interaction of various individual chloride salts with concrete is described in the paper; the experimental programme was focused on evaluation of the most frequently applied chloride-based de-icers in terms of damage to the air-entrained concrete used for highway construction. Three individual salts – NaCl, CaCl 2 , MgCl 2 – and one blend (NaCl + CaCl 2 ) were used. Their effect on concrete was investigated in terms of surface scaling during freezing-thawing cycles, residual mechanical properties and final ingress of chloride ions. Calcium chloride exhibited the most detrimental effect on the studied concrete.
{"title":"Effect of various de-icers containing chloride ions on scaling resistance and chloride penetration depth of highway concrete","authors":"P. Reiterman, M. Keppert","doi":"10.7409/RABDIM.020.003","DOIUrl":"https://doi.org/10.7409/RABDIM.020.003","url":null,"abstract":"The use of chloride-based de-icers belongs to the most common road winter maintenance measures applied to prevent dangerous driving conditions. Chloride-based de-icers are the most frequently used worldwide. The essential difficulty with de-icers is their detrimental effect on concrete, other components of the road infrastructure and on vehicles. The interaction of various individual chloride salts with concrete is described in the paper; the experimental programme was focused on evaluation of the most frequently applied chloride-based de-icers in terms of damage to the air-entrained concrete used for highway construction. Three individual salts – NaCl, CaCl 2 , MgCl 2 – and one blend (NaCl + CaCl 2 ) were used. Their effect on concrete was investigated in terms of surface scaling during freezing-thawing cycles, residual mechanical properties and final ingress of chloride ions. Calcium chloride exhibited the most detrimental effect on the studied concrete.","PeriodicalId":44000,"journal":{"name":"Roads and Bridges-Drogi i Mosty","volume":"41 1","pages":"51-64"},"PeriodicalIF":0.5,"publicationDate":"2020-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77745782","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}
High Modulus Asphalt Concrete base course of a motorway under construction cracked severely during the first winter after paving. The new viscoelastic method of thermal stress calculation was used to gain a better understanding of the mechanism of thermal stresses and development of low-temperature cracking in asphalt layers. This paper presents pavement structure and materials, thermal cracks intensity assessment, field and laboratory testing and the outline of the new viscoelastic method. Thermal stresses in the HMAC base course were calculated at its surface and at the depth of 5 cm at the time when transverse cracking occurred. The calculated thermal stresses were compared with tensile strength of the material. Probability of low-temperature cracking was determined. The results presented in the paper confirmed that the new method of thermal stress calculation was a valuable tool for analysis of low-temperature cracking. Several uncertainties and unsolved issues related to low-temperature cracking, which were discovered during the analysis, were described.
{"title":"Application of the new viscoelastic method of thermal stress calculation to the analysis of low-temperature cracking of ashpalt layers","authors":"J. Judycki","doi":"10.7409/RABDIM.020.002","DOIUrl":"https://doi.org/10.7409/RABDIM.020.002","url":null,"abstract":"High Modulus Asphalt Concrete base course of a motorway under construction cracked severely during the first winter after paving. The new viscoelastic method of thermal stress calculation was used to gain a better understanding of the mechanism of thermal stresses and development of low-temperature cracking in asphalt layers. This paper presents pavement structure and materials, thermal cracks intensity assessment, field and laboratory testing and the outline of the new viscoelastic method. Thermal stresses in the HMAC base course were calculated at its surface and at the depth of 5 cm at the time when transverse cracking occurred. The calculated thermal stresses were compared with tensile strength of the material. Probability of low-temperature cracking was determined. The results presented in the paper confirmed that the new method of thermal stress calculation was a valuable tool for analysis of low-temperature cracking. Several uncertainties and unsolved issues related to low-temperature cracking, which were discovered during the analysis, were described.","PeriodicalId":44000,"journal":{"name":"Roads and Bridges-Drogi i Mosty","volume":"49 1","pages":"27-49"},"PeriodicalIF":0.5,"publicationDate":"2020-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83856636","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}
The technology of renewal of metal corrugated structures allows efficient and economical reconstruction of existing reinforced concrete structures by the method of encapsulation. However, such structures can be exposed to adverse temperature effects that in combination with traffic loadings could influence the operational reliability of the structures. This article deals with the method of evaluation of the stress-strain state of a three-layer cylindrical structure. The technique is based on the thermo-elasticity theory. The study is performed in two steps: determining the temperature field of a structure, and then calculating the temperature stresses and deformations. As a result of calculations, it was established that the level of temperature field and stresses in a three-layer structure caused by the maximum and minimum ambient temperatures can reach a significant level.
{"title":"Study of the temperature field and the thermo-elastic state of the multilayer soil-steel structure","authors":"V. Kovalchuk, Yuriy Hnativ, J. Luchko, M. Sysyn","doi":"10.7409/RABDIM.020.004","DOIUrl":"https://doi.org/10.7409/RABDIM.020.004","url":null,"abstract":"The technology of renewal of metal corrugated structures allows efficient and economical reconstruction of existing reinforced concrete structures by the method of encapsulation. However, such structures can be exposed to adverse temperature effects that in combination with traffic loadings could influence the operational reliability of the structures. This article deals with the method of evaluation of the stress-strain state of a three-layer cylindrical structure. The technique is based on the thermo-elasticity theory. The study is performed in two steps: determining the temperature field of a structure, and then calculating the temperature stresses and deformations. As a result of calculations, it was established that the level of temperature field and stresses in a three-layer structure caused by the maximum and minimum ambient temperatures can reach a significant level.","PeriodicalId":44000,"journal":{"name":"Roads and Bridges-Drogi i Mosty","volume":"43 1","pages":"65-78"},"PeriodicalIF":0.5,"publicationDate":"2020-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82866007","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}
The paper presents two models of traffic forecasting developed for two completed road construction projects in two cities of Poland: Lublin and Poznan. The predictions from both models were compared with the field data. In the first part the article presents the currently used model for computational determination of road projects’ viability, including indication of relationships between road traffic forecasts on the one hand and actual road operations and viability of road projects on the other. The second part presents results of various international studies on road projects in order to show the differences between the predicted and the actual traffic volumes, which is typical for most developed countries. Then, the article discusses the differences observed between the model outputs and the actual traffic and its structure in the analysed road projects. Finally, the authors put forward their conclusions regarding the inconsistencies between the traffic models (as well as the resulting traffic forecasts) and the actual transport performance.
{"title":"Differences between the traffic model and the actual road traffic and its structure","authors":"Agnieszka Łukasiewicz, M. Świtała","doi":"10.7409/RABDIM.020.005","DOIUrl":"https://doi.org/10.7409/RABDIM.020.005","url":null,"abstract":"The paper presents two models of traffic forecasting developed for two completed road construction projects in two cities of Poland: Lublin and Poznan. The predictions from both models were compared with the field data. In the first part the article presents the currently used model for computational determination of road projects’ viability, including indication of relationships between road traffic forecasts on the one hand and actual road operations and viability of road projects on the other. The second part presents results of various international studies on road projects in order to show the differences between the predicted and the actual traffic volumes, which is typical for most developed countries. Then, the article discusses the differences observed between the model outputs and the actual traffic and its structure in the analysed road projects. Finally, the authors put forward their conclusions regarding the inconsistencies between the traffic models (as well as the resulting traffic forecasts) and the actual transport performance.","PeriodicalId":44000,"journal":{"name":"Roads and Bridges-Drogi i Mosty","volume":"38 1","pages":"79-91"},"PeriodicalIF":0.5,"publicationDate":"2020-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80084388","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}
The article analyses the causes of the Morandi viaduct disaster in Genoa. This three-span viaduct was a part of the A10 motorway leading to Savona. The structure of the viaduct supports was unusual. A pylon to each of the frame support was added and cantilevers to each pylon by means of a pair of suspended cables. The construction of the cable used was also atypical. The concreted cable had a rectangular cross-section and was a steel and concrete composite element. The concrete in this element was compressed with steel tendons so that it could transfer the tensile forces generated by the traffic load. The durability of the concreted cable subjected to tension was low. The article provides information on the technical condition of the viaduct and the way of strengthening the cables in the early 1990s. At that time, the author of the article visited this structure. He had a different concept of reinforcement than the one that was implemented. In August 2018, the viaduct disaster occurred, as a result of which one of the structure supports collapsed, and in June 2019, during the demolition process, the other two supports were blown up. Since in Venezuela and Libya there are still two more bridges with a structure similar to that in Italy, the concept of reinforcing them, as proposed by the author of the article 25 years ago, may still be useful.
{"title":"Causes of the Morandi viaduct disaster in Genoa as a contribution to the design of pre-stressed structures","authors":"J. Rymsza","doi":"10.7409//RABDIM.020.001","DOIUrl":"https://doi.org/10.7409//RABDIM.020.001","url":null,"abstract":"The article analyses the causes of the Morandi viaduct disaster in Genoa. This three-span viaduct was a part of the A10 motorway leading to Savona. The structure of the viaduct supports was unusual. A pylon to each of the frame support was added and cantilevers to each pylon by means of a pair of suspended cables. The construction of the cable used was also atypical. The concreted cable had a rectangular cross-section and was a steel and concrete composite element. The concrete in this element was compressed with steel tendons so that it could transfer the tensile forces generated by the traffic load. The durability of the concreted cable subjected to tension was low. The article provides information on the technical condition of the viaduct and the way of strengthening the cables in the early 1990s. At that time, the author of the article visited this structure. He had a different concept of reinforcement than the one that was implemented. In August 2018, the viaduct disaster occurred, as a result of which one of the structure supports collapsed, and in June 2019, during the demolition process, the other two supports were blown up. Since in Venezuela and Libya there are still two more bridges with a structure similar to that in Italy, the concept of reinforcing them, as proposed by the author of the article 25 years ago, may still be useful.","PeriodicalId":44000,"journal":{"name":"Roads and Bridges-Drogi i Mosty","volume":"1 1","pages":"5-25"},"PeriodicalIF":0.5,"publicationDate":"2020-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83133116","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}
Sustainable and durable road pavement requires appropriate maintenance and repair strategies. National road authorities collect data describing pavement condition every several years and use specific life-cycle analysis methods to draw up priority plans for maintenance activities. The pavement performance models (PPMs) create a basis for the life-cycle and cost-benefit analysis as they help to evaluate pavement condition as well as to predict pavement deterioration. The objective of this research is analysing different PPMs of rut depth propagation and to compare predicted rut depth with measured during service of the road. Four PPMs were analysed during this research based on a traffic flow or construction age. The pavement performance prediction models were applied to predict the increment of rutting for eleven road sections based on their bearing capacity properties.
{"title":"Analysis of flexible pavement performance prediction models based on structural behaviour","authors":"Paulius Paplauskas, A. Vaitkus, R. Kleizienė","doi":"10.7409/RABDIM.019.017","DOIUrl":"https://doi.org/10.7409/RABDIM.019.017","url":null,"abstract":"Sustainable and durable road pavement requires appropriate maintenance and repair strategies. National road authorities collect data describing pavement condition every several years and use specific life-cycle analysis methods to draw up priority plans for maintenance activities. The pavement performance models (PPMs) create a basis for the life-cycle and cost-benefit analysis as they help to evaluate pavement condition as well as to predict pavement deterioration. The objective of this research is analysing different PPMs of rut depth propagation and to compare predicted rut depth with measured during service of the road. Four PPMs were analysed during this research based on a traffic flow or construction age. The pavement performance prediction models were applied to predict the increment of rutting for eleven road sections based on their bearing capacity properties.","PeriodicalId":44000,"journal":{"name":"Roads and Bridges-Drogi i Mosty","volume":"65 1","pages":"255-265"},"PeriodicalIF":0.5,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84498675","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}
In aggressive environments structural steel components of engineering structures may become affected by corrosion. Even with corrosion protection, their critical load capacity and stability are seriously affected by the consequences of corrosion in aggressive environments due to impurities and possible failures. In this paper a critical state analysis of corroded struts is presented. The input data for the analysis was taken from laboratory corrosion tests in which steel pipes of a few different diameters were subjected to the attack of sulphuric and hydrochloric acids and placed in salt spray tester. The loss of material due to corrosion was determined and graphs, presenting the loss of material as a function of pipe diameter and the corrosion rate over time, were determined. The relative decrease of the maximum elastic strain energy which can be stored in the strut and the relative decrease of the critical load of elastic buckling were calculated for a series of corroded pipes. The curves of the relative change of the maximum elastic strain energy and the relative change of critical load over the time of corrosion progression were found to follow a similar path. For determining the critical load for a given strut, boundary conditions are taken into consideration. However, it is not necessary in the case of maximum elastic strain energy, which makes it a more convenient stability measure of the critical load capacity of strut.
{"title":"The assessment of stability at compression of steel pipes considering effects of uniform corrosion","authors":"A. Glinicka, S. Imiełowski","doi":"10.7409/RABDIM.019.018","DOIUrl":"https://doi.org/10.7409/RABDIM.019.018","url":null,"abstract":"In aggressive environments structural steel components of engineering structures may become affected by corrosion. Even with corrosion protection, their critical load capacity and stability are seriously affected by the consequences of corrosion in aggressive environments due to impurities and possible failures. In this paper a critical state analysis of corroded struts is presented. The input data for the analysis was taken from laboratory corrosion tests in which steel pipes of a few different diameters were subjected to the attack of sulphuric and hydrochloric acids and placed in salt spray tester. The loss of material due to corrosion was determined and graphs, presenting the loss of material as a function of pipe diameter and the corrosion rate over time, were determined. The relative decrease of the maximum elastic strain energy which can be stored in the strut and the relative decrease of the critical load of elastic buckling were calculated for a series of corroded pipes. The curves of the relative change of the maximum elastic strain energy and the relative change of critical load over the time of corrosion progression were found to follow a similar path. For determining the critical load for a given strut, boundary conditions are taken into consideration. However, it is not necessary in the case of maximum elastic strain energy, which makes it a more convenient stability measure of the critical load capacity of strut.","PeriodicalId":44000,"journal":{"name":"Roads and Bridges-Drogi i Mosty","volume":"1 1","pages":"267-281"},"PeriodicalIF":0.5,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74478096","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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