CN115259738A - Special composite marine concrete anti-corrosion preservative and preparation method thereof - Google Patents
Special composite marine concrete anti-corrosion preservative and preparation method thereof Download PDFInfo
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- 239000003755 preservative agent Substances 0.000 title claims abstract description 67
- 239000004567 concrete Substances 0.000 title claims abstract description 57
- 230000002335 preservative effect Effects 0.000 title claims abstract description 45
- 239000002131 composite material Substances 0.000 title claims abstract description 34
- 238000005260 corrosion Methods 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 35
- 230000007797 corrosion Effects 0.000 claims abstract description 19
- 239000000843 powder Substances 0.000 claims abstract description 19
- 239000002956 ash Substances 0.000 claims abstract description 17
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 16
- 235000010755 mineral Nutrition 0.000 claims abstract description 16
- 239000011707 mineral Substances 0.000 claims abstract description 16
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000005543 nano-size silicon particle Substances 0.000 claims abstract description 13
- 239000002253 acid Substances 0.000 claims abstract description 11
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000010883 coal ash Substances 0.000 claims abstract description 10
- 239000000176 sodium gluconate Substances 0.000 claims abstract description 10
- 235000012207 sodium gluconate Nutrition 0.000 claims abstract description 10
- 229940005574 sodium gluconate Drugs 0.000 claims abstract description 10
- 239000005416 organic matter Substances 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 8
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims abstract description 7
- 159000000007 calcium salts Chemical class 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims description 8
- 239000011575 calcium Substances 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 241000609240 Ambelania acida Species 0.000 claims description 4
- 239000010905 bagasse Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 3
- 239000003245 coal Substances 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 239000010902 straw Substances 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 claims description 2
- 239000011148 porous material Substances 0.000 claims 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract description 22
- 238000010276 construction Methods 0.000 abstract description 2
- 238000005536 corrosion prevention Methods 0.000 abstract description 2
- 230000001737 promoting effect Effects 0.000 abstract description 2
- 239000004570 mortar (masonry) Substances 0.000 description 48
- 238000012360 testing method Methods 0.000 description 45
- 239000011083 cement mortar Substances 0.000 description 18
- 238000009792 diffusion process Methods 0.000 description 13
- 230000000694 effects Effects 0.000 description 12
- 230000002829 reductive effect Effects 0.000 description 9
- 229920001971 elastomer Polymers 0.000 description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 230000003628 erosive effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- RAFRTSDUWORDLA-UHFFFAOYSA-N phenyl 3-chloropropanoate Chemical compound ClCCC(=O)OC1=CC=CC=C1 RAFRTSDUWORDLA-UHFFFAOYSA-N 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 238000000692 Student's t-test Methods 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 230000003487 anti-permeability effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 150000001804 chlorine Chemical class 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000011396 hydraulic cement Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229910001961 silver nitrate Inorganic materials 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000012353 t test Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/61—Corrosion inhibitors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of marine corrosion prevention, and particularly relates to a special anti-corrosion preservative for composite marine concrete and a preparation method thereof. The composite marine concrete special-purpose anti-erosion preservative is prepared from the following raw materials in parts by mass: 16-20 parts of nano silicon powder, 3-5 parts of nitrite, 20 parts of calcium salt, 25-29 parts of coal ash, 13-15 parts of composite organic ash, 0.8 part of polycarboxylic acid, 0.2 part of sodium gluconate and 14-18 parts of superfine mineral powder. The corrosion-resistant preservative is prepared by mixing nano silicon powder, nitrite, calcium salt, coal ash, composite organic matter ash, polycarboxylic acid, sodium gluconate and superfine mineral powder in a proper proportion. The corrosion-resistant preservative is added into the concrete according to a certain proportion when the marine concrete is manufactured, so that the compressive strength and the flexural strength of the marine concrete can be improved, the corrosion of chloride ions in the marine environment can be improved, the preparation process is simple, and the marine concrete has an important application value in promoting the construction of marine environment infrastructures.
Description
Technical Field
The invention relates to the technical field of marine corrosion prevention, and particularly relates to a composite marine concrete special-purpose anti-corrosion preservative and a preparation method thereof.
Background
The marine concrete is concrete which is used in marine environment and is invaded by seawater or sea wind. The marine environment is a harsh corrosive environment, and if an effective protection means is not adopted for concrete serving in the marine environment, the concrete is likely to corrode and damage, and serious consequences are brought.
With the global large-scale development and utilization of ocean resources, it is necessary to pay attention to the durability of marine concrete. Under the marine environment, the anion corrosion phenomenon of the traditional concrete is obvious, and Cl which causes concrete chloride ion corrosion in seawater is used for common corrosion medium of the concrete - The highest content, so that the search and search for materials capable of effectively inhibiting the corrosion of concrete chloride ions is an effective way to solve the above problems.
The patent with the application number of CN201910594301.4 discloses an anticorrosive coating for marine concrete protection and a preparation method thereof. The anticorrosive paint disclosed in the patent is undeniably capable of achieving an anticorrosive effect, but the organic coating is easy to age, low in acid-base corrosion resistance, and short in service cycle due to the problem of adhesion between the paint and a concrete matrix.
Disclosure of Invention
The invention aims to provide a special composite marine concrete anti-corrosion preservative and a preparation method thereof.
In order to achieve the purpose, the invention provides the following technical scheme:
the composite marine concrete special-purpose anti-erosion preservative is prepared from the following raw materials in parts by mass: 16-20 parts of nano silicon powder, 3-5 parts of nitrite, 20 parts of calcium salt, 25-29 parts of coal ash, 13-15 parts of composite organic matter ash, 0.8 part of polycarboxylic acid, 0.2 part of sodium gluconate and 14-18 parts of superfine mineral powder.
Preferably, the nano silicon powder can pass through a screen with the aperture of 80 μm.
Preferably, the composite organic ash is residue after bark, straw, bagasse and coal are combusted; in the composite organic ash, by mass percent: 19.86% of K, 6.87% of P, 29.86% of Ca, 3.67% of Mg, 33.29% of Si, 2.12% of S, 1.26% of Fe, 0.38% of Mn, 0.49% of Cu, 0.83% of Zn, 0.44% of B and 0.75% of Mo.
Preferably, the ultrafine mineral powder is a powder which is formed by grinding high-temperature slag through a ball mill and can completely pass through a sieve with the aperture of 40 mu m; in the ultrafine mineral powder, by mass percent: caO content 33.66%, siO 2 40.96% of Al 2 O 3 7.59% of MgO 2.76% of Fe 2 O 3 2.25 percent of the total content, 11.95 percent of MnO and 0.72 percent of S.
The invention also provides a preparation method of the special anti-corrosion preservative for the composite marine concrete, which comprises the following steps:
(1-1) respectively weighing 16-20 parts of nano silicon powder, 3-5 parts of nitrite, 20 parts of calcium salt, 25-29 parts of coal ash, 13-15 parts of composite organic matter ash, 0.8 part of polycarboxylic acid, 0.2 part of sodium gluconate and 14-18 parts of superfine mineral powder according to the mass part ratio;
(1-2) stirring and mixing the raw material components uniformly at a slow speed by using a stirrer to obtain the anti-corrosion preservative.
The invention also provides application of the special anti-erosion preservative for the composite marine concrete, which is applied to preparing the marine concrete and comprises the following steps:
(2-1) weighing a preservative according to 3-10% of the mass of cement in the marine concrete;
(2-2) adding sand, cement and a preservative into a concrete mixer according to the mixing proportion of the conventional marine concrete, and uniformly mixing and stirring to obtain a dry mixed material of the marine concrete;
(2-3) stirring the dry marine concrete mixture obtained in the step (2-2), adding mixing water, and continuously stirring for 3-5min;
(2-4) pouring the mixture into a mold, placing the mold on a vibration table, vibrating for 30s, standing for 24h, and then demolding;
and (2-5) transferring the demolded concrete to a standard concrete curing room for curing after the demolding is finished, wherein the curing age is 28d, and obtaining the marine concrete doped with the preservative.
Compared with the prior art, the invention has the following beneficial effects:
the corrosion-resistant preservative is prepared by mixing nano silicon powder, nitrite, calcium salt, coal ash, composite organic matter ash, polycarboxylic acid, sodium gluconate and superfine mineral powder in a proper proportion. The corrosion-resistant preservative is added into the concrete according to a certain proportion when the marine concrete is manufactured, so that the compressive strength and the flexural strength of the marine concrete can be improved, the corrosion of chloride ions in the marine environment can be improved, the preparation process is simple, and the marine concrete has an important application value in promoting the construction of marine environment infrastructures.
Drawings
FIG. 1 shows the effect of different preservatives and their contents on the compressive strength of cement mortar;
FIG. 2 shows the effect of different preservatives and their contents on the flexural strength of cement mortar;
FIGS. 3-4 show the surface profile of KS 3-5;
FIG. 5 shows the results of the fast chloride electromigration test of cement mortars with different preservatives and their amounts.
Detailed Description
The technical scheme of the invention is clearly and completely described in the following.
In the following examples, the nano silicon powder can pass through a sieve with 80 μm aperture;
the composite organic ash is the residue of bark, straw, bagasse and coal after combustion; in the composite organic ash, by mass percent: 19.86% of K, 6.87% of P, 29.86% of Ca, 3.67% of Mg, 33.29% of Si, 2.12% of S, 1.26% of Fe, 0.38% of Mn, 0.49% of Cu, 0.83% of Zn, 0.44% of B and 0.75% of Mo;
the superfine mineral powder is prepared by grinding high-temperature furnace slag by a ball mill and can completely pass through a screen with the aperture of 40 mu mThe powder of (4); in the superfine mineral powder, by mass percent: caO content 33.66%, siO 2 40.96% of Al 2 O 3 7.59% of MgO, 2.76% of Fe 2 O 3 2.25 percent of the content, 11.95 percent of MnO and 0.72 percent of S;
polycarboxylic acids were purchased from Shandong Yonglida New materials technology, inc., model YLD-JSSFT;
the cement is P.I 42.5 portland cement;
the sand is IOS standard sand.
Example 1
The composite marine concrete special-purpose anti-corrosion preservative is prepared from the following raw materials in parts by mass: 20kg of nano silicon powder, 5kg of calcium nitrite, 20kg of calcium sulphoaluminate, 25kg of coal ash, 15kg of composite organic matter ash, 0.8kg of polycarboxylic acid, 0.2kg of sodium gluconate and 14kg of superfine mineral powder.
Example 2
The composite marine concrete special-purpose anti-erosion preservative is prepared from the following raw materials in parts by mass: 18kg of nano silicon powder, 4kg of calcium nitrite, 20kg of calcium sulphoaluminate, 27kg of coal ash, 14kg of composite organic matter ash, 0.8kg of polycarboxylic acid, 0.2kg of sodium gluconate and 16kg of superfine mineral powder.
Example 3
The composite marine concrete special-purpose anti-erosion preservative is prepared from the following raw materials in parts by mass: 16kg of nano silicon powder, 3kg of calcium nitrite, 20kg of calcium sulphoaluminate, 29kg of coal ash, 13kg of composite organic matter ash, 0.8kg of polycarboxylic acid, 0.2kg of sodium gluconate and 18kg of superfine mineral powder.
Example 4: influence of different preservatives and mixing amounts thereof on cement mortar strength
4.1 the formulation of cement mortar is shown in Table 1.
TABLE 1 Cement mortar compounding ratio of different preservatives and their mixing amount to cement mortar strength
4.2 test method (refer to GBT17671-1999 method for testing cement mortar Strength)
Test pieces of 40mm × 40mm × 160mm are prepared and tested, and the maintenance period is 28d.
The compression strength test adopts a TYE-300X type hydraulic cement pressure tester, and the bending strength test adopts a DKZ-5000 type electric bending tester.
4.3 test results
4.3.1 Effect of different preservatives and their mixing amounts on the compressive strength of cement mortar
The results are shown in FIG. 1 and Table 2.
TABLE 2 test data of different preservatives and their mixing amounts on compressive strength of cement mortar
| Sample numbering | Compressive strength (MPa) | Relative value of compressive strength |
| CS | 37.94 | 1 |
| KS1-3 | 38.72 | 1.02 |
| KS1-5 | 35.65 | 0.94 |
| KS1-8 | 29.08 | 0.77 |
| KS1-10 | 28.00 | 0.74 |
| KS2-3 | 38.25 | 1.01 |
| KS2-5 | 36.16 | 0.95 |
| KS2-8 | 27.04 | 0.71 |
| KS2-10 | 26.47 | 0.70 |
| KS3-3 | 39.30 | 1.04 |
| KS3-5 | 33.93 | 0.89 |
| KS3-8 | 32.06 | 0.85 |
| KS3-10 | 30.83 | 0.81 |
As can be seen from FIG. 1 and Table 2, under the condition of age of 28d, the compressive strength of the CS mortar of the control group is 37.94MPa, and the compressive strength of the mortar basically shows a tendency of increasing first and then decreasing with the increase of the addition amount of the preservative, wherein the compressive strength of all three preservatives reaches the highest when the addition amount is 3%, and the compressive strengths of the KS1-3, KS2-3 and KS3-3 mortars are respectively 38.72MPa, 38.25MPa and 39.3MPa, which are respectively improved by 2%, 1% and 4% relative to the compressive strength of the CS mortar, and wherein the compressive strength improvement effect of the KS3-3 mortar is the greatest. However, when the mixing amount is more than 3%, the compressive strength of the three kinds of preservative mortar is continuously reduced and is smaller than that of the common mortar.
4.3.2 Effect of different preservatives and their mixing amounts on the flexural strength of cement mortar
The results are shown in FIG. 2 and Table 3.
TABLE 3 test data of different preservatives and their mixing amounts on the flexural strength of cement mortar
| Sample numbering | Flexural strength (MPa) | Relative value of flexural strength |
| CS | 10.02 | 1.00 |
| KS1-3 | 10.97 | 1.09 |
| KS1-5 | 10.16 | 1.01 |
| KS1-8 | 8.87 | 0.89 |
| KS1-10 | 7.90 | 0.79 |
| KS2-3 | 10.31 | 1.03 |
| KS2-5 | 9.48 | 0.95 |
| KS2-8 | 9.37 | 0.94 |
| KS2-10 | 9.02 | 0.90 |
| KS3-3 | 10.41 | 1.04 |
| KS3-5 | 8.99 | 0.90 |
| KS3-8 | 8.68 | 0.87 |
| KS3-10 | 6.62 | 0.66 |
As can be seen from FIG. 2 and Table 3, under the condition of age of 28d, the flexural strength of the CS mortar in the control group is 10.02MPa, and the flexural strength of the mortar basically shows a tendency of increasing first and then decreasing with the increase of the addition amount of the preservative, wherein the flexural strength of all three preservatives reaches the highest when the addition amount is 3%, the flexural strengths of the KS1-3, KS2-3 and KS3-3 mortars are respectively 10.97MPa, 10.31MPa and 10.42MPa, and are respectively improved by 9%, 3% and 4% relative to the flexural strength of the CS mortar, and the improvement effect of the flexural strength of the KS1-3 mortar is the highest. However, when the mixing amount is more than 3%, the flexural strength of the three kinds of preservative mortar is continuously reduced and is smaller than that of the common mortar.
In conclusion, for the compressive strength and the flexural strength improvement effects, the compressive strength and the flexural strength of the mortar have certain improvement effects under the condition of 3% of the mixing amount of the three preservatives, wherein the compressive strength improvement effect of the KS3-3 mortar is most obvious and is improved by 4%; the fracture strength of the KS1-3 mortar is improved most obviously by 9 percent. When the mixing amount is more than 3 percent, the strength of the waterproof mortar is continuously reduced along with the increase of the mixing amount, wherein the reduction of the compressive strength of the KS2-10 mortar is most remarkable; the KS3-10 mortar exhibited the most significant reduction in flexural strength. Overall, the example 1 preservative had minimal impact on mortar strength compared to the preservatives of examples 2 and 3.
Example 5: influence of different preservatives and mixing amounts thereof on corrosion resistance of cement mortar
5.1 the proportions of the cement mortars are shown in Table 4.
TABLE 4 Cement mortar proportion of different preservatives and their mixing amount to cement mortar anti-corrosion influence
5.2 test methods
According to the regulations of GB/T50082-2009 test method for long-term performance and durability of ordinary concrete on rapid chloride ion electromigration test (RCM), the chloride ion diffusion coefficient of the preservative mortar is measured.
Pouring a cylindrical test block with the diameter of 100mm multiplied by 2000mm, moving the mould filled with the mortar to a vibration table, vibrating for 30s, and using a scraper to smooth the surface. And after the vibration is finished, the test block is kept stand for 24 hours and then is demoulded, after the demould is finished, the test block is numbered and labeled, and then the test block is transported to a standard curing room for curing, wherein the curing age is 28 days.
And cutting the bagasse ash mortar with the size of phi 100mm multiplied by 200mm during the maintenance age of 21 d. The specific process comprises the following steps: marking the positions 25mm thick on the upper side and the lower side of a cylindrical sample by using a black mark pen, cutting a test block 25mm thick from one end, then cutting 3 cylindrical samples with phi 100mm multiplied by 50mm to be used as test blocks for RCM tests, and continuously placing the test blocks in a standard curing room until the test is carried out at the age after relevant marks are made. The rest 1 test block with the thickness of 25mm is abandoned, in order to reduce the test error and ensure the accuracy of the test data, the specific test steps are as follows:
1. all the cut cylindrical test blocks with the diameter of 100mm multiplied by 50mm are placed in a vacuum water saturation machine to be saturated for 24 hours. And taking the test block out of the water saturation machine, washing out the residual calcium hydroxide on the surface of the test block, then loading the test block into the bottom of the rubber cylinder, and enabling the test block and the rubber cylinder to be in a sealed state by using a metal hoop.
2. The method comprises the steps of installing a rubber cylinder with a test block in a test tank, installing an anode plate in the rubber cylinder to press the test block, injecting 300ml of prepared potassium hydroxide solution containing 5% of sodium chloride in mass fraction and 0.3mol/L into the rubber cylinder until the potassium hydroxide solution is immersed on the surface of the test block and the anode plate, and then pouring 12L 0.3mol/L of sodium chloride solution into the test tank until the potassium chloride solution is flush with the liquid level of the solution in the rubber cylinder.
3. And (5) switching on a power supply of the chloride ion diffusion coefficient tester, and recording the initial temperature, the current value and the time for completing the power-on process. And after the electrifying time is over, recording the temperature and the current value again.
4. Taking out the test block from the rubber cylinder, washing the surface and wiping the test block clean, splitting the test block into two semi-cylinders by using a tool, immediately spraying silver nitrate solution with the concentration of 0.1mol/L to display an indicator on a fracture surface, drawing a contour line on a color development boundary by using a black mark pen after 15min, equally dividing the contour line into 10 parts along the axial direction of the test block, measuring the length from the contour line to the edge of the test block by using a vernier caliper, and recording and calculating the average value of the lengths to obtain the diffusion depth of the chloride ions. The formula for calculating the diffusion coefficient of the chloride ions of the mortar is as follows:
in the formula: d RCM Diffusion coefficient of chloride ions (m) 2 S); u-absolute value (V) of the voltage used; t-average temperature (. Degree. C.) of the anode solution; l-thickness of the test block (mm); x d -mean diffusion depth (mm); t-test time (h).
5.3 test results
5.3.1 test phenomena
In experiments, the surfaces of the mortar test blocks formed after the preservatives are mixed in the examples 1 and 2 are not obviously different from the surfaces of the common concrete test blocks, but the surfaces of the mortar test blocks formed after the preservatives are mixed in the example 3 have a porous phenomenon, as shown in figures 3-4, the possibility that the mixing of the preservatives in the example 3 can cause air bubbles in the mortar to be discharged, and then some porous characteristics are formed on the surfaces of the mortar.
5.3.2 results on resistance to chloride attack
The results of the rapid chloride ion electromigration tests for various corrosion inhibitors and their amounts of cement mortar are shown in fig. 5 and table 5.
TABLE 5 RCM test data of different preservatives and their mixing amounts to cement mortar
As can be seen from FIG. 5 and Table 5, the diffusion coefficient of chloride ion in the CS mortar of the control group was 3.90X 10 -11 m 2 S, compared with CS mortar of a control group, the addition of the preservative can effectively reduce the chloride ion diffusion coefficient of the mortar and improve the chlorine salt corrosion resistance of the mortar to a certain extent.
For the three preservative mortars, the chloride ion diffusion coefficient of the preservative mortar basically shows the trend of increasing after decreasing along with the increase of the mixing amount, the chloride ion diffusion coefficient is the minimum when the mixing amount of the three preservative mortars is 3 percent, and the chloride ion diffusion coefficients of KS1-3, KS2-3 and KS3-3 are respectively 1.29 multiplied by 10 -11 m 2 /S、1.57×10 -11 m 2 S and 1.02X 10 -11 m 2 The S is reduced by 67 percent, 60 percent and 74 percent relative to CS mortar respectively, the anti-permeability effect is very remarkable, and KS3-3 has the best resistance to chloride ion erosion.
However, when the mixing amount is more than 3%, the chloride ion diffusion coefficients of the three preservative mortars are increased to different degrees, which indicates that the permeation resistance of the mortars is continuously reduced, wherein the deterioration effect of the corrosion resistance of the preservative mortar in example 3 is most obvious along with the increase of the mixing amount compared with the preservative mortars in other examples. At 10%, the ratio of the diffusion coefficient of chloride ions of KS1-10, KS2-10 and KS3-10 was 2.63X 10 -11 m 2 /S、3.42×10 -11 m 2 S and 4.02X 10 -11 m 2 and/S, wherein KS1-10 and KS2-10 are reduced by 33% and 12% respectively relative to CS mortar, and KS3-10 mortar is improved by 3%, indicating that under the condition, the KS3-10 mortar has poorer erosion resistance than the ordinary mortar.
In conclusion, the three preservatives have the following anticorrosion effects on the mortar: example 1 > example 2 > example 3. For the three preservatives, the mixing amount is 3 percent, which is the best mixing amount, and the compressive strength, the breaking strength and the erosion resistance of KS1-3, KS2-3 and KS3-3 are effectively improved compared with those of common mortar, but the strength and the erosion resistance are continuously reduced along with the increase of the mixing amount. For strength, the strength of the three preservatives is reduced after the addition of more than 3 percent; with respect to the corrosion resistance, the corrosion resistance of the preservatives in the examples 1 and 2 can be reduced to a certain extent along with the increase of the mixing amount to 10%, but the corrosion resistance of the preservative in the example 3 along with the mixing amount of more than 5% is poorer than that of the common mortar. In general, the preservative effect of the embodiment 1 is best, and the optimal mixing amount is 3%.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (6)
1. The special composite marine concrete anti-corrosion preservative is characterized by being prepared from the following raw materials in parts by mass: 16-20 parts of nano silicon powder, 3-5 parts of nitrite, 20 parts of calcium salt, 25-29 parts of coal ash, 13-15 parts of composite organic matter ash, 0.8 part of polycarboxylic acid, 0.2 part of sodium gluconate and 14-18 parts of superfine mineral powder.
2. The special composite marine concrete anti-corrosion preservative as claimed in claim 1, wherein all of the nano silicon powder can pass through a sieve with a pore size of 80 μm.
3. The special corrosion-resistant preservative for composite marine concrete according to claim 1, wherein the composite organic ash is residue after combustion of bark, straw, bagasse and coal; in the composite organic ash, by mass percent: 19.86% of K, 6.87% of P, 29.86% of Ca, 3.67% of Mg, 33.29% of Si, 2.12% of S, 1.26% of Fe, 0.38% of Mn, 0.49% of Cu, 0.83% of Zn, 0.44% of B and 0.75% of Mo.
4. The special composite marine concrete anti-corrosion preservative as claimed in claim 1, wherein the ultrafine mineral powder is a powder which is prepared by grinding high-temperature slag through a ball mill and can completely pass through a screen with a pore size of 40 μm; in the ultrafine mineral powder, by mass percent: caO content 33.66%, siO 2 40.96% of Al 2 O 3 7.59% of MgO 2.76% of Fe 2 O 3 2.25 percent of the total content, 11.95 percent of MnO and 0.72 percent of S.
5. The preparation method of the special composite marine concrete anti-corrosion preservative according to claim 1, characterized by comprising the following steps:
(1-1) respectively weighing 16-20 parts of nano silicon powder, 3-5 parts of nitrite, 20 parts of calcium salt, 25-29 parts of coal ash, 13-15 parts of composite organic matter ash, 0.8 part of polycarboxylic acid, 0.2 part of sodium gluconate and 14-18 parts of superfine mineral powder according to the mass part ratio;
(1-2) stirring and mixing the raw material components uniformly at a slow speed by using a stirrer to obtain the anti-corrosion preservative.
6. The application of the special anti-corrosion preservative for the composite marine concrete according to claim 1 in preparing the marine concrete is characterized by comprising the following steps of:
(2-1) weighing a preservative according to 3-10% of the mass of cement in the marine concrete;
(2-2) adding sand, cement and a preservative into a concrete mixer according to the mixing proportion of the conventional marine concrete, and uniformly mixing and stirring to obtain a dry mixed material of the marine concrete;
(2-3) stirring the dry marine concrete mixture obtained in the step (2-2), adding mixing water, and continuing stirring for 3-5min;
(2-4) pouring the mixture into a mold, placing the mold on a vibration table, vibrating for 30s, standing for 24h, and then demolding;
and (2-5) transferring the demolded concrete to a standard concrete curing room for curing for 28 days to obtain the marine concrete doped with the preservative.
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| CN101811840A (en) * | 2010-04-20 | 2010-08-25 | 南京工业大学 | Anti-corrosion additive for marine concrete |
| CN102126842A (en) * | 2011-03-17 | 2011-07-20 | 浙江五龙化工股份有限公司 | Concrete preservative |
| CN104176964A (en) * | 2013-05-27 | 2014-12-03 | 陕西通宇新材料有限公司 | Concrete composite antiseptic |
| CN108947412A (en) * | 2018-09-05 | 2018-12-07 | 河海大学 | A kind of ecology resistance anti-corrosion maritime concrete of rust type seawater sea sand and preparation method thereof |
| CN112759306A (en) * | 2020-12-31 | 2021-05-07 | 中铁十八局集团有限公司 | Fly ash-based chlorine salt resistant mortar and preparation method thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101811840A (en) * | 2010-04-20 | 2010-08-25 | 南京工业大学 | Anti-corrosion additive for marine concrete |
| CN102126842A (en) * | 2011-03-17 | 2011-07-20 | 浙江五龙化工股份有限公司 | Concrete preservative |
| CN104176964A (en) * | 2013-05-27 | 2014-12-03 | 陕西通宇新材料有限公司 | Concrete composite antiseptic |
| CN108947412A (en) * | 2018-09-05 | 2018-12-07 | 河海大学 | A kind of ecology resistance anti-corrosion maritime concrete of rust type seawater sea sand and preparation method thereof |
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