Asphalt Reinforcement Geogrid Road Application
TE-FGC10 Geogrid (Fiberglass composite grid with thicker nonwoven geotextile) TE-FGP10 Geogrid (Fiberglass grid alone) TE-FGS10 Geogrid (Fiberglass composite grid with very thin nonwoven geotextile)
WHAT: Asphalt pavement road rehabilitation Calgary, Alberta, Canada
APPLICATION: This application involves three asphalt road rehabilitation projects using polymer coated fiberglass grids and fiberglass grid–geotextile composites, to reinforce asphalt concrete pavement (ACP) overlays to enhance their resistance to reflection and fatigue cracking and rutting. CHALLENGE: One of the important challenges faced by any city is the effective maintenance of the roads in its jurisdiction. Asphalt pavements experience various modes of distress like wheel path rutting, fatigue cracks, longitudinal and transverse cracks, and edge cracking which compromises the structural strength and riding quality of the pavement. The City of Calgary carries out maintenance and rehabilitation of the pavements periodically and in some cases, where the pavements have undergone extensive damage, reconstruction of the pavement also is carried out. A condition assessment showed that nearly one quarter of the city’s road network, 3,300 lane kilometers or 2,050 lane miles had met trigger for rehabilitation. This backlog translated to more than 10 years of worth of budget, but allocated budget was only sufficient to treat about 275 lane kilometers or 170 lane miles. Faced with construction and monitory constraints, the City of Calgary started exploring innovative and cost-effective methods for pavement rehabilitation. CONVENTIONAL SOLUTION: As with most urban pavement, milling and overlay/inlay is extensively used for rehabilitation of distressed asphalt pavements, however this does nothing to enhance pavement performance or longevity.
TITAN SOLUTION: Titan proposed that the City of Calgary explore the benefits of using TE-FGS10, TE-FGC10 and TE-FGP10 asphalt reinforcement geogrids with the objective of enhancing pavement performance, longevity and providing long-term cost efficiencies. Developed through rigorous R&D and a series of technological advancements, these fiberglass geogrids are designed to improve the service life of roads. Their high tensile modulus reinforces the asphalt thus enhancing resistance to fatigue cracking and rutting. As a result, the asphalt pavement can be less thick yet have the same structural strength as unreinforced asphalt pavement of greater thickness. With the fiberglass composite geogrid, the grid is bonded to a nonwoven geotextile and provides the following additional benefits: • When saturated with tack coat the nonwoven geotextile becomes an impervious membrane which acts as a moisture barrier preventing the entry of surface water into the pavement. • The geotextile is generally considered to help installation by providing better bond to the existing pavement. Under favourable conditions this facilitates installing the fiberglass composite geogrid directly on milled surfaces, thereby avoiding a leveling course.
The City of Calgary, decided to carry out pilot studies in three locations to monitor performance– two roads with curb and gutter namely Sarcee Trail and 50 th Ave., and rural road 101 Street SW. Specifics on each follow:
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