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Corrosion of Hardened Cement Paste by NH4NO3 and Acetic and Formic Acids

Published online by Cambridge University Press:  22 February 2011

Adolf Bajza
Adolf Bajza*
Affiliation:
Slovak Technical University, Bratislava, Czechoslovakia
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Abstract

Effects of NH4NO3, CH3COOH and HCOOH solutions on the pore structure and other properties of hardened cement pastes made out of portland, slag, and fly ash cements at different water-to-cement ratios are discussed.

Total porosity and the volume of pores detectable by mercury intrusion porosimetry (MIP) increased with increasing water-to-cement ratio, concentration of aggressive solution, and time of immersion. The weight, bulk density, and compressive strenath of the samples decreased at the same time. Use of blended cements did not result in improvement of the long-term durability of the samples. The degradation of the cement pastes increased from NH4NO3 to CH3COOH to HCOOH.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 137: Symposium P – Pore Structure and Permeability of Cementitious Materials , 1988 , 325
Copyright
Copyright © Materials Research Society 1989

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