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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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 building sector. The huge concrete …
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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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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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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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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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Recycled Concrete Aggregate (RCA) adalah agregat kasar yang didapatkan dari limbah beton yang tidak terpakai kemudian dihancurkan kembali dan digunakan sebagai agregat kasar pada campuran beton ...
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Research into the properties of recycled aggregates (RAs) has been the focus for over 40 years [4], but due to undesirable results, such as high-water absorption and poor workability of concrete the industry was discouraged from counting on RA as an alternative.The investigations were largely limited to the manufacturing of non-structural grade recycled …
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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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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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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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The crushed concrete can be used as aggregates, termed as recycled-aggregate concrete (RAC). The recycled aggregate scan be used as a fill or foundation material. Recycled concrete can be used to build base for new asphalt pavements, outdoor surfaces, landscaping works, as bed foundation material for trenches. Recycled aggregates can also be ...
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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 review examines the impact of recycled aggregates (RAs) on the fresh and mechanical properties of high-strength concrete (HSC). The results revealed that incorporating RAs can reduce the compressive strength of HSC by up to 25%, with strength values ranging from 40 to 70 MPa depending on the RA content. The addition of supplementary materials like …
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Ammon Katz, (2003) "Properties of concrete made with recycled aggregate from partially hydrated old concrete", Cement and Concrete Research, 33, 703 – 711. Katz, A. (2004) "Treatments for the improvement of recycled aggregate", Journal of Materials in Civil Engineering-ASCE, 16(6), 597.
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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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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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However, for recycled aggregate concrete, the RM of RCA exhibits a high absorption potential which can exceed 5% (Beauchemin et al., 2018). And the water absorption of mortar made by RCA can reach up to 10% (Le et al., 2016). Due to high water absorption of RCA, the effective water/cement ratio of the recycled concrete could be significantly ...
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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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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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RA can be derived from existing concrete, and thus, termed as recycled concrete aggregate (RCA). According to de Vries (1996), the application of RCA in construction works …
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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 ...
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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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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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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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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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Requirement for coarse recycled concrete aggregate (RCA) as per BS8500 Importance of Recycling Aggregates for Concrete. Recycled aggregates are collected from CDW (Construction and demolition waste) as the amount of …
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Recycled aggregates are produced from CDW and their use in new concrete reduces the consumption of natural aggregates, a mineral resource. Moderate incorporation ratios of recycled aggregates are ...
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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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The present paper discusses the various possible recycled aggregates used in concrete production, their effect on both fresh and hardened properties as well as durability performances.
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