Feedback aapt annual meeting technical sessions
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Feedback : AAPT - Annual meeting & technical sessions. 18 to 21 March 2001, Clearwater Beach, Florida,USA. Renaldo Lorio UWP Engineers. Location. The venue. Introduction. 344 delegates (44 foreigners, 2 from South Africa).

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Feedback aapt annual meeting technical sessions

Feedback : AAPT - Annual meeting & technical sessions

18 to 21 March 2001, Clearwater Beach, Florida,USA

Renaldo Lorio

UWP Engineers


Location

Location


The venue

The venue


Introduction

Introduction

  • 344 delegates (44 foreigners, 2 from South Africa).

  • 24 Papers - 60% by research / academia and 40 % from practice (majority of papers to a certain extent related to Superpave).


Attendance

Attendance

27%

25%

17%

15%

13%

2%


Structure of the meeting

Structure of the meeting

  • Annual business meeting

  • Government Engineers Forum (GEF)

  • Four technical sessions

  • One symposium

  • Annual banquet

All the sessions were in series (no parallel or breakaway sessions)


Government engineers forum

Government Engineers Forum

  • New format (participation of all delegates)

  • Two topics :

    • Density measurements and QC/QA

    • Joint construction (especially long. joints)


Joint types

Joint types


Technical session i

Technical session I

This session focused primarily on volumetric considerations (esp. VMA)

  • Current Superpave specifications too limiting (coarse graded mixtures with lower than required VMA often unnecessary penalized). (Anderson et al.)

  • VMA should not be a fixed value but should be determined for each type of aggregate. (Coree et al.)


Technical session ii

Technical session II

Various topics in this session

  • Internal structure of asphalt samples compacted with SGC – different from field samples, this affects performance testing. (Tashman et al.)

  • VDOT’s PG binder database – user and producer benefits. (Haddock et al.)

  • Pavement failures due to stripping - no surprise here. Keep the water out of the pavement. !! (Kandhal et al.)


Technical session iii

Technical session III

Session devoted to bituminous binders (Bahia et al.)

  • G*/sind for rutting and G*sind for fatigue are not appropriate performance parameters - propose Jv and Np (DSR measurements).


Technical session iv

Technical session IV

Various topics in this session

  • MMLS3 – development of criteria for rutting evaluation at WesTrack. (Epps et al.)

  • New fundamental material model to describe fatigue cracking (fracture mechanics). (Roque et al.)


Symposium

Symposium

  • Some contractors are not in favour of PRS but prefer performance guarantees

  • Case study – 7% premium (additional expenditure on installation of subs. drains,smoother paving, extra compaction effort, more personnel for process control).


Closing remarks

Closing remarks

  • Superpave design system still being refined, still a way to go.

  • Remember to do the basics correctly (Kandhal’s message).


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