Wstępna ocena reaktywności alkalicznej kruszyw łamanych ze złóż polodowcowych rejonu północnej Polski

Abstract

There is a large accumulation of gravel-sand aggregates of glacial origin in the north-eastern part of Poland. Crushed aggregates produced by crushing pebbles have particularly good quality parameters. So far the aggregates have not been precisely identified in terms of the alkali-aggregate reaction. The first step in evaluating the reactivity of aggregates is to carry out a detailed petrographic evaluation on the basis of which the reactive forms of silica can be identified. The paper presents selected results of tests carried out on the glacial crushed aggregates and a petrographic characterization of the latter, with special attention paid to the presence of the minerals which can react with sodium and potassium hydroxides.