Evaluation index for anti-shearing performance of waterproof bonding layer paved on bridge deck

Abstract

The invention discloses an evaluation index for the anti-shearing performance of a waterproof bonding layer paved on a bridge deck. According to the evaluation index disclosed by the invention, freezing and thawing cycle lateral stiffness ratio LSR is adopted for evaluating, wherein LSR is not smaller than 85%, LSR is the ratio of the lateral stiffness of a freezing and thawing cycle test specimen to the lateral stiffness of an unfreezing and un-thawing cycle test specimen, the lateral stiffness LS is the ratio of the peak load to the maximum relative displacement among layers when a waterproof bonding layer of tar sands or modified tar sands is subjected to shear failure, and the shear force and the displacement in LS index among the layers can be accurately tested, the operation is simple and convenient, thus popularization is easy. According to the evaluation index disclosed by the invention, the defects that in the current regulation of China, the triaxial compression shear strength test is difficult to operate and complicated in calculation, and the shear strength parameters c and phi have small difference are overcome; the lateral deformation resistance of the waterproof bonding layer paved on the bridge deck can be truthfully reflected; the LSR is also suitable for evaluating the anti-shearing performance of a bituminous mixture; the LSR integrates high temperature property, low temperature property and high stability of the bituminous mixture, and can comprehensively evaluate the pavement performance of the bituminous mixture.

Description

technical field [0001] The invention relates to the technical field of road engineering, in particular to an evaluation index for the shear resistance performance of asphalt sand and modified asphalt sand bridge deck pavement waterproof bonding layer. Background technique [0002] At present, my country's road construction industry is booming. With the extension of road mileage and the improvement of grades, the proportion of road structures such as bridges is increasing, and it has become an important part of national infrastructure construction. Wherein a large amount of overpass bridges, large and extra-large river-crossing bridges and viaducts passing through urban areas and the like mostly adopt the structural type of adding asphalt concrete pavement on the cement concrete bridge deck. However, the early damage of the pavement system during construction and use is increasingly common and serious, many of which are caused by improper selection of waterproof bonding mater...

AI Technical Summary

Problems solved by technology

Especially with the increase of traffic volume and heavy vehicles, the damage will be more serious under the condition of heavy load and overload. Even, when the bridge deck is paved, the paver and material truck may stick away the waterproof layer. In the future, the waterproof layer will not have the desired effect, and the water infiltration from the surface layer will make its horizontal shear resistance weaker, and the bonding performance will be worse, and the integrity will be lost, thus forming a vicious cycle.

[0004] At present, the research and experiment on the waterproof adhesive layer of the bridge deck has just started, and its performance indicators and evaluation methods are not perfect enough, and there is no test procedure for the evaluation of the mechanical properties of the waterproof adhesive layer. The materials for the waterproof adhesive layer of the highway concrete bridge deck Systematic, complete and unified standards and specifications have not yet been formed in terms of selection, design, testing, testing and construction.

There are many types of waterproof materials on the market, good and bad are mixed, and the structure of the waterproof layer applied on the bridge deck is also diverse. There is no unified material selection and quality inspection standard. Therefore, the selection and use of the waterproof adhesive layer is blind and cannot be based on Operating in different actual situations, the theoretical and experience levels are backward, resulting in improper material selection and design of the bridge deck waterproof bonding layer, and no rules to follow in construction quality control

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