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Inexpensive intumescent alkali-activated natural pozzolan pastes
Perlite, a natural pozzolan, was activated with NaOH to prepare alkali-activated (AA) intumescent pastes. After curing at 100 °C for 3–24 h, the solidified pastes had medium strengths, up to 40 MPa, and low densities, ∼1500–2000 kg/m3, compared to Portland cement pastes. Upon heating, volume expansion in the 200–600 °C range resulted in a porous solid. Expansion occurs due to a loss of silanol condensation water, as vapor. Chemical composition of the pozzolan, activator content, and heat-treatment temperature influence the size and amount of pores formed. Mechanical, physical, and microscopic investigations were made. Volume increases up to 225% were measured. Densities decreased to as low as ∼450 kg/m3 after heat treatment and cooling. Strengths of porous products were in the 3–7 MPa range. Such materials able to intumesce over specific temperature ranges could be useful in applications where absorption of thermal energy is necessary, such as passive fire protection.
Inexpensive intumescent alkali-activated natural pozzolan pastes
Perlite, a natural pozzolan, was activated with NaOH to prepare alkali-activated (AA) intumescent pastes. After curing at 100 °C for 3–24 h, the solidified pastes had medium strengths, up to 40 MPa, and low densities, ∼1500–2000 kg/m3, compared to Portland cement pastes. Upon heating, volume expansion in the 200–600 °C range resulted in a porous solid. Expansion occurs due to a loss of silanol condensation water, as vapor. Chemical composition of the pozzolan, activator content, and heat-treatment temperature influence the size and amount of pores formed. Mechanical, physical, and microscopic investigations were made. Volume increases up to 225% were measured. Densities decreased to as low as ∼450 kg/m3 after heat treatment and cooling. Strengths of porous products were in the 3–7 MPa range. Such materials able to intumesce over specific temperature ranges could be useful in applications where absorption of thermal energy is necessary, such as passive fire protection.
Inexpensive intumescent alkali-activated natural pozzolan pastes
Erdogan, S.T. (author)
Journal of the European Ceramic Society ; 35 ; 2663-2670
2015
8 Seiten, 49 Quellen
Article (Journal)
English
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