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Volume :29 Issue : 1 2002      Add To Cart                                                                    Download

Modeling Marshall test results for optimum asphalt-concrete mix design

Auther : AHMAD H. ALJASSAR* , MOHAMMED AHMED ALI AND AREF ALZAABI

 Department of Civil Engineering, Kuwait University, P.O Box 5969, Safat 13060, Kuwait.
*e-mail: aljassar@civil.kuniv.edu.kw

ABSTRACT

This paper presents the results of a research investigation that was conducted using standard Marshall test results of asphalt-concrete (AC) mixes. The Marshall Mix design is the standard procedure used in Kuwait to design AC paving mixes. All of the tested mixes were prepared for pavement construction in Kuwait. Two hundred and forty - four actual Marshall test results (from the Ministry of Public Works) were compiled and processed to build a model relating the optimum asphalt cement (binder) content to the particle size- gradation of the aggregate blend in an AC mix. The idea is based on the fact that the function of binder in an AC mix is to coat the surfaces of the aggregate particles and fill the voids between them. Both the specific surface area (surface area per unit weight of the aggregate blend) and the voids between aggregate particles are dependent upon the particle size-gradation of the aggregate blend. Multivariate regression models were developed relating the optimum binder content from the Marshall procedure of mix design and the particle size- gradation of the aggregate blend in an AC mix. This paper reviews the Marshall method of mix design and types of AC mixes used in Kuwait. Then it discusses the effect of aggregate size gradation on optimum binder content. The paper presents the results of developing regression models relating the aggregate gradation to the optimum binder content.

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