Binding and leaching of trace elements in Portland cement pastes

Vollpracht, Anya; Brameshuber, Wolfgang

doi:10.1016/j.cemconres.2015.08.002

Cited by 92 publications

(35 citation statements)

References 23 publications

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“…The third group of Portland clinker components (<0.1% of total mass) comprises trace elements, such as arsenic, barium, cadmium, chromium, copper, zinc, nickel, and lead. Trace metals may be introduced to the cement not only from raw materials, but also during cement production process, mainly during clinker burning . Nowadays, waste material is commonly used in cement kilns as a fuel.…”

Section: Introductionmentioning

confidence: 99%

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Estimation of Pollutants Leaching from Cement Coating to Water After Pipe Renovation Based on Laboratory Experiments

Młyńska

Zielina

2019

CLEAN Soil Air Water

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Despite the fact that water pipes renovation using cement coatings has many advantages, directly after its application, the quality of the transported water may deteriorate. This is mainly due to the dissolution and leaching of some chemical elements from the protective coatings into the water. The necessity of meeting drinking water quality requirements enforces the provision of an appropriate flushing time of the freshly cemented water pipes before their return to re‐use and adjusting the length of the once‐renovated pipe. In this paper, the comparison and verification of pollutants leaching from cement mortar coatings in static and dynamic conditions are performed. Based on the experimental research performed under laboratory conditions, the curves describing the dependence of leaching pollutants from the cement mortar coating on the diameter and length of the freshly cemented water pipe are elaborated. Leaching graphs allow for forecasting some drinking water quality parameters changes soon after the water main renovation. The performed calculations for the freshly cemented transit pipeline connecting the intake of drinking water from the Dobczyce Reservoir to Cracow City have shown that the risk of exceeding the limitation values for aluminum, chromium, and lead concentration in water at the end of the renovated pipeline is very small for the type of cement commonly used in renovations – CEM I.

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Section: Introductionmentioning

confidence: 99%

“…Trace metals may be introduced to the cement not only from raw materials, but also during cement production process, mainly during clinker burning. [20,21] Nowadays, waste material is commonly used in cement kilns as a fuel. Traditional fuels used in traditional kilns include coal, oil, petroleum coke, and natural gas.…”

Section: Introductionmentioning

confidence: 99%

Estimation of Pollutants Leaching from Cement Coating to Water After Pipe Renovation Based on Laboratory Experiments

Młyńska

Zielina

2019

CLEAN Soil Air Water

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“…The chemical structure of calcium sulfate enables the attachment of mono-or divalent ions (both anions and cations). Sulphoalumiantes enable chromium to be incorporated into their structure by replacing the sulphate group [1,12,19]. The worst immobilization properties for both test methods are performed by the composition of fly ashlime cement (CEM II/C 30% V+10% LL).…”

Section: The Influence Of New Cement Type Compositions On the Immobilmentioning

confidence: 99%

“…The present trend in the use of alternative fuels and waste materials in cement and concrete production may increase the risk of contamination of final products ( Fig.1 1) [1][2][3][4]. Such activities raise some doubts due to the impact of such materials on the environment.…”

Section: Introductionmentioning

confidence: 99%

Leaching of heavy metals from cementitious composites made of new ternary cements

Kuterasińska-Warwas

Król

2017

E3S Web Conf.

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Abstract. The paper presents a comparison of research methods concerning the leaching of harmful substances (selected heavy metal cations ie. Pb, Cu, Zn and Cr) and their degree of immobilization in cement matrices. The new types of ternary cements were used in the study, where a large proportion of cement clinker was replaced by other non-clinker components -industrial wastes, ie. siliceous fly ash from power industry and granulated blast furnace slag from the iron and steel industry. In studied cementitious binders also ground limestone was used, which is a widely available raw material. The aim of research is determining the suitability of new cements for neutralizing harmful substances in the obtained matrices. The application of two research methods in accordance with EN 12457-4 and NEN 7275 intends to reflection of changing environmental conditions whom composite materials may actually undergo during their exploitation or storing on landfills. The results show that cements with high addition of non-clinker components are suitable for stabilization of toxic substances and the obtained cement matrices retain a high degree of immobilization of heavy metals at the level of 99%.

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“…Solidification/stabilization of toxic elements (e.g. Zn, Pb, Co, Cu, Cr Cd, Mn) in various types of cementations matrices (lime, cement, geopolymers etc) were assessed by leaching tests [9,11,20,21,[12][13][14][15][16][17][18][19].…”

mentioning

confidence: 99%

Influence of a Chromium-rich Industrial Waste on the Hydration and Hardening Processes of Portland Cements with Slag and Limestone Additions

Oproiu¹,

Pârvan²,

Voicu³

et al. 2020

Rev. Chim.

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This research work assesses the influence of a chromium-rich waste (from potassium dichromate manufacture) on the hydration and hardening processes of two types of Portland cements with limestone filler and slag additions. Therefore, mixtures of Portland cement and chromium-rich waste, corresponding to 0.5% wt. and 1% wt. Cr, were prepared and tested. The analyses performed on cement pastes with chromium waste content, showed that chromium immobilization is mainly due to the formation of Ca6Al2Cr3O18�32H2O (CrEt); this compound results by the substitution of [SO4]2- groups from ettringite lattice of with [CrO4]2-. CrEt crystals growth on the surface of clinker particles forms a diffusion barrier which explains longer setting times for cements with chromium content. The increase of chromium content in the studied systems decreases the compressive strength values but these remain above the lower limits imposed for this type of materials. The chromium content in leachates prepared according to the method described in SR EN 12457-2, was well below the legal limit of 70 mg/Kg established by Romanian legislation. A better chromium immobilisation was achieved in the cement with slag content, in good correlation with the nature and amount of formed hydrates.

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Binding and leaching of trace elements in Portland cement pastes

Cited by 92 publications

References 23 publications

Estimation of Pollutants Leaching from Cement Coating to Water After Pipe Renovation Based on Laboratory Experiments

Estimation of Pollutants Leaching from Cement Coating to Water After Pipe Renovation Based on Laboratory Experiments

Leaching of heavy metals from cementitious composites made of new ternary cements

Influence of a Chromium-rich Industrial Waste on the Hydration and Hardening Processes of Portland Cements with Slag and Limestone Additions

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