{"id":976,"date":"2026-07-25T01:55:26","date_gmt":"2026-07-25T01:55:26","guid":{"rendered":"http:\/\/localhost:8081\/soyleitechnologies\/sip-1111-biomag-st-joseph-25-percent-rap\/"},"modified":"2026-08-01T13:44:06","modified_gmt":"2026-08-01T13:44:06","slug":"sip-1111-biomag-st-joseph-25-percent-rap","status":"publish","type":"post","link":"https:\/\/soylei-dev.ecochran.dyndns.org\/soyleitechnologies\/sip-1111-biomag-st-joseph-25-percent-rap\/","title":{"rendered":"St. Joseph: 25% RAP Holds the Modified Binder Grade"},"content":{"rendered":"

On November 14, 2019, a city-street demonstration on West Cliff Street in St. Joseph, Missouri, put 25% reclaimed asphalt pavement<\/strong> into a polymer-modified asphalt mixture built with BioMAG\u2122.<\/p>\n

BioMAG\u2122 combines 50% SIP-1111\u2122 rejuvenator<\/strong> with 50% biopolymer<\/strong>. The St. Joseph project tested how that chemistry worked with SBS in a terminal-blended binder, then measured the binder recovered from the completed 25% RAP mixture.<\/p>\n

The recovered 25% RAP binder held the grade range<\/h2>\n

Before RAP entered the mixture, the modified binder tested at a continuous PG of 71.4\/-30.3<\/strong> with a 0.6\u00b0C \u0394Tc<\/strong>. Binder recovered from the 25% RAP mixture tested at 71.8\/-29.9<\/strong> with a 1.0\u00b0C \u0394Tc<\/strong>.<\/p>\n

The high- and low-temperature endpoints moved by only 0.4\u00b0C after RAP was incorporated. The recovered binder therefore retained the modified binder’s 101.7\u00b0C continuous grade span while carrying 25% recycled asphalt.<\/p>\n

MSCR results quantify the polymer response<\/h2>\n

The binder formulation listed 6.0% BioMAG\u2122, 2.00% SBS, and 0.13% sulfur<\/strong>. Before RAP, it recorded 66.52% MSCR recovery with Jnr 0.30 at 58\u00b0C<\/strong> and 51.45% recovery with Jnr 0.77 at 64\u00b0C<\/strong>.<\/p>\n

After recovery from the 25% RAP field mixture, the binder recorded 55.11% recovery with Jnr 0.26 at 58\u00b0C<\/strong> and 38.67% recovery with Jnr 0.75 at 64\u00b0C<\/strong>. These paired results provide the direct comparison asphalt teams need: polymer response measured before recycled material entered the mix and again in binder recovered from the placed mixture.<\/p>\n

BioMAG\u2122 expanded both ends of the starting binder grade<\/h2>\n

The unmodified starting binder tested at a continuous PG of 66.2\/-24.3<\/strong> with a -1.1\u00b0C \u0394Tc<\/strong>. After modification, the high-temperature endpoint increased by 5.2\u00b0C, the low-temperature endpoint moved 6.0\u00b0C colder, and \u0394Tc moved to 0.6\u00b0C.<\/p>\n

The case study also compared the 2.00% SBS formulation with the greater than 4-5% SBS dosage it identified as typical for achieving the reported elastic recovery. St. Joseph demonstrates a practical route for extending polymer performance while preserving a wide binder grade range in a 25% RAP mixture.<\/p>\n

Terminal blending carried through to a city street<\/h2>\n

The project tracking record documents vessel blending at the asphalt terminal before delivery to the contractor. The field case study reports more than ten days of hot storage and stable binder performance through that extended holding period.<\/p>\n

For terminals and producers, the result connects formulation, storage, recycled-content production, and recovered-binder verification in one commercial-scale project. The key field takeaway is concrete: 25% RAP with a recovered continuous PG of 71.8\/-29.9, a 1.0\u00b0C \u0394Tc, and 38.67% MSCR recovery at 64\u00b0C<\/strong>.<\/p>\n

\n \"Five\n <\/picture>
St. Joseph binder response before and after 25% RAP<\/strong> After recovery from the 25% RAP mixture, the binder retained its continuous grade range and substantial MSCR response.<\/figcaption><\/figure>\n
\n

Higher recovery and lower Jnr are favorable; the two states are stages of one formulation.<\/p>\n

\n\n\n\n\n\n\n
St. Joseph modified binder and recovered 25% RAP binder properties.<\/caption>\n
Binder state<\/th>\nHigh endpoint (\u00b0C)<\/th>\nLow endpoint (\u00b0C)<\/th>\n\u0394Tc (\u00b0C)<\/th>\nRecovery 58\u00b0C (%)<\/th>\nJnr 58\u00b0C (kPa\u207b\u00b9)<\/th>\nRecovery 64\u00b0C (%)<\/th>\nJnr 64\u00b0C (kPa\u207b\u00b9)<\/th>\n<\/tr>\n<\/thead>\n
Modified before RAP<\/th>\n71.4<\/td>\n-30.3<\/td>\n0.6<\/td>\n66.52<\/td>\n0.3<\/td>\n51.45<\/td>\n0.77<\/td>\n<\/tr>\n
Recovered from 25% RAP<\/th>\n71.8<\/td>\n-29.9<\/td>\n1<\/td>\n55.11<\/td>\n0.26<\/td>\n38.67<\/td>\n0.75<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n

Source: Thermoplastic Elastomers Derived From Vegetable Oils. St. Joseph BioMAG section, Figure 3 and Table 5, PDF page 6<\/p>\n<\/div>\n

Review SIP-1111\u2122<\/a> \u00b7 See related demonstration projects<\/a> \u00b7 Discuss a high-RAP or polymer-modified binder program with SoyLei<\/a><\/p>\n

Source Documents<\/h2>\n