Concrete flowing water corrosion test device and method

Abstract

The invention relates to a concrete dynamic water corrosion test device and method, and belongs to the technical field of building materials. The device is mainly composed of a concrete dynamic water corrosion test box and a liquid storage tank, a box body of the test box and the liquid storage tank are both prepared from an ultra-high-performance cement-based material, and the ultra-high-performance cement-based material comprises the following raw materials in parts by weight: 1 part of a dry blend, 0.10-0.15 part of water, 0.001-0.004 part of a powder polycarboxylate superplasticizer and 0.02-0.06 part of hybrid fibers. The anti-fouling and waterproof effects are achieved, and meanwhile excellent water resistance and aging resistance are achieved; according to the test device, a dynamic water corrosion environment and a programmed system are integrated, actual service conditions can be simulated more truly, a temperature and pH value real-time monitoring system is integrated in the test box body, high automation of the test process and accuracy of data acquisition are achieved, the test efficiency and the result reliability are remarkably improved, and the test device is suitable for popularization and application. A key technical means is provided for deeply researching the durability of the concrete, especially the durability of the cement concrete with high solid waste mixing amount.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of concrete dynamic water dissolution test device and method, belong to building material technical field. BACKGROUND

[0002] With the promotion of "double carbon" strategy, the application of low clinker, high solid waste content cementitious material system is more and more, but also brings new technical challenges. High solid waste low carbon cementitious material may cause calcium dissolution and other problems more prominent, that is, in the water service environment, calcium ion is more likely to dissolve out, resulting in loose concrete structure, early strength development slowly, and seriously deteriorate its durability such as carbonation resistance and impermeability, become the bottleneck of low clinker concrete application.

[0003] Calcium dissolution of concrete is one of the important reasons for the durability degradation in water environment, there is no unique and unified "standard" test method at present, the commonly used method is mainly divided into two categories of natural dissolution test and accelerated dissolution test. The test device used in dissolution test, such as box or liquid storage tank, is usually made of metal or plastic. Because the period of natural dissolution test is long, usually needs ten years or even dozens of years, the test device may cause poor reproducibility and large dispersion of test results due to material immersion, it is difficult to maintain long-term natural dissolution experiment; Accelerated dissolution test can significantly shorten the test period by strengthening corrosion factors, such as increasing the concentration of corrosive ions, reducing pH value or applying electric field, but the test device made of metal is easy to rust or ion precipitation in high concentration salt, alkali and other solutions, and the test device made of plastic is easy to age and become brittle or degrade in a long time, which affects the accuracy of experimental results on the one hand, and may lead to the difficulty of continuous testing on the other hand. SUMMARY

[0004] In order to overcome the defects of the existing concrete dynamic water dissolution test device, the purpose of the present application is to provide a kind of concrete dynamic water dissolution test device and method. The device is mainly composed of concrete dynamic water dissolution test box and liquid storage tank, the material of the box body of test box and the tank body of liquid storage tank is ultra high performance cement, which has excellent water resistance and aging resistance while realizing anti-fouling and waterproof effect, at the same time, the test device integrates dynamic water dissolution environment and programmed system, which can more truly simulate the actual service condition, realizes the high automation of test process and the accuracy of data acquisition by integrating temperature and pH value real-time monitoring system in the test box, significantly improves the test efficiency and the reliability of test results, and provides a key technical means for in-depth study of the durability of concrete, especially the durability of high solid waste content cement concrete.

[0005] In order to achieve the purpose of the present application, the following technical scheme is provided.

[0006] The application discloses a concrete dynamic water erosion test device, which is mainly composed of a test box and a liquid storage tank, and the test box and the liquid storage tank are communicated through a liquid conveying pipeline.

[0007] Further, the raw material composition and content of the super high performance cement-based material are as follows in terms of weight parts: 1 part of dry mixed material, 0.10-0.15 parts of water, 0.001-0.004 parts of powder polycarboxylic acid water reducer and 0.02-0.06 parts of hybrid fiber.

[0008] The hybrid fiber is formed by mixing organic fiber and steel fiber at a mass ratio of 1:0.5-1, and the organic fiber is at least one of glass fiber, polyformaldehyde fiber and polypropylene fiber. Further, the raw material composition and content of the dry mixed material are as follows in terms of weight parts: 1 part of composite cementitious material, 0.6-1 parts of graded fine aggregate, 0.004-0.01 parts of crystalline component, 0.008-0.02 parts of hydrophobic component, 0.005-0.05 parts of latex powder and 0.001-0.003 parts of cellulose ether.

[0009] The raw material composition and content of the composite cementitious material are as follows in terms of weight parts: 1 part of ordinary portland cement, 0.2-0.3 parts of I-grade fly ash, 0.2-0.3 parts of S95 mineral powder and 0.05-0.15 parts of silica fume. The graded fine aggregate has a water content of less than 0.15% and a fineness modulus of 1.2-2.6. The crystalline component is calcium carbonate particles or silicon dioxide particles, and has a nanoscale particle size. The hydrophobic component is at least one of isobutyl triethoxysilane, n-octyl triethoxysilane and dodecyl trimethoxysilane.

[0010] The forming method of the super high performance cement-based material is as follows: The dry mixed material, water and powder polycarboxylic acid water reducer are fully stirred to form a self-leveling slurry, then the hybrid fiber is added and uniformly stirred, and then the slurry is poured into a pouring mold, the self-leveling slurry is poured, the vibration-free pouring is realized, the mold is demoulded after hardening, and the test box and the liquid storage tank can be obtained after curing for more than 28 days or accelerated curing at 60-70 DEG C for 3-5 days.

[0011] Further, more than one wave fan is arranged in the box body of the test box to control the flow rate of the test solution and simulate the dynamic water scouring environment. Further, a temperature sensor and a pH sensor are arranged in the box body of the test box to monitor the solution environment temperature and pH in real time. Further, an automatic control monitoring system is arranged on the test box to control the working state of the wave fan and collect and monitor the temperature and pH data in real time.

[0012] The liquid storage tank is used for storing the test solution. The box body of the test box is communicated with the liquid storage tank through the liquid delivery pipeline; the box body of the test box is provided with a liquid discharge pipeline, and the liquid discharge pipeline is provided with a liquid discharge valve for discharging the test solution in the test box after the test.

[0013] A concrete dynamic water erosion test method, wherein the method is performed by using the concrete dynamic water erosion test device, and the steps are as follows: (1) The concrete test piece cured to the required age is soaked in a saturated treatment solution at 20±2℃ until the mass is constant, so as to ensure that the internal pores of the test piece are in a saturated state and the initial ion concentration on the surface is uniform, and a saturated treatment test piece is obtained. Further, in step (1), the saturated treatment solution can be a saturated Ca(OH)2 solution, and the test piece is soaked until the mass change rate is less than 0.1% for three consecutive times, which is considered as mass constant. Further, in step (1), the distance between each test piece and the distance between the test piece and the box wall are kept at least 50 mm to ensure the uniformity of the dynamic water environment. Further, the required erosion medium is prepared as the test solution and stored in the storage tank; when the erosion test is performed, the test solution is input into the test box from the liquid storage tank through the liquid delivery pipeline. Further, the required test solution is the solution required for the erosion test, such as 1.5 mol / L ammonium chloride solution and 2 mol / L sodium chloride solution. (2) Close the test box cover to make the box body in a sealed state, and then set the test parameters through the automatic control monitoring system according to the test scheme and control, collect and monitor as follows: 1) Turn on the control switch of the wave fan, simulate the dynamic water scouring environment according to the test requirements; 2) Turn on the temperature and pH sensors to start real-time monitoring of the temperature and pH. After the test, the test piece is taken out, the surface residual solution is immediately washed with deionized water, and the surface moisture is absorbed with a soft cloth; then, according to the relevant standards such as GB / T 50082 ordinary concrete long-term performance and durability test method standard, the test piece can be subjected to appearance observation, mass determination, mechanical property test or microstructure analysis test.

[0014] Advantages (1) The present application provides a kind of concrete dynamic water erosion test device, in the device, by using the box of test box made of ultra-high performance cement-based material and liquid storage tank, ensure the compactness and long-term durability of structure, by the design of high-strength, high-density, high-anti-fouling and waterproof component, substantially reduce the risk of box receiving test solution erosion ion degradation, can improve the accuracy of test, ensure that test is carried out continuously for a long time;Solve the technical problems that the box body or liquid storage tank of traditional metal or plastic test box is eroded or ion-degraded under long-term immersion in salt, alkali and other solutions, or the box body is corroded and thinned, which affects the ion concentration and accuracy in solution extraction over time; (2) The present application provides a kind of concrete dynamic water erosion test device, test box and liquid storage tank are made of ultra-high performance cement-based material, by selecting appropriate raw material component and dosage, so that the initial mortar flow degree of self-leveling cement-based slurry during preparation is ≥350 mm, the mortar flow degree is ≥300 mm in half an hour, the box and liquid storage tank prepared are dense and do not leak water;28 days curing can reach compressive strength of 80 MPa or more, water contact angle ≥135 °, 28 days of 0.5 hour water absorption rate <1%;Permeation pressure ratio ≥300%;Water absorption ratio ≤60%, with good anti-fouling, water resistance; (3) The present application provides a kind of concrete dynamic water erosion test device, the test box of the test device is integrated with wave fan, realizes the integration of dynamic water erosion environment and automatic control monitoring system, can simulate the multi-factor coupling erosion effect under actual service condition;By using different test solutions as erosion medium, it has the erosion test ability under natural environment and accelerated environment;Compared with the existing natural erosion or accelerated erosion test, through the synergistic simulation of dynamic water environment and programmed multi-factor coupling, the test cycle is significantly shortened, and the efficiency is higher; (4) The present application provides a kind of concrete dynamic water erosion test device, relying on automatic control monitoring system integrates temperature sensor and pH sensor, real-time, continuous monitoring and recording of key parameters, compared with traditional test method, has obvious advantages in automation degree and accuracy of data acquisition; (5) The present invention provides a concrete dynamic water corrosion test device. The test chamber in the test device has good versatility and high throughput test capability. It can be compatible with specimens of different specifications and sizes and can be processed in batches. Compared with the existing test methods, it significantly improves the test efficiency per unit time, reduces the average operating intensity of a single specimen, and simplifies the overall process. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the test chamber and automatic control and monitoring system in a concrete dynamic water corrosion test device according to the embodiment; Figure 2 This is a schematic diagram of the internal structure of the test chamber in a concrete dynamic water corrosion test device according to the embodiment; Figure 3 This is a schematic diagram of the connection structure between the test chamber and the storage tank in a concrete dynamic water corrosion test device according to the embodiment; Among them, 1—test chamber, 2—automatic control and monitoring system, 3—wave generator fan, 4—temperature sensor, 5—pH sensor, 6—sample, 7—drainage pipeline, 8—drainage valve, 9—infusion pipeline, 10—storage tank. Detailed Implementation

[0016] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the present invention.

[0017] In the following embodiments: The initial mortar flowability and half-hour mortar flowability of the grout were measured in accordance with the requirements of JCTT 986-2018 Cement-based Grouting Materials; The compressive strength, water contact angle, water absorption rate at 0.5 hours after 28 days of standard curing, impermeability pressure ratio, and water absorption ratio of ultra-high performance cement-based materials were measured in accordance with the requirements of JC 474-2008 Mortar and Concrete Waterproofing Agent.

[0018] Example 1 like Figure 1 As shown in Figure 3, a concrete dynamic water corrosion test device is provided. The device mainly consists of a test chamber 1 and a liquid storage tank 10. The test chamber 1 and the liquid storage tank 10 are connected by a liquid delivery pipeline 9. The test chamber 1 and the liquid storage tank 10 are both made of ultra-high performance cement-based materials. The wall thickness of the test chamber 1 is 10 mm, and the wall thickness of the liquid storage tank 10 is 10 mm.

[0019] The raw material composition and content of the ultra-high performance cement-based material are as follows, by weight: 1 part dry mix, 0.10 parts water, 0.004 parts powdered polycarboxylate superplasticizer, and 0.06 parts mixed fibers; Hybrid fibers are made by mixing glass fibers and steel fibers in a mass ratio of 1:1. Furthermore, the raw material composition and content of the dry mix, by weight, are as follows: The composition includes 1 part composite cementitious material, 1 part graded fine aggregate, 0.01 part crystalline component, 0.02 part hydrophobic component, 0.05 part latex powder, and 0.001 part cellulose ether. The raw material composition and content of the composite cementitious material, by weight, are as follows: 1 part ordinary Portland cement, 0.3 parts Grade I fly ash, 0.3 parts S95 mineral powder, and 0.15 parts silica fume; Graded fine aggregate: moisture content 0.13%, fineness modulus 2.6; The crystalline component consists of calcium carbonate particles with a particle size in the nanometer scale. The hydrophobic component is isobutyltriethoxysilane.

[0020] The molding method of the ultra-high performance cement-based material is as follows: The dry mixture, water, and powdered polycarboxylate superplasticizer are thoroughly mixed to form a self-leveling slurry. Then, mixed fibers are added and stirred evenly. The initial mortar flowability of the slurry is 350 mm, and the mortar flowability is 320 mm after half an hour. The slurry is then poured into a casting mold, and the slurry self-levels to achieve vibration-free molding. After hardening, the slurry is demolded and cured for 28 days to obtain the test chamber 1 and the liquid storage tank 10. The prepared chamber and liquid storage tank 10 are both dense and leak-proof.

[0021] The ultra-high performance cement-based material prepared in this embodiment reaches a compressive strength of 108 MPa, a water contact angle of 135°, and a water absorption rate of 0.7% at 0.5 hours after 28 days of curing; its impermeability pressure ratio is 350%; its water absorption ratio is 52%; and it has good anti-fouling and water resistance properties.

[0022] Six wave-generating fans 3 are installed inside the test chamber 1 to control the flow rate of the test solution and simulate the scouring environment of flowing water. Temperature sensor 4 and pH sensor 5 are also installed inside the test chamber 1 to monitor the temperature and pH of the solution environment in real time. The test chamber 1 is equipped with an automatic control and monitoring system 2, which is used to control the working status of the wave generator fan 3 and to collect and monitor temperature and pH data in real time during the test.

[0023] Storage tank 10 is used to store test solutions; The test chamber 1 is connected to the storage tank 10 via a liquid delivery pipeline 9; the test chamber 1 is equipped with a drain pipeline 7 and a drain valve 8, which is used to drain the test solution in the test chamber 1 after the test is completed.

[0024] A method for testing concrete dynamic water corrosion, wherein the method is performed using a concrete dynamic water corrosion testing device as described in this embodiment, and the steps are as follows: (1) The concrete specimen 6 cured to the required age is immersed in a saturated treatment solution at 20°C until the mass is constant, so as to ensure that the internal pores of the specimen 6 are saturated and the initial ion concentration on the surface is consistent, thus obtaining the saturated specimen 6. The saturated treatment solution is a saturated Ca(OH)2 solution. The specimen 6 is considered to have a constant mass when the mass change rate is less than 0.1% for three consecutive measurements. Ensure that there is a minimum distance of 50 mm between each specimen 6 and between specimen 6 and the tank wall to ensure the uniformity of the dynamic water environment and the consistency of heat conduction. The required dissolving medium is prepared as a test solution and stored in a storage tank; when conducting accelerated dissolving tests, the test solution is introduced from the storage tank 10 into the test chamber 1 through the infusion pipeline 9; The required test solution is the same as that required for accelerated corrosion testing, which is a 1.5 mol / L ammonium chloride solution; (2) Close the lid of test chamber 1 to make the chamber airtight. Then, according to the test plan, set the test parameters through the automatic control and monitoring system 2 and perform control, data acquisition and monitoring as follows: 1) Activate the control switch of wave generator 3 to simulate a dynamic water scouring environment; 2) Turn on temperature sensor 4 and pH sensor 5 to monitor temperature and pH in real time; After the test, the specimen 6 was removed and immediately rinsed with deionized water to remove any residual solution. The surface moisture was then dried with a soft cloth. Subsequently, specimen 6 was subjected to tests such as appearance observation, mass determination, mechanical property testing, or microstructure analysis in accordance with relevant standards such as GB / T 50082 Standard for Test Methods of Long-Term Performance and Durability of Ordinary Concrete.

[0025] Example 2 like Figure 1 As shown in Figure 3, a concrete dynamic water corrosion test device is provided. The device mainly consists of a test chamber 1 and a liquid storage tank 10. The test chamber 1 and the liquid storage tank 10 are connected by a liquid delivery pipeline 9. The test chamber 1 and the liquid storage tank 10 are both made of ultra-high performance cement-based materials. The wall thickness of the test chamber 1 is 15 mm, and the wall thickness of the liquid storage tank 10 is 15 mm.

[0026] The raw material composition and content of the ultra-high performance cement-based material are as follows, by weight: 1 part dry mix, 0.15 parts water, 0.001 parts powdered polycarboxylate superplasticizer, and 0.02 parts mixed fibers; The hybrid fiber is made by mixing polyoxymethylene fiber and steel fiber in a mass ratio of 1:0.7; Furthermore, the raw material composition and content of the dry mix, by weight, are as follows: The composition consists of 1 part composite cementitious material, 0.6 parts graded fine aggregate, 0.004 parts crystalline component, 0.008 parts hydrophobic component, 0.005 parts latex powder, and 0.003 parts cellulose ether. The raw material composition and content of the composite cementitious material, by weight, are as follows: 1 part ordinary Portland cement, 0.2 parts Grade I fly ash, 0.2 parts S95 mineral powder, and 0.15 parts silica fume; Graded fine aggregate: moisture content 0.11%, fineness modulus 2.2; The crystalline component consists of silica particles with a particle size in the nanometer range. The hydrophobic component is n-octyltriethoxysilane.

[0027] The molding method of the ultra-high performance cement-based material is as follows: The dry mixture, water, and powdered polycarboxylate superplasticizer are thoroughly mixed to form a self-leveling slurry. Then, mixed fibers are added and stirred evenly. The initial mortar flowability of the slurry is 370 mm, and the mortar flowability after half an hour is 335 mm. The slurry is then poured into a casting mold, and the slurry self-levels to achieve vibration-free molding. After hardening, the slurry is demolded and cured for 28 days to obtain the test chamber 1 and the liquid storage tank 10. The prepared test chamber and liquid storage tank 10 are both dense and leak-proof.

[0028] The ultra-high performance cement-based material prepared in this embodiment reaches a compressive strength of 88 MPa, a water contact angle of 142°, and a water absorption rate of 0.8% at 0.5 hours after 28 days of curing. Its impermeability pressure ratio is 365%, and its water absorption ratio is 50%. It has good anti-fouling and water-resistant properties.

[0029] Six wave-generating fans 3 are installed inside the test chamber 1 to control the flow rate of the test solution and simulate the scouring environment of flowing water. Temperature sensor 4 and pH sensor 5 are also installed inside the test chamber 1 to monitor the temperature and pH of the solution environment in real time. The test chamber 1 is equipped with an automatic control and monitoring system 2, which is used to control the working status of the wave generator fan 3 and to collect and monitor temperature and pH data in real time during the test.

[0030] Storage tank 10 is used to store test solutions; The test chamber 1 is connected to the storage tank 10 via a liquid delivery pipeline 9; the test chamber 1 is equipped with a drain pipeline 7 and a drain valve 8, which is used to drain the test solution in the test chamber 1 after the test is completed.

[0031] A method for testing concrete dynamic water corrosion, wherein the method is performed using a concrete dynamic water corrosion testing device as described in this embodiment, and the steps are as follows: (1) The concrete specimen 6 cured to the required age is immersed in a saturated treatment solution at 20°C until the mass is constant, so as to ensure that the internal pores of the specimen 6 are saturated and the initial ion concentration on the surface is consistent, thus obtaining the saturated specimen 6. The saturated treatment solution is a saturated Ca(OH)2 solution. The specimen 6 is considered to have a constant mass when the mass change rate is less than 0.1% for three consecutive measurements. Ensure that there is a minimum distance of 50 mm between each specimen 6 and between specimen 6 and the tank wall to ensure the uniformity of the dynamic water environment and the consistency of heat conduction. The required dissolving medium is prepared as a test solution and stored in a storage tank; when conducting accelerated dissolving tests, the test solution is introduced from the storage tank 10 into the test chamber 1 through the infusion pipeline 9; The required test solution is the solution required for the accelerated corrosion test, which is a 2 mol / L sodium chloride solution; (2) Close the lid of test chamber 1 to make the chamber airtight. Then, according to the test plan, set the test parameters through the automatic control and monitoring system 2 and perform control, data acquisition and monitoring as follows: 1) Activate the control switch of wave generator 3 to simulate a dynamic water scouring environment; 2) Turn on temperature sensor 4 and pH sensor 5 to monitor temperature and pH in real time; After the test, the specimen 6 was removed and immediately rinsed with deionized water to remove any residual solution. The surface moisture was then dried with a soft cloth. Subsequently, specimen 6 was subjected to tests such as appearance observation, mass determination, mechanical property testing, or microstructure analysis in accordance with relevant standards such as GB / T 50082 Standard for Test Methods of Long-Term Performance and Durability of Ordinary Concrete.

[0032] Example 3 like Figure 1 As shown in Figure 3, a concrete dynamic water corrosion test device is provided. The device mainly consists of a test chamber 1 and a liquid storage tank 10. The test chamber 1 and the liquid storage tank 10 are connected by a liquid delivery pipeline 9. The test chamber 1 and the liquid storage tank 10 are both made of ultra-high performance cement-based materials. The wall thickness of the test chamber 1 is 13 mm, and the wall thickness of the liquid storage tank 10 is 13 mm.

[0033] The raw material composition and content of the ultra-high performance cement-based material are as follows, by weight: 1 part dry mix, 0.12 parts water, 0.002 parts powdered polycarboxylate superplasticizer, and 0.02 parts mixed fibers; The hybrid fiber is made by mixing polypropylene fiber and steel fiber in a mass ratio of 1:0.5; Furthermore, the raw material composition and content of the dry mix, by weight, are as follows: The composition includes 1 part composite cementitious material, 1 part graded fine aggregate, 0.006 parts crystalline component, 0.01 parts hydrophobic component, 0.01 parts latex powder, and 0.002 parts cellulose ether. The raw material composition and content of the composite cementitious material, by weight, are as follows: 1 part ordinary Portland cement, 0.3 parts Grade I fly ash, 0.2 parts S95 mineral powder, and 0.05 parts silica fume; Graded fine aggregate: moisture content 0.13%, fineness modulus 1.2; The crystalline component consists of silica particles with a particle size in the nanometer range. The hydrophobic component is dodecyltrimethoxysilane.

[0034] The molding method of the ultra-high performance cement-based material is as follows: The dry mixture, water, and powdered polycarboxylate superplasticizer are thoroughly mixed to form a self-leveling slurry. Then, mixed fibers are added and stirred evenly. The initial mortar flowability of the slurry is 365 mm, and the mortar flowability after half an hour is 330 mm. The slurry is then poured into a casting mold, and the slurry self-levels to achieve vibration-free molding. After hardening, the slurry is demolded and cured for 28 days to obtain the test chamber 1 and the liquid storage tank 10. The prepared test chamber and liquid storage tank 10 are both dense and leak-proof.

[0035] The ultra-high performance cement-based material prepared in this embodiment reaches a compressive strength of 94 MPa after 28 days of standard curing, with a water contact angle of 139°, a water absorption rate of 0.7% at 0.5 hours after 28 days, a permeability pressure ratio of 355%, and a water absorption ratio of 54%. It also exhibits good anti-fouling and water-resistant properties.

[0036] Six wave-generating fans 3 are installed inside the test chamber 1 to control the flow rate of the test solution and simulate the scouring environment of flowing water. Temperature sensor 4 and pH sensor 5 are also installed inside the test chamber 1 to monitor the temperature and pH of the solution environment in real time. The test chamber 1 is equipped with an automatic control and monitoring system 2, which is used to control the working status of the wave generator fan 3 and to collect and monitor temperature and pH data in real time during the test.

[0037] Storage tank 10 is used to store test solutions; The test chamber 1 is connected to the storage tank 10 via a liquid delivery pipeline 9; the test chamber 1 is equipped with a drain pipeline 7 and a drain valve 8, which is used to drain the test solution in the test chamber 1 after the test is completed.

[0038] A method for testing concrete dynamic water corrosion, wherein the method is performed using a concrete dynamic water corrosion testing device as described in this embodiment, and the steps are as follows: (1) The concrete specimen 6 cured to the required age is immersed in a saturated treatment solution at 20°C until the mass is constant, so as to ensure that the internal pores of the specimen 6 are saturated and the initial ion concentration on the surface is consistent, thus obtaining the saturated specimen 6. The saturated treatment solution is a saturated Ca(OH)2 solution. The specimen 6 is considered to have a constant mass when the mass change rate is less than 0.1% for three consecutive measurements. Ensure that there is a minimum distance of 50 mm between each specimen 6 and between specimen 6 and the tank wall to ensure the uniformity of the dynamic water environment and the consistency of heat conduction. The required dissolving medium is prepared as a test solution and stored in a storage tank; when conducting accelerated dissolving tests, the test solution is introduced from the storage tank 10 into the test chamber 1 through the infusion pipeline 9; The required test solution is the solution required for the accelerated corrosion test, which is a 2 mol / L sodium chloride solution; (2) Close the lid of test chamber 1 to make the chamber airtight. Then, according to the test plan, set the test parameters through the automatic control and monitoring system 2 and perform control, data acquisition and monitoring as follows: 1) Activate the control switch of wave generator 3 to simulate a dynamic water scouring environment; 2) Turn on temperature sensor 4 and pH sensor 5 to monitor temperature and pH in real time; After the test, the specimen 6 was removed and immediately rinsed with deionized water to remove any residual solution. The surface moisture was then dried with a soft cloth. Subsequently, specimen 6 was subjected to tests such as appearance observation, mass determination, mechanical property testing, or microstructure analysis in accordance with relevant standards such as GB / T 50082 Standard for Test Methods of Long-Term Performance and Durability of Ordinary Concrete.

Claims

1. A concrete dynamic water corrosion test device, characterized in that: The device mainly consists of a test chamber and a storage tank. The test chamber and the storage tank are connected by a liquid delivery pipeline. The test chamber is equipped with a drain pipeline and a drain valve. Both the chamber and the storage tank of the test chamber are made of ultra-high performance cement-based material; the raw material composition and content of the ultra-high performance cement-based material are as follows, by weight: 1 part dry mix, 0.10 to 0.15 parts water, 0.001 to 0.004 parts powdered polycarboxylate superplasticizer, and 0.02 to 0.06 parts mixed fibers.

2. The concrete dynamic water corrosion test device according to claim 1, characterized in that: The hybrid fiber is made by mixing organic fiber and steel fiber in a mass ratio of 1:0.5 to 1. The organic fiber is at least one of glass fiber, polyoxymethylene fiber and polypropylene fiber. The raw material composition and content of the dry mix, by weight, are as follows: The composition consists of 1 part composite cementitious material, 0.6 to 1 part graded fine aggregate, 0.004 to 0.01 parts crystalline component, 0.008 to 0.02 parts hydrophobic component, 0.005 to 0.05 parts latex powder, and 0.001 to 0.003 parts cellulose ether.

3. The concrete dynamic water corrosion test device according to claim 2, characterized in that: The raw material composition and content of the composite cementitious material, by weight, are as follows: 1 part silicate cement, 0.2 to 0.3 parts Grade I fly ash, 0.2 to 0.3 parts S95 mineral powder, and 0.05 to 0.15 parts silica fume; Graded fine aggregate: moisture content below 0.15%, fineness modulus of 1.2 ~ 2.6; The crystalline components are calcium carbonate particles or silica particles with a particle size in the nanoscale. The hydrophobic component is at least one of isobutyltriethoxysilane, n-octyltriethoxysilane, and dodecyltrimethoxysilane.

4. A concrete dynamic water corrosion test apparatus according to any one of claims 1 to 3, characterized in that: The molding method for ultra-high performance cement-based materials is as follows: The dry mixture, water, and powdered polycarboxylate superplasticizer are thoroughly mixed to form a self-leveling slurry. Then, mixed fibers are added and stirred evenly. The mixture is then poured into a casting mold. Through the self-leveling of the slurry, vibration-free molding is achieved. After hardening, the mixture is demolded and cured for more than 28 days or accelerated curing at 60℃~70℃ for 3~5 days to obtain the test chamber body and liquid storage tank.

5. A concrete dynamic water corrosion test apparatus according to any one of claims 1 to 3, characterized in that: The wall thickness of the test chamber is 10 mm to 15 mm, and the wall thickness of the liquid storage tank is 10 mm to 15 mm.

6. A concrete dynamic water corrosion test apparatus according to any one of claims 1 to 3, characterized in that: The test chamber is equipped with one or more wave generators, temperature sensors, and pH sensors; an automatic control and monitoring system is installed on the test chamber.

7. A method for testing the dynamic water corrosion of concrete, characterized in that: The method is carried out using a concrete dynamic water corrosion test device as described in any one of claims 1 to 6, and the steps are as follows: (1) The concrete specimens cured to the required age are immersed in a saturated treatment solution at 20±2℃ until the mass is constant, so as to ensure that the internal pores of the specimens are saturated and the initial ion concentration on the surface is consistent, and the specimens after saturation treatment are obtained. The etchant medium required for the etch test is prepared as a test solution and stored in a storage tank. When conducting the etch test, the test solution is introduced from the storage tank into the test chamber through the infusion pipeline. (2) Close the test chamber lid to ensure the test chamber is sealed. Then, according to the test plan, set the test parameters through the automatic control and monitoring system and perform control, data acquisition and monitoring as follows: 1) Turn on the control switch of the wave generator to simulate the scouring environment of flowing water according to the test requirements; 2) Turn on the temperature and pH sensors to start real-time monitoring of temperature and pH; After the test, the specimens were removed and the residual solution on the surface was gently rinsed with deionized water, the surface moisture was dried, and the performance of the specimens was tested.

8. A method for testing the dynamic water corrosion of concrete according to claim 7, characterized in that: In step (1), the saturated treatment solution is a saturated Ca(OH)2 solution. The specimen is soaked until the mass change rate is less than 0.1% for three consecutive measurements, which is considered as constant mass. A distance of at least 50 mm is maintained between each specimen and between the specimen and the box wall.

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