The use of recycled concrete aggregate (RCA) from construction and demolition (C&D) waste is a rational way towards better sustainability in the construction …
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
Beneficiation; Recycled concrete aggregates; Recycled aggregate concrete; Hydrochloric acid; Construction and demolition waste; Compressive strength; 1 Introduction. Concrete is the second most used construction material after water in the world. The evergrowing construction industry forces more use of construction materials …
WhatsApp: +86 18221755073
This study was also intended to enhance the strength and durability properties of concrete by using chemically and mechanically beneficiated recycled …
WhatsApp: +86 18221755073
This monograph addresses the use of recycled concrete aggregates (RCA) as a replacement for natural aggregates (NA) in concrete applications. It aims to provide information and perspectives on ...
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
In particular, recycled concrete aggregate (RCA) can be used to produce new recycled aggregate concrete (RAC) elements [1][2][3] [4]. The use of RCA as a replacement of natural aggregate (NA ...
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
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 ...
WhatsApp: +86 18221755073
The recycled fine aggregates used in this experiment were manufactured by Company G in Cheonan, Chungcheongnam-do Province. The production process for the recycled fine aggregates consisting of four processes such as a jaw crusher, cone crusher, vertical impact crusher and two-level roll crusher is shown in Fig. 2.Following …
WhatsApp: +86 18221755073
This research study investigates the effect of using recycled coarse aggregate (RCA) as a substitute of natural coarse aggregate (NCA) on the mechanical properties of concrete.
WhatsApp: +86 18221755073
This study systematically investigates modification methods for recycled aggregate, including acid modification, abrasion testing, and triple-mixing improvement. Recycled aggregate from a single source replaced 50% and of natural aggregate in concrete mixes, which were compared to controls using natural aggregate and …
WhatsApp: +86 18221755073
Crushed concrete in the form of recycled coarse aggregate (RCA), steel fibres (SF) of 30–50 kg/m3 and styrene-butadiene rubber (SBR) latex of 5%, 10%, and 15% by cement weight attempted to ...
WhatsApp: +86 18221755073
Furthermore, around 32 bi tons of natural aggregate (NA) are extracted annually. In this scenario, replacing NA with recycled aggregate (RA) from C&DW and …
WhatsApp: +86 18221755073
The use of recycled concrete aggregate (RCA) from construction and demolition (C&D) waste is a rational way towards better sustainability in the construction industry. By using concentrated solar energy for the heating, thermomechanical beneficiation of concrete waste has been shown here to produce high-quality RCA. In …
WhatsApp: +86 18221755073
DOI: 10.1016/J.CEMCONCOMP.2019.103360 Corpus ID: 201285524; Carbonation treatment of recycled concrete aggregate: Effect on transport properties and steel corrosion of recycled aggregate concrete
WhatsApp: +86 18221755073
The main problem in using recycled concrete aggregate (RCA) as a construction material is due to the weak adhered mortar which usually has higher porosity and water absorption.
WhatsApp: +86 18221755073
Recycled concrete aggregates (RCA) are produced by reducing the size of concrete debris through multiple crushing stages. Depending on the size, the crushed concrete …
WhatsApp: +86 18221755073
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
WhatsApp: +86 18221755073
Thermo-mechanical beneficiation process for crushed concrete. • Quality parameters and acceptance criteria for optimizing recycling. • Tuning of beneficiation …
WhatsApp: +86 18221755073
To investigate the effects of RCA beneficiation on the properties of concrete made using the microwave-treated recycled aggregates (MRCA), six batches containing various amounts of coarse MRCA (0%, 20%, 40%, 60%, 80% and , replacement …
WhatsApp: +86 18221755073
The dynamic mechanical properties of recycled concrete (RC) and natural concrete (NC) were studied by impact tests and numerical simulation. The quasi-static tests were conducted by a servo-hydraulic machine, while the impact test used a 50 mm diameter split-Hopkinson pressure bar (SHPB). The ANSYS/LS-DYNA software …
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
Crushing demolition waste concrete to produce recycled aggregates for production of new concrete is one common means for achieving a more environmentally friendly concrete. ... Microwave-assisted beneficiation of recycled concrete aggregates. Construction and Building Materials, 25(8), 3469–3479. Article Google Scholar Yildirim, …
WhatsApp: +86 18221755073
The recycling of concrete waste into recycled concrete aggregate (RCA) by crushing concrete lumps into smaller particles has been identified as a potential source of alternative aggregate for production of environmental friendly concrete [18]. ... Microwave-assisted beneficiation of recycled concrete aggregates. Constr Build …
WhatsApp: +86 18221755073
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 paste weakens the adhesion between the aggregate and the binder, it becomes a decisive factor in the mechanical …
WhatsApp: +86 18221755073
The properties of Portland cement concrete and geopolymer concrete made with varying contents of coarse geopolymer recycled aggregates (0%, 20%, 50% and coarse natural aggregates replacement ...
WhatsApp: +86 18221755073
Extraction of recycled concrete aggregates (RCA) from construction and demolition waste is an effective way to induce sustainability in the highway sector.
WhatsApp: +86 18221755073حقوق النشر والنسخ؛ 2024.Aava جميع الحقوق محفوظة.خريطة الموقع