No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
Recycled concrete aggregates (RCA) obtained from C&D waste can be considered as an essential source of supplementary building material in producing 'green concrete' or recycled aggregate concrete (RAC). ... The reasonable and satisfactory explanation regarding complex phenomena, such as flow behaviour or workability of concrete with FRCA ...
There have been efforts to use building demolition waste as an alternative aggregate in concrete to decrease the use of natural resources for construction. The World Green Building Council estimates that the construction industry is responsible for more than 50% of all material extracted globally and that construction and demolition waste makes up 35% of global …
Concrete recycling to produce aggregates is crucial in reducing the demand for materials in the construction industry, particularly for the most widely used building material—concrete. A potential solution to enhance the quality of recycled aggregates involves the removal of the adhered cement paste from their surfaces. In this study, samples of industrial …
Utilization of recycled concrete aggregates (RCA) as a replacement for natural aggregates in innovative concrete has gained fame around the world as a way to decrease natural aggregate use. ... The study shows that the workability of concrete increased from 0 to 40% at various replacement of RCA relative to the conventional concrete. The ...
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 increased ...
Jianzhuang Xiaoa et al. [3] concluded stated that the compressive strength of recycled aggregate concrete generally decrease with in-creasing recycled aggregate contents. For a recycled aggregate ...
Crushed concrete aggregates also called as recycled concrete aggregates are fragments and pieces of concrete buildings which are demolished or rebuild. ... due to its absorption capacity, which would no doubt produce a shrinkage effect. Workability of recycled aggregate concretes is affected by the absorption capacity of the recycled aggregates ...
Generally, concrete with crushed aggregates requires slightly higher cement content in order to reach the same workability as a concrete with round aggregates [94]. Low workability (reduced slump and slump-flow values) is mostly reported for concrete with fRCA due to higher water demand of fRCA than the same concrete made with river sand.
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. In addition, the compressive, flexural and splitting …
To tackle the twin challenges of improving properties of recycled aggregate concrete, with or without crumb rubber, and replacing concrete using natural aggregates with …
The use of recycled aggregates (RA) for concrete production usually involves a reduction of the workability as measured by slump. This reduction is mainly due to higher absorption rates, rough-textured surfaces and particles with quite irregular shape from RA. Besides that, the slump test is a static test, whose result is influenced by its own weight and by …
The use of recycled aggregates concrete (RAC) with coarse recycled concrete aggregates (CRCA) has been widely studied in literature. ... In this chapter, a review of the existing experimental methods for the evaluation of fresh concrete workability is given. Additionally, the behavior of fresh concrete is explored, aiming to understand which ...
Natural disasters and human demolition create vast amounts of construction and demolition waste (CDW), with a substantial portion being concrete waste. Managing this concrete waste is a daunting challenge for developing countries with limited resources, aiming to mitigate its harmful environmental effects. Therefore, the proposed approach involves using recycled …
After an extensive review of the literature, Padmini et al. [2] highlight the following aspects: recycled aggregates from concrete requires more water for the same workability than conventional concrete; density, compressive strength and modulus of elasticity are relatively lower than that of the parent concrete; and for a given water/cement ...
QUEST RESEARCH JOURNAL, VOL. 21, NO. 01, PP. 125–133, JAN–JUN, 2023 125 Workability and Compressive Strength of Recycled Aggregate Concrete with
Recycled materials are now widely used in various industrial sectors to enhance sustainability and reduce environmental charges. Using recycled aggregates in concrete production significantly lowers demand for natural aggregates and the amount of solid waste sent to landfills. This paper summarizes the main results of a study undertaken to design low and …
To achieve a green recycled concrete with excellent mechanical properties and workability, this paper utilized recycled concrete powder, fly ash and granulated ground blast furnace slag as primary materials. Recycled concrete aggregates served as coarse aggregates in the formulation of a recycled concrete powder-based geopolymer recycled concrete …
MG method involves placing RCAs in a concrete mixer and separating the aggregates from the old mortar through collisions and ball milling (Bru et al., 2014; Dimiu et al., 2018; Shi et al., 2016).Old mortar could be effectively removed from the surface of RCAs via the MG method, enhancing the properties of RAC by satisfying the required specifications at a …
With the rapid development of urbanization, many new buildings are erected, and old ones are demolished and/or recycled. Thus, the reuse of building materials and improvements in reuse efficiency have become hot research topics. In recent years, scholars around the world have worked on improving recycle aggregates in concrete and broadening the scope of …
This review examines the impact of recycled aggregates (RAs) on the fresh and mechanical properties of high-strength concrete (HSC). The results revealed that incorporating RAs can reduce the compressive strength of HSC by up to 25%, with strength values ranging from 40 to 70 MPa depending on the RA content. The addition of supplementary materials like …
This review aims to present and discuss the mechanical and environmental properties of two different type of recycled aggregates obtain from construction and demolition …
The difference between RCA and natural coarse aggregates is adhered/bonded mortar from old concrete on the RCA surface (Kim et al., 2018).As RCA are obtained through the crushing of construction and demolition waste, RCA possess adhered/bonded mortar from old concrete along with natural aggregates, as shown in Fig. 10.1 (Bai et al., 2020).The …
Investigating factors such as compressive strength, durability, workability, and shrinkage helps evaluate the performance of recycled aggregate concrete and ensures …
Finally, reduction in long-term strength of the concrete containing recycled fine aggregate is less than those containing coarse aggregate or both fine and coarse aggregate. R 2 score value ...
The workability of the recycled aggregate concrete was enhanced to level comparable to the reference concrete (165 mm) by adding superplasticizer (1% of the cement weight). ... The rubber recycled aggregate concrete could be useful, for example, in making concrete wall panels, concrete lintels and road kerbs where the criteria for exposure ...
The global construction industry is increasingly utilizing concrete prepared from recycled aggregate as a substitute for natural aggregate. However, the subpar performance of recycled fine aggregate (RFA) has resulted in its underutilization, particularly in the structural concrete exposed to challenging environments, including those involving chlorine salts and …
Key parameters examined include workability, compressive strength, flexural strength, split tensile strength, microstructural characteristics (XRD, SEM, EDAX), and …
*e-mail: [email protected] Properties of High-Workability Concrete with Recycled Concrete Aggregate Md. Safiuddina*, Ubagaram Johnson Alengaramb, Md. Abdus Salamb, Mohd Zamin Jumaat b, Fahrol Fadhli Jaafar, Hawa Binti Saadb aDepartment of Civil and Environmental Engineering, Faculty of Engineering, University of Waterloo, 200 University Avenue West, …
This paper discusses the state-of-the-art of the fine recycled concrete aggregates (fRCA), focusing on their physical and chemical properties, engineering properties and …
The authors evaluated the substitution of up to 30% and observed that the use of the residue causes a reduction in the workability and a decrease in the mechanical strength of the material. ... Ji T., Liu H., Su S. Modifying Recycled Aggregate Concrete by Aggregate Surface Treatment Using Sulphoaluminate Cement and Basalt Powder. Constr. Build. ...
