Use of concrete fine fraction waste as a replacement of Portland cement

Oliveira, Thays Car Feliciano de; Dezen, Bianca G.S.; Possan, Edna

doi:10.1016/j.jclepro.2020.123126

Cited by 61 publications

(32 citation statements)

References 29 publications

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“…In terms of technology, many materials in CDW can be reused as renewable resources after being sorted, shredded, or removed. For example, CDW can be used as an ecofriendly alternative in the production of eco-efficient cement [9]. In terms of management, construction materials are wasted due to a lack of basic technical and labor knowledge, poor material handling, poor material quality, and other reasons.…”

Section: Introductionmentioning

confidence: 99%

Considering Consumers’ Green Preferences and Government Subsidies in the Decision Making of the Construction and Demolition Waste Recycling Supply Chain: A Stackelberg Game Approach

et al. 2022

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Resource utilization of construction and demolition waste (CDW) is regarded to be an important means of achieving the sustainable development of the economy and the environment. However, previous research has not fully considered the green degree of products in the demand function of CDW remanufactured products. This study aimed to clarify how consumers’ green preferences and government subsidies affect decision making in the supply chain. First, a CDW resource utilization supply chain model composed of building materials manufacturers and retailers was constructed using consumer behavior theory. Second, the optimal decision making of members under conditions of decentralized and centralized decision making was analyzed using the Stackelberg game solution. Finally, the validity of the model and conclusions were verified by numerical simulation. The main conclusions are as follows. Government subsidies have a different impact on the pricing of new building materials products and CDW remanufactured products. Under decentralized decision making, the optimal profit of the CDW resource utilization supply chain with government subsidies is higher. However, under centralized decision making, the optimal profit is also related to consumers’ green preferences. According to consumers’ green preferences, choosing different decision-making models can not only improve the total profit of the CDW resource utilization supply chain, but also improve the reuse rate of CDW.

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Section: Introductionmentioning

confidence: 99%

Considering Consumers’ Green Preferences and Government Subsidies in the Decision Making of the Construction and Demolition Waste Recycling Supply Chain: A Stackelberg Game Approach

et al. 2022

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“…It is also employed in structural concrete [29,30]. Moreover, the concrete's fine fraction from construction and demolishing (C&D) waste can be utilized as a partial replacement of cement [31]. This results in the reduction in cement demand, and the problems raised from the production and use of cement are controlled.…”

Section: Introductionmentioning

confidence: 99%

Split Tensile Strength Prediction of Recycled Aggregate-Based Sustainable Concrete Using Artificial Intelligence Methods

et al. 2022

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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 for concrete materials. Using advanced artificial intelligence (AI) approaches, this study anticipates the split tensile strength (STS) of concrete samples incorporating RA. Three machine-learning techniques, artificial neural network (ANN), decision tree (DT), and random forest (RF), were examined for the specified database. The results suggest that the RF model shows high precision compared with the DT and ANN models at predicting the STS of RA-based concrete. The high value of the coefficient of determination and the low error values of the mean absolute error (MAE), mean square error (MSE), and root mean square error (RMSE) provided significant evidence for the accuracy and precision of the RF model. Furthermore, statistical tests and the k-fold cross-validation technique were used to validate the models. The importance of the input parameters and their contribution levels was also investigated using sensitivity analysis and SHAP analysis.

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“…• as secondary raw material in the production of cement and concrete, depending not only on the composition, but also on the granulometry (Oliveira et al, 2020); • for the production of geopolymers, incorporating CDW as either inert aggregates or partially reactive materials (Panizza et al, 2018); • in acid correction in soil and freshwater in polluted areas, which can be of interest whenever, such as in this work, CDW is duly separated and characterized, while it encounters difficulties otherwise (Staunton et al, 2014), and providing that there is no presence of heavy metals; • in mining areas of sulphide ore deposits, for the correction of Acid Mine Drainage (AMD), commonly carried out using limestones, which however could be partially substituted by CDW of similar composition due to its high Calcite content (Yilmaz et al, 2018).…”

Section: Applicationsmentioning

confidence: 99%

Mineralogical and chemical characterization of CDW as function of particle size and thermal treatments for potential recycling

et al. 2021

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Construction and Demolition Waste (CDW) originating from the rubble produced by the 2016 seismic events in the Marche Region (Central Italy) has been studied, focusing on its mineralogical and chemical characteristics, to investigate its recycling potentials as a component for eco-sustainable building material or in the glass industry. The aim was to obtain a full characterization of the behaviour of this material at high T in order to determine the most advantageous conditions for vitrification, considered as an effective process for volume reduction as well as for immobilization of potentially hazardous elements. Vitrification experiments, carried out with thermal treatments as function of temperature/duration/particle size and aimed at amorphization, were carried out under atmospheric conditions, at different temperatures (1000-1250°C) and durations (2-8 hours). The study demonstrated that mineralogical composition remains homogeneous for grainsize <4 mm, thus suggesting that no sieving is necessary for recycling of the fine fractions, which are the most difficult to treat. Vitrification, although not achieved for the CDW sample up to 1250°C, due to high-Ca and low-Si contents, demonstrated that this CDW can produce an interesting refractory material and a porous/insulating material. However, experiments showed that full vitrification can be easily achieved by mixing urban waste glass and CDW, suggesting applications in the glass industry. Based on the chemical and mineralogical features of the products, other significant upgrading alternatives of recycling the CDW in different fields of applications are highlighted.

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Use of concrete fine fraction waste as a replacement of Portland cement

Cited by 61 publications

References 29 publications

Considering Consumers’ Green Preferences and Government Subsidies in the Decision Making of the Construction and Demolition Waste Recycling Supply Chain: A Stackelberg Game Approach

Considering Consumers’ Green Preferences and Government Subsidies in the Decision Making of the Construction and Demolition Waste Recycling Supply Chain: A Stackelberg Game Approach

Split Tensile Strength Prediction of Recycled Aggregate-Based Sustainable Concrete Using Artificial Intelligence Methods

Mineralogical and chemical characterization of CDW as function of particle size and thermal treatments for potential recycling

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