Essays on Subgrade

Abstract

A dual carriageway is proposed to be constructed in the town moving in the east-west direction. The dual carriage is intended to be eight-kilometer long looping around the northern part of the town. Cut and fill techniques are used where half of the road is cut to a maximum of six meters. Half of the road is supported by an embankment of six meters high. At the eastern and western ends of the road are of grade where the road joins other roads and at the middle where the cut sections meet the filled sections. The road has a ...

Airport Pavement Management Program (PMP) and Airport Signage and Marking Program

Goals: Ensure provision of smooth surfaces with excellent skid resistance devoid of alligator cracks, frost heaving, pumps, ravels, pot holes and wheel rutting which may hinder effectual motion in the airport.

Ensure effectual repair and maintenance of Airport pavements

Ensure proper and clear signage and markings in airports Assumptions and other considerations: It is advisable to submit written suggestions of Airport pavement repairs to the regional Maintenance Engineer who then shares with the Airport Pavement Management Program coordinator in order to ensure good coordination between maintenance and construction initiatives at the airports. Detecting, recognizing and clearly marking runway holding positions and signs in an airport is effectual ...

- Introduction The subject of this study concerns some of the most serious pavement deficiencies: alligator cracking, bleeding, and potholes. Alligator cracking and potholes can often shorten the pavement’s lifespan. Bleeding more often impacts road safety; bleeding causes reduced friction which, in turn, can cause skidding for drivers. The case study focuses on alligator cracking, potholes, and bleeding in an effort to explain their impact on pavement, as well as how they are remedied. In an effort to better understand the detriment these issues cause, a local two-lane road was studied for evidence of distress and damage. ...

Abstract

Flexible pavement distresses are caused by poor design, wear and tear, and traffic loading beyond design capacity. The amount of loading that a pavement can bear without failure is determined by the strength of the subgrade and the surface layer. Pavement failures are of eight major types; potholes, bleeding, alligator cracking, rutting, shoving, depression, block cracking, and longitudinal cracking. Each pavement distress has causal gents and repair methods defined by local and international codes. This report shall focus on bleeding, potholes, and alligator failure.

Introduction

Potholes, bleeding, and alligator cracking which are the subject of this case study are some of ...

Pavement distresses are distortions in the pavement surface and the subgrade either due to poor design or external factors. Distresses shorten the lifespan of a pavement and pose a danger to the road users or causes discomfort. This is a paper on the different types of road distresses, causes, and the mitigation measures which can be taken to remedy the distresses.

Rutting

Rutting is the accumulation of slow permanent deformation due to continuous densification of pavement layers caused by the shear displacement of the subgrade. Shearing causes uplifting on the sides of the rut. Rutting occurs along the tracks of heavy vehicles on a ...