{"id":75150,"date":"2016-01-31T05:41:43","date_gmt":"2016-01-31T05:41:43","guid":{"rendered":"https:\/\/globalroadtechnology.com\/\/?p=75150"},"modified":"2019-07-22T02:28:07","modified_gmt":"2019-07-22T02:28:07","slug":"background-to-spray-seal-design","status":"publish","type":"post","link":"https:\/\/globalroadtechnology.com\/background-to-spray-seal-design\/","title":{"rendered":"Background to Spray Seal Design"},"content":{"rendered":"

Spray seal is a process that involves the application of a bituminous binder followed by the spreading of stone at a nominal size, primarily used to act as a waterproofing layer but is also used for a number of applications, including:<\/h3>\n
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  1. a) Wearing Course<\/strong><\/li>\n<\/ol>\n

    Spray seals are a proven cost effective wearing course, often used in low traffic applications, typically in the form of single coat or double coat configurations.<\/p>\n

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    1. b) Priming Course<\/strong><\/li>\n<\/ol>\n

      Spray seals used as a \u2018priming\u2019 course are commonly used in granular pavements to provide a bonding interlayer for asphalt or spray seal wearing course to adhere to. When used as a priming course, the inclusion of cutter is typically used to reduce the viscosity of the bituminous material to penetrate the granular material.<\/p>\n

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      1. c) Strain Alleviating Membrane (SAM)<\/strong><\/li>\n<\/ol>\n

        Spray seals are often used on new and existing pavements that are subject to a high likelihood of reflective cracking behaviour through the surfacing. When used as a SAM, these seals are designed to have a higher binder application rate and commonly adopt polymer modified bitumen to provided additional interlayer elasticity and increased crack retardation.<\/p>\n

        The process of determining the suitable treatment and application rate is based around due consideration of individual project and environmental factors, including:<\/p>\n