A concrete made with coal ashes proves to be as resistant as that obtained with quarry aggregates
A concrete made with coal ashes proves to be as resistant as that obtained with quarry aggregates
.A concrete made with coal ashes proves to be as resistant as that obtained with quarry aggregates
A research team from the University of Córdoba in collaboration with the University of Navarra (Spain) manages to substitute natural resources for waste from thermoelectric plants in the manufacture of concrete for structural use and shows that it has the same qualities for construction.
The overexploitation of quarries to obtain sand and gravel for the manufacture of concrete is one of the great environmental challenges of the moment. Although they look like it, the stones are not endless. For this reason, the scientific community has been looking for years to develop concrete without depleting the earth's crust. And they do it by approaching the problem from different perspectives. This is the case of two teams from the University of Córdoba that have worked together to obtain a material that is as resistant and durable, but more sustainable. Chemists and engineers have done it by hand.
Specifically, the research group "Materials and Applications" (FQM391) led by Professor José María Fernández and the "Construction Engineering" (TEP227) led by Professor José Ramón Jiménez have managed to manufacture a self-compacting concrete by replacing natural resources with waste derived from the combustion of coal. In particular, these researchers have managed to use the non-compliant ashes of the thermoelectric plants instead of the ultrafine fraction of natural aggregates (filler silicon) extracted from quarry stone and grinding.
The study, recently published in two issues of the magazine Construction and BuilingMaterials, has consisted of a physical-chemical analysis of the ashes and subsequently the design and testing of mixtures with these ashes instead of the ultrafine fractions (filler) of quarries. And all with the objective of obtaining concrete more friendly to the environment. After numerous tests, the research group has managed to produce a concrete with the mechanical properties and durability suitable for use in construction. Seven years of work have served to achieve a self-compacting structural concrete with better performance than those made with conventional materials, according to the directors of the research.
In addition to optimizing natural resources and the recovery of waste, the work of UCO researchers, in whose analysis they have had the collaboration of the University of Navarra, offers an outlet to coal-fired power plants. And, the fly ashes accumulate in these factories without any utility and their final destination are controlled landfills. This study opens an interesting horizon to give it utility and change its destiny.
With this new concrete is planned the manufacture of prefabricated elements for structural use as beams, supports or elements of slabs. The intention of the research team involved is to industrialize the new concrete.
The fly ash for the development of the investigation comes from the thermal power station of Puente Nuevo, located between the towns of Espiel and Villaviciosa de Córdoba. (Photo: UCO)
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