Gypsum plaster waste recycling: analysis of calcination time

de Moraes Rossetto, Jaqueline Rosalí; Santos Correia, Lucas; Henrique Geraldo, Rodrigo; Camarini, Gladis
March 2016
Key Engineering Materials;2016, Vol. 668, p312
Academic Journal
The gypsum plaster is a material widely used in constructions around the world. It is a material with high versatility that can be applied from wall coverings to decorative ornaments. However, during its application in buildings, large amounts of waste materials are generated. The average values of waste during its application are higher than 45% of the gypsum amount used. A series of tests were conducted to develop a feasible methodology to reuse this waste material. The results collected at this stage indicated that it is possible to obtain a recycled product with low energy consumption. It was noted that after a certain number of procedures in which gypsum was subjected to recycling, there was a loss of workability; however, it did not present relevant changes in mechanical properties. This lack of workability avoids the recycled material maintain its properties in the fresh state as it is subjected to recycling. This work evaluates the calcination time of gypsum plaster waste for the production of a gypsum plaster with binder properties for using as components. The temperature of calcination was kept constant (150 °C), but the residence time in the stationary kiln was modified. The properties in the powder state (bulk density, fineness modulus, specific mass and sieve analysis), fresh state (mini-slump, setting times and kinetics of temperature) and in the hardened state (compressive strength and hardness) were analysed in order to have some answers about the performance of the recycled gypsum. In the fresh state, the recycled material showed good results for precast components. The initial setting times were good for all residence times and the final setting times for the material calcined in periods of 5 and 6 hours. In the hardened state, the best compressive strength results were obtained for all residence times, and hardness for calcination for 3, 4, 5 and 6 hours. All these results were satisfactory when compared to the commercial plaster took as reference. On the other hand, there was a lack of workability in those pastes indicating that an admixture is needed to adjust this property of the recycled material.


Related Articles

  • Study of the potential employment of Malvaceae Species in composites materials. Gama Guimarães, Bárbara Maria; Cayuela Marín, Diana; Fernando Zonatti, Welton; Mantovani, Waldir; Relvas, Cátia; Cunha, Fernando; Fangueiro, Raul; Savastano Júnior, Holmer; Baruque-Ramos, Júlia // Key Engineering Materials;2016, Vol. 668, p75 

    The employ of vegetal fibers for textiles and composites represents a great potential in economic and social sustainable development. Some Malvaceae species are considered tropical cosmopolitans, such as from Sida genus. Several species of this genus provide excellent textile bast fibers, which...

  • Synthesis Of Silver Nanoparticles With Potential Antifungical Activity For Bamboo Treatment. Pandoli, Omar; Ventura Pereira-Meirelles, Fatima; Lobo Lobo Luz, Eric Monteiro; Assumpção, Aline; dos Santos Martins, Raquel; del Rosso, Tommaso; Ghavami, Khosrow // Key Engineering Materials;2016, Vol. 668, p86 

    To increase the durability of bamboo it is important to find an easy method to fill the micro and meso structure of the biological matrix using a nano-structural material with an anti- fungical activity. A colloidal solution of silver nanoparticle (Ag-NPs) is a dispersion of metal nanoparticle...

  • Sheath bamboo leaves used at high pressure architect. GARCIA, Juliana; JOHN, Vanderley // Key Engineering Materials;2016, Vol. 668, p92 

    Sheath bamboo leaves (SBL) are potential lignocelluloses waste, aimed to produce laminated architectonic coatings. In this work was studied the surface interaction among the SBL and three types of adhesive: Polyvinyl Acetate (PVAc), Castor oil Polyurethane Adhesive bi- component (Vegetal PU),...

  • Analysis of fiber reinforced laminated timber beams. Abade Bertoline, Carlos Augusto; Tadeu Mascia, Nilson; Donizeti Basaglia, Cilmar; Fazendeiro Dodadon, Bruno // Key Engineering Materials;2016, Vol. 668, p100 

    The necessity to restore the design specifications of a determined structure, combined with cost, weight and environmental impact reduction makes the use of high performance composite systems, involving, either synthetic or natural materials, interesting. By applying a layer of fiber...

  • Effect of natural fiber hornification on the fiber matrix interface in cement based composite systems. Rocha Ferreira, Saulo; de Andrade Silva, Flávio; Lopes Lima, Paulo Roberto; Toledo Filho, Romildo Dias // Key Engineering Materials;2016, Vol. 668, p118 

    Several fiber treatments can be applied to mitigate the high water absorption of vegetal fibers. Wetting and drying cycles are usually performed in the industry of paper and cellulose to reduce the volume variation of the natural fibers. This procedure stiffens the polymeric structure of the...

  • The Elastic Modulus and Poisson's Ratio of Laminated Bamboo Guadua angustifolia. Takeuchi, Caori P.; Estrada, Martin; Linero, Dorian L. // Key Engineering Materials;2016, Vol. 668, p126 

    Laminated bamboo is a natural composite material with cellulose fibers, parenchyma cells, and vascular bundles. The mechanical characterization of this material includes not only the determi- nation of its strength, but also of its elastic constants. Given the anisotropic nature of the laminated...

  • Comparative study on the effect that coir fibers have on the dynamic or quasi-static elastic moduli of glass fiber laminates obtained by the vacuum bag technique. Villalón, Mario; Vega, Hugo; Montoya, Nahary; Rubio, Byron; Hernandez, Julio; Mendoza, Omar; Salas-Zuñiga, Roberto; Reyes-Zamora, Ulises; Radillo, Rodolfo; Reyes-Araiza, J. L.; Manzano-Ramírez, A. // Key Engineering Materials;2016, Vol. 668, p137 

    The use of natural fibers has a great interest due to their damping properties, low density and moderate strength. The effect of incorporating chopped natural fibers, as disperse reinforced phase, on the dynamic or quasi-static elastic modulus of glass fiber laminates is presented. Squares of 32...

  • FEASIBILITY OF USING MDP PANELS, COMPARED TO CONVENTIONAL PARTICLEBOARDS. Ribeiro Guimarães, Bárbara Maria; Guimarães Junior, José Benedito; Barbosa Campomori, Jefferson; Farinassi Mendes, Rafael; Marin Mendes, Lourival // Key Engineering Materials;2016, Vol. 668, p145 

    The objective of this study was to investigate, by physical properties, the efficiency of MDP panels, compared to conventional particleboards, since MDP was considered as a raw material for the manufacture of these panels. MDP panels had the following composition: 20/60/20 face/core; a...

  • Application of Enzymes for Stabilization of Soils in Paving. Cardoso Malko, José Adriano; Brazetti, Rubens; Dal Toé Casagrande, Michéle; de Albuquerque e Silva, Ben-Hur // Key Engineering Materials;2016, Vol. 668, p150 

    In recent years, there was a great offer of patented additives (enzymes) to the road market as solution to soil stabilization. However, they are many times rejected because there are no theoretical foundation to prove such uses, and also because researches themselves don't see research...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics