CN112415179A

CN112415179A - Submerged rut test auxiliary device and test method

Info

Publication number: CN112415179A
Application number: CN202011306084.3A
Authority: CN
Inventors: 徐伟; 陈政雄; 李智; 王峰
Original assignee: South China University of Technology SCUT
Current assignee: South China University of Technology SCUT
Priority date: 2020-11-20
Filing date: 2020-11-20
Publication date: 2021-02-26

Abstract

The invention discloses an auxiliary device for a water-immersion rut test, which comprises a base, a handle and a fixing clamp, wherein the base is made of metal; the handle comprises a first handle and a second handle which are symmetrically connected to two sides of the base; the fixed screens include first fixed screens, second fixed screens, third fixed screens and fourth fixed screens, become rectangle distribution and connect in the base bottom to in forming a whole with base and handle, exert the effect of fixed rut board mould. The invention also provides a corresponding test method. The invention has simple structure and convenient operation, can measure the high-temperature anti-rutting capability and the water damage resistance capability of the asphalt mixture under unconventional test conditions (water even saline water environment), is used for testing the high-temperature stability and the water damage resistance performance of the asphalt mixture during the mix proportion design, and enables the traditional rutting tester to finish the quantitative evaluation of the performance of the asphalt mixture under the water immersion condition.

Description

Submerged rut test auxiliary device and test method

Technical Field

The invention relates to the field of asphalt mixture performance testing, in particular to an auxiliary device and a testing method for a water-soaked rut test.

Background

At present, more than 90% of the constructed highways in China adopt asphalt concrete pavements, but the asphalt concrete pavements often have various damages, water damage is one of the most common damages, and the water damage is also one of the main causes of the damages of other asphalt concrete pavements, so that the importance of researching the water damage resistance of asphalt mixtures can be seen. (Chenhaipeng, Shipeng, high initiation, Shenju Man. study of Water stability and rutting resistance of asphalt mixture based on Rut immersion test [ J ]. Highway, 2016,61(03):149-154.)

Asphalt rutting tests include standard rutting tests and submerged rutting tests, which are often used to evaluate the high temperature rutting resistance and water damage resistance of asphalt mixtures. (Sunchongxin. adopting a water-immersed rutting test to evaluate the water stability performance of the asphalt mixture [ J ]. Guangdong road traffic, 2005(03): 6-9.). The traditional rut testing machine can only carry out a standard rut test (road engineering asphalt and asphalt mixture test procedure JTG E20-2011) generally and cannot independently carry out a water immersion rut test; there are already instruments available on the market that can perform the flooding rut test, such as: HLR-3 type rut instrument produced by Beijing Hualian technical research institute. (Yehua. water immersion rutting test is used for evaluating water stability research of asphalt mixture [ J ]. traffic standardization, 2011(08):21-24.), but the problems of high price, low utilization rate and the like are faced, so that a plurality of schools and scientific research institutions are not purchased. Therefore, the invention provides test conditions for the traditional rut testing machine to carry out the water immersion rut test through inventing the auxiliary device for the water immersion rut test.

In the existing test means, on one hand, the traditional standard rut testing machine cannot independently carry out the water immersion rut test; on the other hand, the novel rut meter can be used for a water immersion test, but has the problems of high price, low utilization rate and the like. Therefore, it is necessary to design a set of test accessories for the immersion rut test for the conventional standard rut testing machine. The invention has simple structure and low manufacturing cost, and can meet the requirements of scientific research personnel on the quantitative evaluation of the high-temperature anti-rutting performance and the water damage resistance of the asphalt mixture.

Disclosure of Invention

The application aims at providing a submerged rut test auxiliary device. The invention solves the problem that by designing the auxiliary device for the water-immersed rut test, test conditions are provided for the water-immersed rut test of the traditional rut testing machine, and the high-temperature rut resistance and the water damage resistance of the asphalt mixture under the water immersion condition are researched by testing under different test modes (such as 60 ℃ or 70 ℃), so that a research means is provided for comprehensively evaluating the performance of the asphalt mixture.

The purpose of the invention is realized by the following technical scheme:

an auxiliary device for a water-immersed rut test comprises a base and a rut plate test piece mold,

a first groove is formed in the base and used for forming a water immersion test environment;

the rutting plate test piece mold is detachably fixed in the first groove, and a second groove used for containing a rutting plate test piece is formed in the rutting plate test piece mold.

Further, the handle comprises a first handle and a second handle, wherein the first handle and the second handle are symmetrically and fixedly arranged on two side walls of the base. Through setting up first handle and second handle, can be more convenient when removing and installing experimental auxiliary device of flooding rut.

Further, the first handle and the second handle are both made of metal materials.

Furthermore, the inner bottom surface of the base is provided with a fixed clamping position, and the rut plate test piece mold is clamped and fixed in the fixed clamping position.

Further, fixed screens is including the first fixed screens, the second fixed screens, the third fixed screens and the fourth fixed screens that are the rectangular distribution, rut board test piece mould card is established in the space that first fixed screens, second fixed screens, third fixed screens and fourth fixed screens enclose. The first fixing clamping position, the second fixing clamping position, the third fixing clamping position and the fourth fixing clamping position play a role in fixing the rut plate test piece mold, so that horizontal displacement of the rut plate test piece mold cannot occur in the test process.

Furthermore, the first fixing clip, the second fixing clip, the third fixing clip and the fourth fixing clip are all made of metal materials.

Further, water or salt solution is injected into the first groove to form a water immersion test environment.

Further, the liquid level of the water or the solution is higher than the top surface of the rut plate test piece mold. So set up, can guarantee that rut board test piece is in the state of soaking.

Further, the base is made of metal.

The invention also provides a test method of the submerged rut test auxiliary device, which comprises the following steps:

preparing an asphalt mixture, pouring the asphalt mixture in a track plate test piece mold for compaction molding to prepare an asphalt concrete track plate test piece, and performing health maintenance;

installing a combination of a rut plate test piece mold and a rut plate test piece in a first groove of the submerged rut test auxiliary device, and then installing the submerged rut test auxiliary device in a rut tester;

electrifying the rut tester, opening temperature control, filling liquid into the first groove to form a water immersion environment, and immersing the top of the rut plate test piece mold by the liquid;

and after the auxiliary device for the water immersion rut test is subjected to heat preservation in the rut tester for a period of time, the test button is opened to carry out the water immersion rut test.

Compared with the prior art, the application has at least the following beneficial effects:

the application provides a submerged rut test auxiliary device, simple structure, design benefit, the low price provides the route of analysis and evaluation for the high temperature resistance ability and the water damage resistance ability of sign bituminous mixture. The asphalt concrete rut plate test piece and the rut plate test piece mold which are manufactured and maintained are installed between the four fixing clamping positions of the auxiliary device for the water immersion rut test, the purpose of adjusting the height of liquid is achieved by controlling the amount of water or saline solution injected into the groove of the base, and the rut plate test piece mold is preferably immersed, so that test conditions are provided for the water immersion rut test of a traditional standard rut testing machine, and the requirements of scientific research personnel on quantitative evaluation of the high-temperature rut resistance and the water damage resistance of an asphalt mixture are met.

Drawings

FIG. 1 is a schematic front view of an attachment for a rut test.

Fig. 2 is a left side view of an attachment for a rut testing apparatus.

FIG. 3 is a schematic top view of a submerged rut testing attachment.

Fig. 4 is a schematic front view of a rut plate test piece mold.

Fig. 5 is a left side view of the rut plate test piece mold.

Fig. 6 is a schematic top view of a rut plate test piece mold.

Fig. 7 is a cross-sectional view of a test piece mold with a rut plate of an auxiliary device for a water immersion rut test.

In the figure: 1-a base; 201-a first handle; 202-a second handle; 301-a first fixed clip; 302-second fixed clip position; 4-a track plate test piece mold; 5-rut plate test piece; 6-water or salt solution.

Detailed Description

The invention is described in further detail below with reference to the figures and examples.

Referring to fig. 1-7, the present embodiment provides an attachment for a rut test, which includes a base 1, a handle and a fixing clip, wherein the base is made of metal material such as stainless steel, and the metal material does not physically and chemically react with a salt solution at a temperature of-20 ℃ to 500 ℃.

A first groove is formed in the base 1, the height of the base wall is 150mm, the thickness of the base wall is 15mm, and the thickness of the bottom of the base is 15 mm.

The handles comprise a first handle 201 and a second handle 202 which are symmetrically fixedly connected to the two sides of the base and play a role of moving or lifting the whole device so as to facilitate the device to be installed on the rut tester.

The fixed screens includes first fixed screens 301, second fixed screens 302, third fixed screens 303 and fourth fixed screens 304, is the bottom of rectangle distribution connection in base 1 to with base 1 and handle integrated into one piece, the effect of fixed rut board mould of performance prevents that the experimental in-process rut board test piece mould of carrying out of flooding from taking place to remove.

A second groove is formed in the rutting plate test piece mold 4, the thickness of the wall and the bottom of the groove is 15mm, and the size of a rutting plate test piece manufactured according to the specification of a rutting test of asphalt mixture of road engineering asphalt and asphalt mixture (JTG E20-2011) is 300mm in length, 300mm in width and 50-100mm in thickness.

The test environment of the water or salt solution for the immersion rut test is formed in the first groove of the base 1, the purpose of adjusting the height of the liquid is achieved by controlling the amount of the water or salt solution injected into the groove of the base, the top of the rut plate test piece mold is preferably immersed by 1-2mm, and an immersion test condition is provided for the test. A1-2 mm liquid immersion rut plate test piece mold simulates the real condition of short-term immersion of a road surface in a rainy day. The liquid level can be higher than the range of 1-2mm, and the liquid level does not overflow the test device; the liquid level height is lower than the range of 1-2mm, so that the rut test piece is not in a soaking state, and the soaking rut test cannot be truly simulated.

In this embodiment, a method for testing the submerged rut test auxiliary device includes the following specific steps:

firstly, preparing a proper amount of asphalt mixture by using an asphalt mixture blender according to road engineering asphalt and asphalt mixture test specification (JTG E20-2011), pouring the prepared asphalt mixture into a rutting plate test piece mold 4 to be compacted and molded, and rolling and molding the rutting plate test piece mold 4 by using a wheel rolling molding machine (at the moment, a rutting plate test piece 5 and the rutting plate test piece mold 4 form a whole), so that a standard asphalt concrete rutting plate test piece 5 is prepared and is cured for 48 hours at room temperature;

secondly, after the maintenance of the rut plate test piece 5 is finished, installing a rut plate test piece mold 4 in the auxiliary device for the water-immersed rut test, and then installing the whole device in a rut tester through a handle;

thirdly, electrifying the rut tester, opening temperature control, slowly injecting water or saline solution heated to 60 ℃ into a first groove of the auxiliary device for the water-immersion rut test, and immersing the top of a rut plate test piece mold by 1-2mm by liquid;

and fourthly, the whole device is insulated in the rut tester for more than 5 hours, and then the test button is started to carry out the water immersion rut test. The test is carried out for 1h under the standard conditions of the temperature of 60 ℃, the load of 0.7MPa and the speed of 42 times/min, and the numerical values of the dynamic stability and the rutting depth of the immersed rut are read through a computer end connected with a rutting tester, so that the requirements of scientific researchers on the quantitative evaluation of the high-temperature rutting resistance and the water damage resistance of the asphalt mixture are met.

More than, the experimental auxiliary device of rut that soaks that this embodiment provided can install on traditional rut testing machine, thereby can soak the rut at traditional rut testing machine and test, and then can survey the high temperature anti rut ability and the water damage resistance ability of bituminous mixture under unconventional test condition (water or even salt water environment), high temperature stability performance and water damage resistance performance inspection when supplying bituminous mixture mix proportion design use, make traditional rut tester can accomplish and become possible to the quantitative evaluation of bituminous mixture performance under the soaking condition. And the auxiliary device has simple structure, convenient installation and strong practicability.

The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a experimental auxiliary device of rut soaks which characterized in that: comprises a base (1) and a rut plate test piece mold (4),

a first groove is formed in the base (1) and used for forming a water immersion test environment;

the rutting plate test piece mold (4) is detachably fixed in the first groove, and a second groove capable of containing a rutting plate test piece (5) is formed in the rutting plate test piece mold (4).

2. The submerged rut testing attachment of claim 1, wherein: the novel multifunctional base is characterized by further comprising a first handle (201) and a second handle (202), wherein the first handle (201) and the second handle (202) are symmetrically and fixedly arranged on two side walls of the base (1).

3. The submerged rut testing attachment of claim 2, wherein: the first handle (201) and the second handle (202) are both made of metal materials.

4. The submerged rut testing attachment of claim 1, wherein: the inner bottom surface of the base (1) is provided with a fixed clamping position, and the rut plate test piece mold (4) is clamped and fixed in the fixed clamping position.

5. The submerged rut testing attachment of claim 4, wherein: fixed screens is including the first fixed screens (301), the fixed screens (302) of second, the fixed screens (303) of third and the fixed screens (304) of fourth that are the rectangular distribution, rut board test piece mould (4) card is established in the space that first fixed screens (301), the fixed screens (302) of second, the fixed screens (303) of third and the fixed screens (304) of fourth enclose.

6. The submerged rut testing attachment of claim 5, wherein: the first fixing clip (301), the second fixing clip (302), the third fixing clip (303) and the fourth fixing clip (304) are all made of metal materials.

7. The submerged rut testing attachment of claim 1, wherein: and water or saline solution is injected into the first groove to form a water immersion test environment.

8. The submerged rut testing attachment of claim 7, wherein: the liquid level of the water or the solution is higher than the top surface of the rut plate test piece mold (4).

9. A submerged rut testing attachment according to any one of claims 1 to 8, wherein: the base (1) is made of metal.

10. A method of testing a submerged rut testing attachment according to any one of claims 1 to 9, comprising the steps of:

preparing an asphalt mixture, pouring the asphalt mixture into a track plate test piece mold 4 for compaction molding to prepare an asphalt concrete track plate test piece 5, and curing;

installing an assembly of a rut plate test piece mold 4 and a rut plate test piece 5 in a first groove of the submerged rut test auxiliary device, and then installing the submerged rut test auxiliary device in a rut tester;

electrifying the rut tester, opening temperature control, filling liquid into the first groove to form a water immersion environment, and immersing the top of the rut plate test piece mold 4 by the liquid;