00621480

Component

http://onlinepubs.trb.org...trr/1991/1317/1317-013.pdf

https://scholar.google.co...aaly&publication_year=1991

A new technique was developed to measure the moisture content in hot-mix asphalt concrete. The technique involves measuring the dielectric properties of the hot-mix asphalt concrete using electromagnetic waves in the microwave range of 12.4 to 18.0 GHz. Using the dielectric property measurements, the moisture content can be calculated. This study used piedmont gravel and limestone aggregates in dense-graded and open-graded cases. One type of asphalt cement was studied exclusively because three types of asphalt were found to have almost the same dielectric properties. Asphalt content, surface smoothness, and specimen thickness were also found to have no effect on the measured dielectric properties. The study considered the different void ratios that had noticeable effects on the microwave reflection measurements. However, the presence of water in the mixes overshadowed the effects of all other factors on the dielectric properties of the mix. Regression models were developed to predict the volumetric moisture content. The study suggested a model that was found to be a function of the dielectric properties of dry and wet hot-mix asphalt concrete. Therefore, in practice, several cores are essential to obtain the in situ dry dielectric properties of hot-mix asphalt concrete.

This paper appears in Transportation Research Record No. 1317, Asphalt Mixtures: Design, Testing, and Evaluation 1991. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01407169

p. 122-127

1991

Transportation Research Record

030905155X

Figures (8) ; References (12)

Asphalt concrete; Dense graded aggregates; Dielectric materials; Forecasting; Gravel; Hot mix asphalt; Limestone aggregates; Microwaves; Mixtures; Moisture content; Nondestructive tests; Open graded aggregates; Regression analysis

Dense graded mixes

Data and Information Technology; Highways; Materials; I31: Bituminous Binders and Materials

TRIS, TRB, ATRI

Apr 30 1992 12:00AM

• ANALYSIS OF CRACK PROPAGATION IN ASPHALT CONCRETE USING COHESIVE CRACK MODEL
• DEVELOPMENT OF A PRACTICAL METHOD FOR DESIGN OF HOT-MIX ASPHALT
• EFFECT OF AGGREGATE GRADATION VARIATION ON ASPHALT CONCRETE MIX PROPERTIES
• EFFECT OF LOADING MAGNITUDE ON MEASURED RESILIENT MODULUS OF ASPHALTIC CONCRETE MIXES
• EFFECT OF TEMPERATURE AND MIXTURE VARIABLES ON FATIGUE LIFE PREDICTED BY DIAMETRAL FATIGUE TESTING
• EFFECT OF THE USE OF MODIFIERS ON PERFORMANCE OF ASPHALTIC PAVEMENTS
• EFFECTS OF SAMPLE PREPARATION AND AIR-VOID MEASUREMENT ON ASPHALT CONCRETE PROPERTIES
• EVALUATION OF MARSHALL AND HVEEM MIX DESIGN PROCEDURES FOR LOCAL USE
• EVALUATION OF MIX PROPERTIES OF COLD IN-PLACE RECYCLED MIXES
• EVALUATION OF RESIN-MODIFIED PAVING PROCESS
• INVESTIGATION OF RUTTING POTENTIAL USING STATIC CREEP TESTING ON POLYMER-MODIFIED ASPHALT CONCRETE MIXTURES
• MATERIAL CHARACTERIZATION AND INHERENT VARIATION ANALYSIS OF ASPHALTIC FIELD CORES
• METHODS TO DETERMINE POLYMER CONTENT OF MODIFIED ASPHALT
• PERFORMANCE ASSESSMENT OF BINDER-RICH POLYETHYLENE-MODIFIED ASPHALT CONCRETE MIXTURES (NOVOPHALT)