Multi-exponential Inversion of the Relaxometry Data of Low-field Nuclear Magnetic Resonance for Cement-based Materials

IF 1.6 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Journal of Advanced Concrete Technology Pub Date : 2024-01-20 DOI:10.3151/jact.22.33
Xiaoyu Zhang, Chunsheng Zhou, Jing Qiao, Le Li, Lizhi Xiao
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Abstract

Low-field Nuclear Magnetic Resonance (LF-NMR) technique has been attracting increasing concern in nondestructively characterising cement-based materials (CBMs), whose nanoscale pore structure are sensitive to water removal. In order to achieve the multi-exponential inversion of relaxometry data preferred by the interpretation on local pore structure of CBMs, an algorithm incorporating L1 regularisation with capability of yielding sparse solution is developed with the aids of Interior-Point method and various principles for optimising the regularisation parameter. Numerical analyses on representative cases show that, the proposed algorithm equipped with the Morozov discrepancy principle is capable of resolving all artificially designed exponential components of various intensities with satisfactory accuracy and precision, even at relatively low signal-to-noise ratio. When applying to resolve the relaxometry data obtained on a cement paste, the algorithm is good at characterising its pore structure with clear significance and capturing its detailed evolution during curing under hot water with good precision.

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水泥基材料低场核磁共振弛豫测量数据的多指数反演
低场核磁共振(LF-NMR)技术在无损表征水泥基材料(CBMs)方面日益受到关注,因为水泥基材料的纳米级孔隙结构对水的去除非常敏感。为了实现弛豫测量数据的多指数反演,以解释 CBMs 的局部孔隙结构,我们开发了一种结合 L1 正则化的算法,该算法具有生成稀疏解的能力,并借助了内部点法和各种优化正则化参数的原理。对代表性案例的数值分析表明,所提出的算法配备了莫罗佐夫差异原理,即使在信噪比相对较低的情况下,也能以令人满意的精度和准确度解析所有人工设计的各种强度的指数成分。当应用该算法解析水泥浆弛豫测定数据时,该算法能很好地描述水泥浆的孔隙结构,并能准确捕捉其在热水固化过程中的详细演变。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Advanced Concrete Technology
Journal of Advanced Concrete Technology 工程技术-材料科学:综合
CiteScore
3.70
自引率
10.00%
发文量
45
审稿时长
3.5 months
期刊介绍: JACT is fast. Only 5 to 7 months from submission to publishing thanks to electronic file exchange between you, the reviewers and the editors. JACT is high quality. Peer-reviewed by internationally renowned experts who return review comments to ensure the highest possible quality. JACT is transparent. The status of your manuscript from submission to publishing can be viewed on our website, greatly reducing the frustration of being kept in the dark, possibly for over a year in the case of some journals. JACT is cost-effective. Submission and subscription are free of charge . Full-text PDF files are available for the authors to open at their web sites. Scope: *Materials: -Material properties -Fresh concrete -Hardened concrete -High performance concrete -Development of new materials -Fiber reinforcement *Maintenance and Rehabilitation: -Durability and repair -Strengthening/Rehabilitation -LCC for concrete structures -Environmant conscious materials *Structures: -Design and construction of RC and PC Structures -Seismic design -Safety against environmental disasters -Failure mechanism and non-linear analysis/modeling -Composite and mixed structures *Other: -Monitoring -Aesthetics of concrete structures -Other concrete related topics
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