Milling of peat-wood fly ash : effect on water demand of mortar and rheology of cement paste
Rissanen, Jouni; Ohenoja, Katja; Kinnunen, Paivo; Romagnoli, Marcello; Illikainen, Mirja (2018-06-05)
Jouni Rissanen, Katja Ohenoja, Paivo Kinnunen, Marcello Romagnoli, Mirja Illikainen, Milling of peat-wood fly ash: Effect on water demand of mortar and rheology of cement paste, Construction and Building Materials, Volume 180, 2018, Pages 143-153, ISSN 0950-0618, https://doi.org/10.1016/j.conbuildmat.2018.05.014
© 2018 The Authors. Published by Elsevier Inc. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
https://creativecommons.org/licenses/by-nc-nd/4.0/
https://urn.fi/URN:NBN:fi-fe2019121848818
Tiivistelmä
Abstract
The milling of fluidized bed combustion fly ashes is a promising method to improve ashes’ properties as a cement replacement material. Two fly ashes from the co-combustion of peat and wood, as well as inert sand were milled at varying times. The physical properties of materials, water demand of mortar and rheology of cement paste were studied. At 25% cement replacement rate, the milling decreased the water demand of mortar by 10% and the yield stress of cement paste by 33%. It was found that milling disintegrated irregularly shaped particles, which were the main reason for high water demand of ashes, and tapped density could be used as a simple parameter to estimate the water demand for all studied materials.
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