Moisture content effect on permanent deformation behaviour of unbound granular materials

Alnedawi, Ali, Nepal, Kali Prasad and Al-Ameri, Riyadh 2018, Moisture content effect on permanent deformation behaviour of unbound granular materials, International journal of civil engineering and technology, vol. 9, no. 10, pp. 1856-1862.

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Title Moisture content effect on permanent deformation behaviour of unbound granular materials
Author(s) Alnedawi, AliORCID iD for Alnedawi, Ali
Nepal, Kali PrasadORCID iD for Nepal, Kali Prasad
Al-Ameri, RiyadhORCID iD for Al-Ameri, Riyadh
Journal name International journal of civil engineering and technology
Volume number 9
Issue number 10
Start page 1856
End page 1862
Total pages 7
Publisher IAEME Publication
Place of publication Chennai, India
Publication date 2018-09-11
ISSN 0976-6308
Keyword(s) flexible pavement
unbound granular materials
repeated load triaxial test
permanent deformation
constitutive models
moisture content
Summary The performance of unbound granular materials is generally assessed by their strength, modulus, and resistance to breakage. The mechanical properties of the unbound granular materials are not considered in most of the specifications of the local pavement base materials such as Vic Roads. Moreover, there is a little information about the effect of the local unbound granular materials properties on the permanent deformation due to the complexity of the materials (i.e. nonlinear) and difficulties to conduct long term laboratory permanent deformation test. Thus, this study aims to test the effect of the moisture content on the permanent deformation of the local base materials under repeated loads. Three different samples prepared over three different moisture contents were tested in the laboratory using a repeated load triaxial test. The results showed that as soon as the moisture content increases the permanent deformation of unbound granular materials also increases. When the moisture content was above the optimum (+OMC), a dramatic collapse is noticed in the permanent deformation resistance of B1, B2 and G1 respectively. Whilst, a high resistance to permanent deformation was noticed when samples prepared at a moisture content below the optimum (-OMC). The regression analysis showed that when the moisture content was below the optimum, low values for parameter c and B, and high values for parameter S are observed, except for sample G1. It was also concluded that the investigated regression model is material dependent due to the high-observed quality of fit for sample G1.
Language eng
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2018, IAEME Publication
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