Repercussion of reclaimed concrete fine aggregates over hot mix asphalt design
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TECHNICAL PAPER
Repercussion of reclaimed concrete fine aggregates over hot mix asphalt design Bandana Jethy1 · Bibhuti Bhusan Mukharjee2 · Sudhanshu Sekhar Das3 Received: 1 June 2020 / Accepted: 23 August 2020 © Springer Nature Switzerland AG 2020
Abstract The paper assesses the effect of replacement of the fine portion of natural fine aggregates (NFA) with reclaimed fine aggregates (RFA) on hot mix asphalt (HMA) design parameters by using the full factorial design method. For this, the RFA percentage and bitumen content (BC) percentage are considered as the factors in the design of experiments. The HMA samples with varying percentages of RFA as a fractional replacement of NFA along with varying percentages of BC have been prepared. The test results are analyzed using analysis of variance (ANOVA), and the outcomes depict the significant influences of the factors chosen on the different HMA volumetric parameters and Marshall design parameters. Further, the study indicated that both the chosen factors and their interaction have a significant effect on the properties of HMA like bulk density, air void, void filled with bitumen, and void mineral aggregate value. In addition to above, the fatigue resistance and moisture susceptibility of HMA mixes rise up to a certain RFA% replacement which encourages the substitution of RFA up to certain percentage in HMA mixes for constructions of the flexible pavements. Keywords ANOVA · Hot mix asphalt · Reclaimed fine aggregates · Moisture susceptibility · Fatigue resistance
Introduction The use of demolition waste from the construction industry is the current trend worldwide concerning the issues associated with the sustainability and the environment. The usage of recycled aggregates in different new constructions has been extensively documented in the literature [2, 6–10]. Further, recycled aggregates have been widely utilized in the construction of pavements for reducing the cost and protecting the environment in current years [2–8, 18]. Hot mix asphalt (HMA) comprising of recycled aggregates exhibited * Sudhanshu Sekhar Das [email protected] Bandana Jethy [email protected] Bibhuti Bhusan Mukharjee [email protected] 1
Gandhi Institute for Technological Advancement, Bhubaneswar, Odisha, India
2
Department of Civil Engineering, CAPGS, BPUT, Rourkela, India
3
Veer Surendra Sai University of Technology, Burla, Odisha, India
higher resistance to permanent deformation as compared to the natural aggregate mixtures [25, 26]. The highly porous cement paste present in recycled concrete aggregates (RCA) is the major cause of higher water absorption and low density with high porosity [21, 22]. Hence, the RCA had a significant influence on the volumetric properties of HMA [22–24], showing higher air voids (Va) percentage than virgin aggregate mix due to the existence of attached cement mortar [28]. The flow value increased with an increasing amount of recycled aggregates [33] and affected the stability of mix substantially with the replacement of natural aggreg
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