Measuring method for fracture toughness of bubbling interface of bridge deck pavement layer

Abstract

The invention discloses a measuring method for fracture toughness of a bubbling interface of a bridge deck pavement layer. The method comprises the following steps: (1) taking bridge deck pavement layer test pieces in different bubbling radiuses; (2) applying an even load to the bridge deck pavement layer; (3) recording a bubbling change and processing, calculating to obtain a deflection w; (4) calculating an elasticity modulus E in combination with a deflection w formula; (5) according to a critical load q and E, calculating a critical energy release rate GC; (6) according to modal analysis,acquiring critical stress intensity factors K1c and K2c of I-type and II-type fracture interfaces; (7) according to the step (6), calculating a modal phase angle Psi; (8) according to GC, Psi and interface fracture toughness Gamma 0 (Psi), acquiring pure I-type interface fracture toughness GIC and a test parameter Lambda; and (9) through Gamma 0 (Psi), evaluating the extend property of the bubbling interface of the bridge deck pavement layer. The method is used for evaluating the extend property of the bubbling interface of the bridge deck pavement layer, and providing a theoretical foundationfor preventing the bridge deck pavement layer from generating damages, such as bubbles and pit slots.

Description

technical field [0001] The invention relates to the field of transportation, in particular to a method for measuring the fracture toughness of the bubbling interface of a bridge deck pavement layer. Background technique [0002] In recent years, with the development and use of new materials and technologies, the transverse cracks and permanent deformation of bridge deck pavement have been reduced, while bubbling has gradually become the main disease type of bridge deck pavement and has attracted widespread attention. Bubbles in bridge deck pavement are generally concentrated between the asphalt layer and the waterproof adhesive layer, or between the waterproof adhesive layer and the bridge deck. When the bridge deck or the top surface of the leveling layer is mixed with water during the construction process, the water will turn into water vapor when heated at high temperature. Due to the small porosity of the pavement layer, the volume will expand, causing the pavement layer...

AI Technical Summary

Problems solved by technology

Under the action of traffic load and temperature, air and moisture in the external environment will infiltrate through bubbling cracks, corrode the bridge deck, and even cause water damage to the pavement layer, which will have a serious impact on driving safety and the service life of the bridge. There will also be large-scale paving renovations, which will cause huge economic losses and adverse social impacts

[0004] At present, post-processing methods are generally adopted for bubbling diseases at home and abroad, such as the use of perforated water drainage and decompression, pre-grooving drainage and other measures. Moreover, when the bubbling occurs, there is no specific evaluation method and evaluation index to guide the repair of the bubbling disease of the bridge deck pavement, and it is impossible to fundamentally solve the effect of the bridge deck pavement bubbling on the bridge deck pavement. hazards

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