Study On The Prediction System For Life Of Acrylate Spray-applied Waterproof Membrane Based On CT Technology

According to statistics, the leakage of traffic tunnels is a serious problem in China, and the overall quality of prevention and drainage projects in subway tunnels is not satisfied. With the rapid growth in the number and length of constructing tunnels in recent years, and large-scale construction of subway, the environmental standards are also rising. Acrylate spray-applied waterproof membrane as an environment-friendly polymer waterproof material and has huge potential applications.Acrylate spray-applied waterproof membrane is used in tunnel and underground engineering, and its importance is self-evident. Since the maintainability of tunnel is poor, it requested the life of the waterproof layer will be as long as possible. In this thesis, the acrylate spray-applied waterproof membrane was set of the study subject, combined with pre-test by simulating the mechanics and chemical environment of their service stage and the characteristics of the material itself to derive its service life.For the destructive effects of the pressure, tension and shear on the waterproof material by tunnel lining deformation are regard as the main influence factors. In this thesis, they were simulated by the test equipments and the waterproofing effectiveness of acrylate spray-applied waterproof membrane was studied under the conditions of different external force and water pressure in the simulation test. The strain of 0.4 of membrane thickness was set as the critical failure criterion according to the test result.For the impact of SO42-, CP OH-and other anions on the waterproof material in the groundwater environment, the reactions of waterproof membrane in the environment with single and two anions mixed environment were simulated, and the waterproofing membrane was detect by computer tomography (CT) technology. The number of CT reduction to 40% was selected as the critical failure criterion base on the test result.After adding cross-linking, the structure of waterproofing membrane was changed from linear into three-dimensional network structure. The transform induced the major changes of the macro-physical mechanical properties and chemical stability, and made the acrylate spray-applied waterproof membrane more extensive valuable, so the thesis tried to use the cross-linking density to predict the service life of the acrylate spray-applied waterproof membrane.Finally, a prediction method of the service life of acrylate spray-applied waterproof membrane in its service environment is put forward in this paper.