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The Pankian Metaphor 3073


a little more search engine use:

this references

has the following:

Before any pavement construction can be specified, it is necessary to quantify the value of 2 variables....

* The CBR (California Bearing Ratio) of the sub-grade

* The expected traffic volumes and types over the design life of the pavement (usually 20 years)

... snip ...

has the following:

Highways built to last 25 years take such a pounding from the level and the weight of traffic that they rarely last that long. Almost a third of all bridges in the country are either structurally deficient or functionally obsolete. Yet, many highway engineers agree that 50-year pavements and 100-year bridges should be attainable using current technology.

... snip ...

has the following:

QUOTE: IT IS RECOMMENDED THE NEW PAVEMENT FOR 30 TO 50 YEAR RANGE DESIGN LIFE TO ACCOMODATE THE 75 YEAR LIFE OF THE BRIDGE STRUCTURE. THE DESIGNER SHOULD CHOOSE THE DESIGN WHICH PROVIDES THE MAXIMUM DESIGN LIFE WITHIN THE BUDGET CONSTRAINTS.

... snip ...

also from above:

For pavement design, in the UK the design life could be as little as 10 years, with increasing requiements for stiffness to prolong life. As stiffness goes up, so should the 'potential' life of the pavmement.

... snip ...

for some drift, World Bank has reference here that summarizes some of the software tools they have for designing roads

The Pankian Metaphor 3075
and my point is that "prices" should be proportional to costs. if you have "prices" significantly different than costs you can be encouraging extremely bad-poor economic behavior. If it...

....

has the following

In the design of any street or highway the designer must select a design life for the facility. In the case of most highways the geometric design life is 30-60 years and the pavement design life is 20-30 years, taken from the date of construction. The length of the design life is affected by policies established before and during the project's life for the environment in which it is placed. Residential and commercial development, geography, expected traffic, and soil conditions may affect the performance of the pavement and the operation of the facility. The objective of this laboratory exercise is to estimate the traffic volumes and percentage of cars and trucks that will use the facility over the course of the next thirty years. This estimate will be used in the design of the pavement thickness, completion of the environmental impact statement, and will affect the horizontal and vertical alignments.

... snip ...

and of course from prevous post

misc road construction ref:

603.1 Introduction

The primary goal of the design of the pavement structural section is to provide a structurally stable and durable pavement and base system which, with a minimum of maintenance, will carry the projected traffic loading for the designated design period. This topic discusses the factors to be considered and procedures to be followed in developing a projection of truck traffic for design of the "pavement structure" or the structural section for specific projects.

Pavement structural sections are designed to carry the projected truck traffic considering the expanded truck traffic volume, mix, and the axle loads converted to 80 kN equivalent single axle loads (ESAL's) expected to occur during the design period. The effects on pavement life of pbuttenger cars, pickups, and two-axle trucks are considered to be negligible.

Traffic information that is required for structural section design includes axle loads, axle configurations, and number of applications. The results of the AASHO Road Test (performed in the early 1960's in Illinois) have shown that the damaging effect of the pbuttage of an axle load can be represented by a number of 80 kN ESAL's. For example, one application of a 53 kN single axle load was found to cause damage equal to an application of approximately 0.23 of an 80 kN single axle load, and four applications of a 53 kN single axle were found to cause the same damage (or Debt Reduction in serviceability) as one application of an 80 kN single axle.

... snip ...

The Pankian Metaphor 3074
I have seen highways that have been substantional rebuilt after a service lifetime on the order of 50 yrs. misc road construction ref: 603.1 Introduction The primary goal...

from the previous posting extract on the "design of pavement structural section" the paragraph:

Pavement structural sections are designed to carry the projected truck traffic considering the expanded truck traffic volume, mix, and the axle loads converted to 80 kN equivalent single axle loads (ESAL's) expected to occur during the design period. The effects on pavement life of pbuttenger cars, pickups, and two-axle trucks are considered to be negligible.

... snip ...

The Pankian Metaphor 3077
ref: and the reference mentioned in that posting the new technology i was noticing at the new weigh stations appears to be somewhat similar to the overhead ez-pbutt transponder sensors on toll roads, called...

the last paragraph in the referenced paragraph comments that

The effects on pavement life of pbuttenger cars, pickups, and two-axle trucks are considered to be negligible.

... snip ...

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