Quantitative characterization of nano-scale pore structures in a consistent volume of cement paste subjected to heating via synchrotron X-ray nanoimaging

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

Cement and Concrete Research Pub Date : 2024-08-03 DOI:10.1016/j.cemconres.2024.107630

Heongwon Suh, Seongmin Cho, Gyeongryul Kim, Sungchul Bae

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Abstract

Although the mechanism of pore formation in cement paste owing to high temperatures is a critical characteristic directly linked to fire resistance, research regarding the 3D characteristics of nano-scale pores within a consistent volume is limited. This study uses synchrotron X-ray nanoimaging to investigate the impact of heating at various temperatures (400, 600, and 800 °C) on the morphology, distribution, and volume changes of nano-scale pores in a consistent volume of ordinary Portland cement paste. The mechanical and hydration properties were assessed via compressive strength tests, X-ray diffraction, and thermogravimetry. After heating to 400 °C, new high-flatness pores formed, whereas heating to 600 and 800 °C resulted in pore coalescence and the formation blade-like pores developed around unhydrated cement particles. Elongated pores formed after heating to 600 °C, which resulted from the decomposition of Ca(OH)₂, leading to the structure being prone to internal cracking.

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通过同步辐射 X 射线纳米成像定量表征受热水泥浆一致体积中的纳米级孔隙结构

虽然水泥浆在高温下形成孔隙的机理是与耐火性直接相关的关键特征，但有关一致体积内纳米级孔隙的三维特征的研究却很有限。本研究利用同步辐射 X 射线纳米成像技术研究了在不同温度（400、600 和 800 ℃）下加热对一致体积普通硅酸盐水泥浆中纳米级孔隙的形态、分布和体积变化的影响。通过抗压强度测试、X 射线衍射和热重分析评估了其机械和水化性能。加热至 400 ℃ 后，形成了新的高平整度孔隙，而加热至 600 ℃ 和 800 ℃ 则导致孔隙凝聚，并在未水化的水泥颗粒周围形成叶片状孔隙。加热到 600 ℃ 后形成了拉长的孔隙，这是 Ca（OH）分解的结果，导致结构容易内部开裂。

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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.