Fly and bottom ashes from biomass combustion as cement replacing components in mortars production: rheological behaviour of the pastes and materials compression strength.

Abstract:

:In the present research mortar pastes obtained by replacing a commercial cement with the equivalent mass of 5, 10, 20 and 30 wt.% of fly ash or bottom ash from fir chips combustion, were prepared and rheologically characterized. It was observed that the presence of ash modifies their rheological behaviour with respect to the reference blend due to the presence, in the ashes, of KCl and K2SO4 which cause precipitation of gypsum and portlandite during the first hydration stages of the pastes. Hydrated materials containing 5 wt.% of ash display compression strength and absorption at 28 d of same magnitude as the reference composition; conversely, progressive increase of ash cause a continuous decline of materials performances. Conversely, samples tested after 180 d display a marked decline of compression strength, as a consequence of potassium elution and consequent alkali-silica reaction against materials under curing.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Maschio S,Tonello G,Piani L,Furlani E

doi

10.1016/j.chemosphere.2011.06.070

subject

Has Abstract

pub_date

2011-10-01 00:00:00

pages

666-71

issue

4

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(11)00727-2

journal_volume

85

pub_type

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