In the current century, urbanization and the development of the construction industry have led to the generation of construction and demolition waste (CDW), imposing pressure on ecology and the environment. This has attracted the attention of industry personnel and researchers. This work discusses the current research on recycled …
Recycled coarse aggregate (RCA) made from waste concrete is not a suitable structural material as it has high absorption of cement mortar, which adheres on the aggregate surface and on the tiny cracks thereon. Therefore, when using RCA made from waste concrete, much water must be added with the concrete, and slump loss occurs …
The construction sector must incorporate the circular economy to improve sustainability and efficiency. The use of recycled aggregates (RAs) as a substitute for natural aggregates (NAs) is currently being investigated and is expected to yield considerable benefits in the future. The objective of this research is to evaluate the …
Open-loop systems are the least ideal form of recycling as it ends the continuing recycling process. However, if the glass waste is not colour sorted or the quality is compromised, other forms of glass recycling often cannot proceed. ... Terro [49] found that replacements of coarse aggregate up to 10% (by volume) can produce …
To sum up, recycling coarse aggregate is a complicated process and its influence on concrete differs depending on the research. Therefore, percentage of replacement of NA with RCA should be supported by the fulfilment of the assumed concrete strength requirements.
Recycled coarse aggregate used in the concrete preparation was obtained from the tested laboratory concrete specimens. Tests were carried out to obtain the mechanical properties of RCA such as compressive strength and durability of concrete using rapid chloride …
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 …
recycling process are jaw crusher, impact crusher, gyratory crusher, magnate sepa-rator, and sieve (Rao et al.2019). The procedure followed in India is explained in the subsequent section. 2.2 Extraction of Recycled Coarse Aggregate Recycling of waste concrete involves several manual as well as mechanical steps
Abstract This study proposes a new mix design method for C30 recycled concrete using recycled aggregate crushed from different strength source concrete (SC). The dosages of cement, water, sand, and coarse recycled concrete aggregate (CRCA) are the same as the corresponding components in natural concrete, but the CRCA should …
In this research, experimental work was conducted to validate the efficiency of Ceramic Waste Powder (CWP), Ceramic Fine Aggregate (CFA) and Recycled Coarse Aggregate (RCA) as a replacement for cement, Natural Fine Aggregate (NFA) and …
Recycling of Concrete (Recycling Coarse Aggregate) - written by Vinod Kumar Kumawat, Brijesh Kumar, Mayank Kumar Mehra published on 2018/04/24 download full article with reference data and citations. ... Recycling of concrete is a simple process. It involves breaking, removing, and crushing existing concrete into a material with a …
2.4 Coarse Aggregate The coarse aggregate used for the experimental work is both natural and recycled aggregate. In this study, graded 20 mm and 10 mm crushed granite coarse aggregate was used as the natural coarse aggregate. Table 2: Properties of Fine Aggregate and Coarse Aggregate Type Specific Gravity Water Absorption (%)
Recycling CDW into recycled concrete aggregates (RCA) is a way to reduce simultaneously the amount of waste and consumption of natural mineral resources.
This paper presents guidelines for using recycled-concrete aggregate (RCA) as a full or partial replacement for natural coarse aggregate in new concrete (RCA concrete). Several international standa...
Recycled aggregate (RA) made from waste concrete has inferior fundamental properties, i.e., apparent density, water absorption, mass variation, carbonation ratio, etc., compared to those of natural aggregate (NA), severely restricting its application in practical projects. However, using CO2 to accelerate RA carbonation can …
Objectives x To identify that e-waste can be disposed by using them as construction material. x Replacement of e-waste as coarse aggregate. x To limit the amount of toxic substances in certain electronic product. x To develop and improve the technology for e-waste management. x To reduce the pollution due to recycling of e …
The recycled aggregate obtained from demolished concrete was angular, with a higher water absorption rate and higher specific gravity than natural coarse aggregate, and usually higher compressive ...
The process of multiple recycling of stone coarse ag gregates ... This paper evaluates the influence of the use of agate waste as coarse aggregate in the compressive strength and the cement ...
Recycled concrete aggregates are produced in stationary recycling plants similar to those used for natural crushed aggregate production. Processing usually includes two-stage crushing (primary with jaw crushers and secondary with impact crushers), removing the …
Download scientific diagram | Aggregate Recycling process from publication: Cost-Benefit Analysis of Using Recycled Coarse Aggregate In Plain and Fiber Reinforced Concrete | The tendency of ...
This result also indicated that Level 1 crushing did not affect the integrity of the recycled coarse aggregate. When the recycling process was extended to Level 3, OCA particles regained some part of the cracks. A small increase in the ITZ cracks was also observed in the recycled coarse aggregate originated from the low-quality source …
Mixing and specimen preparation. Table 2 displays the quantities of each element, namely cement, fine aggregate, coarse aggregate, and recycled coarse aggregate. Moreover, Table 2 accurately computed the optimal blend ratios for casting each design, using the specified amounts of constituents in cubic meters. The concrete …
The quality level of the recycled material used significantly impacts the concrete created with recycled coarse aggregate (RCA). The concrete cylinders that were analyzed and crushed during prior laboratory research studies are used to generate the …
Fine and coarse river aggregate; fine and coarse crushed stone aggregate-RA: Coarse recycled concrete aggregate-Faleschini et al. (2016) NA: High quality/low quality (gravel/sand) Quarry: RA: High quality/low quality: CDW recycling plant: Hossain et al. (2016) NA: River sand/crushed stone-RA: CDW/waste glass-Braga et al. …
It also reduces Carbon Dioxide emission by 23%-28% as the cement can also be retrieved from the recycling process. Therefore the emission of CO2 in the production of new cement is less than before. ... Here the recovered aggregate contains coarse aggregate and coarse sand. Fine sands are settled down from suspension and …
The RCA is composed of coarse recycled concrete aggregate (CRCA) and fine recycled concrete aggregate (FRCA). The CRCA is a small concrete component made up of old coarse aggregate, mortar, and interfacial transition zone (ITZ), whereas the FRCA (>5 mm) is made up of crushed and sieved waste concrete mortar fragments.
This study presents a liberation process for recycling high-quality coarse aggregates from waste concrete by impacting with steel grits. Considering the mortar liberation ratio and specific energy ...
This study presents a liberation process for recycling high-quality coarse aggregates from waste concrete by impacting with steel grits.
Therefore, in the present literature review, different topics are addressed, such as characterization of CDW, the recycling process, the influence of coarse recycled aggregates in concrete, and different methods to strengthen the material.
By using this technique, the quality of the coarse aggregate separated and collected from concrete test specimens is comparable to that of coarse aggregate recycled by heating and grinding methods, thus satisfying the criteria in Japan Industrial Standard (JIS) A 5021 for the oven-dry density and the water absorption of coarse aggregate by ...
Scattering-filling coarse aggregate process. ... Fig. 2 shows that the surface of recycle aggregate is porous and loose. NA0# and RA0# were mixed gradations with 5–10 mm aggregate of 30% and 10–20 mm aggregate of 70% in mass. The gradations of coarse aggregate are also shown in Fig. 1.
DOI: 10.1016/J.CEMCONCOMP.2018.06.013 Corpus ID: 139320918; Properties of recycled aggregate concrete prepared with scattering-filling coarse aggregate process @article{Xu2018PropertiesOR, title={Properties of recycled aggregate concrete prepared with scattering-filling coarse aggregate process}, author={Gelong Xu and Weiguo …
The performance of cold recycling (CR) mixtures has been widely evaluated, but these studies rarely focused on the internal structure of CR mixtures. The objective of this research is to investigate the distribution, orientation, and shape properties of coarse aggregates in CR mixtures with emulsion by processing a series of sectional images …
