UNIT-III DESIGN OF FLEXIBLE AND RIGID PAVEMENTS 1. What is the Equivalent Wheel load? (NOV/DEC 2019), (April/May 2015) To carry maximum load within the specified limit and to carry greater load, dual wheel, or dual tandem assembly is often used. Equivalent single wheel load (ESWL) is the single wheel load having the same contact pressure, which produces same value of maximum stress, deflection, tensile stress or contact pressure at the desired depth. This is a semi-rational method, known as Boyd and Foster method, based on the following assumptions: • Equalancy concept is based on equal stress; • Contact area is circular; • Influence angle is 45˚; and Soil medium is elastic, homogeneous, and isotropic half space. 2. What are the requirements of an Ideal Pavement? (Nov/Dec2019), (Nov/Dec2016) An ideal pavement should meet the following requirements: Sufficient thickness to distribute the wheel load stresses to a safe value on the subgrade soil, Structurally strong to withstand all types of stresses imposed upon it, Adequate coefficient of friction to prevent skidding of vehicles, Smooth surface to provide comfort to road users even at high speed, Produce least noise from moving vehicles, Dust proof surface so that traffic safety is not impaired by reducing visibility, Impervious surface, so that sub-grade soil is well protected, and Long design life with low maintenance cost.
DESIGN OF FLEXIBLE AND RIGID PAVEMENTS
May 06, 2023
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