Search Results - "van Deventer, Jannie S.J."

Gel nanostructure in alkali-activated binders based on slag and fly ash, and effects of accelerated carbonation by Bernal, Susan A., Provis, John L., Walkley, Brant, San Nicolas, Rackel, Gehman, John D., Brice, David G., Kilcullen, Adam R., Duxson, Peter, van Deventer, Jannie S.J.

“…Binders formed through alkali-activation of slags and fly ashes, including ‘fly ash geopolymers’, provide appealing properties as binders for low-emissions…”
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Phase evolution of C-(N)-A-S-H/N-A-S-H gel blends investigated via alkali-activation of synthetic calcium aluminosilicate precursors by Walkley, Brant, San Nicolas, Rackel, Sani, Marc-Antoine, Rees, Gregory J., Hanna, John V., van Deventer, Jannie S.J., Provis, John L.

“…Stoichiometrically-controlled alkali-activated pastes containing calcium-(sodium) aluminosilicate hydrate (C-(N)-A-S-H) and sodium aluminosilicate hydrate…”
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The interrelationship between surface chemistry and rheology in alkali activated slag paste by Kashani, Alireza, Provis, John L., Qiao, Greg G., van Deventer, Jannie S.J.

“…[Display omitted] •Surface chemistry controls rheology in alkali-activated slag cements.•Particle–particle interactions and gelation influenced by activator…”
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The Role of Al in Cross-Linking of Alkali-Activated Slag Cements by Myers, Rupert J., Bernal, Susan A., Gehman, John D., van Deventer, Jannie S.J., Provis, John L.

“…The structural development of a calcium (sodium) aluminosilicate hydrate (C–(N‐)A–S–H) gel system, obtained through the reaction of sodium metasilicate and…”
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Influence of fly ash on the water and chloride permeability of alkali-activated slag mortars and concretes by Ismail, Idawati, Bernal, Susan A., Provis, John L., San Nicolas, Rackel, Brice, David G., Kilcullen, Adam R., Hamdan, Sinin, van Deventer, Jannie S.J.

“…•Addition of fly ash to alkali-activated slag mortars and concretes increases porosity and chloride permeability.•High-temperature pre-conditioning of samples…”
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MgO content of slag controls phase evolution and structural changes induced by accelerated carbonation in alkali-activated binders by Bernal, Susan A., San Nicolas, Rackel, Myers, Rupert J., Mejía de Gutiérrez, Ruby, Puertas, Francisca, van Deventer, Jannie S.J., Provis, John L.

“…The structural development and carbonation resistance of three silicate-activated slags (AAS) with varying MgO contents (<7.5wt.%) are reported. AAS with lower…”
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X-ray microtomography shows pore structure and tortuosity in alkali-activated binders by Provis, John L., Myers, Rupert J., White, Claire E., Rose, Volker, van Deventer, Jannie S.J.

“…Durability of alkali-activated binders is of vital importance in their commercial application, and depends strongly on microstructure and pore network…”
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Drying-induced changes in the structure of alkali-activated pastes by Ismail, Idawati, Bernal, Susan A., Provis, John L., Hamdan, Sinin, van Deventer, Jannie S. J.

“…Drying of cement paste, mortar, or concrete specimens is usually required as a pre-conditioning step prior to the determination of permeability-related…”
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Synthesis of stoichiometrically controlled reactive aluminosilicate and calcium-aluminosilicate powders by Walkley, Brant, San Nicolas, Rackel, Sani, Marc-Antoine, Gehman, John D., van Deventer, Jannie S.J., Provis, John L.

“…Aluminosilicate and calcium-aluminosilicate powders are synthesised via an organic steric entrapment route under conditions permitting strict stoichiometric…”
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Reduction of gold(III) chloride to gold(0) on silicate surfaces by Mohammadnejad, Sima, Provis, John L., van Deventer, Jannie S.J.

“…[Display omitted] ► Gold chloride is reduced to metallic gold on defect sites of silicate surfaces. ► Reprecipitated silicate gels formed during acidic…”
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The role of sulfide in the immobilization of Cr(VI) in fly ash geopolymers by Zhang, Jianguo, Provis, John L., Feng, Dingwu, van Deventer, Jannie S.J.

“…The use of fly ash-based geopolymer binders to immobilize chromium is investigated in detail, with particular regard to the role of the sulfide ion as a…”
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Adsorption of gold on albite in acidic chloride media by Feng, Dingwu, Provis, John L., van Deventer, Jannie S.J.

“…The ability of albite, an aluminosilicate mineral typical of those present in many gold ores, to adsorb gold is examined at varied pH levels in chloride media…”
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Modification of phase evolution in alkali-activated blast furnace slag by the incorporation of fly ash by Ismail, Idawati, Bernal, Susan A., Provis, John L., San Nicolas, Rackel, Hamdan, Sinin, van Deventer, Jannie S.J.

“…The microstructural evolution of alkali-activated binders based on blast furnace slag, fly ash and their blends during the first six months of sealed curing is…”
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Characterisation of One-Part Geopolymer Binders Made from Fly Ash by Hajimohammadi, Ailar, van Deventer, Jannie S. J.

“…The kinetics of one-part “just add water” geopolymerisation reaction is studied in the system of fly ash as an aluminosilicate precursor and solid sodium…”
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Technical and commercial progress in the adoption of geopolymer cement by Van Deventer, Jannie S.J., Provis, John L., Duxson, Peter

“…CO2 emissions of various cement binders as a function of OPC content. [Display omitted] ► Alkali activated slag and ash cement has 80% less CO2 emissions than…”
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Alkali activated slag foams: The effect of the alkali reaction on foam characteristics by Hajimohammadi, Ailar, Ngo, Tuan, Mendis, Priyan, Kashani, Alireza, van Deventer, Jannie S.J.

“…The effect of the alkali activation reaction on the characteristics of slag-based foams made by the mechanical foaming technique is investigated. The…”
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Structural evolution of synthetic alkali-activated CaO-MgO-Na2O-Al2O3-SiO2 materials is influenced by Mg content by Walkley, Brant, San Nicolas, Rackel, Sani, Marc-Antoine, Bernal, Susan A., van Deventer, Jannie S.J., Provis, John L.

“…Stoichiometrically controlled alkali-activated materials within the system CaO-MgO-Na2O-Al2O3-SiO2 are produced by alkali-activation of high-purity synthetic…”
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Dissolution behaviour of source materials for synthesis of geopolymer binders: A kinetic approach by Hajimohammadi, Ailar, van Deventer, Jannie S.J.

“…Controlling the initial release rate of alumina and silica from source materials is known to have a significant effect on the nanostructure of geopolymer gel…”
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Accelerated carbonation testing of alkali-activated binders significantly underestimates service life: The role of pore solution chemistry by Bernal, Susan A., Provis, John L., Brice, David G., Kilcullen, Adam, Duxson, Peter, van Deventer, Jannie S.J.

“…The carbonation resistance of alkali-activated binders is often tested via accelerated test protocols designed for Portland cements, without questioning…”
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Effect of calcium silicate sources on geopolymerisation by Yip, Christina K., Lukey, Grant C., Provis, John L., van Deventer, Jannie S.J.

“…Seven different calcium silicate materials were used to investigate the role of calcium in geopolymerisation. At low alkalinity, the compressive strength of…”
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