The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 02, 1988
Filed:
Oct. 31, 1986
Minoru Sawaide, Tokyo, JP;
Shimizu Construction Co., Ltd., Tokyo, JP;
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.