CN113533183A - Corrosion detection device and detection method for inorganic cementing material in flowing karst water - Google Patents
Corrosion detection device and detection method for inorganic cementing material in flowing karst water Download PDFInfo
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- CN113533183A CN113533183A CN202110802326.6A CN202110802326A CN113533183A CN 113533183 A CN113533183 A CN 113533183A CN 202110802326 A CN202110802326 A CN 202110802326A CN 113533183 A CN113533183 A CN 113533183A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 180
- 239000000463 material Substances 0.000 title claims abstract description 125
- 238000005260 corrosion Methods 0.000 title claims abstract description 78
- 230000007797 corrosion Effects 0.000 title claims abstract description 78
- 238000001514 detection method Methods 0.000 title claims abstract description 27
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims abstract description 78
- 239000000243 solution Substances 0.000 claims abstract description 44
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims abstract description 39
- 235000017557 sodium bicarbonate Nutrition 0.000 claims abstract description 39
- 238000002347 injection Methods 0.000 claims abstract description 25
- 239000007924 injection Substances 0.000 claims abstract description 25
- 239000004568 cement Substances 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 15
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 239000000523 sample Substances 0.000 claims abstract description 5
- JYYOBHFYCIDXHH-UHFFFAOYSA-N carbonic acid;hydrate Chemical compound O.OC(O)=O JYYOBHFYCIDXHH-UHFFFAOYSA-N 0.000 claims description 11
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 claims description 9
- 238000005086 pumping Methods 0.000 claims description 8
- 230000002265 prevention Effects 0.000 claims description 3
- 238000012854 evaluation process Methods 0.000 claims description 2
- 239000004567 concrete Substances 0.000 abstract description 11
- 238000002156 mixing Methods 0.000 description 7
- 238000003763 carbonization Methods 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 5
- 239000003513 alkali Substances 0.000 description 4
- 239000011575 calcium Substances 0.000 description 4
- 239000011083 cement mortar Substances 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 239000011440 grout Substances 0.000 description 3
- 235000019353 potassium silicate Nutrition 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000009991 scouring Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001226 reprecipitation Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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Abstract
The invention provides a device and a method for detecting corrosion of an inorganic cementing material in flowing karst water, wherein the detection device comprises: the first box body is provided with a liquid feeding port and a liquid discharging port; the bottom of the second box body is provided with a water outlet; one end of the water injection pipe extends into the second box body, the other end of the water injection pipe extends into the first box body, and the other end of the water injection pipe is communicated with a water pump positioned in the first box body; a probe of the pH meter extends into the first box body; the corrosion detection device for the inorganic cementing material in the flowing karst water uses the flowing karst water or the flowing sodium bicarbonate solution under normal pressure to corrode the inorganic cementing material, is consistent with the service environment of a karst cave in a karst region or a cement concrete pile foundation in an underground river, and can accurately simulate the corrosion condition of the karst water on the inorganic cementing material.
Description
Technical Field
The invention relates to the technical field of civil engineering materials, in particular to a device and a method for detecting corrosion of an inorganic cementing material in flowing karst water.
Background
Karst is a special geological structure formed by water chemically attacking, mechanically attacking and collapsing soluble carbonate rocks with migration and re-precipitation of materials. The karst area of China is calculated according to the distribution area of the stratum containing soluble rocks, and can reach 344.4 ten thousand square kilometers, which occupies more than one third of the area of the soil, wherein the karst distribution in areas such as Guangxi, Yunnan and Guizhou is wide, and the karst cave is the most. In the construction process, water inrush and mud gushing of karst tunnels occur at times of serious safety accidents such as foundation sliding and collapse. In the operation process, the problems of erosion and scouring of the base layer, uneven softening and settlement of the roadbed, erosion and water seepage of surrounding rocks of the tunnel and the like are prominent. How to treat the karst foundation, prevent and treat karst tunnel geological disasters, reduce basic unit's erosion and scouring, the inhomogeneous settlement of road bed is the important subject that awaits solution at present.
The pH value of the karst water is 6.8-8.4, and the karst water mainly contains HCO3 -(average 243mg/L), Ca2+(average 77mg/L), SO4 2-(average 14mg/L) plasma. The influence of karst water on the structure and performance of cement concrete and alkali-activated material is mainly from pH and HCO3 -。
Researchers at home and abroad set up standard specifications of cement concrete carbonization and provide a cement concrete carbonization detection device and method. The traditional cement concrete carbonization problem mainly is CO in air2The calcium carbonate is formed on the surface of the concrete by the reaction with water and calcium in hydration products, the pH value in the system is continuously reduced along with the carbonization, and the carbonization products are continuously increased. The corrosion of flowing karst water, the pH value of the karst water is kept unchanged, mainly H+And HCO3 -The device has a coupling corrosion effect on hydration products, so that the traditional cement concrete carbonization detection device cannot evaluate the chemical corrosion problem of the cement concrete and alkali-activated concrete structures in the karst environment.
Therefore, an apparatus and a method for detecting corrosion in flowing karst water by using inorganic gelled materials such as cement concrete and alkali-activated materials are required.
Disclosure of Invention
In view of the above, the invention provides a device and a method for detecting corrosion of an inorganic cementing material in flowing karst water, so as to solve or partially solve the technical problems in the prior art.
In a first aspect, the present invention provides an apparatus for detecting corrosion of an inorganic cementitious material in flowing karst water, comprising:
the first box body is provided with a liquid feeding port and a liquid discharging port;
the bottom of the second box body is provided with a water outlet;
one end of the water injection pipe extends into the second box body, the other end of the water injection pipe extends into the first box body, and the other end of the water injection pipe is communicated with a water pump positioned in the first box body;
and a probe of the pH meter extends into the first box body.
Preferably, the inorganic cementing material corrodes the detection device in the flowing karst water, and the side of the second box body is also provided with a plurality of water overflow preventing holes.
Preferably, the inorganic cementing material corrodes detection device in flowing karst water, the internal volume of first box is 2 ~ 4 times of the internal volume of second box.
In a second aspect, the invention further provides a method for detecting corrosion of an inorganic cementing material in flowing karst water, and the method for evaluating corrosion of the inorganic cementing material in the flowing karst water by using the corrosion detection device comprises the following steps:
preparing karst water or sodium bicarbonate solution with the mass concentration of 1-5%;
preparing an inorganic cementing material and placing the inorganic cementing material in a second box body;
adding karst water or sodium bicarbonate solution into the first box body through the liquid adding port, starting the water pump, pumping the karst water or the sodium bicarbonate solution in the first box body into the second box body through the water injection pipe, enabling the karst water or the sodium bicarbonate solution to flow through the inorganic cementing material to corrode the inorganic cementing material, and opening the water outlet to enable water to flow out of the water outlet after flowing through the inorganic cementing material;
and after the corrosion is finished, detecting the corrosion depth, the breaking strength loss rate and the compressive strength loss rate of the inorganic cementing material.
Preferably, in the method for detecting corrosion of the inorganic cementing material in the flowing karst water, a pH meter is used for detecting the pH value in the first box body in the evaluation process, if the pH value is not between 6.8 and 8.4, the liquid in the first box body is discharged through the discharge port, and the karst water or the sodium bicarbonate solution is added into the first box body again.
Preferably, the inorganic cementing material is used in a method for detecting the corrosion of flowing karst water, wherein the karst water contains Ca2+The mass concentration is 75-80 mg/L, HCO3 -The mass concentration is 205-215 mg/L, SO4 2-The mass concentration is 5-10 mg/L, Cl-The mass concentration is 4-5 mg/L.
Preferably, the method for detecting corrosion of the inorganic cementing material in flowing karst water comprises the step of enabling water to flow through the inorganic cementing material to corrode the inorganic cementing material, wherein the number of corrosion days is 60-360 d.
Compared with the prior art, the device and the method for detecting the corrosion of the inorganic cementing material in the flowing karst water have the following beneficial effects:
(1) the corrosion detection device of the inorganic cementing material in the flowing karst water comprises a first box body and a second box body, wherein a water pump is arranged in the first box body, one end of a water injection pipe extends into the first box body and is communicated with the water pump, and the other end of the water injection pipe extends into the second box body; the detection device disclosed by the invention uses flowing karst water or flowing sodium bicarbonate solution under normal pressure to corrode the inorganic cementing material, is consistent with the service environment of a karst cave in a karst region or a cement concrete pile foundation in an underground river, and can accurately simulate the corrosion condition of the karst water on the inorganic cementing material;
(2) the corrosion detection device is suitable for corrosion of natural flowing karst water and accelerated corrosion, and corrosion samples relate to all inorganic gelled materials.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic structural diagram of a corrosion detection device of an inorganic cementing material in flowing karst water.
Detailed Description
In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The embodiment of the application provides a device for detecting corrosion of an inorganic cementing material in flowing karst water, as shown in fig. 1, comprising:
the first box body 1 is provided with a liquid adding port 11 and a liquid discharging port 12;
a water outlet 21 is arranged at the bottom of the second box body 2;
one end of the water injection pipe 3 extends into the second box body 2, the other end of the water injection pipe 3 extends into the first box body 1, and the other end of the water injection pipe 3 is communicated with a water pump 4 positioned in the first box body 1;
and a pH meter 5, wherein a probe of the pH meter extends into the first box body 1.
In the embodiment of the present application, the second box 2 is located above the first box 1, the first box 1 is provided with a charging opening 11 and a discharging opening 12, karst water or a sodium bicarbonate solution is added into the first box 1 through the charging opening 11, and liquid in the first box 1 is discharged through the discharging opening 12; one end of the water injection pipe 3 extends into the second box body 2, the other end of the water injection pipe extends into the first box body 1, a water pump 4 is arranged in the first box body 1, the other end of the water injection pipe 3 is communicated with the water pump 4, and when the water pump is started, karst water or sodium bicarbonate solution in the first box body 1 can be pumped into the second box body 2 by the water injection pipe 3; the detection device also comprises a pH meter 5, a probe of the pH meter 5 extends into the first box body 1, and the pH value of karst water or sodium bicarbonate solution in the first box body can be detected through the pH meter 5. The working principle of the device for detecting the corrosion of the inorganic cementing material in the flowing karst water in the embodiment of the application is as follows: placing an inorganic gelled material 6 in a second box body 2, adding karst water or a sodium bicarbonate solution into a first box body 1, starting a water pump 4, pumping the karst water or the sodium bicarbonate solution in the first box body 1 into the second box body 2, and simultaneously opening a water outlet 21, so that the karst water or the sodium bicarbonate solution flows through the inorganic gelled material 6 and is discharged through the water outlet 21, thereby corroding the inorganic gelled material 6. It is to be noted that, in the corrosion evaluation, the flow rate of the karst water or the sodium hydrogen carbonate solution into the second tank 2 is controlled by the water pump 4, and the flow rate of the karst water or the sodium hydrogen carbonate solution into the second tank 2 is larger than the flow rate of the karst water or the sodium hydrogen carbonate solution discharged through the water discharge port 21.
In some embodiments, the second tank 2 is further provided at a side thereof with a plurality of water flood prevention holes 22. In the embodiment of the present application, the water overflow preventing holes 22 are formed in the side surface of the second tank 2, and during the corrosion evaluation, the excess karst water or sodium bicarbonate solution in the second tank 2 can be discharged through the water overflow preventing holes 22, specifically, during the corrosion evaluation, the height of the inorganic cementing material 6 is lower than that of the water overflow preventing holes 22, that is, the inorganic cementing material 6 is located below the water overflow preventing holes 22.
In some embodiments, the diameter of the water flood prevention holes 22 is 2-6 cm.
In some embodiments, the internal volume of the first casing 1 is 2 to 4 times of the internal volume of the second casing 2, and preferably, the internal volume of the first casing 1 is 2 times of the internal volume of the second casing 2.
Based on the same invention concept, the embodiment of the application also provides a method for detecting the corrosion of the inorganic cementing material in the flowing karst water, the corrosion detection device is adopted to evaluate the corrosion of the inorganic cementing material in the flowing karst water, and the method comprises the following steps:
s1, preparing karst water or sodium bicarbonate solution with the mass concentration of 1-5%;
s2, preparing an inorganic cementing material and placing the inorganic cementing material in a second box body;
s3, adding karst water or sodium bicarbonate solution into the first box body through the liquid adding port, starting the water pump, pumping the karst water or sodium bicarbonate solution in the first box body into the second box body through the water injection pipe, enabling the karst water or the sodium bicarbonate solution to flow through the inorganic cementing material to corrode the inorganic cementing material, and opening the water outlet to enable water to flow out of the water outlet after flowing through the inorganic cementing material;
and S4, after the corrosion is finished, detecting the corrosion depth, the breaking strength loss rate and the compressive strength loss rate of the inorganic cementing material.
In the embodiment of the present application, the method for detecting corrosion of an inorganic cementitious material in flowing karst water detects the flexural strength and the compressive strength of the inorganic cementitious material before evaluation, detects the flexural strength and the compressive strength of the inorganic cementitious material again after corrosion, and can calculate the flexural strength loss rate and the compressive strength loss rate according to the flexural strength and the compressive strength data before and after corrosion.
In some embodiments, during the evaluation, the pH in the first housing is measured using a pH meter, and if the pH is not between 6.8 and 8.4, the liquid in the first housing is drained through the drain port and the karst water or sodium bicarbonate solution is added to the first housing again.
In some embodiments, Ca in the karst water2+The mass concentration is 75-80 mg/L, HCO3 -The mass concentration is 205-215 mg/L, SO4 2-The mass concentration is 5-10 mg/L, Cl-The mass concentration is 4-5 mg/L.
In particular, the karst water is according to the literature according to Ca2+The mass concentration is 75-80 mg/L, HCO3 -The mass concentration is 205-215 mg/L, SO4 2-The mass concentration is 5-10mg/L，Cl-The composite solution prepared by mixing the materials with the mass concentration of 4-5 mg/L is not a solution of certain ions, so that several ions coexist.
In some embodiments, the pH of the karst water is adjusted to between 6.8 and 8.4 by using NaOH solution and acetic acid solution.
In some embodiments, the inorganic cementitious material is corroded by flowing water through the inorganic cementitious material, wherein the number of corrosion days is 60-360 d.
In some embodiments, the inorganic gel material includes a cement-based grout material, an alkali-activated grout material, a water glass grout material, and the like.
The method for detecting the corrosion of the inorganic cementitious material in flowing karst water according to the present application is further illustrated in the following specific examples.
Example 1
The corrosion detection method of the inorganic cementing material in the flowing karst water adopts the corrosion detection device to evaluate the corrosion of the inorganic cementing material in the flowing karst water, and comprises the following steps:
s1, adding sodium bicarbonate into water to prepare a sodium bicarbonate solution with the mass concentration of 5%;
s2, preparing an inorganic cementing material and placing the inorganic cementing material in a second box body;
s3, adding a sodium bicarbonate solution with the mass concentration of 5% into the first box body through the feeding port, starting a water pump, pumping the sodium bicarbonate solution into the second box body through the water injection pipe, enabling the sodium bicarbonate solution to flow through the inorganic cementing material to corrode the inorganic cementing material for 60 days, and opening the water discharge port to enable the sodium bicarbonate solution to flow through the inorganic cementing material and then flow out of the water discharge port;
s4, after the corrosion is finished, detecting the corrosion depth, the breaking strength loss rate and the compressive strength loss rate of the inorganic cementing material;
the preparation method of the inorganic cementing material comprises the following steps:
a1, mixing and stirring slag and water glass with a modulus of 2 according to the alkalinity of 4% to prepare slurry;
a2, mixing the slurry with sand according to a sand-to-cement ratio of 3:1, and then adding water to make the water-to-cement ratio be 0.32 to obtain a mortar material;
a3, injecting the mortar material into a mould with the size of 40 multiplied by 160mm, demoulding for 24 hours, and continuously curing for 28 days at the temperature of 20 ℃ and the relative humidity of more than 95 percent to obtain the inorganic cementing material.
Example 2
The corrosion detection method of the inorganic cementing material in the flowing karst water adopts the corrosion detection device to evaluate the corrosion of the inorganic cementing material in the flowing karst water, and comprises the following steps:
s1, preparing karst water, wherein Ca in the karst water2+The mass concentration is 75-80 mg/L, HCO3 -The mass concentration is 205-215 mg/L, SO4 2-The mass concentration is 5-10 mg/L, Cl-The mass concentration is 4-5 mg/L;
s2, preparing an inorganic cementing material and placing the inorganic cementing material in a second box body;
s3, adding the karst water into the first box body through the feeding port, starting the water pump, pumping the karst water into the second box body through the water injection pipe, enabling the karst water to flow through the inorganic cementing material to corrode the inorganic cementing material for 360d, and opening the water outlet to enable the karst water to flow through the inorganic cementing material and then flow out of the water outlet;
s4, after the corrosion is finished, detecting the corrosion depth, the breaking strength loss rate and the compressive strength loss rate of the inorganic cementing material;
the preparation method of the inorganic cementing material comprises the following steps:
a1, taking Portland cement as reference cement, mixing the reference cement with sand according to a sand-cement ratio of 3:1, and then adding water to enable the water-cement ratio to be 0.5 to obtain a cement mortar material;
a2, pouring the cement mortar material into a mould with the size of 40 multiplied by 160mm, demoulding for 24 hours, and continuously curing for 28 days at the temperature of 20 ℃ and the relative humidity of more than 95 percent to obtain the inorganic cementing material.
Example 3
The corrosion detection method of the inorganic cementing material in the flowing karst water adopts the corrosion detection device to evaluate the corrosion of the inorganic cementing material in the flowing karst water, and comprises the following steps:
s1, adding sodium bicarbonate into water to prepare a sodium bicarbonate solution with the mass concentration of 1%;
s2, preparing an inorganic cementing material and placing the inorganic cementing material in a second box body;
s3, adding a sodium bicarbonate solution with the mass concentration of 1% into the first box body through the feeding port, starting a water pump, pumping the sodium bicarbonate solution into the second box body through the water injection pipe, enabling the sodium bicarbonate solution to flow through the inorganic cementing material to corrode the inorganic cementing material for 56d, and opening the water discharge port to enable the sodium bicarbonate solution to flow through the inorganic cementing material and then flow out of the water discharge port;
s4, after the corrosion is finished, detecting the corrosion depth, the breaking strength loss rate and the compressive strength loss rate of the inorganic cementing material;
the preparation method of the inorganic cementing material comprises the following steps:
a1, taking Portland cement as reference cement, mixing the reference cement with sand according to a sand-cement ratio of 3:1, and then adding water to enable the water-cement ratio to be 0.5 to obtain a cement mortar material;
a2, pouring the cement mortar material into a mould with the size of 40 multiplied by 160mm, demoulding for 24 hours, and continuously curing for 28 days at the temperature of 20 ℃ and the relative humidity of more than 95 percent to obtain the inorganic cementing material.
Example 4
The corrosion detection method of the inorganic cementing material in the flowing karst water adopts the corrosion detection device to evaluate the corrosion of the inorganic cementing material in the flowing karst water, and comprises the following steps:
s1, preparing karst water, wherein Ca in the karst water2+The mass concentration is 75-80 mg/L, HCO3 -The mass concentration is 205-215 mg/L, SO4 2-The mass concentration is 5-10 mg/L, Cl-The mass concentration is 4-5 mg/L;
s2, preparing an inorganic cementing material and placing the inorganic cementing material in a second box body;
s3, adding the karst water into the first box body through the feeding port, starting the water pump, pumping the karst water into the second box body through the water injection pipe, enabling the karst water to flow through the inorganic cementing material to corrode the inorganic cementing material for 360d, and opening the water outlet to enable the karst water to flow through the inorganic cementing material and then flow out of the water outlet;
s4, after the corrosion is finished, detecting the corrosion depth, the breaking strength loss rate and the compressive strength loss rate of the inorganic cementing material;
the preparation method of the inorganic cementing material comprises the following steps:
a1, mixing and stirring slag and water glass with a modulus of 2 according to the alkalinity of 5% to prepare slurry;
a2, mixing the slurry with sand according to a sand-to-cement ratio of 3:1, and then adding water to make the water-to-cement ratio be 0.32 to obtain a mortar material;
a3, injecting the mortar material into a mould with the size of 40 multiplied by 160mm, demoulding for 24 hours, and continuously curing for 28 days at the temperature of 20 ℃ and the relative humidity of more than 95 percent to obtain the inorganic cementing material.
The inorganic gelled materials of examples 1-4 were tested for corrosion depth, breaking strength loss rate, and compressive strength loss rate, and the results are shown in table 1 below.
TABLE 1 Corrosion of inorganic gel materials in various examples
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. An inorganic cementitious material corrosion detection device in flowing karst water, comprising:
the first box body is provided with a liquid feeding port and a liquid discharging port;
the bottom of the second box body is provided with a water outlet;
one end of the water injection pipe extends into the second box body, the other end of the water injection pipe extends into the first box body, and the other end of the water injection pipe is communicated with a water pump positioned in the first box body;
and a probe of the pH meter extends into the first box body.
2. The apparatus for detecting corrosion of inorganic cementitious material in flowing karst water according to claim 1, wherein the second box is further provided with a plurality of water flood prevention holes on the side surface.
3. The apparatus for detecting corrosion of inorganic cementitious material in flowing karst water according to claim 1, wherein the internal volume of the first box is 2 to 4 times of the internal volume of the second box.
4. A method for detecting corrosion of an inorganic cementing material in flowing karst water is characterized in that the corrosion of the inorganic cementing material in the flowing karst water is evaluated by adopting the corrosion detection device according to any one of claims 1 to 3, and the method comprises the following steps:
preparing karst water or sodium bicarbonate solution with the mass concentration of 1-5%;
preparing an inorganic cementing material and placing the inorganic cementing material in a second box body;
adding karst water or sodium bicarbonate solution into the first box body through the liquid adding port, starting the water pump, pumping the karst water or the sodium bicarbonate solution in the first box body into the second box body through the water injection pipe, enabling the karst water or the sodium bicarbonate solution to flow through the inorganic cementing material to corrode the inorganic cementing material, and opening the water outlet to enable water to flow out of the water outlet after flowing through the inorganic cementing material;
and after the corrosion is finished, detecting the corrosion depth, the breaking strength loss rate and the compressive strength loss rate of the inorganic cementing material.
5. The method for detecting corrosion of inorganic cement in flowing karst water according to claim 4, wherein in the evaluation process, a pH meter is used for detecting the pH in the first box, if the pH is not between 6.8 and 8.4, the liquid in the first box is discharged through the discharge port, and the karst water or the sodium bicarbonate solution is added into the first box again.
6. The method for detecting corrosion of inorganic cement in flowing karst water according to claim 4, wherein Ca is in the karst water2+The mass concentration is 75-80 mg/L, HCO3 -The mass concentration is 205-215 mg/L, SO4 2-The mass concentration is 5-10 mg/L, Cl-The mass concentration is 4-5 mg/L.
7. The method for detecting the corrosion of the inorganic cementing material in the flowing karst water according to claim 4, wherein the inorganic cementing material is corroded by water flowing through the inorganic cementing material, and the number of corrosion days is 60-360 d.
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