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Decalcification of activated paper sludge – Fly ash-Portland cement blended pastes in pure water

Goñi, S. / Frías, M. / Vigil de la Villa, R. / Vegas, I.

Abstract Decalcification in pure water of ternary Portland cement (TPC) pastes, containing thermally activated paper sludge and fly ash, has been evaluated from the leaching of Ca²⁺ in pure water at the temperature of 20°C during 90days. Monitoring of calcium loss showed that the leaching kinetics are controlled by diffusion. The degradation of the material over time is estimated from the calcium effective diffusivity. A similar study of plain ordinary Portland cement (OPC) pastes was carried out for comparison. The results showed lower effective diffusion coefficients of calcium in the case of the TPC pastes. This behaviour is related to its microstructure, which is denser than that of OPC as a result of the pozzolanic activity of both additions.

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Decalcification of activated paper sludge – Fly ash-Portland cement blended pastes in pure water

Goñi, S. / Frías, M. / Vigil de la Villa, R. / Vegas, I.

Abstract Decalcification in pure water of ternary Portland cement (TPC) pastes, containing thermally activated paper sludge and fly ash, has been evaluated from the leaching of Ca²⁺ in pure water at the temperature of 20°C during 90days. Monitoring of calcium loss showed that the leaching kinetics are controlled by diffusion. The degradation of the material over time is estimated from the calcium effective diffusivity. A similar study of plain ordinary Portland cement (OPC) pastes was carried out for comparison. The results showed lower effective diffusion coefficients of calcium in the case of the TPC pastes. This behaviour is related to its microstructure, which is denser than that of OPC as a result of the pozzolanic activity of both additions.

Decalcification of activated paper sludge – Fly ash-Portland cement blended pastes in pure water

Goñi, S. / Frías, M. / Vigil de la Villa, R. / Vegas, I.

Abstract Decalcification in pure water of ternary Portland cement (TPC) pastes, containing thermally activated paper sludge and fly ash, has been evaluated from the leaching of Ca²⁺ in pure water at the temperature of 20°C during 90days. Monitoring of calcium loss showed that the leaching kinetics are controlled by diffusion. The degradation of the material over time is estimated from the calcium effective diffusivity. A similar study of plain ordinary Portland cement (OPC) pastes was carried out for comparison. The results showed lower effective diffusion coefficients of calcium in the case of the TPC pastes. This behaviour is related to its microstructure, which is denser than that of OPC as a result of the pozzolanic activity of both additions.

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Title:

Decalcification of activated paper sludge – Fly ash-Portland cement blended pastes in pure water

Contributors:

Goñi, S. (author) / Frías, M. (author) / Vigil de la Villa, R. (author) / Vegas, I. (author)

Published in:

Cement and Concrete Composites ; 40 ; 1-6

Publication date:

2013-04-06

Size:

6 pages

ISSN:

DOI:

https://doi.org/10.1016/j.cemconcomp.2013.04.002

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

Keywords:

Leaching of calcium , Pure water , Ternary Portland cement (TPC) , Plain ordinary Portland cement (OPC) , Pore-size distribution , Scanning electron microscopy (SEM)

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