International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 10 | Oct 2023
p-ISSN: 2395-0072
www.irjet.net
An Experimental study on durability properties of bacterial concrete with nano silica. Kodavati Divya Bharathi1, Dhondy Rupesh Kumar2, 1Research scholar, Civil Engineering Department, University college of Engineering, Osmania University, Hyderabad,
Telangana. 2Professor, Civil Engineering Department, University college of Engineering, Osmania University, Hyderabad,
Telangana. ---------------------------------------------------------------------------***--------------------------------------------------------------------------ABSTRACT: Rapid chloride penetration is a major issue in concrete structures, leading to corrosion and potential structural damage. Bacterial concrete has emerged as a promising solution, with bacteria added to the concrete mix producing calcium carbonate that can fill cracks and crevices to inhibit chloride penetration. However, the effectiveness of bacterial concrete can be further improved with the addition of nano silica. This abstract focuses on a study that examines the effect of nano silica on the rapid chloride penetration of bacterial concrete. The study compares the performance of bacterial concrete with and without the addition of nanosilica, analyzing the reduction in chloride penetration rate. The results show that the addition of nanosilica to bacterial concrete further reduces the rate of chloride penetration, making it a more effective solution for preventing corrosion in concrete structures. The findings have significant implications for the construction industry, as the use of bacterial concrete with nanosilica can improve the durability and sustainability of concrete structures, extending their service life. Test on Mechanical properties have perfomed with 10^5 cells/ml with nano silica (0%,0.5%,1%,1.5%,2%) on different grades of concrete(M20,M30,M40,M50),at 1.5% of nano silica with bacteria has achived higher strength, further durability studies is proceeded.
Keywords: Bacterial concrete ,bacillus subtilis, nanosilica, Rapid chloride penetration test. INTRODUCTION: Bacterial concrete is a new and innovative technology that utilizes bacteria to improve the strength and durability of concrete. In recent years, the addition of nanoparticles to concrete has gained significant attention due to their ability to enhance its mechanical and durability properties. One such nanoparticle is Nanosilica, which has been shown to improve the resistance of concrete to chloride penetration, a critical factor in concrete durability. The rapid chloride permeability test (RCPT) is a widely accepted method for assessing the chloride resistance of concrete. The test measures the ability of chloride ions to penetrate through the concrete under an electrical gradient. The lower the chloride penetration, the more resistant the concrete is to chloride-induced corrosion. The addition of Nanosilica to bacterial concrete has shown promising results in improving its resistance to chloride penetration. The nanoparticles fill the pores and micro-cracks in the concrete, reducing its permeability to chloride ions. The use of bacterial concrete also promotes the precipitation of calcium carbonate, which further reduces the permeability of the concrete. This combination of bacterial concrete and Nanosilica has the potential to significantly improve the durability of concrete structures, particularly in harsh environments. This introduction of new technology will help to promote sustainable infrastructure development and contribute to the reduction of carbon footprint.
Experimental Programme: The experimental programme was designed to compare the durability properties i.e., rapid chloride penetration test of concentional concrete and bacterial concrete with nanosilica dosage (0%,0.5%,1%,1.5,2%).
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