PAVEMENT PROBLEMS CAUSEDBY COLLAPSIBLE SUBGRADESBy Sandra L. Houston,1 Associate Member, ASCE(Reviewed by the Highway Division)ABSTRACT: Problem subgrade materials consisting of collapsible soils are com-mon in arid environments, which have climatic conditions and depositional andweathering processes favorable to their formation. Included herein is a discussionof predictive techniques that use commonly available laboratory equipment andtesting methods for obtaining reliable estim
