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Characteristics of aggregate gradation, drain down and stabilizing agents in stone matrix asphalt mixtures: A state of art review

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Journal of Traffic and Transportation Engineering(English Edition) 2022年第2期9卷 167-179页

作者： lekhaz devulapalli Goutham Sarang Saravanan Kothandaraman The Bombay Textile Research Association Mumbai 400086India School of Civil Engineering Vellore Institute of TechnologyChennai 600127India

Over the years stone matrix asphalt(SMA)mixtures have evolved significantly and research works have presented some promising *** made the paving industries to increase the usage of SMA mixtures in the pavement ***,SMA mixtures have certain challenges or setbacks,which require comprehensive *** aim of the review paper is to present some of the challenges in SMA mixtures and their mitigations *** is observed that several challenges(i.e.,aggregate gradation,stone-onstone contact,drain down and stabilizing agents)related to SMA mixtures are addressed by the *** agencies have suggested their own aggregate gradation based on their experience,location,climatic conditions and available manufacturing facilities,and they are working ***-on-stone contact is achieved with proper aggregate gradation and failure to meet the same will reduce the *** down is major concern in the SMA mixtures since it controls overall mixture ***,researchers shown out the most importance to curtail the *** researchers followed ASTM D6390 and National Cooperative Highway Research Program(NCHRP No.424)procedure to evaluate the drain down and concluded that drain down should be less than0.3%(by weight of mixture).Apart from that,researchers are trying different stabilizing agents to reduce the drain ***,stabilizing agents such as fibers and polymers have a positive ***,suitable waste and recycle products are used as stabilizing agent to reduce drain down and environmental *** of which coconut fiber has shown some promising results,however,comprehensive research is required in this *** the other hand,0.3%of cellulose fiber is working as a good stabilizing agent and can be used without conducting drain down *** review paper provides a complete knowledge about different stabilizing agents used in SMA mixtures to minimize the drain down.

关键词： Stone matrix asphalt Drain down Stabilizing agents Stone-on-stone contact Aggregate gradation Nominal maximum aggregate size

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