CN213842836U - Asphalt mixture rut test device - Google Patents
Asphalt mixture rut test device Download PDFInfo
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- CN213842836U CN213842836U CN202022681399.8U CN202022681399U CN213842836U CN 213842836 U CN213842836 U CN 213842836U CN 202022681399 U CN202022681399 U CN 202022681399U CN 213842836 U CN213842836 U CN 213842836U
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Abstract
The utility model discloses an asphalt mixture rut test device, which comprises a rut test host, wherein the rut test host comprises a test box, a control console, a base, a rolling wheel and a wheel driving part; the testing device also comprises an air conditioning component, a spraying system, a heating component and an ultraviolet light module which are electrically connected with the control console; the utility model has the advantages that: through the cooperation of wheel driving piece, air conditioning component, spraying system, heating element and ultraviolet ray module, couple multiple influence factors such as load, oxygen concentration, rainwater, temperature and ultraviolet ray, can simulate out the experimental environment similar with actual bituminous paving service environment, guarantee the accuracy of test result. The method can simulate the service rule of the asphalt pavement and assist the research personnel of the asphalt pavement to accurately regulate and design the asphalt pavement mixture.
Description
Technical Field
The utility model relates to a rut test technical field specifically indicates an asphalt mixture rut test device.
Background
Rutting is the permanent deformation of the asphalt pavement in the vertical direction caused by repeated rolling of the vehicle load, and the two sides of the severe rutting usually have convex deformation. The rutting is one of the main reasons for the reduction of the service performance of the asphalt pavement, and the data shows that the rutting accounts for 80% of the maintenance reasons of the asphalt pavement due to the occurrence of serious early diseases. The rutting experiment simulation device on the market at present only simulates the influence of different loads, temperatures or water environments on the rutting resistance of the asphalt mixture rutting test piece independently, and the actual service environment of the asphalt pavement is a relatively complex environment formed by coupling multiple influence factors such as load, temperature, ultraviolet rays, oxygen concentration, rainwater and the like; the existing rut experiment simulation device cannot couple the multiple influence factors to simulate a test environment similar to an actual service environment, so that the test result has deviation.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide an asphalt mixture rut testing device, which comprises a rut testing host, wherein the rut testing host comprises a testing box, a control console, a base, a rolling wheel and a wheel driving part; the wheel driving piece is connected with the rolling wheel and used for driving the rolling wheel to roll a track test piece arranged on the base; the testing device also comprises an air conditioning assembly, a spraying system, a heating assembly and an ultraviolet light module which are electrically connected with the control console;
the air conditioning assembly comprises an oxygen inlet nozzle, a nitrogen inlet nozzle and an exhaust nozzle, wherein one end of the oxygen inlet nozzle, one end of the nitrogen inlet nozzle and one end of the exhaust nozzle are respectively communicated with the test box; the other ends of the oxygen inlet nozzle and the nitrogen inlet nozzle are respectively connected with an oxygen source and a nitrogen source;
the spraying system comprises a spraying unit, a spraying pipe, a liquid storage tank and a circulating pump; the spraying units are uniformly arranged in the test box along the circumferential direction of the base; one end of the spray pipe is communicated with the spray unit, and the other end of the spray pipe is provided with a circulating pump and is communicated with the liquid storage tank;
the heating assembly comprises at least one heating device arranged in the test chamber;
the ultraviolet light module comprises at least one ultraviolet light emitting diode arranged in the test chamber.
Furthermore, the air conditioning assembly also comprises an oxygen concentration sensor and a nitrogen concentration sensor which are arranged in the test box; the oxygen inlet nozzle and the nitrogen inlet nozzle are respectively provided with an inlet valve, and the exhaust nozzle is provided with an exhaust valve; the air inlet valve, the exhaust valve, the oxygen concentration sensor and the nitrogen concentration sensor are respectively electrically connected with the console. The oxygen concentration sensor and the nitrogen concentration sensor are used for detecting the oxygen concentration and the nitrogen concentration in the test box, and the automatic control of the oxygen and nitrogen amount entering the test box is realized by combining the control console.
Further, the spraying unit comprises a spraying head, a hinged rod and a telescopic rod; a plurality of nozzles are arranged on the spray header; a liquid channel is arranged in the spray header; the spray header is connected with the spray pipe and a plurality of nozzles which are communicated with the liquid channel; one end of the hinge rod is hinged with the spray header, and the other end of the hinge rod is hinged with the inner wall of the test box; the telescopic link is parallel to the hinged rod, one end of the telescopic link is hinged to the inner wall of the test box, and the other end of the telescopic link is hinged to the spray header. Through the cooperation of telescopic link and hinge bar, its inclination is adjusted at certain inclination within range to steerable shower head to can simulate out the striking angle of rainwater and actual bituminous paving.
Further, the spray header is in an arc surface axle shoe shape and comprises an inner arc surface and an outer arc surface, and the inner arc surface is provided with a plurality of nozzles; the outer arc surface is connected with the hinged rod and the telescopic rod. Compared with a flat or strip spray head, the arc-surface axle-tile-shaped spray head can cover a wider spray area in a smaller space, and the spray effect is improved.
Further, a partition plate is arranged in the liquid storage tank; the inner cavity of the liquid storage tank is divided into a water purification area and a water return area by the partition plate; the circulating pump is arranged in the water purification area; the water purification area is communicated with the water return area through a filter screen; a liquid outlet is formed in the bottom of the test box; the liquid outlet is communicated with the water return area through a liquid outlet pipe; and a drain valve electrically connected with the console is arranged on the drain pipe. Through dividing the liquid reserve tank for water purification district and return water district to utilize the filter screen to filter the water in return water district, realize that the circulation of water sprays and uses the water economy resource.
Further, the liquid discharge ports are uniformly arranged along the circumferential direction of the base.
Further, the heating assembly also comprises a temperature sensor arranged in the test box; the heating device and the temperature sensor are respectively electrically connected with the console. The temperature sensor is used for monitoring the temperature inside the test box, so that the temperature in the test box can be controlled in real time.
Further, the wheel driving part comprises a sliding component horizontally arranged at the upper end of the rolling wheel; the sliding assembly is connected with the rolling wheel and the test box.
Further, the wheel driving part also comprises a pressing part arranged at the upper end of the rolling wheel. Apply to the rolling wheel through applying the casting die, can simulate out the different load environment of rolling wheel.
The utility model has the advantages that: through the cooperation of wheel driving piece, air conditioning component, spraying system, heating element and ultraviolet ray module, couple multiple influence factors such as load, oxygen concentration, rainwater, temperature and ultraviolet ray, can simulate out the experimental environment similar with actual bituminous paving service environment, guarantee the accuracy of test result. The method can simulate the service rule of the asphalt pavement and assist the research personnel of the asphalt pavement to accurately regulate and design the asphalt pavement mixture.
Drawings
Fig. 1 is a schematic structural view of the asphalt mixture rut testing device of the present invention.
Fig. 2 is a schematic perspective view of a spray unit in fig. 1.
Fig. 3 is a top cross-sectional partial structural schematic view of the showerhead of fig. 2.
Fig. 4 is a schematic top view of the arrangement of the plurality of spray units in fig. 1.
FIG. 5 is the comparison between the simulation and the actual measurement of the aging factor of the asphalt pavement in Hubei area.
FIG. 6 is the comparison between the simulation and actual measurement of the aging factor of asphalt pavement in Gansu area.
In the figure: the device comprises a test box 1, a control console 2, a base 3, a rolling wheel 4, a rut test piece 5, a pressing piece 6, a sliding component 7, a heat insulation layer 8, an oxygen inlet nozzle 9, a nitrogen inlet nozzle 10, an exhaust nozzle 11, an oxygen concentration sensor 12, a nitrogen concentration sensor 13, a spray pipe 14, a liquid storage box 15, a water purification area 15.1 and a water return area 15.2; circulating pump 16, baffle 17, filter screen 18, drain pipe 19, flowing back valve 20, temperature sensor 21, shower head 22, articulated rod 23, telescopic link 24, nozzle 25, flexible base 26, articulated head 27, liquid channel 28, heating device 29, ultraviolet ray module 30.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
The asphalt mixture rut test device shown in fig. 1-4 comprises a rut test host, wherein the rut test host comprises a test box 1, a control console 2, a base 3, a rolling wheel 4 and a wheel driving piece; the wheel driving piece is connected with the rolling wheel 4 and used for driving the rolling wheel 4 to roll a track test piece 5 arranged on the base 3; the testing device also comprises an air conditioning assembly, a spraying system, a heating assembly and an ultraviolet light module 30 which are electrically connected with the control console 2.
The method specifically comprises the following steps:
the wheel driving part comprises a sliding component 7 horizontally arranged at the upper end of the rolling wheel 4; the sliding assembly 7 is connected with the rolling wheel 4 and the test box 1. A vertical telescopic cylinder can be arranged at the upper end of the rolling wheel 4, the lower end of the telescopic cylinder is connected with the upper end of the rolling wheel 4, a top plate is arranged at the upper end of the telescopic cylinder, the upper end of the top plate is connected with a sliding block of the sliding assembly 7 in a sliding manner, for example, a sliding groove matched with the sliding block is arranged at the upper end of the top plate; the sliding assembly 7 further comprises a sliding rod piece, and the sliding rod piece is preferably a bidirectional telescopic cylinder; one end of the bidirectional telescopic cylinder is connected with the sliding block, and the other end of the bidirectional telescopic cylinder is connected with the inner wall of the test box 1. The setting direction of the bidirectional telescopic cylinder is parallel to the moving direction of the rolling wheel 4. In this embodiment, the sliding assemblies 7 are symmetrically arranged on two sides of the wheel shaft of the rolling wheel 4.
The wheel drive further comprises a pressing element 6 arranged at the upper end of the rolling wheel 4. The pressing member 6 can be a pressure cylinder or a jack, is vertically arranged at the upper end of the top plate and is used for applying downward pressure to the rolling wheel 4, so that the load of the rut test piece 5 is changed. The wheel driving member is electrically connected with the console 2, that is, the magnitude and duration of the downward pressure applied by the pressing member 6 are controlled by the console 2, and the sliding stroke and sliding duration of the sliding assembly 7 are controlled by the console 2.
The rut test piece 5 can be prepared by mixing steel slag and asphalt, such as: screening the steel slag according to the specification of T0302 in the Highway engineering aggregate test regulation (JTGE42-2005), and determining the mixing proportion of the steel slag and the asphalt mixture according to the specification of the asphalt pavement construction and acceptance Specification (GBJ 50092-96).
The rutting test piece 5 can also be prepared by weighing basalt, mineral powder and SBS modified asphalt according to the AC-13 grading (the oilstone ratio is 4.7%).
The air conditioning component comprises an oxygen inlet nozzle 9, a nitrogen inlet nozzle 10 and an exhaust nozzle 11, wherein one end of the oxygen inlet nozzle is respectively communicated with the test box 1; the other ends of the oxygen inlet nozzle 9 and the nitrogen inlet nozzle 10 are respectively connected with an oxygen source and a nitrogen source; the air conditioning assembly further comprises an oxygen concentration sensor 12 and a nitrogen concentration sensor 13 which are arranged inside the test chamber 1; the oxygen inlet nozzle 9 and the nitrogen inlet nozzle 10 are respectively provided with an inlet valve, and the exhaust nozzle 11 is provided with an exhaust valve; the air inlet valve, the air outlet valve, the oxygen concentration sensor 12 and the nitrogen concentration sensor 13 are respectively electrically connected with the console 2. The oxygen content in the test box 1 can be regulated and controlled by controlling the air inlet valves on the oxygen air inlet nozzle 9 and the nitrogen air inlet nozzle 10; and the ventilation of the gas inside the test chamber 1 or the readjustment of the oxygen content is realized through the exhaust valve to change the influencing factor of the oxygen concentration. In order to facilitate the uniform mixing of the oxygen and the nitrogen in the test chamber 1, the central axes of the oxygen inlet nozzle 9 and the nitrogen inlet nozzle 10 can intersect in the space in the test chamber 1, so that the oxygen and the nitrogen entering the test chamber 1 are uniformly mixed after being collided.
Referring to fig. 1 and 4, the spray system includes a spray unit, a spray pipe 14, a liquid storage tank 15, and a circulation pump 16. A clapboard 17 is arranged in the liquid storage tank 15; the inner cavity of the liquid storage tank 15 is divided into a water purification area 15.1 and a water return area 15.2 by a partition plate 17; the circulating pump 16 is arranged in the water purifying area 15.1; the water purification area 15.1 is communicated with the water return area 15.2 through a filter screen 18; the bottom of the test box 1 is provided with a liquid outlet; the liquid outlet is communicated with the water return area 15.2 through a liquid outlet pipe 19; the drain pipe 19 is provided with a drain valve 20 electrically connected to the console 2. The liquid discharge ports in this embodiment are uniformly arranged along the circumferential direction of the base 3. Through the control to flowing back valve 20, the content of the liquid in steerable proof box 1 is convenient for simulate out the environment that rut test piece 5 received the rainwater and soaks. The solution stored in the liquid storage tank 15 can be rainwater directly, or tap water or purified water can be used to add a small amount of sulfur to adjust the pH value of the solution so that the solution has characteristics closer to that of rainwater. Because baffle 17 separates liquid reserve tank 15 for water purification district 15.1 and return water district 15.2, but make the solution cyclic utilization in the liquid reserve tank 15, save water resource and cost, especially, when the solution is the rainwater in the liquid reserve tank 15, more need cyclic utilization in order to reduce the consumption of solution. Rainwater in the detection area corresponding to the rut test piece 5 can be collected. For example, when the service performance of the asphalt mixed pavement in a certain area in the north of lake needs to be detected, the rut test piece 5 is weighed according to the asphalt mixed pavement in the certain area, and rainwater in the certain area is collected to be used as the solution in the liquid storage tank 15.
The spraying units are uniformly arranged in the test box 1 along the circumferential direction of the base 3; one end of the spray pipe 14 is communicated with the spray unit, and the other end of the spray pipe 14 is provided with a circulating pump 16 and is communicated with the liquid storage tank 15. Referring to fig. 2, the spray unit includes a spray header 22, a hinge rod 23, and a telescopic rod 24; the spray header 22 is provided with a plurality of nozzles 25; a liquid channel 28 is arranged in the spray header 22; the spray header 22 is connected with a spray pipe 14 communicated with a liquid channel 28 and a plurality of nozzles 25; referring to fig. 2 and 3, one end of a hinged rod 23 is hinged with the spray header 22, and the other end of the hinged rod 23 is hinged with the inner wall of the test box 1; the telescopic link 24 is parallel to the hinged rod 23, one end of the telescopic link 24 is hinged to the inner wall of the test box 1, and the other end of the telescopic link 24 is hinged to the spray header 22.
Two ends of the telescopic rod 24 are respectively provided with a hinge joint 27, one hinge joint 27 is hinged with the spray head 22, the other hinge joint 27 is hinged with a telescopic base 26, and the telescopic base 26 is connected with the inner wall of the test box 1. The spray head 22 is in an arc surface axle bush shape, the spray head 22 comprises an inner arc surface and an outer arc surface, and the inner arc surface is provided with a plurality of nozzles 25; the outer arc surface is connected with a hinged rod 23 and a telescopic rod 24. When the spraying angle of the spraying head 22 needs to be adjusted, the control console 2 controls the telescopic rod 24 to stretch.
The heating assembly comprises at least one heating device 29 arranged in the test chamber 1; the heating assembly further comprises a temperature sensor 21 arranged in the test chamber 1; the heating device 29 and the temperature sensor 21 are electrically connected to the console 2, respectively. The heating devices 29 in this embodiment are disposed on two sides of the top of the inner layer of the test chamber 1, and a plurality of temperature sensors 21 are uniformly disposed on the inner wall of the test chamber 1. In order to improve the heat preservation effect, the inner wall of the test box 1 is also provided with a heat preservation layer 8. It should be noted that test box 1 can also communicate the heat sink in fact, and the heat sink includes conventional structures such as condenser, refrigeration cycle pipeline, heat exchanger, heat conduction spare, and the heat conduction spare is located 1 inner wall of test box in order to realize 1 inside and outside heat transfer (cooling promptly) of test box. The low-temperature environment can be simulated through the cooling device, and the cooling device is used for simulating the use performance of the asphalt mixture pavement in northern areas of China.
The uv module 30 includes at least one uv led disposed in the test chamber 1. The ultraviolet light emitting diode of the embodiment is arranged along the circumferential direction of the inner wall of the test chamber 1 and is positioned between the heating device 29 and the sliding component 7. The uv leds are also electrically connected to the console 2.
The console 2 of the present embodiment includes a control circuit board and control buttons, and the control portion of the control circuit board may be implemented by conventional means, which is not limited in the present embodiment.
The experimental parameters related to the test device of the embodiment mainly comprise rutting equivalent temperature, ultraviolet light intensity, oxygen content and rainfall. The rutting equivalent temperature is determined according to the thickness of an asphalt layer (rutting test piece 5), and the ultraviolet light intensity, the oxygen content and the rainfall are determined according to the annual average data of a simulation area. And the rolling time required by the simulated service life is calculated according to the daily average axle load times in the specific high-speed simulation life.
Referring to FIG. 5, taking a high-speed upper layer in Hubei as an example, the data is consulted to obtain the annual average temperature of 16.3 ℃ and the daily average ultraviolet light intensity of 147.31W/m2The ultraviolet radiation intensity of the simulation experiment device for the service performance of the asphalt pavement is 73W/m2The service life n is 1, 3, 4, 6, 8, 9 and 11 years, the annual rainfall is 1200mm, and the spraying rainfall simulated by the spraying system of the test device is 80 mm/d.
(1) And weighing basalt, mineral powder and SBS modified asphalt (the oil-stone ratio is 4.7%) according to the AC-13 grading, and forming the asphalt mixture rut test piece according to the standard requirement.
(2) According to the data of the simulated Hubei area, the ultraviolet light intensity, the oxygen content and the rainfall are respectively 147.31W/m220.9 percent and 1200mm, and obtaining corresponding rolling time of the rut test piece according to different service life.
(3) The temperature is 43.4 ℃, and the ultraviolet radiation intensity is 73W/m2The load of 0.7MPa and the spraying amount of 80mm/d are input into the test device of the embodiment, and the time corresponding to each factor is set through the console.
(4) Obtaining asphalt mixture rut test pieces with different simulation years, testing the aging factor (also called carbonyl factor) of the extracted asphalt by a Fourier change infrared spectrometer, and comparing the aging factor with the actually measured data of the actual pavement of the area, wherein the result is shown in figure 5.
Referring to FIG. 6, taking a high-speed upper layer of Gansu area as an example, the annual average temperature of the area is 19.1 ℃ and the annual UV irradiation intensity D is 184.37W/m2Asphalt pavement service performance simulation experiment deviceHas an ultraviolet radiation intensity of 73W/m2The service life n is 1, 4, 8, 10 and 12 years, the annual rainfall is 300mm, and the spraying rainfall simulated by the spraying system of the testing device is 80 mm/d.
(1) And weighing the SBS modified asphalt of basalt and mineral powder according to the AC-13 grade (the oil-stone ratio is 4.7%), and forming the asphalt mixture rut test piece according to the standard requirement.
(2) According to the data of the simulated Hubei area, the ultraviolet light intensity, the oxygen content and the rainfall are respectively 184.37W/m219.4 percent and 300mm, and obtaining corresponding rolling time of the rut test piece according to different service life.
(3) The temperature is 43.4 ℃, and the ultraviolet radiation intensity is 73W/m2The load of 0.7MPa and the spraying amount of 80mm/d were input to the test apparatus of this example, and the time corresponding to each factor was set.
(4) Obtaining asphalt mixture rut test pieces with different simulation years, testing the aging factor (also called carbonyl factor) of the extracted asphalt by a Fourier change infrared spectrometer, and comparing the aging factor with the actually measured data of the actual pavement of the area, wherein the result is shown in figure 6.
The test result shows that the relative error between the simulation value and the measured value of the service 11-year-old aging factor of the asphalt pavement in the Hubei area is 9.0 percent, and the relative error between the simulation value and the measured value of the service 12-year-old aging factor of the asphalt pavement in the Gansu area is 8.9 percent. The simulation accuracy of both places exceeds 90%, which indicates that the test device of the embodiment has higher reliability for the simulation of the service performance of the asphalt pavement in the two places.
Above only the utility model discloses an it is preferred embodiment, the utility model discloses a scope of protection not only limits in above-mentioned embodiment, and the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that a person skilled in the art should also recognize that several modifications and decorations can be made without departing from the principle of the present invention, and the protection scope of the present invention is also covered.
Claims (9)
1. An asphalt mixture rut test device comprises a rut test host, wherein the rut test host comprises a test box, a control console, a base, a rolling wheel and a wheel driving part; the wheel driving piece is connected with the rolling wheel and used for driving the rolling wheel to roll a track test piece arranged on the base; the method is characterized in that: the testing device also comprises an air conditioning assembly, a spraying system, a heating assembly and an ultraviolet light module which are electrically connected with the control console;
the air conditioning assembly comprises an oxygen inlet nozzle, a nitrogen inlet nozzle and an exhaust nozzle, wherein one end of the oxygen inlet nozzle, one end of the nitrogen inlet nozzle and one end of the exhaust nozzle are respectively communicated with the test box; the other ends of the oxygen inlet nozzle and the nitrogen inlet nozzle are respectively connected with an oxygen source and a nitrogen source;
the spraying system comprises a spraying unit, a spraying pipe, a liquid storage tank and a circulating pump; the spraying units are uniformly arranged in the test box along the circumferential direction of the base; one end of the spray pipe is communicated with the spray unit, and the other end of the spray pipe is provided with a circulating pump and is communicated with the liquid storage tank;
the heating assembly comprises at least one heating device arranged in the test chamber;
the ultraviolet light module comprises at least one ultraviolet light emitting diode arranged in the test chamber.
2. The asphalt mixture rutting test device according to claim 1, wherein: the air conditioning assembly further comprises an oxygen concentration sensor and a nitrogen concentration sensor which are arranged in the test box; the oxygen inlet nozzle and the nitrogen inlet nozzle are respectively provided with an inlet valve, and the exhaust nozzle is provided with an exhaust valve; the air inlet valve, the exhaust valve, the oxygen concentration sensor and the nitrogen concentration sensor are respectively electrically connected with the console.
3. The asphalt mixture rutting test device according to claim 1, wherein: the spraying unit comprises a spraying head, a hinged rod and a telescopic rod; a plurality of nozzles are arranged on the spray header; a liquid channel is arranged in the spray header; the spray header is connected with the spray pipe and a plurality of nozzles which are communicated with the liquid channel; one end of the hinge rod is hinged with the spray header, and the other end of the hinge rod is hinged with the inner wall of the test box; the telescopic link is parallel to the hinged rod, one end of the telescopic link is hinged to the inner wall of the test box, and the other end of the telescopic link is hinged to the spray header.
4. The asphalt mixture rutting test device according to claim 3, wherein: the spray head is in an arc surface axle bush shape and comprises an inner arc surface and an outer arc surface, and the inner arc surface is provided with a plurality of nozzles; the outer arc surface is connected with the hinged rod and the telescopic rod.
5. The asphalt mixture rutting test device according to claim 3, wherein: a partition plate is arranged in the liquid storage tank; the inner cavity of the liquid storage tank is divided into a water purification area and a water return area by the partition plate; the circulating pump is arranged in the water purification area; the water purification area is communicated with the water return area through a filter screen; a liquid outlet is formed in the bottom of the test box; the liquid outlet is communicated with the water return area through a liquid outlet pipe; and a drain valve electrically connected with the console is arranged on the drain pipe.
6. The asphalt mixture rutting test device according to claim 5, wherein: the liquid discharge ports are uniformly arranged along the circumferential direction of the base.
7. The asphalt mixture rutting test device according to claim 1, wherein: the heating assembly also comprises a temperature sensor arranged in the test box; the heating device and the temperature sensor are respectively electrically connected with the console.
8. The asphalt mixture rutting test device according to claim 1, wherein: the wheel driving part comprises a sliding component horizontally arranged at the upper end of the rolling wheel; the sliding assembly is connected with the rolling wheel and the test box.
9. The asphalt mixture rutting test device according to claim 8, wherein: the wheel driving part also comprises a pressing part arranged at the upper end of the rolling wheel.
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| CN202022681399.8U CN213842836U (en) | 2020-11-19 | 2020-11-19 | Asphalt mixture rut test device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113358552A (en) * | 2021-08-10 | 2021-09-07 | 中交第四公路工程局有限公司 | Multifunctional test equipment for salinization substance anti-freezing road surface |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113358552A (en) * | 2021-08-10 | 2021-09-07 | 中交第四公路工程局有限公司 | Multifunctional test equipment for salinization substance anti-freezing road surface |
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