WO2023231174A1

WO2023231174A1 - Test method for crushed stone scatter ratio of bituminous surface treatment pavement, and test device thereof

Info

Publication number: WO2023231174A1
Application number: PCT/CN2022/110289
Authority: WO
Inventors: 周艳东
Original assignee: 中交一公局集团有限公司; 中交一公局集团有限公司海外分公司
Priority date: 2022-06-02
Filing date: 2022-08-04
Publication date: 2023-12-07
Also published as: CN115287983A; CN115287983B

Abstract

A test method for a crushed stone scatter ratio of a bituminous surface treatment pavement, and a test device thereof, which belong to the quality testing field of bituminous surface treatment pavement. The test method comprises: preparing a second layer (6) with a limited area on a surface of a first layer (5) to serve as a sampling layer, and performing standard sand consumption testing on the sampling layer to obtain standard sand consumption m0; constructing the second layer (6) on the surface of the first layer (5) outside the sampling layer, and performing standard sand consumption testing on the second layer (6) before and after a period during which the road is open to traffic with a speed limit, so as to obtain standard sand consumptions m1 and m2; and comparing the standard sand consumptions m0 and m1 and/or standard sand consumptions m0 and m2 to obtain the crushed stone scatter ratio of the bituminous surface treatment pavement. The test method not only avoids the error caused by using a manual method to strip off a crushed stone material to evaluate the crushed stone retention ratio of a surface treatment pavement, improves measurement accuracy and standardization, and meanwhile, the method has simple testing and convenient operation.

Description

A testing method and testing device for the loss rate of gravel on asphalt surface pavement

Technical field

The invention belongs to the field of quality testing of asphalt surface pavement, and in particular relates to a testing method and a testing device for the gravel loss rate of asphalt surface pavement.

Background technique

Asphalt gravel surface pavement is a form of pavement structure, which includes one or more layers of asphalt layer structure containing gravel. The asphalt gravel surface pavement is constructed using the layer paving method, and because of its simple construction and low cost, it is widely used in Commonly used in most countries in Africa. Taking the double-layer asphalt gravel surface pavement as an example, the construction steps are as follows: first spread the first layer of asphalt, and then spread the first layer of gravel. After rolling and curing, continue to spread the second layer of asphalt and the second layer of gravel. , after rolling and curing, it is opened to traffic to form a road surface on the asphalt gravel surface. Based on the above construction method, this type of pavement is prone to the following construction quality problems: the adhesion of gravel and asphalt requires a certain period of rolling to gradually become firmly bonded. Therefore, the gravel is easily lost during the rolling and maintenance period. Finally, the surface of the asphalt gravel surface is prone to oil spillage.

The loss of gravel from asphalt surface pavement significantly affects the service life and service level of asphalt pavement. For double-layer asphalt gravel surface pavement, the gravel loss rate is a key factor affecting the service life of the pavement. In the existing measurement method for the loss of road gravel on the surface of asphalt gravel, some engineers use manual methods to peel off the gravel material on the surface of the formed asphalt to evaluate the retention rate of the surface road gravel. There is a certain error in the amount of gravel collected by this method, which affects the accuracy of the test results and results in poor measurement results.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for testing the loss rate of gravel on asphalt surface pavement, which can be quantified and has accurate measurement results.

In order to achieve the above objects, the present invention provides the following technical solutions:

A method for testing the gravel loss rate of asphalt surface pavement. The asphalt surface pavement includes a first layer and a second layer located on the surface of the first layer. Both the first layer and the second layer are rolled The pressure is adhered to the gravel; the test method includes the following steps:

Make a second layer with a limited area on the surface of the first layer as a sampling layer, conduct a standard sand consumption test on the sampling layer, and obtain the standard sand consumption m0;

Construct a second layer on the surface of the first layer outside the sampling layer, and perform a standard sand consumption test on the second layer before and after the speed limit opening traffic period to obtain standard sand consumption m1 and m2;

Compare the standard sand consumption m0, m1 and/or the standard sand consumption m0, m2 to obtain the road gravel loss rate on the asphalt surface.

As mentioned above, the method for testing the gravel loss rate of asphalt surface pavement is further preferably, the standard sand consumption test includes the following steps:

Set up a measurement area with the same height as the second layer, with the surface to be measured as the bottom surface, and

The measurement area is filled with standard sand and the filling amount of the standard sand is calculated. The filling amount of the standard sand is the standard sand consumption of the second layer surface.

As mentioned above, the method for testing the loss rate of gravel on asphalt surface pavement is further preferably set up with the surface to be measured as the bottom surface and surrounding a measurement area with the same height as the second layer, including:

Place a measurement ring with the same height as the second layer on the surface to be measured;

Close the gap between the measurement ring and the surface to be measured.

As mentioned above, the method for testing the loss rate of pavement gravel on the asphalt surface is further preferably filled with standard sand in the measurement area and calculating the filling amount of the standard sand including:

Weigh the standard sand of preset quality;

Fill the standard sand into the measurement area until the upper surface of the standard sand is flush with the upper surface of the measurement ring;

Weigh the remaining standard sand mass and calculate the standard sand consumption.

As mentioned above, the test method for the gravel loss rate of the asphalt surface pavement is further preferably: the calculation of the gravel loss rate of the asphalt surface pavement based on the standard sand consumption m0, m1, m2 includes:

The gravel loss rate V1=(m1-m0)/m0 when laying the second layer;

After the speed limit opening traffic period, the gravel loss rate of the second layer relative to the sampling layer is V2 = (m2-m0)/m0.

Another aspect of the present invention also provides a device for testing the loss rate of gravel on asphalt surface pavement, which is used in the above-mentioned test method for the loss rate of gravel on asphalt surface pavement, including:

A measuring ring having a through cavity;

Measuring platform, the measuring platform is a plate-like structure provided with a central hole, and the measuring platform is sleeved on one end of the measuring ring;

The total height of the measurement ring and the measurement platform is the same as the height of the second layer.

As for the asphalt surface pavement gravel loss rate testing device as described above, it is further preferred that the measurement ring includes a positioning ring and an adjustment ring that are nested with each other, the positioning ring is fixedly connected to the measurement platform, and the adjustment ring Adjustable connection to the measuring platform.

The asphalt surface pavement gravel loss rate testing device as described above further preferably further includes a plurality of adjusters, and the plurality of adjusters are arranged along the circumference of the measurement ring; the adjusters include a threaded rod and Adjusting nut, the lower end of the threaded rod is connected to the adjusting ring, the upper end is worn on the measuring platform, and the adjusting nut is set on the threaded rod above the measuring platform.

In the asphalt surface pavement gravel loss rate testing device as described above, it is further preferred that the adjustment ring is a circular ring or a polygonal ring.

According to the asphalt surface road gravel loss rate testing device as described above, it is further preferred that the measurement platform is sleeved on the end periphery of the measurement ring, and the top surface of the measurement platform is in contact with the top surface of the measurement ring. flush; or

The end surface of the measurement ring is connected to the surface of the outer periphery of the central hole of the measurement platform.

Compared with the prior art, the present invention has the following beneficial effects:

By making a second layer with a limited area as a sampling layer and testing the standard sand consumption on the second layer before and after the speed limit opening traffic period, the gravel loss rate of the asphalt surface pavement was calculated based on the standard sand consumption obtained. , avoiding the errors caused by using manual methods to peel off gravel materials to evaluate the retention rate of surface road gravel, and improving the accuracy and standardization of measurement.

Description of the drawings

In order to more clearly explain the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description The drawings illustrate some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting any creative effort.

Figure 1 is a schematic diagram of the measurement change in the present invention, including a schematic structural diagram of a positioning ring, a measurement platform, and a regulator;

Figure 2 is a schematic diagram of the adjustment ring in the present invention.

Figure 3 is a schematic diagram of the asphalt surface road surface in the present invention.

Explanation of reference symbols:

1-Positioning ring, 2-Measuring platform, 3-Adjuster, 4-Adjusting ring, 5-First layer, 6-Second layer, 7-Gravel.

Detailed ways

The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limitations of the invention. Furthermore, the terms “first”, “second” and “third” are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. Connection, or integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the terms in the present invention can be understood on a case-by-case basis.

As shown in Figures 1-3, a specific embodiment of the present invention provides a method for testing the gravel loss rate of asphalt surface pavement, wherein the asphalt surface pavement at least includes a first layer 5 and a second layer located on the surface of the first layer 5 6. The second layer 6 is an asphalt layer with crushed gravel 7 adhered to it; this method mainly includes the following steps:

Make a second layer 6 of ^3m2 on the surface of the first layer 5 as a sampling layer, conduct a standard sand consumption test on the sampling layer, and obtain the standard sand consumption m0;

Construction of the second layer 6 on the surface of the first layer 5 outside the sampling layer, and a standard sand consumption test on the second layer 6 before and after the speed limit opening traffic period, to obtain the standard sand consumption m1, m2;

Compare the standard sand consumption m0, m1 and/or m0, m2 to obtain the road gravel loss rate on the asphalt surface.

Asphalt surface pavement is an asphalt pavement pavement structure that is widely used in Africa. According to the number of times of pouring asphalt and spreading gravel, it is divided into single-layer type, double-layer type and three-layer type. The most commonly used type is It is a double layer type. The pavement on the asphalt surface is constructed using the layer paving method. Taking the double-layer asphalt surface pavement as an example, the surface of the permeable oil layer (ground base layer) is first cleaned, then the first layer of asphalt viscous layer oil is poured, and then the first layer is spread After rolling and curing, the gravel will continue to be poured with a second layer of asphalt viscous layer oil, and then the second layer of gravel will be spread. After rolling and curing, it will be allowed to pass at a limited speed first, and then officially open to traffic, forming an asphalt gravel surface. pavement. The asphalt surface is a thin layer of the road surface on the asphalt surface, usually with a thickness of no more than 3cm. The gravel loss rate of the asphalt surface pavement is the gravel loss rate of the thin layer of the road surface on the asphalt surface.

In a specific embodiment of the present invention, the first layer 5 can be a base layer or an asphalt layer with the same structure as the second layer 6. When it is an asphalt layer, it can be one layer or multiple layers. layer; the second layer 6 is constructed directly on the surface of the first layer, so the lower surface of the second layer is in contact with the upper surface of the first layer 5.

In the above method, first select an area on the surface of the completed first layer and conduct construction sampling of the second layer to obtain a second layer with a limited area as the sampling layer, and then conduct a standard sand consumption test on the sampling layer. , the standard sand consumption m0 on the sampling layer is obtained. Next, the second layer of paving construction is carried out to obtain a complete asphalt gravel surface pavement with the first and second layers. During the construction process, after the second layer of gravel is spread, the local surface that lacks gravel and the The local surfaces where the gravel overlaps are uniformly treated to make the gravel evenly distributed, and then rolled with a tire roller to gradually adhere the gravel to the asphalt and stabilize it; before the above construction is completed and the speed limit is not opened to traffic, the second layer will be A standard sand consumption test is performed on the upper surface to obtain the standard sand consumption m1. Afterwards, a speed bump zone is set up on the road surface to restrict traffic vehicles from passing through, and the speed limit is opened to traffic for a period of time. After the speed limit and open traffic period, a standard sand consumption test is conducted on the upper surface of the second layer to obtain the standard sand consumption m2. Before conducting the standard sand consumption test, select a test location adjacent to the location where the standard sand consumption is tested before the speed limit is opened to traffic, and treat the surface of the test location to clean up the unadhered gravel floating on the surface, and then Start testing standard sand consumption.

The gravel loss rate of the asphalt surface pavement before and after the speed limit opening traffic period is calculated through m0, m1, and m2, and is compared to evaluate the quality of the asphalt surface pavement. Of course, in order to ensure the accuracy of m0, m1, and m2, the standard sand consumption m0, standard sand consumption m1, and standard sand consumption m2 can be obtained through multiple standard sand consumption tests and the average value of the tests.

The loss rate of gravel on the surface of the asphalt pavement is calculated based on the obtained standard sand consumption, which avoids the error caused by using manual methods to peel off the gravel material to evaluate the retention rate of the surface pavement, and improves the accuracy and standardization of the measurement. .

In a specific embodiment of the invention, the standard sand consumption test includes the following steps:

Set up a measurement area with the same height as the second layer 6 with the surface to be measured as the bottom surface. Fill the measurement area with standard sand and calculate the filling amount of standard sand. The filling amount of standard sand is the surface of the second layer 6. Standard sand consumption.

Before the measurement area of the surface to be tested is filled with standard sand, the surface should be treated first to clean up the unadhered gravel 7 on the asphalt surface, that is, the gravel 7 lost on the asphalt surface, and then start testing the standard sand. consumption.

In a specific embodiment of the present invention, filling the measurement area with standard sand and calculating the filling amount of the standard sand includes:

Weigh the standard sand of preset quality;

Fill the standard sand into the measurement area until the upper surface of the standard sand is flush with the upper surface of the measuring ring;

Weigh the remaining standard sand mass and calculate the standard sand filling amount.

Fill the standard sand into the measurement area until the upper surface of the standard sand is flush with the upper surface of the measurement ring. This is used as the filling amount of the standard sand. That is, the consumption of standard sand m0, m1, and m2 have a common filling reference. Measurement The results are accurate and the error is small.

In a specific embodiment of the present invention, the loss rate of gravel on the asphalt surface road calculated based on the standard sand consumption m0, m1, and m2 includes:

The gravel loss rate V1=(m1-m0)/m0 when laying the second layer;

The difference between m1 and m0 is the gravel mass lost in the second layer of 6 standard sand before the speed limit opening period. The ratio to m0 is used to evaluate the gravel loss rate of the asphalt surface pavement before the speed limit opening period. The difference between m2 and m0 is the gravel mass lost in the second layer of 6 standard sand after the speed limit opening traffic period. The ratio to m0 is used to evaluate the gravel loss rate of the asphalt surface pavement after the speed limit opening traffic period. By comparing the gravel loss rate of the asphalt surface pavement before and after the speed limit opening traffic period, the quality of the asphalt surface pavement was evaluated. The data of the loss rate that meets the requirements can be defined based on the gravel loss rate V1. Then, the difference between the gravel loss rate V2 and the gravel loss rate V1 can be used to determine the gravel loss condition of the road during the speed limit opening period. When the difference exceeds the technical specification After allowing the value, it can be judged that the surface road surface does not meet the requirements at this time.

Measuring ring, the measuring ring has a through cavity;

Measuring platform 2, the measuring platform 2 is a plate-like structure with a central hole, and the measuring platform is set on one end of the measuring ring;

The total height of the measuring ring and the measuring platform 2 is the same as the height of the second layer.

The measuring ring has a through cavity to receive the standard sand filled into it, and the measuring platform 2 is used to collect the remaining standard sand after the measuring ring is filled, to avoid errors caused by collecting the standard sand after spilling to the second layer surface.

In a specific embodiment of the present invention, the measurement ring includes a positioning ring 1 and an adjustment ring 4 that are nested with each other. The positioning ring 1 is fixedly connected to the measurement platform 2, and the adjustment ring 4 is adjustably connected to the measurement platform 2.

The positioning ring 1 fixes the measuring ring in the area to be measured, the adjusting ring 4 is adjustable and connected to the measuring platform 2, and the total height of the adjustable measuring ring is consistent with the height of the second layer surface.

In a specific embodiment of the present invention, it also includes multiple adjusters 3, which are arranged along the circumference of the measurement ring; the adjusters include a threaded rod and an adjusting nut, the lower end of the threaded rod is connected to the adjusting ring 4, and the upper end passes through Installed on the measuring platform 2, the adjusting nut is set on the threaded rod above the measuring platform 2.

The adjusting ring 4 and the measuring platform 2 are adjustably connected through the adjuster 3, and the height of the adjuster is raised or lowered through the threaded rod and the adjusting nut of the adjuster 3, thereby adjusting the total height of the measuring ring to be consistent with the height of the second layer surface.

In a specific embodiment of the present invention, the adjustment ring 3 is a circular ring or a polygonal ring.

In a specific embodiment of the present invention, the measurement platform 2 is sleeved on the end periphery of the measurement ring, and the top surface of the measurement platform 2 is flush with the top surface of the measurement ring.

In a specific embodiment of the present invention, the end surface of the measurement ring is connected to the surface of the periphery of the central hole of the measurement platform.

The limited area of the second layer 6 sampling layer can be 1m ² , 2m ² , or 3m ² , and the adjustment ring 4 is a polygon such as a circle or a square. In this embodiment, the limited area is 3m ² , and a circular ring is used as an example to illustrate the above. How to use the test device:

The positioning ring 1 is made of steel plate cutting, with an inner diameter of 40cm, an outer diameter of 40.2cm, and a height of 5mm. The upper part of the positioning ring 1 is equipped with a measurement platform 2. The outer diameter of the measurement platform 2 is 50cm. The wall thickness of the measurement platform 2 and the positioning ring 1 is 1mm. ; On the outside of the inner diameter of the positioning ring, close to the inner diameter wall, three adjusters 3 are provided, with a height adjustment range of 5-15mm. Adjustment ring 4 has upper and lower openings, a height of 6mm, a wall thickness of 0.5mm, an outer diameter of 39.5cm, and is connected to the regulator.

Set up a measurement area with the surface to be measured as the bottom surface, place the measurement ring and the adjustment ring 4 in this area, adjust the combined height of the measuring ring's positioning ring 1, adjuster 3 and adjuster 4 so that the combined height is equal to that of the second layer High, check the bottom condition around the positioning ring 1, and use putty to close the gap between the adjusting ring 4 and the second layer surface to avoid sand leakage.

Weigh 1000g of standard sand and spread it in the measuring ring with a measuring cup. The measuring cup is 200ml. Then use a steel ruler to scrape the standard sand until it is flush with the top of positioning ring 1. The steel ruler is 50cm long. Scrape the excess sand to the outside for measurement. On platform 2, recover and weigh, that is, calculate the filling amount m0 of standard sand.

Use the same method to measure the standard sand consumption m1 and m2 of the second layer 6 surface before and after the speed limit opening traffic period. The gravel loss rate on the asphalt surface before and after the speed limit opening traffic period is calculated through the formulas V1=(m1-m0)/m0 and V2=(m2-m0)/m0.

Compared with the existing testing methods for the retention rate of pavement gravel on asphalt surfaces, the above method has the following beneficial effects:

By weighing the preset mass of standard sand and weighing the remaining standard sand mass after filling the measurement area, the increased labor intensity of workers when collecting gravel is reduced, and the test method is simple and easy to operate.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, but not to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be equivalently replaced; and these modifications or substitutions do not deviate from the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present invention. scope.

Claims

A method for testing the gravel loss rate of asphalt surface pavement, which is characterized in that the asphalt surface pavement includes at least a first layer and a second layer located on the surface of the first layer, and the second layer is a rolling-bonded Asphalt layer with gravel attached; the test method includes the following steps:

Make a second layer with a limited area on the surface of the first layer as a sampling layer, conduct a standard sand consumption test on the sampling layer, and obtain the standard sand consumption m0;

Construct a second layer on the surface of the first layer outside the sampling layer, and perform a standard sand consumption test on the second layer before and after the speed limit opening traffic period to obtain standard sand consumption m1 and m2;

Compare the standard sand consumption m0, m1 and/or the standard sand consumption m0, m2 to obtain the road gravel loss rate on the asphalt surface.
The method for testing the loss rate of asphalt surface pavement gravel according to claim 1, wherein the standard sand consumption test includes the following steps:

Set up a measurement area with the same height as the second layer, with the surface to be measured as the bottom surface, and

The measurement area is filled with standard sand and the filling amount of the standard sand is calculated. The filling amount of the standard sand is the standard sand consumption of the second layer surface.
The method for testing the gravel loss rate of asphalt surface pavement according to claim 2, wherein the measurement area with the surface to be measured as the bottom surface and the same height as the second layer is surrounded by:

Place a measurement ring with the same height as the second layer on the surface to be measured;

Close the gap between the measurement ring and the surface to be measured.
The method for testing the loss rate of asphalt surface pavement gravel according to claim 2, wherein filling the measurement area with standard sand and calculating the filling amount of the standard sand includes:

Weigh the standard sand of preset quality;

Fill the standard sand into the measurement area until the upper surface of the standard sand is flush with the upper surface of the measurement ring;

Weigh the remaining standard sand mass and calculate the standard sand filling amount.
The method for testing the gravel loss rate of asphalt surface pavement according to claim 1, wherein the gravel loss rate of asphalt surface pavement calculated based on the standard sand consumption m0, m1, m2 includes:

The gravel loss rate V1=(m1-m0)/m0 when laying the second layer;

After the speed limit opening traffic period, the gravel loss rate of the second layer relative to the sampling layer is V2 = (m2-m0)/m0.
A device for testing the loss rate of gravel on asphalt surface pavement, which is characterized in that it is used in the test method for the loss rate of gravel on asphalt surface pavement in claims 1-5, including:

A measuring ring having a through cavity;

Measuring platform, the measuring platform is a plate-like structure provided with a central hole, and the measuring platform is sleeved on one end of the measuring ring;

The total height of the measurement ring and the measurement platform is the same as the height of the second layer.
The asphalt surface road gravel loss rate testing device according to claim 6, characterized in that the measurement ring includes a positioning ring and an adjustment ring that are nested with each other, and the positioning ring is fixedly connected to the measurement platform, so The adjustment ring is adjustably connected to the measurement platform.
The asphalt surface road gravel loss rate testing device according to claim 7, further comprising a plurality of regulators arranged along the circumferential direction of the measurement ring; the regulators include Threaded rod and adjusting nut, the lower end of the threaded rod is connected to the adjusting ring, the upper end is worn on the measuring platform, and the adjusting nut is set on the threaded rod above the measuring platform.
The asphalt surface road gravel loss rate testing device according to claim 6, characterized in that the adjustment ring is a circular ring or a polygonal ring.
The asphalt surface road gravel loss rate testing device according to claim 6, characterized in that the measurement platform is sleeved on the end periphery of the measurement ring, and the top surface of the measurement platform is in contact with the measurement ring. The top surface of the ring is flush; or the end surface of the measurement ring is connected to the surface of the outer periphery of the central hole of the measurement platform.