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Research Report 213 Effect of additives on the frost-heave of a sub-base gravel

Publication Year

1989

Document Status

Current

Abstract

Many natural gravels classified as Type 2 sub-base materials in the Department of Transport Specification for Highway Works have adequate strength for roadmaking. However, some are unsuitable for use because they are frost-susceptible. Research was carried out on a frost-susceptible flint gravel to ascertain the effect of adding small amounts of hydrated lime, bentonite or Portland cement on the frost-heave of the material. The results showed that 2% of cement or bentonite reduced the frost-heave to almost zero, and the same proportion of hydrated lime reduced the frost-heave by about a half. Tests were also carried out which verified that the additives at these levels did not reduce the strength of the material.

Publisher Information

Transport Research Laboratory

The Transport Research Laboratory (TRL) is an internationally recognised organisation providing research, consultancy, testing and certification for all aspects of transport.

Crowthorne House
Nine Mile Ride
Wokingham
TRL
UK

Website: http://www.trl.co.uk/
Email: enquiries@trl.co.uk
Tel: 01344 773131