The production of high-quality recycled aggregates and sand can facilitate complete concrete recycling and hence significantly contribute to materials preservation, thus making concrete more sustainable.
It is desirable to use recycled concrete aggregates in concrete production as long as it is cheaper than natural aggregate and does not increase the demand for expensive …
This article presents a comprehensive review on the use of recycled concrete aggregate (RCA) and recycled aggregate concrete (RAC) in construction, with emphasis on …
Experimental program. Strength and durability properties of concrete made with recycled concrete aggregates (RCA) were studied by an experimental investigation. The variables considered in the study are water-cement ratio, cement content and percentage of replacement of coarse aggregate (CA).
Depending on their qualities, the recycled aggregate produced from C&D wastes can be employed in roads, drainage, construction projects, structural concrete and in the production of concrete products. An overview and summary of the current concrete recycling recovery data around the world is shown in Table 1.
At a certain moment, the relative humidity inside and outside the recycled aggregate reaches equilibrium, which is the maximum limit of water absorption of recycled aggregate in the mortar, and this maximum limit is much smaller than the saturated state of water absorption of recycled aggregate [ 43 ].
This paper presents the main results of the research carried out to obtain the fatigue limit of concrete incorporating recycled aggregate from concrete. In this research, recycled aggregate concretes with partial and total coarse aggregate replacement and control concretes with different increasing water/cement ratios have been cast to study …
This study investigated the mechanical behavior of normal strength (NS) and high strength (HS) concrete containing recycled fine aggregates (RFAs). A high slump mixing design was employed, which may be potentially used as filled structural concrete. The compressive strength, tensile strength, and elastic modulus were measured …
The use of recycled aggregate concrete can save natural resources and reduce environmental pollution, which has been widely concerned in recent years.…
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 …
The use of recycled aggregates (RA) for concrete production usually involves a reduction of the workability as measured by slump. This reduction is mainly due to higher absorption rates, rough-textured surfaces and particles with quite irregular shape from RA. Besides that, the slump test is a static test, whose result is influenced by its …
This study investigates the feasibility of utilizing recycled plastic waste as a partial substitute for sand in concrete production. Reprocessing used plastic items or materials involves collecting, cleaning, shredding, and melting, resulting in reprocessed plastic particles. Incorporating these recycled plastic particles into concrete addresses …
When recycled coarse aggregate is used in structural concrete, the assessment of physical, mechanical and durable characteristics of recycled coarse aggregate is very …
As a result, incorporating recycled aggregate (RA) in concrete production is a prudent course of action to reduce the environmental impact. This study reviews prior research on using recycled aggregate instead of conventional ingredients in concrete.
To study the compressive properties and environmental impact of recycled aggregate, large-scale indoor compression tests were carried out on recycled aggregate under different moisture contents, concrete aggregate ratios, dry-wet cycles, and loads.
The aim of the thesis was to research the water demand, consistency, and compression strength of recycled aggregate concrete made by using recycled concrete aggregates …
Different physical properties tests were performed on recycled aggregate to examine its consistency with specifications provided by Indian Standards. Compressive strength test on concrete with varied proportions of recycled aggregate were conducted and evaluated against natural aggregate. All tests were conducted in accordance with Indian ...
Use of recycled aggregate in concrete can be useful for environmental protection and economical terms. Recycled aggregates are the materials for the future.
Recycled concrete aggregates ( RAC concrete ), a form of crushed concrete aggregate, are an alternative to the use in concrete and aggregate of natural aggregates (NA).
It is desirable to use recycled concrete aggregates in concrete production as long as it is cheaper than natural aggregate and does not increase the demand for expensive constituents of concrete, particularly cement. In addition, by reducing the quarry of natural aggregate the costs for amenity and bio-diversity can be reduced [ 50 ].
Depleting aggregate resources and increasing construction waste can be offset by recycling and reuse of waste concrete. By using recycled concrete aggregate (RCA) as partial or full replacement of coarse aggregate in new construction can substantially reduce the stress on the latter.
Download scientific diagram | Recycled aggregate size distribution curve compared to the limits of NBE.FL 90 adapted to sieve size established by UNE-EN-933-2. from publication: Caracterización e ...
This study proposes the use of diatomaceous earth (DE) as a surface-treating agent for recycled aggregate (RA) to enhance the performance of recycled aggregate concrete (RAC). The treatment process involves pre-saturating the RA and applying a coating using a slurry composed of calcined DE and ordinary Portland cement at specific …
This paper investigates the feasibility of using recycled concrete aggregate (RCA) as a replacement to the natural aggregates (NAs) in hot mix asphalt (HMA). RCA was collected from two different sources (new concrete cubes used for quality control testing during construction, and old demolished building) to investigate the impact of …
With the popularization of recycled aggregate concrete, a lot of efforts have been performed to improve the reliability of RAC components, in which partial or full concrete confinement technology is considered to …
Recycled aggregates are the product of processing inert construction and demolition waste, asphalt planings and used railway ballasts into construction aggregates. Just as primary aggregates, these materials conform to European aggregate standards and national specifications, and make a key contribution to total aggregates demand.
This is an important test for recycled aggregates enabling the producer to categorise the aggregate's constituents according to defined descriptions and categories: e.g. A recycled aggregate having 55% concrete, 25% brick, 19% asphalt and ≤1% clay would have the categories Rc50, Rb30-, Ra20- and X1-. 8.
Pre-saturation can ensure consistency in the water-to-cement ratio. According to Behera, M et al. ... In terms of the ultimate limit state of steel anchors embedded in concrete, fib …
Upscaling the Use of Recycled Aggregate Concrete. This paper presents an overview of several aspects that can further upscale the use of recycled aggregate concrete. It presents the main steps that need to be followed to demolish existing barriers to the use of recycled aggregates, namely those related with; the creation of financial benefits ...
Experimental program. Strength and durability properties of concrete made with recycled concrete aggregates (RCA) were studied by an experimental investigation. The variables …
