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Jones, in 1981 there has been a great deal of change in the use of aggregates in roads. The drivers of this change are many and various, but the following, seem to me, of particular
importance:
• Environmental concerns, reflected by increasingly voluminous legislation, increasing
the pressure to incorporate unconventional materials into pavement construction.
• Reducing taxation regimes, with public spending moving away from infrastructure toneducation and health, thereby requiring more efficient use of money and resources.
• The completion of the principal road network in most developed countries and the consequent movement from construction to maintenance and improvement.
• An increasing recognition of the importance of road transport infrastructure in the economies of developing countries, yet where funding is very difficult.
In response to these issues, engineers have been driven back to a fundamental understanding of the way conventional crushed aggregates behave, how this compares to the behaviour of alternatives and how properties may be amended or best exploited to maximise their engineering capacity. In summary, one could say that the aim has been to get the necessary performance from different or poorer materials for less cost.
• Environmental concerns, reflected by increasingly voluminous legislation, increasing
the pressure to incorporate unconventional materials into pavement construction.
• Reducing taxation regimes, with public spending moving away from infrastructure toneducation and health, thereby requiring more efficient use of money and resources.
• The completion of the principal road network in most developed countries and the consequent movement from construction to maintenance and improvement.
• An increasing recognition of the importance of road transport infrastructure in the economies of developing countries, yet where funding is very difficult.
In response to these issues, engineers have been driven back to a fundamental understanding of the way conventional crushed aggregates behave, how this compares to the behaviour of alternatives and how properties may be amended or best exploited to maximise their engineering capacity. In summary, one could say that the aim has been to get the necessary performance from different or poorer materials for less cost.
Content:-
Introduction
Laboratory testing and granular material behaviour
Laboratory testing and granular material behaviour
1. Development of a simplified test for unbound aggregates and weak hydraulically bound materials utilising the NAT.
2. Assessment of the effect of seasonal variations on the unbound materials of low volume roads by laboratory testing.
3. Shear strength and permanent deformation of unbound aggregates used in Brazilian pavements
4. Modeling of material crushing in granular road bases
5. Fractal analysis of the abrasion and crushing of gravels
6. Comparative analysis of compaction procedures of unbound traditional and nonconventional materials
7. Cyclic plasticity based model for flexible pavements
8. Fundamental study on permanent deformation analysis of granular base course material using elasto-plastic model
9. Shakedown analysis of unbound road pavements—an experimental point of view
Pavement performance, evaluation and management
1. Damage law exponents for thin surfaced granular pavements
1. Damage law exponents for thin surfaced granular pavements
2. Behaviour of granular materials: field results versus numerical simulations
3. Test of the influence from mica and LWA on permanent deformations and calculation of the elastic and permanent response under HVS testing.
4. Influence of spring thaw on pavement rutting
5. Application of acceleration measurement method for estimating the stiffness of unbound aggregates in roadbed
6. Performance testing of unbound materials within the pavement foundation
7. Neural network-based structural models for rapid analysis of flexible pavements with unbound aggregate layers
8. Measurement of road performance and impact on transportation operations with the Opti-Grade system
9. Adaptation of a grading management system for unsealed road networks in New Zealand
Design of thin and unsealed pavements
1. Deformation behaviour of granular pavements
1. Deformation behaviour of granular pavements
2. A simplified method of prediction of permanent deformations of unbound pavement layers
3. Simplified model based on the shakedown theory for flexible pavements
4. Empirical shear strength models for unbound road-building materials
5. Design criteria of granular pavement layers
6. Design of low-volume roads in Lithuania
7. Mechanistic-empirical design models for pavement subgrades
8. A timber piled road over deep peat in North West Ireland
Recycled and secondary materials
1. The performance of an experimental road constructed from quarry waste
2. A laboratory study of the early life performance of a slag bound base
3. The use of recycled aggregates in slag bound mixtures
4. Load-deformation behavior of fly-ash and bottom-ash capping and fill layers based on FWD deflection measurements
Stabilisation
1. Laboratory and in situ evaluation of stabilisation of limestone aggregates using lime
1. Laboratory and in situ evaluation of stabilisation of limestone aggregates using lime
2. Rehabilitation of Unbound Pavements using foamed bitumen stabilisation
3. Strength and swelling properties of Oxford Clay stabilized with wastepaper sludgeash
4. Unsealed GeoCrete-road with high bearing capacity
Aggregate supply and specification
1. Aggregate supply and performance issues, Auckland, New Zealand
1. Aggregate supply and performance issues, Auckland, New Zealand
2. Unbound mixtures for pavement layers—BS EN 13285
3. Material and performance specifications for wearing-course aggregates used in forest roads
4. An end product specification for road foundations
Author index 453
Subject index
Subject index
Author Details
"Andrew R.Dawson"
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