INFLUENCE OF ZEOLITIZED PERLITE ON BLENDED CEMENT PROPERTIES
2016
Perlite is the mineral of volcanic origin. Expanded perlite has good heat
insulation and sound absorption properties. It is light, resistant to fire,
moisture and micro-organisms, harmless to health. However, due to the
presence of hyaline phase, its use in Portland cement mixture is problematic.
In this paper, the zeolitization of expanded perlite was carried out to
improve its hydraulic properties. The conversion of expanded perlite into
zeolite material was carried out when Na2O : Al2O3 : SiO2 : H2O molar ratio
was equal to 2: 1: 2: 10 and the suspension of starting materials was treated
for 3 hours at 100°C temperature. Mechanical and physical properties of
hardened cement paste containing 0%, 5%, 10%, and 15% of pure perlite
admixtures, zeolitized perlite, and perlite altered to calcium (Ca2+) zeolite
were researched. The results showed that zeolitization of expanded perlite
activates its hydraulic properties; after 28 days of hydration under normal
conditions, the compressive strength of the specimens modified with 5% of
zeolitized perlite admixture was 49-50 MPa, whereas the compressive strength
of the specimens containing 5% of pure perlite admixture was only 33 MPa.
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