Gypsum is an ancient material, still widely used and suitable for many applications in the constructions, due to its low cost, availability, lightweight, good thermal and sound isolating behavior, fire resistance and low energy consumption. Nowadays gypsum have several applications spacing in different engineering fields. For example, on one hand it can be adopted as pattern material to produce high quality composite pipes via autoclave and on the other it can be adopted as building material for the production of gypsum walls that in some case can be reinforced by vegetable or synthetic fibers. These applications, that can appear completely different and unlinked, are characterized by an important common key point: the possibility of using more and more times the gypsum material. Therefore, considering that nowadays every industrial company needs to decrease the materials waste, increase recyclability and use more eco-friendly materials; this paper aims on the study of the recyclability process of both standard and lightweight gypsum. For the production of the lightweight gypsum, a vegetable protein was adopted as foaming agent and the manufacturing technique was here discussed. Bending and compression tests were preliminary conducted to know the starting mechanical properties of both standard and foamed gypsum. Then, tested specimens were reduced in small pieces and subjected to the recycling process. The recycling process mainly consists in two steps: grinding for the reduction of gypsum in powders of established granulometry size and heat treatment of the powders to pass from dehydrate to hemihydrates phase of gypsum. Then the effects of the grinding time, temperature and time of the heat treatment on the flexural and compression behavior of gypsum up to 4 recycles were investigated. The results showed that if the recycling parameters are properly setted, both foamed and standard gypsum can be recycled up 3 times without significant variation of the mechanical properties and of the gypsum mixture workability.
Recyclability process of standard and foamed gypsum / Boccarusso, L.; Durante, M.; Iucolano, F.; Langella, A.; Minutolo, F. M. C.; Mocerino, D.. - In: PROCEDIA MANUFACTURING. - ISSN 2351-9789. - 47:(2020), pp. 743-748. (Intervento presentato al convegno 23rd International Conference on Material Forming, ESAFORM 2020 tenutosi a deu nel 2020) [10.1016/j.promfg.2020.04.227].
Recyclability process of standard and foamed gypsum
Boccarusso L.
Primo
;Durante M.;Iucolano F.;Langella A.;Mocerino D.
2020
Abstract
Gypsum is an ancient material, still widely used and suitable for many applications in the constructions, due to its low cost, availability, lightweight, good thermal and sound isolating behavior, fire resistance and low energy consumption. Nowadays gypsum have several applications spacing in different engineering fields. For example, on one hand it can be adopted as pattern material to produce high quality composite pipes via autoclave and on the other it can be adopted as building material for the production of gypsum walls that in some case can be reinforced by vegetable or synthetic fibers. These applications, that can appear completely different and unlinked, are characterized by an important common key point: the possibility of using more and more times the gypsum material. Therefore, considering that nowadays every industrial company needs to decrease the materials waste, increase recyclability and use more eco-friendly materials; this paper aims on the study of the recyclability process of both standard and lightweight gypsum. For the production of the lightweight gypsum, a vegetable protein was adopted as foaming agent and the manufacturing technique was here discussed. Bending and compression tests were preliminary conducted to know the starting mechanical properties of both standard and foamed gypsum. Then, tested specimens were reduced in small pieces and subjected to the recycling process. The recycling process mainly consists in two steps: grinding for the reduction of gypsum in powders of established granulometry size and heat treatment of the powders to pass from dehydrate to hemihydrates phase of gypsum. Then the effects of the grinding time, temperature and time of the heat treatment on the flexural and compression behavior of gypsum up to 4 recycles were investigated. The results showed that if the recycling parameters are properly setted, both foamed and standard gypsum can be recycled up 3 times without significant variation of the mechanical properties and of the gypsum mixture workability.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
