{"id":972,"date":"2026-07-25T01:55:26","date_gmt":"2026-07-25T01:55:26","guid":{"rendered":"http:\/\/localhost:8081\/soyleitechnologies\/sip-1111-biomag-altoona-iowa-20-percent-rap\/"},"modified":"2026-08-01T13:44:06","modified_gmt":"2026-08-01T13:44:06","slug":"sip-1111-biomag-altoona-iowa-20-percent-rap","status":"publish","type":"post","link":"https:\/\/soylei-dev.ecochran.dyndns.org\/soyleitechnologies\/sip-1111-biomag-altoona-iowa-20-percent-rap\/","title":{"rendered":"Altoona, Iowa: BioMAG\u2122 Improves Low-Temperature Grade in a 20% RAP Roadway"},"content":{"rendered":"

On September 10, 2019, an Iowa State University field team brought BioMAG\u2122 to a full-scale city-road demonstration on NE 80th Street in Altoona, Iowa. The hot-mix asphalt carried 20% reclaimed asphalt pavement<\/strong> and used an SBS-modified 58-28H binder.<\/p>\n

BioMAG\u2122 combines 50% SIP-1111\u2122 rejuvenator with 50% biopolymer<\/strong>. The formulation brings asphalt-binder rejuvenation and polymer-network support into a single liquid additive for recycled and polymer-modified mixtures.<\/p>\n

\n \"Two
Crews place the 20% RAP BioMAG\u2122 mixture on the Altoona roadway.<\/figcaption><\/figure>\n

Lower-temperature performance from the same SBS-modified binder<\/h2>\n

Binder testing compared the 58-28H material before modification with the same binder after an 8% BioMAG\u2122 addition<\/strong>. The low critical temperature shifted from -31.0\u00b0C to -33.3\u00b0C<\/strong>. The high critical temperature moved from 65.4\u00b0C to 64.2\u00b0C, expanding the measured PG temperature interval from 96.4\u00b0C to 97.5\u00b0C.<\/p>\n

MSCR recovery at 58\u00b0C increased from 34.81% to 36.05%<\/strong>. The complete comparison recorded a \u0394Tc change from -1.6\u00b0C to -3.0\u00b0C and a Jnr<\/sub> change from 0.9387 to 1.1584 kPa-1<\/sup>.<\/p>\n

\n \"Table
Altoona binder results before BioMAG\u2122, after BioMAG\u2122, and after recovery with 20% RAP.<\/figcaption><\/figure>\n

Performance after recovery with 20% RAP<\/h2>\n

The binder recovered from the field mixture measured a PG range of 66.2\u00b0C to -30.8\u00b0C<\/strong>, a \u0394Tc of -2.2\u00b0C<\/strong>, 42.82% MSCR recovery<\/strong> at 58\u00b0C, and Jnr<\/sub> of 0.8138 kPa-1<\/sup><\/strong>. For comparison, the untreated virgin-binder baseline measured 65.4\u00b0C to -31.0\u00b0C, 34.81% recovery, and Jnr<\/sub> of 0.9387 kPa-1<\/sup>. The comparison documents the binder response after BioMAG\u2122 entered a production mixture carrying 20% reclaimed asphalt.<\/p>\n

A field-scale blending lesson<\/h2>\n

The Altoona material was blended in a tanker and conditioned over four days before paving. Field inspection identified premature polymer crosslinking under that delivery method. Feedback from the terminal, contractor, and Iowa State University team established a clear production requirement for more efficient BioMAG\u2122 mixing and blending.<\/p>\n

What Altoona demonstrates<\/h2>\n

Altoona established a field-scale route for pairing binder rejuvenation with polymer support in recycled asphalt. The project placed a 20% RAP roadway, improved the binder’s low critical temperature by 2.3\u00b0C, increased MSCR recovery at 58\u00b0C, and converted field experience into a defined production-control requirement.<\/p>\n

\n \"Four\n <\/picture>
Altoona binder properties across formulation stages<\/strong> The recovered project binder retained a low-temperature endpoint near the source binder while recording the highest 58\u00b0C MSCR recovery and lowest Jnr of the three stages.<\/figcaption><\/figure>\n
\n

More-negative low endpoint, higher recovery, lower Jnr, and less-negative \u0394Tc are generally favorable; stages are not competing treatments.<\/p>\n

\n\n\n\n\n\n\n\n
Altoona binder properties before modification, after BioMAG modification, and after recovery from the 20% RAP mix.<\/caption>\n
Stage<\/th>\nHigh endpoint (\u00b0C)<\/th>\nLow endpoint (\u00b0C)<\/th>\n\u0394Tc (\u00b0C)<\/th>\nMSCR recovery at 58\u00b0C (%)<\/th>\nJnr at 58\u00b0C (kPa\u207b\u00b9)<\/th>\n<\/tr>\n<\/thead>\n
Source binder<\/th>\n65.4<\/td>\n-31<\/td>\n-1.6<\/td>\n34.81<\/td>\n0.9387<\/td>\n<\/tr>\n
8% BioMAG\u2122<\/th>\n64.2<\/td>\n-33.3<\/td>\n-3<\/td>\n36.05<\/td>\n1.1584<\/td>\n<\/tr>\n
Recovered 20% RAP binder<\/th>\n66.2<\/td>\n-30.8<\/td>\n-2.2<\/td>\n42.82<\/td>\n0.8138<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n

Source: Case Studies in BioMAG, a High Performance Polymer Modifier and InvigoSoy. Altoona demonstration, PDF page 4, Table 3<\/p>\n<\/div>\n

Explore SIP-1111\u2122<\/a> \u00b7 See more demonstration projects<\/a> \u00b7 Discuss a recycled-asphalt formulation with SoyLei<\/a><\/p>\n

Source Documents<\/h2>\n