Comparisons of Silicone and Urethane Sealant Durabilities
Publication: Journal of Materials in Civil Engineering
Volume 3, Issue 4
Abstract
A two‐year aging study was presented for four sealants: a low‐modulus silicone, a medium‐modulus silicone, a one‐part polyurethane, and a two‐part polyurethane. A specimen, with red granite substrates, is used. The four aging exposures are: ordinary room conditions; outdoors in Houghton, Michigan; outdoors near Hilo, Hawaii; and aging in a Q‐Panel (QUV) weathering unit. Following an initial six‐week cure, room‐ and outdoor‐aged specimens are tested at zero‐, six‐, 12‐, and 24‐month intervals. The QUV‐aged specimens are tested after 0, 500, 1,000, and 5,000 hours. In the postaging tests, specimens are given 20 displacement cycles at the sealant's rated movement capacity and elongated to failure. Reported data include nominal stresses at 25%, 50%, and 100% elongation, the ultimate tensile strength, and the corresponding elongation. Additionally, observations are given for surface cracking and dirt pickup. Adhesion to the substrates is good for all four sealants. Results of a pilot study combining QUV exposure with a displacement cycle are also reported. The overall findings indicate that the silicones' performance is superior to that of the urethanes.
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References
1.
Fedor, G., and Brennan, P. (1990). “Correlation of accelerated and natural weathering of sealants.” Adhesives Age, 33(5), 22–27.
2.
“Standard test method for adhesion and cohesion of elastomeric joint sealants under cyclic movement (Hockman cycle).” (1989a). ASTM C 719‐86, 04.07, ASTM, Philadelphia, Pa.
3.
“Standard test method for effects of accelerated weathering on elastomeric joint sealants.” (1989b). ASTM C 793‐75(86), 04.07, ASTM, Philadelphia, Pa.
4.
“Standard test method for indentation hardness of elastomeric‐type sealants by means of a durometer.” (1989c). ASTM C 661‐86, 04.07, ASTM, Philadelphia, Pa.
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Copyright © 1991 ASCE.
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Published online: Nov 1, 1991
Published in print: Nov 1991
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