Abstract
In our previous report, it was pointed out that the conventional adhesion test was not an apropriate method to monitor the adhesion strength of resin lined to concrete when comparing with the real cases in the field where the resin lining was peeled off from concrete.
In this report, the peeling phenomenon of the resin lining was observed and its mechanism was examined on the basis that the peeling of resin was initiated and promoted by the permeating pressure of water from concrete. Finally two test methods, flexural test (center point loading) and peeling test (90°) were studied as the candidates for a new test method to monitor the adhesion strength of resin lining.
Although one case of resin peeling which was not detected by the conventional adhesion test was detected by the flexural test, it appeared to be not so accurate. In case of the peeling test, it was assured that the resin which had the conventional adhesion force of ten to several tens of kgf/cm2 was peeled off by the force of less than several kgf/cm, and the peeling strength was fairly affected by W/C of mortar. Therefore, this peeling test (90°) might be a good new test method for the purpose.
