Balanced Mix Design

Increasing the use of RAP continues to face limitations across the country. However, experts from Ohio, Texas and Michigan offer a message of hope with the advent of BMD.

In early June 2021, Staker Parson executed an innovative test strip at the port of entry, paving a single 6-inch-thick lift of highly polymer-modified asphalt with 1 percent air voids.

In September 2021, Coulson Excavating Company Inc., placed an innovative new mix known in Colorado as BR-ST (bituminous rich, ST ⅜ minus gradation) on a 4-mile section of State Highway 85.

There’s more happening in the world of quality control/quality assurance than finding the most expedient way to implement balanced mix design-favored testing protocol. Let’s take a look at what equipment manufacturers and lab service providers have to offer.

Preliminary testing with the mobile WLB 10 S laboratory plant from Wirtgen Groupenables foamed bitumen quality to be precisely determined in the lab prior to the start of construction by offering one-to-one simulation of the cold recycling process in the lab.

Troxler Electronic Laboratories Inc., Research Triangle Park, North Carolina, recently announced the new, low activity, license-exempt gauge: the EGauge™ Model 4540 asphalt & soil density gauge.

The PQI 380 from TransTech is the fourth-generation non-nuclear asphalt density gauge.