Abstract
Specific microbial agents such as bacteria are often used in concrete to improve its performance. Some microbes act as self-healing agents to close cracks in concrete, and to increase concrete strength. This paper presents a study to observe the effects of microbe addition to two types of concrete mixtures the fly ash-based, as geopolymer paste, and portland cement paste containing fly ash. Furthermore, the investigation was conducted to compare the properties of each paste, such as its compressive strengths, specific gravities, porosity, microstructures, and XRay diffracting properties. The results indicate that microbial activities positively affected the properties of both, portland cement paste and geopolymer paste. The result reported here strongly suggests that fly ash can be used to produce a high quality, but environmental friendly construction material when it’s mixed together with useful microbes.
Highlights
The approach of biochem technology is often used to increase the properties of cementbased materials called bio-mineralization [1]
It is found that the calcium carbonate as microbes product, for healing the micro cracks, and responsible to change the properties of the concrete mixtures [6]
Calcite increased when there is an additional microbial agents inside the paste, as the result of the bacterial metabolism. It shows that bacteria influenced the content of calcite, according to the X-Ray Diffractometer (XRD) result
Summary
The approach of biochem technology is often used to increase the properties of cementbased materials called bio-mineralization [1]. Bacteria from the genus Bacillus and Sporosarcina are one of the most widely used that has the ability to tolerate high pH, temperature, alkaline conditions, and live inside the concrete [5,6] It is caused by a precipitate ion of CaCO3, from converting urea into ammonium and carbonate [7] and change the properties of the concrete mixtures and soil structures [8,9]. This type of bacteria forms endospores [10,11], so that it can survive without nutrients and water for hundreds of years [12]. The effectiveness of microbes activities in the paste is one of the important factors to apply the paste as potential material or artificial aggregates
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