Compositions: coating or plastic – Coating or plastic compositions – Inorganic settable ingredient containing
Patent
1988-06-07
1990-09-11
Bell, Mark L.
Compositions: coating or plastic
Coating or plastic compositions
Inorganic settable ingredient containing
106696, 106708, 106719, 106DIG2, 106790, 524 5, C04B 702, C04B 1418, C04B 1420, C04B 2400
Patent
active
049560131
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to refractory coating tstanding in fire resistance and to compositions ou refractory coating methods.
Prior Art and Problems
Refractory coating compositions useful in constructing buildings of steel frame structure, plants or the like are required to have specific fire resistance. For example, the Ministry of Construction set a standard of fire resistance required in refractory structures. A method for fire resistance test is specifically defined in "Specified method for fire-resistant structures" in Notification No. 2999 (May 31, 1969) of Ministry of Construction. The testing conditions shown in the notification include, for example, the requirements for steel columns to be tested that the coated steel columns shall be heated in a furnace at about 1000.degree. C. for predetermined time, e.g., 1 hour in a 1-hour fire resistance test. and that the temperature of the steel frame shall not exceed 350.degree. C. on the average. A variety of refractory coating compositions including those for spraying and those to be made into boards have been heretofore accredited as meeting the requirements.
From the standpoint of architectural design, there is a demand for refractory coating materials giving more lightweight, thinner coats on steel frames. More specifically, the decrease in the weight of coating material per unit area of coating mitigates the weight load to be supported by a steel structural member of a building and thus may lead to use of smaller-size steel structural members if the conditions otherwise permit. Particularly this effect is larger with an increase in the height of a high-rise building. On the other hand, if a refractory coating material can be applied thinner, the coating operation can be completed in a shorter period of time because of reduced coat thickness. The application of thinner coating provides further great advantages of decreasing the volume of coating material used, reducing the space for storage and lessening the transportation amount. Moreover, a thinner coating gives another advantage in terms of use in that the effective volume of defined space which can be utilized is increased as a function of the reduction of coat thickness.
The refractory coating methods are roughly classified into two methods. One of them is called a dry method which comprises adhering to a steel frame, boards of calcium silicate, gypsum boards, asbestos cement slates or the like. The other method is a wet method which comprises coating a steel frame with a mixture of coating material and water by spraying, troweling or concreteplacing or other means on a building site.
The dry method is to stick dried boards to a steel frame on a building site, eliminating the need for an in-situ drying procedure, unlike the wet method involving the use of water, and thus the builder can advantageously proceed to subsequent operation on completion of the procedure. With a smooth surface, dry boards can provide a surface to be decorated. However, the dry method has the drawbacks of involving cumbersome labors such as cutting the dry board in conformity with various shapes of substrate, fixing a joint between the boards in a complicated connection which tend to form gaps, and repairing the damaged portions of boards which are generally prone to break and crack. Moreover, the dry method is time-consuming in lifting boards to a higher position on a building site in contrast to the wet method which is capable of pumping up the coating material relatively easily to higher locations.
For covering steel beams or columns of relatively intricate shape, the wet method, particularly spraying method, is employed because of ease of operation instead of the dry method with the above-noted drawbacks.
Given below are known refractory coating materials to be chiefly used in the wet refractory coating method.
(1) Mortar concrete type
A formwork is set around a steel member and then concrete, lightweight concrete, cellular concrete or the like, is placed into a space between the formwork and th
REFERENCES:
patent: 4174230 (1979-11-01), Hashimoto et al.
patent: 4544409 (1985-10-01), Daussan et al.
Bell Mark L.
Green Anthony J.
Shikoku Kaken Kogyo Co., Ltd.
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