Sieve analysis test on 400 gm of sand was conducted with the following records; 200 Sieve No. pan 8 14 28 35 70 100 2.362 1.168 0.589 0.417 0.295 0.147 0.074 Diameter (mm) Mass retained (gm) 18 30 A 60 Total Retained (gm) 60 % finer 100 72 160 B 85 60 42 30 48 62 280 342 360 390 C D 10 2.5 a. What of the values of A, B, C and D. b. Determine the grading characteristics of this soil. c. Classify this soil according to its gradation using USCS method.

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Asphalt Binders and Mixtures

Asphalt binders are subsidiary products procured during the refining process of petroleum while manufacturing gasoline, diesel, and similar petroleum products. Asphalt binders are obtained from the residue that remains after the distillation of petroleum, this residue is further subjected to steam distillation and oxidation to remove the traces of gas oil present in the residue. Certain additives or modifiers are also added to asphalt binders to alter them to suit different applications.