Plugging effect of fine pore water in OPC and LC3 paste during accelerated carbonation monitored via single-sided nuclear magnetic resonance spectroscopy

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

Cement and Concrete Research Pub Date : 2024-10-08 DOI:10.1016/j.cemconres.2024.107688

Luge Cheng , Ryo Kurihara , Takahiro Ohkubo , Ryoma Kitagaki , Atsushi Teramoto , Yuya Suda , Ippei Maruyama

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引用次数: 0

Abstract

This study investigates the influence of CO₂ concentration on the carbonation process in cementitious paste, focusing on water content distribution in ordinary Portlandite cement and limestone-calcined clay cement (LC³). Employing single-sided nuclear magnetic resonance spectroscopy for water profiling, we revealed that under accelerated carbonation of 5 % and 1 %, the water content in fine pores (interlayer space and gel pores) kept constant at the carbonation front, demonstrating the plugging effect where fine pore water removal governs carbonation progress. This effect was absent under natural carbonation conditions because evaporation precedes the carbonation process. This study emphasizes that to accurately characterize cementitious materials under natural carbonation conditions, CO₂ concentrations in accelerated methods should be constrained to prevent the plugging effect.

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通过单面核磁共振波谱监测加速碳化过程中 OPC 和 LC3 浆料中细小孔隙水的堵塞效应

本研究探讨了二氧化碳浓度对水泥基浆料碳化过程的影响，重点研究了普通硅酸盐水泥和石灰岩煅烧粘土水泥（LC3）中的含水率分布。利用单面核磁共振波谱进行水剖面分析，我们发现在 5 % 和 1 % 的加速碳化条件下，碳化前沿细孔（层间空间和凝胶孔）中的含水量保持恒定，这表明了细孔脱水主导碳化进程的堵塞效应。在自然碳化条件下不存在这种效应，因为蒸发先于碳化过程。本研究强调，要准确表征自然碳化条件下胶凝材料的特性，应限制加速方法中的二氧化碳浓度，以防止堵塞效应。

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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.