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  1. Book ; Online: Innovation in Cements for Sustainability

    Provis, John L. / Juenger, Maria / Komljenovic, Miroslav

    2020  

    Keywords Civil engineering, surveying & building ; Mechanical engineering & materials ; cement ; sustainability ; construction ; concrete ; alkali-activated (AA) cement
    Size 1 electronic resource (121 pages)
    Publisher Frontiers Media SA
    Document type Book ; Online
    Note English ; Open Access
    HBZ-ID HT021229965
    ISBN 9782889633463 ; 2889633462
    Database ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

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  2. Book ; Online: Frontiers in Materials: Rising Stars

    Maria Pugno, Nicola / Cazorla-Amoros, Diego / Chen, Jie-Sheng / Song, Guang-Ling / A Akbar, Sheikh / Wondraczek, Lothar / Pegoretti, Alessandro / Choi, Seung-Bok / Provis, John L. / Chu, Jinn P. / Kordas, Krisztian / Dai, Liming

    2020  

    Keywords Civil engineering, surveying & building ; Mechanical engineering & materials ; Mechanics of Materials ; Smart Materials ; Carbon-Based Materials ; Polymeric and Composite Materials ; Glass Science ; Functional Ceramics ; Structural Materials ; Colloidal Materials and Interfaces ; Environmental Materials ; Thin Solid Films ; Translational Materials Science
    Size 1 electronic resource (687 pages)
    Publisher Frontiers Media SA
    Document type Book ; Online
    Note English ; Open Access
    HBZ-ID HT021230264
    ISBN 9782889635818 ; 2889635813
    Database ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

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  3. Article: Editorial-

    Provis, John L / Kearney, Sarah A

    Materials and structures

    2021  Volume 54, Issue 5, Page(s) 199

    Language English
    Publishing date 2021-10-15
    Publishing country Netherlands
    Document type Editorial
    ZDB-ID 2091922-0
    ISSN 1871-6873 ; 1359-5997
    ISSN (online) 1871-6873
    ISSN 1359-5997
    DOI 10.1617/s11527-021-01794-8
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Mechanisms of passivation and chloride-induced corrosion of mild steel in sulfide-containing alkaline solutions

    Mundra, Shishir / Provis, John L.

    Journal of materials science. 2021 Sept., v. 56, no. 26

    2021  

    Abstract: The pore fluid within many concretes is highly alkaline and rich in reduced sulfur species, but the influence of such alkaline-sulfide solutions on the surface film formed on steel reinforcement is poorly understood. This study investigates the critical ... ...

    Abstract The pore fluid within many concretes is highly alkaline and rich in reduced sulfur species, but the influence of such alkaline-sulfide solutions on the surface film formed on steel reinforcement is poorly understood. This study investigates the critical role of HS⁻ in defining mild steel passivation chemistry. The surface film formed on the steel in alkaline-sulfide solutions contains Fe(OH)₂ and Fe–S complexes, and the critical chloride concentration to induce corrosion increases at high sulfide concentration. However, this behavior is dependent on the duration of exposure of the steel to the electrolyte, and the nature of the sulfidic surface layer.
    Keywords chlorides ; corrosion ; electrolytes ; steel ; sulfides ; sulfur
    Language English
    Dates of publication 2021-09
    Size p. 14783-14802.
    Publishing place Springer US
    Document type Article
    ZDB-ID 2015305-3
    ISSN 1573-4803 ; 0022-2461
    ISSN (online) 1573-4803
    ISSN 0022-2461
    DOI 10.1007/s10853-021-06237-x
    Database NAL-Catalogue (AGRICOLA)

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  5. Article ; Online: The pore structure and water absorption in Portland/slag blended hardened cement paste determined by synchrotron X-ray microtomography and neutron radiography.

    Vigor, James E / Prentice, Dale P / Xiao, Xianghui / Bernal, Susan A / Provis, John L

    RSC advances

    2024  Volume 14, Issue 7, Page(s) 4389–4405

    Abstract: The pore structures of hardened Portland/slag cement pastes (>75 wt% slag content), and the initial capillary absorption of moisture through these pores, were monitored ... ...

    Abstract The pore structures of hardened Portland/slag cement pastes (>75 wt% slag content), and the initial capillary absorption of moisture through these pores, were monitored using
    Language English
    Publishing date 2024-02-01
    Publishing country England
    Document type Journal Article
    ISSN 2046-2069
    ISSN (online) 2046-2069
    DOI 10.1039/d3ra06489a
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Electrochemical cell design and impedance spectroscopy of cement hydration

    Sosa Gallardo, Aldo F / Provis, John L

    Journal of materials science. 2021 Jan., v. 56, no. 2

    2021  

    Abstract: Understanding the complexity of the chemical and microstructural evolution of cement during hydration remains a controversial subject, and although numerous techniques have been used to assess this process, further insight is still needed. Alternating ... ...

    Abstract Understanding the complexity of the chemical and microstructural evolution of cement during hydration remains a controversial subject, and although numerous techniques have been used to assess this process, further insight is still needed. Alternating current impedance spectroscopy has been demonstrated to be a sensitive and powerful technique for cement characterisation in both fresh and hardened states; however, it has also shown certain experimental limitations (e.g. data interpretation, electrode, and parasitic effects) that prevent its wider acceptance. This study assesses electrochemical cell design and the impedance response during cement hydration. The results show that a significant decrease in the parasitic effects at high frequencies (caused mainly by leads and electrode effects) can be achieved through an optimal cell design and impedance measurements correction, enabling correlation of impedance measurements to particular aspects of the cement hydration process. However, due the limited solid phase microstructural development and the high conductivity of cement paste at low degrees of hydration, the parasitic effects could not be fully eliminated for fresh or early-age cement pastes.
    Keywords cement ; dielectric spectroscopy ; electrochemistry ; electrodes ; microstructure
    Language English
    Dates of publication 2021-01
    Size p. 1203-1220.
    Publishing place Springer US
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 2015305-3
    ISSN 1573-4803 ; 0022-2461
    ISSN (online) 1573-4803
    ISSN 0022-2461
    DOI 10.1007/s10853-020-05397-6
    Database NAL-Catalogue (AGRICOLA)

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  7. Article ; Online: Reversible Adsorption of Polycarboxylates on Silica Fume in High pH, High Ionic Strength Environments for Control of Concrete Fluidity.

    Walkley, Brant / Geddes, Daniel A / Matsuda, Taku / Provis, John L

    Langmuir : the ACS journal of surfaces and colloids

    2022  Volume 38, Issue 5, Page(s) 1662–1671

    Abstract: Polycarboxylate-based superplasticizers are essential for production of ultrahigh-performance concrete (UHPC), facilitating particle dispersion through electrostatic repulsion and steric hindrance. This study examines for the first time the effect of ... ...

    Abstract Polycarboxylate-based superplasticizers are essential for production of ultrahigh-performance concrete (UHPC), facilitating particle dispersion through electrostatic repulsion and steric hindrance. This study examines for the first time the effect of changes in pH, ionic strength, and charge on the adsorption/desorption behavior of a polycarboxylate-based superplasticizer on silica fume in aqueous chemistries common in low-CO
    Language English
    Publishing date 2022-01-28
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2005937-1
    ISSN 1520-5827 ; 0743-7463
    ISSN (online) 1520-5827
    ISSN 0743-7463
    DOI 10.1021/acs.langmuir.1c02419
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: Reversible Adsorption of Polycarboxylates on Silica Fume in High pH, High Ionic Strength Environments for Control of Concrete Fluidity

    Walkley, Brant / Geddes, Daniel A. / Matsuda, Taku / Provis, John L.

    Langmuir. 2022 Jan. 28, v. 38, no. 5

    2022  

    Abstract: Polycarboxylate-based superplasticizers are essential for production of ultrahigh-performance concrete (UHPC), facilitating particle dispersion through electrostatic repulsion and steric hindrance. This study examines for the first time the effect of ... ...

    Abstract Polycarboxylate-based superplasticizers are essential for production of ultrahigh-performance concrete (UHPC), facilitating particle dispersion through electrostatic repulsion and steric hindrance. This study examines for the first time the effect of changes in pH, ionic strength, and charge on the adsorption/desorption behavior of a polycarboxylate-based superplasticizer on silica fume in aqueous chemistries common in low-CO₂ UHPC. Data from total organic carbon measurements, Fourier transform infrared and nuclear magnetic resonance spectroscopy, and zeta potential measurements reveal the silica surface chemistry and electrokinetic properties in simulated UHPC. Addition of divalent cations (Ca²⁺) results in polycarboxylate adsorption on silica fume via (i) adsorption of Ca²⁺ ions on the silica surface and a negative zeta potential of lower magnitude on the silica surface and (ii) reduction of polycarboxylate anionic charge density due to complexation with Ca²⁺ ions and counter-ion condensation. Addition of OH– ions results in polycarboxylate desorption via deprotonation of silanol groups and a negative zeta potential of greater magnitude on the silica surface. Simultaneous addition of both Ca²⁺ and OH– results in rapid polycarboxylate desorption via (i) formation of an electric double layer and negative zeta potential on the silica surface and (ii) an increase in polycarboxylate anionic charge density due to deprotonation of the carboxylate groups in the polymer backbone, complexation with Ca²⁺ ions, and counter-ion condensation. This provides an explanation for the remarkable fluidizing effect observed upon addition of small amounts (1.0 wt %) of a solid, powdered Ca source to fresh, low-CO₂, UHPC, which exhibits significantly higher fresh state pH (>13) than those based on Portland cement (pH 11).
    Keywords Fourier transform infrared spectroscopy ; adsorption ; calcium ; cement ; concrete ; deprotonation ; desorption ; electrostatic interactions ; ionic strength ; nuclear magnetic resonance spectroscopy ; pH ; polymers ; silica ; total organic carbon ; zeta potential
    Language English
    Dates of publication 2022-0128
    Size p. 1662-1671.
    Publishing place American Chemical Society
    Document type Article
    ZDB-ID 2005937-1
    ISSN 1520-5827 ; 0743-7463
    ISSN (online) 1520-5827
    ISSN 0743-7463
    DOI 10.1021/acs.langmuir.1c02419
    Database NAL-Catalogue (AGRICOLA)

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  9. Article: Time-resolved 3D characterisation of early-age microstructural development of Portland cement

    Vigor, James E. / Bernal, Susan A. / Xiao, Xianghui / Provis, John L.

    Journal of materials science. 2022 Feb., v. 57, no. 8

    2022  

    Abstract: Time-resolved in-situ synchrotron X-ray microtomography reveals new levels of detail about the chemical and physical processes that take place as Portland cement hardens. The conversion of a fluid paste into a hardened product can be monitored on a sub- ... ...

    Abstract Time-resolved in-situ synchrotron X-ray microtomography reveals new levels of detail about the chemical and physical processes that take place as Portland cement hardens. The conversion of a fluid paste into a hardened product can be monitored on a sub-minute time-scale, and with sample movement/settlement corrections applied to enable individual particles to be tracked as they react, hydrate, and become interconnected into a single strong monolith. The growth of the strength-giving hydrate phases surrounding cement grains, and of the fluid-filled pore network that surrounds them, is able to be directly viewed at the level of individual cement particles through the application of this tracking protocol. When cement is brought into contact with water, a layer which differs in density from the bulk of the cement grains becomes observable on the grain surfaces during the induction period (during which time the heat evolution from the paste is relatively low). As hydration continues, reaction products grow both from particle surfaces into the initially fluid-filled region, and also into the space originally occupied by the cement particles, forming a density gradient within the microstructure. As the reaction accelerates and larger volumes of solid phases precipitate, the newly-formed solid structure percolates via interconnection of agglomerated low-density outer hydrates, which then densify as hydration continues. This eventually leads to solidification of the structure into a hardened porous matrix.
    Keywords cement ; heat production ; micro-computed tomography ; microstructure ; solidification
    Language English
    Dates of publication 2022-02
    Size p. 4952-4969.
    Publishing place Springer US
    Document type Article
    ZDB-ID 2015305-3
    ISSN 1573-4803 ; 0022-2461
    ISSN (online) 1573-4803
    ISSN 0022-2461
    DOI 10.1007/s10853-022-06952-z
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  10. Article: Adsorption behaviour of simulant radionuclide cations and anions in metakaolin-based geopolymer

    Niu, Xiaobo / Elakneswaran, Yogarajah / Islam, Chaerun Raudhatul / Provis, John L. / Sato, Tsutomu

    Journal of hazardous materials. 2022 May 05, v. 429

    2022  

    Abstract: Geopolymers are a class of alkaline-activated materials that have been considered as promising materials for radioactive waste disposal. Currently, metakaolin-based geopolymers (MK-GPs) are attracting interest for the immobilisation of radionuclides in ... ...

    Abstract Geopolymers are a class of alkaline-activated materials that have been considered as promising materials for radioactive waste disposal. Currently, metakaolin-based geopolymers (MK-GPs) are attracting interest for the immobilisation of radionuclides in contaminated water from the Fukushima Daiichi Nuclear Power Station. However, the associated chemical interaction mechanisms and the theoretical prediction of the adsorption behaviour of MK-GP in response to cationic radionuclides have not been thoroughly studied or fully understood. In addition, there is a lack of studies on the adsorption capacity of MK-GP for anionic radionuclides. In this study, two types of metakaolin-based (Metastar501 and Sobueclay) geopolymers were synthesised at a K₂O:SiO₂:H₂O ratio of 1:1:13. The binding capacity and interaction mechanism of MK-GP with Cs⁺, Sr²⁺, Co²⁺, I⁻, IO₃⁻, SeO₃²⁻, and SeO₄²⁻ were evaluated based on the zeta potential, radionuclide binding, and alkali leaching. The results showed that MK-GP does not have the ability to incorporate anionic radionuclides irrespective of the metakaolin source used, but both types of geopolymers have a high capacity to immobilise cationic radionuclides. The uptake of Cs⁺ was observed as a one-to-one exchange between Cs⁺ and K⁺ whereas both one–two and one–one ion exchanges are possible in the case of Sr²⁺ and Co²⁺ with K⁺. The formation of cobalt blue (CoAl₂O₄) also contributed to the binding of Co²⁺. Thermodynamic modelling was conducted according to the ion exchange mechanism which predicts the binding of Cs⁺ and Sr²⁺ at low concentrations.
    Keywords Japan ; adsorption ; ion exchange ; nuclear power ; polymers ; power plants ; prediction ; radioactive waste ; thermodynamics ; waste disposal ; water pollution ; zeta potential
    Language English
    Dates of publication 2022-0505
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 1491302-1
    ISSN 1873-3336 ; 0304-3894
    ISSN (online) 1873-3336
    ISSN 0304-3894
    DOI 10.1016/j.jhazmat.2022.128373
    Database NAL-Catalogue (AGRICOLA)

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