Influence of Construction and Demolition Waste Incorporation in Concrete

Macedo, Antônio; Zanelato, Euzébio Bernabé; Manhães, A. L. F.; Azevedo, Afonso Rangel Garcez de; Marvila, Markssuel Teixeira; Alexandre, Jonas; Monteiro, Sérgio Neves; Petrucci, Lucio

doi:10.1007/978-3-030-36552-3_11

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…However, as from replacement level of 30% and 20%, respectively, the compressive, flexural and splitting tensile strength started to decline, which was ascribed due to the weak bonds of the recycled aggregates. Macedo et al (2020) investigated the use of CDW as a replacement for natural sand at the proportion of 50% and 100%. The latter concluded that the characterisation of the waste sand showed large volume of fines with low specific mass as compared to natural sand.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

A sustainable approach in using construction and demolition waste materials in concrete

Quedou¹,

Wirquin

Bokhoree

2021

WJE

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Purpose The purpose of this paper is to investigate the potential use of construction and demolition waste materials (C&DWM) as an alternative for natural fine aggregates (NFA), in view to solve the disposal problems caused due to landfills. In addition, to evaluate its suitability as a sustainable material, mechanical and durability properties have been performed on different proportions of concrete blending and the results recorded were compared with the reference concrete values. Design/methodology/approach In this research, the NFA were replaced at the proportion of 25%, 50%, 75% and 100% of C&DWM with a constant slump range of 130 mm–150 mm. This parameter will assess the consistency of the fresh concrete during transportation process. The characteristics of the end product was evaluated through various tests conducted on hardened concrete samples, namely, compressive strength, flexural strength, depth of penetration of water under pressure, rapid chloride penetration test, carbonation test and ultrasonic pulse velocity (UPV) test. All results recorded were compared with the reference concrete values. Findings The results demonstrated that the use of C&DWM in concrete portrayed prospective characteristics that could eventually change the concept of sustainable concrete. It was noted that the compressive and flexural strength decreased with the addition of C&DWM, but nevertheless, a continuous increase in strength was observed with an increase in curing period. Moreover, the increase in rapid chloride penetration and decrease in UPV over time period suggested that the concrete structure has improved in terms of compactness, thus giving rise to a less permeable concrete. The mechanical tests showed little discrepancies in the final results when compared to reference concrete. Therefore, it is opined that C&DWM can be used effectively in concrete. Originality/value This study explores the possible utilisation of C&DWM as a suitable surrogative materials in concrete in a practical perspective, where the slump parameter will be kept constant throughout the experimental process. Moreover, research on this method is very limited and is yet to be elaborated in-depth. This approach will encourage the use of C&DWM in the construction sector and in the same time minimise the disposal problems caused due to in landfills.

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Section: Mechanical Propertiesmentioning

confidence: 99%

A sustainable approach in using construction and demolition waste materials in concrete

Quedou¹,

Wirquin

Bokhoree

2021

WJE

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“…It has emerged as a significant construction material on a global scale [ 4 , 5 , 6 , 7 ]. Geopolymers are also known as amorphous alkali aluminosilicates and alkali-activated cement [ 8 , 9 , 10 , 11 , 12 , 13 ]. By activating aluminosilicates, such as rice husk ash (RHA), metakaolin (MK), slag (SG), and fly ash (FA) with an alkaline solution, geopolymer concrete can be created.…”

Section: Introductionmentioning

confidence: 99%

Application of Machine Learning Approaches to Predict the Strength Property of Geopolymer Concrete

Cao

Fang

et al. 2022

Materials

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Geopolymer concrete (GPC) based on fly ash (FA) is being studied as a possible alternative solution with a lower environmental impact than Portland cement mixtures. However, the accuracy of the strength prediction still needs to be improved. This study was based on the investigation of various types of machine learning (ML) approaches to predict the compressive strength (C-S) of GPC. The support vector machine (SVM), multilayer perceptron (MLP), and XGBoost (XGB) techniques have been employed to check the difference between the experimental and predicted results of the C-S for the GPC. The coefficient of determination (R2) was used to measure how accurate the results were, which usually ranged from 0 to 1. The results show that the XGB was a more accurate model, indicating an R2 value of 0.98, as opposed to SVM (0.91) and MLP (0.88). The statistical checks and k-fold cross-validation (CV) also confirm the high precision level of the XGB model. The lesser values of the errors for the XGB approach, such as mean absolute error (MAE), mean square error (MSE), and root mean square error (RMSE), were noted as 1.49 MPa, 3.16 MPa, and 1.78 MPa, respectively. These lesser values of the errors also indicate the high precision of the XGB model. Moreover, the sensitivity analysis was also conducted to evaluate the parameter’s contribution towards the anticipation of C-S of GPC. The use of ML techniques for the prediction of material properties will not only reduce the effort of experimental work in the laboratory but also minimize the cast and time for the researchers.

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Influence of Construction and Demolition Waste Incorporation in Concrete

Cited by 2 publications

References 8 publications

A sustainable approach in using construction and demolition waste materials in concrete

A sustainable approach in using construction and demolition waste materials in concrete

Application of Machine Learning Approaches to Predict the Strength Property of Geopolymer Concrete

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