CN211318060U

CN211318060U - Asphalt mixture water stability test device

Info

Publication number: CN211318060U
Application number: CN201922277672.8U
Authority: CN
Inventors: 于海祥; 李春涛; 朱弟军; 周鹍; 王钰龙; 冯易
Original assignee: Chongqing Keli Construction Engineering Quality Testing Co ltd; Chongqing Construction Engineering Group Co Ltd
Current assignee: Chongqing Keli Construction Engineering Quality Testing Co ltd; Chongqing Construction Engineering Group Co Ltd
Priority date: 2019-12-17
Filing date: 2019-12-17
Publication date: 2020-08-21
Anticipated expiration: 2029-12-17

Abstract

The utility model provides a bituminous mixture water stability test device, including box and lid, the box with the lid lock constitutes an airtight space together, the bottom half is provided with the heater, be provided with protruding edge on the box inner wall, protruding edge is located heater upper portion, protruding edge is gone up and is arranged and is carried the thing sieve, carry the thing sieve with be provided with the agitator between the heater, be connected with the temperature measuring head that is used for measuring the temperature in the box on the lid, still be provided with the measurement on the lid the box with the manometer of lid space internal gas pressure, still be provided with on the lid to the inlet tube of water injection in the box and to aerify the pressurized gas tube and to the exhaust tube of the internal pressure reduction of bleeding in the box in to the box. The utility model discloses can simulate the actual operating mode of bituminous paving under the hydraulic pressure effect betterly.

Description

Asphalt mixture water stability test device

Technical Field

The utility model relates to an experimental apparatus for bituminous mixture, especially a bituminous mixture water stability test device.

Background

The expressway in China is developed rapidly, and the asphalt pavement becomes a main pavement form. Due to the increasing traffic volume, asphalt pavements face severe tests, and the phenomenon of early damage of pavements is common, wherein the damage caused by the action of hydrodynamic pressure is particularly prominent. Rainwater enters the pavement structure through gaps or cracks of the pavement, and free water cannot seep out to form retained water. When the vehicle passes through the road surface with the retained water or the water accumulated on the road surface, the water between the tires and the road surface is continuously extruded by the tires which run at high speed to form the hydrodynamic pressure, so that the softening and the stripping of the asphalt mixture are accelerated, and the road performance of the asphalt mixture is seriously influenced. Therefore, the highway industry generally attaches great importance to the severity of the early damage, and researches mainly focus on analyzing the damage mechanism of the water damage and how to evaluate the water damage resistance of the asphalt mixture, and improve and enhance the water damage resistance of the asphalt mixture according to the evaluation result. The evaluation is mainly completed through experiments, the existing water stability evaluation experiment methods are various, and for one experiment evaluation method, the experiment conditions including materials, forming processes, environment, load, temperature and the like are matched with the actual conditions. At present, indirect methods such as laboratory test soaking Marshall residual stability, Marshall freeze-thaw splitting tensile strength ratio and the like are generally adopted to evaluate the water stability of the asphalt mixture. However, none of these methods can effectively simulate the actual working conditions of the wheel-water-road interaction under the action of the hydrodynamic pressure generated by the wheels, and the evaluation method and index thereof do not establish a good correspondence with the road performance.

SUMMERY OF THE UTILITY MODEL

The utility model provides a bituminous mixture water stability test device to the problem that the experimental means that exists among the prior art can not simulate the road surface effectively under the hydrodynamic pressure effect that the wheel produced wheel-water-road surface interact's operating condition, the utility model provides a bituminous mixture water stability test device.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides an asphalt mixture water stability test device, includes box and lid, the box with the lid lock constitutes an airtight space together, the bottom half is provided with the heater, be provided with protruding edge on the box inner wall, protruding edge is located heater upper portion, protruding edge is last to have arranged and is carried the thing sieve, carry the thing sieve with be provided with the agitator between the heater, be connected with the temperature measuring head that is used for measuring the temperature in the box on the lid, still be provided with on the lid and measure the box with the manometer of lid space internal gas pressure, still be provided with on the lid to the inlet tube of water injection in the box and to aerify the ascending gas tube of pressurization in the box and to the exhaust tube of the step-down of bleeding in the box.

The stirrer is used for stirring water, so that the water temperature is as uniform as possible, and the accuracy of an experimental result is ensured.

Generally, the box body and the cover body are fastened and fixed together by a U-shaped locking block.

Preferably, a sealing rubber ring for preventing air leakage is arranged on the combination surface of the box body and the cover body.

Compared with the prior art, the utility model discloses following beneficial effect has:

the actual working condition of the asphalt pavement is effectively simulated, and more accurate experimental data can be obtained. Heating water in a box body to a temperature required by simulation, then putting an asphalt mixture molding test piece on a carrying sieve in the box body for soaking and heat preservation, and then filling compressed air into a closed container, namely applying positive pressure to the water and the test piece; and then vacuumizing the closed container to a certain pressure, namely applying negative pressure to the water and the test piece, then releasing the pressure of the closed container to normal pressure, and circulating according to the process, thereby completing the simulation process of the pressure of the water under the action of the asphalt mixture and simulating the actual working condition of the asphalt pavement.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings and embodiments.

As shown in figure 1, the utility model provides a bituminous mixture water stability test device, including box 1 and lid 2, the turn-ups of box 1 and lid 2 are together fixed with U type locking piece 7 lock, constitute an airtight space, have arranged the sealed rubber ring (not shown in the figure) of leak protection gas on the faying face of box 1 and lid 2. The bottom of the box body 1 is provided with a heater 3, the heater 3 adopts an electric heater, and the control module realizes that the water temperature is stabilized at a certain experimental water temperature by controlling the power consumption of the heater 3. Be provided with protruding edge on the 1 inner wall of box, protruding edge is located 3 upper portions of heater, protruding edge is gone up and is shelved and carry thing sieve 5, it has the via hole that is used for water to pass through to carry on thing sieve 5, it is provided with agitator 4 to carry between thing sieve 5 and heater 3, be connected with the temperature measurement head 6 that is used for measuring the temperature in the box 1 on the lid 2, still be provided with the manometer 8 of measuring box 1 and lid 2 space internal pressure on the lid 2, still be provided with the inlet tube 9 of water injection in the box 1 and to the gas filled pressurized gas tube 10 of inflating in the box 1 and to the exhaust tube 11 of bleeding step-down in the box 1 on the lid 2.

The utility model discloses a use method does: firstly, injecting water into a box body 1, heating the water in the box body 1 to a temperature required by simulation, then placing an asphalt mixture molding test piece into the box body 1 on a carrying sieve 5 for soaking and heat preservation, sealing and closing the box body 1 and a cover body 2 together, and then filling compressed air of about 0.7MPa into a closed container formed by the box body 1 and the cover body 2, namely applying positive pressure to the water and the test piece; vacuumizing the closed container to 97.3-98.7KPa, namely applying negative pressure to the water and the test piece; and then, releasing the pressure of the closed container to normal pressure, and circulating according to the process, thereby completing the simulation process of the pressure of the dynamic water of the asphalt mixture.

Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims

1. The utility model provides an asphalt mixture water stability test device, its characterized in that, includes box (1) and lid (2), box (1) with lid (2) lock constitutes an airtight space together, box (1) bottom is provided with heater (3), be provided with protruding edge on box (1) inner wall, protruding edge is located heater (3) upper portion, protruding edge is last to have arranged and is carried thing sieve (5), carry thing sieve (5) and be provided with agitator (4) between heater (3), be connected with temperature measuring head (6) that are used for measuring the temperature in box (1) on lid (2), still be provided with on lid (2) and measure box (1) with manometer (8) of lid (2) space internal gas pressure, still be provided with on lid (2) to the inlet tube (9) of water injection in box (1) and to the gas-filled pressurized gas tube (10) in box (1) and to box (1) 1) An air extraction pipe (11) for internal air extraction and pressure reduction.

2. The asphalt mixture water stability test device according to claim 1, wherein the box body (1) and the cover body (2) are fastened and fixed together by a U-shaped locking block (7).

3. The asphalt mixture water stability test device as claimed in claim 2, wherein a sealing rubber ring for preventing air leakage is arranged on the combination surface of the box body (1) and the cover body (2).