Limitations of Köch-Steinegger test to evaluate the durability of cement pastes in acid medium

descriptionPublicationkeyboard_double_arrow_right Article 01 Dec 1999 English Publisher:Elsevier BVJournal:Cement and Concrete Research, volume 29, pages 2,005-2,009 (issn: 0008-8846,

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Authors: Macías, Ángeles; Goñi Elizalde, Sara; Madrid, Julio;

doi: 10.1016/s0008-8846(99)00196-9

handle: 10261/216083

Limitations of Köch-Steinegger test to evaluate the durability of cement pastes in acid medium

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Abstract

The durability of ordinary Portland cement and ground granulated blast furnace slag pastes in buffered acetic/acetate medium (pH 4.5) was studied by means of the Köch-Steinegger test. Results show that flexural strength measurement is not a good parameter to evaluate the degradation degree of cement paste in acid medium because two effects take place with opposite consequences on flexural strength as a result of acid attack: a densification of the cement paste in the specimen core and a degradation of the outer surface with loss of resistance.

The authors are grateful to CICYT for financial assistance (project AMB93-0022 and AMB96-0451).

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Keywords

Acid attack, Granulated blast furnace slag-cement paste, Pore solution, Durability

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