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Quantitative backscattered electron analysis of cement paste

✍ Scribed by Hong Zhao; David Darwin

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
884 KB
Volume
22
Category
Article
ISSN
0008-8846

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✦ Synopsis

Procedures are developed to obtain reproducible quantitative data from polished specimens of cement paste using automated backscattered electron imaging. Signal production, contrast, image resolution, and imaging techniques are discussed. Preparation of a silicon-magnesium standard is described. Typical results and a statistical basis for establishing the number of frames required to provide confidence in the results are presented. The silicon-magnesium standard provides an objective method for setting both a scanning electron microscope and an image analysis system for quantitative backscattered electron analysis of phases within cement paste. The number of frames required for a selected degree of confidence decreases, but the total area required increases as magnification decreases. The number of frames is also a function of the specific phase, being greatest for unhydrated cement particles and least for inner product and calcium silicate hydrate.

📜 SIMILAR VOLUMES

A reply to a discussion by D. Bonen of t
A reply to a discussion by D. Bonen of the paper “quantitative backscattered electron analysis of cement paste”
✍ Hong Zhao; David Darwin 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 276 KB

The authors appreciate Bonen's discussion. He has raised a number of useful points that should be addressed. At the outset, it appears that Bonen has concluded that the preset gray levels used to identify phases within cement paste were selected based on "absolute" backscatter coefficients. This wa

A comment on the reply to the discussion
A comment on the reply to the discussion of the paper “quantitative backscattered electron analysis of cement paste” by H. Zhao and D. Darwin
✍ David Bonen 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 157 KB

The writer thanks Zhao and Darwin for their thoughtful reply, shedding more light on the complexity of backscatter image processing. The writer takes this opportunity to comment on their reply and addresses some fundamental issues.

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The microstructure of cement pastes containing 5% silica fume or 30% ground granulated blast furnace slag was investigated in comparison with plain portland cement pastes. The pastes were cured at constant temperatures of 23°C and 70°C to degrees of hydration of 30 and 70% as indicated by the noneva