Experimental study on the effect of superplasticizer on workability and strength characteristics of recycled coarse aggregate concrete

Dash, Abhijeet Prasad; Sahoo, Kirtikanta; Panda, H. S.; Pradhan, Arpan; Jena, Biswajit

doi:10.1016/j.matpr.2022.01.324

Cited by 4 publications

(1 citation statement)

References 16 publications

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“…A significant number of studies focusing on the use of recycled aggregates could be found in the literature (Ahimoghadam et al, 2020;Arun;Chekravarty;Murali, 2021;Cominato et al, 2022;De Souza et al, 2022;Gupta;Chaudhary, 2022;Hassan;Faroun;Mohammed, 2021;Kumar et al, 2022;Liu et al, 2022;Moulya;Chandrashekhar, 2022;Prasad Dash et al, 2022;Rahul et al, 2022;Shi et al, 2016;Ye;Chen;Su, 2022;Zhou et al, 2021;Zhu et al, 2022). The market for powder fraction is still small, and it is usually discarded (Vázquez, 2013;Xiao et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Mixed construction and demolition powder as a filler to Portland cement: study on packaged pastes

Oliveira,

Proença,

Marques Filho

et al. 2024

Ambient. constr.

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The aim of this study is to explore more sustainable approaches by replacing Portland cement (OPC) with recycled mixed powder (RMP) derived from construction and demolition waste (CDW), with a focus on reducing carbon emissions. The CDW was subjected to grinding and sieving until a fraction <0.15 mm was obtained. The particles were then thermally activated at 800°C in a muffle for 0.5, 1, 2, and 3 hours. The OPC replacement levels by RMP were defined based on the particle packing method, ranging from 0 to 65%. The study was carried out on pastes with a water/fines ratio ranging from 0.07 to 0.14 and superplasticizer admixture (SP), evaluating the compressive strength at 28, 63, and 91 days. The mechanical and environmental performance of Portland cement pastes composed with RMP showed compressive strength higher than the reference, reaching 37 MPa for a 45% replacement content at 28 days, reducing the CO2 emissions per m³ of paste by up to 53%. This study suggested that the treatment and packaging RMP particles may potentially increase the mechanical and environmental performance, making it an alternative to promote the circular economy and low-carbon cement.

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