Behaviour of Sustainable Bio-Concretes Manufactured with Tap and Magnetized Water

Concrete is an important construction material, but it has a weak point in cracking. To overcome the repair of cracking, researchers have discovered that adding bacteria to concrete heals cracks. Besides that, adding eco-friendly materials has recently become a trend to enhance concrete performance. One of these methods is using magnetized water (MW) in concrete mixing. Using bacteria with MW gives high strength and low maintenance requirements, leading to reduced carbon dioxide emissions and cost. In this study, two different percentages of bacteria, Bacillus megaterium genus, 2.5 and 5% of the cement weight, were added to the concrete, which will be mixed with TW and MW. Water physicochemical properties were recorded for TW and MW. A slump cone test was conducted to assess the workability of the concrete. Compression and indirect tension were conducted for hardened properties. Also, the microstructure of the concrete was examined using a scanning electron microscope (SEM) and x-ray diffraction (XRD) analysis. The results showed an increase in water temperatures, PH, and Total dissolved solids (TDS) with the magnetic device by 11.8, 11.3 and 6.52% respectively, while a decrease in Electrical conductivity (EC). Using magnetized water in concrete enhances concrete workability. In addition to using bacteria with MW, which enhances concrete properties. SEM photos showed that using MW gives a denser structure than the control sample, and fewer voids appear in the bacterial content. These findings indicate that combining bacteria with MW can be used in infrastructure projects that require high durability and low maintenance.