Gypsum plaster using rock waste: A proposal to repair the renderings of historical buildings in Brazil

Marvila, Markssuel Teixeira; Azevedo, Afonso Rangel Garcez de; Barroso, Laimara da Silva; Barbosa, Márcio Zago; Brito, Jorge de

doi:10.1016/j.conbuildmat.2020.118786

Cited by 62 publications

(32 citation statements)

References 28 publications

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“…It is noteworthy that although the results of the adherence test have a high error bar, the values obtained are consistent since the pull-off test procedure induces very dispersed values, as highlighted by other published scientific works. 24,26,28,72,73 Figure 8 shows the results of electrical resistivity for cementitious ceramics. It appears that the composition containing only clay has a high resistivity value, around 330 Ω*m, while the reference composition, which indicates a resistivity considered normal for this type of material, presents resistivity in the order of 180 Ω*m, which is almost half value.…”

Section: Hardened State Resultsmentioning

confidence: 99%

“…The ceramics were produced through the cement hydration reaction using a composition 1:1:6:1.5 (cement:lime:sand:water). This composition of mortar containing cement and hydrated lime, applied for wall covering and laying of masonry blocks, is common in South American countries, such as Brazil, Argentina, Colombia, and Chile, [27][28][29] in European countries, such as Portugal, Spain, Greece, and Italy, [30][31][32][33] and in Asian countries like China and Malaysia. 34,35 For that reason, was chosen to carry out this work.…”

Section: Methodsmentioning

confidence: 99%

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Circular economy in cementitious ceramics: Replacement of hydrated lime with a stoichiometric balanced combination of clay and marble waste

Marvila¹,

Azevedo

Alexandre³

et al. 2020

Int J Applied Ceramic Tech

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Cementitious ceramics, produced from the hydration of cement and hydrated lime, are responsible for a great deal of damage to the environment due to the high emission of CO 2 that occurs in the production of cement and lime. Therefore, the objective of this work was to substitute the hydrated lime with a combination of clay residue and marble waste extracted from ceramic and ornamental rock producing industries, respectively, which constitutes a circular economy for the ceramic industry related to masonry applications. Ceramics were produced in the proportion 1:1:6:1.5 (cement:lime:sand:water), through the molding procedure, and were studied by replacing hydrated lime with 100% clay residue and 100% marble residue, in addition to stoichiometric calculated parts of marble to clay. The molar ratios used were 1:1, 1:2, and 2:1 (marble:clay). Tests of consistency, incorporated air content, water retention, compression strength, density, water absorption by capillarity, adhesion, and electrical resistivity were performed. The results obtained demonstrate that the use of residue of marble and clay together, as long as they are correctly balanced, provides a high gain in technological properties, enabling the circular economy of cementitious ceramics, mainly for the composition 1 marble:1clay, which presented the best properties, both in the fresh and hardened state. The economic analysis carried out proved the financial gains for the industrial sectors involved (civil construction, ornamental rock, and ceramic).

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Section: Hardened State Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Circular economy in cementitious ceramics: Replacement of hydrated lime with a stoichiometric balanced combination of clay and marble waste

Marvila¹,

Azevedo

Alexandre³

et al. 2020

Int J Applied Ceramic Tech

Self Cite

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“…This was due to the fact that the active composites of fly ash were activated by a sulfate attack and formed into plenty of expansive products which reduced the porosity and improved the microstructure of the mortar; so, the sulfate attack had a positive effect on the performance of the mortar specimens. Moreover, the filling effect of fly ash can also improve the microstructure of mortar which was proved by Reference [37]. Macroscopically, it expresses as the increase of compressive and flexural strength of mortar.…”

Section: Effects Of Admixture and Erosion Age On Strength Of Mortar Amentioning

confidence: 88%

“…Plenty of other studies also showed that nano-silica replacement in the production of cement-based materials results in outstanding performance in terms of improved mechanical properties and durability [36]. In addition, Marvila et al [37][38][39] carried out many works on mortar such as preparation of gypsum plaster mortar, eco-friendly mortars, and paper mortar. Although a larger number of the existing achievements regarding influence of partial replacement of cement by admixtures on the mortars' performance were carried out [40], the coupled effects of concentration of sulfate solution, types and contents of admixtures, erosion age and form on the microstructure and mechanical property have not been discussed in detail.…”

Section: Introductionmentioning

confidence: 99%

Effects of Erosion Form and Admixture on Cement Mortar Performances Exposed to Sulfate Environment

Liu

Chen

2020

Crystals

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The effects of the admixtures, erosion age, concentration of sulfate solution, and erosion form of sulfate attack on the mechanical properties of mortar were investigated. Simultaneously, the microstructure, pore characteristics, kinds and morphologies of erosion products of mortar before and after sulfate attacks were performed by Mercury Intrusion Porosimetry (MIP), Environment Scanning Electronic Microscope and Energy Dispersive Spectrometer (ESEM-EDS). In addition, the crystal form and morphology characteristics of crystallization on mortar surfaces attacked by partial immersion form were studied. The results showed that the compressive and flexural strengths of mortar attacked by sulfate for four months decreased with the increase of the replacement of cement with fly ash, and the corresponding strength of mortar containing slag first increased and then decreased. The admixtures can improve the microstructure and mechanical properties of mortar within the replacement ratio of 10%. Although the change laws of the mortar specimens containing different admixtures were similar, the mortar containing slag had an excellent sulfate resistance under the same condition. Compared with the complete immersion form, the strength variation of the mortar containing fly ash attacked by semi-immersion form was less. The porosity and average pore diameter of mortar attacked by sulfate for four months increased, and the percentage of micropore with the pore diameter less than 200 nm increased. Plenty of rod-like and plate-like erosion products were generated in mortar attacked by a sulfate solution with a high concentration. A larger number of fibrous and flocculent crystallization covered the mortar’s surface containing fly ash, but it was a granular and dense crystallization formed on the mortar’s surface containing slag. Much dendritic erosion product was generated in the mortar attacked by semi-immersion form, and ESEM-EDS analysis revealed that it may be scawtite, spurrite, and residue of the decomposed calcium silicate hydrate (CSH) in the inner mortar; however, the crystallization sodium sulfate was crystallized on mortar surface.

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“…The most classic or trivial application for plaster is in the construction industry, where a material with an expressive purity content is not strictly required as discussed in the research work carried out by Marvila et al (2020), where the feasibility of using a plaster coating was analyzed, in historic buildings in a city of the state of Rio de Janeiro, containing residues of differents rock materials as a way of reducing the accumulation of solid urban waste. Another example of successful application in civil construction, which also does not require composition with an expressive degree of purity, is the case of the work developed by Buggakupta et al…”

Section: X-ray Fluorescencementioning

confidence: 99%

Investigative study of the potentialities of noble applications for the Brazilian calcium sulfate α-hemihydrate

Lira

Neiva

2020

PECEN

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O sulfato de cálcio hemiidratado (comercialmente conhecido como gesso) é obtido através da desidratação parcial do minério gipsita. A depender das condições termodinâmicas de calcinação do minério podem ser obtidas diferentes variações do hemihidrato. O objetivo deste trabalho é realizar um estudo investigativo acerca das possibilidades de aplicações nobres para o hemihidrato tipo α. Para isto, foi analisada uma amostra do gesso α proveniente do estado de Pernambuco, Brasil, por meio de técnicas de caracterizações estruturais e químicas. De acordo com os resultados, a amostra apresentou composição majoritariamente a base de sulfato de cálcio associado à água, com teor de pureza superior a 98,70%. As partículas apresentaram tamanho médio, aproximadamente uniforme, em torno de 60µm. A concentração insignificante de contaminantes detectados na amostra torna o hemihidrato α adequado para aplicações nobres como, por exemplo, na área da saúde dentre outras aplicações que impliquem em contato literal com o corpo humano.Palavras chave: α-Hemihidrato de sulfato de cálcio, gesso alfa, investigação de potencialidades, caracterizações estruturais.

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Gypsum plaster using rock waste: A proposal to repair the renderings of historical buildings in Brazil

Cited by 62 publications

References 28 publications

Circular economy in cementitious ceramics: Replacement of hydrated lime with a stoichiometric balanced combination of clay and marble waste

Circular economy in cementitious ceramics: Replacement of hydrated lime with a stoichiometric balanced combination of clay and marble waste

Effects of Erosion Form and Admixture on Cement Mortar Performances Exposed to Sulfate Environment

Investigative study of the potentialities of noble applications for the Brazilian calcium sulfate α-hemihydrate

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