Bethesda Terrace, Central Park
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Laboratory testing for Minton tile repair and coating options

ICR conducted laboratory testing to help determine patch compounds and coatings for the repair and replacement of the Minton tiles in the ceiling.

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Laboratory Testing for Minton Tile Repair
• Design and execution of laboratory testing program on
   composite tile repairs
• Design and execution of laboratory testing program on
   replacement tile coatings

ICR designed laboratory testing programs first in 1998 and then in 2005 to address repairs for the Minton tiles at Bethesda Terrace. The first round of testing investigated the performance of potential composite repairs for the tiles – two cementitious mortars and two epoxy-based materials incorporated into broken pieces of the Minton tiles – coated with both inorganic- and acrylic-based coatings. The test panels were subjected to accelerated testing by QUV-Spray and freeze-thaw cycles and evaluated visually for any changes including water repellency by water drop test.

The second round of testing researched coating performance on epoxy-based composite repairs after accelerated testing in a QUV-Spray machine. The results were evaluated by adhesion of the coating to the substrate through tape test and color change by spectrophotometry, conducted before and after accelerated testing.