Concrete Terminology » Z

zero-slump concrete—see concrete, zero-slump.

Zahn cup—an apparatus for the measurement of liquid or slurry viscosity expressed as the number of seconds required for the liquid or slurry to drain from the cup through a hole of definite diameter.

zinc-rich primer—a primer that contains a high enough concentration of zinc dust to make it electrically conductive when it dries so that it provides cathodic protection for ferrous materials.

zone, anchorage—in post-tensioning, the region adjacent to the anchorage subjected to secondary stresses resulting from the distribution of the prestressing force; in pretensioning, the region in which the transfer bond stresses are developed.

zone, precompressed—the area of a flexural member that is compressed by the prestressing tendons.

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