Influence of Multi-Stage Processing and Mechano-Chemical Treatments on the Hydration and Microstructure Properties of Recycled Aggregate Concrete

Article


Trivedi, S. S., Sarangi, D., Das, B. B. and Barbhuiya, S. 2023. Influence of Multi-Stage Processing and Mechano-Chemical Treatments on the Hydration and Microstructure Properties of Recycled Aggregate Concrete. Construction and Building Materials. 409 (Art. 133993). https://doi.org/10.1016/j.conbuildmat.2023.133993
AuthorsTrivedi, S. S., Sarangi, D., Das, B. B. and Barbhuiya, S.
Abstract

On account of the shortage of naturally occurring coarse aggregate, recycled aggregate (RA) made from crushed concrete debris is now used in the construction industry. With this rise in the utilisation of recycled aggregate in the construction sector, there has been extensive research into ways to improve its quality. The significant fraction of mortar remains that are left on the RA surface is the primary factor that affects its quality. Concrete made from RA loses strength and mechanical performance due to the attached mortar's increased porosity and water absorption values and the frailer transition region between the new mortar and aggregates. In order to minimise the old cement fractions and increase the quality, this paper studies the effect of concrete incorporating multi-stage processed RA from demolished concrete waste, followed by treatment with mechanical abrasion and sodium silicate immersion. The recycled aggregates were produced through multi-stage jaw crushing, followed by utilising natural aggregate, recycled aggregate, and recycled aggregate obtained after mechanical abrasion, followed by sodium silicate treatment for concrete mix design at various substitution percentages as coarse aggregates. The experimental investigation further progresses with the evaluation of mechanical and durability properties of concrete mixes, which is additionally followed by microstructural studies such as scanning electron microscopy (SEM), Energy dispersive X-ray spectroscopy (EDAX), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and Thermogravimetry-differential thermal analysis (TG-DTA). The outcomes demonstrate that two-stage treatment, such as mechanical abrasion followed by sodium silicate immersion, yields superior-quality RA. Recycled aggregate concrete (RAC) made with these treated aggregates illustrated an increase in workability and density with respect to an untreated RAC mix. Furthermore, comparable strengths in compression, flexure, and tension are found in treated RAC mixes, particularly at 35% replacement levels, with respect to concrete mixes comprised of natural aggregates. A similar trend is detected in the chloride penetration tests and water sorptivity tests. In addition, the microstructural investigation confirmed the formation of additional calcium silicate hydrate for treated RAC mixes, particularly for the 35% substituted RA mix. On the basis of the results, it is suggested that multi-stage jaw crushing followed by treatment through mechanical abrasion and sodium silicate can potentially enhance the mechanical, microstructural, and durability performance of RAC.

Keywordsdemolished concrete waste; multi stage processing; mechanical scrubbing; sodium silicate treatment; microstructure; recycled aggregate concrete; sustainability
JournalConstruction and Building Materials
Journal citation409 (Art. 133993)
ISSN0950-0618
Year2023
PublisherElsevier
Accepted author manuscript
License
File Access Level
Anyone
Digital Object Identifier (DOI)https://doi.org/10.1016/j.conbuildmat.2023.133993
Publication dates
Online02 Nov 2023
Print15 Dec 2023
Publication process dates
Accepted26 Oct 2023
Deposited03 Nov 2023
Copyright holder© 2023, The Authors
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