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
Chemospherejournal_title
Chemosphereauthors
Maschio S,Tonello G,Piani L,Furlani Edoi
10.1016/j.chemosphere.2011.06.070subject
Has Abstractpub_date
2011-10-01 00:00:00pages
666-71issue
4eissn
0045-6535issn
1879-1298pii
S0045-6535(11)00727-2journal_volume
85pub_type
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