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From the studies conducted by Tam [2], Muzenda [5] and Benjamin [20], it could be inferred that about 850,500 to 1,360,800 tonnes of waste concrete are generated every year in South Africa.During interviews, it was determined that a local recycling plant has a production or processing capacity of 120,000 tonnes of waste concrete per year.
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Influence of amount of recycled coarse aggregates and production process on properties of recycled aggregate concrete. Cement Concr. Res., 37 (5) (2007), pp. 735-742, 10.1016/j.cemconres.2007.02.002. View PDF View article View in Scopus Google Scholar. Evangelista and de Brito, 2007.
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Recycled Aggregates are used as partially or fully as substitution of coarse and fine aggregates in recycled aggregate concrete. Though, recycled aggregate concrete is used for low level ...
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Construction and demolition activities consume large amounts of natural resources, generating 4.5 bi tons of solid waste/year, called construction and demolition waste (C&DW) and other wastes, such as ceramic, polyethylene terephthalate (PET), glass, and slag. Furthermore, around 32 bi tons of natural aggregate (NA) are extracted …
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DOI: 10.1016/j.conbuildmat.2019.117978 Corpus ID: 213535023; An evaluation of the recycled aggregate characteristics and the recycled aggregate concrete mechanical properties @article{Bai2020AnEO, title={An evaluation of the recycled aggregate characteristics and the recycled aggregate concrete mechanical …
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Primary aggregates are produced from natural sources extracted from quarries and sand & gravel pits and in some countries from sea-dredged materials (marine aggregates).; Secondary aggregates are recycled aggregates derive from reprocessing materials previously used in construction, including construction, demolition residues and by …
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In 2020, recycled aggregates made up 25% of the total aggregate supply in the UK so we think it's important everyone understands the basic process in how they are produced. The Recycled Aggregate Production …
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The research work described in this paper was conducted in three stages in order to analyse the applicability of recycled fine aggregates in the production of CLSM using air-entraining admixture. Stage 1 consisted in defining the optimum mix proportion of conventional CLSM made with Portland cement, water, air entrained admixture and …
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A literature review comprising 163 publications published over a period of 26 years from 1992 to 2018 is presented in this paper. This review discusses the generation and recycling of construction and demolition waste (CDW) as well as its main uses as raw materials for the construction engineering sector. This review pays attention to the use …
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After demolition of old roads and buildings, the removed concrete is often considered worthless and disposed of as demolition waste. By collecting the used concrete and breaking it up, recycled concrete aggregate (RCA) is created (Fig. 1).This paper focuses on coarse RCA which is the coarse aggregate from the original concrete that is …
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Construction of a new highway across Morocco is placing high demands for aggregates along the route and Agregat Oued Cherrat is work to supply the project. …
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In the current century, urbanization and the development of the construction industry have led to the generation of construction and demolition waste (CDW), imposing pressure on ecology and the environment. This has attracted the attention of industry personnel and researchers. This work discusses the current research on recycled …
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The concrete chosen for these tests is an old building in the region of Rabat, Morocco which has been built more than 40 years and demolished in the year of 2017. …
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Recycled Aggregates Recycled Concrete Aggregate (RCA) Crushed sound and clean waste concrete of at least 95% by weight of concrete with typical total contamination lower than 1% of the bulk mass. Class 1A RCA is a well graded RCA with no more than 0.5% brick content. Partial replacement (30%) for natural aggregate in concrete for sidewalks,
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Xing et al. showcased that recycled aggregate concrete exhibits the least environmental impact among the three concrete types with identical mix designs [52]. ... Accelerated carbonation of recycled concrete aggregates and its implications for the production of recycling concrete. Journal of Building Engineering, 79 (2023), Article …
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This paper investigates the use of carbon-conditioned recycled aggregate (RA CO2) in concrete production.Experimental work is conducted for RA CO2 with varying chamber pressure (0 kPa, 75 kPa, 150 kPa), chamber duration (0 min, 30 min, 90 min) and RA CO2 replacement percentages (0%, 30%, ) for concrete production. Average …
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The good news about the future of Morocco's MSW management is that the World Bank has allocated $271.3 million to the Moroccan government to develop a municipal waste management plan. The plan's details include restoring around 80 landfill sites, improving trash pickup services, and increasing recycling by 20%.
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This article provides a comprehensive review on recycled aggregate (RA) and recycled aggregate concrete (RAC) regarding their history, recycling, reuse, properties, and applications. It also discusses the challenges and future perspectives of …
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Recycled concrete aggregates (RCA) are used in existing green building composites to promote the environmental preservation of natural coarse aggregates (NCA). Besides, the use of RCA leads to potential solutions to the social and economic problems caused by concrete waste. It is found that insufficient information on the …
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This study investigates the potential of incorporating recycled fine aggregates (RFA) into sustainable concrete. In this research, a conventional compaction technique is utilized to establish the order of compressive strength and, consequently, to assess particle packing density in terms of weight within a specific cylindrical volume …
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Aggregate Production and Recycling SePcagets i39o-59n. Building a water storage reservoir in Mohammedia, Morocco, and crushing the material to 0/40mm with the Rockster impactor R1100D.
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Within the scope of the study, CEM I 42.5 R Ordinary Portland cement (OPC) was used as the binder phase of the mixtures. As the aggregate phase, natural aggregates (NA) and recycled concrete aggregates (RCA) were used. RCAs were obtained from crushing and sieving of concrete wastes (CW) that collected separately …
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Crushing treatment of the demolished concrete into recycled concrete aggregates (RCAs), and preparing recycled aggregate concrete (RAC) with these …
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In Morocco, recycled aggregates, does not have any specific standards, and is used mainly in roads and pavements construction. ... regulations such as source sorting of waste and selective demolition could potentially optimize recycled aggregate production. Also, the adhered mortar was found to govern the properties of the recycled concrete ...
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In Morocco, recycled aggregates, does not have any specific standards, and is used mainly in roads and pavements construction.
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An attributional life cycle assessment has been developed in agreement with the ISO standards (ISO 14040, 2006a, ISO 14044, 2006b).The goal of the study includes: (a) to draw up a regional LCI for natural aggregate (NA) and mixed recycled aggregate (MixRA) production in Brazil, based on primary data collect in a stationary …
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Using recycled concrete aggregates (RCA) for pavements is crucial to achieving sustainability. Implementing RCA for new pavement can minimize carbon …
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Furthermore, around 32 bi tons of natural aggregate (NA) are extracted annually. In this scenario, replacing NA with recycled aggregate (RA) from C&DW and …
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The aim of this study is to improve the sustainability of cement and concrete mixes. To do so, the fine recycled aggregates (FRA) from construction and demolition wastes (CDW) were used in cement raw meals (CRM) to produce recycled clinker and cement to be used in the mix design of new concretes. About 7000 tons of clinker …
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1. Introduction. Concrete is by far the most widely used construction material around the world. The annual world concrete production varies depending on the source between 13 billion [2] and 21 billion tons [95].Dixit et al. [21] pointed out that 49% of raw stone, gravel and sand, 25% of wood and 16% of water are consumed by the …
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