Better Roads

February 2014

Better Roads Digital Magazine

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Better Roads February 2014 5 RoadScience by Tom Kuennen, Contributing Editor I nnovative materials for road and bridge construc- tion will be exhibited at ConExpo-Con/Agg 2014 in March in Las Vegas, and many of them are worth close examination for the exceptional engineering that distinguishes them. Last month, Road Science scrutinized noteworthy road con- struction equipment technology at ConExpo-Con/Agg. In this issue we look at the science and technology of select road construction materials to be exhibited at the show, all of which are proprietary products. Plan now to attend ConExpo-Con/Agg 2014 in Las Vegas March 4-8. Visit for more information. Fiberglass strand grid for pavements An engineered pavement grid system has the ability to prolong pavement life while permitting higher loads with thinner asphalt lifts, according to the manufacturer Tensar International Corp. (booth No. 64927 in the Technology & Construction Solutions pavilion in South Hall 2). The GlasGrid pavement reinforcement system is composed of fi berglass strands coated with an elastomeric polymer and formed into a grid structure. Each strand has a high tensile strength and high modulus of elasticity; that's important be- cause asphalt concrete typically cracks at low strains. Fatigue and refl ective cracking in pavements generally are caused by traffi c loading, age hardening or temperature cycling. When cracking is present, the traditional remedy has been to apply thicker asphalt overlays. For each inch of applied overlay, existing cracks are generally deterred from refl ecting to the surface for a period of one year. When the GlasGrid system is sandwiched between the leveling course and the surface course in an asphalt overlay, it strengthens the pavement, turning vertical crack stresses horizontally to dissipate them. This once every-three-years trade show boasts innovative materials that deserve a closer look. Materials that Make a Difference On mill-and-fi ll project on busy Florida A1A/528 on Merritt Island, Trackless Tack from Blacklidge Emulsions is placed in advance of overlay. Photo courtesy of Tom Kuennen

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