Required thickness of the sub-base layer for flexible pavements on highway embankments constructed of poor materials

Kavvadas, M; Fortsakis, P; Prountzopoulos, G; Papakonstantinou, A

dc.contributor.author	Kavvadas, M	en
dc.contributor.author	Fortsakis, P	en
dc.contributor.author	Prountzopoulos, G	en
dc.contributor.author	Papakonstantinou, A	en
dc.date.accessioned	2014-03-01T02:51:10Z
dc.date.available	2014-03-01T02:51:10Z
dc.date.issued	2007	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/35416
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-84858027801&partnerID=40&md5=bac3623a7ac5b9045ea4607b854f8e30	en
dc.subject.other	Asphalt surfacing	en
dc.subject.other	Base layers	en
dc.subject.other	CBr	en
dc.subject.other	Compressive strain	en
dc.subject.other	Environmental costs	en
dc.subject.other	Environmental implications	en
dc.subject.other	Flexible pavements	en
dc.subject.other	Highway embankments	en
dc.subject.other	Mechanical characteristics	en
dc.subject.other	Neo genes	en
dc.subject.other	Pavement structures	en
dc.subject.other	Quality materials	en
dc.subject.other	Soil materials	en
dc.subject.other	Sub-bases	en
dc.subject.other	Highway engineering	en
dc.subject.other	Soil mechanics	en
dc.subject.other	Tensile strain	en
dc.subject.other	Materials	en
dc.title	Required thickness of the sub-base layer for flexible pavements on highway embankments constructed of poor materials	en
heal.type	conferenceItem	en
heal.publicationDate	2007	en
heal.abstract	The use of poor quality materials (such as flysch and stiff neogene clays) as fills in the construction of highway embankments has significant financial and Environmental implications. Such materials often become available in large volumes, from deep cut excavations and, if not used in nearby embankments, they must be disposed as spoil at high monetary and Environmental cost. This paper investigates the requirements for the use of poor soil materials (CBR < 5%) in the body of highway embankments as subgrades for flexible asphalt pavements. Parametric finite-element analyses are performed to calculate the horizontal tensile strain at the bottom of the asphalt base and the vertical compressive strain at the bottom of the improved subgrade for pavement structures met in practice. These Values are compared with corresponding results of typical flexible pavements on good quality subgrades designed according to the AASHTO (1993) method. Based on this comparison, a method is proposed to determine the required thickness of the sub-base layer as a function of the sub-grade quality (expressed in terms of its CBR value), making the practical assumption that the thickness and mechanical characteristics of the asphalt surfacing and the aggregate base layer are constant in all cases. © 2007 Taylor & Francis Group, London.	en
heal.journalName	Advanced Characterisation of Pavement and Soil Engineering Materials - Proceedings of the International Conference on Advanced Characterisation of Pavement and Soil Engineering Materials	en
dc.identifier.volume	1	en
dc.identifier.spage	629	en
dc.identifier.epage	638	en