Indoor detection method for performance of waterproof adhesive layer material of cement concrete bridge

Abstract

The invention belongs to the technical field of highways and urban roads, and in particular relates to an indoor detection method for performance of a waterproof adhesive layer material of a cement concrete bridge. The detection items comprise normal-temperature adhesive strength, normal-temperature shearing strength, 50-DEG C adhesive strength, 50-DEG C shearing strength, water soaked residual strength and residual strength rate; through the implementation of the detection items, the method can comprehensively evaluate various performance indexes of the waterproof adhesive layer material, and ensure that the screened material can meet various technical requirements related to waterproof, adhesive and water damage resistant performance of the cement concrete bridge; an inclination angle of a clamp adopted for detecting the shearing strength of the waterproof adhesive layer material is 40 degrees, the loading speed of a tester is 50 mm / min, the stress condition of a waterproof adhesive layer under the adverse condition of a vehicle brake is well simulated, and the butt joint with the current specifications is realized; and according to the method, a water soaking test of the waterproof adhesive layer material is designed, and the water damage resistant performance of the waterproof adhesive layer material under the long-term water soaking condition is well evaluated.

Description

Technical field [0001] The invention belongs to the technical field of highways and urban roads, and specifically relates to an indoor detection method for the material performance of a cement concrete bridge waterproof bonding layer. Background technique [0002] At present, many early diseases of cement concrete bridge pavement structure are induced by the waterproof bonding layer. The lack of shear resistance and bonding performance of the waterproof bonding layer material will cause the bridge deck pavement to appear pushing, crowding, and waves. However, the domestic research on the waterproof bonding layer of cement concrete bridges is still in its infancy. There are no perfect detection methods and standards in various places. The choice of waterproof materials mainly depends on the experience of engineers and some simple detection methods. The lack of scientificity has led to the application of a large number of fake and inferior products to the bridge deck paving system,...

AI Technical Summary

Problems solved by technology

"Building Waterproof Coatings Test Methods" (GB / T 16777-1997) stipulates that the method for testing the impermeability of waterproof materials is to apply pressure water on the waterproof layer for 30 minutes, then release the pressure, remove the test piece, and observe with the naked eye Whether there is water seepage or not. Although this method can evaluate the water damage resistance of the waterproof adhesive layer material to a certain extent, it has great defects, because this method only evaluates the waterproof adhesive layer in a short period of time after the construction is completed. Water damage resistance

Because there are many gaps in the surface layer mixture, it is inevitable for rainwater to seep into the pavement layer. When encountering severe weather such as continuous precipitation, rainwater will continue to seep down along the gaps in the mixture, and gather at the waterproof adhesive layer. It cannot be discharged for a long time, causing the waterproof adhesive layer to be in a water-soaked and humid environment for a long time. Whether the waterproof adhesive layer material can maintain the original water damage resistance under this condition is not considered in the specification

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