FLORIDA DOT
Based on contracted research with Texas A&M Transportation Research Institute, SP-9.5 mixtures of various aggregate types were shown to be just as rut resistant as SP-12.5 mixtures and will now be allowed to be used in FDOT's highest traffic level roadways.
We’ve increased the minimum AC content in open-graded friction courses to 6.5% for Florida limestone mixtures and 6.0% for granite mixtures.
We’re limiting the maximum storage temperature for polymer modified binders to 355°F.
ILLINOIS DOT
IDOT is adding a special provision allowing designers to specify longitudinal joint sealant in half-width applications such as inlays and narrow stage construction.
INDIANA DOT
INDOT has incorporated spray pavers for use with dense-graded HMA into our paving program. We are targeting interstates, 4-lane divided highways, and freeway-like roadways. This allows us to use a polymer modified emulsion without it being tracked away by construction traffic.
MONTANA DOT
We just published a significant revision of our Section 400 - Plant Mix Pavement specification https://www.mdt.mt.gov/other/webdata/external/const/specifications/2020/SPEC-BOOK/2020-SPEC-BOOK-V3-1.pdf. Main revisions involve removing the restriction of sampling the first 100 tons of mix (since we still pay full price for that material) and an update and clarification to our Hamburg field acceptance specification. Originally, the difference between 12 mm and 13 mm rut depth meant full pay or remove and replace. So, we've been working on a tiered level of acceptance based on binder grade, rut depth, depth of pavement, and traffic level (bike paths vs. interstates).
We’re also working on implementing MSCR and had a kickoff meeting in the spring, but we need to follow up with our pavement design folks to make sure everyone is on the same page, update the pavement design guide, and then roll out the specification via special provision in contracts– hopefully next season. We had our first job with MSCR binder via change order, and all went well for the small quantity it represented.