Bacteria-based repair and self-healing of concrete

Abstract

Durability problems in concrete can often be linked to a high permeability, which is either caused by a high matrix permeability or the presence of cracks. Therefore, treatments that reduce the permeability of the matrix, or that close the crack from ingress of aggressive agents carried by water or air, would substantially enhance the service life of a concrete structure. Several chemical products are currently in use for consolidation and crack repair, but a new technique that has been the focus of much research efforts over the last decade is the bacteria-based calcium carbonate precipitation. This technique is now slowly making its way towards practical applications. The principles of the technique, the important influential parameters and the recent advances related to its use for consolidation, surface protection, external crack repair, and self-healing of cracks in concrete are discussed in this article. Also the wider applicability for mechanical strengthening and consolidation of natural stone and soils is shortly treated

Biostimulation in Desert Soils for Microbial-Induced Calcite Precipitation

“…Microbial-induced calcite precipitation (MICP) is one of the most promising biogeochemical treatments that effectively changes the hydromechanical and environmental properties of materials. Potential applications range from groundwater remediation and sequestration of radionuclides [40] to self-healing concrete [41]. For engineered materials, such as concrete, MICP can be achieved via bioaugmentation only, i.e., the introduction of monoclonal cultivated bacteria.…”

Application of bacteria in concrete: a critical evaluation of the current status

“…For more information on carbonate precipitation in construction materials the reviews of Castanier et al [6] and De Muynck et al [7] can be consulted. More recent information is included in an updated paper [8]. Many bacteria can mediate the formation of calcium carbonate according to various metabolic pathways if given suitable conditions (Table 1).…”

“…Nevertheless, a straight comparison is difficult to make, since there are many different factors governing the CaCO 3 precipitation yield, that need to be optimized and that furthermore interact with each other [8], such as bacterial cell concentration, concentration of urea, organic acids or nitrate (for the above mentioned pathways), and calcium concentration.…”

Pola Pertumbuhan Bakteri Ureolitik pada Medium Calcium Carbonat Precipitation (CCP)

“…Urea menyediakan energi dan sumber nitrogen untuk bakteri. Urea juga berperan sebagai sumber ion karbonat (CO3 2-) dalam presipitasi kalsium karbonat CaCO3 [13]. ATP yang dihasilkan berhubungan dengan produksi ion ammonium (NH4 + ) dari hidrolisis urea [14].…”