The research described in this paper concerns the fatigue life of base course asphalt mixtures. Two mixture types were chosen for analysis: asphalt concrete and High Modulus Asphalt Concrete. Either of them contained different bitumen types, including standard pen-grade bitumens, polymer-modified bitumens (PMB) and so-called highly-modified asphalts (HiMA). Fatigue life tests were carried out and their results were used for fatigue law determination of the mixtures under analysis. Fatigue life analyses were performed both for the analysed mixtures and for typical flexible pavements. The value of the so-called shift factor was estimated to enable application in the design of pavements of the fatigue law parameters determined in laboratory. Two fatigue parameters are proposed in this research: critical strain and fatigue life ratio. They provide a more robust comparison of fatigue life determinations on bituminous mixtures by taking into consideration also the fatigue life of the pavement structure itself. The analyses conducted as part of this research enabled assessment of the fatigue life of asphalt mixtures taking account of the type of both the mixture and the bitumen it contains.
{"title":"Analysis of fatigue life of asphalt concretes considering different types of mixtures and binders","authors":"W. Bańkowski","doi":"10.7409/RABDIM.018.016","DOIUrl":"https://doi.org/10.7409/RABDIM.018.016","url":null,"abstract":"The research described in this paper concerns the fatigue life of base course asphalt mixtures. Two mixture types were chosen for analysis: asphalt concrete and High Modulus Asphalt Concrete. Either of them contained different bitumen types, including standard pen-grade bitumens, polymer-modified bitumens (PMB) and so-called highly-modified asphalts (HiMA). Fatigue life tests were carried out and their results were used for fatigue law determination of the mixtures under analysis. Fatigue life analyses were performed both for the analysed mixtures and for typical flexible pavements. The value of the so-called shift factor was estimated to enable application in the design of pavements of the fatigue law parameters determined in laboratory. Two fatigue parameters are proposed in this research: critical strain and fatigue life ratio. They provide a more robust comparison of fatigue life determinations on bituminous mixtures by taking into consideration also the fatigue life of the pavement structure itself. The analyses conducted as part of this research enabled assessment of the fatigue life of asphalt mixtures taking account of the type of both the mixture and the bitumen it contains.","PeriodicalId":44000,"journal":{"name":"Roads and Bridges-Drogi i Mosty","volume":"81 1","pages":"253-270"},"PeriodicalIF":0.5,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82855890","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 selected information on the quality of the aggregates, especially natural sands, extracted and manufactured in Poland. The sands usually meet the basic quality requirements (e.g. concerning grading and purity) for fine aggregates to be used in road construction. Tests of the alkali reactivity of natural sands and manufactured (by crushing compact rock) sands are described in detail. The results of the reactivity tests carried out in accordance with domestic standards PN-B-06714 show the tests to be poorly reliable. Exemplary abridged petrographic descriptions of selected sands and the results of reactivity tests carried out on mortar beams in accordance with standard ASTM C1260 are presented. The beam linear expansion values were geographically assigned by marking them on a contour map of Poland. The tested fine aggregates were found to greatly vary qualitatively as regards their mineral composition and the likelihood of occurrence of the alkali-aggregate reaction. Over half of the tested sands were characterized by an expansion over 0.1%, which according to the AASHTO R-80 classification means that they are moderately reactive aggregates.
{"title":"Alkali-silica reactivity of selected domestic fine aggregates","authors":"Z. Naziemiec","doi":"10.7409/RABDIM.018.017","DOIUrl":"https://doi.org/10.7409/RABDIM.018.017","url":null,"abstract":"The paper presents selected information on the quality of the aggregates, especially natural sands, extracted and manufactured in Poland. The sands usually meet the basic quality requirements (e.g. concerning grading and purity) for fine aggregates to be used in road construction. Tests of the alkali reactivity of natural sands and manufactured (by crushing compact rock) sands are described in detail. The results of the reactivity tests carried out in accordance with domestic standards PN-B-06714 show the tests to be poorly reliable. Exemplary abridged petrographic descriptions of selected sands and the results of reactivity tests carried out on mortar beams in accordance with standard ASTM C1260 are presented. The beam linear expansion values were geographically assigned by marking them on a contour map of Poland. The tested fine aggregates were found to greatly vary qualitatively as regards their mineral composition and the likelihood of occurrence of the alkali-aggregate reaction. Over half of the tested sands were characterized by an expansion over 0.1%, which according to the AASHTO R-80 classification means that they are moderately reactive aggregates.","PeriodicalId":44000,"journal":{"name":"Roads and Bridges-Drogi i Mosty","volume":"22 1","pages":"271-283"},"PeriodicalIF":0.5,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83252301","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 : 2018-12-31DOI: 10.7591/9780801456466-006
P. Harvey, H. Knox
{"title":"Chapter 2. Integration and Difference","authors":"P. Harvey, H. Knox","doi":"10.7591/9780801456466-006","DOIUrl":"https://doi.org/10.7591/9780801456466-006","url":null,"abstract":"","PeriodicalId":44000,"journal":{"name":"Roads and Bridges-Drogi i Mosty","volume":"28 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83455557","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 : 2018-12-31DOI: 10.7591/9780801456466-fm
{"title":"Frontmatter","authors":"","doi":"10.7591/9780801456466-fm","DOIUrl":"https://doi.org/10.7591/9780801456466-fm","url":null,"abstract":"","PeriodicalId":44000,"journal":{"name":"Roads and Bridges-Drogi i Mosty","volume":"40 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73696463","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 : 2018-12-31DOI: 10.7591/9780801456466-009
{"title":"Chapter 5. Corruption and Public Works","authors":"","doi":"10.7591/9780801456466-009","DOIUrl":"https://doi.org/10.7591/9780801456466-009","url":null,"abstract":"","PeriodicalId":44000,"journal":{"name":"Roads and Bridges-Drogi i Mosty","volume":"26 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76050704","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 : 2018-12-31DOI: 10.7591/9780801456466-002
{"title":"Abbreviations","authors":"","doi":"10.7591/9780801456466-002","DOIUrl":"https://doi.org/10.7591/9780801456466-002","url":null,"abstract":"","PeriodicalId":44000,"journal":{"name":"Roads and Bridges-Drogi i Mosty","volume":"105 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80779516","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 : 2018-12-31DOI: 10.7591/9780801456466-005
{"title":"Chapter 1. Historical Futures","authors":"","doi":"10.7591/9780801456466-005","DOIUrl":"https://doi.org/10.7591/9780801456466-005","url":null,"abstract":"","PeriodicalId":44000,"journal":{"name":"Roads and Bridges-Drogi i Mosty","volume":"5 4","pages":""},"PeriodicalIF":0.5,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72476331","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 : 2018-12-31DOI: 10.7591/9780801456466-004
{"title":"Introduction. Anthropology, Infrastructure, and Expertise","authors":"","doi":"10.7591/9780801456466-004","DOIUrl":"https://doi.org/10.7591/9780801456466-004","url":null,"abstract":"","PeriodicalId":44000,"journal":{"name":"Roads and Bridges-Drogi i Mosty","volume":"27 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73805084","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 first part of the paper provides a review of the state of knowledge of the dynamic behaviour of railway bridges under moving loads. Particular attention is paid to developments in modelling railway bridge loading and dynamic vehicle-span (structure) interaction. The most important aspects determining the advancements in this area of knowledge are identified. The contemporary techniques for defining bridge span finite element models used in dynamic analyses are also discussed. The second, practical part of the paper presents the results of numerical simulations of the passage of load along the bridge structure. The railway loads are represented by a series of concentrated forces and a series of single-mass oscillators. Vibration of the bridge span centre and the vehicle mass depending on the speed of travel are considered. The loading parameters are adopted to represent a real railway vehicle - EN57 electrical multiple unit. The structure’s parameters were adopted on the basis of a 30 m long load-relieving span. In both cases modal identification techniques were used to obtain all the required dynamic parameters of the span under analysis on the basis of experimental data.
{"title":"Dynamic analysis of the railway bridge span under moving loads","authors":"M. Szafrański","doi":"10.7409/RABDIM.018.019","DOIUrl":"https://doi.org/10.7409/RABDIM.018.019","url":null,"abstract":"The first part of the paper provides a review of the state of knowledge of the dynamic behaviour of railway bridges under moving loads. Particular attention is paid to developments in modelling railway bridge loading and dynamic vehicle-span (structure) interaction. The most important aspects determining the advancements in this area of knowledge are identified. The contemporary techniques for defining bridge span finite element models used in dynamic analyses are also discussed. The second, practical part of the paper presents the results of numerical simulations of the passage of load along the bridge structure. The railway loads are represented by a series of concentrated forces and a series of single-mass oscillators. Vibration of the bridge span centre and the vehicle mass depending on the speed of travel are considered. The loading parameters are adopted to represent a real railway vehicle - EN57 electrical multiple unit. The structure’s parameters were adopted on the basis of a 30 m long load-relieving span. In both cases modal identification techniques were used to obtain all the required dynamic parameters of the span under analysis on the basis of experimental data.","PeriodicalId":44000,"journal":{"name":"Roads and Bridges-Drogi i Mosty","volume":"28 1","pages":"299-316"},"PeriodicalIF":0.5,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73214904","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 : 2018-12-31DOI: 10.7591/9780801456466-014
{"title":"Index","authors":"","doi":"10.7591/9780801456466-014","DOIUrl":"https://doi.org/10.7591/9780801456466-014","url":null,"abstract":"","PeriodicalId":44000,"journal":{"name":"Roads and Bridges-Drogi i Mosty","volume":"65 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83460247","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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