Correlation analysis between sulphate content and leaching of sulphates in recycled aggregates from construction and demolition wastes

Barbudo, Auxi; Galvín, Adela P.; Agrela, Francisco; Ayuso, Jesús

doi:10.1016/j.wasman.2012.02.005

Cited by 74 publications

(46 citation statements)

References 25 publications

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“…The application of the proposed methodology to classify the materials under study in terms of hazard regarding the acceptance of solid waste at landfills and ecotoxicological potential allowed obtaining the results that are presented in Table 6. NA are considered VRM, which were previously classified as inert raw materials with no evidence of ecotoxicity (NOE) ( Table 6 and [21]); this result can be supported by the study of Barbudo et al [42]. According to the European regulation for Registration, Evaluation, Authorization and Restriction of Chemicals (REACH) [43], Portland cement is considered a well-defined mixture ( Table 1); it is in the RBPRM group of raw materials.…”

Section: Resultsmentioning

confidence: 78%

Evaluation of the Ecotoxicological Potential of Fly Ash and Recycled Concrete Aggregates Use in Concrete

et al. 2020

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This study applies a methodology to evaluate the ecotoxicological potential of raw materials and cement-based construction materials. In this study, natural aggregates and Portland cement were replaced with non-conventional recycled concrete aggregates (RA) and fly ash (FA), respectively, in the production of two concrete products alternative to conventional concrete (used as reference). The experimental program involved assessing both the chemical properties (non-metallic and metallic parameters) and ecotoxicity data (battery of tests with the luminescent bacterium Vibrio fischeri, the freshwater crustacean Daphnia magna, and the yeast Saccharomyces cerevisiae) of eluates obtained from leaching tests of RA, FA, and the three concrete mixes. Even though the results indicated that RA and FA have the ability to release some chemicals into the water and induce its alkalinisation, the respective eluate samples presented no or low levels of potential ecotoxicity. However, eluates from concrete mixes produced with a replacement ratio of Portland cement with 60% of FA and 100% of natural aggregates and produced with 60% of FA and 100% of RA were classified as clearly ecotoxic mainly towards Daphnia magna mobility. Therefore, raw materials with weak evidences of ecotoxicity could lead to the production of concrete products with high ecotoxicological potential. Overall, the results obtained highlight the importance of integrating data from the chemical and ecotoxicological characterization of materials’ eluate samples aiming to assess the possible environmental risk of the construction materials, namely of incorporating non-conventional raw materials in concrete, and contributing to achieve construction sustainability.

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Section: Resultsmentioning

confidence: 78%

Evaluation of the Ecotoxicological Potential of Fly Ash and Recycled Concrete Aggregates Use in Concrete

et al. 2020

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“…Sulfate in concrete can lead to loss of strengths and dimensional instability. For this reason, recycled aggregates with less than 4.4 % of gypsum and less than 30 % of ceramic particles could be used in nonstructural civil applications without potential risk to the environment [33]. The results of batch leaching test showed releases below limit values for both L/S ratio, except M2 waste whose release for L/S = 2 was higher.…”

Section: Inorganic Speciesmentioning

confidence: 99%

Leaching behavior of some demolition wastes

Saca

Dimache

Radu

et al. 2015

J Mater Cycles Waste Manag

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Demolition wastes may be used in different civil engineering applications as road constructions, concrete, and embankments or landfill. Regardless its application, leaching tests of the waste should be carried out to assess concentrations of pollutants. Concrete, brick and mixture of concrete, bricks, tiles and ceramics wastes were subject to percolation test-CEN/TS 14405, and batch test-SR EN 12457. The leachates were analyzed with respect to concentration of inorganic elements-arsenic, barium, cadmium, chromium, copper, mercury, molybdenum, nickel, lead, selenium, zinc, fluoride, chloride and sulfate, and organic compounds (phenol index). The concentrations of elements in leachates were compared with the limit values of European regulation for the acceptance of inert wastes at landfills. Generally, the releases of inorganic species in leachates were below limits values. Some waste leachates obtained by percolation and batch test had high values for phenol index.

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“…An indication would be to test the traces of heavy metals, TOC (total organic carbon), the phenol index (carboxyl, halogen, hydroxyl, methoxyl or sulfonic acid), NOx, SOx, and the pH. Regarding the recycled aggregates from CDW, Barbudo et al [91] concluded that aggregates from CDW are only susceptible to minimal heavy metal leaching. However, high concentrations of An established method to assess the risk of toxicity of construction materials is the quantification, using standard tests, of the possibility of leaching potentially harmful substances to the environment.…”

Section: Toxicity Of Raw Materials For Concretementioning

confidence: 99%

A Critical Review on the Influence of Fine Recycled Aggregates on Technical Performance, Environmental Impact and Cost of Concrete

Hafez

Kurda

et al. 2020

Applied Sciences

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The aim of this critical review is to show the applicability of recycled fine aggregates (RFA) in concrete regarding technical performance, environmental impact, energy consumption and cost. It is not possible to judge the performance of concrete by considering one dimension. Thus, this study focussed on the fresh and hardened (e.g., mechanical and durability) properties and environmental and economic life cycle assessment of concrete. Most literature investigated showed that any addition of recycled fine aggregates from construction and demolition waste as a replacement for natural fine aggregates proves detrimental to the functional properties (quality) of the resulting concrete. However, the incorporation of recycled fine aggregates in concrete was proven to enhance the environmental and economic performance. In this study, an extensive literature review based multi criteria decision making analysis framework was made to evaluate the effect of RFA on functional, environmental, and economic parameters of concrete. The results show that sustainability of RFA based concrete is very sensitive to transportation distances. Several scenarios for the transportation distances of natural and recycled fine aggregates and their results show that only if the transportation distance of the natural aggregates is more than double that of RFA, e the RFA based concrete alternatives would be considered as more sustainable.

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Correlation analysis between sulphate content and leaching of sulphates in recycled aggregates from construction and demolition wastes

Cited by 74 publications

References 25 publications

Evaluation of the Ecotoxicological Potential of Fly Ash and Recycled Concrete Aggregates Use in Concrete

Evaluation of the Ecotoxicological Potential of Fly Ash and Recycled Concrete Aggregates Use in Concrete

Leaching behavior of some demolition wastes

A Critical Review on the Influence of Fine Recycled Aggregates on Technical Performance, Environmental Impact and Cost of Concrete

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