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Patch testing discordance alert: false-negative findings with rubber additives and fragrances

E F Sherertz1, A F Fransway, D V Belsito

  • 1Department of Dermatology, Wake Forest University School of Medicine, Winston-Salem, NC, USA.

Journal of the American Academy of Dermatology
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PubMed

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Deleterious Substances in Aggregate01:25

Deleterious Substances in Aggregate

Deleterious substances in aggregates can be detrimental to the quality and durability of concrete. These substances include organic impurities like loam, which interfere with cement hydration and are usually present in the sand. These prevent a good bond between aggregate and cement paste. Organic impurities can be detected using the colorimetric test, where the darkness of a solution after agitation indicates the level of organic content.
Another type of impurity is clay and fine material that...