Testing apparatus and testing method for testing interlayer connection strength of pavement layers

Abstract

The invention discloses a testing apparatus and a testing method for testing interlayer connection strength of pavement layers. The testing apparatus comprises a pavement layer sample, a vertical pressure applying device, and a torsional shearing device; the vertical pressure applying device is arranged above the pavement layer sample and the torsional shearing device; the vertical pressure applying device is used for applying vertical pressure on to the pavement layer sample; the pavement layer sample is composed of an upper layer pavement sample, a waterproof bonding layer sample and a lower layer pavement sample; the upper layer pavement sample comprises a circular ring-shaped core sample and an inner cylinder sample; the torsional shearing device is used for clamping the upper layer pavement sample firmly in horizontal plane, and applying torque onto the upper layer pavement sample; and the torsional shearing device is provided with a torque wrench determinator. The testing apparatus and the testing method are capable of realizing torsional shear failure under the action of variable positive pressure; in addition, elimination of influences of mixture size on testing results is realized via a plurality of times of processing of testing samples; the testing apparatus and the testing method are designed to accord with theory and failure reality; and operation is convenient.

Description

technical field [0001] The invention belongs to the technical field of pavement engineering equipment, and in particular relates to a test device for interlayer connection strength of pavement layers and a test method using the test device. Background technique [0002] Asphalt concrete pavement, especially bridge deck pavement, is an important factor affecting the overall performance of structural layers. The results of mechanical analysis show that after the state of the interlayer changes from continuous to smooth, the shear stress within or between layers of the pavement increases geometrically. premise, but the connection state of the pavement after actual construction does not conform to the theoretical assumptions, and there is also a lack of reasonable and effective means for evaluation. The lack of testing equipment and testing methods leads to the lack of effective quality control of the state between pavement layers, resulting in Early damage problems such as pus...

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Problems solved by technology

[0004] In 2005, the US National Highway Cooperative Research Program (NCHRP) initiated a study on the determination of adhesive layer materials (NCHRP Project9-40), and the International Association for Experimental Research in Materials and Structures (RILEM) also initiated a similar program. The test methods and evaluation standards for the interlayer connection performance of paving layers have not formed a unified testing equipment. At present, some universities and research departments have disclosed the instruments and methods for testing the connection performance of the adhesive layer. However, such testing equipment has The structure is heavy and complex, the test results show poor reproducibility, the site lacks operability, the actual failure form is different from the theoretical simulation, and it is difficult to realize the unification of indoor and outdoor testing methods for the bridge deck bonding layer.

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