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Effect of TiO2 and 11 minor elements on the reactivity of ground‐granulated blast‐furnace slag in blended cements

Abstract : Ground granulated blast furnace slags (GGBS) are glasses (>99%) of the CaO-Al 2 O 3-SiO 2 compositional system and are widely used as supplementary cementitious materials. Differences in reactivity of GGBS were screened by modifying the content of 11 minor elements (namely Ba, Ce, Cs, Cr, Mn, P, Sn, Sr, Ti, V, Zr). SEM observations showed that most elements entered the silicate glass matrix, only Sn was reduced to its metallic form and P accumulated in minor minerals. Mortar strength tests showed that 2d-compressive strength was reduced by > 50% for a TiO 2 content of 2.5 wt.% in the slag. At 28 days the loss in compressive strength was still > 40%. Calorimetric tests on other element additions showed that network modifiers (Ba, Cs and Sr) and GGBS reactivity are positively correlated, whereas Ce, Cr, V and Zr significantly decreased reactivity. It is shown that these effects can be well estimated by the weighted field strength of the added element.
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https://hal.archives-ouvertes.fr/hal-02931126
Contributor : Simon Blotevogel <>
Submitted on : Friday, September 4, 2020 - 7:26:12 PM
Last modification on : Tuesday, September 22, 2020 - 1:12:02 PM

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Simon Blotevogel, Laurent Steger, Daniel Hart, Lola Doussang, Judit Kaknics, et al.. Effect of TiO2 and 11 minor elements on the reactivity of ground‐granulated blast‐furnace slag in blended cements. Journal of the American Ceramic Society, Wiley, 2020, ⟨10.1111/jace.17431⟩. ⟨hal-02931126⟩

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