CN117232952A - System and method for evaluating service performance and ecological characteristics of red mud-based cementing material - Google Patents
System and method for evaluating service performance and ecological characteristics of red mud-based cementing material Download PDFInfo
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Abstract
The invention discloses a system and a method for evaluating service performance and ecological characteristics of a red mud-based cementing material, comprising the following steps: the closed box body is internally provided with a test groove filled with sand soil for simulating a roadbed; paving a subbase layer, a lower base layer, a middle base layer, an upper base layer and a surface layer on the roadbed in sequence; each layer is paved with red mud-based cementing materials; a plurality of different sensors are respectively arranged in each layer; the controller is connected with each sensor and used for acquiring data acquired by each sensor; the pressure simulation unit, the natural environment simulation unit and the intelligent sampling unit are arranged in the closed box body; the controller judges the position of the data abnormality based on the data detected by each sensor and controls the intelligent sampling unit to sample the position. The invention can simulate the real-time change condition of the service performance and ecological characteristics of the red mud-based cementing material in a real natural environment.
Description
Technical Field
The invention relates to the technical field of red mud-based cementing materials, in particular to a system and a method for evaluating service performance and ecological characteristics of a red mud-based cementing material.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Red mud is an industrial solid waste discharged when alumina is extracted in the aluminum production industry, and is named because of high iron oxide content and similar appearance to red mud. The red mud is alkaline, and harmful components such as heavy metal ions are attached to alkaline solution along with the discharge of a large amount of the red mud to permeate into soil to cause soil salinization, so that the growth of plants is affected; meanwhile, the alkali of the red mud can also permeate into the underground water. Recent researches show that the red mud contains a small amount of radioactive substances, dust generated after the dehydration and weathering of the bare red mud flies upwards, the atmosphere is polluted, and the living environment of human beings, animals and plants can be possibly endangered.
At present, the main means for treating the red mud is stockpiling and is divided into a dry method and a wet method. Both of these approaches present potential, long-term environmental risks. Researchers at home and abroad perform a great deal of experimental study on the aspect of recycling the red mud, and the current study results are mainly focused on the aspects of utilizing the red mud as a building material, removing pollutants as an adsorption material and the like. In addition, the red mud can replace part of clay to be used for preparing cement and concrete, so that not only is a large amount of red mud consumed and the pollution of the red mud to the environment reduced, but also the high pollution, high emission and high energy consumption caused by exploiting limestone and clay in the cement and concrete industry are reduced.
In addition, the red mud is used for replacing cement in traffic foundation engineering, and the red mud is taken as a main body, so that the red mud-based cementing material is prepared through the cooperative utilization of multiple types of solid wastes. Because the red mud itself contains pollutants such as heavy metals and organic matters, the possibility of leakage exists under the continuous influence of natural environment, and once the pollutants flow out in the engineering of applying the red mud-based cementing material, the pollutants cannot be found in time. Meanwhile, the service performance change condition of the red mud-based cementing material after application and the influence condition on surrounding ecology cannot be monitored in real time, analysis and control on the pavement and surrounding environment are affected, and the treatment cannot be carried out at the first time when a problem occurs.
The current research method for the red mud-based cementing material mainly comprises two types: one is to study the internal mechanism through indoor basic experiments; and the other is to study the service performance of the material through practical application. The basic experiment cannot simulate the field situation, lacks monitoring of the material performance under the influence of different factors on the field, and the simple practical application cannot meet the purpose of obtaining scientific research results in a short period.
Disclosure of Invention
In order to solve the problems, the invention provides a system and a method for evaluating the service performance and the ecological characteristics of a red mud-based cementing material, which can realize the characteristics of real-time monitoring, intelligent sampling and simulation of on-site precipitation and temperature change, can timely acquire the leaching characteristics, the operating rules and the change information of the material performance of pollution components (including pollution components such as heavy metals and organic matters) in the road use process of the red mud-based cementing material, and can evaluate the service performance and the ecological characteristics of the red mud-based cementing material for a long time.
In some embodiments, the following technical scheme is adopted:
a system for evaluating service performance and ecological characteristics of a red mud-based cementing material comprises:
the closed box body is internally provided with a test groove filled with sand soil for simulating a roadbed; paving a subbase layer, a lower base layer, a middle base layer, an upper base layer and a surface layer on the roadbed in sequence; each layer is paved with red mud-based cementing materials; the surface of the surface layer is respectively paved with a temperature sensor, a humidity sensor and a pressure sensor at set positions; the pressure sensor, the organic matter sensor and the ion sensor are respectively buried in the set positions of the subbase layer, the lower base layer, the middle base layer and the upper base layer;
the controller is connected with each sensor and is used for acquiring data acquired by each sensor;
the pressure simulation unit, the natural environment simulation unit and the intelligent sampling unit are arranged in the closed box body;
the controller judges the position of the data abnormality based on the data detected by each sensor and controls the intelligent sampling unit to sample the position.
Further, the intelligent sampling unit comprises at least one sampling cylinder, the top end of the sampling cylinder is close to the top of the closed box body, and the bottom end of the sampling cylinder extends to the bottom of the test groove; sampling ports are respectively arranged at positions corresponding to the roadbed, the subbase layer, the lower base layer, the middle base layer, the upper base layer and the surface layer on the sampling cylinder; be equipped with sample piece and track in the sampling tube, the sample piece can be along track operation to every layer of structure's sampling port department, takes a sample through the sampling port.
Further, the sampling piece is a sampling shovel, the shovel handle of the sampling shovel is arranged to be of a piston telescopic structure, and the length of the shovel handle can be adjusted through piston telescopic.
Further, the natural environment simulation unit includes: the device comprises a simulated precipitation module, a temperature control module and a humidity control module;
the simulated precipitation module comprises a plurality of precipitation pipelines which are uniformly arranged at the top of the closed box body, and precipitation holes are formed in the precipitation pipelines;
the outside of the closed box body is provided with a container for holding simulated rainwater, and the container is communicated with a water falling pipeline; simulation of different precipitation levels is achieved by pumping simulated rainwater of different pressures into the precipitation pipeline;
the temperature control module comprises a refrigerating device and a heating device, and controls the refrigerating device or the heating device to work according to the required temperature and controls the closed box body to reach the set temperature;
the humidity control module comprises a humidifier, and controls the humidifier to work according to the required humidity to control the closed box body to achieve the set humidity.
Further, the pressure simulation unit is a vehicle arranged on the surface layer, and weights with different weights can be placed on the vehicle so as to simulate different pressure sizes and distribution.
Further, the temperature sensor, the humidity sensor, the pressure sensor, the organic matter sensor and the ion sensor are uniformly distributed in the corresponding structures.
Further, the pavement is formed by paving sandy soil stabilized by using red mud-based cementing materials;
the subbase layer, the lower base layer, the middle base layer and the upper base layer are all: the red mud-based cementing material is formed by paving stabilized macadam;
the surface layer is made of the following materials: asphalt mixture, cement concrete, water asphalt macadam mixture, or water macadam soil-doped mixture.
Further, the ion sensor includes an anion sensor and a cation sensor; the anion sensor is capable of monitoring SO 4 2- And C l - The cation sensor is capable of monitoring the concentration of lead ions, copper ions, chromium ions, arsenic ions, and cadmium ions.
Further, the method further comprises the following steps:
and the display unit is connected with each sensor and used for displaying the data detected by each sensor.
In other embodiments, the following technical solutions are adopted:
a method for evaluating service performance and ecological characteristics of a red mud-based cementing material comprises the following steps:
simulating pressure change and natural environment change in the closed box body through the pressure simulation unit and the natural environment simulation unit;
the controller receives environmental parameter change data of different positions of each layer structure monitored by each sensor in the closed box in real time;
when detecting that the environmental parameter of a certain position of a certain layer structure is abnormal, the intelligent sampling unit samples the soil at the position;
carrying out component analysis on the sample to obtain pollution condition data of surrounding soil and groundwater after the red mud-based cementing material is used in different periods; if the parameter abnormality of the position is that percolate is generated, cleaning the sampled soil, and detecting and analyzing the cleaned liquid sample;
based on environmental parameter change data and pollution condition data, the long-acting evaluation of the service performance and the surrounding ecology of the red mud-based cementing material is realized.
Compared with the prior art, the invention has the beneficial effects that:
(1) The environment is simulated natural environment, particularly four seasons, and the service performance and the real-time change condition of the ecological characteristics of the red mud-based cementing material in the real natural environment can be simulated by simulating factors such as precipitation, temperature adjustment, humidity adjustment and the like, so that a new idea is provided for the performance monitoring of roads in the future.
(2) The pressure simulation unit overcomes the difficulty that the contact area cannot be determined during loading, and can simulate the acting force of the change of the movement direction and the pressure on the road surface in the low-speed movement state of a normal vehicle. Equidistant pressure sensors are paved in the road, so that the change condition of the response of the vehicle passing through the front road surface and the rear road surface can be accurately measured.
(3) The closed box body is made of toughened glass, the traditional mortise and tenon structure is adopted for assembly, and the assembly and disassembly are simple and convenient, and the safety coefficient is high. The pressure in overweight situations can be borne, and various conditions in the actual running process can be simulated.
(4) The intelligent sampling unit can timely and effectively sample abnormal data positions of the sensor, improves sampling precision, reduces sampling errors and improves accuracy of monitoring data.
(5) The evaluation system for the service performance and the ecological characteristics of the red mud-based cementing material fills the blank that the solid waste material cannot be monitored for a long time when applied to a pavement structure, can timely acquire the leaching characteristics, the working rules and the change information of the material performance of pollution components (including heavy metals, organic matters and other pollution components) in the road use process of the red mud-based cementing material, and can evaluate the service performance and the ecological characteristics of the red mud-based cementing material for a long time. The method is beneficial to timely early warning of road surface problems and maintains the original state of surrounding ecology to the greatest extent.
Additional features and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic diagram of a system for evaluating service performance and ecological characteristics of a red mud-based cementing material in an embodiment of the invention;
FIG. 2 is a schematic diagram of a pressure simulation unit in an embodiment of the invention;
FIG. 3 is a schematic diagram of a local structure of an intelligent sampling unit according to an embodiment of the present invention;
FIG. 4 is a schematic view of a sampling member according to an embodiment of the present invention;
1, simulating a precipitation module; 2 a pressure simulation unit; 3, an intelligent sampling unit; 4 a display unit; 5 a temperature control module; 6, a singlechip; 7, a surface layer; 8, a base layer is arranged on the substrate; 9 a middle base layer; 10 lower base layer; 11 a base layer; 12 base layer, 13 sampling tube, 14 sampling port, 15 track, 16 shovel shaft, 17 piston telescopic structure.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Example 1
In one or more embodiments, a system for evaluating service performance and ecological characteristics of a red mud-based cementing material is disclosed, and in combination with fig. 1, the system specifically includes:
the closed box body is made of toughened glass; the closed box body is internally provided with a test groove filled with sand, and the sand is filled into the test groove and compacted to simulate the roadbed 12.
Paving a subbase layer 11, a lower base layer 10, a middle base layer 9, an upper base layer 8 and a surface layer 7 on the roadbed in sequence; each layer is paved with red mud-based cementing materials; wherein, the roadbed is formed by using red mud-based cementing materials to stabilize sandy soil; the subbase layer 11, the lower base layer 10, the middle base layer 9 and the upper base layer 8 are formed by paving red mud-based cementing material stabilized macadam; the red mud-based cementing material completely replaces cement, plays a role consistent with that of cement in a road, namely, plays roles of bonding and filling, generates cement gel through hydration reaction, and coagulates sand and stone into concrete, and redundant cement fills gaps of sand and stone to play a role of filling. The material of the surface layer 7 is asphalt mixture or cement concrete or asphalt macadam mixture or macadam soil-doped mixture.
In the embodiment, a temperature sensor, a humidity sensor and a pressure sensor are respectively and uniformly paved at each position of the surface layer 7; the device is used for monitoring pavement deformation and temperature and humidity change conditions of the environment.
The pressure sensor, the organic matter sensor and the ion sensor are respectively and uniformly buried at different positions in the subbing layer 11, the lower subbing layer 10, the middle subbing layer 9 and the upper subbing layer 8; the ion sensor is used for monitoring the concentration of surrounding ions of the red mud-based cementing material caused by the change of external environments such as pressure, temperature, humidity and the like, and comprises an anion sensor and a cation sensor. An anion sensor can monitor SO 4 2- And C l - The concentration range of the anions which can be monitored is 0.001-9999 mg/kg; the cation sensor can monitor substances such as lead ions, copper ions, chromium ions, arsenic ions, cadmium ions and the like, and the concentration range of the monitorable cations is 0.001-9999 mg/kg. The organic matter sensor is used for detecting the concentration of organic pollution factors remained in the soil; the organic pollution factors such as petroleum hydrocarbon pollutant, halogenated hydrocarbon pollutant, etc. refer to organic matters remained in soil after natural environment influence and filtering by the red mud-based cementing material, and the concentration range of the organic matters can be monitored
0.001～9999mg/kg。
The sensors are connected with the controller through connecting wires, and data collected by the sensors are transmitted to the controller; the controller can select a singlechip 6; the controller may be provided with one or a plurality of controllers, for example: the single chip microcomputer A is used for reading temperature information of all layers, setting initial values and presenting data in a display, the single chip microcomputer B is used for reading humidity information of all layers, setting initial values and presenting data in the display, and the single chip microcomputer C is used for sampling at each layer and the like.
In the embodiment, a pressure simulation unit 2, a natural environment simulation unit and an intelligent sampling unit 3 are also arranged in the closed box body; wherein the pressure simulation unit 2 comprises a vehicle arranged on the surface layer 7, and weights with different weights can be placed on the vehicle to simulate different pressure magnitudes and distributions.
The natural environment simulation unit includes: the device comprises a simulated precipitation module 1, a temperature control module 5 and a humidity control module;
the simulated precipitation module 1 comprises a plurality of precipitation pipelines which are uniformly arranged at the top of the closed box body, and precipitation holes are formed in the precipitation pipelines; the outside of the closed box body is provided with a container for holding simulated rainwater, and the container is communicated with a water falling pipeline; simulation of different precipitation levels is achieved by pumping simulated rainwater of different pressures into the precipitation pipeline; the temperature control module 5 comprises a refrigerating device and a heating device, and controls the refrigerating device or the heating device to work according to the required temperature and controls the inside of the closed box body to reach the set temperature; the humidity control module comprises a humidifier, and controls the humidifier to work according to the required humidity to control the closed box body to achieve the set humidity.
In this embodiment, referring to fig. 3, the intelligent sampling unit 3 includes at least one sampling tube 13, where the top end of the sampling tube 13 is close to the top of the closed box, and the bottom end extends to the bottom of the test tank; sampling ports 14 are respectively arranged on the sampling cylinder 13 at positions corresponding to the roadbed, the subbase layer 11, the lower base layer 10, the middle base layer 9, the upper base layer 8 and the surface layer 7; the sampling barrel 13 is internally provided with a sampling piece and a track 15, the sampling piece can move to a sampling port of each layer structure along the track 15, and sampling is carried out through the sampling port; in this embodiment, the track may be in the form of a conveyor belt, where the sampling member is fixed on the conveyor belt, and the conveyor belt drives the sampling member to move to the position of the sampling port 14 of the set layer structure; alternatively, the sliding rail and the sliding block can be matched, the sliding block can move on the rail, and the sampling piece is fixed on the sliding block and moves along with the sliding block.
The sampling part adopts a sampling shovel, as shown in fig. 4, a shovel handle 16 of the sampling shovel is provided with a piston telescopic structure 17, and the length of the shovel handle 16 can be adjusted through piston telescopic, so that soil samples at different positions of each layer of structure can be obtained; the thickness of sampling shovel is less than the thickness of thinnest upper base layer 8, can realize the accurate sample to soil sample through sampling shovel. After the sampling is completed, soil can be replenished to the sampling position through a sampling shovel.
When an abnormality in sensor data is detected, such as: if the temperature of a certain position of the middle base layer 9 is abnormal, the sampling piece is controlled to move to a sampling port corresponding to the middle base layer 9 on the sampling cylinder 13 through the track 15, the sampling shovel stretches to the position of the temperature abnormality for sampling, and backfilling is carried out on the corresponding position after the sampling is finished, so that the stability of the whole structure is ensured.
In addition, when the fact that the underground is percolated due to the factors such as rainwater is detected, the sensor can generate signal fluctuation, a small-sized Luoyang shovel is used for reaching the position of the underground where the percolate is generated along the track 15, soil at the corresponding position is obtained, the taken liquid is washed by deionized water, a liquid sample at the corresponding position is obtained, and the liquid sample is detected.
And (3) carrying out component analysis on the sampled sample to obtain pollution condition data of the red mud-based cementing material in different periods on surrounding soil and groundwater after road use.
In this embodiment, the device further comprises a display unit 4 connected with each sensor for displaying and storing the data detected by each sensor; and judging the service performance and ecological characteristic long-term evaluation condition of the red mud-based cementing material in the test model according to the monitored data condition.
The evaluation system for the service performance and the ecological characteristics of the red mud-based cementing material fills the blank that the solid waste material cannot be monitored for a long time when applied to a pavement structure, can timely acquire the leaching characteristics, the working rules and the change information of the material performance of pollution components (including heavy metals, organic matters and other pollution components) in the road use process of the red mud-based cementing material, and can evaluate the service performance and the ecological characteristics of the red mud-based cementing material for a long time. The method is beneficial to timely early warning of road surface problems and maintains the original state of surrounding ecology to the greatest extent.
Example two
In one or more embodiments, a method for evaluating service performance and ecological characteristics of a red mud-based cementing material is disclosed, which specifically comprises the following steps:
simulating natural environments such as precipitation, temperature, humidity and the like and the pressure condition of a road surface, acquiring sampling data of each sensor, and monitoring environmental parameter change data of each layer of structure in real time;
sampling the position (such as temperature abnormality or humidity abnormality) of the abnormal data monitored by the sensor through an intelligent sampling unit;
carrying out component analysis on the sample to obtain pollution condition data of surrounding soil and groundwater after the red mud-based cementing material is used in different periods; if the parameter abnormality of the position is that percolate is generated, cleaning the sampled soil, and detecting and analyzing the cleaned liquid sample;
based on environmental parameter change data and pollution condition data, realizing long-term evaluation on the service performance and the surrounding ecology of the red mud-based cementing material; such as: the values of the ion sensor, the pressure sensor and the organic matter sensor are obtained, the change of the values is observed, the leaching condition of pollution factors of the red mud-based cementing material in the application process can be obtained based on the change, and further the pollution condition to the surrounding environment can be obtained, so that whether the used material is damaged (namely, whether the service performance is good) is judged, and finally, the evaluation of the service performance and the ecological characteristics of the red mud-based cementing material is realized.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (10)
1. A system for evaluating service performance and ecological characteristics of a red mud-based cementing material is characterized by comprising the following components:
the closed box body is internally provided with a test groove filled with sand soil for simulating a roadbed; paving a subbase layer, a lower base layer, a middle base layer, an upper base layer and a surface layer on the roadbed in sequence; each layer is paved with red mud-based cementing materials; the surface of the surface layer is respectively paved with a temperature sensor, a humidity sensor and a pressure sensor at set positions; the pressure sensor, the organic matter sensor and the ion sensor are respectively buried in the set positions of the subbase layer, the lower base layer, the middle base layer and the upper base layer;
the controller is connected with each sensor and is used for acquiring data acquired by each sensor;
the pressure simulation unit, the natural environment simulation unit and the intelligent sampling unit are arranged in the closed box body;
the controller judges the position of the data abnormality based on the data detected by each sensor and controls the intelligent sampling unit to sample the position.
2. The evaluation system for service performance and ecological characteristics of red mud-based binding material according to claim 1, wherein the intelligent sampling unit comprises at least one sampling cylinder, the top end of the sampling cylinder is close to the top of the closed box body, and the bottom end of the sampling cylinder extends to the bottom of the test tank; sampling ports are respectively arranged at positions corresponding to the roadbed, the subbase layer, the lower base layer, the middle base layer, the upper base layer and the surface layer on the sampling cylinder; be equipped with sample piece and track in the sampling tube, the sample piece can be along track operation to every layer of structure's sampling port department, takes a sample through the sampling port.
3. The evaluation system for service performance and ecological characteristics of red mud-based cementing materials according to claim 1, wherein the sampling piece is a sampling shovel, a shovel shaft of the sampling shovel is of a piston telescopic structure, and the length of the shovel shaft can be adjusted through piston telescopic.
4. The system for evaluating service performance and ecological characteristics of red mud-based cementing materials according to claim 1, wherein the natural environment simulation unit comprises: the device comprises a simulated precipitation module, a temperature control module and a humidity control module;
the simulated precipitation module comprises a plurality of precipitation pipelines which are uniformly arranged at the top of the closed box body, and precipitation holes are formed in the precipitation pipelines;
the outside of the closed box body is provided with a container for holding simulated rainwater, and the container is communicated with a water falling pipeline; simulation of different precipitation levels is achieved by pumping simulated rainwater of different pressures into the precipitation pipeline;
the temperature control module comprises a refrigerating device and a heating device, and controls the refrigerating device or the heating device to work according to the required temperature and controls the closed box body to reach the set temperature;
the humidity control module comprises a humidifier, and controls the humidifier to work according to the required humidity to control the closed box body to achieve the set humidity.
5. The evaluation system for service performance and ecological characteristics of red mud-based cementing materials according to claim 1, wherein the pressure simulation unit is a vehicle arranged on the surface layer, and weights with different weights can be placed on the vehicle to simulate different pressure sizes and distribution.
6. The evaluation system for service performance and ecological characteristics of red mud-based cementing materials according to claim 1, wherein the temperature sensor, the humidity sensor, the pressure sensor, the organic matter sensor and the ion sensor are uniformly distributed in the corresponding structures.
7. The evaluation system for service performance and ecological characteristics of the red mud-based cementing material according to claim 1, wherein,
the pavement is formed by paving red mud-based cementing materials to stabilize sandy soil;
the subbase layer, the lower base layer, the middle base layer and the upper base layer are all: the red mud-based cementing material is formed by paving stabilized macadam;
the surface layer is made of the following materials: asphalt mixture, cement concrete, water asphalt macadam mixture, or water macadam soil-doped mixture.
8. The system for evaluating the service performance and the ecological characteristics of the red mud-based binding material according to claim 1, wherein the ion sensor comprises an anion sensor and a cation sensor; the anion sensor is capable of monitoring SO 4 2- And Cl - The cation sensor is capable of monitoring the concentration of lead ions, copper ions, chromium ions, arsenic ions, and cadmium ions.
9. The system for evaluating the service performance and the ecological characteristics of the red mud-based cementing material according to claim 1, further comprising:
and the display unit is connected with each sensor and used for displaying the data detected by each sensor.
10. A method for evaluating service performance and ecological characteristics of a red mud-based cementing material is characterized by comprising the following steps:
simulating pressure change and natural environment change in the closed box body through the pressure simulation unit and the natural environment simulation unit;
the controller receives environmental parameter change data of different positions of each layer structure monitored by each sensor in the closed box in real time;
when detecting that the environmental parameter of a certain position of a certain layer structure is abnormal, the intelligent sampling unit samples the soil at the position;
carrying out component analysis on the sample to obtain pollution condition data of surrounding soil and groundwater after the red mud-based cementing material is used in different periods; if the parameter abnormality of the position is that percolate is generated, cleaning the sampled soil, and detecting and analyzing the cleaned liquid sample;
based on environmental parameter change data and pollution condition data, the long-acting evaluation of the service performance and the surrounding ecology of the red mud-based cementing material is realized.
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