Recycling options for gypsum from construction and demolition waste

Vrancken, Karl C.; Laethem, B.

doi:10.1016/s0713-2743(00)80045-8

Cited by 17 publications

(10 citation statements)

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“…In addition to the studies that explored the dynamics of the building material stocks for a wide range of building materials, a few studies have been able to quantify the recycling potential of these building materials. Most of these studies focused on the recycling of a single material or material type, ranging from glass [25], gypsum [26], and concrete [27] to metals [28].…”

Section: Building Materials Stock Dynamics and Reuse Potentialmentioning

confidence: 99%

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Matching Demolition and Construction Material Flows, an Urban Mining Case Study

Verhagen

Sauer²,

Voet

et al. 2021

Sustainability

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The recycling of demolition waste is essential to lower the construction sectors primary material demand, responsible for 50% of the global primary material consumption. Almost all demolition waste is used as filler material for the construction of roads, preventing further reuse or recycling after this application. The built environment generates considerable annual material in-and outflows. However, there has been little discussion on the availability and further application of this potential supply of secondary materials as a replacement for primary materials. In this study, we quantify the percentage of demolition waste that can be repurposed as secondary materials in the Dutch construction sector. We analyzed the yearly building material flows for the municipality of Leiden using municipal data on demolition and construction to explore the viability of the Dutch government’s policy goal to reduce primary materials consumption by 50% before 2030. From this analysis, we find that the recycling of demolition waste has a sizable potential but just falls short of the stated policy goal. Even in a situation with more construction than demolition, there will remain a considerable mismatch in the yearly construction material demand and available supply of demolition waste for our municipal-wide case study. More importantly, the current processing of demolition waste in the Netherlands will require significant improvements to achieve this goal. New governmental policies are required to focus on maintaining material quality and allowing further use of recycled materials as buildings materials.

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Section: Building Materials Stock Dynamics and Reuse Potentialmentioning

confidence: 99%

“…Concrete 85% [31] 50% [32] Clay brick 95% [31] 50% [33] Wood 95% [31] 90% [34] Glass 95% [31] 91% [25] Ceramic 95% [31] 80% [31] Gypsum 95% [31] 40% [26,35] Bitumen 50% [31] 50% [33] Steel 95% [31] 85% [36] Cast iron 95% [31] 96% [36] Aluminium 95% [31] 50% [37] 2.4.…”

Section: Materials Eol Collection Rate (%) Recycled Content Potentialmentioning

confidence: 99%

Matching Demolition and Construction Material Flows, an Urban Mining Case Study

Verhagen

Sauer²,

Voet

et al. 2021

Sustainability

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“…Gypsum is often associated with recycled construction materials in Belgium [47]. In our case, even if gypsum was not detected, it could be initially present in the backfill within the recycled construction materials.…”

Section: Mineralogical Analysismentioning

confidence: 53%

Understanding Groundwater Mineralization Changes of a Belgian Chalky Aquifer in the Presence of 1,1,1-Trichloroethane Degradation Reactions

Boudjana

Brouyère

Jamin

et al. 2019

Water

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An abandoned industrial site in Belgium, located in the catchment of a chalk aquifer mainly used for drinking water, has been investigated for groundwater pollution due to a mixture of chlorinated solvents with mainly 1,1,1-trichloroethane (1,1,1-TCA) at high concentrations. The observed elevated groundwater mineralization was partly explained by chemical reactions associated with hydrolysis and dehydrohalogenation (HY/DH) of 1,1,1-TCA in the chalky aquifer. Leaching of soluble compounds from a backfilled layer located in the site could also have influenced the groundwater composition. In this context, the objective of this study was to investigate the hydrochemical processes controlling groundwater mineralization through a characterization of the backfill and groundwater chemical composition. This is essential in the context of required site remediation to define appropriate remediation measures to soil and groundwater. Groundwater samples were collected for chemical analyses of chlorinated aliphatic hydrocarbons, major ions, and several minor ones. X-Ray Diffraction Analysis (XRD), Scanning Electron Microscopy (SEM) and a leaching test according to CEN/TS 14405 norm were carried out on the backfill soil. δ34S and δ18O of sulphate in groundwater and in the backfill eluates were also compared. Both effects influencing the groundwater hydrochemistry around the site were clarified. First, calcite dissolution under the 1,1,1-TCA degradation reactions results in a water mineralization increase. It was assessed by geochemical batch simulations based on observed data. Second, sulphate and calcium released from the backfill have reached the groundwater. The leaching test provided an estimation of the minimal released quantities.

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“…Devido à sua solubilidade, a sua baixa dureza e a baixa densidade, tem efeito negativo na qualidade do agregado. Estas propriedades impedem o uso de concretos que contenham gesso como material para uso em fundação ou em aplicações associadas ao cimento, pois um excesso de sulfatos poderia gerar reações que provoquem expansão com redução na resistência do concreto e consequente deterioração do material [25]. Porém Godinho-Castro et al [26] complementa esta informação sugerindo que a incorporação de resíduos de gesso na produção de blocos cerâmicos em até 20%, seria viável sem causar impacto técnico adverso (ou seja, mudança na qualidade do produto) e impacto ambiental.…”

Section: Durabilidade Do Concreto Com Agregado Recicladounclassified

Influência do agregado reciclado na durabilidade do concreto: uma revisão da bibliografia

Krüger¹,

Pereira²,

Chinelatto

2017

Simpósio Paranaense De Patologia Das Construções

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Resumo: No Brasil, as edificações são concebidas para durar muitos anos, porém devido à falta de manutenção, aumento da demanda populacional ou mudanças nas características urbanas onde está inserida, sua vida útil muitas vezes é reduzida. Tendo em vista que os recursos naturais não são renováveis e que novas edificações demandam geração de agregados para sua produção, uma proposta que já vem sendo estudada é a utilização destes resíduos de construções e demolições transformados em agregados reciclados para construção. O presente artigo apresenta uma conceituação sobre a propriedade de durabilidade do concreto, correlacionando-a com as características dos agregados constituintes. De forma análoga, está apontado através de diversos estudos, como estas características influenciam diferenciadamente os agregados reciclados. Observa-se que conhecendo o comportamento apresentado pelos agregados reciclados, é possível fazer o monitoramento adequado do gerenciamento e beneficiamento deste material. Ao se controlar as características do RCD, consequentemente aumenta-se o controle das propriedades do concreto com ele confeccionado. Conclui-se então após esta revisão da literatura que a produção de concretos com boa durabilidade é um objetivo tangível.Palavras-chave: durabilidade, concreto, agregado reciclado, RCD.Abstract: In Brazil, buildings are designed to last for many years. However, due to lack of maintenance, increased population demand or changes in the urban characteristics where they are inserted, their service life is often reduced. Since natural resources are not renewable and new buildings require generation of aggregates for their production, a proposal that has already been studied is the use of these construction and demolition waste transformed into recycled aggregates for construction. This article presents a conceptualization on the concrete durability property, correlating it with the characteristics of its constituent aggregates. In an analogous way, it points out through several studies, how these characteristics influence the recycled aggregates in different ways. It is observed that knowing the behavior presented by the recycled aggregates, it is possible monitor in a proper way the management and processing of this material. When the CDW characteristics are controlled, consequently an increase in the control of the properties of the concrete made with it is obtained. The conclusion of this literature review is that the production of concrete with good durability is a tangible objective. 254 | P á g i n a KRUGER, P.; PEREIRA, E.; CHINELATTO, A. S. A., INFLUÊNCIA DO AGREGADO RECICLADO NA DURABILIDADE DO CONCRETO: UMA REVISÃO DA BIBLIOGRAFIA. 2º Simpósio Paranaense de Patologia das Construções (2º SPPC), artigo

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Recycling options for gypsum from construction and demolition waste

Cited by 17 publications

References 0 publications

Matching Demolition and Construction Material Flows, an Urban Mining Case Study

Matching Demolition and Construction Material Flows, an Urban Mining Case Study

Understanding Groundwater Mineralization Changes of a Belgian Chalky Aquifer in the Presence of 1,1,1-Trichloroethane Degradation Reactions

Influência do agregado reciclado na durabilidade do concreto: uma revisão da bibliografia

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