Carbonation reactivity of calcium silicate glasses at various calcium to silicate ratios and comparison with wollastonite

IF 10.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Cement and Concrete Research Pub Date : 2024-09-02 DOI:10.1016/j.cemconres.2024.107653

Chen Li , Bo Liu , Qiaomu Zheng , Yi Li , Xinping Zhu , Yuan Fang , Qingxin Zhao , Zhengwu Jiang , Jiaqi Li

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Abstract

Amorphous calcium (alumino) silicates are the main component of industrial byproducts (e.g., blast furnace slag and fly ash) and can be generated by grinding silicate minerals that are abundant in steel slag and carbonated calcium silicate binders. To promote the production of CO₂-activated building material from diverse materials, this study investigated the carbonation of synthetic calcium silicate glasses, model compounds of these amorphous silicates. A dissolution-controlled carbonation mechanism was revealed, in contrast with a nucleation-controlled counterpart for the carbonation of wollastonite, a model compound of silicate minerals. The former mechanism is governed by the number of Q³ species in the silica layers on carbonated particle surfaces serving as sites for ionic exchange. The latter is evidenced by well-aligned CaCO₃ nuclei precipitating on wollastonite particles under high CaCO₃ supersaturation. Overall, high Ca/Si ratios favor carbonation. At Ca/Si = 1, the calcium silicate glass shows faster carbonation kinetics than wollastonite at early ages.

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不同钙硅比硅酸钙玻璃的碳化反应性以及与硅灰石的比较

无定形钙（铝）硅酸盐是工业副产品（如高炉渣和粉煤灰）的主要成分，可通过研磨钢渣和碳化硅酸钙粘合剂中丰富的硅酸盐矿物生成。为了促进利用各种材料生产二氧化碳活性建筑材料，本研究调查了这些无定形硅酸盐的模型化合物--合成硅酸钙玻璃的碳化过程。研究揭示了一种溶解控制碳化机制，与硅酸盐矿物模型化合物硅灰石的成核控制碳化机制形成鲜明对比。前一种机制受制于碳化颗粒表面作为离子交换场所的二氧化硅层中 Q3 物种的数量。后者的证据是，在 CaCO3 过饱和度较高的情况下，硅灰石颗粒上沉淀出排列整齐的 CaCO3 核。总的来说，高 Ca/Si 比有利于碳化。当 Ca/Si = 1 时，硅酸钙玻璃在早期年龄段比硅灰石显示出更快的碳化动力学。

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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.