{"id":960,"date":"2026-07-25T01:55:25","date_gmt":"2026-07-25T01:55:25","guid":{"rendered":"http:\/\/localhost:8081\/soyleitechnologies\/sip-1111-ncat-test-track-s1-high-rap\/"},"modified":"2026-08-01T13:44:05","modified_gmt":"2026-08-01T13:44:05","slug":"sip-1111-ncat-test-track-s1-high-rap","status":"publish","type":"post","link":"https:\/\/soylei-dev.ecochran.dyndns.org\/soyleitechnologies\/sip-1111-ncat-test-track-s1-high-rap\/","title":{"rendered":"NCAT Test Track Section S1: A 50% RAP SIP-1111\u2122 Field Section"},"content":{"rendered":"

NCAT Test Track Section S1 paired a 50% RAP<\/strong> surface mixture with SIP-1111\u2122 at 4.1% by weight of total asphalt binder<\/strong>. After one year of heavy truck traffic and about 4 million ESALs, the section had no visible surface cracking and less than 3.5 mm of rut depth.<\/p>\n

Balanced mix design selected the field dosage<\/h2>\n

The 12.5-mm dense-graded design used 50% RAP and PG 67-22 virgin binder. IDEAL-CT testing at 25\u00b0C increased from a CT Index of 32.2 without rejuvenator<\/strong> to 57.7 at 4.1% SIP-1111\u2122<\/strong>. The selected dosage exceeded the paper’s stated minimum CT Index of 50 for Alabama surface mixtures.<\/p>\n

Hamburg testing checked the other side of the balanced-design decision. At 4.1% SIP-1111\u2122, the mixture recorded 4.6 mm of rut depth after 10,000 passes<\/strong>, below the 10-mm ALDOT wearing-surface limit cited in the paper. Testing was performed at 50\u00b0C under AASHTO T 324.<\/p>\n

One-year field results<\/h2>\n
\n\n\n\n\n\n\n\n\n
Measure<\/th>\nSection S1 result<\/th>\nCondition<\/th>\n<\/tr>\n<\/thead>\n
Surface cracking<\/td>\nNo visible cracking<\/td>\nOne year; about 4 million ESALs<\/td>\n<\/tr>\n
Rut depth<\/td>\nLess than 3.5 mm<\/td>\nOne year; about 4 million ESALs<\/td>\n<\/tr>\n
IRI<\/td>\n1.0-1.2 m\/km<\/td>\nOne year; about 4 million ESALs<\/td>\n<\/tr>\n
Mean Profile Depth<\/td>\n1.0 mm to 0.7 mm<\/td>\nOne year; about 4 million ESALs<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n

A direct path from mix design to trafficking<\/h2>\n

Section S1 connects laboratory dosage selection, continuous-plant production, full-scale placement, and accelerated trafficking in one high-RAP program. Producers can evaluate the same 4.1% total-binder dosage across cracking, rutting, ride quality, and surface texture rather than relying on a single laboratory measure.<\/p>\n

\n \"Bar\n <\/picture>
NCAT S1 IDEAL-CT response at 50% RAP<\/strong> IDEAL-CT Index increased across the tested dosage series, crossing the cited CT Index threshold of 50 between 2.5% and 3.5%.<\/figcaption><\/figure>\n
\n

Higher IDEAL-CT Index is favorable; the source cites a threshold of 50.<\/p>\n

\n\n\n\n\n\n\n\n\n
IDEAL-CT results for the NCAT S1 50% RAP dosage series.<\/caption>\n
SIP-1111\u2122 dosage (% total binder)<\/th>\nIDEAL-CT Index<\/th>\nReplicates<\/th>\nSource threshold<\/th>\n<\/tr>\n<\/thead>\n
0<\/th>\n32.2<\/td>\n5<\/td>\n50<\/td>\n<\/tr>\n
2.5<\/th>\n49.2<\/td>\n5<\/td>\n50<\/td>\n<\/tr>\n
3.5<\/th>\n54.2<\/td>\n5<\/td>\n50<\/td>\n<\/tr>\n
4.1<\/th>\n57.7<\/td>\n5<\/td>\n50<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n

Source: Field Evaluation of Soy-Based Recycling Agent in High-RAP Asphalt Mixtures<\/a>. Section 3.1 and Figure 1, PDF page 3<\/p>\n<\/div>\n

Review SIP-1111\u2122<\/a> \u00b7 See related demonstration projects<\/a> \u00b7 Discuss a high-RAP field evaluation with SoyLei<\/a><\/p>\n

Source Documents<\/h2>\n