Comparison of three different deconvolution methods for analyzing nanoindentation test data of hydrated cement paste

Zhang, Zhen; Qin, Jiankun; Ma, Zhaoyang; Pang, Xueyu; Zhou, Yongle

doi:10.1016/j.cemconcomp.2023.104990

Cited by 10 publications

(2 citation statements)

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“…The Gaussian mixture model (GMM) based on MLE method is a commonly used method of statistical nanoindentation technique in composite materials [7,10], which takes elastic modulus and hardness as the essential properties and simultaneously considers modulus and hardness in the deconvolution calculation process. The deconvolution process of the GMM and CDF in this study was consistent with that used in [14].…”

Section: Methodsmentioning

confidence: 68%

“…Combined with XRD and MIP analysis, there were 5 phases with varying mechanical properties in hydrated cement paste, including microscopic (MP), LD C-S-H, HD C-S-H, calcium hydroxide (CH), and anhydrate cement particles (CP). The ultra-high-density C-S-H was not divided in this study, which may be caused by the difference in the curing conditions of sample [14]. Fig.…”

Section: Results and Analysismentioning

confidence: 91%

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Impacts of Abnormal Nanoindentation Points on Micromechanical Properties and Content of Phase in Hydrated Cement Paste

Zhang,

Pang,

et al. 2023

KEM

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During nanoindentation analysis of cementitious materials, data points with abnormal load-depth curves are often obtained. This study investigates the effect of these abnormal indentation points (AIP) on the micromechanical properties and content of phase in hydrated cement paste calculated by nanoindentation test combined with deconvolution analysis, including the least-square-estimation (LSE) and maximum-likelihood-estimation (MLE) methods. The results indicate that the AIP is mostly associated with phases with low mechanical properties, and the exclusion of AIP significantly affects the volume fractions of micropore phase and low-density calcium silicate hydrate, while the mechanical properties of phases keep stable except that the mechanical properties of micropore phase are slightly increased by the exclusion of the AIP. The phase contents derived based on LSE showed a more significant change than those derived based on the MLE when AIP was excluded from indentation data. In addition, the phase content derived by nanoindentation analysis was compared to that derived by other analysis methods, including mercury intrusion and quantitative x-ray diffraction.

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Section: Methodsmentioning

confidence: 68%

Section: Results and Analysismentioning

confidence: 91%