Handbook of recycled concrete and demolition waste

Pacheco-Torgal, F.; Tam, Vivian Wing Yan; Labrincha, J.A.; Ding, Yining; Brito, Jorge de

doi:10.1533/9780857096906

Cited by 117 publications

(67 citation statements)

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“…In the United Kingdom, more than 50% of waste deposited in a typical landfill comes from construction [3][4][5], while about 70 million tons of waste arise from construction and demolition activities [6]. In Australia, about 17 million tons of waste are put into landfills each year and about 42% of waste is attributed to the construction industry [7,8] (Productivity Commission 2006, Udawatta et al 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Table 1. The composition of construction and demolition waste generated in Australia, by sources and types of material [4,11]. The treatment of municipal waste in Australia, compared with selected Organisation for Economic Cooperation and Development (OECD) countries, is shown in Table 2.…”

Section: Introductionmentioning

confidence: 99%

“…Table 2. The treatment of municipal waste in Australia and selected Organisation for Economic Cooperation and Development (OECD) countries [4,11].…”

Section: Introductionmentioning

confidence: 99%

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Practitioners Recycling Attitude and Behaviour in the Australian Construction Industry

et al. 2018

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Construction waste management and recycling is widely discussed. However, at present there is still a significant amount of waste generated during the construction process. Considering this fact, this research aims to analyse the recycling attitudes and behaviours in the Australian construction industry. This paper investigates attitudes and behaviour towards recycling habits in construction; understands how recycling is viewed and carried out by practitioners in the industry; explains the causes of these states of mind; and formulates techniques that could be utilized to improve waste management and recycling acceptance within the industry and improve its effectiveness. Initially, the required data was collected through a questionnaire survey. Afterwards, a statistical analysis was carried out using SPSS software. It was found that the practitioners' attitude towards recycling habits are positive; however, their behaviour is not as strong as it should be. This means that the industry is aware and concerned about recycling in construction and willing to improve the environment by developing recycling habits. Recommendations to improve attitudes and behaviour towards recycling habits are also suggested, such as legislation and market driven developments, improvements of waste management methods, provisions in work method statements, sharing research and applications in sub-industries and developing communication.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Practitioners Recycling Attitude and Behaviour in the Australian Construction Industry

et al. 2018

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“…Construction and demolition waste (CDW) has been used significantly since World War II due of the great amount of debris and the need to satisfy the great demand for construction materials [1,2]. The use of CDW as aggregate for the development of concrete has been an alternative to reduce environmental and economic impacts through the preservation of natural resources, because the global demand for construction quality aggregates is expected to be more than 51 billion metric tons by 2019 [3].…”

Section: Introductionmentioning

confidence: 99%

Characterization and Use of Construction and Demolition Waste from South of Brazil in the Production of Foamed Concrete Blocks

et al. 2017

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Featured Application: The use of construction and demolition waste (CDW) in the development of building materials has been done constantly. The CDW from Passo Fundo region of Rio Grande do Sul/Brazil can be used in development of foamed concrete fully replacing the natural sand. Abstract:The main objective of this study was to evaluate the use of construction and demolition waste (CDW) from the Passo Fundo region of Rio Grande do Sul (RS), Brazil, in the development of aerated foamed concrete. This waste had not yet been characterized or even reused. CDW was processed (sieved only), characterized, and used as an aggregate, completely substituting natural sand. The influence of CDW granulometry and the amount of foam upon compressive strength, wet and dry bulk density, water absorption, and the air voids of concrete blocks were determined. Results showed that CDW has regular characteristics for the development of aerated foamed concrete. Compressive strength and density decreased as the amount of foam increased, while water absorption and air voids also increased. Also, CDW that was classified as coarse showed higher compressive strength. On average, CDW medium-sized particles had a higher air void content, while water absorption showed little variation with respect to granulometry. CDW residue from the region of study can be used as aggregate for the development of aerated foamed concrete. However, it must characterized before being used to guarantee the quality of the final product.

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“…According to the revised Waste Framework Directive (WFD), the minimum recycling percentage of non-hazardous CDW should be at least 70% by weight by 2020 [2]. End of life concrete is known to be the heaviest component of the CDW.…”

Section: Introductionmentioning

confidence: 99%

Recycling of End of Life Concrete Fines into Hardened Cement and Clean Sand

Lotfi¹,

Rem²

2016

JEP

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One of the massive by-products of concrete to concrete recycling is the crushed concrete fines, that is often 0 -4mm. Although the construction sector is to some extent familiar with the utilization of the recycled coarse fraction (>4 mm), at present there is no high-quality application for fines due to its moisturized and contaminated nature. Here we present an effective recycling process on lab scale to separate the cementitious powder from the sandy part in the crushed concrete fines and deliver attractive products with the minimum amount of contaminants. For this study, a lab scale Heating-Air classification system was designed and constructed. A combination of heat and air classification, resulted in a proper separation of finer fraction (0 -0.250 mm), from coarser fractions. Heating of the materials was followed by ball milling to enhance the liberation of the cementitious fraction. Experiments were carried out at different heating temperatures and milling durations. Experimental results show that by heating the materials to 500˚C for 30 seconds, the required time of ball milling is diminished by a factor of three and the quality of the recycling products satisfies well the market demand. In addition, the removal of contaminants is complete at 500˚C. The amount of CaO in the recovered finer fraction from the recycling process is comparable with the amount of CaO in low-quality limestone. By using this fraction in the cement kiln as the replacement of limestone, the release of the chemically bound CO2 could be reduced by a factor of three.

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Handbook of recycled concrete and demolition waste

Cited by 117 publications

References 0 publications

Practitioners Recycling Attitude and Behaviour in the Australian Construction Industry

Practitioners Recycling Attitude and Behaviour in the Australian Construction Industry

Characterization and Use of Construction and Demolition Waste from South of Brazil in the Production of Foamed Concrete Blocks

Recycling of End of Life Concrete Fines into Hardened Cement and Clean Sand

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