A co-operative research group was formed in 1975 by the Asphalt and Coated Macadam Association, the British Tar Industry Association, the Refined Bitumen Association and the Transport and Road Research Laboratory (TRRL) to carry out research to improve the performance of bituminous roadbase and basecourse macadams when used in highways construction. Over the years the members have changed, and some organisations have changed their names, but the programme essentially continues to this day under the sponsorship of Highways England, in association with the Mineral Products Association and Eurobitume.
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This page is a collation of reports and technical notes produced under this programme of work. The reports are presented in their series, with the most recent publications at the top of each series.
TRL Published Project Reports
PPR960 Review and update of the asPECT carbon footprinting tool
PPR742 Use of lower temperature asphalt in pavement construction
PPR708 Review of joint repair techniques for thin surface course systems
PPR670 Optimising the returns from modern asphalt surfacings (2)
PPR649 Optimising the returns from modern asphalt surfacings (1)
PPR564 The skid resistance behaviour of thin surface course systems
PPR324 Surface requirements for asphalt roads
PPR087 Accelerated and field curing of bituminous roadbase
PR065 Evaluation of stone mastic asphalt (SMA): A high stability wearing course material
TRL639 Guidance on the development, assessment and maintenance of long-life flexible pavements
TRL638 A model set of asphalt sustainability indicators
TRL636 The application of Enrobe a Module Eleve in flexible pavements
TRL250 Design of long-life flexible pavements for heavy traffic
TRRL Lab Reports
LR1060 A dense coated roadbase macadam of improved performance
LR891 Trials of a modified specification for compacting dense roadbase and basecourse coated macadam
LR727 Rolling requirements to improve compaction of dense roadbase
LR691 Bituminous drum mixing plants in the USA
LR533 The Wibau dustless asphalt plant: the performance of european installations
LR496 Some effects of loading history on the fatigue performance of rolled asphalt
LR471 Effects of secondary compaction on the fatigue performance of a hot-rolled asphalt
TRRL Supplementary Reports & Leaflets
SR717 Standards for compaction of dense roadbase macadam
SR626 Deformation resistance of dense coated macadams: effect of compaction and binder content
SR493 Final report of the working party on the slippage of rolled-asphalt wearing course
SR410 Fatigue resistance of dense bitumen macadam: the effect of mixture variables and temperature
SR242 French experience with grave-bitume a dense bituminous road base
SR213 Interim report of the working party on the slippage of rolled asphalt wearing courses
LF432 Improving the performance of bituminous base and basecourse macadams in relation to their cost
Road Note 39 (7th edition) Design Guide for Road Surface Dressing
Road Note 41 Best Practice Guide for Overlaying Concrete
Road Note 42 Best Practice Guide for Durability of Asphalt Pavements
If you are aware of other reports that are not listed here, please do contact TRL and we will be pleased to add them to this list.
We have other reports in the library which are available on request only.
