Italcementi

Antonio Princigallo

Stefano Cangiano

The present invention relates to a cementitious composition adapted to form mortars or cements comprising glass as an additive having reduced tendency to reaction with alkali, characterized in that said glass is obtained by grinding and subsequent washing with water.

Activated pulverised glass as an additive for mortars and cement, and related cementitious products

The invention has as object a cementitious composition for forming mortars or concretes having reduced tendency to react with alkali, characterized in that it comprises as additive at least a compound of general formula:[R&#x2014;N&#x2014;(CH&#x2014;COOH)]&#x2003;&#x2003;(I)R being an aliphatic or aromatic hydrocarbon chain, n=2 or 3 and x=1 or 2.

Cementitious composition for forming mortars or concretes having reduced tendency to react with alkali

The present invention concerns a hydraulic binder comprising a ground blast furnace slag in an amount comprised between 30% and 95% by mass on the binder, Portland cement clinker in an amount equal to or greater than 5% by mass on the binder, and at least one sulphate as activator, characterised in that said slag has the following properties and composition by mass: grinding fineness greater than 4000 cm2/g Blaine glass content greater than 80% SiO: 30-40% AlO: 9-13% CaO: 34-42% with a (CaO+MgO)/(AlO+SiO) ratio greater than 1; and in that said sulphate is contained in a total amount, expressed as SO, comprised between 0.6% and 4.5% by mass on the binder.

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Stezzano, Italy

Antonio Princigallo