National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

Details

Ruggedness Testing of the Dynamic Shear Rheometer and the Bending Beam Rheometer Test Procedures.

PB96165162

Publication Date	1995
Personal Author	Shashidhar, N.; Chollar, B. H.
Page Count	78
Abstract	Ruggedness testing of the bending beam rheometer (BBR) and the dynamic shear rheometer (DSR) was performed. Four laboratories participated in this effort. Three materials were used for BBR ruggedness testing and four materials were used for DSR ruggedness testing. Measurement of the creep stiffness and m-value at 60 s with the BBR was found to be fairly repeatable. Of the factors studied, the mold used for casting the beams had a significant effect. Different beam thickenss by the two molding techniques was found to be a factor that caused this variation. Other unknown factor(s) also seemed to contribute to this effect. The test temperature also had a significant effect and should be controlled to plus or minus 1 degree C. Ruggedness testing is a screening test for 'detecting and reducing sources of variation in a test method early in its development and prior to an inter-laboratory study' for precision and bias. It is the goal of this screening process to reduce the variability of test results to a minimum through the detection and control of pertinent variables.
Keywords	Test methods Rheometers Bituminous concretes Asphalt pavements Binders Creep Viscosity Quality control Aging(Materials) Highway maintenance Laboratory tests Standards Road materials Bonding beams Casting Tensions
Source Agency	Federal Highway Administration
NTIS Subject Category	50C - Construction Equipment, Materials, & Supplies 50A - Highway Engineering 71L - Materials Degradation & Fouling
Corporate Authors	Federal Highway Administration, McLean, VA. Office of Engineering and Highway Operations Research and Development.
Document Type	Technical Report
Title Note	Final rept. Sep 92-Dec 94.
NTIS Issue Number	199613

Ruggedness Testing of the Dynamic Shear Rheometer and the Bending Beam Rheometer Test Procedures.

Ruggedness Testing of the Dynamic Shear Rheometer and the Bending Beam Rheometer Test Procedures.
PB96165162

Publication Date	1995
Personal Author	Shashidhar, N.; Chollar, B. H.
Page Count	78
Abstract	Ruggedness testing of the bending beam rheometer (BBR) and the dynamic shear rheometer (DSR) was performed. Four laboratories participated in this effort. Three materials were used for BBR ruggedness testing and four materials were used for DSR ruggedness testing. Measurement of the creep stiffness and m-value at 60 s with the BBR was found to be fairly repeatable. Of the factors studied, the mold used for casting the beams had a significant effect. Different beam thickenss by the two molding techniques was found to be a factor that caused this variation. Other unknown factor(s) also seemed to contribute to this effect. The test temperature also had a significant effect and should be controlled to plus or minus 1 degree C. Ruggedness testing is a screening test for 'detecting and reducing sources of variation in a test method early in its development and prior to an inter-laboratory study' for precision and bias. It is the goal of this screening process to reduce the variability of test results to a minimum through the detection and control of pertinent variables.
Keywords	Test methods Rheometers Bituminous concretes Asphalt pavements Binders Creep Viscosity Quality control Aging(Materials) Highway maintenance Laboratory tests Standards Road materials Bonding beams Casting Tensions
Source Agency	Federal Highway Administration
NTIS Subject Category	50C - Construction Equipment, Materials, & Supplies 50A - Highway Engineering 71L - Materials Degradation & Fouling
Corporate Authors	Federal Highway Administration, McLean, VA. Office of Engineering and Highway Operations Research and Development.
Document Type	Technical Report
Title Note	Final rept. Sep 92-Dec 94.
NTIS Issue Number	199613