Phase profiling of carbonation-cured calcium sulfoaluminate cement

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

Cement and Concrete Research Pub Date : 2024-12-30 DOI:10.1016/j.cemconres.2024.107776

Jihoon Park , Joonho Seo , Solmoi Park , Alam Cho , H.K. Lee

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Abstract

The present study investigated the effect of CO₂ concentration during carbonation curing on the microstructural evolution of calcium sulfoaluminate (CSA) cement. Carbonation curing was performed for 28 d at 3 % and 10 % CO₂ concentrations. To profile the microstructure, samples were collected from the surface of the cement to a depth of 30 mm on set curing days. At 3 % CO₂ concentration, vaterite and aragonite predominated, and calcite was generated from the recrystallization of vaterite. At 10 % CO₂ concentration, the formation of aragonite was mainly observed, with distinct phase transition from vaterite to aragonite during curing. The delayed CO₂ penetration rate with an increasing depth from the surface led to an increase in the content of calcite and aragonite at 3 % and 10 % CO₂ concentrations, respectively. The phase assemblages of carbonation-cured CSA cement were thermodynamically predicted and compared with the experimental data to elucidate the microstructural evolution beyond the testing timeframe.

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碳化固化硫铝酸钙水泥的物相分析

研究了碳化固化过程中CO2浓度对硫铝酸钙（CSA）水泥微观结构演变的影响。在3%和10%的CO2浓度下进行28 d的碳化固化。为了描绘微观结构，在固定的养护天数内，从水泥表面收集30 mm深度的样品。在3% CO2浓度下，以水晶石和文石为主，水晶石再结晶生成方解石。在10% CO2浓度下，主要观察到文石的形成，在养护过程中有明显的从水晶石到文石的相变。当CO2浓度分别为3%和10%时，随着距离地表深度的增加，CO2渗透速率的延迟导致方解石和文石含量的增加。对碳化固化CSA水泥的相组合进行了热力学预测，并与实验数据进行了对比，以阐明碳化固化后CSA水泥的微观结构演变。

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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.