کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1456832 989226 2011 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A test method for determining adhesion forces and Hamaker constants of cementitious materials using atomic force microscopy
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی صنعتی و تولید
پیش نمایش صفحه اول مقاله
A test method for determining adhesion forces and Hamaker constants of cementitious materials using atomic force microscopy
چکیده انگلیسی

A method for determining Hamaker constant of cementitious materials is presented. The method involved sample preparation, measurement of adhesion force between the tested material and a silicon nitride probe using atomic force microscopy in dry air and in water, and calculating the Hamaker constant using appropriate contact mechanics models. The work of adhesion and Hamaker constant were computed from the pull-off forces using the Johnson–Kendall–Roberts and Derjagin–Muller–Toropov models. Reference materials with known Hamaker constants (mica, silica, calcite) and commercially available cementitious materials (Portland cement (PC), ground granulated blast furnace slag (GGBFS)) were studied. The Hamaker constants of the reference materials obtained are consistent with those published by previous researchers. The results indicate that PC has a higher Hamaker constant than GGBFS. The Hamaker constant of PC in water is close to the previously predicted value C3S, which is attributed to short hydration time (≤ 45 min) used in this study.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cement and Concrete Research - Volume 41, Issue 11, November 2011, Pages 1157–1166
نویسندگان
, , , ,