Q/1 A hollow box beam ABCD is supported at A by a pin that passes through the beam as shown in the figure. The beam is also supported by a roller located at B. The beam dimensions are a = 2.5 ft, b = 5.5 ft, and c = 3.5 ft. Two equal concentrated loads of P 2,750 lb are placed on the beam at points C and D. The beam has a wall thickness t= 0.375 in., and the pin at A has a diameter of 0.750 in. Determine: (a) the average shear stress in the pin at A. (b) the average bearing stress in the box beam at A. Вох Вeam Вох Вeam io Pin B D Support at 4

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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.