The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.
From page 22... ...
11 CHAPTER TWO EVALUATION, VALIDATION, AND IMPROVEMENT OF STRUCTURAL DESIGNS INTRODUCTION This chapter discusses APT research to enhance the structural design of pavements. In structural design, the stiffness and thickness of the pavement layers are selected to ensure an adequate support structure such that the bearing capacity of the underlying subgrade is not exceeded.
|
From page 23... ...
12 • Very few respondents reported studies on environmental aspects; two had studied noise and one dust pollution (Figure C26)
|
From page 24... ...
13 (0.5% above optimum) mix in the lower base that did not show excessive deformation in that material.
|
From page 25... ...
14 However, when an 80-kN standard axle was introduced using a rigid truck, movement at the slab center was six times greater than that produced by ALF. This reflects the importance of slab curl, and the effects of pavement shading and loading configuration.
|
From page 26... ...
15 APPLICATIONS OF ACCELERATED PAVEMENT TESTING TO COMPOSITE STRUCTURES HVS testing has been instrumental in validating the effectiveness of inverted pavement structures, which are now used extensively throughout South Africa. These structures incorporate stabilized or lightly cemented (<4%)
|
From page 27... ...
16 cated that the blast furnace slag could be used in the place of high-quality, crushed-rock road bases. The slag and stabilized slag materials proved suitable for use as base material provided they are protected from excessive tensile stresses.
|
From page 28... ...
17 encing the performance of these base types are nonuniform cement distribution, inadequate mixing of the cement and soil, and the high probability of shrinkage cracking. This leads to nonuniform support of the pavement, which results in isolated pavement failures and marked variability of the pavement performance.
|
From page 29... ...
18 reference or benchmarks to compare the relative performance of the experimental materials. The bituminous materials were compacted to a thickness of 100 mm on top of a 300-mm, untreated, well-graded crushed-aggregate subbase, purposely designed to allow deformation in the base.
|
Key Terms
This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More
information on Chapter Skim is available.