Assessment of Techcrete : a concrete repair material and joint sealant.

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    Joint sealing and resealing is a commonly performed concrete pavement maintenance activity that serve s two purposes. First, it minimizes water infiltration; second, it prevents intrusion of solid materials in the joints. There are many sealants available for resealing concrete joints including hot - poured, rubberized asphalt sealants and silicone sealants . According to a Federal Highway Administration technology brief, “the hot - poured, rubberized asphalt sealants are less expensive than silicone materials but generally have shorter life expectancies (typically, 4 to 8 years for hot - poured sealants and 5 t o 10 for silicone sealants) [1]. In the fall of 2007, the City of Winooski resealed some of the pavement joints located along US Route 2 and 7 as part of their periodic preventative maintenance work, with a new hot - poured product, TechCrete, manufactured by Crafco. According to Crafco, this flexible material is a hot - poured product for concrete repairs, which provides high tensile strength and high compressive resistance. It is comprised of a combination of several resins, polymers, and aggregate. In ad dition, it has proven to provide a long - term life span in most applications. According to the manufacturer, once the material has properly cured, the materials will not de - bond or crack while remaining flexible during the expansion and contraction of the adjacent concrete slabs. Additionally, the affected lane can be open to traffic within one hour of application. In 2008, Crafco contacted VTrans to have TechCrete added to the Approved Products list. This study is an evaluation of the product. VTran s selected the Winooski site and a site in South Burlington where a concrete pavement was placed in 1997 that exhibited similar deterioration, to conduct a field evaluation of the product.
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