Biological growth properties of marine Enteromorpha-diatom and its adhesion evolution on mortar surfaces

Currently, most research on bio-corroded mortar focuses on cyanobacteria and microorganisms in the marine environment, but the specific mechanism of mortar performance at different stages of the specific biological system of marine dominant algae, Enteromorpha-diatom, is still lacking. Therefore, this paper investigates the growth characteristics of Enteromorpha-diatom proliferation organisms and their attachment evolution on mortar. First, the concentration of Enteromorpha spores over 0 to 15 days was studied. Subsequently, the effects of Enteromorpha-diatom on the properties of mortar at different growth stages over 0 to 360 days were investigated through changes in pH, DO (dissolved oxygen), microstructure, mineral composition, and microstructure in the culture medium. The results showed that Enteromorpha-diatom organisms significantly affected the pH and DO in water through photosynthesis and metabolic activities. Additionally, the adhesion of Enteromorpha-diatom organisms significantly impacted the mechanical properties of mortar, with compressive strength decreasing by 46.1% and flexural strength decreasing by 39.0% over 0 to 360 days. Furthermore, the formation of biofilm, deposition of CaCO 3 , and accumulation of organic and inorganic substances altered the microstructure of mortar, changing its electrochemical characteristics. The electric flux change rate was 46.1%, and the internal impedance decreased by 59% over 0 to 360 days.