Abstract
Two methods involving thermal desorption and pyrolysis gas chromatography-mass spectrometry are described for the determination of two durability-enhancing admixtures, a corrosion inhibitor and a shrinkage reducing agent (SRA) in hardened portland cement mortar and concrete. The corrosion inhibitor, based on calcium nitrite, is selectively measured by the in situ pyrolytic conversion of 2-aminobiphenyl to 2-phenylphenol. The SRA, which consists of a mixture of isomeric glycol and ether compounds, can be thermally desorbed directly from powdered concrete. For both durability-enhancing agents, the recovery rate generally exceeds 93% with no interference evident from several common chemical admixtures. Cement composition does not appear to significantly affect desorption efficiency for the SRA additive. Thermal desorption and pyrolysis gas chromatography are shown to be rapid, selective, and highly convenient methods for both qualitative and quantitative estimates of two important chemical admixtures.
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