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  • Published Date
Displaying 1901 - 1925 of 3904

Scanning Electron Microscopy Imaging of Hydraulic Cement Microstructure

November 1, 2004
Author(s)
Paul E. Stutzman
Microscopy of portland cement clinker and cementitous materials dates to the first petrographic microscope in the late 19th century. The development of the scanning electron microscope (SEM) with x-ray microanalysis allows the petrographer to study cements

Virtual Permeametry on Microtomographic Images

November 1, 2004
Author(s)
C H. Arns, M A. Knackstedt, W V. Pinczewski, Nicos Martys
We show that accurate numerical micropermeametry measurements can be performed on three dimensional digitized images of sedimentary rock. The sample size can be very small making it possible to predict properties from core material not suited for

Validation of the Receprocity Law for Coating Photodegradation

October 20, 2004
Author(s)
Joannie W. Chin, Tinh Nguyen, Jonathan W. Martin, E Byrd
Accelerating the photodegradation of commerical polymeric materials has great practical importance in the weathering community. However, questions exist as to whether high radiant flux exposure results cn be extrapolated to in-service exposure levels

Station Nightclub Fire Investigation Status Report.

October 19, 2004
Author(s)
William L. Grosshandler
National Construction Safety Team (NCST) Advisory Committee Meeting, Presentation: The Station Nightclub Fire Investigation Status Report, October 20, 2004

Relating Gloss Loss to Topographical Features of a PVDF Coating

October 6, 2004
Author(s)
J Faucheu, Li Piin Sung, K Wood, Jonathan W. Martin
Semi-gloss commercial poly(vinylidene fluoride) (PVDF) coatings typically have 60o gloss values between 20 and 50. Gloss is affected by PVDF crystallite structures and by the pigmentation. In this paper, we have demonstrated that for some pigmented PVDF

Building Stones of America: 50 Years of the NIST Stone Test Wall

October 1, 2004
Author(s)
Paul E. Stutzman, J Raz
In 1880 the Census Office and the National Museum in Washington, DC conducted a study of building stones of the United States and collected a set of reference specimens from working quarries. This collection was merged with the Centennial Collection of US
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