Alkali-aggregate Reactivity of Ferronickel-Slag Aggregate Concrete


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Title: Alkali-aggregate Reactivity of Ferronickel-Slag Aggregate Concrete

Author(s): F. Tomosawa, S. Nagataki, T. Kajiwara and M. Yokoyama

Publication: Special Publication

Volume: 170


Appears on pages(s): 1591-1602

Keywords: Alkali-aggregate reactions; blast furnace slag; fine aggregates; fly ash; slags.

Date: 7/1/1997

Ferronickel slag is a by-product produced when refining ferronickel from nickel ores. Investigations were conducted for a long time to use this hard slag as aggregate in concrete, and it was standardized in October 1992 as JIS A 5011 (Slag aggregate for concrete). However, one of the types produced in Japan was excluded from the standard, as it was alkali-aggregate reactive. The authors applied various measures specified in other standards to suppress reactivity of this type of ferronickel-slag aggregate, and experimentally confirmed that the following measures are effective: (i) the use of low-alkali cement, (ii) addition of fly ash, and (iii) addition of ground granulated blast-furnace slag.