4 research outputs found

    COMPREHENSIVE LABORATORY PERFORMANCE EVALUATION OF WMA WITH LEADCAP ADDITIVES

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    ABSTRACT This paper presents the laboratory test and analysis results from a reference hot-mix asphalt (HMA) mixture and warm mix asphalt (WMA) mixtures modified by two different LEADCAP additives (KW3 and KW6) of a wax type. The performance characteristics investigated in this study include rutting, fatigue cracking, and moisture susceptibility. Rutting performance is evaluated by the triaxial repeated load permanent deformation (TRLPD) test and the asphalt pavement analyzer (APA) test. Fatigue performance of the mixtures with and without moisture conditioning is evaluated using the direct tension cyclic test following the simplified viscoelastic continuum damage (S-VECD) protocol. The resulting damage characteristics and dynamic modulus are used in the layered viscoelastic analysis program to assess the fatigue performance and the moisture susceptibility of these mixtures in pavement structures with different asphalt layer thicknesses. Both the TRLPD and APA test results show that the KW3 and KW6 mixtures exhibit more resistance to rutting than the HMA mixture. In particular, the rutting resistance of the KW3 mixture is superior to that of the HMA and KW6 mixtures. In addition, the HMA and KW6 mixtures exhibit approximately the same favorable characteristics of fatigue resistance, whereas the KW3 mixture's fatigue performance is worse than that of the HMA and KW6 mixtures. However, the moisture susceptibility results indicate that the KW6 mixture is more susceptible to moisture damage than the HMA mixture in terms of fatigue resistance. This increased moisture susceptibility in the KW6 mixture is currently being addressed by modifying the KW6 additive. This study demonstrates the importance of the comprehensive performance testing of mixtures for the development and optimal design of a WMA additive

    Recent Advances in the Liquid-Phase Syntheses of Inorganic Nanoparticles

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    Chemistry and Properties of Nanocrystals of Different Shapes

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