{"id":75175,"date":"2016-01-18T00:58:33","date_gmt":"2016-01-18T00:58:33","guid":{"rendered":"https:\/\/globalroadtechnology.com\/\/?p=75175"},"modified":"2019-07-08T04:45:46","modified_gmt":"2019-07-08T04:45:46","slug":"reviewing-the-polymer-cement-modification-fatigue-criterion","status":"publish","type":"post","link":"https:\/\/globalroadtechnology.com\/reviewing-the-polymer-cement-modification-fatigue-criterion\/","title":{"rendered":"Reviewing the Polymer Cement Modification Fatigue Criterion"},"content":{"rendered":"

In pavement design principles, the use of a \u2018post\u2019 cracked life is designed for in heavily bound cemented materials once the \u2018pre\u2019 cracked life is consumed and is based on the theory that the effective plastic strain limit is reached for the cemented material which undergoes an isotropic \u2013 anisotropic behaviour transition.<\/h3>\n

With the increased use of Polymer Cement Modification, it is believed the additional flexibility provided by the cementitious cross-linking of the polymer may not be representative of traditional principals adopted for cement may be altered given the increased plastic behaviour of the composite material (much like the flexural behaviour gained with the use of reinforced steel in a concrete beam).<\/p>\n

When nominating the design parameters for a traditional cement treated pavement, the conventional cemented fatigue relationship is adopted which is a correlation derived from Unconfined Compressive Strength<\/a> (UCS) and micro-strain in isolation to determine the effective remaining fatigue life. This relationship has been developed on the characteristic behaviour and brittle nature of conventional cemented gravel and makes no allowance for the increased flexural strength provided by the Polymer Cement Modification (PCM).<\/p>\n

To incorporate a Polymer Cement Modification (PCM) material into the conventional cemented fatigue relationship, it is expected that a PCM factor may be applied depending on the Polymer Cement Modification PCM concentration and composition of polymer.<\/p>\n

Where:<\/strong><\/p>\n

N = allowable number of repetitions of the load<\/p>\n

\u03bce = load induced micro-strain at the base of the cemented material<\/p>\n

E = cemented material modulus<\/p>\n

RF = desired reliability factor<\/p>\n

PCMF<\/sub> = Polymer Cemented Factor (determined by fatigue testing)<\/p>\n

It is expected with the addition of the polymer and the additional flexural strength that the bound cemented material may result in a reduced stiffness and a significantly higher fatigue exponent, providing a flexible and durable pavement material.<\/p>\n

This concept infers that the pavement material provides a significantly greater \u2018pre\u2019 cracked phase and is considered to provide the stiffness benefits of a Cement Treated Base (CTB) pavement material with an extended and prolonged fatigue life.<\/p>\n

The benefits of extending the \u2018pre\u2019 cracked performance life of a bound material provides additional stiffness to the overlying pavement layers and support over the underlying pavement layers.<\/p>\n

This increased flexibility and durability is expected behave in a bridging manner, spreading the load effectively, reducing the rutting potential and provides additional resistance to overloaded vehicles.<\/p><\/blockquote>\n

For more information on Polymer Cement Modification (PCM) or Global Road Technology please contact us<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

In pavement design principles, the use of a \u2018post\u2019 cracked life is designed for in heavily bound cemented materials once […]<\/p>\n","protected":false},"author":5,"featured_media":75129,"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-75175","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry-articles"],"yoast_head":"\nReviewing the Polymer Cement Modification Fatigue Criterion - GRT<\/title>\n<meta name=\"description\" content=\"It is expected that a PCM factor may be applied depending on the Polymer Cement Modification (PCM) concentration and composition of polymer.\" \/>\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\/reviewing-the-polymer-cement-modification-fatigue-criterion\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Reviewing the Polymer Cement Modification Fatigue Criterion - 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