Method of increasing density and strength of highly siliceous ce

Details Method of increasing density and strength of highly siliceous ce Method of increasing density and strength of highly siliceous ce

1995-05-25

1996-07-02

Bell, Mark L.

Compositions: coating or plastic

Coating or plastic compositions

Inorganic settable ingredient containing

106705, 106706, 106714, 106718, 106789, 106811, 106812, 106819, 106738, 106DIG1, 264340, 427421, 427427, 4274301, 4274432, 427444, C04B 1404, C04B 1406

Patent

active

055318240

ABSTRACT:
High-strength, high-hardness concrete, mortar, or grout is prepared by blending portland cement, water, and aggregate with a source of reactive silica, pouring the concrete mixture into a form, allowing the concrete to cure until it reaches its conventional 28-day strength, and immersing the cured concrete in a solution of alkali metal hydroxide and aluminum nitrate at 60.degree.-110.degree. C. for 3-14 days. Alternatively, the cured concrete may be sprayed with the solution and maintained at 60.degree.-110.degree. C. for 3-14 days. A dense, hard surface layer of alkali metal aluminum silicate is formed, the compressive strength and surface hardness of the concrete is increased, and the water infiltration rate into the concrete is decreased.

REFERENCES:
patent: 3047407 (1962-07-01), Ehrenburg
patent: 3885979 (1975-05-01), Rio et al.
patent: 4234347 (1980-11-01), Kirilishin
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patent: 4842649 (1989-06-01), Heitzmann et al.
patent: 5071579 (1991-12-01), Joshston et al.
patent: 5076851 (1991-12-01), Skovara et al.
patent: 5314755 (1994-05-01), Malric et al.
patent: 5352288 (1994-10-01), Mallow
patent: 5374308 (1994-12-01), Kirkpatrick et al.

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