###### Abstract  
This study analyzed if process oil and synthetic rubber, the main materials of the previous synthetic polymerized rubber gel waterproofing materials (P-SPRG), can be replaced with waste oil and waste rubber to be recycled as raw waterproofing materials as a part of expanding the recycling of waste resources to waterproof areas. The synthetic polymerized rubber gel waterproofing materials (W-SPRG), based on the mixture of waste oil and waste rubber, were primarily analyzed for the trend of viscosity changes according to the mixture ratio between waste oil and waste rubber and were secondarily tested for eight performances, including viscosity, solid content, water permeability resistance, wet surface adhesion, structural behavior responsiveness, underwater loss resistance, chemical resistance safety, and temperature safety. After testing, the viscosity was the highest when the mixture ratio of waste oil and waste rubber was in the range of 2:1, and wet surface adhesion, structural behavior responsiveness, and temperature safety were relatively improved. Moreover, the comparative analysis of performance between W-SPRG and P-SPRG showed that W-SPRG secured the more stable performance in viscosity, solid content, wet surface adhesion, underwater loss resistance, and chemical resistance safety. Based on the results of this study, it has been confirmed that recycled waste oil and waste rubber can be commercialized as raw waterproof materials. This is expected to contribute to improvements in the cost reduction and environmental pollution arising due to waste disposal and incineration.  
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To look at the technical development trends of recycling polymeric waste materials, most are focused on renewable thermoplastics, as highly thermosetting rubber materials are expensive but most of them are incinerated or disposed of due to an irreversible vulcanization treatment [4]. Generally, there are two types of technology to process waste rubber for recycling: (1) the concept of flooring by finely grinding waste rubber, mixing [5] it with a binder, and manufacturing and constructing it as mats, blocks, etc., and (2) collecting and using oil, carbon, etc., contained in rubber through pyrolysis. However, these technologies are not meeting economic and market demands. In the case of waste oil, there is a problem of containing heavy metals such as cadmium, lead, chrome, and arsenic, limitations in jet force due to high viscosity, and the limited range of recycling due to incomplete combustion caused by the high content of ash. The reality is that most of them are recycled into fuel [6] oil through ion refining, vacuum distillation, high-temperature pyrolysis, and other refining methods, [7] which are difficult to be applied to products with various characteristics.  
This study aimed at improving the performance of previous waterproofing materials (P-SPRG) as a part of expanding the viscous semi-solid-type [8] synthetic polymerized rubber gel waterproofing materials (W-SPRG). This is to confirm the waterproof performance from the perspective of waterproof engineering, not polymerization, based on the mixture [9] of waste oil and waste rubber to waterproof areas [10; 11; 12] using the unique features [13] of waste oil and waste rubber and contributing [14] to the economic effects and improvements of environmental problems by recycling waste resources.  
In addition, through this study, by innovatively using waste oil and waste rubber as raw materials for waterproofing materials, it is possible to reduce the use of expensive synthetic rubber and process oil as well as to reduce carbon dioxide emissions and the cost of the incineration and treatment of waste resources. This can be expected to improve environmental problems.