Evaluation of Adhesion Characteristics According to Chemical Deterioration Conditions and Recycled Material Content of Butyl Rubber Compound Waterproof Sheet

This study sought to investigate the adhesion strength reduction of reclaimed butyl rubber self-adhesive waterproofing sheets after exposure to a chemical erosion environment. Ranges from 0 to 45% mixture ratio (with changing intervals of 5% ratio) of reclaimed butyl rubber replaced the new rubber content of commercial butyl rubber self-adhesive waterproofing sheets for testing, based on the optimal results for the reclaimed butyl rubber content in order to ensure performance that meets the standard criteria. The research results confirmed that performance degradation was relatively greater when exposed to an acidic environment that was responsible for chemical deterioration. It was also confirmed that, given the deterioration environment described above, the reclaimed butyl rubber content should be limited to 44% so as to ensure an adhesion performance similar to that of the untreated test sample (reclaimed butyl rubber content of 67%). Based on the above results, it was suggested that the optimal mixing range of reclaimed butyl rubber should be up to 44% of the total rubber content, considering performance degradation after field application in the production of self-adhesive waterproofing sheets.