Results show that the workability of RCWA concrete reduce as the content of RCWA increase in the mix as the water absorption of RCWA is higher than the NA. The compressive strength of the RCWA concrete is …

 · Introduction. Recycled aggregate (RA) derived from construction and demolition waste is suitable for partial or entire replacement for aggregate when making new …

 · The use of recycled aggregates concrete (RAC) with coarse recycled concrete aggregates (CRCA) has been widely studied in literature. A number of works investigated both mechanical and durability-related properties of these concretes; however, fresh properties of RAC have not been extensively analyzed yet. Limited studies were focused …

This research investigates the effect of basalt fibers (BF) on the workability and early-age compressive and splitting tensile strengths of concrete made with recycled concrete aggregates (RCA). The target concrete compressive strengths were 30,

 · After an extensive review of the literature, Padmini et al. highlight the following aspects: recycled aggregates from concrete requires more water for the same workability …

The second study examines how the workability and compressive strength characteristics of concrete mixes are affected when varying amounts of recycled concrete fines are used as cement replacement. Experimental procedures for both studies involved the breaking and crushing of cast concrete blocks to produce recylced materials.

 · The models were proposed by accounting for the effects of water-cement ratio, proportion of recycled fine aggregates and proportion of recycled coarse aggregates in …

 · The results suggested that an AD aggregate that contains not more than 50% recycled aggregate is optimum for producing normal strength recycled aggregate concrete. View Show abstract

 · 4. Advantages of Recycled Concrete Aggregate 1. Decreases the cost of construction. 2. Preserve natural resources. 3. It is a high water absorption capacity. 4. It is regarded as green construction material. 5. Disadvantages of Recycled Concrete Aggregate 1. It downgrades the quality of concrete. 2. Workability of concrete is decreased. 3.

 · Well-graded aggregates have higher workability of concrete. If the aggregates are graded well, the void in the concrete will be minimal. It increases the workability of concrete. Further, the reduction of the voids in the concrete avoids the segregation of concrete. Surface Texture of Aggregates

 · This study presents the effects of recycled concrete aggregate (RCA) on the key fresh and hardened properties of concrete. RCA was …

 · This project reports the suitability of recycled coarse aggregate as replacement in concrete at different water-cement ratio (0.45, 0.50 and 0.55) and attempts to compare the mechanical and ...

 · The use of recycled aggregates concrete (RAC) with coarse recycled concrete aggregates (CRCA) has been widely studied in literature. A number of works investigated …

 · It was found that the high water absorption of RFA reduces the workability of the prepared fresh concrete. In coarse aggregate concrete, an increase in the water-to-ash ratio (W/C) or the addition of additives or mineral additives is required to offset the lower workability of the RAC [ 23 ].

 · The workability of recycled aggregate concrete not only depends on the absorption capacity of recycled aggregate but also on the shape and texture of recycled aggregates (Rashwan and Abourizk 1997). As the recycled aggregates are more angular due to the crushing and thereby higher surface-to-volume ratio, internal friction was …

 · Workability of Recycled Aggregate Concrete RAC has higher water absorption capacity because the contaminants become the primary absorber. This increased absorption capacity and porosity result in low specific gravity and low bulk density. So high water content is required to achieve the same workability as NAC.

and structural performance of recycled aggregate concrete (RAC) over the past 10 years – demonstrate that, with proper design and construction, it is safe and feasible to utilize RAC structures in civil engineering applications. The book will greatly ...

 · For grade 40 concrete, the optimum RCWA replacement is at 30% and at 50% replacement, the compressive strength of the RCWA concrete is lower than the design …

 · The use of recycled aggregates concrete (RAC) with coarse recycled concrete aggregates (CRCA) has been widely studied in literature. A number of works investigated both mechanical and...

 · The shape of the aggregate pieces is influential on the workability of the concrete. Exteberria et al. ( 2007) warned that the method of producing RCA and the type of crusher that is used in this process is influential in the shape of RCA produced. NA is generally an angular shape with smooth sides.

 · in general, the use of recycled aggregate led to reduction in all mechanical properties, in addition to influencing the fresh stage properties and concrete durability due to high absorption and porosity (xiao et al. 2006; yang et al. 2008; kwan et al. 2012; manzi et al. 2013; akbarnezhad et al. 2013; ulloa et al. 2013; xiao et al. 2014; mcneil …

Recycled concrete aggregate (RCA) are aggregates obtained by recycling clean concrete waste where content of other building waste must be very low – below few per cent. For …

Abstract This paper presents the results on workability testing as well as strength testing of self-compacting concrete containing partial/full coarse recycled concrete aggregates and ternary blended cement using ultrafine recycled powder (RP) and silica fume (SF).

 · The strength reduction of concrete produced from recycled coarse aggregate and natural fine aggregate ranges from 5% – 24%. This influenced by the strength of crushed concrete, water to cement ration of …

 · Therefore, recycled aggregate concrete (RC) is valuable, which may result in saving environmental resources, reduction of carbon emissions, and the efficient usage of demolition construction materials, resulting in a reduction in energy consumption.

 · Request PDF | Workability and Rheology of Fresh Recycled Aggregate Concrete | The use of recycled aggregates concrete (RAC) with coarse recycled concrete aggregates (CRCA) has been widely studied ...

 · Abstract - This research investigates the effect of basalt fibers (BF) on the workability and early-age compressive and splitting tensile strengths of concrete made with recycled concrete aggregates (RCA). The target concrete compressive strengths were 30, 45, and 60 MPa, whereas the basalt fibers had a length of either 20 or 43 mm.

 · Advantages of Recycled Concrete Aggregate 1. Decreases the cost of construction. 2. Preserve natural resources. 3. It is a high water absorption capacity. 4. It …

The aggregates processed from concrete rubbles, returned concrete, and tested concrete are well known as recycled concrete aggregate (RCA). The major benefits of using RCA in new construction include lower environmental pollution, reduction in the need for valuable landfill space, and conservation of resources for natural aggregates 1,4,5 .

 · The important properties of fresh and hardened recycled aggregate concrete such as workability, compressive strength, split tensile strength, flexural strength, modulus of elasticity, density and ultrasonic pulse velocity (UPV) are discussed in detail in this chapter.

This study presents the effects of recycled concrete aggregate (RCA) on the key fresh and hardened properties of concrete. RCA was used to produce high-workability concrete substituting 0- natural coarse aggregate (NCA) by weight. The slump and slump flow of fresh concretes were determined to ensure high workability.

 · (BF) on the workability and early-age compressive and splitting tensile strengths of concrete made with recycled concrete aggregates (RCA). The target concrete compressive strengths were 30, 45, and 60 MPa, whereas the basalt fibers had a length of either 20 or 43 mm. The addition of BF significantly decreased

 · Generally, 60–70 % of concrete is aggregate, which is the main ingredient in concrete for beneficial reuse and recycling . European countries have been seeking to employ recycled concrete aggregate (RA) in new RC structures since the early 1980s. Several studies have found that utilizing RA is sustainable, economical, and well …

This study presents the effects of recycled concrete aggregate (RCA) on the key fresh and hardened properties of concrete. RCA was used to produce high-workability concrete substituting 0- natural coarse aggregate …