THAUMASITE NON-SULPHATE ATTACK AT AMBIENT TEMPERATURE AND PRESSURE

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Architecture, Civil Engineering, Environment

Silesian University of Technology

Subject: Architecture, Civil Engineering, Engineering, Environmental

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ISSN: 1899-0142

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VOLUME 10 , ISSUE 3 (September 2017) > List of articles

THAUMASITE NON-SULPHATE ATTACK AT AMBIENT TEMPERATURE AND PRESSURE

Barbara SŁOMKA-SŁUPIK / Adam ZYBURA

Keywords :  Ammonium chloride, Concrete corrosion, Portland cement, Slag cement, Thaumasite formation, TSA

Citation Information : Architecture, Civil Engineering, Environment. Volume 10, Issue 3, Pages 73-80, DOI: https://doi.org/10.21307/acee-2017-036

License : (BY-NC-ND 4.0)

Published Online: 28-August-2018

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ABSTRACT

One of the products of concrete sulphate corrosion, besides gypsum and ettringite, is thaumasite. The thaumasite is a very dangerous, non binding crystalline phase, which is forming at the expense of C-S-H phase. There was a conviction that the conditions required for the formation of thaumasite in concrete are: source of calcium silicate, sulfate ions, carbonate ions and a very wet, cold (below 15°C) environment. The corrosion of concrete caused by the external source of sulphate ions during which thaumasite is formed was called thaumasite sulphate attack (shortly TSA).While the TSA is recognized, the thaumasite non-sulphate attack (T n S A ) must be highlighted, because is also possible. The purpose of this work is to show that thaumasite, or solid solutions of Ett-Th (ettringite with thaumasite) are able to form in hardened cement paste without external source of sulphate ions, at ambient temperature and pressure (25±2°C (298.15 K) and 102±1 kPa). The experiment appeared on thaumasite formation in corroded specimen made of CEM I (Portland cement) and of CEM III (slag cement) after 4 days of immersion in saturated water solution of NH4Cl.

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REFERENCES

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