a. Explain the following quality control procedures for subgrade compaction; Proof rolling In situ CBR i) b. The correlation between California Bearing Ratio and DCP number is given by Log CBR = 2.628 1.273 log DCP (Kleyn and Van Harden) where DCP = penetration mm/biow. Find the CBR value of of the layer and determine whether stabilisation is necessary. TABLE I: DCP DATA Na, of blows Pemetration (mm) 22 44 69 104 129 154 b. The correct temperature during production, transportation, and laying is an important contribution to the overal quality of the asphaltic concrete. Explain this statement and the consequences for non- compliance.