Test method for asphalt mixture pull-out test

Abstract

The invention discloses a test method for an asphalt mixture pull-out test. In the present invention, the test method for the asphalt mixture pull-out test needs the following tools and devices: a pull-out tester is provided; an asphalt mixture sampler; a cleaning machine; a drying machine, a constant-temperature curing box, and an alternating current supply device; the method includes opening thepull-out tester; setting system parameters after startup, placing a drawing test piece in clamping openings of the upper clamp and the lower clamp, using a ratchet wrench for rotating a fastening bolt to clamp the test piece, starting the test can after the temperature of the constant-temperature temperature control box of the drawing test equipment reaches a set test temperature; and after the test is finished, enabling a computer to automatically collect and calculate a test result; the upper clamp mechanism and the lower clamp mechanism ensure that the fixed position of the drawing test piece is always in the center of the drawing force, and the heater and the condenser can keep the experimental environment temperature consistent with the experimental environment temperature during natural storage, thereby improving the experimental accuracy.

Description

technical field [0001] The invention belongs to the technical field of performance detection of asphalt mixture, in particular to a test method for drawing test of asphalt mixture. Background technique [0002] The bonding performance test of asphalt pavement bonding first appeared in the test of bridge deck waterproof materials. Most countries in Europe and the United States have relevant standards and specifications for special testing. my country's "Technical Specifications for Highway Asphalt Pavement Construction" (JTG-2004) requires The asphalt pavement adopts layered construction. Before paving a certain structural layer, the underlying layer should be treated to keep the surface clean, and the permeable layer oil should be spread between the base layer and the surface layer, and the sticky layer should be sprinkled between the surface layers. Oil, although the current specification stipulates the specification and dosage of penetrating layer oil and viscous layer oil, ...

AI Technical Summary

Problems solved by technology

[0003] So far in my country, in the new version of the "Draft for Comments on Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" in 2019, the adhesive layer oil bond strength test (pull-out method) has been added, and the supporting equipment requires additional fixtures for the Marshall testing machine. Moreover, during the drawing test, the longitudinal force of the Marshall instrument is uneven, which affects the test results, and the quality of the drawing equipment on the market is uneven, there is no unified technical parameter, and the inconsistency of the equipment may lead to inconsistent test results

[0004] The equipment on the market mostly adopts the form of liquid glue bonding when fixing the test pieces, which causes two disadvantages. One is that a large number of test pieces are required for the liquid glue to take effect. Generally, it takes about 24 hours to fully consolidate, which is a waste of time; Especially in the process of drawing test, there will be a phenomenon that the bonding surface is pulled apart, which leads to the need to bond the specimen and the fixture again, wasting a lot of time, and the third is that the bonding surface may be unevenly bonded , the stress on the specimen is not uniform during the drawing process, which affects the test results