کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1455582 989055 2008 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The morphology of entrained air voids in hardened cement paste generated with different anionic surfactants
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی صنعتی و تولید
پیش نمایش صفحه اول مقاله
The morphology of entrained air voids in hardened cement paste generated with different anionic surfactants
چکیده انگلیسی

The surface structures of entrained air voids in hardened cement paste were examined by means of an environmental scanning electron microscope (ESEM). Three different pure anionic surfactants were used: sodium dodecyl sulfonate (SDS), sodium dodecyl-benzene sulfonate (SDBS), and sodium oleate (SO). It was observed that a distinct shell forms around most of the entrained air voids regardless of the surfactant used. It was also shown that some hydration products can grow into the air voids at very early ages and may fill considerable amount of the void volume. In addition to the microscopic evaluation, a modified foam index test and surface tension measurements were also conducted on the solutions with different mixtures. It was determined that since oleate molecules coming from SO were precipitated in the mix as calcium oleate, exiguous amount of air bubbles were stabilized in the paste; however, when SDS and SDBS were used, an acceptable amount of air bubbles were stabilized.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cement and Concrete Composites - Volume 30, Issue 7, August 2008, Pages 566–575
نویسندگان
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