ESTONIAN ACADEMY
PUBLISHERS
eesti teaduste
akadeemia kirjastus
PUBLISHED
SINCE 1984
 
Oil Shale cover
Oil Shale
ISSN 1736-7492 (Electronic)
ISSN 0208-189X (Print)
Impact Factor (2020): 0.934

SELF-CEMENTING PROPERTIES AND ALKALI ACTIVATION OF ENEFIT280 SOLID HEAT CARRIER RETORTING ASH; pp. 263–278

Full article in PDF format | https://doi.org/10.3176/oil.2017.3.05

Authors
PEETER PAAVER, PÄÄRN PAISTE, RIHO MÕTLEP, KALLE KIRSIMÄE

Abstract

The composition and cementitious properties upon hydration and alkali activation of the solid heat carrier (SHC) ash produced in a new Enefit280 retort was studied. The Enefit280 waste heat boiler (WHB) ash is different from other SHC solid residues. It does not contain residual organics, but is characterized by a low content of reactive Ca-phases and the soluble amorphous (aluminium)-silicate phase/glass material. Cementation of Enefit280 ash upon hydration with plain water is limited and its uniaxial compressive strength stays < 4 MPa after 28 days of curing. Ash mixtures activated with sodium silicate based mixtures show higher compressive strength values, reaching > 10 MPa after 28 days of curing. The Enefit280 ash, compared to other ash types forming in the Estonian oil shale pro­ces­sing industry, has significantly poorer self-cementing properties. This needs to be taken into account when designing waste depositories, if other types of ash with better self-cementing properties are not co-deposited with this ash.


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