A paver, red haul truck, roller, and crew work in the Indiana Soybean Alliance parking lot.

Saturday, 25 July 2026 / Published in Demo Projects, SIP-1111™, SIP-1111™ Rejuv

Indiana Soybean Alliance: The 40% RAP BioMAG™ Section

On October 25, 2020, a full-scale parking-lot demonstration at the Indiana Soybean Alliance headquarters in Indianapolis placed separate control, SIP-1111™, and BioMAG™ test sections. This article covers the distinct BioMAG™ section, which put 40% reclaimed asphalt pavement into a polymer-modified hot-mix asphalt formulation.

BioMAG™ combines 50% SIP-1111™ rejuvenator with 50% biopolymer. The BioMAG™ section used that polymer-and-rejuvenator combination with supplemental SIP-1111™ and a PPA-spiked 70-22S binder, linking reclaimed-binder restoration with high- and low-temperature binder performance.

40% RAP with a combined chemistry strategy

The project tracking record documents liquid BioMAG™ mixed in a tanker truck and held for a two-day reaction period before paving. A companion rejuvenator record for the same date and location documents the supplemental SIP-1111™ addition. The project summary expresses the formulation as 5.4% BioMAG™ plus 1.8% supplemental SIP-1111™ on a total-asphalt-content basis.

The detailed binder table expresses the field blend on a different basis: 9.0% BioMAG™ plus 3.5% SIP-1111™ by neat binder. The two source representations are retained on their stated bases rather than converted. Both identify the combined-chemistry BioMAG™ section, separate from the SIP-1111™-only section evaluated in the Fuel paper.

Binder performance reached approximately PG 64H-28

The project summary reports the resulting binder at approximately PG 64H-28. Its ΔTc was -2°C, three degrees above the summary’s stated passing threshold of greater than -5°C. That result joined a high-temperature H traffic designation with a -28°C low-temperature grade in a 40% RAP design.

Three cracking measures exceeded the project thresholds

The reported mixture results cleared every cracking threshold listed in the project summary:

Indianapolis 40% RAP cracking results and project-summary thresholds
Measure	Reported result	Project threshold	Margin above threshold
I-FIT flexibility index	12	Greater than 8	4 index points
CT index	122	Greater than 80	42 index points
DCT fracture energy	554 J/m²	Greater than 400 J/m²	154 J/m²

I-FIT, CT index, and DCT evaluate cracking resistance through different loading and temperature conditions. Their combined result gives producers and owners a broader performance view than a single specification number, while the binder grade and ΔTc connect the mixture response to recovered-binder behavior.

A production-scale formulation for high-RAP asphalt

The BioMAG™ section demonstrates how BioMAG™ and supplemental SIP-1111™ can work together in a production asphalt formulation. It incorporated 40% RAP, used tanker blending and a defined reaction period, achieved an approximately PG 64H-28 binder, and exceeded the three cracking thresholds reported for the mixture.

The same physical parking lot also contained a separate SIP-1111™-only section. The peer-reviewed Fuel study reports that section at 5.7% SIP-1111™ by neat binder and compares it with the 25% RAP control. Read the SIP-1111™ section article for its recovered-binder, DCT, and Hamburg results.