An apparatus for testing paving samples includes a base that includes a paving sample tray about the cabinet and configured for translation relative to the cabinet. A roller is configured for imparting compressive forces to a sample carried by the sample tray. An arm is configured for moving the roller from a stowed position to an in-use position where the roller contacts the sample. A cylinder assembly having a piston therein supplies pressure forces to the arm to move the arm from the stowed position to the in-use position, wherein a depth of travel of the arm is limited by the sample. As the sample is compressed, the depth of travel increases. A measurement device is in communication with the cylinder for determining an amount of travel of the arm to thus determine an amount of compression of the sample.

A bending test device to bend a product as a test includes a base, a driving mechanism, and a bending mechanism. The driving mechanism and the bending mechanism are set on the base. The bending mechanism includes a supporting member, a rotating plate, a first holding part, and a second holding part. The supporting member is set on the base. The rotating plate is rotatably set on the supporting member. The rotating plate connects to the driving mechanism. The first holding part and the second holding part are set on the rotating plate. The first holding part clamps a first part of a workpiece, the second holding part clamps a second part of the workpiece. The driving mechanism rotates the rotating plate and thus drives the second holding part to rotate and bend the workpiece.

A portable flexure fixture including a fixture housing, a translatable plug, a load ring, and a support ring. The fixture housing includes a first end opposite a second end, a plug receiving opening extending into the first end and a test opening extending into the second end. The support ring is disposed in the fixture housing. The translatable plug is insertable into the plug receiving opening of the fixture housing and is translatable in both a sample engaging direction and a sample releasing direction. Further, the load ring is coupled to the translatable plug and is positioned at a sample facing end of the translatable plug such that translation of the translatable plug in the sample engaging direction translates the load ring in the sample engaging direction and translation of the translatable plug in the sample releasing direction translates the load ring in the sample releasing direction.

The vertical counterforce loading device includes a concrete support member, four transfer components, four connection components, a vertical force transmission component and a load test soil layer. The concrete support member is formed by pouring and concreting below the load test soil layer. The four transfer components are divided into two groups to be symmetrically and parallelly anchored in the concrete support member. The vertical force transmission component includes a load plate, a jack, a primary beam and a secondary beam arranged in sequence from bottom to top. The load plate is installed on the load test soil layer. The number of the secondary beams is two, and the two secondary beams are connected crosswise to both ends of the primary beam. The end portions of the two secondary beams are respectively connected to second ends of the four connection components through reinforcement components.

The present invention discloses a method for detecting compaction and shear strength characteristics of an asphalt mixture during construction compaction. The method mainly includes the following steps: using a device for detecting compaction and shear strength characteristics of the asphalt mixture; pressing a test claw into the asphalt mixture during construction; rotating the test claw slowly and uniformly to measure an internal temperature and a shear characteristic of the mixture during paving and subsequent compaction; calculating a corresponding compaction detection index based on the shear characteristic; and monitoring and guiding the construction quality and construction process accordingly based on the real-time detection index. The present invention measures the compaction detection index of the asphalt mixture during compaction simply, quickly and accurately. The present invention uses the compaction detection index together with a degree of compaction for dual control of asphalt pavement compaction.

Fatigue limit testing method for specimens comprising subjecting a specimen (10) to be tested to successive test blocks (1, 2, 3, 4, 5, 6, 7), each test block (1, 2, 3, 4, 5, 6, 7) comprising applying to the specimen successive cyclic loads according to load parameters with an amplitude bigger than the load parameters of cyclic loads of the preceding test block; subjecting said specimen to successive deformation tests (a, b, c, d, e, f), each deformation test being performed between two successive test blocks and comprising the application of a isolated specific load to the specimen and performing deformation measurements from said element while being subjected to said specific load; and characterizing a fatigue behavior of the specimen considering at least a variation occurring on the successive deformation measurements and considering the load parameters of cyclic loads preceding each deformation measurement.

A rock mass shear test system for high-energy accelerator computed tomography (CT) scanning includes double horizontal loading devices, a first bearing device for bearing a static shear box, a second bearing device for bearing a dynamic shear box, and a normal loading device, etc. In the test, the double horizontal loading devices simultaneously apply an identical loading force to the rock mass, and the normal loading device applies a shear force to the rock mass. The double horizontal loading devices are provided in parallel and spaced apart, a loading force is applied in the horizontal direction, and a shear force is applied in the vertical direction, so that the loading cylinder and the rock mass sample are effectively prevented from interfering with each other during the accurate scanning process of the shearing progressive failure process of the rock mass.

The invention discloses an experimental system of surrounding rock and lining structure under unequal surrounding pressure and water pressure, comprising: reaction wall, lining structure, external water pressure loading mechanism, internal water pressure loading mechanism, prestress-loading mechanism, surrounding rock layer and monitoring device. The Experimental System can simulate the stress characteristics and related deformation characteristics of the surrounding rock of the tunnel and the lining structure of the water conveyance tunnel under complex internal and external loads in the actual environment, and can help to analyze and study the broken appearance of the lining structure and the crack distribution after cracking.

A footprint generator capable of applying a constant force includes: a base plate in which a target surface may be on an upper surface of the base plate; a shoe mounting member that is apart from the upper surface of the base plate and capable of mounting a shoe; a driving unit that is apart from the upper surface of the base plate and capable of moving the shoe mounting member up and down; and a force measuring unit configured to measure an impact force when the shoe mounting member descends and contacts the shoe with the target surface to generate a footprint on the target surface.

Disclosed are a rolling test device and a rolling test method. The rolling test device includes a test platform having a rolling surface for placing a test piece to be rolled; a rolling jig located on one side of the rolling surface; and a driving member connected to the rolling jig. A roller is connected to one end of the rolling jig towards the rolling surface, and after the roller is pressed against the rolling surface, the driving member drives the rolling jig to move on the rolling surface to drive the roller to perform a rolling test on the rolling surface.