Effect of Sporosarcina bacteria and ﬂy ash on concrete self-healing ability

Sadeghpour, Mahmoud; Baradaran, Mohammadreza

doi:10.22124/jcr.2022.21953.1568

Effect of Sporosarcina bacteria and ﬂy ash on concrete self-healing ability

Document Type : Research Paper

Authors

¹ 2- Department of Civil Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran.

² 2- Department of Civil Engineering, Meymand center, Islamic Azad University, Meymand, Iran.

10.22124/jcr.2022.21953.1568

Abstract

In this paper, the effect of bacteria on self-healing concrete with fly ash has been studied. Sporosarcina bacteria with four different concentrations were used for evaluation. In concrete with fly ash, fly ash is replaced by 20% by weight of cement of mixing design has been used. In order to evaluate and control the specimen, destructive and non-destructive tests such as ultrasonic, permeability, water absorption and compressive strength have been used. To evaluate the effect of bacteria on self-healing of concrete cracks, concrete cracks were studied using scanning electron microscopy (SEM) and light microscope. The results show that the concentration of 10.46 × 106 is the most suitable concentration of Sporosarcina for the production of calcite and filling the pores of concrete by products such as calcium carbonate. The mentioned concentration resulted in a 36% increase in compressive strength in specimen with fly ash and a 30% increase in specimen without fly ash. The results also showed that increasing the bacterial concentration did not cause significant changes in compressive strength, water absorption, impermeability and ultrasonic wave velocity.

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