Design of Flexible Airport Pavements

Design of Flexible Airport Pavements

Introduction The structure of an airport flexible pavement may consist of untreated or treated (stabilized) granular base overlain by an impervious or waterproofing riding course much in the same way as with flexible highway pavements. However, it is recommended that whenever possible, flexible airport pavements must be constructed as full-depth asphalt pavements as such a …

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Structural Design of Flexible Highway Pavements

Design of Flexible Highway Pavements

Basis for design A flexible pavement is a structure composed of one or more layers of bound or unbound materials with or without a bituminous surfacing. Since the intensity of stresses from traffic loads diminishes with depth the conventional form of construction for a flexible pavement is a layered system in which the quality of …

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Quality Control of Road Works in Ghana

Hence, quality control of road works in Ghana is very crucial.

Introduction In Ghana, road works whether new development or maintenance, are generally executed by contracting.  Hence, quality control of road works in Ghana is very crucial. A contract is a legal agreement between two parties where one party agrees to carry out certain works in return for a reward (or in legal terms a consideration …

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Maintenance of Roads [ All you need to know]

Maintenance of Roads [ All you need to know]

Introduction to Road maintenance Maintenance of roads is an intervention measure designed to arrest the deterioration of a road and to restore the service condition to the as-built state or, at least, very nearly so. The type and scale of the maintenance activity will depend on the type of pavement failure being considered. Types of …

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Pavement failures [All the Essential things you should know]

Pavement failures Pavements begin to deteriorate when opened to traffic after construction as a result of the cumulative effect of traffic loading and environmental factors.  The figure below provides a pictorial representation of the state of a pavement defined by its present serviceability index (PSI) at any given time. The present serviceability index  (PSI) is …

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20 Defects in bituminous roads you should know

Defects in bituminous roads

Defects in bituminous roads are inevitable in bituminous roads. The following are the major defects associated with paved flexible pavements. The names in parenthesis against each defect are the various names by which the defect is also called or known. 1. Alligator crack (crocodile crack, alligator crazing, fatigue crack, map crack, chicken wire crack) Alligator …

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Bituminous Surfacing and Construction

Bituminous surfacing

Introduction Bituminous surfacing is any surfacing that involves the use of bituminous materials to waterproof the pavement surface and/or provide structural strength. Such a construction may consist of an application of a thin film of bituminous binder onto a base course or pavement surface followed by the spread of a single layer of chippings as …

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Aggregates for Road Construction

Aggregates for Road Construction

Introduction Natural rocks constitute the primary source of aggregates used in highway construction.  These rocks exist in the form of rock outcrops at or near the earth’s surface or gravel deposits usually along streams channels. In most cases, crushed rock aggregates from stone quarries may constitute the sole structural layer materials for high-performance roads. Other …

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Interlocking Concrete Block Pavements: Design, Construction and stability

Concrete Block pavements

Introduction Historically, interlocking concrete block paving technique originated from small-element surfacing which involved stone setts, wooden blocks, and bricks used for early city pavements in some parts of Europe in the nineteenth and twentieth centuries. Today, interlocking concrete block pavement is extensive and covers the following: Paving of container terminals at ports and harbors Paving …

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