Question

The CBR values are generally calculated for penetrations of __________

(a) 2.5mm and 5mm

(b) 5mm and 7mm

(c) 7mm and 9mm

(d) 9mm and 10mm

The question was asked in an online quiz.

My enquiry is from Flexible Pavement topic in portion Design of Flexible & Rigid Pavement of Geotechnical Engineering II

Answer 1

The correct answer is (a) 2.5mm and 5mm

The best explanation: The CBR values are generally calculated for penetrations of 2.5 mm and 5 mm. This can be related from the graph of load and penetration which shows linear variation of penetration with the applied loads.