01044227

Component

https://doi.org/10.3141/2001-13

http://scholar.google.com...iams&publication_year=2007

The measurement of specific gravity for hot-mix asphalt (HMA) is critical to almost every activity pertaining to asphalt mixtures. During design and construction, the bulk specific gravity (Gmb) of HMA mixes is used to calculate many properties that indicate pavement quality. Thus, it is important to measure this property accurately and precisely. This study evaluated four methods for measuring Gmb, including the traditional saturated surface dry (SSD) method, the CoreLok method, the height– diameter method, and the CoreReader method. Four aggregate sources were used to create mix designs for 25.0-mm and 37.5-mm nominal maximum aggregate sizes (NMASs). In addition, the level of compactive effort was varied to assess the comparisons for a range of air voids. Results indicate that the traditional method exhibited the lowest levels of variability. Strong correlations were developed to relate the test methods on the basis of the large NMASs. The strongest and most practical relationship was developed between the SSD and CoreLok methods. These models can be used to assess the effects of incorporating new test methods for both design and construction procedures. They can also be used to normalize data from different test methods, should alternative methods be desired. Although some recommend the use of an alternative test method (such as CoreLok), the studies on which these recommendations are based did not include large NMAS mixes (25.0 mm and 37.5 mm). Although alternative methods do possess significant advantages, the results of this study do not support the elimination of the traditional Gmb test method.

01082338

English

pp 110-117

2007

Transportation Research Record: Journal of the Transportation Research Board

9780309104272

Print

Figures (2) ; References (7) ; Tables (4)

Asphalt mixtures; Hot mix asphalt; Specific gravity; Superpave

Coarse graded mixes; Corelok device; Nominal maximum aggregate size; Saturated surface dry method

Highways; Materials; I31: Bituminous Binders and Materials

PRP, TRIS, TRB, ATRI

Feb 8 2007 6:42PM

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• Evaluating Georgia’s Compaction Requirements for Stone Matrix Asphalt Mixtures
• Hot-Mix Asphalt Mixtures for Nevada's Intersections
• Long-Term Performance of Superpave in Specific Pavement Study 9A
• Moisture Susceptibility of Asphalt Mixtures with Known Field Performance: Evaluated with Dynamic Analysis and Crack Growth Model
• New Predictive Models for Viscosity and Complex Shear Modulus of Asphalt Binders: For Use with Mechanistic–Empirical Pavement Design Guide
• Optimum Number of Superpave Gyrations Based on Project Requirements
• Overlay Tester: A Simple Performance Test for Fatigue Cracking
• Predicting the Resilient Modulus of Asphalt Concrete from the Dynamic Modulus
• Prediction of Fatigue Cracking in Asphalt Pavements: Do We Follow the Right Approach?
• Quantification of Effect of Polymer-Modified Asphalt on Flexible Pavement Performance
• Rational Modeling of Tertiary Flow for Asphalt Mixtures
• Sample Size Requirements for Field Permeability Measurements of Hot-Mix Asphalt Pavements
• Spanish Experience with Gyratory Compactor and Indirect Tensile Test in Design and Control of Cold Recycled Asphalt Pavement
• Surface Free Energy to Identify Moisture Sensitivity of Materials for Asphalt Mixes