阅读说明：本技术 一种高温疲劳试验装置及其树脂混凝土高温疲劳试验方法 (High-temperature fatigue test device and resin concrete high-temperature fatigue test method thereof ) 是由 徐速 徐斌 尤其 李德可 赵宏雨 刘佳 于 2021-08-16 设计创作，主要内容包括：本发明提供一种高温疲劳试验装置及其树脂混凝土高温疲劳试验方法。针对现有疲劳试验方法在测试树脂混凝土铺装结构时精度不足、尺寸种类少、温度不可控等问题,本发明提供一种包括安装部、固定部、施力部的高温疲劳试验装置及其试验方法,通过将树脂混凝土铺装于安装部之上,固定部根据安装部的大小固定安装部,施力部设定温度和载荷并作用于树脂混凝土铺装结构时间,从而达到对设定尺寸的树脂混凝土铺装结构试件在设定温度和设定频率、振幅载荷下的高精度疲劳试验。(The invention provides a high-temperature fatigue test device and a resin concrete high-temperature fatigue test method thereof. The invention provides a high-temperature fatigue test device and a high-temperature fatigue test method for a resin concrete pavement structure, aiming at the problems of insufficient precision, few size types, uncontrollable temperature and the like when the existing fatigue test method is used for testing the resin concrete pavement structure.)

1. A high temperature fatigue test device, characterized by comprising:

a fixed part;

a mounting portion disposed above the fixing portion;

and the force application part is arranged on the mounting part.

2. The high temperature fatigue test apparatus of claim 1, wherein the mounting portion comprises:

a base plate;

the stress baffle plates are arranged at least two and are connected to the bottom plate.

3. The high temperature fatigue test apparatus of claim 1, wherein the fixing portion comprises:

a support plate;

the number of the carrier roller parts is at least 4, and the carrier roller parts are positioned on the supporting plate;

a roller shaft disposed over the idler member;

the limiting bolt is positioned between the carrier roller component and the roller shaft;

and two ends of the limiting baffle are respectively connected to the carrier roller component.

4. The high temperature fatigue test apparatus of claim 1, wherein the force application portion comprises a power portion, a connecting shaft and a force application member.

5. A resin concrete high-temperature fatigue test method using the high-temperature fatigue test apparatus according to any one of claims 2 to 4, characterized by comprising the steps of:

s10: carrying out rust removal treatment on the bottom plate;

s20: coating a resin waterproof adhesive on the surface of the bottom plate;

s30: laying resin concrete;

s40: assembling the high-temperature fatigue test device;

s50: and (6) loading and testing.

6. The resin concrete high-temperature fatigue test method according to claim 5, wherein the rust removal treatment enables the surface roughness of the bottom plate to reach 50-100um and the cleanliness to reach Sa2.5.

7. The resin concrete high temperature fatigue test method according to claim 5, wherein the amount of the resin waterproof adhesive is 0.1-1.0kg/m²。

8. The resin concrete high-temperature fatigue test method according to claim 5, wherein the resin concrete is laid so that the resin concrete is placed on the floor after being mixed.

9. The resin concrete high-temperature fatigue test method according to claim 8, wherein the laying of the resin concrete comprises the steps of:

s10: a detachable baffle is arranged on the bottom plate;

s20: placing a strength structure in the detachable baffle, and spraying the resin waterproof adhesive;

s30: placing resin concrete in a space formed by the detachable baffle plate and the bottom plate;

the strength structure includes a rebar mesh.

10. The resin concrete high-temperature fatigue test method according to claim 5, wherein the loading comprises at least one of pneumatic loading and hydraulic loading, and the test comprises loading sinusoidal cyclic loading and temperature control.

Technical Field

The invention relates to the field of bridge engineering tests, in particular to a high-temperature fatigue test device and a resin concrete high-temperature fatigue test method thereof.

Background

The pavement structure is used as an important structure for protecting the steel bridge deck, and the cooperative deformation capability with the steel bridge deck and the fatigue cracking resistance of the pavement layer are important factors influencing the service life of the pavement layer and the steel bridge deck under repeated load. Although the existing fatigue test method is applicable to more paving materials, the higher the universality is, the lower the precision is, and the test requirement of a specific material cannot be met. Along with the continuous deepening of pavement structure research, the size of the fatigue test piece needs to be changed constantly to adapt to different structural requirements, so that the fatigue test piece under the structure has more representativeness and can be closer to the actual stress and response condition of the original bridge deck. Meanwhile, the fatigue test at high temperature also provides certain challenges for the traditional fatigue test method. For resin concrete, the diversity of pavement structures and the particularity of materials of the resin concrete enable the traditional fatigue test method not to meet the requirement of the resin concrete fatigue test, so that a high-temperature fatigue test method for the resin concrete is urgently needed.

Disclosure of Invention

Therefore, the invention provides a high-temperature fatigue test device and a resin concrete high-temperature fatigue test method, which effectively solve the problems of insufficient fatigue test precision, small size variety, uncontrollable temperature and the like of a resin concrete pavement structure.

A high temperature fatigue test apparatus, comprising: the installation part is arranged on the fixing part, and the force application part is arranged on the installation part. The installation department is used for mating formation the resin concrete structure test piece of mating formation, and the fixed part is used for fixed resin concrete structure test piece of mating formation, and application of force portion is used for testing the resin concrete test piece. When the high-temperature fatigue device is used, firstly, the resin concrete pavement is paved on the installation part according to the designed preparation method, after the resin concrete is cured to the time set by the test, the installation part with the resin concrete pavement is placed on the fixing part, the fixing part fixes the installation part according to the designed size, and then the force application part tests according to the force, the frequency and the like designed by the fatigue test. Through setting up the installation department on the fixed part, can make resin concrete mat formation and ground or test platform have certain clearance, when application of force portion examined like this, can set up resin concrete and mat formation and have certain deformation, richened size, kind and the state that resin concrete of test paved.

Further, the installation department includes atress baffle, bottom plate, and the atress baffle is provided with at least two, atress baffle connect in the bottom plate. When the installation department used, the bottom plate mainly acted as the effect of the bridge floor steel sheet in the resin concrete structure of mating formation, and the size of the resin concrete that the size of bottom plate can be based on fatigue test design was mated formation and is selected and adjusted, can test the resin concrete of different size and dimension and mate. The number of the stress baffles is 2, the stress baffles are connected to two ends of one side of the bottom plate opposite to the resin concrete pavement, if the resin concrete pavement size is large, the stress baffles can be connected with 3-5 stress baffles, and the stress baffles enable the resin concrete pavement structure test piece to be hung on the fixing part in a hollow mode. When laying resin concrete and mating formation, still can use the detachable baffle, the size, shape, thickness etc. that can control resin concrete mating formation structure test piece can be dismantled to the detachable baffle, before mating formation, will dismantle the baffle and set up in the bottom plate that needs carry out resin concrete mating formation one side, settle detachable baffle according to size, the shape of design, then carry out laying of resin concrete mating formation.

Further, the fixing part comprises a supporting plate, limiting bolts, carrier roller parts, a roller shaft and limiting baffle plates, the number of the carrier roller parts is at least 4, the carrier roller parts are located on the supporting plate, the roller shaft is arranged on the carrier roller parts, the limiting bolts are located between the carrier roller parts and the roller shaft, and two ends of the limiting baffle plates are respectively connected to the carrier roller parts. The support plate plays a role in supporting the whole test device. The carrier roller component has the main function that a certain gap is formed between the support mounting part and the support plate, and if the resin concrete pavement is particularly thick, the height of the carrier roller component can be increased so as to lift the mounting part; the idler parts can also define the rotation direction of the roller shaft and the position of the fixed roller shaft, generally 4 idler parts are arranged at four corner positions of the supporting plate, and the rotation direction of the roller shaft is set to be parallel motion on the same straight line. The roller can be followed self curved surface and rolled, does not provide the moment of flexure, and simultaneously, the roller still can provide direct supporting role for the installation department, is roller and atress baffle direct contact usually, and the roller removes the atress baffle through rotating to realize the removal that resin concrete laid, when fatigue test, can detect the position of laying different, increased fatigue test's detection kind, make the detection that arrives more accurate. The limiting bolt is used for limiting rotation of the roll shaft and preventing pavement from sliding during fatigue test. The limiting baffle is used for further fixing the resin concrete pavement structure test piece, mainly fixes the side surface of resin concrete pavement, limits the longitudinal movement range of the resin concrete pavement structure test piece, and can also install the limiting baffle around the side piece of resin concrete pavement if the experimental acting force is very large, so that the resin concrete pavement structure test piece is fixed without moving on a large scale, and the accuracy and precision of detection data are ensured.

Further, the force application part comprises a power part, a connecting shaft and a force application piece. The power part provides acting force with various sizes, strengths, frequencies, directions and the like, one end of the connecting shaft is connected with the power part, the other end of the connecting shaft is connected with different kinds of force application pieces, and the acting force with various sizes, strengths, frequencies, directions and the like can be applied to the resin concrete pavement through the force application pieces through the connection of the connecting shaft. The force application member is used for directly contacting with the resin concrete pavement structure, and the shape, the size and other conditions of the contact surface with pavement can be selected according to different test conditions and different design requirements of the force application member on shape, size and other conditions. Therefore, various combined acting forces, contact shapes and the like can be designed during fatigue tests, the detection range is expanded, and the detection accuracy and precision are improved.

The invention also provides a resin concrete high-temperature fatigue test method using the high-temperature fatigue test device, which comprises the following steps:

s10: carrying out rust removal treatment on the bottom plate;

s20: coating resin waterproof adhesive on the surface of the bottom plate;

s30: laying resin concrete;

s40: assembling a high-temperature fatigue test device;

s50: and (6) loading and testing.

The base plate is used as a steel plate of a bottom layer of the resin concrete pavement, so the base plate usually selects the steel plate or a steel plate substitute, when the resin concrete pavement is carried out, the steel plate is usually derusted firstly, then resin waterproof binder is coated, then the resin concrete layer on the base plate is paved, according to different designs, the resin concrete can be in a single-layer or multi-layer structure, and the steps S10-S30 are carried out on the resin concrete pavement according to actual pavement to carry out simulated pavement, so that the pavement environment is restored as much as possible. When the installation part is paved, if the environment needing to be detected is under a high-temperature condition, namely, the installation part is placed under the high-temperature environment for paving. In step S40, the fatigue testing device is mounted with the fixing portion on the bottom, the mounting portion on the fixing portion, and the biasing portion on the mounting portion in this order. In step S50, the fatigue test is performed by controlling the urging portion on the assembled high-temperature fatigue test apparatus, and the temperature of the test may be set or changed during the test.

Further, the surface roughness of the steel plate reaches 50-100um through derusting treatment, and the cleanliness reaches Sa2.5. The roughness and the cleanliness of the steel plate have certain influence on the cohesiveness of the pavement structure, and if the roughness and the cleanliness of the steel plate do not meet related standards, the resin concrete pavement which is paved is easy to fall off or slide from the steel plate, so that the accuracy and the accuracy of the test are influenced.

Further, the dosage of the resin waterproof binder is 0.1-1.0kg/m². The resin waterproof binder is mainly used for performing anticorrosive treatment on the bottom plate and increasing the bonding between the bottom plate and the upper layer pavement. The amount of the waterproof adhesive is controlled so that the adhesive is not too thin to be uncoated or too thick to affect the performance of the upper layer.

Further, the resin concrete is laid so that the resin concrete is placed on the floor after being mixed. The scheme of the fatigue test to be carried out on the bottom plate is paved according to the designed paving materials, sequence, time and the like, after the resin concrete pavement is paved, the relevant parts of the resin concrete pavement in the curing state of the fatigue test to be carried out are selected for carrying out the fatigue test, and the test can also select and change the temperature.

Further, the laying of the resin concrete comprises the following steps:

s10: a detachable baffle plate is arranged on the bottom plate;

s20: placing the strength structure in a detachable baffle, and spraying a resin waterproof binder;

s30: placing resin concrete in a space formed by the detachable baffle plate and the bottom plate;

wherein the strength structure comprises a steel mesh.

The detachable baffle is arranged and mainly used for controlling the shape of resin concrete pavement, and most of materials for resin concrete pavement are fluid, so that the shape is not fixed during pavement, and the materials need to be fixed by the detachable baffle. The strength structure is a structure frequently used in resin concrete pavement, mainly comprises a reinforcing mesh, glass fiber cloth and the like, and can improve the performances of toughness, strength and the like of resin concrete pavement. The waterproof resin adhesive is sprayed on the strength structure, which is mainly a material considering that most of the strength structures contain metal and need to be subjected to waterproof treatment, and the strength structure is arranged between the uppermost layer and the lowermost layer of the resin concrete pavement, and the waterproof adhesive is sprayed on the strength structure, so that the waterproof performance of the bottom plate can be improved. Finally, resin concrete is placed in a space formed by the bottom plate and the detachable baffle plate, the resin concrete can be poured into the space once for single-layer or two-layer paving, and the resin concrete with different material proportions is poured into the space for multiple times for multi-layer paving.

Further, the loading comprises at least one of pneumatic loading and hydraulic loading, and the test comprises loading sinusoidal cyclic loading and temperature control. The loading mode of the power part is diversified, and the power part can be matched with various instruments for testing. The frequency and amplitude of the sinusoidal cyclic load can be adjusted according to the performance parameters of the test piece.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic view of a high temperature fatigue test apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic view of a mounting portion according to an embodiment of the present invention.

FIG. 3 is a schematic view of a fixing portion according to an embodiment of the invention.

FIG. 4 is a schematic view of a force application portion according to an embodiment of the present invention.

FIG. 5 is a graph comparing the test results of examples of the present invention.

Description of reference numerals:

the method comprises the following steps of 1-a bottom plate, 2-a stress baffle, 3-resin concrete pavement, 4-a force application part, 5-a roller shaft, 6-a carrier roller part, 7-a limiting bolt, 8-a limiting baffle and 9-a supporting plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

[ example 1 ]

As shown in fig. 1 and fig. 2, the present embodiment provides a high temperature fatigue test apparatus, which includes a bottom plate 1, a force-receiving baffle 2, a force-applying portion, and a fixing portion. Two ends of the bottom plate 1 are connected with stressed baffles 2. When in use, the other side of the bottom plate 1 connected with the stressed baffle 2 is paved with designed resin concrete, which can be one layer or a plurality of layers. After the paving is finished, waiting for a period of time, after the resin concrete is paved and cured, placing the stressed baffle 2 upwards, paving the stressed baffle downwards on the fixed part, fixing the bottom plate 1, loading stress on the stressed baffle through the force application part, and controlling the temperature of the test.

[ example 2 ]

As shown in fig. 1 and 3, the present embodiment provides the same high-temperature fatigue test apparatus, which includes a roller shaft 5, a carrier roller member 6, a limit bolt 7, a support plate 9, an installation portion, and a force application portion. The 4 idler parts 6 are respectively arranged at the four corners of the rectangular supporting plate 9, and the directions of the 4 idler parts 6 are controlled to be consistent. 4 roll shafts 5 are respectively placed on the upper parts of the idler members 6. After the resin concrete is laid on the mounting portion, the mounting portion is placed on the roller shaft 5, and the mounting portion is moved by the roller shaft 5 to be placed at a position where a fatigue test is performed. The roller shaft 5 is fixed by a stopper bolt 7 so as not to roll, and the mounting portion thereof is not moved. The fatigue test was started by applying a biasing member to the mounting portion.

[ example 3 ]

As shown in fig. 1 and 4, the present embodiment provides a high temperature fatigue test apparatus, which includes a power portion, a connecting shaft, a biasing member 4, a mounting portion, and a fixing portion. And paving resin concrete on the mounting part for pavement, and fixing the mounting part on the fixing part after the resin concrete is paved and cured. The power unit is provided with the frequency and amplitude of the load, and the urging element 4 and the power unit are connected by a connecting shaft. The force application member 4 was placed in contact with the resin concrete pavement to start the fatigue test.

[ example 4 ]

As shown in fig. 1, fig. 2, fig. 3, and fig. 4, the present embodiment provides a high temperature fatigue test apparatus, which includes a bottom plate 1, a force-bearing baffle 2, a resin concrete pavement 3, a force-applying member 4, a roller shaft 5, a roller member 6, a limit bolt 7, a limit baffle 8, a support plate 9, and a detachable baffle. Wherein bottom plate 1, atress baffle 2, resin concrete pavement 3 and can dismantle the baffle and constitute the installation department, as shown in fig. 2, atress baffle 2 welds respectively at the both ends of bottom plate 1, can dismantle the baffle and set up in the another side of bottom plate 1, pours the resin concrete material into the space that can dismantle baffle and bottom plate 1 and constitute, treats that resin concrete solidifies the back, demolishs and can dismantle the baffle, obtains resin concrete pavement structure test piece. The roller shaft 5, the carrier roller parts 6, the limiting bolts 7, the limiting baffle 8 and the supporting plate 9 form a fixing part, as shown in fig. 3, 4 carrier roller part positions 6 are respectively arranged on four end points of the supporting plate 9, the roller shaft 5 is arranged on each carrier roller part 6, and the limiting bolts 7 are arranged between the carrier roller parts 6 and the roller shafts 5. The installation part is placed on the fixing part, two ends of the stress baffle 2 are respectively supported by the two roll shafts 5, two ends of the limit baffle 8 are respectively connected to the carrier roller part 6, and longitudinal movement of the installation part is limited. During the test, the force application piece 4 is directly contacted with the bottom plate 1 to carry out the fatigue test.

[ example 5 ]

The embodiment also provides a resin concrete high-temperature fatigue test method, which comprises the following steps:

s10: selecting a steel plate with proper size as the bottom plate 1, and performing shot blasting treatment on the steel plate to ensure that the surface roughness of the steel plate reaches 50-100 mu m and the cleanliness reaches Sa2.5.

S20: and (3) coating resin waterproof adhesive on the surface of the base plate 1 to form the resin waterproof adhesive layer, wherein the dosage of the resin waterproof adhesive is 0.1-1.0kg/m 2.

S30: and pouring the mixed resin concrete into a space formed by the bottom plate 1 and the detachable baffles, detaching the detachable baffles after the resin concrete is molded and maintained, and forming a resin concrete pavement structure test piece by the bottom plate 1, the stressed baffles 2 and the resin concrete pavement 3.

S40: the resin concrete pavement structure test piece is placed on the fixing piece, the roller shaft 5 is fixed by the limiting bolt 7, and the resin concrete pavement 3 is fixed by the limiting baffle 8, so that the longitudinal movement range of the resin concrete pavement structure test piece is widened.

S50: connecting the force application member 4 in a fatigue testing machine with a temperature control system, placing a resin concrete pavement structure test piece, setting temperature and load, pneumatically loading sinusoidal cyclic load, applying transverse linear stress to the center of the test piece through the force application member 4, and only providing supporting force on two sides of the test piece.

[ example 6 ]

The embodiment also provides a resin concrete high-temperature fatigue test method, which comprises the following steps:

s10: selecting a steel plate with proper size as the bottom plate 1, and performing shot blasting treatment on the steel plate to ensure that the surface roughness of the steel plate reaches 50-100 mu m and the cleanliness reaches Sa2.5.

S20: and (3) coating resin waterproof adhesive on the surface of the base plate 1 to form the resin waterproof adhesive layer, wherein the dosage of the resin waterproof adhesive is 0.1-1.0kg/m 2.

S30: set up the cushion on bottom plate 1, arrange the reinforcing bar net piece in can dismantling the baffle, the waterproof binder of spraying resin will mix the resin concrete placement in the space of compriseing bottom plate 1 and can dismantling the baffle, wait until resin concrete shaping, maintenance finish the back, demolish and can dismantle the baffle, bottom plate 1, atress baffle 2, resin concrete pavement 3 constitute resin concrete pavement structure test piece.

S40: the resin concrete pavement structure test piece is placed on the fixing piece, the roller shaft 5 is fixed by the limiting bolt 7, and the resin concrete pavement 3 is fixed by the limiting baffle 8, so that the longitudinal movement range of the resin concrete pavement structure test piece is widened.

S50: connecting the force application member 4 in a fatigue testing machine with a temperature control system, placing a resin concrete pavement structure test piece, setting temperature and load, hydraulically loading a sinusoidal cyclic load, applying transverse linear stress to the center of the test piece through the force application member 4, and only providing supporting force on two sides of the test piece.

In this embodiment, 10 sets of high temperature fatigue tests were performed on the resin concrete by using a conventional fatigue test method and the above resin concrete high temperature fatigue test method, where test method 1 is a conventional fatigue test method, and test method 2 is the above resin concrete high temperature fatigue test method. The test results are shown in table 1, table 2 and fig. 5, table 1 is the fatigue test results, table 2 is the data analysis of the fatigue test results, and fig. 5 is a comparison graph of the test results.

TABLE 1 fatigue test results

TABLE 2 fatigue test results data analysis

Statistical index	Test method 1	Test method 2
			Mean number of	5061324	4964275
Standard deviation of	588509	118525
			Extreme difference	1586853	394195

It can be known from table 2 and fig. 5 that the test result has a wide variation range when the resin concrete pavement structure test piece is tested by using the traditional fatigue test method, and the standard deviation is about 1/5 of the standard deviation of the traditional fatigue test method when the resin concrete high-temperature fatigue test method of the invention is used, so that the test result of the resin concrete high-temperature fatigue test method of the invention is more accurate.

[ example 7 ]

The embodiment also provides a resin concrete high-temperature fatigue test method, which comprises the following steps:

s10: selecting a steel plate with proper size as the bottom plate 1, and performing shot blasting treatment on the steel plate to ensure that the surface roughness of the steel plate reaches 50-100 mu m and the cleanliness reaches Sa2.5.

S20: and (3) coating resin waterproof adhesive on the surface of the base plate 1 to form the resin waterproof adhesive layer, wherein the dosage of the resin waterproof adhesive is 0.1-1.0kg/m 2.

S30: pouring the mixed resin concrete into a space formed by the bottom plate 1 and the detachable baffles to form lower-layer pavement, arranging glass fiber cloth on the lower-layer pavement, spraying resin waterproof binder, pouring resin concrete on the lower-layer pavement, and detaching the detachable baffles after the resin concrete is molded and cured, so that the bottom plate 1, the stressed baffles 2 and the resin concrete pavement 3 form a resin concrete pavement structure test piece.

S40: the resin concrete pavement structure test piece is placed on the fixing piece, the roller shaft 5 is fixed by the limiting bolt 7, and the resin concrete pavement 3 is fixed by the limiting baffle 8, so that the longitudinal movement range of the resin concrete pavement structure test piece is widened.

S50: connecting the force application member 4 in a fatigue testing machine with a temperature control system, placing a resin concrete pavement structure test piece, setting temperature and load, pneumatically loading sinusoidal cyclic load, applying transverse linear stress to the center of the test piece through the force application member 4, and only providing supporting force on two sides of the test piece.

Finally, it should be noted that: the above examples are only intended 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, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.