{"id":73954,"date":"2016-07-22T14:35:41","date_gmt":"2016-07-22T14:35:41","guid":{"rendered":"http:\/\/fabricdigital.com.au\/grt\/?p=73954"},"modified":"2019-07-08T05:10:12","modified_gmt":"2019-07-08T05:10:12","slug":"mechanistic-design-determining-the-k-factor","status":"publish","type":"post","link":"https:\/\/globalroadtechnology.com\/mechanistic-design-determining-the-k-factor\/","title":{"rendered":"Mechanistic Design \u2013 Determining the \u2018k\u2019 Factor"},"content":{"rendered":"

In the mechanistic design process, the performance of bound materials including stabilized granular materials, subgrade materials and asphalt is dependent on the input variables that dictate the material performance, also known as the \u2018k\u2019 factor.<\/h3>\n

This factor represents the material specific characteristics when analysed using Austroads standard failure criterion in conjunction with the load induced strain determined by the mechanistic software CIRCLY.<\/p>\n

This method is only relative to bound materials (and subgrade materials) as they are considered to be subject to failure mechanisms (fatigue in both asphalt and cemented materials and rutting in subgrade materials) contrary to the use of unbound or modified granular materials.<\/p>\n

When calculating the \u2018k\u2019 factor for the relevant materials, the following input characteristics are required:<\/p>\n

Asphalt<\/strong><\/p>\n

    \n
  1. a) Binder Content \u2013 The binder content also known as the voids filled by bitumen (vb) is required and typically represents the elasticity or resilience to fatigue failure of the mix.<\/li>\n
  2. b) Resilient Modulus \u2013 The modulus or the \u2018stiffness\u2019 of the mix and is generally proportional to the load induced strain under a nominal wheel loading.<\/li>\n<\/ol>\n

    \"high-modulus-asphalt-global-road-technology\"<\/strong><\/p>\n

    Cemented Materials<\/strong><\/p>\n

      \n
    1. a) \u2013 Resilient Modulus -Contrary to the determining a \u2018k\u2019 factor for asphalt<\/a>, cemented material does not require a \u2018binder content\u2019 as an input variable, but rather is calculated solely on the resilient modulus and the load induced strain.<\/li>\n<\/ol>\n

      Subgrade Materials<\/strong><\/p>\n

        \n
      1. b) Similar to cemented materials, the subgrade \u2018k\u2019 factor is dependent on the resilient modulus and the load induced strain.<\/li>\n<\/ol>\n

        It is highlighted that for cemented materials, in the absence of material specific resilient modulus testing, Austroads have presented a correlation of between 1000 and 1250 factor multiplied by the 28-day UCS of the material and generally limits the allowable resilient modulus to 10,000MPa.<\/p>\n

        For subgrade materials, in absence of material specific testing, Austroads <\/a>outlines an empirical relationship that is commonly adopted using conventional California Bearing Ratio (CBR) testing and a factor that ranges from 10-15 with an upper limit of 150MPa.<\/p>\n

        The benefits of comprehending and dictating specific performance characteristics in design can provide significant benefits \u2013 particularly when determining a mix design for insitu cement stabilised granular material or hot insitu recycled asphalt material.<\/p>\n

        For more information on Global Road Technology or Mechanistic Design and Determining the \u2018k\u2019 Factor please Contact Us<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

        In the mechanistic design process, the performance of bound materials including stabilized granular materials, subgrade materials and asphalt is dependent […]<\/p>\n","protected":false},"author":5,"featured_media":73955,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[115],"tags":[],"class_list":["post-73954","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry-articles"],"yoast_head":"\nDetermining the \u2018k\u2019 Factor in Mechanistic Design - GRT<\/title>\n<meta name=\"description\" content=\"The performance of bound materials and asphalt is dependent on the input variables that dictate the material performance, also known as the \u2018k\u2019 factor\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/globalroadtechnology.com\/mechanistic-design-determining-the-k-factor\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Determining the \u2018k\u2019 Factor in Mechanistic Design - 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