Phase Identification in Cement Paste by Modulus Mapping

doi:10.11901/1005.3093.2015.468

Chinese Journal of Materials Research

2016, Vol. 30

Issue (5): 321-328 DOI: 10.11901/1005.3093.2015.468

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Phase Identification in Cement Paste by Modulus Mapping

GAO Xiang^1,², WEI Ya^1,^**(

), HUANG Wei²

1. Key Laboratory of Civil Engineering Safety of Durability of China Education Ministry, Department of Civil Engineering, Tsinghua University, Beijing 100084, China
2. Ministry of Education ITS Engineering Research Center, Southeast University, Nanjing 210096, China

Cite this article:

GAO Xiang, WEI Ya, HUANG Wei. Phase Identification in Cement Paste by Modulus Mapping. Chinese Journal of Materials Research, 2016, 30(5): 321-328.

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Abstract

Phases in cement paste can be identified in micro scale by dynamic mechanical analysis (DMA) based modulus mapping owing to the characteristics of this technique: rapid, precise, high resolution and non-destructive. According to the storage modulus mapping which reflects the differences of elastic properties, the unhydrated clinker, as well as the high density calcium silicate hydrate (CSH) gel and low density CSH gel, which surrounded the clinker can be recognized with the assistance of morphology observation, components analysis and in-situ static indentation etc. Results show that the chemical composition of HD CSH and LD CSH is the same, while their storage modulus are 36GPa and 24GPa respectively, and the phase identification can be accomplished by taking the individual storage modulus into account. Therefore, blindness and repetition in traditional experiments can be avoided by employing the method of DMA-based modulus mapping, and then the properties of interested phase can be acquired with targeted approach.

Key words: inorganic non-metallic materials cement paste dynamic mechanical analysis modulus mapping phase identification CSH gel storage modulus

Received: 20 August 2015

ZTFLH:

TB321

Fund: *Supported by National Natural Science Foundation of China No.51578316

About author: **To whom correspondence should be addressed, Tel: (010) 62771646, E-mail: yawei@tsinghua.edu.cn

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Fig.1 Schematic of dynamical mode

Fig.2 Typical loading curve

Table 1 Chemical composition of raw materials (%, mass fraction)

Fig.3 AFM image of surface roughness

Fig.4 Target test area and its modulus mapping, topography and 3D photo, (a) modulus mapping, (b) topography, (c) 3D photo

Fig.5 Images of storage modulus at specific cross sections, (a) schematic of specific cross sections, (b) storage modulus at line 1, (c) storage modulus at line 2, (d) storage modulus at line 3, (e) storage modulus at line 4

Table 2 Storage modulus of two different phases in cross sections

Fig.6 Schematic of EDS/NI experiments on target area and its topography, (a) SEM photo of indentaion area, (b) AFM photo of indentation area, (c) location of EDS/NI experiments and schematic of different phase

Fig.7 Mechanical parameters determined by nanoindentation and comparison between storage modulus and indentation modulus

Fig.8 Percentage of major elements in different phase

Fig.9 Calcium to Silicon ratio of different phase

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