Effect of brick waste content on mechanical properties of mixed recycled concrete

Xu, Liuxiong; Wu, Jin; Zhao, Xing; Yan, Pengpeng; Ji, Weiyi

doi:10.1016/j.conbuildmat.2021.123320

Cited by 33 publications

(5 citation statements)

References 43 publications

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“…According to Figure 5, it is clear that the slump values achieved by the RC and all RBA mixtures meet the slump design of 20±2 cm, which indicates that the workability of fresh concrete can be easily handled in the field. Other studies also found that the use of brick waste as coarse aggregates in concrete mixes increases the slump (24). The visual observation depicted in Figure 6 revealed that bleeding and segregation did not occur.…”

Section: Workabilitymentioning

confidence: 71%

Basic Engineering Properties of Concrete with Refractory Brick as Coarse Aggregate: Compressive Stress-Time Relationship Assessment

Jureje,

Tjaronge,

Caronge

2024

IJE

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This study aims to investigate the use of refractory brick (RBA) by-products as a substitute for coarse aggregate in sustainable concrete production. Concrete mixes with water-to-binder (w/c) ratios of 0.52 and 0.49 and containing 0%, 15%, 30%, and 50% RBA as a partial replacement for ordinary crushed stone (OCS) were produced. The following properties were examined in this study: workability, compressive strength, stress-time relationship, toughness index, performance criteria, and cost analysis. The test results showed that an increase in the RBA percentage in the concrete mixtures positively contributed to concrete workability. Moreover, the compressive strength and all phases in the compressive stress and time relationship decreased as the percentage of RBA in the concrete mixture increased. However, at 15%RBA, the toughness index value was comparable to that of the reference concrete, whereas based on the performance criteria, the replacement of OCS with 15%RBA for both water-cement ratios met the minimum requirements. Meanwhile, cost comparison analysis discloses that material and production costs can be reduced by approximately 51.84% and 1.5-6.5%, respectively. Based on the analysis of all the test results, 15%RBA exhibited insignificant differences in value compared with the reference concrete. Thus, the use of 15%RBA as an OCS replacement is an acceptable and viable option for producing sustainable concrete.

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Section: Workabilitymentioning

confidence: 71%

Basic Engineering Properties of Concrete with Refractory Brick as Coarse Aggregate: Compressive Stress-Time Relationship Assessment

Jureje,

Tjaronge,

Caronge

2024

IJE

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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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“…However, the value of cement mortar is relatively low when compared with other waste compositions [ 15 ]. This is because mortar waste is built with high porosity and water absorption rates that can weaken the strength and mechanical performance of recycled aggregates made by concrete waste [ 27 , 28 ]. Thus, we assume that the treatment process of recycling mortar waste is the same as that of concrete, and the value of recycled mortar is ignored.…”

Section: Literature Reviewmentioning

confidence: 99%

Estimating the Carbon Emission of Construction Waste Recycling Using Grey Model and Life Cycle Assessment: A Case Study of Shanghai

Wang

Liu

et al. 2022

IJERPH

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Great efforts have been exerted in reducing carbon emissions in design, construction and operation stages. However, little attention is paid to the quantification of carbon emissions in construction waste recycling at the end-of-life stage. This study aims to quantitatively analyze the carbon emission of construction waste in Shanghai City, PR China. A grey model is used to forecast the generation amount of construction waste, and a life cycle assessment is performed to estimate the carbon emission of construction waste. In this study, both the carbon emission of recycling activities (environmental costs), and the equivalent amount of carbon generated from alternative materials (environmental benefit) are considered. Here, recycling 1 ton (t) of construction waste in Shanghai can save 100.4 kg CO2−e. The total carbon-emission-saving potential can be increased from 0.31 million t CO2−e (2022) to 0.35 million t CO2−e (2031). The carbon emission of recycling concrete, brick, steel, wood and mortar, identified as the key components of construction waste, is investigated. This research can help to reduce carbon emissions and further achieve carbon neutrality for Shanghai City. The proposed methods can also be applied to other regions, especially when the data for construction waste are insufficient.

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Effect of brick waste content on mechanical properties of mixed recycled concrete

Cited by 33 publications

References 43 publications

Basic Engineering Properties of Concrete with Refractory Brick as Coarse Aggregate: Compressive Stress-Time Relationship Assessment

Basic Engineering Properties of Concrete with Refractory Brick as Coarse Aggregate: Compressive Stress-Time Relationship Assessment

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

Estimating the Carbon Emission of Construction Waste Recycling Using Grey Model and Life Cycle Assessment: A Case Study of Shanghai

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