The Role of Parent Concrete in Recycled Aggregate Concrete

Pani, Luisa; Francesconi, Luca; Rombi, James; Stochino, Flavio

doi:10.1007/978-3-030-58820-5_28

Cited by 7 publications

(6 citation statements)

References 26 publications

(18 reference statements)

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“…Interestingly, the concrete compressive strength increases and then decreases with the increase in basalt fiber dosage. This may because when the concrete subjected to external pressure, the fibers can effectively absorb and disperse the energy and delay the generation and expansion of cracks, which is beneficial to improving the compressive strength of concrete [22][23][24]. Therefore, an increase in the basalt fiber dosage at the initial stage leads to an increase in the compressive strength of concrete.…”

Section: Analysis and Discussion Of Bfrac Properties Based On Rsm Mod...mentioning

confidence: 99%

Mixture ratio optimization of basalt fiber recycled aggregate concrete based on RSM

Li,

Sun

2024

Mater. Res. Express

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In this paper, the effects of W/B ratio, recycled aggregate (RA) content and basalt fiber (BF) dosage on the compressive strength, splitting tensile strength and slump of concrete were investigated and a regression model was developed for analysis and prediction, and the regression model was validated using ANOVA and confidence analysis. Statistical analysis revealed that W/B ratio, RA content and BF dosage had significant effects on all properties of concrete. The established regression model fits the experimental data well and can accurately predict the properties of concrete. It was also found that there was a significant interaction between W/B ratio and BF dosage, as well as RA content and BF dosage, which suggests that the combination of these factors should be considered in the design of concrete mix to achieve optimum performance. The predicted values of compressive strength, split tensile strength and slump of concrete under optimum proportioning were in good agreement with the experimental values. Therefore, optimizing the concrete proportion by response surface methodology can improve the testing efficiency and obtain basalt fiber recycled aggregate concrete that meets the design requirements and has better overall performance.

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Section: Analysis and Discussion Of Bfrac Properties Based On Rsm Mod...mentioning

confidence: 99%

Mixture ratio optimization of basalt fiber recycled aggregate concrete based on RSM

Li,

Sun

2024

Mater. Res. Express

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“…The coarse aggregates formed while crushing PC15 are more like natural aggregates since the bond between the mortar and aggregates is weak. The interface was significantly cleaner, with less adhered mortar, as noticed by [5], which increased the bond in the new mix. As a consequence, the compressive strength of the RAC significantly increased.…”

mentioning

confidence: 84%

“…This task necessitates the use of massive volumes of raw materials in concrete, road construction, and engineering fill, which harms the natural environment [3,4]. Concrete debris, which is generated by the demolition of old buildings and seismic disasters, has somehow been overlooked as a source of aggregate [5]. This waste is disposed as trash.…”

Section: Introductionmentioning

confidence: 99%

Effect of parent concrete strength on recycled concrete performance

Kebaili

Benzerara

Menadi

et al. 2022

Frattura Ed Integrità Strutturale

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The reuse of concrete waste as a secondary aggregate could be an efficient solution for sustainable development and long-term environmental protection. However, the variable quality of waste concrete, especially with various compressive strengths, can have a negative effect on the final compressive strength of recycled concrete. In this approach, the major goal of this research is to study the effect of parent concrete qualities on the performance of recycled concrete. To accomplish this task, three grades of different compressive strengths (10 to 15) MPa, (20 to 25) MPa, and (30 to 40) MPa have been analyzed in an experimental test program, in which an unknown compressive strength is introduced as well. The experimental mix use 40% of secondary aggregates (both course and fine) and 60% of natural aggregates. This led to the decreasing of the compressive strength of the test concrete between 14% and 23.7% compared to the normal concrete. This loss was improved by adding an amount of cement equivalent to 4% of the weight of the recycled aggregate used. The achieved results prove that the strength properties of the parent concrete have a limited effect on the compressive strength of the recycled concrete. Additionally, low compressive strength parent concrete, when crushed, generates a high amount of fine aggregate and large percentage of recycled coarse aggregates with less attached mortar, and presents the same compressive strength as an excellent parent concrete.

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“…Recycled concrete is not only beneficial to reduce the pollution caused by construction waste to the environment, but also to relieve the burden of resource exploitation to the environment. The cost of recycled concrete with the same strength is lower than that of ordinary concrete (Qiao et al, 2018;Weglorz et al, 2018;Xiong et al, 2018;Pani et al, 2020). • The road surface is in direct contact with the external environment and bears the driving load, meanwhile, it is also subjected to the rain erosion and the temperature change of freezing-thawing alternation, which puts forward higher requirements for the performance of concrete (Liu et al, 2019;Hoai-Bao and Quoc-Bao, 2021).…”

Section: Introductionmentioning

confidence: 98%

Development of hybrid SVM-FA, DT-FA and MLR-FA models to predict the flexural strength (FS) of recycled concrete

Wang

Zhou

2023

Front. Mater.

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Recycled concrete from construction waste used as road material is a current sustainable approach. To provide feasible suggestions for civil engineers to prepare recycled concrete with high flexural strength (FS) for the road pavement, the present study proposed three hybrid machine learning models by combining support vector machine (SVM), decision tree (DT) and multiple linear regression (MLR) with the firefly algorithm (FA) for the computational optimization, named as SVM-FA, DT-FA, and MLR-FA, respectively. Effective water-cement ratio (WC), aggregate-cement ratio (AC), recycled concrete aggregate replacement ratio (RCA), nominal maximum recycled concrete aggregate size (NMR), nominal maximum normal aggregate size (NMN), bulk density of recycled concrete aggregate (BDR), bulk density of normal aggregate (BDN), water absorption of RCA (WAR) and water absorption of NA (WAN) were employed as the input variables. To determine the predicting results of varying hybrid models, root mean square error (RMSE) and correlation coefficient (R) were used as performance indexes. The results showed that the SVM-FA demonstrated the highest R values and the lowest RMSE values, and the fitting effect of the predicted values and the actual values of the FS of recycled concrete is the best. All the above analysis proving that the SVM optimized by FA hyperparameters has the highest prediction accuracy and SVM-FA can provide engineers a more accurate and convenient tool to evaluate the FS of recycled concrete. The results of sensitivity analysis showed that WC has the most significant influence on the FS of recycled concrete, while RCA has the weakest influence on the FS, which should be noticed when engineers apply recycled concrete to road design in the future.

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The Role of Parent Concrete in Recycled Aggregate Concrete

Cited by 7 publications

References 26 publications

Mixture ratio optimization of basalt fiber recycled aggregate concrete based on RSM

Mixture ratio optimization of basalt fiber recycled aggregate concrete based on RSM

Effect of parent concrete strength on recycled concrete performance

Development of hybrid SVM-FA, DT-FA and MLR-FA models to predict the flexural strength (FS) of recycled concrete

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