## 1 Introduction  
In general, sheet-type waterproofing materials are commonly applied to the vertical surfaces of concrete structures. To ensure the continuous performance of sheet-type waterproofing materials, it is crucial to maintain the long-term adhesion between the substrate and the waterproofing material [1, 2]. Consequently, many countries have established quality standards for adhesion strength in sheet-type waterproofing materials to manage their performance. The adhesion strength management of sheet waterproofing is typically conducted by physically detaching the sheet material attached to the substrate in a laboratory setting to measure the adhesion strength. However, direct measurement of the adhesion strength for waterproofing layers applied onsite is less prevalent [3]. As a result, while sheet-type waterproofing materials undergo quality testing by accredited testing agencies to obtain adhesion strength test reports prior to their delivery to the construction site, there are no established test methods or criteria for verifying the adhesion strength after completion of onsite installation. This situation leads to an inability to compare adhesion strength values obtained through laboratory testing with those observed in actual construction settings [3]. To address the challenges associated with onsite adhesion strength evaluation of self-adhesive waterproofing sheets, researchers and practitioners have conducted various studies on the subject. Several researchers have investigated the effects of environmental conditions on the adhesion performance of self-adhesive waterproofing sheets during onsite installation. For instance, [PERSON] et al. explored the impact of prolonged exposure to saline water on the adhesion strength of polyurea [4]. Previous research by [PERSON] et al. explored the general assessment of the adhesion strength indicators of polymer-cement repair materials onto the concrete base and the degree of the repeatability of the results [5]. [PERSON] et al. provide an extensive study on the topic of the curing process and the thermal failure of the adhesive-bonded structures based on the damping measurement using quantitative electromechanical impedance [6]. [PERSON] et al. studied the effects of different wet surface conditions on the adhesion strength of the synthetic polymer rubberized gel waterproofing materials and proposed a new method and experimental regime to assess the adhesive performance of the waterproofing material [7]. In construction sites, sheet waterproofing materials and their adhesion methods can be broadly classified into bond-type adhesion and self-adhesive methods. Bond-type adhesion involves using bonding agents such as asphalt-based or epoxy-based adhesives to attach materials like asphalt sheets, synthetic rubber sheets, and polyvinyl chloride (PVC) sheets to the substrate [8]. On the other hand, self-adhesive methods involve the factory application of a tacky and flexible rubber asphalt-based adhesive layer to the sheet material, allowing for direct attachment to the substrate without the need for additional adhesives. Recently, self-adhesive waterproofing sheets have been widely used in the external waterproofing of concrete structures, primarily on vertical surfaces, due to their adhesive flexibility and the convenience of direct attachment without the use of separate adhesives [9]. This method aims to facilitate the structural response of the system and expedite the installation process. However, when self-adhesive waterproofing sheets are installed onsite, they are exposed to environmental conditions for a certain period. Prolonged exposure to direct sunlight and temperature fluctuations during the summer season can cause issues such as blistering and delamination of the waterproofing layer, as depicted in Figure 1[10].