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How Aggregates Prevent Frost Heave

Published Tuesday, July 01, 2003

Has global warming eliminated the need to consider frost heave in cold climates? I think not. After several warm winters, last winter showed that long cold spells could return to damage roadbeds, shallow foundations and slabs on grade. Aggregate Base Courses provide the primary pavement layer designed to prevent heaving and displacement due to prolonged freezing and frost penetration into subgrade soils. Frost heave in soils and in improperly designed aggregate base layers can be a major destructive force in deteriorating pavements and structures. It is essential that any subgrade soil or subbase with silt-size fines be protected ...

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