Calcium Carbonate in Bio-Based Material and Factor Affecting Its Precipitation Rate for Repairing Concrete

Abstract

The use of bio-based material for repairing concrete is a relatively new method. Therefore, more results from simulated real-condition experiments are needed before being applied on a practical scale. In the recent past, several studies have been conducted on the improvement of bio-based repair materials. In this study, the bio-based material involving yeast, glucose, and calcium acetate mixed in a Tris buffer solution showed the potential to develop a microbial process leading to the precipitation of calcium carbonate. We investigated the factors affecting the precipitation rate of the calcium carbonate of bio-based materials for repairing leakage in the concrete specimens. Based on a series of experiments involving temperature, the type of dry yeast, and the concentration of the Tris buffer solution, the composition of bio-based materials with the highest precipitation rate of calcium carbonate was selected. The selected mixture could be applied to repair leakage of concrete until the cracks are sealed entirely.

Effect of sodium alginate on the properties of microbial repair materials and its repair effect on mortar crack

“…The Ca 2+ concentration in the solution gradually decreased as the reaction time was prolonged. That was due to the continuous microbialinduced mineralization, and the bacteria used urease to decompose urea to produce CO 3 2− , which gradually combined with Ca 2+ in the solution to produce CaCO 3 crystals (Putri et al, 2020). In addition, as shown in Figures 4A,C,E, the Ca 2+ concentration in the beaker solution decreased faster as the percentage of bacterial solution in the repair material component A increased, in which the Ca 2+ concentration in A-2, A-3, A-4, and A-5 could decrease from the baseline 2.0 to 0 mol/L after 120, 108, 72, and 48 h, respectively.…”

The effectiveness of the multi-soil-layering system in reducing pollutant parameters of crumb rubber industrial wastewater

“…If zeolite is replaced with zeolitized perlite, perlite, charcoal or gravel, the efficiency of the system in purifying wastewater changes depending on the content of the material. Zeolitized perlite, perlite, and charcoal have high specific areas so that they can absorb organic material as well as zeolite [46]. Gravel has a smaller specific area compared to the previous material but the organic material is placed around the gravel particles so that it can purify wastewater [47].…”