Thermomechanical beneficiation of recycled concrete …
In the present study, an attempt has been made to employ thermo-mechanical beneficiation to obtain high-quality coarse and fine aggregates, with high …
Beneficiation Of Recycled Concrete Aggregate
Accelerated carbonation of recycled concrete aggregates …
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 …
Experimental assessment of microwave heating assisted aggregate …
Microwave assisted concrete recycling is highlighted by a large number of research groups all over the world due to its potential for significant process benefit. In this paper, systematic experiments are established to study the microwave heating and aggregate recycling of dried and saturated concrete, respectively, investigating the …
Microwave-assisted beneficiation of recycled concrete aggregates
The presence of adhering cementitious 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 aggregates (NA).
Jigs, Hydrocyclones and Sensor-Based Sorting to Value Recycled Aggregate
Aiming to increase the recycling rate on concrete formulation, the use of high quality recycled aggregates during recycling off-site or on-site is suggested. In this stage of recycling, gravity concentration by jigs and sensor-based sorting are used to separate different particles (2/20 mm) as bricks, tiles, gypsum and glass, previously ...
Carbonation, Shrinkage and Long-Term Studies on Recycled Aggregate Concrete
Crushing demolition waste concrete to produce recycled aggregates for production of new concrete is one common means for achieving a more environmentally friendly concrete. In this paper, durability properties such as drying shrinkage, carbonation and long-term...
An Investigation of Mechanical and Durability Properties of …
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 …
Influence of recycled aggregate concrete on resistance of …
In this article we present main aspects that need to be considered while designing elements from the recycled concrete. We summarize changes in properties of this type of concrete and look at the state of art in this area. Numerous studies have been performed to investigate various characteristic of recycled aggregate concrete (RAC).
Investigation on Dynamic Mechanical Properties of Recycled Concrete
Therefore, it was necessary to study the dynamic mechanics performance of recycled-aggregate-concrete-filled steel tubes under different conditions. Combined with the experiment and simulation, the mechanical behavior of the recycled-aggregate-concrete-filled steel tube was investigated.
Carbonation Behavior of Repeated Recycled Fine Aggregate Concrete …
Carbonation resistance is an important factor affecting the durability of concrete, and the carbonation behavior of structural concrete become more complex under loading. In order to investigate the feasibility of utilizing Recycled Fine Aggregate (RFA) in structural concrete under a coupling of bending load and carbonation, two …
A novel beneficiation process for producing high-quality …
In this paper, a novel process for the thermomechanical beneficiation of waste concrete for recycling is proposed through directly heating concrete chunks to …
Thermomechanical Beneficiation of Recycled Concrete Aggregates …
Thermomechanical Beneficiation of Recycled Concrete Aggregates (RCA) Thermomechanical Beneficiation of Recycled Concrete Aggregates (RCA) Post by: admin; July 21, 2023; Comments off; Categories: Previous post. Next post. Address. Building Technology, Construction Materials and Management (BTCM) Group
Recycled Concrete Aggregates – State of Play in South …
The studies undertaken at the University of Cape Town (UCT) investigated the physical, chemical, and mineralogical properties of fine recycled concrete aggregate (FRCA), targeting methods of utilising and optimising FRCA properties using minimal beneficiation, and use of supplementary cementitious materials.
Enhancing the Properties of Recycled Aggregate …
recycled coarse aggregate. This study was also intended to enhance the strength and durabilityproperties ofconcrete byusingchemically and mechanically beneficiated recycled aggregate and thus recommend the most appropriate replacement level and the beneficiation method. Keywords Beneficiation ·Recycled concrete aggregate …
Durability of Recycled Concrete Aggregates Prepared with
Recycled concrete aggregates (RCAs) have low quality when compared with natural or conventional aggregates as the paste adhering to it is the key aspect that affects its functionality. Since the adhering cementitious …
Beneficiation of recycled concrete fines through accelerated
Recycled concrete aggregates (RCA) are often produced by crushing demolished concrete rubble in different steps using jaw and impacts crushers. …
[PDF] Beneficiation of recycled concrete fines through …
In the present work, the effects of accelerated carbonation on the physical and microstructural properties of recycled concrete fines are systematically studied. The RCF was prepared by crushing a base CEM I concrete mixture made in laboratory with a water-to-cement ratio of 0.54 and seal-cured for 28 days. The effects of CO2 …
Effects of the Parent Concrete Properties and Crushing …
The most important parameters associated with recycled concrete aggregate (RCA) production that may affect quality and yield include such properties of the parent concrete as the composition, strength and aggregate grading, type of crushers used, number of crushing stages, the size of the RCA particles, and the size reduction …
Hardened state behavior of beneficiated recycled aggregate concrete
Physical characteristics of the coarse recycled aggregates were improved by adopting three different beneficiation techniques i.e. chemical beneficiation, mechanical beneficiation and chemical-mechanical beneficiation.
Investigation of microwave-assisted concrete recycling using single
For new concrete structures requiring standard performance levels, the use of recycled concrete aggregate (RCA) ... to the more recent work on improved beneficiation of recycled concrete aggregates using microwaves by Akbarnezhad et al. (2011). It is worth emphasising that microwaves induce stresses from multiple sources …
Performance Studies of Pavement Quality Concrete Mix
Incorporating recycled concrete aggregate (RCA) is one way of recycling and using demolished concrete waste. However, it is an established fact that recycled concrete aggregates used without surface treatment/beneficiation exhibit inferior properties in comparison...
Workability and mechanical properties of microwave heating …
The capability of the microwave assisted beneficiation of recycled concrete aggregate is experimentally investigated by Akbarnezhad. Microwave heating leads to significantly improvements in the properties of recycled concrete aggregate compared with other conventional beneficiation methods [33].
Carbonation treatment of recycled concrete aggregate: …
Semantic Scholar extracted view of "Carbonation treatment of recycled concrete aggregate: Effect on transport properties and steel corrosion of recycled aggregate concrete" by Baojian Zhan et al.
The Optimum Production Method for Quality Improvement of Recycled …
The testing on the quality of the recycled aggregates was conducted according to the items listed in the quality standards for recycled aggregates (limited to recycled fine aggregates used in concrete manufacture), and of the physical properties specified in the quality standards, the most important quality characteristics of recycled …
Microwave-assisted beneficiation of recycled concrete …
Recycled concrete aggregates (RCA) are produced by reducing the size of concrete debris through multiple crushing stages. Depending on the size, the crushed concrete particle may comprise one or more particles of natural coarse aggregate held together and surrounded fully or partially by a layer of mortar (Fig. 1a and b). In
Microwave-assisted beneficiation of recycled concrete …
The use of recycled coarse aggregates (RA) in concrete is a sustainable alternative to non-renewable natural aggregate (NA) to fabricate concrete products using …
A Comprehensive Review on Recycled Aggregate and Recycled Aggregate …
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, …
Quality Improvement of Recycled Concrete Aggregate by
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 …
Tensile strength behaviour of recycled aggregate concrete
The geometry of the attached mortar present in recycled concrete aggregates influences the behaviour of recycled aggregate concrete, since this mortar is porous, rough and tends to increase the elongation of aggregate particles.
Sustainable Materials: A Review of Recycled Concrete Aggregate
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).
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