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Abstract:This is a progress report on Phase 2 of a study entitled "Synthetic Aggregate Research" being conducted by the Texas Transportation Institute. This phase deals specifically with synthetic aggregates for use in flexible base, and its primary objective is to develop acceptance criteria for such aggregates. It was initiated in 1966, after non-bloated, fired-clay aggregates had been used experimentally in flexible base on several Texas highways. To the author's knowledge, fired-clay aggregates are at present the only synthetic aggregates that are economically feasible for use in flexible base. Therefore, all research efforts so far have been directed toward evaluating this type of aggregate. All research results to date are favorable to the use of fired-clay aggregates in flexible base. The results indicate that these aggregates have great potential for use in highway construction in the many areas of the world where high quality aggregates no longer exist, but where the clays required for the production of synthetic aggregates are plentiful.
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