Ecotoxicity and Essential Properties of Fine-Recycled Aggregate

Mariaková, Diana; Mocová, Klára Anna; Fořtová, Kristina; Ryparovà, Pavla; Pešta, Jan; Pavlů, Tereza

doi:10.3390/ma14020463

Cited by 11 publications

(16 citation statements)

References 32 publications

(69 reference statements)

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“…The alkaline pH of concrete leachates decreases after dilution with neutral or acidic water, and the decrease is easier when electrical conductivity is relatively low [ 37 ], which was observed for all concrete mixes in this study. The lower conductivity of the leachates, indicating decreased leachability, was most possibly caused by the relatively low surface area of the concrete cubes, in comparison with the homogenized samples [ 30 , 37 ], as well as with the glass materials GG and MWG.…”

Section: Resultsmentioning

confidence: 99%

“…The concentrations of the leachates exposed to test organisms were selected in our previous work [ 30 ]. The original leachates of both glass materials and concrete mixes usually caused lethality or a high degree of growth inhibition ( Figure 4 ), most likely due to a lack of nutrients.…”

Section: Resultsmentioning

confidence: 99%

“…Based on the chemical results and previous research [ 3 , 16 , 23 , 30 ], the concrete mixture containing photovoltaic glass was modified. Due to the specific chemical composition of the photovoltaic glass, which was verified in the recent experiments, the adaptation of the mixture was necessary to allow further testing of this mixture.…”

Section: Methodology and Materials Characterizationmentioning

confidence: 99%

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Waste Glass Powder Reusability in High-Performance Concrete: Leaching Behavior and Ecotoxicity

et al. 2021

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This paper deals with the possibility of using different types of waste glass powder in high-performance concrete (HPC) mixtures as a fine fraction replacement. Subsequently, both fractions are used in this research in concrete as a substitute for fine sand and silica flour. To use waste glass in a basic building material such as concrete, it is necessary to verify the basic chemical properties of the selected waste materials. Apart from the basic chemical properties, its environmental impact also appears to be an essential property of waste materials in general. Therefore, the research is mainly focused on the leaching and ecotoxicity experiments on high-performance concrete. HPC mixtures are designed based on the results of the analyzed chemical properties and previous research performed by our research team. Ecotoxicity of these concretes is then verified using Czech standards to evaluate. The results showed a positive impact on the ecotoxic properties of waste glass when used in concrete. A new ecotoxicity classification of waste materials and concrete mixes containing waste materials is proposed as a result of this research and summarized in the conclusion of this paper.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodology and Materials Characterizationmentioning

confidence: 99%

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Waste Glass Powder Reusability in High-Performance Concrete: Leaching Behavior and Ecotoxicity

et al. 2021

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“…Such a large amount of waste concrete is usually placed in landfills and roadbed backfills and not effectively utilized, which is not only a waste of resources but also greatly damages the environment and goes against the path of sustainable development [ 3 , 4 ]. Therefore, researchers at home and abroad have conducted prospective research on the application of waste concrete in construction [ 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 ], e.g., making recycled aggregates and geopolymers from waste concrete [ 14 , 15 , 16 ]. The geopolymer is a new environmentally friendly material that can replace cement in construction.…”

Section: Introductionmentioning

confidence: 99%

The Durability of Recycled Fine Aggregate Concrete: A Review

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et al. 2022

Materials

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With the rapid development of urbanization, many new buildings are erected, and old ones are demolished and/or recycled. Thus, the reuse of building materials and improvements in reuse efficiency have become hot research topics. In recent years, scholars around the world have worked on improving recycle aggregates in concrete and broadening the scope of applications of recycled concrete. This paper reviews the findings of research on the effects of recycled fine aggregates (RFAs) on the permeability, drying shrinkage, carbonation, chloride ion penetration, acid resistance, and freeze–thaw resistance of concrete. The results show that the content of old mortar and the quality of recycled concrete are closely related to the durability of prepared RFA concrete. For example, the drying shrinkage value with a 100% RFA replacement rate is twice that of normal concrete, and the depth of carbonation increases by approximately 110%. Moreover, the durability of RFA concrete decreases as the RFA replacement rate and the water–cement ratio improve. Fortunately, the use of zeolite materials such as fly ash, silica fume, and meta kaolin as surface coatings for RFAs or as external admixtures for RFA concrete had a positive effect on durability. Furthermore, the proper mixing methods and/or recycled aggregates with optimized moisture content can further improve the durability of RFA concrete.

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“…Four fine RAs were studied by Mariaková et al [ 32 ], and half of them, which present higher pH levels, were classified as toxic. The authors also claim that the use of waste materials in concrete compositions leads to the immobilisation of toxic elements.…”

Section: Introductionmentioning

confidence: 99%

Ecotoxicity of Recycled Aggregates: Application of a Prediction Methodology

et al. 2022

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Due to environmental concerns, the search for sustainable construction solutions has been increasing over the years. This global concern is creating a trend in the use of recycled aggregates resulting from construction and demolition wastes from different sources. In addition to their physical and mechanical properties, it is important to analyse their ecotoxicological risk to determine whether their leachates might be an issue. To assess ecotoxicity, biological tests should be performed for different trophic levels. This type of test is expensive and needs a high level of expertise, which leads to a lack of studies on recycled aggregates including ecotoxicity analysis. This paper presents a set of predictive ecotoxicity results based on the published studies on recycled aggregates. These results are the outcome of applying an innovative methodology previously developed and validated by the authors aiming to foresee the ecotoxicological fate of building materials’ constituents and products. The application of this methodology enables the classification of a recycled aggregate product as safe or unsafe in terms of ecotoxicity risk, while keeping biological testing to a minimum.

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Ecotoxicity and Essential Properties of Fine-Recycled Aggregate

Cited by 11 publications

References 32 publications

Waste Glass Powder Reusability in High-Performance Concrete: Leaching Behavior and Ecotoxicity

Waste Glass Powder Reusability in High-Performance Concrete: Leaching Behavior and Ecotoxicity

The Durability of Recycled Fine Aggregate Concrete: A Review

Ecotoxicity of Recycled Aggregates: Application of a Prediction Methodology

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