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Influence of micro and nano-sized RHAs on hydration and compressive strength of cement based pastes



Title: Influence of micro and nano-sized RHAs on hydration and compressive strength of cement based pastes
Author(s): G.C. Cordeiro, S.P.B. Lima, E.M.R. Fairbairn, R.D. Toledo Filho
Paper category : conference
Book title: International RILEM Conference on Advances in Construction Materials Through Science and Engineering
Editor(s): Christopher Leung and K.T. WAN
ISBN: 978-2-35158-116-2
e-ISBN: 978-2-35158-117-9
Publisher: RILEM Publications SARL
Publication year: 2011
Pages: 756 - 764
Total Pages: 9
Nb references: 10
Language: English


Abstract: This work presents a study about the effect of micro and nano-sized pozzolans produced from rice husk ash (RHA) with high carbon content on the hydration characteristics of Portland cement based pastes. The micro and nano-sized (silica gel) RHAs were generated in grinding and hydrothermal processes, respectively. Pastes containing 0% (reference), 5% in mass of nano-sized RHA and 20% of micro-sized RHA were prepared at different water-binder ratios and cured in 21°C water periods from 1 to 90 days. The hydration of the pastes was investigated by X-ray diffraction analysis and scanning electron microscopy. The compressive strength was determined for the pastes containing RHAs in different times (7 and 28 days). The results indicated that the mixtures containing nano-sized RHA showed improved mechanical behavior over all time periods evaluated. Furthermore, the pastes with micro-RHA presented similar strength in comparison with the reference paste.


Online publication: 2011-10-31
Publication type : full_text
Public price (Euros): 0.00