{"title":"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","authors":"","doi":"10.1016/j.cemconres.2024.107630","DOIUrl":null,"url":null,"abstract":"<div><p>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)<sub>2</sub>, leading to the structure being prone to internal cracking.</p></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":null,"pages":null},"PeriodicalIF":10.9000,"publicationDate":"2024-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Quantitative characterization of nano-scale pore structures in a consistent volume of cement paste subjected to heating via synchrotron X-ray nanoimaging\",\"authors\":\"\",\"doi\":\"10.1016/j.cemconres.2024.107630\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>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)<sub>2</sub>, leading to the structure being prone to internal cracking.</p></div>\",\"PeriodicalId\":266,\"journal\":{\"name\":\"Cement and Concrete Research\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":10.9000,\"publicationDate\":\"2024-08-03\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Cement and Concrete Research\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0008884624002114\",\"RegionNum\":1,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CONSTRUCTION & BUILDING TECHNOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Cement and Concrete Research","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0008884624002114","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}
Quantitative characterization of nano-scale pore structures in a consistent volume of cement paste subjected to heating via synchrotron X-ray nanoimaging
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.
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.
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