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Suitability of various supplementary cementitious admixtures for RAP inclusive RCCP mixes
Published in Taylor and Francis Ltd.
2019
Abstract
Utilisation of reclaimed asphalt pavement (RAP) aggregates in concrete mixes generally results in strength reductions owing to asphalt-cohesion failure. Therefore, the present investigation is an effort to improve the RAP inclusive roller compacted concrete pavement (RCCP) properties by incorporating supplementary cementitious mineral admixtures (SCMs). Incorporation of 50% RAP aggregates lowered the strength and durability properties of the RCCP mix considerably. Inclusions of SCMs showed an almost negligible effect on the fresh properties; but had a prominent effect on the mechanical properties of 50RAP mix, thus, indicating their unsuitability for RAP–RCCP mixes if added in a sight to enhance its strength. However, almost all the mixes achieved the minimum stipulated flexural strength benchmark, and hence, could be recommended for RCCP mixes. Utilisation of silica-fume and bagasse-ash were further noted to improve the abrasion resistance of 50RAP mix. Likewise, the considered SCMs were also able to reduce the porosity and absorption related properties considerably and enhanced its durability in acidic environments of sulphate and chloride-rich ions. Based on the study, it is suggested to avoid the use of SCMs, if strength enhancement is the requisition, however, its utilisation is firmly suggested in order to enhance the durability performance of RAP-RCCP mixes. © 2019, © 2019 Informa UK Limited, trading as Taylor & Francis Group.
About the journal
JournalData powered by TypesetInternational Journal of Pavement Engineering
PublisherData powered by TypesetTaylor and Francis Ltd.
ISSN10298436
Open AccessNo
Concepts (17)
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    Aggregates
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    Asphalt
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    Chlorine compounds
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    CONCRETE AGGREGATES
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    CONCRETE MIXTURES
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    Durability
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    Silica fume
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    SULFUR COMPOUNDS
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    DURABILITY PERFORMANCE
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    Durability property
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    RCCP
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    Reclaimed asphalt pavements
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    ROLLER COMPACTED CONCRETE PAVEMENTS
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    SCMS
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    Strength
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    STRENGTH ENHANCEMENT
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    Concrete additives