Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Recycling the waste dolomite powder with excellent consolidation properties: Sample synthesis, mechanical evaluation, and consolidation mechanism analysis
https://orcid.org/0000-0002-7116-7831
https://orcid.org/0000-0002-6576-8200
Graphic abstract Display Omitted
Highlights High strength & heat-resisting dolomite-based cementitious material prepared. Different from silicate-based alkali-activated materials. Well crystallized and dispersed whiskers were obtained. A new green consolidation mechanism for powdered-materials was proposed.
Abstract Alkali activation has gradually become an important means to treat solid waste and produce green cementitious materials. The alkali-activated samples were successfully prepared by waste dolomite powder, whose consolidated-performance and environmental friendliness are both excellent. This work intensively investigates the preparation process and thermo-mechanical properties of alkali-activated waste dolomite powder, and emphatically analyses the consolidation mechanism, which is distinct from that of silicate alkali-activated materials. The optimal preparation parameters were found as follows: alkali concentration (1.5 wt%), compression molding pressure (125 MPa), curing temperature (could be from 22 to 150 °C), and holding time (2 h); under these preparation parameters, the corresponding samples’ compressive strength could reach a level between 67.77 MPa and 73.75 MPa. And its heat-resistance temperature is at least 400 °C, which is higher than that of Ordinary Portland Cement. Via the characterization analysis including TG-DTA, FTIR, XRD, SEM, and EDS, two-part mechanisms were suggested that may support this performance: the consolidation mechanism at room temperature (22 °C) was considered to involve two kinds of chemical reactions that were dedolomitization and ion cross-linking, and the thermal reaction was believed to contain the decomposition of magnesite and then of calcite. These results exhibit the alkali-activated waste dolomite powder has excellent mechanical properties and heat-resistance temperature, which not only provides an efficient, green path for waste dolomite powder handing but also renders a novel idea in the alkali-activated system based on dolomite.
Recycling the waste dolomite powder with excellent consolidation properties: Sample synthesis, mechanical evaluation, and consolidation mechanism analysis
https://orcid.org/0000-0002-7116-7831
https://orcid.org/0000-0002-6576-8200
Graphic abstract Display Omitted
Highlights High strength & heat-resisting dolomite-based cementitious material prepared. Different from silicate-based alkali-activated materials. Well crystallized and dispersed whiskers were obtained. A new green consolidation mechanism for powdered-materials was proposed.
Abstract Alkali activation has gradually become an important means to treat solid waste and produce green cementitious materials. The alkali-activated samples were successfully prepared by waste dolomite powder, whose consolidated-performance and environmental friendliness are both excellent. This work intensively investigates the preparation process and thermo-mechanical properties of alkali-activated waste dolomite powder, and emphatically analyses the consolidation mechanism, which is distinct from that of silicate alkali-activated materials. The optimal preparation parameters were found as follows: alkali concentration (1.5 wt%), compression molding pressure (125 MPa), curing temperature (could be from 22 to 150 °C), and holding time (2 h); under these preparation parameters, the corresponding samples’ compressive strength could reach a level between 67.77 MPa and 73.75 MPa. And its heat-resistance temperature is at least 400 °C, which is higher than that of Ordinary Portland Cement. Via the characterization analysis including TG-DTA, FTIR, XRD, SEM, and EDS, two-part mechanisms were suggested that may support this performance: the consolidation mechanism at room temperature (22 °C) was considered to involve two kinds of chemical reactions that were dedolomitization and ion cross-linking, and the thermal reaction was believed to contain the decomposition of magnesite and then of calcite. These results exhibit the alkali-activated waste dolomite powder has excellent mechanical properties and heat-resistance temperature, which not only provides an efficient, green path for waste dolomite powder handing but also renders a novel idea in the alkali-activated system based on dolomite.
Recycling the waste dolomite powder with excellent consolidation properties: Sample synthesis, mechanical evaluation, and consolidation mechanism analysis
https://orcid.org/0000-0002-7116-7831
https://orcid.org/0000-0002-6576-8200
Graphic abstract Display Omitted
Highlights High strength & heat-resisting dolomite-based cementitious material prepared. Different from silicate-based alkali-activated materials. Well crystallized and dispersed whiskers were obtained. A new green consolidation mechanism for powdered-materials was proposed.
Abstract Alkali activation has gradually become an important means to treat solid waste and produce green cementitious materials. The alkali-activated samples were successfully prepared by waste dolomite powder, whose consolidated-performance and environmental friendliness are both excellent. This work intensively investigates the preparation process and thermo-mechanical properties of alkali-activated waste dolomite powder, and emphatically analyses the consolidation mechanism, which is distinct from that of silicate alkali-activated materials. The optimal preparation parameters were found as follows: alkali concentration (1.5 wt%), compression molding pressure (125 MPa), curing temperature (could be from 22 to 150 °C), and holding time (2 h); under these preparation parameters, the corresponding samples’ compressive strength could reach a level between 67.77 MPa and 73.75 MPa. And its heat-resistance temperature is at least 400 °C, which is higher than that of Ordinary Portland Cement. Via the characterization analysis including TG-DTA, FTIR, XRD, SEM, and EDS, two-part mechanisms were suggested that may support this performance: the consolidation mechanism at room temperature (22 °C) was considered to involve two kinds of chemical reactions that were dedolomitization and ion cross-linking, and the thermal reaction was believed to contain the decomposition of magnesite and then of calcite. These results exhibit the alkali-activated waste dolomite powder has excellent mechanical properties and heat-resistance temperature, which not only provides an efficient, green path for waste dolomite powder handing but also renders a novel idea in the alkali-activated system based on dolomite.
Recycling the waste dolomite powder with excellent consolidation properties: Sample synthesis, mechanical evaluation, and consolidation mechanism analysis
Lin, Weiqing (Autor:in) / Zhou, Fangyuan (Autor:in) / Luo, Wenjun (Autor:in) / You, Lingyun (Autor:in)
26.03.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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