Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Composite having voids in a component
Patent
1986-10-31
1988-02-02
Van Balen, William J.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Composite having voids in a component
427215, 427220, 428403, 428703, B05D 700, B32B 326
Patent
active
047228610
ABSTRACT:
A lightweight aggregate which is inexpensive and excellent in both resistance to freezing and thawing and resistance to water absorption and a process for preparation of such lightweight aggregate are disclosed. In this lightweight aggregate, a gel material is filled in at least open pores in the surface layer of a lightweight porous aggregate among a multiplicity of open pores therein. The preparation process includes the steps of injecting a raw material solution for gel formation in at least open pores in the surface layer of a lightweight porous aggregate among a multiplicity of open pores therein, and allowing the material solution to gel, thereby forming a gel material in at least the open pores in said surface layer so as to fill them with the gel material. Also disclosed is another preparation process which includes the steps of submerging a heated lightweight porous aggregate in a raw material solution for gel formation so as to fill the raw material solution in at least open pores in the surface layer of the aggregate among a multiplicity of open pores therein through suction by the reduced pressure effect caused by cooling of the aggregate, and converting the material solution filled in the open pores to a gel, thereby forming a gel material in said open pores so as to fill them with the gel material.
REFERENCES:
patent: 2639269 (1953-05-01), Dube
patent: 2650171 (1953-08-01), Schaaf
patent: 3769065 (1973-10-01), Dunn
patent: 4039297 (1977-08-01), Takenaka
patent: 4172744 (1979-10-01), Ishikawa
patent: 4268558 (1981-05-01), Boardman
patent: 4504402 (1985-03-01), Chen et al.
Shimizu Construction Co. Ltd.
Van Balen William J.
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