Evaluation of Adhesive-Bond Quality in Telephone Crossarms after 16 to 23 Years of Exterior Exposure

摘要

Telephone crossarms, differing in species, adhesive type, and preservative treatment, were tested for adhesive bond quality after field exposure. The results in six of the seven groups were considered to be quite good. The seventh group had been bonded with a urea resin, and, although bond strength was highly variable, the average strength was higher than would normally be expected. The reason for the unexpected results with urea was felt to be the water-repellent effect of the preservative treatment used. (Author)