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Concrete construction material and method adapted to prevent chemical corrosion of metals located adjacent thereto
| Details |
Inventors: Nakayama, Norio;
Assignee: Director-General of Agency of Industrial Science and Technology (JP)
Primary Examiner: Dixon, Jr.; William R.
Assistant Examiner: Einsmann; Margaret
Attorney, Agent or Firm: Lorusso & Loud
A construction material including a concrete body, a metallic material embedded within the concrete body, and an organophosphorus compound, such as an organic phosphonic acid or a salt thereof, dispersed within the concrete body. Chemical corrosion of pipes or the like metals extending from such a construction material into an environment which is less alkaline an the concrete body, such as soil, can be prevented by incorporation of the organic phosphorus material. |
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DETAILED DESCRIPTION It is, therefore, the prime object of the present invention to provide a construction material which includes a concrete body and a metallic material embedded within the concrete body and which can prevent or minimize the corrosion of metals extending therefrom into soil or water.
Another object of the present invention is to provide a method effective to prevent macrocell corrosion of metals.
In accomplishing the foregoing objects, there is provided in accordance with the present invention a construction material comprising a concrete body, a metallic material embedded within said concrete body, and an organophosphorus compound dispersed within said concrete body.
The present invention provides a method of producing a construction material, comprising the steps of: providing a hardenable composition containing cement, sand and water; mixing an organophosphorus compound with said composition to obtain a mixture, the amount of said organophosphorus compound being 0.
0001-0.
1% based on the weight of the cement; placing a metallic material in position; forming said mixture into a desired shape with said metallic material being surrounded by said mixture; and then hardening said mixture.
In a further aspect, the present invention provides a method of preventing the corrosion of a first metallic material located in an environment outside of a construction material which comprises an alkaline structural body and a second metallic material embedded within said structural body and electrically contacted with said first metallic material, said environment being neutral, acidic or less alkaline than said alkaline structural body, said method being characterized in that an organophosphorus compound is dispersed within said alkaline structural body in an amount effective to suppress the occurrence of a cathodic reaction resulting in the formation of hydroxy ion on said second metallic material.
When a metallic material M with a valency m is placed in an alkaline environment, the following cathodic reaction (1) and anodic reaction (2) generally take place on its surface: O
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Optical Systems 
