New additions for eco-efficient cement design. Impact on calorimetric behaviour and comparison of test methods

Medina, César; Bosque, I.F. Sáez del; Asensio, Eloy; Frías, Moisés; Rojas, M.I. Sánchez de

doi:10.1617/s11527-016-0809-5

Cited by 22 publications

(16 citation statements)

References 45 publications

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“…The data showed lower maximum heat in the mortars containing granite quarry dust than in the reference: 5.5 % lower in OPC+10%AF and 19.3 % lower in OPC+20%AF. Similar behaviour has been reported for other pozzolanic materials included in new cements at similar replacement ratios, such as paper mill sludge [73], fly ash [74], fired clay-based sanitary ware [15] and milled ash [29].…”

Section: Heat Of Hydrationsupporting

confidence: 81%

“…That has left a large scientific-technical gap in the understanding of other properties associated with material durability, such as: i) indirect indicators of transport intensity (water absorption, capillarity and electrical resistivity) [12]; ii) volume change resulting from drying shrinkage or early-age swelling that may induce micro-or macrocracking, compromising service life [13]; iii) the alkali-silica reaction due to the simultaneous presence of moisture, reactive silica and cement-borne alkalis, forming silica gel and subsequently map-like cracking [14]; and iv) the heat released during hydration, possibly generating steep thermal gradients that may prompt cracking, a major concern in structures requiring large volumes of concrete such as dams [15].…”

Section: *Manuscript Click Here To View Linked Referencesmentioning

confidence: 99%

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Durability of new recycled granite quarry dust-bearing cements

Medina

Bosque

Frías

et al. 2018

Construction and Building Materials

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Imperative to the design of new cements that bear different types of waste as additions is a parallel study of the mechanical strength and durability of the new materials to ensure their performance will be satisfactory throughout their service life. This study explored the effect of adding 10 % or 20 % granite quarry dust to cement on properties such as transport (total and capillary water absorption and electrical resistivity), dimensional stability (drying shrinkage and expansion), the alkali-silica reaction, heat of hydration and colour. No alkali-silica reaction was observed in the new materials and expansion and contraction were less intense than in conventional cement. The water absorption and capillary absorption coefficients rose less in the additioned cements than the replacement ratio, whilst their higher resistivity values afforded greater corrosion protection than found in the reference. The inclusion of this waste also prompted a rise in lightness and a decline in peak heat of hydration. The multivariate analysis of variance (MANOVA) conducted showed that the factors time and replacement ratio affected the properties significantly, whereas the combined effect of the two was statistically significant or otherwise depending on the property analysed. The findings showed that the partial replacement of cement with quarry dust is not detrimental to product durability and the recycled material qualifies as a strength class 42.5, type II/A. Adittionally, the binders bearing 20 % granite quarry dust meet the requirements to qualify as low heat cements (CEM II/A LH).

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Section: Heat Of Hydrationsupporting

confidence: 81%

Section: *Manuscript Click Here To View Linked Referencesmentioning

confidence: 99%

Durability of new recycled granite quarry dust-bearing cements

Medina

Bosque

Frías

et al. 2018

Construction and Building Materials

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“…Fired clay industry waste is one of the new pozzolans explored by researchers. A number of prior studies on this material showed that fired clay of different origins has very promising pozzolanic properties because when fired at temperatures of 600°C‐900°C and ground to cement fineness, initially inert clay minerals acquire substantial pozzolanicity . The evaporation of chemically combined water at such temperatures and the resulting breakdown of the crystalline network of clay constituents induces the formation of an amorphous or vitreous material.…”

Section: Introductionmentioning

confidence: 99%

Use of ceramic industry milling and glazing waste as an active addition in cement

et al. 2017

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The beneficial effects of pozzolans on cement manufacture have encouraged their use in that industry. Traditional natural pozzolan have become less available of late, however, due to a decline in quarrying intensity aimed at minimizing the impact on the landscape. At the same time, environmental policies pursue the reduction or elimination of spoil heaps by valorizing industrial waste and by-products as raw materials, in keeping with the principles of the circular economy.The quest for new types of waste and by-products with pozzolanic properties has consequently become a priority line of research. This study explored the valorization of one such by-product, the ceramic sludge resulting from fired clay industry milling and glazing, as a component in new, more eco-sustainable cements. The sludge was characterized physically, chemically, morphologically, and mineralogically to determine its suitability as a pozzolanic addition in cement. The findings showed that ceramic sludge consists in clustered particles ranging in size from 100 lm to 1 lm. SiO 2 , Al 2 O 3 , and Fe 2 O 3 together comprise over 70% of the total composition, while the reactive silica content is greater than the 25% required by the existing legislation. The predominant minerals are quartz, kaolinite, and muscovite, with some zircon. A study of pozzolanic reaction kinetics in the ceramic sludge/lime system revealed that over time this waste can fix lime, generating products such as calcium aluminate hydrates and C-S-H gels. The cements made with ceramic sludge proved to be standard-compliant in terms of water demand, setting, drying shrinkage and mechanical strength. K E Y W O R D S cements, ceramic waste, pozzolanic activity, supplementary cementitious materials

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“…Por este motivo, el empleo de cementos con bajo contenido de Clinker, el uso de adiciones provenientes de desechos industriales y la incorporación de áridos reciclados, son acciones que permiten lograr sostenibilidad en la industria. (Medina et al, 2016;Sadiqul Islam et al, 2017).…”

Section: Introductionunclassified

Impresión 3D para la elaboración de arrecifes artificiales. Registro térmico másico

Yoris-Nobile

Positieri²,

Fernandez³

et al. 2020

AJEA

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En el presente trabajo, correspondiente a la tesis doctoral en curso, se muestra la elaboración de arrecifes artificiales mediante una impresora 3D tipo Delta y el uso de estructuras auxiliares, como pallets, cercos perimetrales y arena de relleno, para lograr imprimir las formas irregulares. Como material de impresión se utilizaron dos tipos de morteros de cemento, uno con arena caliza y otro con arena de vidrio triturado. En dichos morteros se empleó cemento de bajo contenido en Clinker, se incorporó fly ash como adición y se empleó árido reciclado, lo cual dotó a los moteros de sustentabilidad o bajo impacto ambiental. En los arrecifes artificiales seregistró la temperatura interna y de borde para conocer su evolución durante un período entorno a los 5 días. Estas determinaciones se realizaron en dos piezas de la misma forma y con distintos morteros, además se evaluó una pieza prismática maciza. Los resultados muestran que la metodología empleada para la elaboración de piezas irregulares fue adecuada, ya que el modelo digital de los arrecifes artificiales se pudo reproducir en forma fidedigna y no se registró asentamiento del mortero durante el proceso. En cuento a las temperaturas registradas, se observó un aumento de temperatura superior a los 50º C en el interior, y superior a 40º C en el borde, este comportamiento fue muy similar en ambos tipos de morteros y un poco superior en la pieza de control.

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New additions for eco-efficient cement design. Impact on calorimetric behaviour and comparison of test methods

Cited by 22 publications

References 45 publications

Durability of new recycled granite quarry dust-bearing cements

Durability of new recycled granite quarry dust-bearing cements

Use of ceramic industry milling and glazing waste as an active addition in cement

Impresión 3D para la elaboración de arrecifes artificiales. Registro térmico másico

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