Characterization and Optimization of Polyurethane Based Bituminous Waterproofing Membrane

Now-a-days with the advent in technological advancements, bituminous compositions modified with polymer are being used for numerous applications such as joint filers, adhesives, protective layers, impregnating agents and roofing material The bitumen exhibits a number of mechanical properties but the conventional bitumen doesn’t congregate many requirements because of its drawback of high susceptibility to temperature. Hence from a product design point of view; the most preferred form is modified bitumen. With this aim, a composition in the form of waterproofing product has been developed by modifying bitumen with polyurethane. Polyurethane because of its attractive morphology and wide range of advantageous mechanical properties is a highly promising material having the ability to alter its microstructure to suite niche applications. The developed matrix incorporates the basic useful properties of bitumen along with excellent properties of polyurethane. This modification will maximize the efficiency of product developed in different scenarios making it a resourceful product in terms of waterproofing, insulation properties and enhanced durability. This paper highlights the experimental investigations of physico–mechanical properties of the matrix developed in the form of membrane of varying thickness made from different ratios using different grades of polyurethane and bitumen. Different ratios, grades and thickness of material have been used in trail mixes to attain optimized matrix for the product. The properties such as tensile, elongation, tear, shore hardness, puncture resistance, etc. of membrane developed of various matrixes are examined with relevant ASTM codes. The research work presented here provides an experimental implication for design; development and application of membrane developed for use in engineering purpose.