Density of asphalt paving mixtures: Measurements, variations, and influencing factors
The first part describes the results of a research study to determine the effectiveness of the Troxler Model 4640 Thin Lift Nuclear Density Gauge. The densities obtained from cores and the nuclear density gauge from seven construction projects were compared. A linear regression technique was used to investigate how well the core densities could be predicted from nuclear densities. Correlation coefficients were determined to indicate the degree of correlation between the core and nuclear densities. Using a statistical analysis technique, the range of differences between core and nuclear measurements was established for specified confidence levels for each project. Analysis of the data indicated that the accuracy of this gauge is highly material dependent. While acceptable results were obtained with limestone mixtures, the gauge did not perform satisfactorily with mixtures containing siliceous aggregate. The data presented in this paper indicate that the gauge could be used as a quality control tool provided that a calibration is developed for each project. The maximum theoretical specific gravities of asphalt-aggregate paving mixtures obtained from different methods were compared. The study included experimental work and analysis of the resulting data. The agreement between results obtained from the Texas C-14 method and the Rice method were excellent. Results obtained by backcalculating theoretical maximum densities from a single Rice test were also found to be satisfactory. Theoretical approach based on bulk specific gravity of aggregate is not recommended because of yielding significantly low theoretical maximum specific gravities and high relative densities. The last two parts summarize density levels and corresponding variations obtained from fifty-seven construction projects throughout the state of Texas.
- Research Organization:
- Texas Univ., Austin, TX (United States)
- OSTI ID:
- 6100183
- Resource Relation:
- Other Information: Thesis (Ph.D)
- Country of Publication:
- United States
- Language:
- English
Similar Records
Nuclear method for determination of asphalt content corrected for moisture in bituminous mixture. Final report, March 1988-February 1989
Nuclear asphalt content gauge study. Research report (Final)
Related Subjects
ASPHALTS
BULK DENSITY
DENSIMETERS
PERFORMANCE
PAVEMENTS
ACCURACY
CALIBRATION
CARBON 14
COMPARATIVE EVALUATIONS
CONSTRUCTION
DATA ANALYSIS
GRANULAR MATERIALS
LIMESTONE
QUALITY CONTROL
QUANTITY RATIO
REGRESSION ANALYSIS
ROADS
SILICATE MINERALS
TEXAS
VARIATIONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BITUMENS
CARBON ISOTOPES
CARBONATE ROCKS
CONTROL
DENSITY
DEVELOPED COUNTRIES
EVALUATION
EVEN-EVEN NUCLEI
FEDERAL REGION VI
ISOTOPES
LIGHT NUCLEI
MATERIALS
MATHEMATICS
MEASURING INSTRUMENTS
MINERALS
NORTH AMERICA
NUCLEI
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
RADIOISOTOPES
ROCKS
SEDIMENTARY ROCKS
STATISTICS
TAR
USA
YEARS LIVING RADIOISOTOPES
440101* - Radiation Instrumentation- General Detectors or Monitors & Radiometric Instruments