Compaction and pavement design testing machine and method for testing flexible pavement materials

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 5911164
SERIAL NO

09021373

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A combination kneader/compactor and plane-strain, simple shear testing apparatus for use in testing paving materials by subjecting them to anticipated design stress over a range of temperatures and various rates of shear. The sample is compacted to the ultimate in-place (equilibrium) density that occurs in the pavement structures. This apparatus and method pre-stresses the sample under the actual stress anticipated for the structure and use the anticipated theoretical vertical stress to fully compact the sample followed by a plane strain simple shear test to measure the dimensionally correct shear strength and moduli which are used to calculate the dimensionally correct design parameters. Pertinent variables are displayed on a computer screen during testing followed by print out of a graph and data sheets with relevant design data. Fundamental engineering (stress-strain) measurements including rational shear strength and static as wall as dynamic moduli are obtained which are suitable for use in design calculations in a rational engineering approach to flexible pavement design in lieu of conventional empirical correlations. The optimum bitumen or water content is precisely determined on the basis of the elasto-plastic property response under simulated traffic, independently of conventional empirical correlations with a percentage of voids and empirical shear indices. Precisely controlled cyclic shear deformation is introduced while the sample is subjected to the anticipated design vertical stress, this being analogous to what happens in the pavement beneath a moving vehicle tire. Thus this laboratory testing machine becomes an accelerated traffic simulator.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
McRae, John L 416 Groome Dr., Vicksburg, MS 39180 3 58

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Other [Check patent profile for assignment information] (2)
* 4942768 Paving material testing machine 17 1989
* 5036709 Paving materials testing machine 30 1990
 
IOWA STATE UNIVERSITY RESEARCH FOUNDATION, INC. (1)
* 4502338 Triaxial apparatus for testing particulate material and method of using the same 19 1983
 
Pine Instrument Company (1)
* 5456118 Gyratory compactor 27 1994
 
ARMSTRONG WORLD INDUSTRIES, INC. (1)
* 4569222 Rolling caster floor tester 7 1984
 
TROXLER ELECTRONIC LABORATORIES, INC. (1)
* 5323655 Method and apparatus for compacting material samples 24 1993
 
Rainhart Company (1)
* 5275056 Gyratory shear material compacting device 18 1992
 
TA INSTRUMENTS-WATERS L.L.C. (1)
* 5712431 Device and method for testing the shear response of a material in response to an applied force 25 1996
* Cited By Examiner

Patent Citation Ranking

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Other [Check patent profile for assignment information] (2)
* 6729189 Method and apparatus for measuring packing properties 7 2002
* 8438914 Apparatus for measuring the unconfined yield strength and time unconfined yield strength of bulk granular material 0 2010
 
BROUSE, GREGORY (1)
* 6526836 Bituminous pavement fatigue testing device 5 2000
 
Pine Instrument Company (6)
* 6889558 Real-time display of internal gyration angle in gyratory compaction material testing 8 2002
* 2003/0075,820 Real-time display of internal gyration angle in gyratory compaction material testing 1 2002
6904693 Method and device for defining elastic deformations and internal angle of a gyratory compactor 2 2003
* 2004/0181,956 Method and device for defining elastic deformations and interal angle of a gyratory compactor 0 2003
6925889 Devices and methods for applying known resistance loads and measuring internal angles of gyration in gyratory compactors 8 2003
* 2004/0123,685 Devices and methods for applying known resistance loads and measuring internal angles of gyration in gyratory compactors 0 2003
 
TOHOKU TECHNO ARCH CO., LTD. (1)
* 6694815 Liquefaction phenomenon prediction system 1 2003
 
FORD GLOBAL TECHNOLOGIES, LLC (4)
* 7197920 Test apparatus for accelerated wheel and suspension component structural durability 2 2005
* 2006/0218,999 TEST APPARATUS FOR ACCELERATED WHEEL AND SUSPENSION COMPONENT STRUCTURAL DURABILITY 1 2005
7530264 Test apparatus for accelerated wheel and suspension component structural durability 0 2007
* 2007/0261,469 TEST APPARATUS FOR ACCELERATED WHEEL AND SUSPENSION COMPONENT STRUCTURAL DURABILITY 1 2007
 
WISCONSIN ALUMNI RESEARCH FOUNDATION (2)
6694823 Apparatus and method for testing material performance 3 2001
7047820 Apparatus and method for testing material performance 0 2003
 
Mercury Scientific Inc (1)
* 2012/0118,072 APPARATUS FOR MEASURING THE UNCONFINED YIELD STRENGTH AND TIME UNCONFINED YIELD STRENGTH OF BULK GRANULAR MATERIAL 1 2010
* Cited By Examiner