Suitability of Synthetic Aggregates Made from Clay-Type Soils for Use in Flexible Base

摘要

The investigation was conducted to determine the limiting range of natural soils which can be fired to produce aggregates suitable for use in flexible base materials. The findings of the limited study are listed below: (1) The clay materials, montmorillonite, illite, and kaolinite will not rehydrate under atmospheric conditions once they are completely dehydrated. They become chemically stabilized for use as highway construction materials. Complete dehydration can be accomplished by heating the clay to 1400 F for a period of 15 minutes. (2) Incomplete dehydration of aggregates made by dehydrating clay-type soils can be detected by a relatively simple laboratory test. (3) Most clay-type soils having a relatively high strength when air-dried can be fired to produce hard, durable aggregate suitable for use in flexible base and asphaltic concrete. (Author)