Compounds are made of gypsum and plastic cable waste as aggregates.• Water absorption and retention capacity are lower in compounds with plastic waste.• Plastic cable waste addition decreases the total pore volume maintaining the size.• Plastic cable waste in gypsum matrices decreases the use of natural resources.• Compounds with plastic cable waste minimise environmental impacts in construction.

Environmental protection involves the reuse of construction and demolition waste. In order to improve recycling, waste from laminated plasterboards is used in the cement and laminated gypsum boards manufacture. This article analyzes the use of ground and burnt laminated plasterboard (BLG) waste mixed with thick gypsum (TG). Physical-mechanical characterization of superficial hardness and mechanical strength has been performed on different batches of plaster powder materials with different BLG waste particle sizes to determine its suitability. Coarse particle sizes were preferred in order to reduce the waste treatment. From all the mixtures studied, the one with the best results was TG + 5% BLG 1.25 which forms a material of higher superficial hardness and strength. The results obtained in the study have proved suitable products for building use (both as renders and as prefabricated elements) enabling for a reduction in the consumption of natural resources.

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RESUMENLa necesidad de disminuir la cantidad final de residuos de construcción y demolición que se producen en las plantas de prefabricados de hormigón nos ha llevado a analizar el comportamiento mecánico de un hormigón elaborado con áridos reciclados procedentes de piezas prefabricadas de hormigón, con la finalidad de un posible futuro uso como árido en dosificaciones de hormigón armado y pretensado para piezas prefabricadas. Se ha trabajado con áridos reciclados en dos situaciones: estado natural y sometidos a presaturación, con hormigones H40 y H50 autocompactantes, tomando como única variable la sustitución de fracción gruesa del árido 4/12 mm con los siguientes porcentajes, 0%, 20%, 50% y 100%. Los resultados de los ensayos realizados indican que hormigones elaborados con áridos reciclados procedentes de elementos prefabricados pueden presentar una excelente calidad como hormigón estructural para su futuro uso como autoconsumo.Palabras clave: árido reciclado, hormigón, dosificación, resistencia mecánica, residuos. SUMMARYThe need to diminish the final amount of waste produced in construction and demolition processes in plants of concrete prefabricated products, has made us analyze the mechanical behaviour of concrete made with recycled aggregate coming from discarded concrete prefabricated units. The aim was to find a possible use for this recycled aggregate in different proportions in reinforced concrete and prestressed concrete, for prefabricated elements. Two situations using recycled aggregate have been studied: one of them, in natural state and subject to pre-saturation with selfcompacting H40 and H50 concrete, using as the only variable the substitution of the 4/12 mm coarse aggregate in the following percentages: 0%, 20%, 50% and 100%. The results of the tests performed indicate that concretes with recycled aggregate coming from discarded prefabricated units can offer an excellent quality as structural concrete for future uses. Keywords INTRODUCCIÓNEl creciente aumento en la generación de residuos y la falta de lugares donde depositarlos impone a la sociedad la necesidad de habilitar mecanismos de gestión que permitan dar una respuesta adecuada ante tal situación. El sector de la construcción debe dar respuesta y aportar soluciones sostenibles que minimicen los efectos de los residuos que generan, promoviendo iniciativas de reciclado dentro de la propia actividad.Este estudio analiza la viabilidad de la utilización del ári-do reciclado (AR) procedente de las piezas prefabricadas de desecho que se generan durante el proceso de fabricación en la planta de prefabricados de la empresa PRAINSA en Zuera (Zaragoza), como árido en dosificaciones de hormigón armado y pretensado de autoconsumo.La fábrica de PRAINSA desecha un 5% del total de las piezas fabricadas en los procesos de calidad. Estos elementos, durante todo su proceso, sufren un exhaustivo control que garantiza una mayor homogeneidad del AR con respecto a los fabricados con productos de demoliciones de hormigón, asegurando la no contaminación del...

This article analyzes the effect of fire on plasterboards with aggregates of plastic cable waste, considering the plaster coating as a strategy to reduce the flammability of the added polymers. A real test was performed, using a direct fire set in a Madrid fire station, and a theoretical estimate of the composition of the gas emissions, focused in CO 2 and CO, during a fire in a type room is presented. The results reflect that there is no clear trend between the evolution of temperatures over time and the amount of plastic waste added to the plaster matrix in the different specimens, but a different behavior is obtained depending on the surroundings where they are located. Temperatures of 600 • C are reached between 5 and 10 min after the start of the fire if they are located in a place with heat containment, and they do not reach 400 • C in the same period of time in a place with less heat containment. It was also observed that gypsum can be considered a passive protection of polymers, as it retards the effect of the flame on them. Concerning the gases released, the theoretical calculations, based on the elemental and thermogravimetric analysis of the plastic cable waste, reveal that the amount of carbon dioxide generated in a fire would not pose a risk to people's health whereas the values obtained for the carbon monoxide exceed the limited considered dangerous to health for a period greater than 15 min. Using plastic cable waste as secondary raw material reduces the number of incinerations to be carried out in landfills with this type of waste, thereby decreasing the potential emission of contaminants into the atmosphere and contributing to the sustainability of our planet.