The degree and the effect of the incorporation of air polluting agents (primarily S02 and NOz) into concrete was investigated, partly by case studies (old concrete structures in chemical- industrial zones or on busy highways), and partly by laboratory tests, on paste and mortar specimens made of different cements and subjected to different atmospheres. Results indicate considerable increase of sulfates in the external layers of' concrete structures. Highest sulfate uptake (and lowest pH) was observed in case of concrete incorporating blastfurnace slag.
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