What are the principles of pavement design?
CONTENTS: FUNDAMENTAL PRINCIPLES PAVEMENT TYPES AND WHEEL LOADS STRESSES IN FLEXIBLE PAVEMENTS STRESSES IN RIGID PAVEMENTS PAVEMENT BEHAVIOR UNDER MOVING LOADS CLIMATE RIGID-PAVEMENT PUMPING PROPERTIES OF PAVEMENT COMPONENTS; DESIGN TESTS SOILS EVALUATING SOIL STRENGTH AND OTHER PROPERTIES OF SOILS, BASE COURSE, AND …
How do you design a road pavement?
Pavement Design in Road Construction – Design Parameters
- As per the IRC:37 design traffic should be 0.1 msa to 2 msa (million standard axles). Weight of commercial vehicle (laden) is considered as 3 tonnes or more.
- Computation of design traffic:
- Sub-base course:
What are the structural requirements to design pavements?
Requirements of a pavement
- Sufficient thickness to distribute the wheel load stresses to a safe value on the sub-grade soil,
- Structurally strong to withstand all types of stresses imposed upon it,
- Adequate coefficient of friction to prevent skidding of vehicles,
What are the design parameters for the pavement design?
When designing pavements (both mix design and structural design), there are three fundamental external design parameters to consider: the characteristics of the subgrade upon which the pavement is placed, the applied loads and the environment.
How is IRI calculated?
IRI is calculated from a measured longitudinal road profile by accumulating the output from a quarter-car model and dividing by the profile length to yield a summary roughness index with units of slope.
What is standard axle load?
A standard truck has two axles, front axle with two wheels and rear axle with four wheels. For highways the maximum legal axle load in India, specified by IRC, is 10 tonnes. Standard axle load: It is a single axle load with dual wheel carrying 80 KN load and the design of pavement is based on the standard axle load.
What are the objectives of pavement design?
The objective in the design of the road pavement is to select appropriate pavement and surfacing materials, types, layer thicknesses and configurations to ensure that the pavement performs adequately and requires minimal maintenance under the anticipated traffic loading for the design life adopted.
What is the minimum CBR value for subgrade?
According to the subgrade characterization which recommends 10% as minimum CBR value for the layer , the subgrade material proved adequate as this value appears to have been exceeded by a wide margin at most of the sections along the road. …
What is the main aim of the pavement design process?
What is the main aim of the pavement design process? Explanation: The pavement design mainly aims at determining the total thickness of the pavement. The thickness of each layer of the pavement is found out by designing it with proper inputs and then the total thickness is found out.
What is the most important while designing a pavement?
Traffic is the most important factor in the pavement design. The key factors include contact pressure, wheel load, axle configuration, moving loads, load, and load repetitions.
What is parameters in design?
1. Aspects of a component that are needed to make something. It decides cost, design, materials, and risk.
What is the design life of flexible pavement?
It is recommended that a design period of 20 years may be adopted for the structural design of pavements for National Highways, State Highways and Urban Roads. For other categories of roads, a design period of 15 years is recommended.
What are the main principles of pavement design?
Pavement Design Two theoretical pavement types Rigid Pavement – Resists traffic loading by resistance to bending. Concrete pavement is primarily rigid. Pavement Design Two theoretical pavement types Flexible Pavement – Resists traffic loading through “internal friction”.
Which is the best type of pavement to use?
Pavement Design Two theoretical pavement types Flexible Pavement – Resists traffic loading through “internal friction”. An unpaved road with a compacted crushed stone course is a pure flexible pavement. Old-fashioned asphalt pavement (thin asphalt layer over a granular base) is mostly a flexible pavement. Pavement Design
Which is more flexible asphalt or unpaved road?
An unpaved road with a compacted crushed stone course is a pure flexible pavement. Old-fashioned asphalt pavement (thin asphalt layer over a granular base) is mostly a flexible pavement. Pavement Design Modern asphalt pavements are difficult to analyze mathematically. Two key factors: Vertical compressive strain in subgrade
How long does it take to design unbound pavements?
Although predominately concentrating on unbound pavements, considerable time is allocated to designing bound pavements for light traffic as per Austroads Guide Chapter 12 – Design of Lightly-Trafficked Pavements. Payment is required 14 days from date of invoice.