Microstructural and mineralogical compositions of metakaolin-lime-recycled gypsum plaster ternary systems

Gypsum waste from building constructions is a material which can contaminate the soil and groundwater if is disposed directly in the soil or landfill without any control. In Brazil, these wastes are considered a recycle and/or recovery material, but the research of gypsum plaster recycling are very few at this moment. In this way, this work presents the microstructural characterization of two types of recycled plaster. The recycled plaster was produced by a grinding and calcination the building construction waste. Microstructural characteristics were evaluated by SEM observations. The results show similarities between crystals of recycled and commercial plasters.

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Recycled gypsum block: development and performance

Ambiente Construído ◽

10.1590/s1678-86212019000200307 ◽

2019 ◽

Vol 19 (2) ◽

pp. 45-58

Author(s):

Clóvis Veloso de Santana ◽

Yêda Vieira Póvoas ◽

Deborah Grasielly Cipriano da Silva ◽

Francisco de Assis Miranda Neto

Keyword(s):

Mechanical Performance ◽

High Volume ◽

Superior Performance ◽

Performance Standard ◽

Chemical Recycling ◽

Fresh State ◽

Gypsum Plaster ◽

And Performance ◽

Recycled Gypsum ◽

Recycled Material

Abstract The gypsum plaster waste is still faced a serious economic and environmental problem. Considering the high volume and the destination often inadequate. Intending to provide a mitigating alternative, this research intends to develop blocks that incorporate the industrial gypsum plaster waste through reverse logistics. For this, a physic-chemical recycling process of gypsum plaster waste was carried out on an industrial scale and the developed material was characterized in anhydrous and fresh state. Then, blocks were made with the recycled material and characterized according to NBR 16495 (ABNT, 2016). After its characterization, the material was evaluated for its mechanical performance when used in walls, regarding the tests of suspended vertical loads and hard and soft body impact, according to the guidelines included in the performance standard NBR 15575-4 (ABNT, 2013). The walls constituted with the developed material showed satisfactory performance, having, in some cases, presented superior performance in comparison to the conventional walls of gypsum blocks, according to results presented by the Technical Assessments Document - DATEC nº 27 (2015). Finally, small walls of the recycled gypsum block and gypsum glue were elaborated to verify the compressive behavior. Regarding these verifications, it was noticed that the small walls obtained good resistive capacity.

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Effect of citric acid on properties of recycled gypsum plaster to building components

Construction and Building Materials ◽

10.1016/j.conbuildmat.2016.07.112 ◽

2016 ◽

Vol 124 ◽

pp. 383-390 ◽

Cited By ~ 26

Author(s):

Gladis Camarini ◽

Maria Clara Cavalini Pinto ◽

Aline Goulart de Moura ◽

Natalia Reggiani Manzo

Keyword(s):

Citric Acid ◽

Gypsum Plaster ◽

Building Components ◽

Recycled Gypsum

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Influence of the Heating Temperature and Fineness on the Hydration and Mechanical Property of Recycled Gypsum Plaster

Advances in Materials Science and Engineering ◽

10.1155/2021/7520378 ◽

2021 ◽

Vol 2021 ◽

pp. 1-12

Author(s):

Zhixin Li ◽

Kaidong Xu ◽

Jiahui Peng ◽

Jina Wang ◽

Jianwu Zhang ◽

...

Keyword(s):

Mechanical Property ◽

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

Heating Temperature ◽

Setting Time ◽

High Strength ◽

Initial Setting Time ◽

Gypsum Plaster ◽

Recycled Gypsum

Influence of the heating temperature and fineness on the hydration and mechanical property of recycled gypsum plaster was investigated to find the suitable heating temperature and fineness. According to the results, the setting time of recycled gypsum plaster increased with the increase of heating temperature, and the mechanical strength increased first and then decreased at a temperature of 165°C. Therefore, the suitable heating temperature was 165°C, and at this time, the initial setting time and final setting time were 8 min and 12.5 min, respectively, which met the requirements of the Chinese standard of GB/T 9776-2008. The strength of recycled gypsum plaster increased with the increase of specific surface area, and the low water to plaster ratio and high strength were achieved when the specific surface area was 1526 m2/kg. Therefore, it can be concluded that the suitable heating temperature was 165°C and the suitable specific surface area was 1526 m2/kg considering the properties and economics of recycled gypsum plaster.

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Setting Times of Recycled Gypsum Plaster with Additives

10.19146/pibic-2015-38283 ◽

2015 ◽

Author(s):

Gladis Camarini ◽

Natalia Reggiani Manzo

Keyword(s):

Setting Times ◽

Gypsum Plaster ◽

Recycled Gypsum

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Evaluation of Dehydration Temperature on Properties of Recycled Gypsum Plaster

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.668.275 ◽

2015 ◽

Vol 668 ◽

pp. 275-282 ◽

Cited By ~ 2

Author(s):

Valdir Moraes Pereira ◽

Gladis Camarini

Keyword(s):

Mechanical Properties ◽

Compressive Strength ◽

Physical And Mechanical Properties ◽

Waste Material ◽

Low Energy ◽

Material Loss ◽

Setting Times ◽

Gypsum Plaster ◽

Recycled Gypsum

Gypsum plaster is a material used as internal covering of walls in Brazilian constructions. However, this material has short setting times and generates a great quantity of material loss. The low energy necessary to dehydrate the waste material for utilization becomes recycling methods viable, since the recycled products have the same properties of the commercial material. This paper aims to evaluate the behavior of recycled gypsum plaster calcined at 100 °C, 150 °C and 200 °C. It was also studied the use an admixture (superplasticizer). Physical and mechanical properties were evaluated. The results showed that the dehydration temperature influences in both fresh and hardened gypsum properties. The temperature of 200 °C reported better values of initial and final setting times and compressive strength. Calcination at 150 °C showed higher values of hardness. The admixture utilization modified the initial and final setting times.

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Evaluation of the Recycled Gypsum Plaster Properties with Additives

10.19146/pibic-2015-36977 ◽

2015 ◽

Author(s):

Gladis Camarini ◽

Aline Goulart De Moura

Keyword(s):

Gypsum Plaster ◽

Recycled Gypsum

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Thermal Analysis of Recycled Gypsum from Construction and Demolition Waste

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.260-261.977 ◽

2012 ◽

Vol 260-261 ◽

pp. 977-980 ◽

Cited By ~ 9

Author(s):

Gladis Camarini ◽

Sayonara M.M. Pinheiro ◽

Katia Tannous

Keyword(s):

Thermal Analysis ◽

Thermal Properties ◽

Construction And Demolition Waste ◽

Recycling Process ◽

Demolition Waste ◽

Gypsum Plaster ◽

Recycled Gypsum ◽

Construction Works

Construction and demolition waste has in its composition gypsum plaster which is a soil and groundwater contaminating material. Some works have been developed to recyle this gypsum waste. The aim of this work is to show a thermal analysis of recycled plaster. The recycled plaster was produced through a recycling process consisting of grinding and burnig the gypsum waste. Physical and thermal properties (TGA/DTA) from both commercial and recycled gypsum plaster were analysed. The results show a recycled plaster with similarities with commercial plaster, showing the possibility to reuse this waste in construction works.

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