Waterproof performance of non-curable rubber modified asphalt material at deformation joints

ABSTRACT In order to study the waterproof performance of non-curable rubber modified asphalt material at deformation joints, the grouting situation of non-curable rubber modified asphalt material in the deformation joint was simulated through the test, the maximum opening amount of deformation joint under the action of constant water pressure was studied, and the corresponding waterproof performance was evaluated. The results show that under water pressures of 0.25 MPa, 0.3 MPa and 0.4 MPa, the widths of deformation joints that the non-curable rubber modified asphalt material can bear are about 11.5 mm ~ 12 mm, 11 mm ~ 11.5 mm and 10 mm ~ 11 mm, respectively. Meantime, the failure types of deformation joints under different water pressures are further clarified. When the water pressure is high, if there is water leakage in the deformation joint, cracks may appear along the direction of deformation joint, which will lead to the failure of deformation joint and gradually expand the failure range along the direction of deformation joint. When the water pressure is low, the occurrence probability of cracks is small and the failure range is relatively limited. The research has considerable guiding significance to the waterproofing of tunnel engineering.