Estudio experimental sobre propiedades mecánicas y de durabilidad de hormigones estructurales autocompactantes con áridos reciclados y su aplicación a la prefabricación

Abstract

The construction industry and all those related to cement consume a lot of natural resources. The extraction of natural aggregates used to manufacture mortars and concretes is an increasing problem, due to the exhaustion of the quarries and the increasing regulatory requirements, such as environmental impact.Cement related industries, all those related to prefabricated structural elements for use in building and civil engineering, provide industrial and technological development of a country, being indispensable in the construction process.In Spain there are a lot of companies of precast structural and non-structural concrete. These companies generate waste as a result of the manufacturing process.The use of these wastes for incorporation back to the supply chain saves money and contribute to the sustainability. If you also apply the latest modern technology, the self-compacting concrete, the result can be unbeatable.The research develops an experimental study of a real case of a company of structural precast concrete, in which we studied the incorporation of waste as recycled aggregate, self-compacting concrete in order to manufacture new precast elements. The experimental study involves several states crushing precast rejected components recycled aggregate characterization and mix design of the new selfcompacting concrete.The experimental study evaluates the mechanical properties and durability of the concrete with percentages of incorporation as 20%, 50% and 100% of recycled aggregate.To validate the experimental laboratory study also on industrial testing in the factory itself with the environment and manufacturing usual methods and with the dosages employed is carried out. A study of several assembled parts is also performed, checking structural behavior, flexural, splitting, cutting and deformation.Finally, an economic study of concrete made with recycled aggregates is performed, raising it several options for obtaining the resulting aggregate in the factory itself, or with the intervention of a nearby treatment plant.

Influence of Recycled Precast Concrete Aggregate on Durability of Concrete’s Physical Processes

“…Finally, recycled aggregate (RA) was used as an alternative to the coarsest aggregate, from crushed precast concrete waste with a size of 4/12.5 mm. This RA was obtained after crushing and grinding different unusable precast pieces [27], such as those shown in Figure 1. RA was used as an alternative to silica gravel.…”

“…It can be seen that numerous studies have examined the use of concrete waste in the manufacture of new concrete, however, few studies relate to the use waste from the precast sector [6,13,26,27].…”