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Studies on thermo-chemical treatment of recycled concrete fine aggregates for use in concrete

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Abstract

The presence of cement paste is the most important factor affecting the quality of recycled concrete fine aggregates. This study aims to develop the thermo-chemical treatment for the purpose of removal of the cement paste adhering to recycled concrete fine aggregates. This study involves assessing the effectiveness of thermo-chemical treatment and comparing its efficiency with thermal and chemical treatments. The results of the investigation elucidate the influence of these treatments on the performances of recycled concrete fine aggregates as well as influence of using treated and untreated recycled concrete fine aggregates on the characteristics of concrete. The results revealed that the thermo-chemical treatment experiences the satisfactory performances in improving the quality of recycled concrete fine aggregates and such treated recycled concrete fine aggregates used in concrete contribute to considerable improvement in strength characteristics.

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Abbreviations

RCA:

Recycled concrete aggregates

RCCA:

Recycled concrete coarse aggregates

RCFA:

Recycled concrete fine aggregates

AM:

Adhered mortar

CP:

Cement paste

HCl:

Hydrochloric acid

NFA:

Natural fine aggregates

NCA:

Natural coarse aggregates

SP:

Superplasticizer

ITZ:

Interfacial transition zone

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Acknowledgements

The paper is published with kind permission of the Director, CSIR-CBRI, Roorkee, and it forms a part of a Supra Institutional Project of CSIR R&D program (Govt. of India) under 12th 5-year plan. The authors are grateful to Prof. S.K. Bhattacharyya, Former Director, CSIR, Central Building Research Instititute, Roorkee, India, for constructive comments throughout the research work. Authors are also thankful to Ms. Monalisa Behera, Mr. Maiti S, and all our institute staffs for their help during research work.

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Authors and Affiliations

  1. Environmental Science and Technology Group, CSIR-Central Building Research Institute, Roorkee, 247 667, India

    G. Santha Kumar & A. K. Minocha

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  1. G. Santha Kumar
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  2. A. K. Minocha
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Correspondence to G. Santha Kumar.

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Santha Kumar, G., Minocha, A.K. Studies on thermo-chemical treatment of recycled concrete fine aggregates for use in concrete. J Mater Cycles Waste Manag 20, 469–480 (2018). https://doi.org/10.1007/s10163-017-0604-6

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