Title: Tests of Paper Molds for Concrete Cylinders
Author(s): Robert A. Burmeister
Publication: Journal Proceedings
Appears on pages(s): 17-24
Keywords: no keywords
Concrete test cylinders cast in a new type paper mold had a compressive strength lower than that predicted for the concrete mix used. Investigation showed that cracks and mechanical injuries to the outer shell of the concrete cylinder caused by movement of the paper stock during the first 24 hours of curing reduced the strength of the cylinder. To a lesser degree this was true also of the paraffined paper molds in common use for casting test cylinders, specimens cast in both types of paper molds showing lower strengths than test cylinders from the same mix cast in steel molds.