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Effect of additives on the compressive strength of slag-based inorganicpolymers

Zaharaki D., Komnitsas Konstantinos

Πλήρης Εγγραφή

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Περίληψη

The present paper aims to assess the effect of various additives on the compressive strengthof inorganic polymers (geopolymers) synthesised using low Ca electric arc ferronickel slagand alkali activating solutions. The main operating parameters include pre-curing (48 hours),temperature (40 to 80 oC), heating time (24 or 48 h) and aging period (7 days). Addition ofkaolinite, pozzolan, fly ash, red mud or CaO in the initial mixture has a detrimental effect onthe final compressive strength. Addition of pulverised silica sand improves strength slightly,whereas addition of commercial glass results in strength values exceeding 60 MPa. XRDanalysis was carried out to identify new formed phases and the degree of amorphicity, whileSEM and element mapping analysis were used to identify the morphology of the finalproducts as well as to elucidate to a certain degree the mechanisms involved in inorganicpolymer synthesis

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