HDR Confirmation Presentation: Roberto Espinosa

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HDR Confirmation Presentation: Roberto Espinosa

Title: The Improvement Of Marginal Materials For Foamed Bitumen Stabilisation


Foamed bitumen stabilisation is a unique pavement treatment option for treating new materials or rehabilitating pavements that have exceeded their serviceable life. It relies on the foaming of a stream of hot bitumen upon contact with water to bind the existing or imported granular material to produce a flexible material for use as base and subbase pavement.

However, unbound pavement materials that meet the specifications of Australian road agencies are getting more difficult to acquire in many regional areas in Australia. Hauling higher quality materials over long distances would significantly increase the cost associated with roadway construction and maintenance. Marginal and non-standard materials are usually available from local sources, which offer a logistically convenient and cost-effective solution.

Under many current specifications, a material can be considered non-standard for a variety of reasons - such as improper gradation or inadequate plasticity. Nevertheless, when a fit-for-purpose approach is applied to the selection, design, construction and maintenance of pavements incorporating non-standard materials, satisfactory long-term performance can be achieved.


Roberto has an overseas qualification in Civil Engineering recognised by Engineers Australia as meeting the current academic standing as a Professional Engineer (Skill Level 1) in Australia. Roberto is a NATA accredited (Level 5) and can perform most quality tests required for concrete, asphalt, aggregates, and soils tests for engineering purposes.

Roberto is currently working full time at Fulton Hogan as the Technical Foreman of our Stapylton Technical Laboratory. He engages, trains and develops laboratory technicians and assists in preparing mix designs in accordance with TMR, AAPA, and AAA specifications.

Roberto is married with one daughter and loves reading and catching up with friends.

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