A test method for determining adhesion forces and Hamaker constants of cementitious materials using atomic force microscopy

Journal Article · Tue Nov 15 00:00:00 EST 2011 · Cement and Concrete Research

DOI:https://doi.org/10.1016/j.cemconres.2011.07.004· OSTI ID:21576900

Lomboy, Gilson ^[1]; Sundararajan, Sriram ^[2]; Kejin, Wang ^[1]; Subramaniam, Shankar ^[2]

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1. Department of Civil, Construction, and Environmental Engineering, Iowa State University, Ames, Iowa 50011 (United States)
2. Department of Mechanical Engineering, Iowa State University, Ames, Iowa 50011 (United States)

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 C{sub 3}S, which is attributed to short hydration time ({<=} 45 min) used in this study.

• OSTI ID: 21576900
• Journal Information: Cement and Concrete Research, Vol. 41, Issue 11; Other Information: DOI: 10.1016/j.cemconres.2011.07.004; PII: S0008-8846(11)00195-5; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0008-8846
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ADHESION
ATOMIC FORCE MICROSCOPY
BLAST FURNACES
HYDRATION
MICA
PORTLAND CEMENT
SAMPLE PREPARATION
SILICA
SILICON NITRIDES
BUILDING MATERIALS
CEMENTS
FURNACES
MATERIALS
MICROSCOPY
MINERALS
NITRIDES
NITROGEN COMPOUNDS
OXIDE MINERALS
PNICTIDES
SILICATE MINERALS
SILICON COMPOUNDS
SOLVATION