The Mason City demonstration results compare a 45% RAP design with SIP-1111™ against a matched 45% RAP TuffTrek design. The SIP-1111™ design reports the higher CT Index and DCT fracture energy in that comparison.
Reported high-RAP comparison
In the source deck’s 45% RAP summary comparison, the SIP-1111™ design reports a Cracking Tolerance Index of 119.4 and DCT fracture energy of 490.67 J/m². The TuffTrek design reports CT Index 101.54 and DCT fracture energy of 363 J/m². Higher values indicate stronger cracking-test response for both measures.
The deck also reports a 35% RAP control at CT Index 104.22 and DCT fracture energy 480.33 J/m². That control uses a different binder and RAP design, so the direct high-RAP product comparison remains the two 45% RAP designs.
What the result means
Mason City gives producers a direct, same-RAP comparison between SIP-1111™ and another recycling-agent design. The result pairs 45% recycled content with stronger reported values in two complementary cracking tests.
Higher CT Index and DCT fracture energy are favorable.
| Treatment | RAP (%) | CT Index | DCT fracture energy (J/m²) |
|---|---|---|---|
| TuffTrek | 45 | 101.54 | 363 |
| SIP-1111™ | 45 | 119.4 | 490.67 |
Source: SIP-1111™ Demo Paving Results. Slide 5, Mason City, IA Demonstration Results, second and third rows
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Source Documents
- SIP-1111™ Demonstration Paving Results, SoyLei Innovations, 2025
