Study on Crystal Growth of Tobermorite Synthesized by Calcium Silicate Slag and Silica Fume.

Zhijie Yang, Chengyang Fang, Yang Jiao, De Zhang, Dong Kang, Kaiyue Wang

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Article in Materials (Basel, Switzerland), 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.

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1 citing paper in PubMed.

Influence of AlMaterials (Basel, Switzerland) · 2025
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6 authors.

Zhijie YangSchool of Mining and Technology, Inner Mongolia University of Technology, Hohhot 010051, China.ORCID 0000-0001-9091-2799

Chengyang FangSchool of Mining and Technology, Inner Mongolia University of Technology, Hohhot 010051, China.

Yang JiaoSchool of Mining and Technology, Inner Mongolia University of Technology, Hohhot 010051, China.

De ZhangSchool of Mining and Technology, Inner Mongolia University of Technology, Hohhot 010051, China.

Dong KangSchool of Mining and Technology, Inner Mongolia University of Technology, Hohhot 010051, China.

Kaiyue WangSchool of Mining and Technology, Inner Mongolia University of Technology, Hohhot 010051, China.

Funding

Inner Mongolia Autonomous Region Graduate Student Innovation Research Foundation S20210189ZInner Mongolia Autonomous Region Science and Technology Plan Foundation 2020GG0257Inner Mongolia Autonomous Region Science and Technology Plan Foundation 2020GG0287Inner Mongolia Autonomous Region Science and Technology Plan Foundation 2022YFHH0050Inner Mongolia University of Technology 2022109Inner Mongolia University of Technology ZZ201911

6 · The paper itself

Abstract

In order to high-value utilize the secondary solid waste calcium silicate slag (CSS) generated in the process of the extraction of alumina from fly ash, in this paper, tobermorite was synthesized using CSS and silica fume (SF) at different hydrothermal synthesis times. The hydrothermal synthesis was evaluated by means of XRD, SEM, EDS, and micropore analysis, and the results discussed. The results indicate that β-dicalcium silicate, the primary phase in the CSS, partially hydrates at the beginning of hydrothermal synthesis conditions to form mesh-like crystal C-S-H (calcium-rich) and calcium hydroxide. It then reacts with SF to form yarn-like crystal C-S-H (silicon-rich) and then furtherly grows into large flake-like crystal C-S-H (silicon-rich) at 3 h. When the synthesis time is 4 h, β-dicalcium silicate completely hydrates, and crystal C-S-H (calcium-rich) and calcium hydroxide further reacts with large flake-like crystal C-S-H (silicon-rich) to generate medium flake-like tobermorite. With the increase in time, the crystal of hydrothermal synthesis grows in the order of medium flake-like tobermorite, small flake-like tobermorite, strip flake-like tobermorite, fibrous-like tobermorite, and spindle-like tobermorite, and the APV, APD, and SSA show a trend of decreasing first, then increasing, and then decreasing. Meanwhile, strip flake-like tobermorite with a higher average pore volume (APV), average pore diameter (APD), and specific surface area (SSA) can be synthesized at 6 h.

Indexed as

crystal growthC-S-HCSSsynthesis timetobermorite

Identifiers

PMID36770295

DOI10.3390/ma16031288

PMCPMC9919880

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