Road structure – process – or apparatus – Pavement – Including bed
Patent
1984-05-23
1986-06-10
Novosad, Stephen J.
Road structure, process, or apparatus
Pavement
Including bed
404 31, 404 77, 404 79, 404 82, E01C 300, E01C 706
Patent
active
045940223
ABSTRACT:
A microwave energy reflecting zone (12, 12a, 12b) is provided below the surface of a pavement (11, 11', 11a, 11b) at a depth that is less than the maximum depth that such energy can penetrate into paving materials. The reflective zone, which is formed of electrically conductive material (16, 16a to 16h), results in energy and cost savings in subsequent paving or pavement repair operations that involve microwave heating of thermoplastic pavement and in which it is not necessary to heat down to the full depth to which such energy can penetrate paving materials. The heating is concentrated or localized within a predetermined upper portion of the pavement. The energy concentrating pavement may, for example, be more economically resurfaced when that becomes necessary by microwave heating followed by remixing and recompaction of the heated upper portion of the pavement material. The microwave reflective zone may be arranged to transmit a limited portion of downwardly propagating microwave energy to assure good bonding of the heated overlayer to the underlayer of paving material. Different microwave heating patterns, ranging from a highly uniform heating to heating which increases with depth, may be arranged for by locating the reflective zone at different depths.
REFERENCES:
patent: 2347233 (1944-04-01), Abernathy
patent: 2408251 (1946-09-01), Dantz
patent: 3603221 (1971-09-01), Barton
patent: 4175885 (1979-11-01), Jeppson
patent: 4252459 (1981-02-01), Jeppson
patent: 4252487 (1981-02-01), Jeppson
patent: 4319856 (1982-03-01), Jeppson
(Author not identified), "Late Night Operation Replaces Deck . . . ", _California Builder & Engineer, Nov. 29, 1982, pp. 28, 30.
Advertisement of Phillips Fibers Corporation, Rural and Urban Roads, Sep. 1977, for "PETROMAT", p. 57.
Advertisement of Greulick, Inc., Rural and Urban Roads, Aug. 1978, p. 21, headed "A New Deck in Seven Weeks . . . ".
Letchford John F.
MP Materials Corporation
Novosad Stephen J.
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