Claims
- 1. Building component based on coal ash which has been manufactured by molding a material containing coal ash into an unhardened building component and then hardening said component at elevated temperature of between 30.degree. and 100.degree. C. in an environment containing water vapor, wherein said hardened material containing coal has comprises a mixture of a coal ash which contains free CaO and free CaSO.sub.4.OH.sub.2 O and a fly ash which contains SiO.sub.2 and is essentially free of free CaO and free CaSO.sub.4.H.sub.2 O and water, which mixture has been subjected to a heat treatment prior to said molding thereby preventing the subsequent formation of ettringite in said building component.
- 2. Building component according to claim 1, in which prior to the molding into an unhardened building component sand has been added to the material containing coal ash.
- 3. Building component according to claim 1, in which the material containing coal ash is hardenable granules which have been obtained by granulating the mixture of CaO and CaSO.sub.4.O H.sub.2 O containing coal ash; fly-ash which is free of free CaO and CaSO.sub.4.O H.sub.2 O and water subsequent to the heat treatment.
- 4. Building component according to claim 1, in which the material containing coal ash comprises a mixture of granules containing coal ash, which granules have been hardened at a temperature between 30.degree. and 100.degree. C., at atmospheric pressure and in a moisture containing atmosphere and a hardenable mixture, after which the mixture of granules containing coal ash and the hardenable mixture is molded into a building component and hardened; said hardenable mixture being selected from the group consisting of mixtures of fly ash, slaked lime and water, and conventional mortar.
- 5. Building component according to claim 1, in which said mixture of a coal ash and a fly ash comprises at least 1% by weight free CaO and at least 1% by weight free CaSO.sub.4.O H.sub.2 O, and at least 20% by weight of said fly ash.
- 6. Building component according to claim 5, in which said mixture of a coal ash and a fly ash comprises between about 2%-15% by weight free CaO, about 2%-15% by weight free CaSO.sub.4.O H.sub.2 O, and about 30%-70% by weight of said fly ash.
- 7. Building component according to claim 4, in which said building component is a building block.
Priority Claims (1)
Number |
Date |
Country |
Kind |
8801506 |
Jun 1988 |
NLX |
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Parent Case Info
This is a continuation of co-pending application Ser. No. 07/365/679 filed on Jun. 13, 1989, now U.S. Pat. No. 5,002,611.
US Referenced Citations (5)
Foreign Referenced Citations (1)
Number |
Date |
Country |
222457 |
May 1987 |
EPX |
Divisions (1)
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Number |
Date |
Country |
Parent |
365679 |
Jun 1989 |
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