Experimental Study on Self-compacting and Self-healing Concrete with Recycled Coarse Aggregates

Document Type : Original Article

Authors

1 Department of Civil Engineering, Anurag University, Ghatkesar, Hyderabad, Telangana, India

2 Department of Civil Engineering, SVNIT-Surat, Gujarat, India

Abstract

This study focuses on evaluating the effectiveness of various cell concentrations of bacillus bacteria in mending cracks within recycled concrete containing coarse aggregates. In this investigation, the introduction of bacillus bacterial sustainable concrete as a solution for addressing crack repairs. This innovative concrete formulation not only provides environmentally friendly alternatives but also offers economic benefits. This research involves the incorporation of coarse aggregates into the concrete mix, along with the partial substitution of cement by Fly ash and Ground Granulated Blast Furnace Slag (GGBS), each accounting for 20% of the mix. The coarse aggregates consist of Recycled Concrete Aggregate (RCA) in varying proportions: 0%, 50%, and 100%. Additionally, Bacillus licheniformis was used at concentrations of 103, 105, and 107 cells/mL, respectively. The findings indicate a positive correlation between the healing percentage of cracks, as measured by Ultrasonic Pulse Velocity (UPV), and the concentration of bacteria. Furthermore, it is observed that recycled aggregates possess inherent pores that allow for water absorption through these pores. Therefore, RCA is subjected to a 24-hour water immersion process before its incorporation into the concrete mix. While the compressive strength of the concrete remains consistent between RCA 0% and RCA 50%, it decreases significantly at RCA 100%. However, the performance of the bacteria exhibits proportionality to cell concentration. Notably, the effectiveness of the bacteria remains consistent regardless of changes in RCA proportions. This study underscores the promising potential of Bacillus bacteria in enhancing the durability and sustainability of concrete structures, with particular relevance to RCC applications.

Graphical Abstract

Experimental Study on Self-compacting and Self-healing Concrete with Recycled Coarse Aggregates

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References

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International Journal of Engineering
Volume 37, Issue 4
TRANSACTIONS A: Basics
April 2024
Pages 625-634

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