Decalcification of cement paste in NH4NO3 solution: Microstructural alterations and its influence on the transport properties

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Decalcification of cement paste in NH4NO3 solution: Microstructural alterations and its influence on the transport properties. / Phung, Quoc Tri; Maes, Norbert; Jacques, Diederik; De Schutter, Geert; Ye, Guang.

Proceedings of The 10th fib International PhD Symposium in Civil Engineering. Canada, 2014. p. 179-187.

Research output: Contribution to report/book/conference proceedingsIn-proceedings paperpeer-review

Harvard

Phung, QT, Maes, N, Jacques, D, De Schutter, G & Ye, G 2014, Decalcification of cement paste in NH4NO3 solution: Microstructural alterations and its influence on the transport properties. in Proceedings of The 10th fib International PhD Symposium in Civil Engineering. Canada, pp. 179-187, 10th fib International PhD Symposium in Civil Engineering, Québec, Canada, 2014-07-21.

APA

Phung, Q. T., Maes, N., Jacques, D., De Schutter, G., & Ye, G. (2014). Decalcification of cement paste in NH4NO3 solution: Microstructural alterations and its influence on the transport properties. In Proceedings of The 10th fib International PhD Symposium in Civil Engineering (pp. 179-187).

Vancouver

Phung QT, Maes N, Jacques D, De Schutter G, Ye G. Decalcification of cement paste in NH4NO3 solution: Microstructural alterations and its influence on the transport properties. In Proceedings of The 10th fib International PhD Symposium in Civil Engineering. Canada. 2014. p. 179-187

Author

Phung, Quoc Tri ; Maes, Norbert ; Jacques, Diederik ; De Schutter, Geert ; Ye, Guang. / Decalcification of cement paste in NH4NO3 solution: Microstructural alterations and its influence on the transport properties. Proceedings of The 10th fib International PhD Symposium in Civil Engineering. Canada, 2014. pp. 179-187

Bibtex - Download

@inproceedings{331318d8afc1449bb13a4515d503a964,
title = "Decalcification of cement paste in NH4NO3 solution: Microstructural alterations and its influence on the transport properties",
abstract = "Leaching of cement-based materials changes its properties such as a reduction in pH, an increase in porosity and transport properties and a detrimental effect on properties related to long-term durability. Therefore, a better understanding of leaching process is important in long-term. In this study, an ammonium nitrate solution was used to accelerate the leaching. The experiments were on cement paste samples with different water/powder and limestone filler replacement ratios. The change of sample mass over time was monitored, and the amount of calcium ion leached out during the test was determined. Different post-analysis techniques like SEM, MIP and N2-adsorption were used to characterize the microstructural changes. The effect of accelerated leaching on transport properties was studied by measuring the change in water permeability. Results show that (i) NH4NO3 solution is an aggressive but suitable agent to be used to accelerate the Ca leaching while still keeping the “nature” of leaching; (ii) the square root-time law of degradation is applicable; (iii) the porosity increases significantly and the critical pore size is shifted to larger radius; and (iv) the BET specific surface area is also significantly increased. These changes result in a significant increase in permeability.",
keywords = "leaching, concrete, permeability, acceleration, microstructure",
author = "Phung, {Quoc Tri} and Norbert Maes and Diederik Jacques and {De Schutter}, Geert and Guang Ye",
note = "Score = 3; 10th fib International PhD Symposium in Civil Engineering ; Conference date: 21-07-2014 Through 23-07-2014",
year = "2014",
month = jul,
language = "English",
isbn = "978-2-9806762-2-2",
pages = "179--187",
booktitle = "Proceedings of The 10th fib International PhD Symposium in Civil Engineering",

}

RIS - Download

TY - GEN

T1 - Decalcification of cement paste in NH4NO3 solution: Microstructural alterations and its influence on the transport properties

AU - Phung, Quoc Tri

AU - Maes, Norbert

AU - Jacques, Diederik

AU - De Schutter, Geert

AU - Ye, Guang

N1 - Score = 3

PY - 2014/7

Y1 - 2014/7

N2 - Leaching of cement-based materials changes its properties such as a reduction in pH, an increase in porosity and transport properties and a detrimental effect on properties related to long-term durability. Therefore, a better understanding of leaching process is important in long-term. In this study, an ammonium nitrate solution was used to accelerate the leaching. The experiments were on cement paste samples with different water/powder and limestone filler replacement ratios. The change of sample mass over time was monitored, and the amount of calcium ion leached out during the test was determined. Different post-analysis techniques like SEM, MIP and N2-adsorption were used to characterize the microstructural changes. The effect of accelerated leaching on transport properties was studied by measuring the change in water permeability. Results show that (i) NH4NO3 solution is an aggressive but suitable agent to be used to accelerate the Ca leaching while still keeping the “nature” of leaching; (ii) the square root-time law of degradation is applicable; (iii) the porosity increases significantly and the critical pore size is shifted to larger radius; and (iv) the BET specific surface area is also significantly increased. These changes result in a significant increase in permeability.

AB - Leaching of cement-based materials changes its properties such as a reduction in pH, an increase in porosity and transport properties and a detrimental effect on properties related to long-term durability. Therefore, a better understanding of leaching process is important in long-term. In this study, an ammonium nitrate solution was used to accelerate the leaching. The experiments were on cement paste samples with different water/powder and limestone filler replacement ratios. The change of sample mass over time was monitored, and the amount of calcium ion leached out during the test was determined. Different post-analysis techniques like SEM, MIP and N2-adsorption were used to characterize the microstructural changes. The effect of accelerated leaching on transport properties was studied by measuring the change in water permeability. Results show that (i) NH4NO3 solution is an aggressive but suitable agent to be used to accelerate the Ca leaching while still keeping the “nature” of leaching; (ii) the square root-time law of degradation is applicable; (iii) the porosity increases significantly and the critical pore size is shifted to larger radius; and (iv) the BET specific surface area is also significantly increased. These changes result in a significant increase in permeability.

KW - leaching

KW - concrete

KW - permeability

KW - acceleration

KW - microstructure

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_136670

UR - http://knowledgecentre.sckcen.be/so2/bibref/11767

M3 - In-proceedings paper

SN - 978-2-9806762-2-2

SP - 179

EP - 187

BT - Proceedings of The 10th fib International PhD Symposium in Civil Engineering

CY - Canada

T2 - 10th fib International PhD Symposium in Civil Engineering

Y2 - 21 July 2014 through 23 July 2014

ER -

ID: 134274