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Mix design method of asphalt rubber open-graded friction course and its application in overlay

Journal of Southeast University(English Edition) 2009年第3期25卷 395-399页

作者：白琦峰钱振东曹荣吉东南大学交通学院南京210096 江苏省交通科学研究院南京211112

The mix design method of asphalt rubber open-graded friction course （AR-OGFC） by the Marshall test and key technologies of AR-OGFC overlay are studied. Based on the draindown test, the stripping test and the Marshall test by different beating times, the asphalt content estimating method and Marshall beat criterion are studied. It is found that the asphalt content of AR-OGFC can be estimated by the formula of Arizona, and the proper Marshall test criterion for AR-OGFC is 50 beats on both sides. By analyzing the influence of gradation on OGFC performance, the gradation of AR-OGFC is recommended, and the amount of aggregate passing 4. 75 mm should be minimized for AR-OGFC. Through investigation of AR-OGFC overlay projects, key technologies such as the treatment of underlying pavement and the selection of tack coat are advanced, and modified emulsified asphalt should be used in AR-OGFC overlay tack coat.

关键词： asphalt rubber open-graded friction course beat time of Marshall test tack coat

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A review of top-down cracking in asphalt pavements:Causes, models, experimental tools and future challenges

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Journal of Traffic and Transportation Engineering(English Edition) 2020年第5期7卷 541-572页

作者： Francesco Canestrari Lorenzo Paolo Ingrassia Dipartimento di Ingegneria Civile Edile e Architettura(DICEA)Uniuersita Politecnica delle MarcheAncona 60131Italy

In the last decades,a new type of distress has been observed more and more frequently on asphalt *** distress,ascribable to fatigue failure,has been named top-down cracking(TDC) because it consists in longitudinal cracks that initiate on the pavement surface and then propagate downwards.A series of surveys recently carried out on Italian motorways highlighted that TDC can affect up to 20%-30% of the slow traffic ***,in order to achieve a better understanding of such distress,this paper reviews causes,models and experimental tools and highlights future challenges for *** literature review indicates that TDC can evolve on the pavement surface in three stages(i.e.,single crack,sister cracks,alligator cracking) and,below a certain depth,the cracks can form angles of 20°-40° with respect to the vertical *** though multiple factors contribute to TDC development,thick pavements are more likely to fail due to TDC induced by tire-pavement contact stresses,especially in the presence of open-graded friction courses(OGFCs).Moreover,in literature there are several TDC models based on mechanics(e.g.,fracture mechanics or continuum damage mechanics) which allow a rigorous study of crack initiation and *** challenges include the identification of a reliable and feasible test method,among those proposed in literature,to study the TDC performance of asphalt mixtures and the implementation of TDC in pavement management systems(PMSs) through the definition of criteria for TDC recognition in the field as well as for the rehabilitation depth ***,more research is needed for open-graded asphalt mixtures,which present critical drawbacks in terms of TDC.

关键词： Top-down cracking Flexible pavements Fatigue Cracking model open-graded friction course Pavement management system

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