Plastic and nonmetallic article shaping or treating: processes – With printing or coating of workpiece – Applied to clay – sand – or earthen workpiece
Patent
1988-07-11
1990-06-26
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
With printing or coating of workpiece
Applied to clay, sand, or earthen workpiece
264132, 264139, 264246, 264256, B29C 3912, B32B 3100, C04B 4100, C04B 4145
Patent
active
049370278
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of manufacturing concrete or mortar having a corrosion-resistant film layer formed on its surface and, more particularly, to a method of manufacturing concrete or mortar, in which a corrosion-resistant film layer is formed on the surface of concrete or mortar simultaneously with demolding of the concrete or mortar.
BACKGROUND ART
Cement, concrete or mortar is widely used as an inexpensive construction material. However, these materials are damaged by an acid, salt, seawater, and an oil or under chemical environments such as carbonic acid gas and sulfurous acid gas. In order to compensate for this drawback, the surface of concrete is conventionally coated with a corrosive-resistant paint. This is called "coating" when a thin film having a thickness of 0.2 to 0.3 mm is formed and is called "lining" when a thick film having a thickness of 1 mm or more is formed. However, this distinction is not always clear.
Asphalt, tar, or a thermosetting resin paint is normally used in coating. In corrosion-resistant coating of a concrete structure, it is most important to cover the surface of concrete so that no pin-holes are left thereon. However, in practice, it is not easy to coat the surface of hardened concrete in such manner. That is, since a large number of large and small holes are present on the concrete surface, it is very difficult to coat the surface so that all the holes including pin-holes are completely covered. For this reason, in conventional techniques, the number of coating layers is increased or a primer treatment is performed to solve the above problem. However, these techniques require much labor. For example, in "Guides (Draft) for Salt Damage of Road Bridge and its Explanation" (Incorporated Body (Shadan Hojin) of Japan Road Association, issued on February, 1984), concrete painting systems for preventing salt damage are classified in three types of A, B, and C in accordance with using conditions of a structural member. In any of these painting systems, four steps of a primer treatment (first treatment) using an epoxy resin primer or a polyurethane resin primer, a putty treatment (second treatment) using an epoxy resin putty or a vinyl ester resin putty, intercoating (third treatment) using an epoxy resin paint, a polyurethane resin paint, or a vinyl ester resin paint, and over-coating (fourth treatment) using a polyurethane resin are required. In addition, it is standardized that an interval of one to ten days be provided between the steps. In order to improve adhesive properties between the film and the concrete to sufficiently achieve a corrosive preventing effect, materials which adversely affect painting such as a laitance, a mold releasing agent, attached salt, attached oil, and moisture must be removed. As a base treatment for this purpose, the surface is sanded, wiped with a thinner, cleaned by a brush, or dried by air blow.
However, these treatments are very troublesome and costly. In addition, a film formed even upon these treatments is easily peeled. Other examples of corrosion-resistant concrete are polymer-impregnated concrete and resin concrete. However, these examples are costly and hence are not suitable for use in general purposes.
According to the present invention, the inner surface of a formwork is coated beforehand to form the corrosion-resistant film thereon, and concrete or mortar is molded using this formwork. Then, a corrosion-resistant film layer is transferred onto the surface of the concrete or mortar at the same time the concrete or mortar is removed from the formwork. As a result, concrete or mortar having a good acid resistance can be easily obtained.
DISCLOSURE OF INVENTION
The first invention of the present application is characterized in that a peelable film is formed on the inner surface of a formwork, and one or two paints selected from the group consists of an asphalt paint, a tar paint, and a thermosetting resin paint, or resin mortar using a thermosetting resin as a binder is coated on the film to
REFERENCES:
patent: 1729172 (1929-09-01), Lundin
patent: 2070596 (1937-02-01), Hansen
patent: 3439076 (1969-04-01), Loois
patent: 3619457 (1971-11-01), Chandler et al.
patent: 3905929 (1975-09-01), Noll
patent: 3929706 (1975-12-01), Schmidt et al.
patent: 3941864 (1976-03-01), Bosch et al.
patent: 3955906 (1976-05-01), Murase et al.
patent: 4036839 (1977-07-01), Plunguia et al.
patent: 4049874 (1977-09-01), Aoyama et al.
patent: 4060581 (1977-11-01), Darby et al.
patent: 4088808 (1978-05-01), Cornwell et al.
patent: 4115316 (1978-09-01), Burke, Jr.
patent: 4177232 (1979-12-01), Day
patent: 4213926 (1980-07-01), Toyoda et al.
patent: 4350739 (1982-09-01), Mohiuddin
patent: 4356230 (1982-10-01), Emanuel et al.
patent: 4428994 (1984-01-01), Rawlins
patent: 4435472 (1984-03-01), Leah
patent: 4476657 (1984-10-01), Juba et al.
patent: 4507365 (1985-03-01), Lower et al.
patent: 4536417 (1985-08-01), Shimizu
patent: 4634626 (1987-01-01), Yamaguchi et al.
Treatise on Coatings, vol. 4 (in two parts) Formulations Part I (edited by Raymond R. Myers and J. S. Long).
Treatise on Coatings, vol. 1 (Part II) Film-Forming Compositions (edited by Raymond R. Myers and J. S. Long).
UCAR Solution Vinyl Resins for Coatings-Union Carbide Chemical Abstracts vol. 64, 1966-48-Plastics Technology p. 6834 "Mechanics of Peeling".
Mechanics of Peeling. II. Time-Temperature Superposition Principle in the Breaking of Adhesion. Toshio Hata et al. Kobunshi Kagaku 22(239)160-5(1965).
Strippable Coatings, Y. M. Chandhok and S. N. Agarwal, Paint Manufacture, Jul. 1970.
Protective Coatings for Metals (3rd Ed.), R. M. Burns and W. W. Bradley Reinhold Publishing Corp.
Guide to United States Government Paint Specifications 15th Ed. Nat'l. Paint, Varnish & Lacquer Assoc., Inc., Jun. 1958.
Jimbo Kazumi
Oshio Akira
Shirokuni Shoji
Kutach Karen D.
Onoda Cement Co. Ltd.
Silbaugh Jan H.
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