There are several challenges in the production of recycled concrete aggregate (RCA) including estimating supply of C&D waste, on-site sorting, collection and transportation of waste, consistency ...
The construction sector is responsible for approximately 6 billion tons of CO 2 emissions [1].Furthermore, the demand for raw material as aggregate for concrete is around 2.7 billion tons/year in EU countries altogether [2], 900 million tons/year in the USA [3], and 700 million tons/year in Brazil [4].Besides, at the end of the construction chain, the construction of …
Concrete production, integral to construction and demolition processes, generates substantial waste. solutions and addressing resource management and environmental concerns. This literature review. design, …
Recycling construction and demolition waste in the production of recycled aggregate concrete is an attractive approach in terms of environment and economy. However, the inferior properties of ...
Waste reduction and decreasing the need for natural aggregate are significant environmental factors that should be taken into consideration. Both can be achieved by incorporating recycled concrete aggregate into fresh concrete mixes. Most previous studies on concrete incorporating recycled concrete aggregates mainly examined recycled coarse …
Studies by Rattanachu et al. (2019) focused on the utilization of ground bagasse ash (GBA) and recycled coarse aggregate (RCA) in the production of concrete with high strength. Without the inclusion of GBA in the first instance of RAC production, the results showed the negative influence of RCA on concrete durability, especially in increasing ...
The use of recycled aggregates (RA) in the concrete industry has become increasingly popular due to the reduction in natural aggregate (NA) consumption and the ability to reuse demolition waste.
Recycled aggregate concrete (RAC) is a new type of concrete produced using crushed, screened, and washed recycled aggregate obtained from waste concrete to replace natural aggregate …
Utilizing normal-strength concrete with a compressive strength of 35 MPa and a 0.45 water-to-cement ratio, fifteen mix designs were tested, varying RA and PSC replacement …
Resource utilization of construction and demolition (C&D) waste has great potential to significantly reduce the consumption of natural resources and improve the environment. Meanwhile, establishing a sound policy system and reducing production are the key ways to solve the problem of C&D waste. Numerous studies on C&D waste, recycled concrete …
Recycled concrete powder (<0.15 mm) ... It is also reported that multiple crushed concrete aggregate, will eventually have increase of the volume of old adhered mortar [11]. ... The bleeding during the concrete production is also favored by the high porosity of fRCA and high amount of fines [126]. This bleeding is magnified when recycled ...
This study provides a comprehensive review on recycled aggregate (RA) and recycled aggregate concrete (RAC) regarding their history, recycling, reuse and manufacture …
This work examines the environmental and geochemical impact of recycled aggregate concrete production with properties representative for structural applications. The environmental influence of cement content, aggregate production, transportation, and waste landfilling is analysed by undertaking a life cycle assessment and considering a life ...
Recycled concrete aggregate fractions. From left to right; 4-8 mm, 8-16 mm and 16-31.5 mm coarse aggregates. …
Over the last decade, there has been a substantial increase in the amount of construction waste, leading to growing societal and environmental concerns around the recycling of this refuse. Concrete waste is one of the most significant forms of construction waste. As a result, in order to examine the influence of recycled coarse aggregate (RCA) on concrete, this …
Since the construction industry is one of the major sectors responsible for the overexploitation of natural resources and the production of greenhouse gases, there is an urgent need to adopt a sustainable and environmental friendly approach to mitigate climate degradation. Research has explored the potential of recycled aggregate (RA) as a viable alternative to …
Electric arc furnace (EAF) slag is a by-product of steel production in electric arc furnaces. Several studies have tried to demonstrate its suitability in civil engineering application, such as in bituminous mixtures and cement-based materials, due to its good physical, chemical and mineralogical properties. Particularly the re-use as coarse aggregate for concrete …
In this scenario, replacing NA with recycled aggregate (RA) from C&DW and other wastes can mitigate environmental problems. We review the use of RA for concrete production and draw …
Much of the U.S. research focused on using crushed, hardened concrete as an aggregate in fresh concrete has been in mainline paving. Work on this topic began with a major effort in the 1980s in Minnesota. Unfortunately, most of the research focused on using recycled concrete aggregate (RCA) as a base material to the pavement.
Based on previous studies, Xiao et al. (2021b) proposed a concept of fully recycled aggregate concrete (FRAC), which used both recycled coarse and fine aggregates (RCA&RFA) to maximize the utilization of waste concrete and reduce the environmental impact of concrete production. The basic mechanical properties, shrinkage behaviors and the compressive stress …
A field study of recycled aggregate concrete in structural and non-structural element. • Compressive strength and rebound hammer correlation of recycled aggregate concrete. • Long term (up to 5 years) in-situ performance of recycled aggregate concrete. • The long-term strength of recycled aggregate concrete was comparable to conventional ...
The global aggregate production of 40 billion tons (Fig. 1) is an indication of the vast development projects which are materializing around the world [1].As the land for landfill becomes scarce and the world demand of aggregate reaches to an enormous 40 billion tons annually, ways to use C&D waste is gaining importance due to legislation, it is cheaper and …
In this scenario, replacing NA with recycled aggregate (RA) from C&DW and other wastes can mitigate environmental problems. We review the use of RA for concrete production …
Recycled concrete aggregates (RCAs) produced from concrete wastes are estimated to cost less than natural aggregates (NAs). Tam [7] investigated the economical considerations of recycling concrete waste.It was reported that the long-term net benefit of producing coarse recycled concrete aggregate (CRCA) from waste concrete was positive with …
Milled waste glass was used as secondary cementitious material towards production of recycled aggregate concrete with improved strength and durability attributes. Experimental investigation of the ...
Abstract: Recycled concrete aggregate is considered as the most abundant and used secondary aggregate in concrete production, other types of solid waste are also being used in concrete for
Recycled concrete aggregate or Crushed concrete aggregate eliminates the need for disposal by using the readily available concrete as an aggregate source for new concrete or other applications. ... It is proven that the freezing and thawing resistance of concrete made with recycled concrete aggregate is the same as concrete production with ...
Reuse of recycled aggregate in the production of alkali-activated concrete. P. Chindaprasirt, T. Cao, in Handbook of Alkali-Activated Cements, Mortars and Concretes, 2015 19.2 A brief discussion on recycled aggregates. Recycled aggregate is defined as aggregate resulting from the processing of inorganic or mineral material previously used in construction (BS EN 12620, …
As the construction industry faces growing environmental concerns and a need for viable practices, this study explores the potential for substituting natural aggregates (NA) with …
In this scenario, replacing NA with recycled aggregate (RA) from C&DW and other wastes can mitigate environmental problems. We review the use of RA for concrete production and draw the main ...