Sintering behaviour and structure-thermal stability relationships of alkali-doped ternesite

IF 10.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2023-02-01 DOI:10.1016/j.cemconres.2022.107043

Lei Liu , Wensheng Zhang , Xuehong Ren , Jiayuan Ye , Jiangtao Zhang , Zhongtao Luo , Jueshi Qian

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引用次数: 0

Abstract

The present study aims to address how alkali metal dopants affect (i) chemical reactions during sintering, (ii) phase assemblage and microstructure of resulting samples, (iii) structure and thermal stability of formed ternesite (C₅S₂ $\bar{S}$ ) crystals during the synthesis of ternesite. Our results show that the formation of C₅S₂ $\bar{S}$ was significantly facilitated by the addition of alkali metal dopants due to the fluxing effect of alkali bearing liquid phases. However, these alkali metal ions could be preferentially hosted by intermediate silicate phases, such as C₂S, and caused the stabilization of these phases, thus indirectly affecting the final C₅S₂ $\bar{S}$ content. Li⁺ ions tended to occupy Ca sites and interstitial sites in ternesite lattices, stabilizing a rounded polyhedral habit of ternesite crystals. While the incorporation of Na⁺ and K⁺ ions was attributed to the monotonous Ca substitution and induced a nodule like morphology of ternesite crystals. Also a correlation between the structural modification of ternesite induced by the alkali metals doping and its thermal stability evolution was established.

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碱掺杂铁镁石的烧结行为和结构-热稳定性关系

本研究旨在解决碱金属掺杂如何影响(i)烧结过程中的化学反应，(ii)所得样品的相组合和微观结构，(iii)形成的铁氏体(C5S2S¯)晶体在铁氏体合成过程中的结构和热稳定性。结果表明，由于含碱液相的助熔剂作用，添加碱金属掺杂剂可显著促进C5S2S¯的形成。然而，这些碱金属离子可以优先被中间硅酸盐相(如C2S)所承载，并引起这些相的稳定，从而间接影响最终的C5S2S¯含量。Li+离子倾向于占据晶格中的Ca位点和间隙位点，稳定了晶格的圆角多面体习性。而Na+和K+离子的掺入则是由于钙离子的单一取代，导致钛钙石晶体形成结节状形态。此外，还建立了碱金属掺杂引起的铁氏体结构改性与其热稳定性演变之间的关系。

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来源期刊

Cement and Concrete Research 工程技术-材料科学：综合

CiteScore

20.90

自引率

12.30%

发文量

318

审稿时长

53 days

期刊介绍： Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.