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What Is The Rolling Thin Film Oven Test Method?

All You Need to Know About RTFO

A Sure-Fire Way to Predict Pavement Quality

What’s one of the best ways to predict pavement quality? The Rolling Thin Film Oven (RTFO) is a good place to start! The properties of the binder in Hot Mix Asphalt (HMA) change and undergo significant aging during handling, mixing, and paving operations, so it’s important to ensure that the end product still meets the design requirements when placed. A properly designed and installed asphalt pavement will withstand traffic and weather conditions for many years to come. In this blog post, we’ll cover the importance of measuring these asphalt binder characteristics and the best equipment to use.

Rolling Thin Film Oven Test Method

Rolling Thin Film Oven (RTFO) Test measures the effect of heat and air on a moving film of hot mix asphalt binder, simulating short-term aging that occurs during production and paving operations. This is important for investigating and predicting early age HMA pavement behavior and distress.

RTFO Test Procedure

  1. A sample of asphalt binder is heated and dispensed into special glass specimen bottles
  2. The bottles are mounted horizontally in a carousel in the oven
  3. Bottles are rotated at 15rpm for 85 minutes as a jet of 325°F heated air is directed into them
  4. At the completion of the RTFO test, the mass change, viscosity, and other rheological properties are measured
  5. Measurements are then compared to values from unheated samples

For a complete description of the procedure, reference AASHTO T 240 and ASTM D 2872: Effect of Heat and Air on a Moving Film of Asphalt.

The Benefits:

RTFO’s offer several benefits that traditional thin-film ovens do not provide.

  • Carousel continuously exposes heat and airflow with a consistent rolling action
  • Keeps asphalt binder modifiers dispersed
  • Eliminate surface skin, which can inhibit the aging of asphalt binder
  • Expedite test times, taking just 85 minutes on average
  • Improve test accuracy and repeatability
  • Offer simple operation with minimal training required

What Gilson’s Cooking Up

Gilson’s new MO-36 Rolling Thin Film Oven, manufactured in cooperation with ATS is complete with an advanced design, durable construction, and reliable accuracy to easily measure the effect of heat and air on asphalt binder.

Precision components are controlled for precise, repeatable results and straightforward operation with minimal training required. A built-in timer controls test times and temperature control is easily programmed for temperatures up to 246°C (475°F), promoting uniformity and repeatability. A uniquely designed carousel is faster and easier to load and eliminates scratched and damaged bottles. The rugged and accurate Gilson RTFO is CE-marked, made in the USA and meets all test method specifications while exceeding recovery time requirements.

RTFO

We hope this blog has answered your questions about the RTFO. Please contact our experienced technical support team for detailed information.

About the Author Ben Backus