Modeling the mechanical properties of recycled aggregate concrete …
1. Introduction. Reduction of carbon dioxide (CO 2) emissions associated with key industries such as building and construction plays a crucial role in achieving climate neutrality by 2050 (Rosa et al., 2022).Among these, the use of building materials, a major one of which is concrete, is a significant source of CO 2 emissions. The annual …
Recycled Concrete Aggregate
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 …
Compressive strength of concrete with recycled aggregate; a machine …
Firstly, linear, nonlinear regression and Random Forest methods are used to propose prediction models for estimating compressive strength of concrete with recycled aggregate.
Sustainable Materials: A Review of Recycled Concrete Aggregate
In this paper, a comprehensive literature review was conducted on the utilization of recycled concrete aggregate (RCA), which is the dominant construction and demolition waste material, in base and subbase layers and its comparison with natural aggregate (NA).
Aggregates for Concrete
Chapter 7—Recycled aggregates, p. E1-23 7.1—Introduction to recycled aggregates 7.1.1—Definition 7.1.2—Properties Chapter 8—Selected references on aggregates, p. E1-24 ... Sieve sizes commonly used for concrete aggregates are detailed in Table 1, and various physical properties of normalweight aggregates, with typical range values ...
Design Strategy for Recycled Aggregate Concrete: A Review …
Currently, a number of disadvantages hampers the use of recycled concrete aggregates (RCA). The current review proves that concretes made with complete replacement of natural aggregate with RCA allow the production of high-quality concrete. One of the possibilities for improving concrete properties with RCA is the use of …
Bond strength between recycled aggregate concrete and …
After one end of the rebar is buried in the recycled aggregate concrete mix and cured for a particular time, it becomes resistant to being pulled out when an external force F is applied to the other end of the rebar. This indicates the existence of forces acting at the interface between recycled aggregate concrete and rebar, i.e., bond stresses [35].
Materials | Free Full-Text | Environmental and Economic
The construction sector must incorporate the circular economy to improve sustainability and efficiency. The use of recycled aggregates (RAs) as a substitute for natural aggregates (NAs) is currently being investigated and is expected to yield considerable benefits in the future. The objective of this research is to evaluate the …
Guidelines for Recycled Aggregate Concrete Materials …
(2) The mixing, selection, and weighing machinery used in the production of recycled aggregate concrete should be in accordance with the following: 1. Mixing machinery …
Aggregates for Concrete as per American Standards – ASTM …
🕑 Reading time: 1 minute The aggregates used in the production of concrete are inert granular materials such as gravel, crushed stone, sand, slag, recycled concrete, and geosynthetic aggregates. The aggregates may be natural, manufactured, or recycled. Fig 1: Aggregates used in production of concrete. The aggregates are broadly classified …
Materials | Free Full-Text | A Comparison of Machine …
Several types of research currently use machine learning (ML) methods to estimate the mechanical characteristics of concrete. This study aimed to compare the capacities of four ML methods: eXtreme gradient boosting (XG Boost), gradient boosting (GB), boosting (CB), and extra trees regressor (ETR), to predict the splitting tensile …
Recycling Concrete Pavements and Utilizing Recycled …
The practice of recycling existing concrete pavements into new paving applications is supported by the Federal Highway Administration (FHWA 2002), which states that …
Evaluating compressive strength of concrete made with recycled concrete …
Introduction. Concrete is one of the most common materials used in the construction industry. Due to the rapid development of the economy as well as urbanization, the construction of new structures and the demolition …
Ways to Recycle and Reuse Concrete
Equipment Used to Recycle Concrete . When considering concrete recycling as an option, you will also need to evaluate the options available for crush the concrete. The most practical solution can be a portable crusher that can be moved to different locations or projects. ... Aggregate for mixing new concrete: Crushed …
Recycled Aggregates: What You Should Know | Travis Perkins
Recycled aggregate concrete (RAC) is also known as recycled concrete aggregate (RCA). Aggregate recycling describes the processing of new granular building materials, from previously used crushed construction aggregates and demolition waste, which has been broken down into a specific size and mixed ready for reuse.
AI-Assisted optimisation of green concrete mixes incorporating recycled
1. Introduction. Concrete is the most commonly used material in the construction industry [1].However, with more than 10 billion tons of annual production, concrete manufacturing contributes to 8% of global greenhouse gas emissions, 3% of global energy use, and significant natural resource depletion [2].Therefore, the transition …
Exploring elastic properties of fly ash recycled aggregate concrete
Fly ash recycled aggregate concrete behavior and its microstructure are examined in this study. • Multiscale modeling was used to simulate fly ash recycled aggregate concrete's micro-, meso-, and macroscale behavior. • This study utilized machine learning to predict recycled fly ash aggregate concrete's elastic properties. •
A comprehensive review on the use of recycled concrete …
Using recycled concrete aggregates (RCA) for pavements is crucial to achieving sustainability. Implementing RCA for new pavement can minimize carbon …
A novel ant colony-optimized extreme gradient boosting machine …
Utilization of recycled aggregates generated from demolition waste for concrete production is a viable option for reducing the environmental impact of the construction industry on the environment. Compressive strength (CS) is a crucial parameter of recycled aggregate concrete (RAC), which is required in the design and …
Bond strength between recycled aggregate concrete and …
Utilizing recycled aggregate instead of some or all of the natural aggregate helps consume construction waste and promotes the reuse of waste resources, In addition, recycled aggregate concrete reduces carbon emissions by 7.1% - 13.3% and CO 2 intensity by 13.4% - 18.4% compared to natural aggregate concrete [13], [14], [15].
Carbonation of Recycled Concrete Aggregates for New Concrete …
Mineral carbonation provides a way to increase the recycling of concrete waste in added-value products, and contributes to the principles of the circular economy. At present, most concrete waste is still downcycled. The high water absorption of recycled concrete aggregates, among other factors, impedes their recycling in the concrete …
(PDF) Concrete using recycled aggregates
PDF | Worldwide, cities generate about 1.3 billion Tonnes of solid waste per year. Building materials account for about half of all materials used and... | Find, read and cite all the research you ...
Recycled Aggregates for Concrete Production: State-of …
Only the chipping of concrete according to type 1 and type 2 (as defined in the above standard) can be used for concrete production. Type 1 RA can be associated to a RCA: it contains at least 90 % of concrete and natural aggregates, not more than 10 % of clinker, non-pored bricks, sand-lime bricks, less than 2 % of other mineral materials …
Machine learning-based approach for optimizing mixture …
1. Introduction. Plastics have been used for a wide range in real-life applications, especially with the growth of emerging markets. In 2019, the global production of plastic reached a staggering 460 million tons, doubling from the levels seen in 2000 [1].Correspondingly, plastic waste generation also surged, reaching around 353 million …
Materials | Free Full-Text | Machine Learning Prediction …
Compressive and flexural strength are the crucial properties of a material. The strength of recycled aggregate concrete (RAC) is comparatively lower than that of natural aggregate concrete. Several factors, including the recycled aggregate replacement ratio, parent concrete strength, water–cement ratio, water absorption, …
Durability of Recycled Concrete Aggregates Prepared with
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. ... The Los Angeles machine was used mainly for the mechanical treatment, as it was significant for indicating the relative quality or the competence of the ...
Recycled Coarse Aggregates in Concrete: A Comprehensive …
In this study, the properties of recycled concrete aggregate (RCA) materials are meticulously examined using scanning electron microscopy (SEM). …
Prediction of properties of recycled aggregate concrete using machine …
Recycled aggregates include coarse recycled aggregates (CRA) with a typical particle size range of 4.75–31.5 mm and fine recycled aggregates (FRA) between 0.16 and 4.75 mm [27]. Since RA obtained from CDW contains hardened cement paste or mortar and the surface of RA is rough, many micro-cracks will be generated during the …
Recycled aggregates New life for construction waste
What are recycled aggregates good for? Unprocessed crushed concrete and slag are particularly suitable for road construction, embankments, foundations and bulk fills. But …
Use of recycled aggregate concrete in structural members: a …
This article presents a comprehensive review on the use of recycled concrete aggregate (RCA) and recycled aggregate concrete (RAC) in construction, …