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    Strength and Deformational Characteristics of Foamed Bitumen Mixes under Suboptimal Conditions

    Source: Journal of Transportation Engineering, Part A: Systems:;2011:;Volume ( 137 ):;issue: 001
    Author:
    Alvaro Gonzalez
    ,
    Misko Cubrinovski
    ,
    Bryan Pidwerbesky
    ,
    David Alabaster
    DOI: 10.1061/(ASCE)TE.1943-5436.0000185
    Publisher: American Society of Civil Engineers
    Abstract: The effects of foamed bitumen contents on the strength and deformational behavior of foamed bitumen mixes used for road pavements is very complex and not fully understood yet. While some writers report an increase in strength using one type of laboratory test, other writers report either only a small increase or even a decrease in strength using other types of tests, thus detracting foamed bitumen from being implemented as a cold-recycling technique for road pavement rehabilitation. This paper presents a laboratory study carried out on a specific granular material from New Zealand containing 1% cement and different foamed bitumen contents using indirect tensile strength (ITS), monotonic load triaxial (MLT), and repeat load triaxial (RLT) tests. The curing procedure, loading regime, and moisture contents were selected to simulate construction practice and suboptimal conditions normally found in New Zealand pavements. The results from these tests showed that an increase in foamed bitumen content up to an “optimum” content, increases the ITS but, at the same time, decreases both the permanent deformation resistance measured in RLT tests and the peak strength in MLT tests. In order to systematically examine the results from these tests, a general stress analysis was conducted, in which the stress paths applied in laboratory tests were plotted in
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      Strength and Deformational Characteristics of Foamed Bitumen Mixes under Suboptimal Conditions

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    http://yetl.yabesh.ir/yetl1/handle/yetl/69183
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    contributor authorAlvaro Gonzalez
    contributor authorMisko Cubrinovski
    contributor authorBryan Pidwerbesky
    contributor authorDavid Alabaster
    date accessioned2017-05-08T22:01:48Z
    date available2017-05-08T22:01:48Z
    date copyrightJanuary 2011
    date issued2011
    identifier other%28asce%29te%2E1943-5436%2E0000229.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/69183
    description abstractThe effects of foamed bitumen contents on the strength and deformational behavior of foamed bitumen mixes used for road pavements is very complex and not fully understood yet. While some writers report an increase in strength using one type of laboratory test, other writers report either only a small increase or even a decrease in strength using other types of tests, thus detracting foamed bitumen from being implemented as a cold-recycling technique for road pavement rehabilitation. This paper presents a laboratory study carried out on a specific granular material from New Zealand containing 1% cement and different foamed bitumen contents using indirect tensile strength (ITS), monotonic load triaxial (MLT), and repeat load triaxial (RLT) tests. The curing procedure, loading regime, and moisture contents were selected to simulate construction practice and suboptimal conditions normally found in New Zealand pavements. The results from these tests showed that an increase in foamed bitumen content up to an “optimum” content, increases the ITS but, at the same time, decreases both the permanent deformation resistance measured in RLT tests and the peak strength in MLT tests. In order to systematically examine the results from these tests, a general stress analysis was conducted, in which the stress paths applied in laboratory tests were plotted in
    publisherAmerican Society of Civil Engineers
    titleStrength and Deformational Characteristics of Foamed Bitumen Mixes under Suboptimal Conditions
    typeJournal Paper
    journal volume137
    journal issue1
    journal titleJournal of Transportation Engineering, Part A: Systems
    identifier doi10.1061/(ASCE)TE.1943-5436.0000185
    treeJournal of Transportation Engineering, Part A: Systems:;2011:;Volume ( 137 ):;issue: 001
    contenttypeFulltext
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