News | Hesp Research Group
March 1, 2016 | AASHTO SOM votes to adopt EBBR!
The American Association of State Highway and Transportation Officials Subcommittee on Materials (AASHTO SOM) voted to adopt the Extended Bending Beam Rheometer (eBBR) test protocol, as Provisional Standard TP 122-16, to be published later this year. The eBBR test has been implemented for the acceptance of asphalt cement on paving contracts around Ontario since 2009. The eBBR measures the grade and grade loss after 72 hours of isothermal conditioning at 10 and 20 degrees Celsius above the lower design temperature of the pavement. Grade losses are highly sensitive to the presence of deleterious additives (waxes, REOB, air blown residues, pitches, acids, bases, etc.). Further, by testing binder recovered from paving mix, the protocol also provides a secure way to account for the presence of recycled pavement (RAP) or shingles (RAS) in the design process. The eBBR was developed over the last 10 years in collaboration with staff from the Ministry of Transportation of Ontario (MTO) in response to numerous costly premature cracking incidents on provincial roads (e.g., see Hesp et al., International Journal of Pavement Engineering, Vol. 10(3), 209-227, June 2009). Our next big effort will be to get more user agencies familiar with the method. The long term objective is to see both the double-edge-notched tension test (DENT, TP 113-15) and eBBR implemented around the continent and beyond.
November 18, 2015 | Elaine Thompson Award
Professor Hesp and his students Jamie-Lee Freeston, Graeme Gillespie, Migle Paliukaite and Russell Taylor won the Elaine Thompson Award for their paper Physical Hardening in Asphalt presented at the 2015 Canadian Technical Asphalt Association''s Annual Meeting in Ottawa. The oral presentation was given by Jamie-Lee Freeston. The results provide a validation of Ontario test method LS-308 and shows how the associated acceptance criteria can very effectively limit insidious gelation of asphalt cements when conditioned at cold temperatures. LS-308 has been in use on Kingston contracts since 2009 and has more recently been adpoted by a number of other municipalities(Durham, Niagara, Peel, Timmins, Toronto, Waterloo, and York). The Honourable Steven Del Duca, Ontario''s Minister of Transportation, announced on November 19 that starting in 2016, LS-308 will be phased in on all future provincial contracts. LS-308 is expected to provide major life cycle benefits for a more sustainable pavement infrastructure.
July 1st, 2015 | Hesp Research Group in the News
This pothole season has finally ended! Once again Professor Hesp was in high demand for interviews in the Timmins Press, Northern Ontario Business News, CBC Thunderbay, Toronto Sun, Norther Life, Radio Canada, and The Guardian Newspapers.
June 10-12th, 2015 | Dr. Paliukaite Speaks in Greece
Postdoctoral Fellow Migle Paliukaite spoke at the 6th International Conference on Bituminous Mixtures and Pavements in Thessaloniki, Greece. Her presentations addressed the further development of the double-edge-notched tension test and the application of the MEPDG software for the control of thermal cracking in Ontario pavements.
June 9th, 2015 | With Sadness and Joy
It was with sadness and joy that Prof. Hesp said goodbye to serveral students: Bidur Ghimire, John Ikpugha, Isaac Omari and David Sowah-Kuma all received their well-deserved M.Sc. degrees during convocation ceremony in Grant Hall. Their happy smiles will be sorely missed in Chernoff Hall but the very best wishes to them in their future endeavors!
April 11-19, 2015 | Prof. Hesp visits Gdansk, Poland, and Tallinn, Estonia
Professor Hesp visited the Technical University of Gdansk in Poland, Tallinn University of Technology in Estonia and the Estonian Road Administration. Both Poland and Estonia as seeing major infrastructure investments and changes in their asphalt industries. This visit was arranged to exchange information on how best to specify asphalt cement in order to obtain value for money.
January 6, 2015 | AASHTO SOM votes to adopt DENT!
The American Association of State Highway and Transportation Officials Subcommittee on Materials (AASHTO SOM) voted to adopt the Double-Edge-Notched Tension test (DENT), as a Provisional Standard to be published later in 2015. The DENT test has been implemented for the acceptance of asphalt cement on paving contracts around Ontario since 2012. The extended bending beam rheometer test (eBBR) is currently being drafted in AASHTO format and will be balloted later this summer. The next big effort will be to get more user agencies familiar with both methods. Our long term objective is to see both DENT and eBBR implemented around the continent and beyond.
October 14, 2014 | New England States Act on REOB in Asphalt Supply
The CommnonWealth Magazine published an article on how the New England States of Massachusetts, Maine, New Hampshire and Vermont are dealing with the presence of recycled engine oil bottoms (REOB) in the asphalt cement supply.
Read more on this store here.
August 1, 2014 | Making a DENT in Pavement Cracking for South America
The Double-Edge-Notched Tension (DENT) test was featured in an article Trabajo Esencial de Fractura de Ligantes a Temperaturas Intermedias por Ductilómetro no Convencional in REVISTA CONSTRUYENDO CAMINOS, Ed. 13 - August 2014, a magazine published from Lima, Peru, dedicated to asphalt pavement engineering in South America. The DENT test has been validated with data from the latest U.S. Federal Highway Administration Accelerated Loading Facility (ALF) experiment as well as with numerous pavement contracts from around the Province of Ontario in Canada. A critical crack tip opening displacement (CTOD) acceptance criterion promotes modifiers and additives that improve a binder’s strain tolerance in the ductile state under severe confinement, as within the aggregate mixture. Most importantly, it provides a strong incentive for the use of superior quality base asphalt cements. By using a mechanics-based test property such as CTOD for asphalt specification it is likely that fatigue and other types of cracking will become a distress of the past.
January 23, 2014 | Intelligent Roads
Want to build better roads that are less harmful to our environment and economy due to reconstruction costs and traffic delays? Make them last longer by selecting the right materials! Simon Hesp, a.k.a. Professor Pothole, spoke to the Toronto Star about why Ontario roads are showing so much distress these days. His research collaborations with MTO and the City of Kingston are paying off to build roads with a significantly reduced life-cycle cost. The article was followed by three television interviews (CBC Ottawa, CKWS and Global News Toronto) and as many as 10 radio interviews (CBC Ottawa, Montreal, Toronto, St. Catharines, Hamilton, and Calgary). Most of the video and sound clips are available online. Naysayers can visit Google Street View at the Monkland intersection on Highway 138 in eastern Ontario: Go north for 20 km to Highway 417 and see what poor quality materials tainted with waste engine oil residue do to performance. Go south for 20 km to Cornwall to see a superior performing pavement of nearly equal age, design, climate and sub-grade, but which carries nearly twice the traffic. Last year the City of Kingston placed approximately 50,000 tonnes of asphalt with similar superior quality and durability while the Ministry of Transportation of Ontario has implemented one of the three test methods on all contracts that require modified asphalt cement since 2012.
January 15, 2014 | Hesp Research Group presents at 2014 Annual Meeting of TRB in Washington D.C.
Kelli-anne Johnson and Michaela Thomas presented their research results at the 2014 Annual Meeting of the Transportation Research Board in Washington D.C. A paper on the Effect of Waste Engine Oil Residue on Quality and Durability of SHRP MRL Binders passed the rigorous peer review process and was accepted for publication in the Journal of the Transportation Research Board published by the US National Academies. Since 1994, Hesp Research Group members have presented and published a total of 18 original research papers through TRB's committee AFK20 on Bituminous Materials, which this year only selected 15% of submissions for publication in the journal!
December 2-10, 2013 | Hesp Research Group Presents in Brazil
Professor Hesp, M.Sc. student Samuel Abiodun and Professor Emeritus Gus Shurvell traveled to Brazil, to present their work at the Petrobras Laboratories in Rio and at the First Conference of the International Journal of Pavements in Sao Paulo. Samuel presented his thesis research on Cold-in-Place Recycling with Expanded Asphalt Mixture (CIREAM) while Gus presented our findings on the detection of used motor oil residue in asphalt cement.
June 21, 2013 | Colleen Kinross and Ryan Bricker Present at ASCE Meeting in Los Angeles
Colleen Kinross and Ryan Bricker presented their summer 2012 research results at the 2013 Airports and Highways Pavements Conference organized by the Transportation and Development Institute (T&DI) of the American Society of Civil Engineers (ASCE) in Los Angeles, California. Colleen’s paper, Microindentation Specification Grading of Thin Film Aged Asphalt Cements from a Northeastern Ontario Pavement Trial, won second prize in the best young member paper competition! Her results provide insights on how chemical aging of asphalt cements in thinner films and in the presence of moisture can greatly enhance specification grading accuracy. Ryan’s paper, Modulated Differential Scanning Calorimetry Study of Physical Hardening Rates in Asphalt Cements, sheds further light on detrimental, gradual hardening processes. The photograph shows Colleen receiving her award from the conference organizers.
May 1, 2013 | Six SWEP Students Start Summer Projects
The Queen’s Summer Work Experience Program (SWEP) has been kind to the Hesp Research Group this year and provided partial funding for as many as six new summer positions! From left to right in the photograph are Michaela Thomas, Jordan Marr, Morgan Roff, Owen Larsen, Michaela McGurn and Kelli-anne Johnson. They will be working on projects related to warm asphalt rubber and physical hardening at cold temperatures.
March 5, 2013 | Chen of CBC’s Ontario Morning Interviews Professor Hesp
The pothole season has been with us again and for that reason Professor Hesp was interviewed by Wei Chen of CBC’s Ontario Morning. The interview was broadcast from Windsor to Cornwall and touched on a number of issues related to asphalt quality and why we are seeing so many potholes in Ontario roads. Professor Hesp provided an update on research progress and discussed the ubiquitous presence of waste engine oil residue in the Ontario asphalt market.
January 15, 2013 | Seyed Tabib and Hattie Xu Present at 2013 Annual Meeting of TRB in Washington D.C.
Senior Bituminous Engineer Seyed Tabib of the Materials and Engineering Research Office of the Ontario Ministry of Transportation and Undergraduate Student Hattie Xu of the Hesp Research Group presented a paper on Quality and Durability of Warm Rubberized Asphalt Cement in Ontario at the 2013 Annual Meeting of the Transportation Research Board in Washington D.C. The results provide useful insights on how to formulate superior asphalt rubber binders for use in northern climates.
November 1, 2012 | Hesp Group Receives Major Support for Warm Rubberized Asphalt Research
Major funding has been secured in the form of research grants and contracts for the investigation of warm asphalt cement and warm rubberized asphalt cement. The research project will investigate the way in which warm mix additives and crumb rubber modifier interact to produce superior performing asphalt rubber pavements. The total commitment of $420,000 plus $80,000 in-kind over the next three years will fund the salaries of numerous undergraduate and graduate students as well as pay for a new gyratory compactor and moisture conditioning system.
Special thanks go out to the following funding sources: Akzo Nobel Surface Chemistry, Imperial Oil, Natural Sciences and Engineering Research Council of Canada, Ontario Ministry of Transportation, and Ontario Tire Stewardship.
October 18, 2012 | Undergraduate student Ryan Bricker, Professor Hesp, and MTO Senior Bituminous Engineer Pamela Marks Present in Warsaw, Poland
At the invitation of the Polish Asphalt Paving Association (www.PSWNA.pl), undergraduate student Ryan Bricker, Professor Simon Hesp, and MTO’s Senior Bituminous Engineer Pamela Marks presented several talks on Ontario’s experience with the development of improved asphalt cement specification tests. The Polish government has been experiencing premature cracking in some 1,000 km of high stiffness base and binder course pavements it has constructed over the past 10 years. It appears that the air blown asphalt cement that is regularly used for such designs in France does not deliver for the Polish climate where temperatures can reach to lows more like those regularly seen in Ontario.
September 1, 2012 | Professors Simon Hesp and Gus Shurvell win MAIREPAV7 Best Paper Award
Professors Simon Hesp and Gus Shurvell are the recipients of a Best Paper Award in the theme of Pavement Materials and Technology for their contribution “Waste Engine Oil Residues in Asphalt Cement” out of 32 submissions. The 7th International Conference on Maintenance and Rehabilitation of Pavements and Technological Control (MAIREPAV7) was held August 28-30, 2012, in Auckland, New Zealand.
August 10, 2012 | Hesp Research Group Invited to Present Research Results in Mexico City
Undergraduate student Andrew McIntyre, graduate student Senthil Kumar, and Professor Simon Hesp were invited to give three presentations on their latest research findings at the workshop Polimeros RET en los Caminos de Mexico y el Mundo, as organized by La Associacion Mexicana de Ingenieria de Vias Terrestres (Mexican Association of Road Engineers). The workshop was held on August 8, 2012, in Mexico City and was attended by both industry and government representatives. The photograph shows Professor Hesp and undergraduate student Andrew McIntyre inspecting the historical pyramids of Teotihuacan.
May 1, 2012 | Kingston Uses Quality Asphalt Cement for the Reconstruction of John Counter
The City of Kingston has continued with the implementation of Ontario Standard Test Methods LS-299 and LS-308 as developed at Queen’s for the specification and acceptance of superior quality asphalt cement in the 2012 reconstruction of a large stretch of John Counter Boulevard between Division Street and Sir John A. Macdonald Boulevard. The material as tested in the lab defies aging and is expected to provide a crack free driving surface for many years to come!
January 1, 2012 | Ontario Ministry of Transportation Implements LS-299 and LS-308 on Numerous 2012 Provincial Paving Contracts
The Ontario Ministry of Transportation (MTO) has reached agreement with industry to implement LS-299 Asphalt Cement’s Resistance to Fatigue Fracture Using Double-Edge-Notched Tension Test (DENT), for acceptance purposes on nearly all provincial paving contracts that use modified asphalt cement. LS-308 Determination of Performance Grade of Physically Aged Asphalt Cement Using Extended Bending Beam Rheometer Method will remain as a reporting requirement on all 2012 MTO contracts.
November 10, 2011 | Kingston Uses Quality Asphalt Cement for the Reconstruction of Division Street
The City of Kingston has continued with the implementation of Ontario Standard Test Methods LS-299 and LS-308 as developed at Queen’s for the specification and acceptance of superior quality asphalt cement in the November 2011 reconstruction of a large stretch of pavement on Division Street.
November 18, 2011 | Hesp Research Group Presents at the Canadian Technical Asphalt Association Meeting in Quebec City
Undergraduat student Syed Rubab accompanied Professor Hesp to Quebec City, to present results on the comparison of reactive elastomeric terpolymer, styrene butadiene, and polyphosphoric acid type modifiers for asphalt cement. The Canadian Technical Asphalt Association Annual Meeting was held from November 12-16, 2011, in the Fairmont Le Chateau Frontenac Hotel in Quebec City. The photograph shows Syed Rubab presenting his work in front of nearly 200 conference attendees.
November 1, 2011 | Hesp Research Group Presents in Lima, Peru
Undergraduate students Jennifer Erskine and George Warburton accompanied Professor Hesp to Lima, Peru, to present results on the investigation of various straight and modified asphalt cements. The XIII Congreso Nacional del Asfalto was held in Lima, Peru, October 13-14, 2011. The photograph shows Professor Hesp and undergraduate students Jennifer Erskine and George Warburton inspecting the historical city of Machu Picchu.
June 1, 2008 | NSERC Features Hesp Research Group in Impact Story
The City of Kingston has continued with the implementation of Ontario Standard Test Methods LS-299 and LS-308 as developed at Queen's for the specification and acceptance of superior quality asphalt cement in the November 2011 reconstruction of a large stretch of pavement on Division Street.
June 1, 2008 | ACCN Covers Hesp Research in Feature Article
The May 2008 issue of ACCN L’Actualité Chimique Canadienne/Canadian Chemical News covered the recent accomplishments of the Hesp Research Group in a full page feature article titled Ribbon Roads.