{"id":75061,"date":"2016-03-13T15:06:59","date_gmt":"2016-03-13T15:06:59","guid":{"rendered":"https:\/\/globalroadtechnology.com\/\/?p=75061"},"modified":"2019-07-11T02:07:55","modified_gmt":"2019-07-11T02:07:55","slug":"unsealed-road-design","status":"publish","type":"post","link":"https:\/\/globalroadtechnology.com\/unsealed-road-design\/","title":{"rendered":"Unsealed Road Design"},"content":{"rendered":"

Unsealed Road Design \u2013 Unsealed roads are a cost effective method of providing transport solutions, particularly in rural locations in which the use of a spray seal or asphalt surfacing would not be economical.<\/h3>\n

These often include links to isolated communities, rural freight corridors and emergency tracks. Given the generally low traffic nature of these roads, the successful practise of unsealed road building and design is focused around managing environmental conditions to satisfy safety requirements and limit routine expenditure, Global Road Technology products<\/a> offer many advantages to unsealed road design.<\/p>\n

Whilst all unsealed road applications are considered to be similar in nature, the structural requirements vary, based upon the functional road category and importance. Austroads Guide to Pavement Technology outlines a 5-class system, comprising:<\/p>\n

U1 (AADT >200)<\/strong> \u2013 A high quality unsealed application incorporating quarried gravel at a minimum 100mm thick as a wearing course, 150mm thick as a base course and 150mm thick as a subbase course.<\/p>\n

U2 (AADT 100 \u2013 200)<\/strong> \u2013 A moderate to high quality unsealed application incorporating quarried gravel at a minimum 100mm thick as a wearing course, 150mm thick as a base course and no use of a subbase course.<\/p>\n

U3 (AADT 20-100) \u2013<\/strong> A moderate quality unsealed application that incorporates either quarried or natural materials at a minimum 100mm thick wearing course and 150mm subbase<\/p>\n

U4 (AADT <20) \u2013 <\/strong>A moderate \u2013 low standard unsealed application that incorporates predominantly natural gravel as a wearing course a minimum of 150mm thick<\/p>\n

U5 (<10) \u2013 <\/strong>A low standard application that incorporates the existing subgrade material once cleared of vegetation and undesirable material<\/p>\n

Whilst the pavement thickness is paramount to the successfulness of a pavement structure, consideration must be given to achieving desired material properties to manage:<\/p>\n

    \n
  1. a) Dustiness and a loss of Cohesion\u2013 The pavement material must contain enough high plasticity fines to provide cohesion to allow bonding with the surrounding material. If this is not managed it can present safety issues to the road user and compromised waterproofing<\/li>\n
  2. b) Structural Requirements \u2013 The pavement material must be stable enough to resist deformation under wheel loads, which includes optimising the particle grading\u2019s and hardness using available material. This can lead to increased pavement deterioration including corrugating and rutting.<\/li>\n
  3. c) Waterproofing \u2013 The pavement material must contain enough plasticity in the fines to enable particle cohesion and a \u2018tight\u2019 finish to reduce moisture ingress and increased deterioration of the pavement. The use of greater than normal cross-falls (4-6%) to facilitate surface drainage<\/li>\n<\/ol>\n

    An indicator of good pavement performance in an unseal application firstly is the safety and rideability to the road user, followed by the routine maintenance expenditure.<\/p><\/blockquote>\n

    For more information on Global Road Technology or unsealed road design please contact us<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

    Unsealed Road Design \u2013 Unsealed roads are a cost effective method of providing transport solutions, particularly in rural locations in […]<\/p>\n","protected":false},"author":5,"featured_media":75037,"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-75061","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry-articles"],"yoast_head":"\nCost Effective Unsealed Road Design - Global Road Technology<\/title>\n<meta name=\"description\" content=\"Unsealed roads are a cost effective method, particularly in rural locations where the use of a spray seal or asphalt surfacing would not be economical.\" \/>\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\/unsealed-road-design\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cost Effective Unsealed Road Design - 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