Influence of processing parameters variation on the development of geopolymeric ceramic blocks with calcined kaolinite clay

Linhares, J. A. T.; Azevedo, Afonso Rangel Garcez de; Marvila, Markssuel Teixeira; Teixeira, Silvio Rainho; Федюк, Роман; Vieira, Carlos Maurício Fontes

doi:10.1016/j.cscm.2022.e00897

Cited by 11 publications

(4 citation statements)

References 23 publications

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“…GGBFS can be activated by alkaline materials (such as NaOH and CaO et al) to generate AAS. Compared with Portland cement (PC), AAS can reduce carbon emissions [ 7 ], as traditional alkaline activators (NaOH, Na 2 SiO 3 ) are expensive and have a great impact on the environment [ 8 , 9 ]. Ca(OH) 2 and CaO are potential alternatives to alkali activators because CaO (or Ca(OH) 2 )-activated slag cementitious materials can achieve high 28 d compressive strength [ 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Experiment on the Properties of Soda Residue-Activated Ground Granulated Blast Furnace Slag Mortars with Different Activators

Yao

et al. 2022

Materials

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Soda residue (SR), a solid waste generated in the production of Na2CO3 during the ammonia soda process, with a high pH value of 12, can be used as an activator of alkali-activated ground granulated blast furnace slag (GGBFS) cementitious materials. Three groups of experiments on SR-activated GGBFS mortars were designed in this paper to assess the role of the dominant parameters on fluidity and compressive strength of mortars. The results indicate that for fluidity and mechanical properties, the optimal scheme of SR-activated GGBFS mortars is 16:84–24:76 S/G, 0.01 NaOH/b, 0.05 CaO/b, and 0.50 w/b, with fluidity and compressive strength (28 d) of the mortars being 181–195 mm and 32.3–35.4 MPa, respectively. Between 2.5–10% CaCl2 addition to CaO (5%)-SR (24%)-activated GGBFS mortar is beneficial to the improvement of the compressive strength of C2, whereas the addition of CaSO4 is harmful. The main hydration products of mortars are ettringite, Friedel’s slat, and CSH gels. The results provide a theoretical basis and data support for the utilization of SR.

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Section: Introductionmentioning

confidence: 99%

Experiment on the Properties of Soda Residue-Activated Ground Granulated Blast Furnace Slag Mortars with Different Activators

Yao

et al. 2022

Materials

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“…As a result, it requires a higher activation energy to undergo the necessary structural changes during calcination, which can result in changes to its particle size and specific surface area. Linhares Jr. et al [24] stated that the calcination temperatures should be adjusted according to the degree of purity and crystallization of the clay, and they generally alternate between 500 and 800 • C.…”

Section: Introductionmentioning

confidence: 99%

Influence of Calcination Temperature and Amount of Low-Grade Clay Replacement on Mitigation of the Alkali–Silica Reaction

et al. 2023

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Results of experimental investigation on the mitigation of alkali–silica reaction (ASR) by low-grade calcined clay are presented. Domestic clay with an Al2O3 content equal to 26% and SiO2—58% was used. The calcination temperatures were as follows: 650 °C, 750 °C, 850 °C and 950 °C, which were chosen much more widely than presented in previous studies. Pozzolanity of the raw and calcined clay was determined with the Fratini test. The performance of calcined clay to mitigate ASR was evaluated according to ASTM C1567 using reactive aggregates. A control mortar mixture was prepared with 100% Portland cement (Na2Oeq = 1.12%) as a binder with reactive aggregate, and test mixtures were made with 10% and 20% of calcined clay as a cement replacement. The microstructure of the specimens was observed on the polished sections using scanning electron microscope (SEM) operated in backscattered mode (BSE). The results of expansion of mortar bars with reactive aggregate showed that replacing cement with calcined clay reduced the expansion of the mortar bars. The greater the cement replacement, the better results in terms of ASR mitigation. However, the influence of the calcination temperature was not as clear. The opposite trend was found with the use of 10% or 20% calcined clay.

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“…No entanto, durante o processo de cura dos sistemas epóxi, a produção de bolhas é um problema comum, Figura 1 [7]. A presença de vazios nos compósitos pode comprometer a sua qualidade, diminuir a resistência sua resistência mecânica, bem como elevar a sua permeabilidade e absorção de água [7,8].…”

Section: Introductionunclassified

Análise Do Uso De Aditivo Antibolhas Na Confecção De Compósitos Particulados De Matriz Epóxi

Velasco,

Lopes,

Loiola

et al. 2023

ABM Proceedings

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ResumoO uso de resíduos como fase dispersa em compósitos tem sido estudado para criar materiais sustentáveis e minimizar o desperdício de recursos. Para este fim, a resina epóxi tem sido amplamente utilizada na indústria devido às suas excelentes propriedades, mas a produção de bolhas durante o processo de cura pode comprometer a qualidade e resistência dos compósitos. A formação de bolhas durante o processo de cura da resina epóxi depende de vários fatores, podendo inclusive ser intensificada com a presença de resíduos. Para evitar esse problema, são usados aditivos. Assim, este estudo tem por objetivo avaliar o efeito do uso de aditivo de antibolhas na resistência à flexão de compósitos particulados de matriz epóxi. Diferentes formulações com e sem particulados orgânicos/inorgânicos foram avaliadas utilizando ou não agentes antibolhas. Os resultados indicaram que a resistência e o módulo de elasticidade não apresentaram diferenças significativas, mas sim em uma redução do desvio padrão. No entanto, a análise de Weibull mostrou que a redução do coeficiente de variação, juntamente com variações na resistência média, resultou em ganhos de confiabilidade na resistência à flexão de até 50%. Palavras-chave: Resíduos industriais; Compósitos particulados; Matriz epóxi; Aditivo antibolhas.

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Influence of processing parameters variation on the development of geopolymeric ceramic blocks with calcined kaolinite clay

Cited by 11 publications

References 23 publications

Experiment on the Properties of Soda Residue-Activated Ground Granulated Blast Furnace Slag Mortars with Different Activators

Experiment on the Properties of Soda Residue-Activated Ground Granulated Blast Furnace Slag Mortars with Different Activators

Influence of Calcination Temperature and Amount of Low-Grade Clay Replacement on Mitigation of the Alkali–Silica Reaction

Análise Do Uso De Aditivo Antibolhas Na Confecção De Compósitos Particulados De Matriz Epóxi

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