Of new tyres with good treads and worn-out tyres, which one gives higher friction factors in wet and dry condition respectively
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- RS-1K consists of bitumen, water and emulsifying agent. O True O FalseA 16mm dia. bar is used as longitudinal bars of a concrete pavement. It is spaced at 700 mm on center. The road of the roadway 9.20 meter and thickness of slab is 180mm. with the allowable bond stress of bar is 850 Kpa. Illustrate & determine the coefficient of friction of the slab on the subgrade if design length of the longitudinal bars 1.15 m. Assumed a 2400 kg. per cubic m of concrete.Determine the thickness of the flexible pavement for a wheel load of 50KN, if the allowable bearing pressure on the base of the pavement is 0.15MPa and the equivalent radius of the contact area of the tires is equal to 165mm. answer should be in mm.
- Question 1 a- Design the dowel bars for an expansion joint (Z = 0.5 in), the critical dowel will carry a load of 1700 Ib. What is the diameter (b') for the dowel bar, which will provide safe concrete the bearing stress? b- A9 in thick rigid pavement, having slabs 15 ft wide and 60 ft long subjected to a single tire load of 10 kips, 100psi. If (k = 110 pci, E = 4 * 106 psi, u= 0.15, et = 5 x 10-6 in/in/"F). The temperature difference between top and bottom were found to be 50° F (noon). 1. Calculate edge stress due to load? 2. Calculate edge stress due to Temperature?Compute the thickness of a flexible pavement for a wheel load of 55 kN, if the allowable bearing pressure on the base of the pavement is 0.15 MPa and the equivalent radius of the contact area of the tires is equal to 170 mm.Calculate the equivalent radius of the contact area of tires considering the wheel load is 60 kN.Allowable bearing pressure on the base of the pavement is approximately 0.20 MPa and thethickness of pavement is calculated as 160 mm. Round up the answer in 10 mm interval.
- A 100 N block slides down a 30° inclined plane. The plane is lubricated by a 2 mm thick film of oil of sp.gravity 0.80 and viscosity 10 poise. Contact area is 0.1m2, the terminal velocity of the block in m/s is V WHighway traffic loads,.A rigid pavement of 25 cm thickness of M40 grade of concrete is supported over a subgrade having modulus of subgrade reaction as 8.0 kg/cm³. If dowel bars are placed at centre-to-centre spacing of 30 cm, calculate the maximum load carried by a single dowel which is just below the wheel. Assume wheel load as 4100 kg, participation of dowel bars in load distribution up to 1.0 x radius of relative stiffness. and load to be transferred by joint as 50%. Poisson's ratio of the concrete may be taken as 0.15.
- Q2) On dry concrete, a car can decelerate at a rate of 7 m/s2, whereas on wet concrete it can decelerate at only 5 m/s2. Find the distances necessary to stop a car moving at 110 Km/h. (a ) on dry .concrete and (b) on wet concreteEvery information is correct. Please do it correctly or let other experts do it. Don't reject A tyre with 230 kPa air pressure distributes a load over an area with circular contact radius of 200 mm. The pavement was constructed with a material that has a modulus of elasticity of 450 MPa and a Poisson's ratio of 0.40. 1.1 Calculate the radial-horizo talking stress and deflection at a point on the pavement surface under the center of the tyre load. [Function values table: A 1 B-0 C-O R-0.5 H=2]Question Bank-Friction The two uniform sheets of plywood, each of length L and weight W, are propped as shown. If the coefficient of static friction is 0.5 at all three contact surfaces, determine whether the sheets will remain at rest. 60 Technolagy Druen by anontien Will the sheets be at rest? Yes or No? Yes Provide F/N PrtSc F5 FG F7 F8 F9 F10 F11 F12