Method and device for synchronously testing tension, compression and split resilience moduli of pavement material

Abstract

The invention discloses a method and device for synchronously testing tension, compression and split resilience moduli of a pavement material. The method comprises the following steps: performing a split loading test on a test sample through an MTS multifunctional material testing system, and deducing computing formulae for the tension modulus and the compression modulus of the pavement material test sample during split loading; and respectively pasting resistance strain gages on horizontal radial and vertical radial centers in the front and back parts of the test sample, measuring the average tension strain and the average compression strain of the center positions of the test sample, measuring the horizontal radial deformation of the test sample through a displacement sensor, and substituting in the formulae to obtain the testing results of the split modulus, the tension modulus and the compression modulus of the material. According to the invention, the three moduli of the material can be simultaneously measured through a single test, thereby improving the modulus testing precision and test efficiency of the pavement material and lowering the indoor test and testing cost; and accurate design parameters can be provided for scientific design of a durable pavement considering the difference in the tension and compression moduli of the material.

Description

technical field [0001] The invention relates to a technical method for indoor testing of modulus of road materials in the field of road engineering, in particular to a device and method for testing tensile, compressive and splitting resilience moduli of semi-rigid base materials and asphalt mixtures. Background technique [0002] At present, the asphalt pavement design method in my country adopts the theory of elastic layered system with the assumption of isotropy of structural layer materials, and simply uses the unconfined compressive modulus of resilience as the design parameter in the design of pavement structure. However, a large number of tests have proved that semi-rigid base materials for roads and asphalt mixtures exhibit anisotropic properties with different tensile and compressive moduli, and generally the compressive modulus is much greater than the tensile modulus. In the actual stress of the pavement structural layer, there are generally both tensile stress are...

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Problems solved by technology

The compressive modulus of resilience test is mainly divided into the top surface method or the bearing plate method, both of which are tested under the unconfined unidirectional compression state; the bending and tensile modulus of resilience test, although the material of the pavement structure layer is considered It is actually in a stress state where the upper part is under compression and the lower part is under tension, but the theory of modulus calculation is based on the assumption that the tensile and compressive moduli of the mixture are the same, and the influence of shear action on deflection is not considered, resulting in the calculated bending die The measurement error is relatively large, which cannot accurately reflect the real mechanical properties of the material; the splitting rebound modulus is an indirect tensile test, and its stress state is closer to the real stress state of the pavement structural layer

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