Geopolímeros basados en residuos de la producción de áridos ligeros

Soares, Paulo Roberto Ribeiro; Pinto, Amândio Teixeira; Ferreira, Victor; Labrincha, J.A.

doi:10.3989/mc.2008.v58.i291.105

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…It was further confirmed that the choice of the alkaline activator had a significant effect. This agreed with the results reported in a previous study [39], where clay powder burned at temperatures below 950 • C and combined with caustic soda NaOH or slaked lime Ca(OH) 2 was shown to have binding properties. The introduction of alkaline activators, such as sodium hydroxide in these residues, improves the mechanical stabilization of the soil by raising the pH.…”

Section: Discussionsupporting

confidence: 93%

Laboratory Evaluation of Finely Milled Brick Debris as a Soil Stabilizer

2019

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Brick is one of the most common building materials, and it is also one of the largest components of waste generated from both construction and demolition. Reuse of this waste would reduce the environmental and social impacts of construction. One potential bulk use of such waste is as a cementing agent for soil stabilization. However, this is currently limited by the need to mill the residue to a particle size below 0.035 mm. In this study, the behavior of two soil types stabilized using alkali-activated brick dust was investigated. The unconfined compression strength at different curing temperatures and moistures and the use of different types and concentrations of alkaline activators were investigated. It was found that the addition of brick dust resulted in an increase in the soil strength between 1.7-2.3 times with respect to the non-stabilized material, suggesting that the resulting materials will find practical applications in construction.

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Section: Discussionsupporting

confidence: 93%

Laboratory Evaluation of Finely Milled Brick Debris as a Soil Stabilizer

2019

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“…These binders result from the chemical interaction between strongly alkaline solutions and a material with high content of amorphous aluminosilicates (fly ash, blast furnace slag, sugarcane bagasse ash, copper slag, construction and demolition waste, among others) [ 7 ]. These new materials, in addition to having excellent mechanical performance, even at short ages, present reduced permeability, chemical and thermal stability, thus constituting high performance materials [ 13 ]. According to McLellan et al [ 14 ] and Yang et al [ 15 ], alkaline-activated or geopolymer cements can have similar environmental problems during their life cycle to those of Portland cement in terms of CO 2 emissions and energy requirements; however, according to Tempest et al [ 16 ] most of the emissions from alkaline activation systems can be attributed to the activator solutions due to the energy consumption associated with their production [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Cements and Construction Elements Based on Alkaline Activation with Sodium Sulfates from Fly Ash and Construction and Demolition Waste

Valencia-Saavedra,

Robayo-Salazar,

Mejía de Gutiérrez

2023

Materials

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This article demonstrates the possibility of producing hybrid cementitious materials (pastes, mortars, concretes, and precast elements) based on fly ash (FA) and construction and demolition wastes (CDW) using alkaline activation technology. Sodium sulfate was used as an activator and fine and coarse aggregates were obtained from CDW residues. An addition of Portland cement (OPC) (10 to 30%) allowed for improvement in the mechanical behavior of the hybrid cements and them to be cured at room temperature (25 °C). The FA and CDW cementitious materials obtained compressive strengths of 37 MPa and 32 MPa, respectively. The compressive strength of FA and CDW alkali-activated concretes at 28 days of curing was 22 MPa and 18 MPa, respectively, which identifies them as structural concretes according to NSR-10 title C in Colombia. The potential use of these concretes was validated by obtaining and classifying precast materials.

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“…se ha demostrado, que un material con esas características es posible conseguirlo, aplicando caolín ya que este presenta una relación siO2/al2O3 de 1.2 aplicada por varios autores, definiendo con esto a la geopolimerización como cadenas de aluminio-silicato en las cuales el número de moléculas de silicato pueden variar siendo estas: 1 molécula de silicio polisialato, 2 moléculas de silicio polisialato siloxo, 3 moléculas de silicio polisialato disiloxo todas estas con relación a una molécula de aluminio estabilizadas por unión de un metal alcalino (Davidovits, 1994). estas cadenas se forman por co-polimerización del aluminio y especies de silicato que proceden de la disolución de la alúmina y silicio presente en la constitución química de los materiales en un medio alcalino (P. Soares, 2007) Considerando que el ecuador es rico en arcillas, la primera parte del estudio consistiría en encontrar la química del activador aplicando matrices experimentales tipo 2 k y mediante análisis mineralógicos buscar una relación siO2/al2O3 de alguna arcilla cerámica similar o superior al caolín para llevar a cabo la polimerización.…”

Section: Introductionunclassified

ESTUDIO INICIAl DE GEO-POlÍMEROS A PARTIR DE ARCILLAS

Ordonez

Fajardo

2015

revfue

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*a quien debe dirigirse la correspondencia ResUMeN el presente artículo describe un estudio inicial de la generación de geo-polímeros asociando comparativamente la reacción geopolimérica del caolín referida por varios autores y una arcilla cerámica local. Los geo-polímeros materiales aglomerantes que en un futuro podrían sustituir a materiales tradicionales de construcción como: cemento, bloque entre otros con un bajo impacto ambiental en su producción y uso, además de tener mayor resistencia mecánica y química.Los análisis de fl uorescencia y difractometría de RX del caolín y de la arcilla cerámica permitió conocer las similitudes tanto químicas como mineralogías de las materias primas, se partió del caolín con una relación siO2/ Al2O3 de 1.2 para verifi car las concentraciones químicas del activador generando una matriz experimental con los iones de na+1, K+1, al+3, si-2 en un medio alcalino. La reactividad entre los iones alcalinos y el ion silicato demostraron iniciar la reacción de geo-polimerización tanto en el caolín como en la arcilla cerámica considerando que la relación siO2/al2O3 de la arcilla es de 1.78. Las briquetas de prueba se desarrollaron con ambas materias primas que fueron tratadas con solución la activadora desarrollada en la primera parte del estudio. Los ensayos dieron como resultados briquetas resistentes al agua con 5 horas de curado y una resistencia de hasta 32 megas pascales en los ensayos de compresión.Palabras clave: Geo-polimerización, activación alcalina, cemento alternativo. Initial study of geopolymers made from clays aBsTRaCTthis article describes an initial study of the generation of geo-polymers associating comparatively reaction geopolimérica kaolin reported by several authors and a local ceramic clay. the geo-polymer binder material in the future could replace traditional building materials such as cement, block and others with low environmental impact in their production and use, in addition to greater mechanical and chemical resistance.The fl uorescence analysis and diffractometry RX kaolin and ceramic clay yielded information both chemical similarities and mineralogy of raw materials, broke kaolin with a siO2 / al2O3 ratio of 1.2 to verify chemical concentrations activator generating a matrix with experimental ions Na + 1, K + 1, Al + 3, Si-2 in an alkaline medium. the reactivity between the alkali ions and silicate ion showed start geo-polymerization reaction both kaolin clay and pottery whereas the siO2 / al2O3 ratio is 1.78 clay. Briquettes test is developed with both raw materials that were treated with the activating solution developed in the fi rst part of the study. The tests gave results as briquettes waterproof 5 hours of curing and resistance up to 32 megabytes in pascals compression tests.

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Geopolímeros basados en residuos de la producción de áridos ligeros

Abstract: La geopolimerización es una manera viable para procesar y agregar valor a los residuos industriales de alumino-silicato dando lugar a materiales con elevadas resistencias mecánmicas, alta inercia química y que permiten encapsular otros residuos, incluso peligrosos.

Cited by 4 publications

References 6 publications

Laboratory Evaluation of Finely Milled Brick Debris as a Soil Stabilizer

Laboratory Evaluation of Finely Milled Brick Debris as a Soil Stabilizer

Hybrid Cements and Construction Elements Based on Alkaline Activation with Sodium Sulfates from Fly Ash and Construction and Demolition Waste

ESTUDIO INICIAl DE GEO-POlÍMEROS A PARTIR DE ARCILLAS

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