کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1457526 989266 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Scanning electron microscopic investigations of fresh mortars: Well-defined water-filled layers adjacent to sand grains
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی صنعتی و تولید
پیش نمایش صفحه اول مقاله
Scanning electron microscopic investigations of fresh mortars: Well-defined water-filled layers adjacent to sand grains
چکیده انگلیسی

SEM examinations are reported of freshly-mixed and early age mortar specimens prepared by fast freezing in liquid nitrogen followed by epoxy impregnation, and of companion specimens of early aged mortars prepared conventionally. Freshly-mixed mortars reveal complex features that appear to influence subsequent development of the hardened state microstructure. In particular, layers of entirely water-filled space a few micrometers thick are found adjacent to many of the sand grain surfaces. After a few hours sparse deposits of calcium hydroxide crystals (and later C–S–H) are found within these layers, but the layers persist as recognizable features for at least 12 h. The layers are identically recognizable in both fast-frozen and conventionally-prepared specimens. Another feature found in freshly-mixed mortars is the existence of patchy local areas of sparsely-packed and other areas of densely-packed cement particles.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cement and Concrete Research - Volume 38, Issue 4, April 2008, Pages 530–537
نویسندگان
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