A paver and orange roller place a black asphalt mat beside fields at the BioCentury Research Farm.

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

Boone, Iowa: 18% RAP and Polymer Performance with BioMAG™

On November 8, 2019, Iowa State University and its partners paved the north parking lot at the BioCentury Research Farm near Boone, Iowa. The United Soybean Board showcase paired 18% reclaimed asphalt pavement with a formulation containing 6% BioMAG™ and 2% SBS.

BioMAG™ combines 50% SIP-1111™ rejuvenator with 50% biopolymer. The Boone project put that formulation into full-scale hot-mix production while measuring continuous binder grade, ΔTc, and Multiple Stress Creep Recovery before modification and after RAP recovery.

Aerial view of paving at the BioCentury Research Farm north parking lot near Boone, Iowa. — Full-scale placement at the BioCentury Research Farm north parking lot.

A terminal-ready blending sequence

The Boone team concentrated BioMAG™ with SBS to promote interaction between the materials, then diluted the concentrate to the target formulation. Bituminous Materials blended the liquid binder before delivery to the paving contractor. The project tracking record documents vessel blending at the terminal over three and a half days before shipment.

This production sequence connected soybean-based rejuvenation and polymer chemistry with existing terminal and contractor equipment. The final formulation used 2% SBS; the project case study identified 4–5% SBS as the typical range for the reported elastic recovery.

Paver and roller placing the BioMAG asphalt mixture during the Boone demonstration. — Paving and compaction of the BioMAG™ demonstration mixture.

Broader grade range with 2% SBS

The unmodified 64-24 source binder measured continuous critical temperatures of 66.2°C and -24.3°C. After modification with 6% BioMAG™, 2% SBS, and 0.13% sulfur, the binder measured 69.9°C and -30.5°C. That expanded the continuous temperature range from 90.5°C to 100.4°C while improving both the high- and low-temperature endpoints.

At 58°C, MSCR recovery increased from 1.21% to 59.63%, while J_nr decreased from 1.45 to 0.4006 kPa^-1. The modified binder also recorded 40.61% recovery and 1.1802 kPa^-1 J_nr at 64°C.

Performance after 18% RAP recovery

Binder recovered from the 18% RAP mix measured continuous critical temperatures of 71.8°C and -29.9°C, a ΔTc of +1.0°C, and 48.58% MSCR recovery at 58°C. Its J_nr measured 0.3861 kPa^-1 at 58°C and 1.1027 kPa^-1 at 64°C.

Boone binder results reported in the BioMAG™ case study
Binder condition	Continuous PG endpoints	ΔTc	MSCR at 58°C	MSCR at 64°C
64-24 source binder	66.2 / -24.3°C	-1.1°C	1.21% recovery; 1.45 kPa^-1 J_nr	Not reported
6% BioMAG™ + 2% SBS	69.9 / -30.5°C	+0.3°C	59.63% recovery; 0.4006 kPa^-1 J_nr	40.61% recovery; 1.1802 kPa^-1 J_nr
Recovered with 18% RAP	71.8 / -29.9°C	+1.0°C	48.58% recovery; 0.3861 kPa^-1 J_nr	31.05% recovery; 1.1027 kPa^-1 J_nr

What Boone demonstrates for asphalt teams

Boone brought terminal blending, polymer extension, reclaimed asphalt, and full-scale placement into one production sequence. With only 2% SBS, the BioMAG™ formulation delivered a 100.4°C continuous grade span before RAP recovery. After 18% RAP entered the mix, the recovered binder retained a -29.9°C low-temperature endpoint, positive ΔTc, and 48.58% MSCR recovery at 58°C.