Publications & Education/ OAPC Publications/ Fact Sheets and Informational Brochures
Fact Sheets and Informational Brochures
The Ontario Asphalt Pavement Council (OAPC - a council of the Ontario Road Builders’ Association (ORBA)) recognizes the impact the COVID-19 pandemic may be having on the industry, and in the lives of its workforce and families, and the general public. In regard to the production, delivery and placement of asphalt concrete, health and safety continue to be a first priority during these challenging times. Thus, we have devloped the COVID-19 Asphalt Industry Best Practices Guide. We ask that all members of the asphalt concrete/paving industry consider these safety reminders and recommendations compiled from industry submissions and resources to prevent or minimize the chance of contracting or transmitting COVID-19.
Roads are a major asset that play a significant role in the social and economical development of any community. Proper pavement design along with timely maintenance and rehabilitation are essential to ensure their durability and long-term service. This one-page check list provides information on the best approach when doing your homework first, to satisfy these requirements, guarantees good return on pavement infrastructure investment.
The durability of an asphalt pavement is seen through its ability to resist factors such as aging of the asphalt, disintegration of the aggregate and striping of the asphalt film from the aggregates. Asphalt pavements perform well when they are designed, produced and constructed to provide desired properties such as durability, impermeability, strength, stability, stiffness, flexibility, fatigue resistance, and workability.
The durability of asphalt concrete mixtures is affected by the properties of the aggregates and asphalt cement (AC) used in the mixture. The gradation and volumetric properties of the mixture; all of which are addressed during mixture design, also directly impact the durability of asphalt concrete pavement. Since the introduction of the Superpave mix design procedure, considerable research has been done to refine the design procedures, so that laboratory tests
and procedures used during the hot-mix asphalt (HMA) mix design process relate better to actual field performance.
Heating-up material components of hot-mix asphalt (HMA) is critical for production. However,
overheating the asphalt cement and mix will result in premature oxidation, which may lead to
cracking. Chemical reaction rates typically double with each 10°C increase in temperature. If HMA plant temperatures are too high, or if HMA mix is held at a high temperature for extended periods of time (e.g. long haul to jobsite or silos without nitrogen blanket), significant oxidation will lead to brittle binders.
Pavement surface preparation is an important part of any asphalt roadway rehabilitation or
new construction plan. In general, surface preparation could include one or more of a number of
operations such as cleaning, removal of loose material, physical and/or chemical treatment of a
surface, and application of a coating. These preparations are intended to ensure that the pavement
surface is adherable and that the full strength of the entire structure is utilized under traffic loads.
Proper bonding is critical in order for a pavement structure to behave as a cohesive durable unit and have adequate strength. This one-page check list provides information on best practices to ensure adequate pavement bond.
In pursuit of controling pavement density and ensuring that in-place voids are kept within acceptable specification limits, numerous considerations and/or processes are involved. This one-page check list provides information on the practices that will ensure that proper and consistent in-place density is achieved.
The goal of a mix design is to produce an asphalt mix with certian desirable characteristics such as workability, stability, durability, impermeability, flexibility and fatigue, rut and skid resistance. This one-page check list provides information on best practices on how to produce uniform and consistant quality mix.
The asphalt pavement recycling process uses Reclaimed Asphalt Pavement (RAP) materials
combined with new materials, sometimes along with a recycling agent (not common practice
in Ontario), to produce asphalt mixtures that are of equal or better quality to virgin aggregate
mixtures. This practice promotes sustainability and creates environmental benefits.
Premature pavement failures can be mitigated by completing proper Quality Assurance (QA) testing and inspection. QA specification is an important component of commitment to overall quality management. According to Transportation Research Circular, No. E C010 and E-C173, QA is an all-encompassing term, that includes these components: “Quality Control (QC)”, “Acceptance” and “Independent Assurance (IA)”. Proper QA including inspections conducted by qualified technicians and inspectors should be part of any HMA paving project to ensure long-term performance.
Once upon a time in Ontario, paving-grade asphalts were specified based on their properties in an original state following a specification such as the Performance Graded (PG) Asphalt Specification. However, there has always been an interest in determining the properties of in-place asphalt for research or forensic investigation purposes. This document provides insight into the results of the Ontario Industry Study, done in partnership between the OAPC and the University of Waterloo’s Center for Pavement and Transportation Technology (CPATT), to compare the physical properties of original asphalt sampled from tanks, to the properties of the same asphalt when it is recovered from a plant produced asphalt mix. The results include physical properties from test methods not included in past recovered asphalt studies: Multiple Stress Creep Recovery (MSCR), Extended Bending Beam Rheometer (ExBBR), and Double Notched Edge Tension (DENT) tests.
Nomeclature for Asphalt Cement Grades
Asphalt Cement Supplier Members of the Ontario Pavement Council (OAPC) met on February 2nd, 2018 to discuss standardizing the nomeclature of common Asphalt Cement (AC) grade currently being specified in Ontario.
OAPC Tire Scuffing and Indentations Position Paper
Owners of parking lots or driveways will often consider the appearance of scuffing and tire marking as a sign of poor quality resulting in a hot mix asphalt (HMA) that will not last as long as intended. This is not the case!
This one-page fact sheet gives the facts on what actually causes potholes, what can be done to prevent potholes and sheds light on common misconceptions.
Asphalt is the pavement of choice in North America and Ontario. Download this four-page fact sheet to learn why asphalt is the better way to pave.
This 46-page guide is intended to assist plant operators in operating and maintaining their facilities in a manner that minimizes potential environmental impact. It outlines a "best practices available" approach to environmental management but is not all-inclusive to cover all possible situations.
Prepared by the OGRA-OHMPA Asphalt Materials Liason Committee.
Did you know that asphalt is commonly used in municipal water works to line pipe? It is also used to line reservoir ponds, is water proof and does not leach toxins. Additionally, porous asphalt help with storm water management. Download this five-page document to learn more about how asphalt is used to keep our water clean.
How do you measure the greeness of pavement? Download this four-page document to learn how and why when we pave with asphalt, we are putting aggregate and asphalt cement resources in the bank for future generations.