The application of waste materials in concrete is gaining more popularity for sustainable development. The adaptation of this approach not only reduces the environmental risks but also fulfills the requirement of concrete material. This study used the novel algorithms of machine learning (ML) to forecast the splitting tensile strength …Web

This study intends to develop a sustainable strategy for selection of recycled aggregate concrete (RAC) through a series of experiments and using multi-criteria decision-making (MCDM) techniques. The mechanical, environmental and economic aspects of RAC were integrated to evaluate the most sustainable concrete, which may …Web

Cost to produce recycled concrete aggregate range from £5 to £12 per tonne. The cost depends on the quantity, the quality of demolished concrete, and the size and type of …Web

The use of alternative materials and recycling in construction has gained popularity in recent years as part of the industry’s commitment to sustainability. One such material, recycled aggregates, has been extensively studied over the past two decades for its potential to replace natural aggregates in cement-based composites. …Web

Many previous studies have successfully used recycled concrete aggregate (RCA) in the production of concrete and mortar [3], ... This study estimated the compressive strength of recycled concrete using six machine learning approaches, including GB, XGB, SVR, GB_PSO, XGB_PSO, and SVR_PSO. The input parameters …Web

The use of recycled aggregate concrete can save natural resources and reduce environmental pollution, which has been widely concerned in recent years. ... it is found that [32] RCCA is affected by the strength of the original concrete, crushing machine, and crushing degree, and the quality and content of old mortar of recycled aggregate …Web

March 14, 2023. 1. 9033. Crushing and Screening Equipment for Concrete Recycling. There are two approaches to recycling concrete. One approach is to haul the concrete debris to a permanent recycling facility or quarry for crushing and screening. The alternative is to crush and screen the material at the demolition site.Web

This study provides a comprehensive review on recycled aggregate (RA) and recycled aggregate concrete (RAC) regarding their history, recycling, reuse and …Web

DNN was used to predict the compressive strength in recycled concrete [20,36,56,[63][64] [65] [66][67]; the input parameters were water-cement ratio, recycled coarse aggregate replacement ratio ...Web

PSTSMA method improve up to 6.35% the strength of recycled aggregate concrete made up of recycled aggregate at 28 days respectively w.r.t. Normal Mixing Approach(NMA).Web

From the perspective of sustainable development, recycling waste concrete to produce recycled concrete aggregate (RCA) can effectively reduce harm to the environment [2,3]. ... Then RCA was ground by a machine. The combination of heating and grinding treatment improved the apparent density of RCA by 4.67% at 600 °C. However, …Web

Natural aggregate (NA) can be replaced by recycled concrete aggregate (RCA) in the construction industry, which can solve the problem of construction waste disposal and reduce the gap between demand and supply. ... Machine learning (ML) models considering the influence of multicollinearity can realize the multi objective optimization of ...Web

This debris is then picked up and dumped into the top of the concrete recycling machine, from which it falls into a crushing impactor, which as the name suggests, crushes the concrete into small pieces known as recycled concrete aggregate (RCA). Depending on the size of RCA that the concrete recycler is looking to create, the …Web

Geopolymer concrete (GC) has the potential to incorporate recycled concrete aggregates (RCA) obtained from construction and demolition waste. This research aims to review the current state-of-the-art knowledge of the RCA in GC and identify the existing knowledge gaps for future research direction. This paper highlights the essential …Web

A concrete mixture available in the literature (Poon et al., 2004) is chosen and natural fine aggregate, natural coarse aggregate and both natural fine and coarse aggregate are replaced with recycled fine aggregate, recycled coarse aggregate and recycled fine and coarse aggregate, respectively in a range of 0–90% with the step of …Web

Currently, one method of recycling waste concrete is to crush, clean, and grade waste concrete to obtain recycled aggregate particles. The particles with a size less than 4.75 mm after crushing ...Web

Using recycled aggregate in concrete is one of the best ways to reduce construction pollution and prevent the exploitation of natural resources to provide the needed aggregate. However, recycled aggregates affect the mechanical properties of concrete, but the existing information on the subject is less than what the industry needs. Compressive …Web

19.2.1 Recycled concrete aggregate (RCA) Coarse RCA complies to the requirements of maximum 5% masonry content, 5% fine materials, 0.5% lightweight material, 5% asphalt, 1% foreign material and 1% acid soluble sulfate, and is suitable for use in concrete as per BS 8500-2 (2006). In designated concrete RC20/25 to RC40/50, RCA can automatically ...Web

Recycled aggregate concrete without fly ash and GGBS began to lose mass after 25 freeze and thaw cycles. However, the independent or simultaneous replacement of fly ash and GGBS in 50% replaced recycled aggregate concrete delayed the mass loss rate only after 150 freeze and thaw cycles . Similar research on durability …Web

The recycled aggregate is an alternative with great potential to replace the conventional concrete alongside with other benefits such as minimising the usage of natural resources in exploitation to produce new conventional concrete. Eventually, this will lead to reducing the construction waste, carbon footprints and energy consumption. This paper aims to study …Web

This research has used 16 concrete mix designs containing 0.1, 0.3, and 0.5% steel fiber (SF), and 20, 30, 40, 50, and 60% copper slag (CS) to examine their fresh and hardened characteristics, and ...Web

The adoption of recycled-aggregate concrete has gained traction in response to increasing environmental concerns, meeting the demands of the construction industry. ... Modeling the mechanical properties of recycled aggregate concrete using hybrid machine learning algorithms. Resour Conserv Recycl, vol. 190 (2023), 10.1016/j.rnrec.2022.106812.Web

Figure 1. Waste concrete for recycling: concrete cubes and precast column. Figure 2. Recycled material after (a) primary and (b) secondary crushing. Crushed concrete particles were separated into standard fractions of coarse aggregate (4–8 mm, 8–16 mm and 16–31.5 mm), as seen in Figure 3. Figure 3.Web

Sustainable concrete is gaining in popularity as a result of research into waste materials, such as recycled aggregate (RA). This strategy not only protects the environment, but also meets the demand …Web

5 kinds of concrete recycling machines These 5 kinds of concrete recycling machines are mostly used and most popular equipment. The followings are the reasons why you can choose them …Web

With the sustainable development of the construction industry, recycled aggregate (RA) has been widely used in concrete preparation to reduce the environmental impact of construction waste. Compressive strength is an essential measure of the performance of recycled aggregate concrete (RAC). In order to understand the correspondence …Web

This paper presents the mechanical behaviour of concrete mixes made with recycled aggregate by replacing the natural aggregate with crushed concrete from pavement demolition. The purpose of this study was to determine the feasibility of using recycled aggregate from pavement demolition to make new concrete for pavement …Web

There is a growing need to find ways to reuse fine concrete waste from the construction industry. In this study, recycled concrete fines were granulated and used as lightweight aggregates. Ladle slag, a steel industry residue, was used as a co-binder in different ratios (0, 10, 20, and 30%). The materials were blended and granulated, and …Web

The recycled aggregate concrete has a compressive strength of at least 76% and modulus of elasticity from 60% to. Problem statement. ... based on machine learning. A database containing 176 circular and 126 rectangular RACFST samples was employed to assess the applicability of existing specification, and was then used to train …Web

In this study, the idea of recycling the concrete wastes and reuse of them for reproduction of green concrete has been presented. Thus, we have tried to study mechanical parameters using recycled aggregate concrete. For this purpose, three mix designs including natural, recycled and recycled fiber concrete were tested. Moreover, …Web

It involves breaking, removing, and crushing existing concrete into a material with a specified size and quality. See ACI 555 (2001) for more information on processing old concrete into recycled concrete …Web

Recycled aggregate concrete (RAC) contributes to mitigating the depletion of natural aggregates, alleviating the carbon footprint of concrete construction, and averting the landfilling of colossal amounts of construction and demolition waste. However, complexities in the mixture optimization of RAC due to the variability of recycled …Web

This study proposed the surrogate model to predict recycled aggregate concrete (RAC) creep behavior utilizing machine learning (ML). Both grid search …Web

Abstract. 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. Since the adhering cementitious paste weakens the adhesion between the aggregate and the binder, it becomes a decisive factor in the …Web

Construction and Demolition Waste (C&DW) is generated around the world and its quantity will increase in the future. Recycling has become the favored method of dealing with concrete waste but, to avoid its downcycling, it is important to develop a recycling process which is able to produce high-grade recycled concrete aggregates …Web

Mixture optimization of mechanical, economical, and environmental objectives for sustainable recycled aggregate concrete based on machine learning and metaheuristic algorithms. Author links open overlay panel Kaihua Liu a, Jiakai Zheng a, Shuxiong Dong a, Weili Xie a, ... Recycled aggregate concrete (RAC) has received …Web

Recycled aggregate concrete (RAC) has been acknowledged as an effective way to achieve green building and meet the sustainable development goal. ... Observational Analysis of Fire-Induced Spalling of Concrete through Ensemble Machine Learning and Surrogate Modeling. J. Mater. Civ. Eng., 33 (1) (2021), p. 04020428, …Web