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Volume :30 Issue : 2 2003      Add To Cart                                                                    Download

Using Marshall test to assess asphalt-concrete modulus for mixes used in Kuwait

Auther : AHMAD H. AL JASSAR*, ABDULAZIZ M. AL-SHEHAB**, AREF AL-ZAABI***

*Civil Eng. Dept., Kuwait University, P.O Box 5969, Safat13060, Kuwait, Fax: 4817524

**Experts Department, Ministry of Justice, P.O Box 23937, Safat 13100, Kuwait

ABSTRACT

The structural (thickness) design of asphalt pavement layers is a function of many factors, one of the most important of which is the stiffness of the asphalt mix. In Kuwait, the structural design of pavements is performed using assumed values for stiffness that may not represent the actual stiffness of the used material. Stiffness modulus testing is time and effort consuming and requires skilled labour and special equipment. Therefore, it is not performed on a routine basis to check the stiffness of the asphalt-concrete mixes in Kuwait. This study was performed to establish a relationship between the stiffness (represented by the resilient modulus) and the Marshall test parameters obtained from the Marshall mix design procedure which is the standard used in Kuwait to design asphalt-concrete paving mixes. The Marshall parameters considered in this study are stability/flow ration and the Marshall Index, which represents the slope of the straight portion of the load-deformation curve obtained during Marshall testing.

Regression analysis demonstrated good correlation between stiffness and stability/ flow ratio at 60°C at various loading frequencies. The resulting model showed a linear relationship between the two parameters that are independent of the mix type.

Keywords: Asphalt concrete; Kuwait; Marshall test; MATTA; stiffness modulus.

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