Budapesti Muszaki Egyetem

Szilikatipari Kozponti Kutato Es Tervezo Intezet

Gyula Varju

Kalman Toth

Zoltan Juhasz

There is disclosed a process for preparing hydraulic binding materials having a high bonding capacity, starting from glassy pyrogenic rocks. According to the invention glassy pyrogenic rocks are mechanically activated by grinding. The activation time is 0.5 to 36 hours, preferably 4 to 12 hours, and the mechanical stress applied is higher than in case of the conventional fine grinding. The activated product is thereafter admixed with one or both of lime and cement.

Process for preparing hydraulic binding materials of high bonding

The invention relates to expanded products made from riolite glasses with a natural water content of at least 4 % by weight, as well as to a process for the preparation of such products. When preparing these expanded products a granulometric fraction of 0.3 to 3.0 mm. of the natural riolite glass is subjected to a heat treatment at 220.degree. to 400.degree. C for at least one hour, to reach a residual water content of 1 to 4 % by weight, and the obtained partially dehydrated substance is expanded at 800.degree. to 1300.degree. C. This way expanded products with high quality can be obtained.

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Budapest, Hungary

Gyula Varju