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STRENGTH OF BASES AND SUBBASES

C R Foster

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Abstract

THE RESULTS OF IN-PLACE CBR TESTS MADE AT VARIOUS HEIGHTS ABOVE THE SUBGRADE ARE REVIEWED TO DETERMINE IF THE CBR AT A GIVEN LEVEL IN AN UNTREATED MATERIAL IS A FUNCTION OF THE CBR OF THE UNDERLYING MATERIAL AND THE HEIGHT OF THE TEST ABOVE THE UNDERLYING LAYER. THE AUTHOR BELIEVES THAT THE WATER THAT THIN LAYERS OF BASE COLLECT AND HOLD WEAKENS THE SUBGRADE WITH THE RESULT THAT A PAVEMENT MADE WITH A TREATED BASE COURSE MAY BE STRUCTURALLY WEAKER IF A THIN CUSHION COURSE IS USED THAN IF THE TREATED BASE COURSE HAD BEEN PLACED DIRECTLY ON THE SUBGRADE.

About this research paper

What this paper is about

THE RESULTS OF IN-PLACE CBR TESTS MADE AT VARIOUS HEIGHTS ABOVE THE SUBGRADE ARE REVIEWED TO DETERMINE IF THE CBR AT A GIVEN LEVEL IN AN UNTREATED MATERIAL IS A FUNCTION OF THE CBR OF THE UNDERLYING MATERIAL AND THE HEIGHT OF THE TEST ABOVE THE UNDERLYING LAYER. THE AUTHOR BELIEVES THAT THE WATER THAT THIN LAYERS OF BASE COLLECT AND HOLD WEAKENS THE SUBGRADE WITH THE RESULT THAT A PAVEMENT MADE WITH A TREATED BASE COURSE MAY BE STRUCTURALLY WEAKER IF A THIN CUSHION COURSE IS USED THAN IF THE TREATED BASE COURSE HAD BEEN PLACED DIRECTLY ON THE SUBGRADE.

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Available abstract

THE RESULTS OF IN-PLACE CBR TESTS MADE AT VARIOUS HEIGHTS ABOVE THE SUBGRADE ARE REVIEWED TO DETERMINE IF THE CBR AT A GIVEN LEVEL IN AN UNTREATED MATERIAL IS A FUNCTION OF THE CBR OF THE UNDERLYING MATERIAL AND THE HEIGHT OF THE TEST ABOVE THE UNDERLYING LAYER. THE AUTHOR BELIEVES THAT THE WATER THAT THIN LAYERS OF BASE COLLECT AND HOLD WEAKENS THE SUBGRADE WITH THE RESULT THAT A PAVEMENT MADE WITH A TREATED BASE COURSE MAY BE STRUCTURALLY WEAKER IF A THIN CUSHION COURSE IS USED THAN IF THE TREATED BASE COURSE HAD BEEN PLACED DIRECTLY ON THE SUBGRADE.

Key concepts: Subgrade, Base course, Geotechnical engineering, Course (navigation), Base (topology), Cushion, Engineering, Structural engineering

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