Investigations on the leaching behavior of fresh concrete – A review

Overmann, Steffen; Lin, Xiaochen; Vollpracht, Anya

doi:10.1016/j.conbuildmat.2020.121390

Cited by 17 publications

(10 citation statements)

References 25 publications

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“…Concentrations of trace metals in polymer mortar leachates were consistently below the limits of quantification for most elements, i.e., As, Cd, Cr, Mo, Ni, Pb, Sb, Se, and Zn, which was in accordance with their low mobility in the sediment and the low porosity of monolithic samples. These results are in good agreement with previous work on asphalt mortar or hydraulically bounded materials [ 17 , 18 , 19 ]. The system product/water is characterized by two compartments in the exchange flows, i.e., the pore-water in the pores of the product and the leachate compartment.…”

Section: Resultssupporting

confidence: 93%

“…It is also possible to compare the leachability of the target substances from different construction products according to regulatory levels from the Netherlands (Soil Quality Decree, 2008) or Germany. These tests have often been used to characterize cementitious materials [ 17 , 18 ]. There is very little work on the characterization of waste-based material monoliths.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of Dynamic Surface Leaching of Monolithic Polymer Mortars Comprised of Wastes

et al. 2023

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Today, the reuse of waste in building materials occupies an important place in the approach to the circularity of materials. National and European environmental regulations require ensuring the environmental safety of material-incorporating waste. For this, there are specific tests to verify that there is no health risk when using these materials. Concretely, to check the environmental acceptability of construction materials, including wastes, the release of hazardous substances into water must be assessed. In this research, we performed a diffusion test with the sequential renewal of water during a 64-day period according to the NF EN 15863 specifications on polymer mortar monoliths, common construction products used in floor-covering applications and incorporating sediments. Polymer mortars were prepared at a laboratory scale by incorporating 30 or 50% of polluted sediment for various polymer concentrations (12, 14, 16, 18, 20 and 25%). It was shown that the release of inorganic substances is limited in these hydrodynamic conditions. Among trace elements, As, Cd, Cr, Ni, Pb and Zn are lower than quantification limits in most leachates, whereas Ba, Co, Cu and V are systematically quantified at low concentration levels. This is particularly true for samples displaying the highest polymer concentration (25%) and the lowest sediment incorporation rate (30%). This is because of the low water absorption level and low porosity of polymer mortar matrices. No adverse effect is to be expected for environmental health from the leachates of these construction materials, including waterways sediments, because all the measured parameters were below the Soil Quality Decree limits applied in the Netherlands for environmental assessment of construction products.

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Section: Resultssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Assessment of Dynamic Surface Leaching of Monolithic Polymer Mortars Comprised of Wastes

et al. 2023

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“…Besides the environmental impact caused by the production of raw materials and handling of demolition waste, it must be considered that potentially harmful substances can be leached from the materials during their service life because of their exposure to water in the form of rain, surface water or groundwater. Trace metals can also be leached out which can originate from natural or secondary raw materials or additives as well as from primary and secondary fuels used in the production process of cement [156]. Their release is dependent on different factors, e.g., the chemical composition of the leachate [157] and the binding mechanisms of the substances [158].…”

Section: Leaching and Ecotoxicologymentioning

confidence: 99%

“…At the beginning of hydration, there is no phase boundary between the water and the fresh cement paste, and soluble substances are not yet fixed in the hydration products. Therefore, it can be assumed that cementitious materials show a different leaching behavior in the fresh state and the leaching of the fresh material should be investigated separately [156].…”

Section: Leaching and Ecotoxicologymentioning

confidence: 99%

Crumb Rubber in Concrete—The Barriers for Application in the Construction Industry

Kara De Maeijer,

Craeye,

Blom

et al. 2021

Infrastructures

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This state-of-the-art review was aimed to conduct a comprehensive literature survey to summarize experiences of crumb rubber (CR) application in concrete within the last 30 years. It shows that certain gaps prevent obtaining a coherent overview of both mechanical behaviour and environmental impact of crumb rubber concrete (CRC) to object to the stereotypes which prevent to use of CR in concrete in the construction industry. Currently, four major barriers can be distinguished for a successful CR application in the concrete industry: (1) the cost of CR recycling, (2) mechanical properties reduction, (3) insufficient research about leaching criteria and ecotoxicological risks and (4) recyclability of CRC. The application of CR in concrete has certainly its advantages and in general cannot be ignored by the construction industry. CR can be applied, for example, as an alternative material to replace natural aggregates and CRC can be used as recycled concrete aggregates (RCA) in the future. A certain diversity for the CR application can be introduced in a more efficient way when surface treatment and concrete mix design optimization are properly developed for each type of CR application in concrete for possible field applications. The role of CRC should not be limited to structures that are less dependent on strength.

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“…Leaching is one of the degradation phenomena that occur in concrete or cement-based composites. Leaching is one of the main factors that change the mechanical properties of cement-based composites [15][16][17][18][19]. The deterioration process known as "leaching" in the cement paste occurs due to contact with pure water or water with a low pH, which encourages the hydrolysis of hydrates [20].…”

Section: Introductionmentioning

confidence: 99%

The Leaching Behavior of Pervious Mortar Used as Water Filter in Rural Areas

Yogafanny

2023

GEOMATE

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Many people in rural areas use freshwater, including irrigation water for domestic purposes. The pervious mortar filter (PMF) is a modification of mortar and pervious concrete, designed as an alternative water filter to improve the natural water quality for domestic use. According to its physical characteristics (pore structure and geometry), pervious mortar can be a filter to reduce several types of pollutants in the water. On the other hand, based on its chemical characteristics, pervious mortar can be dissolved if passed by certain types of water for an extended period, called leaching. This study aims to determine the leachability of pervious mortar filters by identifying the influent and effluent concentration of calcium ion (Ca 2+ ), hardness, pH, and total dissolved solids (TDS) in two types of water sources, i.e., pure water and irrigation water. This study analyzes the leachability of the filter by the filter column experiment method. The leaching is analyzed by the water's pH, TDS, calcium ion (Ca 2+ ), and hardness concentration before and after the water is filtered by PMF. The filtered water for each specimen was 50 liters (L). 50 L of pure water showed increased pH, TDS values, Ca 2+ concentration, and hardness in the effluent. The increase in pH, TDS, Ca 2+ , and hardness concentration in the effluent with irrigation water was less than the increase of the same parameter in PMF through pure water.

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Investigations on the leaching behavior of fresh concrete – A review

Cited by 17 publications

References 25 publications

Assessment of Dynamic Surface Leaching of Monolithic Polymer Mortars Comprised of Wastes

Assessment of Dynamic Surface Leaching of Monolithic Polymer Mortars Comprised of Wastes

Crumb Rubber in Concrete—The Barriers for Application in the Construction Industry

The Leaching Behavior of Pervious Mortar Used as Water Filter in Rural Areas

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