Properties of recycled concrete aggregate and their influence in new concrete production. Author links open overlay panel Kho Pin Verian a, Warda Ashraf b, Yizheng Cao c. ... The annual production of recycled materials derived from old asphalt pavement reached 0.8 million metric ton in Sweden in 1999, in which 95% of it was used …
Recycled aggregates (RA) from construction and demolition waste (CDW) instead of natural aggregates (NA) were analysed in the manufacture of new eco-friendly concrete. Fine (FRA) and coarse (CRA) recycled aggregates were used in different percentages as substitutes of natural sand and gravel, respectively. The results revealed …
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 …
Recycling concrete provides sustainability several different ways. The simple act of recycling the concrete reduces the amount of material that must be landfilled. The concrete itself becomes aggregate and any embedded metals can be removed and recycled as well. As space for landfills … See more
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 aggregates are used in a dry state in the concrete mix. ... Zhang et al. [149] proposed a time-dependent drying shrinkage model for concrete with coarse and fine recycled …
One such C&DW is the recycled concrete aggregate (RCA) being explored for concrete production [28][29] [30] [31][32][33]. RCA collected from construction and demolition sites is a viable solution ...
Martinez-Arguelles G., Acosta M. P., Dugarte M., Fuentes L. Life Cycle Assessment of Natural and Recycled Concrete Aggregate Production for Road Pavements Applications in the Northern Region of Colombia: Case Study. Transportation Research Record: Journal of the Transportation Research Board, 2019. 2673: 397–406.
1. Introduction. Concrete is the second most used material by volume on Earth. Portland cement is the main binder of concrete, and its production (estimated at …
Nowadays, recycled aggregate use in concrete production increases worldwide as a result of its reliable performance, ensuring sustainability and reducing landfill problems. Besides, partial replacement of conventional quarry aggregates by recycled aggregates can reduce energy consumption as well as CO 2 emission by around 46% …
In addition, methods for enhancing the mechanical characteristics of recycled aggregate and long-term efficiency such as improving the properties without modifying the recycled aggregate (namely, different concrete mixing designs and the addition of reinforcing fibers) were reviewed.
Recycled aggregates. Said Kenai, in Waste and Supplementary Cementitious Materials in Concrete, 2018. Abstract. Construction industry generates huge amounts of debris that needs to be recycled and reused as recycled aggregates (RAs) for partial or total substitution of natural aggregates. Recycling reduces waste and reduces energy …
This paper reviews the use of Recycled Aggregate (RA) that is collected from construction demolition waste in the production of concrete. The paper primarily focuses on the possibility of using RA in High Performance Concrete (HPC). By analytically reviewing previous work, this study reports the mechanical and physical properties of …
Figure 3. Recycled concrete aggregate fractions. From left 4–8 mm, 8–16 mm. and 16 – 31.5 mm coarse aggregates. All component materials were tested prior to mix proportion design. The ...
The mass production of concrete and construction waste will significantly impact the natural environment. The production of cement and gravel consumes the non–renewable resource of stone. ... Recycled aggregate concrete (RAC) is made by mixing construction solid waste into recycled aggregate according to a certain …
"Substitution potential of plastic fine aggregate in concrete for sustainable production." In Vol. 35 of Structures, 622–637. Amsterdam, Netherlands: Elsevier. ... L. …
WRAP Guidance on the Quality Protocol requirements for the production of aggregates from inert waste: The Environment Agency is currently reviewing the WRAP protocol for the production of aggregates from inert waste and MPA are at the forefront as the industry voice on recycled and secondary materials for aggregate production.
After demolition of old roads and buildings, the removed concrete is often considered worthless and disposed of as demolition waste. By collecting the used …
Emissions for concrete with 0.5 w/c were between 347 and 351 kg of CO 2 - e /m 3. It was also corroborated that cement is the material with the greatest influence on greenhouse gas emission generation in the concrete's production phase, regardless of the use of recycled or aggregates. 1. Introduction.
In Australia, recycled aggregate (both as coarse and as fine aggregate) has been the most common C&D waste used in concrete production. About 5.0 million …
Unfortunately, most of the research focused on using recycled concrete aggregate (RCA) as a base material to the pavement. But in other parts of the world, many recognize RCA as a valuable aggregate source when properly intregated into the mix design process. For example, Japan has used RCA for more than 20 years in structural …
It was reported that the long-term net benefit of producing coarse recycled concrete aggregate (CRCA) from waste concrete was positive with a value of US$ 22,334,116 per year, while that of crushed coarse natural aggregate (CNA) was a negative net value of US$ - 31,841,109 per year. ... the commercial production of recycled …
The use of recycled aggregates for concrete production is regulated through the European existing standards, and it is limited to the coarse recycled …
AN INTRODUCTION TO RECYCLED AGGREGATE CONCRETE: PRODUCTION AND APPLICATIONS Piyush Sharma Department of Civil Engineering, Amity School of Engineering & Technology Amity University, Haryana, India Email: piyushsharma1015@gmail ABSTRACT To obtain good quality concrete using …
Part 3-production of recycled aggregate by real-scale plant and quality of recycled aggregate concrete. In: Sustainable Construction: Use of Recycled Concrete Aggregate: Proceedings of the International Symposium Organised by the Concrete Technology Unit, University of Dundee and held at the Department of Trade and Industry …
The specific gravity of recycled concrete aggregate was found from 2.35 to 2.58 which are lower as compared to natural aggregates. Since the recycled concrete aggregate demolished concrete consists of crushed stone aggregate with old mortar adhering to it. Density. The density of recycled concrete aggregate is smaller than …
According to research conducted by Domingo-Cabo et al. (2009), their results showed that recycled concrete shrinkage with 50% partial replacement was around 20% greater than that of the control experiment, whereas with a percentage replacement cured beyond 180 days the 70% increase in shrinkage was recorded. 20.7.
Recycled aggregate concrete (RAC) is produced in three major steps: Evaluation of Source concrete: The first step in production of RAC is to determine the quality of the source concrete. Properties and records of source concrete like strength, durability and composition are looked into for deciding the proper source concrete.
This study was performed to evaluate the freezing and thawing properties of the high strength concrete using recycled coarse aggregate. The recycled coarse aggregate replaced natural crushed ...
We review the use of RA for concrete production and draw the main challenges and outlook. RA reduces concrete's fresh and hardened performance …
Recycled aggregate concrete projects (a) Casting of foundation system (including basement walls) of the residential building; (b) casting of sidewalk; (c) coring of concrete block; (d) marked sidewalk with RCA content. ... further study on large-scale production of recycled aggregate concrete using a two-stage mixing approach could …
Previous studies on recycled aggregate concrete used natural aggregate concrete as a baseline to study the effect of different RCA&RFA replacement rates on the properties of concrete ... Sustainable production of recycled concrete aggregates by lime treatment and mechanical abrasion for M40 grade concrete. Construct. Build. Mater., …
Furthermore, this study is expected to contribute to the use of recycled aggregate in the future. As a follow-up study, the mechanical and durability characteristics of recycled aggregate concrete with varying density and various absorption rates should be explored and CO 2 emissions from recycled aggregate production should be studied.
This paper discusses the suitability of producing concrete with 100 % recycled aggregate to meet durability and strength requirements for different applications. Aggregate strength, gradation, absorption, specific gravity, shape and texture are some of the physical and mechanical characteristics that contribute to the strength and durability …
To offset the shortcomings of recycled aggregate concrete (RAC) made from recycled aggregates, the application of nano-materials has been proved as an innovative and highly efficient strategy. ... Furthermore, the production of concrete generates about 7% of CO 2 emission worldwide, which leaves a huge source of carbon …