Microstructure of lime and lime-pozzolana pastes with nanosilica

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• 作者：Cristiana Nunes^a ; ^{nunes@itam.cas.cz" class="auth_mail" title="E-mail the corresponding author} ; Zuzana Slí ; žková ; ^a ; ^{slizkova@itam.cas.cz" class="auth_mail" title="E-mail the corresponding author} ; Maria Stefanidou^b ; ^{stefan@civil.auth.gr" class="auth_mail" title="E-mail the corresponding author} ; Jiří ; Němeček^c ; ^{jiri.nemecek@fsv.cvut.cz" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Nanosilica ; Pozzolana (D) ; Surface area (B) ; Elastic moduli (C) ; Microstructure (B)
• 刊名：Cement and Concrete Research
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：83
• 期：Complete
• 页码：152-163
• 全文大小：4441 K

文摘

Nanosilica particles (nS) were added to lime (L) and lime-pozzolana (LP) pastes to study the effect of nS as a pozzolanic admixture in L and to synergistically improve the pozzolanic reactivity of LP. Relationships between microstructure and mechanical properties of the pastes were examined. The macroporosity of both pastes decreased, and the compressive strength increased. SEM and X-ray μ-CT analysis accounted for explaining the inconsistent results between the porosity obtained by MIP and density by He-pycnometry. The strong pozzolanic reaction in LPnS explained the high consumption of mixing water, increment of density, and pores assigned to CSH. The SEM analysis also showed that BET and BJH can give erroneous results regarding the adsorption/desorption isotherms, thus affecting the values of the specific surface area and nanoporosity.