The laboratory test data for a modified Proctor test and CBR test for (crushed limestone) are given below; Find the CBR valuc at 95% of MDD after necessary corrections, for the tested sample depending on Iraqi Specifications, R6 (after drawing the curve and stating your answer about which sort of sub-bases materials are used in highway construction?- Table 1: CBR test data @56 blows! 56 Blows 2 25-3 Penetration(mm) 00.5 11.5 4 5 15 10 12.5 Load (Kg) 0 15 40 85 140 220 300 455 611 959 1120 1100 Table 2: MDD and CBR values for 10, 25 and 56 blows No. of Blows 10 25 56 MDD, gm/cm 1.95 2.07 2.2 CBR% 24 29 ? CBR% at 95% MDD

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Bituminous Materials

The word 'bituminous' in Bituminous materials come from the word bitumen, which is popularly known as 'asphalt' in the United States. Asphalt is a heavier substance that is obtained by the fractional distillation of crude oil, after removing the lighter components such as gasoline and diesel. Asphalts are known to have good adhesive and waterproofing properties. Depending upon the grade needed, asphalt may be refined several times in the fractional distillation column.