Paul Lum This is Me

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1. 1. Fibre Modified Asphalt shows promising results

   www.rocktoroad.com/fibre.html - [Cached]

   Published on: 5/4/2006   Last Visited: 12/15/2007

   "When using polymers in asphalt the viscosity, or thickness, of the liquid increases", explains Paul Lum, Ashwarren Engineering Services manager, "and this increase in viscosity is compounded when cellulose fibre is added.
   ...
   Lum also points out that the FMA mixes have the potential to increase the stiffness in the mixture, film thickness and overall asphalt content compared to conventional HMA mixtures, all excellent features leading to increased durability.

2. 2. Aggregates & Roadbuilding Magazine - March/April 2004 Issue

   www.rocktoroad.com/04maissue.h - [Cached]

   Published on: 5/4/2006   Last Visited: 12/15/2007

   Paul Lum, director of new product commercialisation and quality assurance at Lafarge Canada Inc., explained in his paper "What mix designers have learned" that recent work included an evaluation of current asphalt aggregates to assess their fit with Superpave requirements. It was found, among other things, that the percentage of crushed faces required was dependent on mix design based on the number of gyrations and location of a mix in the pavement elevation. On the issue of using local aggregate deposits for Superpave mixes, Lum explained that local sources have been successfully used in the 50 and 75 (N design) gyration Superpave mixes that are generally required for lower traffic volumes. In locations subject to heavier loading however, 100 and 125 gyration Superpave mixes typically require washed screenings or manufactured (crushed) sand to retain the necessary air voids in the mixture. Lum added that this requirement does not represent a major change, as these high gyration Superpave mixes are used in applications similar to the MTO's existing Heavy Duty Binder Course (HDBC) and Dense Friction Course (DFC) mixes which require 100 per cent manufactured fine aggregates. According to Lum, there has been no difficulty in introducing RAP into Superpave mixes. Superpave mixes have been classified according to the nominal maximum size (NMS) of the aggregate, where NMS is one size larger than the first sieve to retain more than 10 per cent of the sample. The asphalt cement (AC) content of Superpave mixes may be determined from the Asphalt Institute manual SP2 which sets out AC content for a particular mix classification. Turning to equipment and testing, Lum stressed the importance of gyratory compactor maintenance and calibration, noting that sampling and sample handling, equipment calibration, equipment maintenance, internal angle and mould wear can all cause variability in test results between different gyratory compactors. A Dynamic Angle Validator (DAV) can be utilised to calibrate the internal angle of gyratory compactors and proper angle calibration will minimise variances in test results caused by differences in internal mould angles between different compactors. See sidebar, "The gyratory compactor angle issue". Lum concluded by describing a situation in which all calibrations and procedures, including internal angle, had been confirmed for a gyratory compactor, but where a study still obtained 1.5 per cent higher air voids.

3. 3. Superpave meets SMA, attracts international interest

   www.rocktoroad.com/d02Superpav - [Cached]

   Published on: 12/1/2002   Last Visited: 12/15/2007

   Lafarge's Paul Lum explains: "The package was designed specifically for this application, and our overall objective is to combine the rut resistance of the Superpave binder mix with an SMA surface mix that delivers rut resistance and durability as well as the economy of limestone aggregates."
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   According to Lum, the overall cost of the package is competitive, with the two lifts of hot mix, supplied and installed, in the range of $20-$25 per square metre. Warren Bitulithic Ltd. is part of Lafarge Canada Inc. Paul Lum is director of New Product Commercialization and Quality Assurance, Eastern Canada Region, Lafarge Canada Inc.