Addition of acidulated pozzolan to concrete and concrete product

Details Addition of acidulated pozzolan to concrete and concrete product Addition of acidulated pozzolan to concrete and concrete product

1974-04-10

1976-04-27

Poer, J.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 98, 106117, 106120, C04B 702

Patent

active

039532224

ABSTRACT:
The method of making concrete products, and the resulting products, in which pozzolans are added to the concrete or substituted for some of the Portland Cement therein after the pozzolan has been acidulated by treatment with a strong mineral acid selected to convert non-siliceous metallic oxides therein into other salts which can be separated out, leaving SiO.sub.2 spheres whose surfaces are cleaned and pock-marked to provide greater active surface area, thereby increasing the pozzolanic activity. Acids are chosen so that an unwashed acidulated pozzolan can remain wet for example, either with chlorides as accelerators, or with sulphates as retarders when added to the cement mix.

REFERENCES:
patent: 1873642 (1932-08-01), Guertler
patent: 2698251 (1954-12-01), Shea et al.
patent: 2698256 (1954-12-01), Shea et al.

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