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Waste materials can act as substitutes of concrete components; it is estimated that plastic and glass can replace fine aggregates in concrete mixes by up to 20%, while waste concrete could make up for 20% of the coarse aggregate mixes in concrete . Recycling one kg of aluminum as building demolition waste can contribute to …
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This study aims to propose a modified design method of RAC based on aggregate gradation readjustment (AGR). It tries to maintain the effective amounts of both the coarse and fine aggregates of RAC similar to that of the NAC after concrete mixing as it is well known that due to the weakness of the old attached mortar to RA, the gradation …
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The mechanical, environmental and economic aspects of RAC were integrated to evaluate the most sustainable concrete, which may be appropriate for varied concrete applications. 25 mixes were prepared by replacing natural coarse aggregate with recycled concrete aggregate (RCA) at mass ratios of 0%, 25%, 50%, 75% and , …
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roughly 70% of CDW can be classified as concrete [1,2]. During recycling of CDW, the waste concrete is crushed and processed into three different classes of aggregates: coarse recycled concrete aggregate (coarse RCA, particulate size >4.75 mm); fine RCA (par-ticulate size between 0.075 and 4.75 mm); and recycled concrete
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This paper investigates the properties of steam cured recycled aggregate concrete (RAC), in an attempt to determine the optimum conditions of the steam-curing cycle for RAC, and incorporating …
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In this study, coarse aggregates extracted from waste concrete were used as recycled coarse aggregates in a concrete mixture. Such durability properties of concrete samples as water absorption, porosity, and electrical resistance as corrosion evaluation indicators were assessed.
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Most of the steel mills in Bangladesh use induction furnace which produces large quantities of slags that have very little use except land filling. Therefore, feasibility of using this slag is examined in concrete with recycled aggregate, which is another waste product that is generated due to removal of old structures. Concrete with three target …
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The model could be further harvested to achieve sustainable concrete with optimal recycled aggregate content, least cost, and least environmental footprint. Studies on using ML techniques for ...
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The recycled aggregate concrete is made by mixing 60% of recycled aggregates with 40% of crushed stone chips. The aggregates used for concrete batching are maintained at saturated surface dry condition . The workability of the recycled aggregate concrete is slightly lower than that of the conventional concrete. ...
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1.3. Mixing Proportions and Specimens Preparation. The mix design is considered as the model variable, following the requirements of the response surface method, w/c, and the amount of the recycled coarse aggregates (Table 3).In this study, cylindrical and cubical concrete specimens have been prepared with 0, 20, 50, 70, and …
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Presently, different types of waste materials and industrial byproducts such as recycled concrete aggregate, glass, ceramic, fly ash, slag, etc., are being used with and without natural aggregates and ordinary Portland …
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Abstract Recycled aggregate concrete (RAC) contributes to mitigating the depletion of natural aggregates, alleviating the carbon footprint of concrete construction, and …
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The main reason for selecting a SCC mix that issues related to workability and aggregate gradation could be emphasized with a SCC mix. ... (68.4 %) was divided into 37.6 % coarse aggregate (crushed lime stone) and 30.8 % fine aggregate based on the optimization of packing density of normal weight fine and coarse aggregates used …
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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 aggregates ...
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This work is devoted to the study of fresh and hardened properties of concrete containing recycled gravel. Four formulations were studied, the concrete of reference and three concretes containing recycled gravel with 30, 65 and 100 % replacement ratios. All materials were formulated on the basis of S4 class of flowability …
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A common practice in concrete mixture optimization procedures is to consider the concrete production cost function as the objective function [19–21]. Moreover, the current stringent
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Five different concrete mixes were produced; three recycled aggregate concrete viz with 50%, 75% and recycled aggregates with fly ash, and two natural aggregate concrete mixes with and without fly ash, respectively. Triple mixing method was adopted for making of recycled aggregate concrete.
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This paper investigates the mechanical properties of concrete containing recycled aggregates and fly ash as a sustainable and eco-friendly solution for …
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Keywords: Recycled Aggregate Concrete, performance predicting model, intelligent multi-objective optimization, optimal design of mix ratio Suggested Citation: Suggested Citation Wu, Di and Yao, Xiao-Jun, Optimal Design of Mix Ratio for Recycled Aggregate Concrete by Performance Predicting Model and Intelligent Multi-Objective …
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The main aim of this paper was to optimize recycled aggregate concrete mixture with recycled masonry aggregate for structural utilization to find an efficient …
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Abstract. This paper analyzes the possibility of applying the Compressible Packing Model (CPM) for the proportion of concrete mixtures produced with Recycled …
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Abstract. 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 …
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Contribute to naicha22/2022 development by creating an account on GitHub.
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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 …
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The recycled concrete aggregate did not affect the compressive strength of recycled concrete in comparison with natural concrete for both strength classes. The mix-design method adopted (i.e. CPM) proved to be appropriated for the composition of recycled concrete mixtures with the same mechanical behavior as natural concretes.
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After demolition of old roads and buildings, the removed concrete is often considered worthless and disposed of as demolition waste. By collecting the used concrete and breaking it up, recycled concrete aggregate (RCA) is created (Fig. 1).This paper focuses on coarse RCA which is the coarse aggregate from the original concrete that is …
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Construction recycled material is crucial for protecting natural resources and promoting sustainable human development in a rapidly industrializing world. Many administrations worldwide accepted that it is beneficial to use demolition waste in the concrete building industry to reduce manufacturing costs and minimize the use of …
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Abstract. Recycled aggregate concrete (RAC) contributes to mitigating the depletion of natural aggregates, alleviating the carbon footprint of concrete construction, …
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recycled concrete aggregate (RCA,) i. e., when no percentage of recycled concrete aggregate in the concrete mixture was coated. The conclusion was that it was due to the high absorption of the RCA. Since concrete is a mixture of different components, in this work, it was necessary to find a method which will not only be precise in measuring
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Replacing natural aggregates with recycled aggregates obtained from the concrete waste of non-conforming elements is suited to manufacturing recycled concrete using replacement rates of 50% and . The cost analysis for a real industrial building applying the different dosing options studied shows that a cost reduction of up to 17.8% …
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The modeling and optimization of concrete compressive strength produced by replacing natural aggregate (NA) with recycled coarse aggregate (RCA) and recycled asphalt pavement (RAP) aggregates was investigated. The materials used were cement, water, fine aggregate, and coarse aggregate (NA, RCA, and RAP). The RCA and RAP replaced …
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The paper presents the optimization of concrete mixtures made with recycled aggregate. The optimization is defined regarding the concrete properties that could be modeled as second-order functions using response surface method and …
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This study intends to evaluate high and low-strength concrete mixes made with high volume of fly ash (FA) and recycled concrete aggregates (RCA) from both a mechanical and economic point of view. For this purpose, the mechanical characteristics of concrete, namely compressive strength (fcm), splitting tensile strength (fctm), and …
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In addition to the control mixture, six mixtures were produced with two proportions of recycled concrete aggregate or multi-recycled concrete aggregate (30% and 70%).
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