Apparatus for measuring deflection or deformation in pavement st

Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Earth stresses

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G01N 300

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active

050463667

ABSTRACT:
A system 10 for measuring deflection and/or deformation of a layer in a pavement structure under load is disclosed and claimed. The system comprises at least one apparatus 11 including electric coils 17 sensitive to relative movement between them and a separately anchored body 18 of ferromagnetic material. The apparatus 11 comprises two longitudinally spaced relatively moveable discs 19, 22 and a body 21 of a resilient, transversely expandable material between the discs. A nut 25 serves to urge the discs 19, 22 towards one another thereby causing the body 21 transversely to expand to secure the apparatus at a predetermined depth against a wall in a test hole.

REFERENCES:
patent: 3380167 (1968-04-01), Abel, Jr. et al.
patent: 3419080 (1968-12-01), Lebourg
patent: 3538608 (1970-11-01), Bronson
patent: 3562916 (1971-02-01), Duckworth
patent: 4649741 (1987-03-01), Strom
patent: 4719803 (1988-01-01), Capelle et al.
National Institute for Transport and Road Research etc.; "The Multi-Depth Deflectometer: A Multistage Sensor, etc." Basson et al., Feb. 1981.
"The Multi-Depth Deflector, etc.", by Morris de Beer et al. Paper accepted for the first International Symposium on nondestructive testing, etc.
"Effective Moduli and Stress Dependence of Payment Materials as Measured in Some Heavy-Vehicle Simulator Tests" by J. H. Maree et al.
"Field Evaluation of the Multi-Depth Deflectometers"--Search Report 1123-2 by T. Scullion et al., Report date Sep. 1988.
"Use of Multidepth Deflector for Deflection Measurements" by Tom Scullion and A. J. Bush.
"Using the Multidepth Deflectomer to Verify Modulus Backcalculation Procedures" by Tom Scullion et al.

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