By Donald H. Campbell

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Additional resources for Microscopical Examination and Interpretation of Portland Cement and Clinker

Example text

3. After cleaning the polished surface with isopropyl alcohol in the sonic cleaner, the section is dried with forced warm air and is ready for study in reflected light. 03-µm alumina and Texmet™. Suitably polished and etched surfaces can be examined with a scanning electron microscope. Drafting linen, washed to remove the starch, can be successfully used as a polishing cloth with SnO2 or other polishing compounds. Diamond pastes or aerosol sprays are applicable in all the grinding and polishing steps and are highly recommended.

Alite from stable growth is characterized by scarce inclusions, low impurity concentrations (aluminum and iron), M3 dominant, regular faceted morphology, and low defect concentration. Alite representing unstable growth conditions has abundant inclusions, high impurity concentrations, M1 dominating, an irregular morphology, and high defect concentration. In the industrial clinkering process, both types of alite are seen commonly in the same crystal—an earlier formed, irregular M1 core over which zoned, well faceted crystal growth is developed.

This writer has had excellent results using techniques somewhat similar to those of Harris (1984) for producing polished sections of small whole clinkers (pea size), crushed clinkers (1 to 2 mm), or cements. The technique, using epoxy instead of Super Glue™, is as follows: 1. 2. 3. 4. Harris’s Technique 5. A quick technique using Duro Super Glue™ (containing a cyanoacrylate ester), or equivalent, has been described by Roy Harris (1984) of The Monarch Cement Company, Humboldt, Kansas. With Harris’s method 24 Place 15 to 20 small clinkers or clinker fragments in freshly mixed epoxy resin with hardener and vacuum impregnate.

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