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    Sulfuric acid resistance of one-part alkali-activated mortars

    New search for: Sturm, P.
    New search for: Gluth, G.J.G.
    New search for: Jäger, C.
    New search for: Brouwers, H.J.H.
    New search for: Kühne, H.C.

    One-part alkali-activated (geopolymer) mortars based on three different silica-rich starting materials and sodium aluminate, with and without ground granulated blast furnace slag (GGBFS) addition, were tested regarding sulfuric acid resistance according to DIN 19573:2016-03 (70 days at pH = 1). Corresponding pastes were characterized by XRD, SEM, chemical analysis, 29 Si MAS NMR and 1 H- 29 Si CPMAS NMR after water storage and after acid exposure. The mortars exhibited a high resistance against sulfuric acid attack, with the best ones conforming to the requirements of DIN 19573:2016-03. The analytical results showed that this was due to precipitation of silica gel at the acid-mortar interface, which formed a mechanically stable layer that protected the subjacent mortar and thus inhibited further degradation. The addition of GGBFS decreased the acid resistance via formation of expansive calcium sulfate phases.

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    Sulfuric acid resistance of one-part alkali-activated mortars

    New search for: Sturm, P.
    New search for: Gluth, G.J.G.
    New search for: Jäger, C.
    New search for: Brouwers, H.J.H.
    New search for: Kühne, H.C.

    One-part alkali-activated (geopolymer) mortars based on three different silica-rich starting materials and sodium aluminate, with and without ground granulated blast furnace slag (GGBFS) addition, were tested regarding sulfuric acid resistance according to DIN 19573:2016-03 (70 days at pH = 1). Corresponding pastes were characterized by XRD, SEM, chemical analysis, 29 Si MAS NMR and 1 H- 29 Si CPMAS NMR after water storage and after acid exposure. The mortars exhibited a high resistance against sulfuric acid attack, with the best ones conforming to the requirements of DIN 19573:2016-03. The analytical results showed that this was due to precipitation of silica gel at the acid-mortar interface, which formed a mechanically stable layer that protected the subjacent mortar and thus inhibited further degradation. The addition of GGBFS decreased the acid resistance via formation of expansive calcium sulfate phases.

    Access

    Download

    Sulfuric acid resistance of one-part alkali-activated mortars

    New search for: Sturm, P.
    New search for: Gluth, G.J.G.
    New search for: Jäger, C.
    New search for: Brouwers, H.J.H.
    New search for: Kühne, H.C.

    One-part alkali-activated (geopolymer) mortars based on three different silica-rich starting materials and sodium aluminate, with and without ground granulated blast furnace slag (GGBFS) addition, were tested regarding sulfuric acid resistance according to DIN 19573:2016-03 (70 days at pH = 1). Corresponding pastes were characterized by XRD, SEM, chemical analysis, 29 Si MAS NMR and 1 H- 29 Si CPMAS NMR after water storage and after acid exposure. The mortars exhibited a high resistance against sulfuric acid attack, with the best ones conforming to the requirements of DIN 19573:2016-03. The analytical results showed that this was due to precipitation of silica gel at the acid-mortar interface, which formed a mechanically stable layer that protected the subjacent mortar and thus inhibited further degradation. The addition of GGBFS decreased the acid resistance via formation of expansive calcium sulfate phases.

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    Title:

    Sulfuric acid resistance of one-part alkali-activated mortars

    Contributors:

    Sturm, P. (author) / Gluth, G.J.G. (author) / Jäger, C. (author) / Brouwers, H.J.H. (author) / Kühne, H.C. (author)

    Publication date:

    2018-07-01

    Remarks:

    Sturm , P , Gluth , G J G , Jäger , C , Brouwers , H J H & Kühne , H C 2018 , ' Sulfuric acid resistance of one-part alkali-activated mortars ' , Cement and Concrete Research , vol. 109 , pp. 54-63 . https://doi.org/10.1016/j.cemconres.2018.04.009

    DOI:

    https://doi.org/10.1016/j.cemconres.2018.04.009

    Type of media:

    Article (Journal)

    Type of material:

    Electronic Resource

    Language:

    English

    Keywords:

    Alkali activated cement (D) , Characterization (B) , Durability (C) , One-part geopolymers , Spectroscopy (B)

    Classification:

    DDC:  624

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