Compositions: coating or plastic – Coating or plastic compositions – Inorganic settable ingredient containing
Patent
1995-12-08
2000-02-15
Marcantoni, Paul
Compositions: coating or plastic
Coating or plastic compositions
Inorganic settable ingredient containing
106737, 106740, 264333, 264DIG43, C04B 714
Patent
active
060247916
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a molded body of a cement type formed from an admixed and kneaded material having excellent bending strength and compression strength and a method of manufacturing the same. The molded body of this invention has excellent characterization values in the bending strength and compression strength, to provide a cement type molded body having a relatively thin thickness and small weight, and the molded body being suitable for constructing various structures. Therefore, the object of this invention provides a novel type molded body, and provides a mortar or paste and concrete product and desirable manufacturing techniques to produce the same.
BACKGROUND ART
Cement paste, mortar and concrete which are obtained by molding cement type admixed and kneaded material are now widely used for various engineering works and for constructing buildings. For constructing such engineering works and buildings various materials such as metal, wood, synthetic resin and glass. Among these materials, molded products of mortar and concrete are the most important, and are used widely as indispensable materials.
Such cement type materials have excellent compression strength and corrosion resistant strength, so that the cement type materials are widely used for constructing a base, an outer wall and a roof of buildings or the like which manifest excellent properties which can not be obtained by using other materials. More particularly, the cement type molded products can be produced at a substantially lower cost than such other materials as metals and synthetic resins. Such low cost can be obtained since the concrete products can readily be obtained by using sand, gravel and water which are natural products.
Although the cement type molded products manufactured by using mortar or concrete can be manufactured at a low cost and have excellent compression strength which can not be obtained when such other materials as metal and synthetic resin are used, the bending strength and pulling strength of the cement type molded products are low. For example, the bending strength of the cement type molded products is low, that is less than 100 kgf/cm.sup.2. For this reason, the field of use of the cement type molded products is limited.
Various investigations have been made for improving the strength of the concrete type molded products. In recent years, a typical method is disclosed in Japanese Patent Publication (JP, B) No. 13,956/1988. According to the method disclosed in this publication, the quantity of a liquid (primary water) used to adhere to a fine aggregate is limited in a narrow range. Then a cement powder is admixed with the wet aggregate so as to cause the cement powder to adhere to the surface of the fine aggregate. Then a quantity of the mixing and kneading water (secondary water) is added for effecting mixing and kneading to obtain a mixture having fluidity and moldability. In this mixture, the cement powder is mixed with the secondary water to form a powder having excellent sliding property, thereby forming a close bonding state which is effective to obtain substantial strength.
However, the strength obtained by this method is the compression strength and its highest value is a most 800 kgf/cm.sup.2 as shown in the Table 8 of the Publication. There is no technical reason for improving the bending strength. The actual bending strength is 70 to 115 kgf/cm.sup.2 as shown in the Table 8, together with the compression strength, such low value of the bending strength does not exceed the prior technical level.
As a method of improving the bending strength of the cement type product, so called resin concrete has been proposed in which a synthetic resin is admixed with the cement type concrete. It has been reported that the bending strength has increased to 1,000 kgf/cm.sup.2 or more. However, according to this method, the reason for increasing the bending strength depends upon the quality and quantity of the incorporated synthetic resin. This reason is fundamentally different than the reason i
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Kaga Kikuo
Kato Kazumi
Nitta Tatsuo
Osawa Seihachi
Sonoda Hiroki
Marcantoni Paul
Mitomo Shoji Kabushiki Kaisha
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