Influence of Fascinating Diatom Fragilaria and Synechocystis Cyanobacteria on the Permeation Performance, Mechanical Properties, and Self-Healing Abilities of Concrete Under Curing Fresh Water and Seawater

Abstract This study investigates the impact of innovative diatom and cyanobacteria strains at varying concentrations on microbe concrete. The study examines the behavior of two separate species of microalgae, specifically diatom ( Fragilaria sp. CCAP1029) and Synechocystis PCC 6803 cyanobacteria, on concrete. The study confirmed that bio-concrete has greater strength than conventional concrete across all concentrations. The specimens containing Synechocystis PCC 6803 demonstrated a significant enhancement in compressive strength and splitting tensile strength, with a rise of 21.66% and 10.34%, respectively. Furthermore, utilizing all the introduced microalgae significantly reduced the corrosion rate of non-accelerated samples. Additionally, the analysis (SEM and EDX) revealed the existence of microbiological calcite precipitation within the concrete’s pores. The study’s findings emphasize the effectiveness of the introduced microorganisms in enhancing and improving the mechanical properties and encourage crack healing in microbial concrete.