boost the use of recycled aggregates and to provide Society with examples of how recycled aggregate concrete is a sound and safe material. The report also presents measures tailored to different contexts that could tackle the main barriers; these range
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Recycled concrete aggregate differs from natural aggregate in that it is mainly composed of two materials, namely, the original aggregate and adhered mortar [4], [5]. However, it often contains impurities, such as crushed clay brick, crushed ceramic materials, and gypsum contributing to the existence of contaminants, for example chlorides ...
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Moreover, when recycled aggregates are combined with recycled cement, the carbon footprint of concrete can be significantly reduced. The reduced need for cement …
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Teranishi K, Dosho Y, Narikawa M, Kikuchi M. Application of recycled aggregate concrete for structural concrete. Part 3 – Production of recycled aggregate by real-scale plant and quality of recycled aggregate concrete. sustainable construction, use of recycled concrete aggregate; November 1998. p. 143–56.
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MG method involves placing RCAs in a concrete mixer and separating the aggregates from the old mortar through collisions and ball milling (Bru et al., 2014; Dimiu et al., 2018; Shi et al., 2016).Old mortar could be effectively removed from the surface of RCAs via the MG method, enhancing the properties of RAC by satisfying the required specifications at a …
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Title: Durability of Recycled Aggregate Concrete Author(s): Nariman J. Khalil and Georges Aouad Publication: Symposium Paper Volume: 336 Issue: Appears on pages(s): 91-100 Keywords: recycled aggregates, durability, mechanical properties, absorption, sulfate attack DOI: 10.14359/51722458 Date: 12/11/2019 Abstract: The results of an experimental investigation …
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2. Research on the mechanical and physical properties of RAC. The integration of Recycled Concrete Aggregates (RCAs) is expected to raise the moisture absorption capability of concrete, with the rate of increase directly correlating with the RCA content (Correia, de Brito, and Pereira Citation 2006; Dhir et al. Citation 1999; Dodds et al. Citation 2017; Ferreira, De Brito, …
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This monograph addresses the use of recycled concrete aggregates (RCA) as a replacement for natural aggregates (NA) in concrete applications.
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Decades of research have been dedicated to recycled aggregates, but future efforts should prioritize enhancing the reactivity of inert recycled concrete powder, enabling it to …
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A novel aggregate (RPA) comprising recycled plastic was developed. The aggregate produced was lightweight, with a density ranging from 510 to 750k kg/m³ and absorption of from 2.7 to 9.81%.
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Bibliometrics analysis of concrete containing recycled aggregate for the years 2013–2022. From the point of view of the construction materials studied, it is observed that the most common are ...
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The widespread use of this material has led to continuous developments such as ultra-high strength concrete and self-compacting concrete. Recycled Aggregate in Concrete: Use of Industrial, Construction and Demolition Waste focuses on the recent development which the use of various types of recycled waste materials as aggregate in the production ...
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Structural concrete aggregate can be substituted with sustainable alternatives from construction and demolition waste, such as reclaimed asphalt pavement (RAP). This contribution assesses the RAP aggregate production chain and aims to investigate the economic aspect of RAP aggregate, evaluating the costs associated with its production and comparing …
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This study provides a comprehensive review on recycled aggregate (RA) and recycled aggregate concrete (RAC) regarding their history, recycling, reuse and manufacture …
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Considering on the current difficulties of predicting the compressive strength of recycled aggregate concrete, this paper proposes a prediction model based on deep learning theory. First, the deep features of water-cement ratio, recycled coarse aggregate replacement ratio, recycled fine aggregate replacement ratio, fly ash replacement ratio as ...
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To obtain good quality concrete using recycled aggregate it is necessary to follow the minimum requirements defined by the BCSJ [1], RILEM [2], DIN 4226.100 [3], and prEN 13242:2002 [4].Acceptable properties of aggregates are an elemental base for concrete quality, however adequate mix proportions and concrete production methods are highly important in …
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Recycled concrete aggregates (RCAs) produced from concrete wastes are estimated to cost less than natural aggregates (NAs). Tam [7] investigated the economical considerations of recycling concrete waste.It was reported that the long-term net benefit of producing coarse recycled concrete aggregate (CRCA) from waste concrete was positive with …
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Concrete recycling to produce aggregates is crucial in reducing the demand for materials in the construction industry, particularly for the most widely used building material—concrete. A potential solution to enhance the quality of recycled aggregates involves the removal of the adhered cement paste from their surfaces. In this study, samples of industrial …
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Currently, a number of disadvantages hampers the use of recycled concrete aggregates (RCA). The current review proves that concretes made with complete replacement of natural aggregate with RCA allow the production of high-quality concrete. One of the possibilities for improving concrete properties with RCA is the use of extended curing and pozzolanic …
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In recent years, the reuse of recycled concrete aggregate (RCA) in cementitious materials has garnered significant interest [6].Currently, natural aggregates dominate cement-based composites, comprising up to 60–75 % [7].However, the extensive expansion of global infrastructure projects has resulted in a depletion of natural aggregates, leaving civil …
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This includes its use in the construction industry, and more particularly in concrete, which uses large quantities of aggregate. A novel aggregate (RPA) comprising recycled plastic was developed. The aggregate produced was lightweight, with a density ranging from 510 to 750 k kg / m 3 and absorption of from 2.7 to 9.81%. Other properties were ...
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The recycling of locally collected concrete waste is being promoted toward reducing the carbon footprint. In the preparation of concrete, recycled concrete aggregates (RCA) are encouraged instead ...
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Recycled aggregates and particularly, recycled concrete aggregate substantially affect the properties and mix design of concrete both at fresh and hardened states since it is known by high ...
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This descending strength with increasing the amount of recycled concrete aggregates (RCA) is reported in the literature [20]. The decrease in strength was more noticeable when the quantity of recycled aggregate exceeded 50%. The strength reduction was approximately 15% for 75% replacement of coarse aggregate. For RBA, strength is increased …
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History. Recycled concrete aggregates or Crushed concrete aggregates has been in use since the ancient times, only to be integrated with gravel, sand, and cement to ensure durability. The practice was first recorded in the 1860s. US construction companies were reluctant to use the technique at first since crushing cured concrete proved to be much more cost …
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He used recycled concrete aggregate mixed with ceramics and reclaimed asphalt material in his experiments, crushed limestone was used as a reference material. The authors found that recycled materials have a different behavior compared to natural materials, but in general, all the recycled materials tested showed an acceptable performance. ...
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Carbonation of concrete is a process which absorbs carbon dioxide (CO2). Recycled aggregate concrete (RAC) may own greater potential in CO2 uptake due to the faster carbonation rate than natural aggregate concrete (NAC). A quantitative model was employed to predict the CO2 uptake of RAC in this study. The carbonation of RAC and the specific surface …
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prouduction of recycled aggregate concrete | Crushers, prouduction of recycled aggregate concrete pdf, effects . the cement sustainability initiative introduction production process (cement is added to aggregates to make ... Go to Product Center
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In this scenario, replacing NA with recycled aggregate (RA) from C&DW and other wastes can mitigate environmental problems. We review the use of RA for concrete production and draw the main...
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1. Introduction. The construction industry has a significant environmental impact [1], concrete being the most commonly used material.According to the Global Cement and Concrete Association (GCCA) [2], in 2020, 14.0 billion m3 of concrete and 4.2 billion tons of cement were produced worldwide.In Spain, as OFICEMEN [3] and ANEHOP [4] stated 14.93 …
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There is a growing need to find ways to reuse fine concrete waste from the construction industry. In this study, recycled concrete fines were granulated and used as lightweight aggregates. Ladle slag, a steel industry residue, was used as a co-binder in different ratios (0, 10, 20, and 30%). The materials were blended and granulated, and then the granules …
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Compressive strength of RCA concrete can be influenced by the properties and amount of recycled aggregate. Several factors can influence the compressive strength in RCA concrete, including the water/cement (w/c) ratio, the percentage of coarse aggregate replaced with RCA, and the amount of adhered mortar on the …
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This article presents a structured and comprehensive review of the existing literature on physical, chemical, microstructure, and durability properties of recycled aggregate concrete (RAC). The engineering properties of concrete made from such recycled aggregates are critically analysed by focusing mainly on the fresh and hardened states along with several …
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