Bio product used in the self-sealing process of microcracks in hydrotechnical concretes

Abstract This paper is focused on quantifying the influence of the Bio materials that are used in the self-healing process of concrete. The Bio material that was studied has a high content of calcium carbonate, which, after precipitation, may lead to the sealing of the microcracked surface of concrete. This nucleation process is possible only in humid environments; thus, water has a paramount role in ensuring the mobility of the molecules. The difference between a complete and a partial seal is given by the amount of the Bio product that is available in the cracked area, the size of the calcium carbonate particles and the amount of water. For this study, the SEM Quanta Dual Beam device was used, through which scans were performed by electron microscopy, in order to observe the precipitation of the Bio product on the cracked surface. The chemical process throughout the sealing takes place has been presented through various illustrations and reports. By analysing previous experimental studies, it might be stated that the use of calcium carbonate in various forms is a sustainable and an environmentally friendly repair solution that, also, may improve the durability of cement-based materials. The use of ecological products in new cement-based materials is one of the main topics of worldwide interest for various research teams.</jats:p

Ecological and economic impact of an innovative bioproduct used to consolidate the concrete elements of hydrotechnical constructions

Abstract The present paper takes into observation the evaluation of the environmental and economic impact of a innovative bioproduct that can be used in order to reduce the volume of rehabilitation works needed during the life cycle of different structural reinforced concrete elements utilized for hydrotechnical constructions. In order to determine the performances of the analysed material, seven scenarios that imply the use of different rehabilitation solutions have been considered. In order to achieve the goal of the study, the Cradle-to-Gate Life Cycle Assessment type of study was used. The amount of materials, the distances from the extraction point to the site of the materials and the implementation technology are detailed in all proposed scenarios. In recent years, researchers carried out various studies on the use of raw materials in different compositions, with different quantities, in order to improve the sustainability and mechanical characteristics of constructions, as well as to increase the users’ level of satisfaction. The research and development of new types of materials that can be used in the construction sector with a low ecological influence will have a tremendous positive impact over the present state of the natural environment. The authors conclude that by considering the resulted values, the analysed solution based on the use of calcium carbonate can be considered a suitable solution with respect to the environmental and economic dimensions of sustainability.</jats:p

Special Section Guest Editorial: Translational Biophotonics

This guest editorial introduces the Special Section on Translational Biophotonics