Recycled aggregates from vertically demolished concrete structures (concrete buildings and bridges) are VRCAg. Those from horizontal demolished structures, e.g., …
Full-scale structures made with coarse recycled aggregates from crushed precast concrete elements. • Unprecedented study on the in situ performance of real structures in concrete with recycled aggregates.. In situ results and equivalent laboratory results agree to a great extent.
19.2.1 Recycled concrete aggregate (RCA). Coarse RCA complies to the requirements of maximum 5% masonry content, 5% fine materials, 0.5% lightweight material, 5% asphalt, 1% foreign material and 1% acid soluble sulfate, and is suitable for use in concrete as per BS 8500-2 (2006).In designated concrete RC20/25 to RC40/50, RCA can automatically …
This paper explores the feasibility of using recycled fine aggregate in concrete to meet strength requirements for various applications in sustainable construction. The physical and mechanical characteristics including: aggregate strength, gradation, absorption, specific gravity, shape and texture, play crucial roles in determining …
Recycled aggregate concrete structures are advocated widely as sustainable structures mainly due to numerous benefits of concrete recycling including reducing the need of natural resources extraction and landfill. Furthermore, the energy and carbon implications of recycled aggregate concrete in material level and low-rise …
Recycled concrete aggregates include recycled coarse aggregates (RCA, 5–31.5 mm) and recycled fine aggregates (RFA, 0.5–5 mm). Because of the adhered old mortar on the surface, RA tends to have inferior properties. ... Demolition waste from reinforced concrete or prestressed concrete structures made with medium- to high …
Performance of concrete made with aggregates recycled from precasting industry waste: influence of the crushing process. Materials and Structures. 2014 48:12 [Internet]. Springer; ... Materials and Structures. 1986. 19: 3 [Internet]. Springer; 1986 [cited 2022 May 16];19:201–46.
Mixes are more sustainable when recycled concrete aggregate (RCA) replaces natural aggregates, at least to a degree. A nalyzing Performance of RCA. ... Lafarge Holcim is a global building products producer doing business in more than 70 countries. ... Researchers continue to look for ways to expand the use of recycled …
Nano-SiO 2 and nano-TiO 2 particles were mixed into recycled aggregate concrete (RAC) to enhance its properties. Mercury intrusion porosimetry was used to test the pore structure of the mortar in RAC, and the rapid chloride migration instrument was selected to investigate the diffusivity of RAC. It is found that the addition of nanoparticle …
Concrete has been the rock star of modern architecture: it is strong, versatile, and durable, able to withstand natural and environmental disasters.However, it has a downside: it is highly contaminating, one of …
Drying shrinkage of concrete made from recycled aggregate is usually greater than concrete made using natural aggregate. the percentage of drying shrinkage soar if it is produced from recycled coarse and fine aggregate. ... base or fill for drainage structures; road construction; noise barriers and embankments; 2. Uses of Processed Crushed ...
As such, at present, the literature dealing with the impact assessment of recycled aggregate concrete structures is very extensive. Therefore, the objective of this article is to present a critical view of the state-of-the-art in terms of sustainability assessment of recycled aggregate concrete structures, taking a holistic perspective …
Firstly, the book presents key findings on the micro- and meso-structure of recycled aggregate concrete (RAC), while the second part focuses on the mechanical properties …
The model uncertainty, estimated from analogue specimens made with either natural aggregate concrete or recycled aggregate concrete, is compared and the incorporation of recycled aggregates was ...
The specific features of recycled aggregate concrete (RAC) mix proportioning methods affected by the recycled aggregate (RA) properties are …
AbstractThe present study illustrates the susceptibility of optimized-quality recycled concrete aggregate (RCA) to supplementary cementitious materials (SCMs), such as silica fume (SF), ground granulated blast slag (GGBS), and mechanically produced ...Practical ApplicationsAbout 20% to 30% of recycled fines (M-Fines) below …
However, the obtained decent relationship assures that this method can also be used for estimating the MOE of existing concrete structures, where taking out cores from the structural concrete elements is not preferred due to low concrete strength or minor dimensions of the elements. ... Strengths of recycled aggregate concrete made …
The use of recycled aggregate has been explored to lead to a sustainable future as it provides an alternative to traditional natural concrete. Experimental …
In this paper, a comprehensive literature review was conducted on the utilization of recycled concrete aggregate (RCA), which is the dominant construction …
The fabrication of conventional concrete, as well as remains from demolition, has a high environmental impact. This paper assessed the eco-efficiency of concrete made with uncarbonated recycled concrete aggregates (RCA) and fly ash (FA). Two concrete series were produced with an effective water/cement ratio of 0.50 (Series …
In this paper, a comprehensive literature review was conducted on the utilization of recycled concrete aggregate (RCA), which is the dominant construction and demolition waste material, in base and subbase layers and its comparison with natural aggregate (NA).
The use of recycled aggregate (RA) to produce recycled aggregate concrete (RAC) is a proven way of decreasing the consumption of natural aggregate (NA) and the …
Construction will often require demolition of existing buildings and structures built with hard and durable materials such as concrete and brick which can be recycled and re-used in new construction. Recycled …
The results of this experimental campaign are benchmarked with other investigations and the importance of the quality of the RA is evaluated. This paper concerns the first full-scale experiments made on recycled aggregates concrete structures. Also, some of the tests performed were the first of their type made on recycled aggregates …
The structures were designed by following Chinese building codes while optimizing the mix design of recycled aggregate concrete to achieve similar fresh and …
For structures that are to be made resilient against earthquakes, the use of recycled concrete is not recommended. ... Certainly, recycled-aggregate concrete only provides nominal strength even in compression and cannot target high strength or even ductility. Water-retaining structures such as dams, water reservoirs, tanks, etc. made of ...
Over the past decades, the performance of RA and recycled aggregates concrete (RAC) have been studied in detail by many researchers ... The D f peaked at 15% RP replacement rate, indicating that the incorporation of 15% RP made the microscopic pore structure of RAPC complex and hydration products abundant. Moverover, the pore …
Although the use of fRCA in structural concrete was reported to have positive environmental impact [38], studies have indicated several issues when using fRCA regarding fresh and hardened properties of new concrete.For example, high water absorption of fRCA may lower concrete workability; adhered mortar introduces more …
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 …
Recycled Concrete Aggregates: A Review. March 2013; International Journal of Concrete Structures and Materials 7(1) 7(1) DOI: ..., concrete specimens made with up to 30 % RCA had.
Using recycled aggregates from construction and demolition waste can preserve natural aggregate resources, reduce demand of landfill, and contribute to sustainable built environment. This study provides a comprehensive review on recycled aggregate (RA) and recycled aggregate concrete (RAC) regarding their history, …
This paper discusses the suitability of producing concrete with 100 % recycled aggregate to meet durability and strength requirements for different applications. Aggregate strength, gradation, absorption, specific gravity, shape and texture are some of the physical and mechanical characteristics that contribute to the strength and durability …
This article presents a comprehensive review on the use of recycled concrete aggregate (RCA) and recycled aggregate concrete (RAC) in construction, with emphasis on structural applications and identification of challenges and opportunities of …
The use of recycled aggregates in concrete opens a whole new range of possibilities in the reuse of materials in the building industry. The utilisation of recycled aggregates is a good solution to the problem of an excess of waste material, provided that the desired final product quality is reached. The studies on the use of recycled …
Download Citation | Recycled Aggregate Concrete Structures | This book describes how, given the global challenge of a shortage of natural resources in the 21st century, the recycling of waste ...
Only the chipping of concrete according to type 1 and type 2 (as defined in the above standard) can be used for concrete production. Type 1 RA can be associated to a RCA: it contains at least 90 % of concrete and natural aggregates, not more than 10 % of clinker, non-pored bricks, sand-lime bricks, less than 2 % of other mineral materials …
Thus, we prepared four different concretes, including natural aggregate concrete (NAC), recycled aggregate concrete (RAC), TRAC and fiber-reinforced tailings recycled aggregate concrete (TRAC-PP) series. PP fibers were used as supplementary material at different percentages (0.3%, 0.6%, 0.9% and 1.2%) and compared with NAC, …
Cyclic bond property of steel reinforced recycled concrete (SRRC) composite structure. Constr. Build. Mater., 245 (2020), Article 118435. ... Properties of concrete made with recycled aggregate from partially hydrated old concrete. Cem. Concr. Res., 33 (5) (2003), pp. 703-711. View PDF View article View in Scopus Google …
