Research Associate Marissa Bartz drilling a core sample in a test wall.

This technique is used to take core samples for testing the concentrations of salt in a structure.  It was adapted from the method and toolkit developed by Mesilla Valley Preservation, Inc.  The major difference is the use of a hammer drill to help with taking a core sample from a harder material.

The hammer drill coring technique was used to collect samples from test walls treated with different anti-efflorescence coatings.  The salinity data collected from the samples was used to determine the effectiveness of different anti-efflorescence coating products.  Research Associates Elle Farias, Silvia Lob, and Marissa Bartz wrote blog posts throughout the project which can be found in order at the following links.  1: construction, 2: experiment and treatment, 3: efflorescence observations, 4: water absorption, and 5: driving rain experiment.

The salinity data are reported in grams of salt per gram of brick.  Depending on how many samples are analyzed, it is possible to graph the data to show variability of salt content throughout a wall or structure.

Salinity measurements for a test wall in graphical form.

 

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National Center for Preservation Technology and Training
645 University Parkway
Natchitoches, LA 71457

Email: ncptt[at]nps.gov
Phone: (318) 356-7444
Fax: (318) 356-9119