Recycling of waste recycled aggregate concrete in freeze …
It is an inevitable trend to recycle and use construction waste. Recycled aggregate concrete (RAC) has been widely studied and put into use. However, it is an important issue to improve the utilization rate and sustainability of waste concrete that how to use RAC for generations and apply it in a durable environment (freezing and thawing, carbonation, …
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Surface reinforcement of recycled aggregates (RAs) by …
The results indicated that the production of one ton of recycled coarse aggregates reduces CO 2 eq Greenhouse gas by approximately 66.6 % and lowers PM 2.5 eq emissions by approximately 40 %, compared to one ton of natural coarse aggregates. In China, huge amounts of buildings that were mainly built with clay brick in the last …
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Use of recycled aggregate concrete in structural …
The size of the coarse aggregate has an impact on how much mortar adheres to it, whilst the type of crusher used and the manufacturing process have an impact on the form and texture of …
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Experimental study on recycled coarse aggregate of concrete
Crushing hardened concrete is a lot like crushing natural rock, and the grade or quality of the original concrete doesn't make a big difference [5].You can expect recycled concrete aggregate made from all but the worst original concrete to pass the same tests that are done on regular aggregates [4].
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Prediction of properties of recycled aggregate concrete …
Compared with coarse natural aggregate (CNA), using recycled aggregate from CDW can reduce greenhouse gas emissions by 65 % and save 58 % of non …
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Prediction of mechanical properties of recycled aggregate …
This paper investigates the mechanical properties of concrete containing recycled aggregates and fly ash as a sustainable and eco-friendly solution for construction, which can reduce the demand for natural aggregates and cement, conserves natural resources, and curtails greenhouse gas emissions.Machine learning …
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Surface reinforcement of recycled aggregates (RAs) by …
The quality of the RAs directly affects the mechanical properties and durability of the concrete since the aggregate accounts for 70–75 % of the concrete volume [14].In recent years, pre-treated recycled aggregates (PRA) to improve the quality of RAs has become a hot topic [15].The reinforcement methods of RAs are summarized in …
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A novel approach for optimizing the processing of recycled coarse
C & D waste aggregates are primarily used in the sub-base layer of road and embankment constructions. The rationale for not employing recycled coarse aggregate (RCA) for structural purposes is that, its properties are inferior to natural aggregate (NA) [10].The main disadvantage of RCA is that it has a lower specific gravity and absorbs …
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Use of recycled coarse aggregate for M40 grade concrete
Decreasing natural resources of coarse & fine aggregates and growing issues with trash management assistance the beneficiation of trash materials. The quality and uniformity of the recycled aggregate and the concrete generated from it are clearly influenced by the degree of processing and the original concrete's quality, according to …
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Recycled Concrete Aggregates: A Review | International …
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 …
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Research on crushing and recycling of waste concrete
The particles with a size less than 4.75 mm after crushing are called recycled fine aggregate, an artificial aggregate with a complex composition and high permeability generally used to prepare ...
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Effect of Crushing Method on the Properties of …
Mechanical crushing can be performed with different types of crushers according to a survey conducted in the SeRaMCo project ; the most used equipment for C&DW recycling are the impact, jaw and …
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Characterization of sustainable mortar containing high-quality recycled …
Wide application of recycled coarse aggregate has been achieved in ready-mixed concrete, self-compacting concrete and high-performance concrete; and the replacing rate of high-quality recycled coarse aggregate in concrete can reach [29, 30].However, for the use of RFA, it is universally restricted in high-quality mortar and …
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Crushing Value Test for Coarse Aggregates. (a) …
The main objective of this work is to obtain a 5–10 mm aggregate fraction of RCA and RAP, to obtain an appropriate recycled coarse aggregate for manufacturing hot mix asphalt (HMA).
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Study on the stress–strain full curve of recycled coarse aggregate
After crushing and screening, construction waste can be made into recycled aggregate [1], [2], including recycled fine aggregate (RFA) [3] and recycled coarse aggregate (RCA) [4]. Recycled coarse aggregate concrete (RCAC) can be made by replacing natural coarse aggregate (NCA) with RCA [5]. The global protection of the …
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Recycling of Concrete (Recycling Coarse Aggregate)
Coarse Aggregate: The Coarse aggregate was used as Recycled coarse aggregate (RCA). The specific gravity of the RCA was 2.30. The Fineness modulus was 3.67 Fine Aggregate: Natural river sand was used as fine aggregate. The Specific gravity of Fine aggregate was 2.68. B. Methods
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Experimental study on recycled coarse aggregate of concrete
For making recycled coarse aggregate, concrete from a nearby site was used in a testing machine and then by hand with hammers. The broken aggregates are then put through 20 mm, 16 mm, 10 mm, and 4.75 mm sieves, and the aggregates that stay in the 16 mm, 10 mm, and 4.75 mm sieves are used as recycled coarse …
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Role of coarse recycled aggregate in concrete beams
Several studies have attempted to add coarse recycled aggregate (CRA) to transversely-unreinforced concrete beams that have been tested for shear capability in order to meet sustainability goals. ... CRA crushed using a custom-made jaw crusher machine, which can produce adjustable discharges of sizes 10–40 mm with a capacity …
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Improving recycled coarse aggregate (RCA) and recycled coarse aggregate
C&D wastes were collected from Suzhou, China. The constituents were measured according to BS EN933-11:2009 [32]. 20 kg of the RCA was sampled uniformly from the C&D wastes pile, and particles passing the 4 mm sieve were recorded and removed.The reminding sample was immersed in the water, and floating particles were …
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Crushing Value Test for Coarse Aggregates. (a) apparatus …
The main objective of this work is to obtain a 5–10 mm aggregate fraction of RCA and RAP, to obtain an appropriate recycled coarse aggregate for manufacturing hot mix asphalt (HMA).
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Effects of recycled fine aggregates on properties of …
Effects of recycled fine aggregates on properties of concrete containing natural or recycled coarse aggregates: A comparative study. Author links open overlay panel Rahul Singh a, Dheeresh Nayak a ... (Fig. 2 b) because of the size limitation of the jaw crusher machine. The jaw crusher was used for crushing original concrete (Fig. …
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Crushing and Screening Equipment for Concrete …
The jaw crusher is a primary crushing machine that reduces the size of large chunks of concrete into smaller pieces. Jaw crusher. A jaw crusher works by compressing the material between two …
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Aggregate Crushing Plant | Aggregate Crushing Machine
The secondary screening divides the crushed aggregate into 5-20mm high-quality recycled aggregates, which can be used for C25-C30 concrete manufacturing, and the tertiary screening selects 0.15mm-5mm high-quality recycled fine aggregates and 0.15mm Fine powder below mm.
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Evaluation on the Surface-Modified Recycled Coarse Aggregate …
The pretreated recycled aggregate is then used in the replacement of natural coarse aggregate at various substitution levels (0%, 30%, 50%, 70%, and ), and the effects of these replacements on the mechanical and durability aspects of concrete are explored. ... The crushing resistance of coarse aggregate is a paramount factor in …
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Application of recycled coarse aggregate by mixture to …
The authors have developed a production method for recycled concrete that is different from that of the draft. The recycled coarse aggregate is produced by a simple …
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Tensile Behavior of Green Concrete Made of Fine/Coarse Recycled …
The study conducted axial tensile strength tests on concrete samples that replaced conventional aggregates with recycled aggregates. In Series I, using FNG instead of FNA resulted in a reduction in compressive strength by 12.8–49.8% and tensile strength by 14.5–44.6%. If the proportion of FNG exceeds 50%, compressive strength …
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Recycled Aggregate Concrete | PPT
10. How to produce recycle aggregate concrete Crushing and screening systems start with primary jaws, cones and/or large impactor taking rubble from 30 inches to 4 feet. A secondary cone or impactor may or may not need to be run, and then primary and secondary screens may or may not be used, depending upon the project, the …
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Recycled Aggregates
The maximum particle size of NCA of continuous grading is 31.5 mm. The RCA is crushed from the demolished concrete airport pavement. Because of the long age of this airport pavement, technical factors, such as strength grade and the mixture of waste concrete, remain unknown. RCA are …
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Effect of nano-SiO2 modified recycled coarse aggregate on …
Improving the performance of the interface between old mortar and recycled coarse aggregate (RCA) is a hot topic and important to enhance the properties of recycled aggregate concrete (RAC). In this paper, the RCA was soaked by nano-SiO 2 (NS-RCA) then the water absorption and crushing index of NS-RCA were investigated. The …
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Modification of Recycled Concrete Aggregate and Its Use in …
J. Xiao gave the particle size ratios of recycled coarse aggregate with a particle size of 16~31.5 mm and natural coarse aggregate with a particle size of 5~31.5 mm, as shown in Figure 2. It can be seen that the ratio of each particle size of recycled coarse aggregate is different from that of natural coarse aggregate.
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New Mix Design Method for Recycled Concrete Using Mixed …
The coarse recycled aggregate was used as a replacement for natural limestone aggregate. The concrete has a single target strength grade of C30. For each cubic meter, 1158 kg of the weight of CRCA, 424 kg of cement, 623 kg of river sand, 195 kg of water, and a constant water-to-cement ratio (W/C) of 0.46 were used in all …
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Carbonated recycled coarse aggregate and uniaxial compressive stress
Carbonation treatment was employed to improve the quality of recycled coarse aggregate (RCA), and the RCA or carbonated RCA (CRCA) was used to prepare recycled aggregate concrete (RAC or RAC-C). The influence of the RCA replacement rate and CRCA on the mechanical properties and stress-strain relation of concrete was …
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Experimental Study of Mechanical Properties and Theoretical …
With diminishing natural aggregate resources and increasing environmental protection efforts, the use of recycled fine aggregate is a more sustainable approach, although challenges persist in achieving comparable mechanical properties. Exploration into the incorporation of steel fibers with recycled aggregate has led to the development of …
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Effect of Crushing Method on the Properties of …
Construction and Demolition Waste (C&DW) is generated around the world and its quantity will increase in the future. Recycling has become the favored method of dealing with concrete waste but, to avoid …
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Influence of amount of recycled coarse aggregates and production
1. Introduction. 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 …
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Compressive strength of concrete with recycled aggregate; a machine …
A concrete mixture available in the literature (Poon et al., 2004) is chosen and natural fine aggregate, natural coarse aggregate and both natural fine and coarse aggregate are replaced with recycled fine aggregate, recycled coarse aggregate and recycled fine and coarse aggregate, respectively in a range of 0–90% with the step of …
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Recycled Plastics as Coarse Aggregate for Structural Concrete
Seeking aggregates for concrete and to dispose of the waste from various commodities is the present concern. Today sustainability has got top priority in construction industry. In the present study the recycled plastics were used to prepare the coarse aggregates thereby providing a sustainable option to deal with the plastic waste [10].
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