Find the mix proportion of mixing two sample of coarse aggregate with one sample of sand. The grading of the coarse aggregate is 5-50 mm and the other is 5-20 mm. The grading of the mixture should meet the requirements of the standard shown in the table below: % passing (Sand) % passing (gravel 2) Sieve No. % passing (gravel 1) Standard requirements 50 100 100 100 100 40 100 100 100 95-100 20 100 99 13 45-80 10 100 33 35-65 5 99 2 25-50 2.36 76 19-43 1.18 58 14-37 0.6 40 8-30 0.3 12 4-8 0.15 2 0-6 pan

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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.