Recycling of foundry by-products in the ceramic industry: Green and core sand in clay bricks

Alonso-Santurde, R.; Coz, Alberto; Viguri, Javier R.; Andrés, A.

doi:10.1016/j.conbuildmat.2011.08.022

Cited by 90 publications

(36 citation statements)

References 32 publications

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“…26,27 The ceramisation process is intensified with higher temperatures, and the melted materials partially fill the pores and produce a pore size reduction or even closure during firing. 12 The SEM observations confirm the increasing presence of a vitreous phase with the increasing maximum firing temperatures (Fig. 4a-c).…”

Section: Clay Bodies and Clay Ceramic Materialssupporting

confidence: 79%

Reusing coffee waste in manufacture of ceramics for construction

Fonseca

Vilão

Galhano

et al. 2013

Advances in Applied Ceramics

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This paper aims at studying the influence of different clay/coffee waste mixtures in structural ceramics by incorporating different amounts of spent coffee grounds as an additive. Clay paste with 5, 10, 15 and 20 wt-% of coffee waste was used to mould clay bodies, which were then fired at the temperatures of 900, 1000 and 1100uC. Morphological aspects were evaluated through SEM images, while several laboratory tests provide the physical and mechanical properties. Incorporation of coffee waste increases the water absorption and apparent porosity, and increasing the firing temperature causes an overall decrease in pore size. Samples with up to 10% coffee waste are in the highest grade of mechanical strength standards. The addition of 20% decreases by 70% the thermal conductivity value. The coffee waste residues could be used as a secondary clay raw material to form proper bricks with excellent thermal insulation proprieties.

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Section: Clay Bodies and Clay Ceramic Materialssupporting

confidence: 79%

Reusing coffee waste in manufacture of ceramics for construction

Fonseca

Vilão

Galhano

et al. 2013

Advances in Applied Ceramics

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“…When the sand can no longer be reused, it becomes a hazardous material according to European regulations as quoted by AlonsoSanturde et al [1], since it can contain heavy metals and different pollutants [2][3]. The usual fate of this sand -several MT per year -is to be landfilled after a previous process of solidification/stabilization.…”

Section: Introductionmentioning

confidence: 99%

A novel use of calcium aluminate cements for recycling waste foundry sand (WFS)

Navarro-Blasco

Fernández

Durán

et al. 2013

Construction and Building Materials

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The recycling of WFS in calcium aluminate cement mortars at high level of replacement (50%) was studied. Consistency and setting time were measured in fresh mortars. Two different curing conditions were used, the second one with the aim of enhancing the formation of stable cubic calcium aluminate hydrates. Compressive strength, pore size distribution and SEM examination were carried out to assess the effectiveness of CAC matrix in the recycling of WFS. The effect of the incorporation of a polymeric admixture -a chitosan derivative -was also explored. Leaching studies on hardened mortars of three target pollutants of the WFS (toxic metals Pb, Cr and Zn) were also done to evaluate their immobilization. By comparison with OPC mortars, the use of CAC showed several advantages, improving the compressive strength and the toxic metal retention.

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“…However, the water permeability of this type of bricks often decreases after a period in use because their pores are easily sealed by fine clay particles, and their weather resistance is weaken due to their softening during the rainy season [1,2]. Many studies have been performed on the effects of replacing the clay with sand or recovered materials such as melting slag, bottom ash, fly ash, steel slag, or sludge [3][4][5][6]. Bricks prepared with these types of raw materials exhibit a better water permeability and weather resistance [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Nepheline‐based water‐permeable bricks from coal gangue and aluminum hydroxide

et al. 2016

Env Prog and Sustain Energy

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Nepheline-based water-permeable bricks are prepared with coal gangue and aluminum hydroxide by raw material pretreating, mixing, isostatic molding, roasting, and self-curing. These bricks exhibit balance between their mechanical and water-permeable properties. In this study, two main factors, the raw material ratio and the molding pressure, are studied. The mineral phase, porous structure, and mechanical properties of the samples are characterized by X-ray diffraction, scanning electron microscopy and mercury injection, respectively. The compressive strength and water permeability of the bricks meet

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Recycling of foundry by-products in the ceramic industry: Green and core sand in clay bricks

Cited by 90 publications

References 32 publications

Reusing coffee waste in manufacture of ceramics for construction

Reusing coffee waste in manufacture of ceramics for construction

A novel use of calcium aluminate cements for recycling waste foundry sand (WFS)

Nepheline‐based water‐permeable bricks from coal gangue and aluminum hydroxide

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