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The presence of mortar has been reported as the main factor causing the lower quality of recycled concrete aggregates (RCA) when compared to natural aggregates (NA). A novel microwave-assisted technique to increase the quality of RCA …
Thermo-mechanical beneficiation process for crushed concrete. • Quality parameters and acceptance criteria for optimizing recycling. • Tuning of beneficiation …
EFFECT OF THERMOMECHANICALLY BENEFICIATED RECYCLED CONCRETE AGGREGATES ON THE MECHANICAL AND DURABILITY …
DOI: 10.1016/j.conbuildmat.2021.125200 Corpus ID: 239496468; Thermomechanical beneficiation of recycled concrete aggregates (RCA) @article ...
1. Introduction. More natural resources are consumed for the production of concrete than for any other product (Nawy, 2008).For new concrete structures requiring standard performance levels, the use of recycled concrete aggregate (RCA) is generally accepted to be limited to 20–30% of total aggregate volume (Tam and Tam, 2006) …
Akbarnezhad A, Ong KCG, Zhang MH, Tam CT, Foo TWJ (2011) Microwave-assisted beneficiation of recycled concrete aggregates. Constr Build Mater 25(8):3469–3479. Article Google Scholar de Juan MS, Gutiérrez PA (2009) Study on the influence of attached mortar content on the properties of recycled concrete aggregate. …
By crushing old concrete to make recycled concrete aggregates (RCA) for use in new concrete, the overall environmental impacts of concrete are reduced. ... Microwave-assisted beneficiation of Recycled Concrete Aggregates. Constr. Build. Mater., 25 (8) (2011), pp. 3469-3479. View PDF View article View in Scopus Google …
mortar is the reason why the strength of recycled aggregate concrete (RAC) is less. Recycled aggregate can be extracted from demolished waste of concrete and thus it is termed as RCA [6]. The old mortar that is adhered to the aggregate is porous and has cracks and fissures which make it weak. In some researches, for a particle size of …
The compressive strength of carbonated recycled aggregate concrete (CRAC) was generally superior to that of non-carbonated recycled aggregate concrete (NRAC). ... Microwave-assisted beneficiation of recycled concrete aggregates. Constr. Build. Mater., 25 (8) (2011), pp. 3469-3479, 10.1016/j.conbuildmat.2011.03.038.
The presence of mortar has been reported as the main factor causing the lower quality of recycled concrete aggregates (RCA) when compared to natural aggregates (NA). A novel microwave-assisted technique to increase the quality of RCA by partially removing the mortar adhering to RCA particles and breaking up the lumps of mortar present in RCA is ...
However, although the microwave-assisted beneficiation of recycled concrete aggregates has been studied to some extent, there are few studies on the properties of the RCA after microwave treatment and performances of concrete prepared with microwave treated aggregates. In order to make better understanding of …
Therefore, this study examined the use of recycled concrete aggregate (RCA) as a full replacement for natural aggregate (NA) in a hot mix asphalt (HMA) mixture for a heavy-duty asphalt surface. A modified thermal-mechanical beneficiation method was employed to improve the RCA abrasion resistance to meet the Los Angeles abrasion …
From the flexural strength test results obtained with respect to aggregates with beneficiation process, all the mix proportions with replacement have achieved required strength as per the IRC standards. ... Structural concrete with simultaneous incorporation of fine and coarse recycled concrete aggregates: Mechanical, durability …
Microwave-assisted beneficiation of recycled concrete aggregates: Authors: Gary, O.K.C. Akbarnezhad, A. Hong, Z.M. Tim, T.C. Foo, T.W.J. Issue Date: 2010: ... mortar has been reported to be one of the main factors lowering the performance of concrete mixtures made with recycled concrete aggregates (RCA) when compared to natural …
The restricted reuse of recycled concrete aggregate (RCA) can be justified, even in part, by the impact on strength and durability of new RCA-based concrete, instead of natural aggregates. ... Tam CT, Foo TWJ. Microwave-assisted beneficiation of recycled concrete aggregates. Constr Build Mater. 2011;25(8):3469-79. doi: …
During the demolition and recycling process the specific surface area per volume of concrete is significantly increased. As a result, the potential for CO 2 absorption by carbonation of the cement hydrates is enhanced. In this study, recycled concrete aggregates (RCA) with varying moisture contents are carbonated with CO 2 at …
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). ... Akbarnezhad A., Ong K.C.G., Zhang M. H., Tam C. T., Foo T. W. J. …
Although the recycled aggregate concrete (RAC) is promoted globally, its use in structural applications is restricted because of its inferior durability owing to the porous and weak residual mortar adhered to recycled aggregate particles. The accelerated carbonation treatment has a potential to modify the pore structure of recycled …
Depending on the size, the coarse recycled concrete aggregates (RCA) may comprise one or more particles of natural coarse aggregates, surrounded fully or partially by a layer of mortar and/or cement paste (hereafter denoted as Type I RCA; Figs 10.1a and b) or may essentially be a lump of mortar with varying proportions of smaller …
1. Introduction. Concrete is the second most used material by volume on Earth. Portland cement is the main binder of concrete, and its production (estimated at 4.3 bi ton/year) accounts for about 8% of the global CO 2 emission [].Besides the CO 2 emission released by cement production, large amounts of sand and gravel are …
Thus, the use of Fine Recycled Concrete Aggregate (FRCA) is becoming increasingly important, as this fine fraction is generated in large quantities when recycled coarse aggregates are produced. ... Further detail on the beneficiation process are available on a recent study proposed by Rangel et al. [24]. Specifically, 6756 kg and …
There is a need to promote high-value added utilization of recycled aggregates, considering the aspect of effective use. It should be noted, however, that recycled fine aggregates are generally low in quality due to the presence of cement paste attached to the aggregate surface. Based on this, there have been studies, which aimed …
Akbarnezhad A, Ong K C G, Zhang M H, et al. Microwave-Assisted Beneficiation of Recycled Concrete Aggregates[J]. Constr. Build. Mater., 2011, 25(8): 3 469–3 479. Article Google Scholar Touzé S, Bru K, Ménard Y, et al. Electrical Fragmentation Applied to the Recycling of Concrete Waste - Effect on Aggregate …
This study was also intended to enhance the strength and durability properties of concrete by using chemically and mechanically beneficiated recycled …
The concrete industry is a huge industry that is growing at a faster rate and that leads to the consumption of a plenty of Natural Aggregates (NA) which puts the non-renewable natural resources in ...
Due to the presence of old mortar (OM) and interfacial transition zone (ITZ), recycled concrete aggregate (RCA) is inferior to natural aggregate (NA). The purpose of this paper was to study the effect of accelerated carbonation on the macro-properties and micro-properties of RCA under different pressure (0.05, 0.15, 0.30 MPa). The macro …
Recycled concrete aggregates derived from construction and demolition waste have a lot of adhered mortar and are porous and less dense. The volume of the adhered mortarvariesfrom25to60%dependingupontheamountofmortar[5].Thisadhered mortar is the reason why the strength of recycled aggregate concrete (RAC) is less.
The use of recycled coarse aggregates (RA) in concrete is a sustainable alternative to non-renewable natural aggregate (NA) to fabricate concrete products …
In the present study, an attempt has been made to employ thermo-mechanical beneficiation to obtain high-quality coarse and fine aggregates, with high yield (>90%). Heating temperature, feed size ...
This paper reviews the findings of research on the effects of recycled fine aggregates (RFAs) on the permeability, drying shrinkage, carbonation, chloride ion …
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