CN113213806A - Delayed permeation type core-shell structure chloride ion curing agent and preparation method thereof - Google Patents
Delayed permeation type core-shell structure chloride ion curing agent and preparation method thereof Download PDFInfo
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- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 title claims abstract description 97
- 239000011258 core-shell material Substances 0.000 title claims abstract description 52
- 230000003111 delayed effect Effects 0.000 title claims abstract description 43
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 52
- 239000004568 cement Substances 0.000 claims abstract description 36
- 150000004645 aluminates Chemical class 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 14
- 230000035515 penetration Effects 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 230000036571 hydration Effects 0.000 claims abstract description 9
- 238000006703 hydration reaction Methods 0.000 claims abstract description 9
- 235000010410 calcium alginate Nutrition 0.000 claims abstract description 6
- 239000000648 calcium alginate Substances 0.000 claims abstract description 6
- 229960002681 calcium alginate Drugs 0.000 claims abstract description 6
- OKHHGHGGPDJQHR-YMOPUZKJSA-L calcium;(2s,3s,4s,5s,6r)-6-[(2r,3s,4r,5s,6r)-2-carboxy-6-[(2r,3s,4r,5s,6r)-2-carboxylato-4,5,6-trihydroxyoxan-3-yl]oxy-4,5-dihydroxyoxan-3-yl]oxy-3,4,5-trihydroxyoxane-2-carboxylate Chemical compound [Ca+2].O[C@@H]1[C@H](O)[C@H](O)O[C@@H](C([O-])=O)[C@H]1O[C@H]1[C@@H](O)[C@@H](O)[C@H](O[C@H]2[C@H]([C@@H](O)[C@H](O)[C@H](O2)C([O-])=O)O)[C@H](C(O)=O)O1 OKHHGHGGPDJQHR-YMOPUZKJSA-L 0.000 claims abstract description 6
- 239000004567 concrete Substances 0.000 claims description 34
- 239000000843 powder Substances 0.000 claims description 17
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 16
- 235000010413 sodium alginate Nutrition 0.000 claims description 16
- 239000000661 sodium alginate Substances 0.000 claims description 16
- 229940005550 sodium alginate Drugs 0.000 claims description 16
- 239000007787 solid Substances 0.000 claims description 15
- 238000001291 vacuum drying Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 10
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 8
- 238000007873 sieving Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 4
- 229920006395 saturated elastomer Polymers 0.000 claims description 4
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 230000008595 infiltration Effects 0.000 claims 3
- 238000001764 infiltration Methods 0.000 claims 3
- 230000005012 migration Effects 0.000 abstract description 20
- 238000013508 migration Methods 0.000 abstract description 20
- 238000011065 in-situ storage Methods 0.000 abstract description 6
- 238000010521 absorption reaction Methods 0.000 abstract description 5
- 150000003839 salts Chemical class 0.000 abstract description 5
- 230000008961 swelling Effects 0.000 abstract description 5
- 239000007864 aqueous solution Substances 0.000 abstract description 2
- 239000003292 glue Substances 0.000 abstract 1
- 230000005923 long-lasting effect Effects 0.000 abstract 1
- 239000002775 capsule Substances 0.000 description 13
- 229910000831 Steel Inorganic materials 0.000 description 12
- 230000000694 effects Effects 0.000 description 12
- 239000000243 solution Substances 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- 239000011162 core material Substances 0.000 description 10
- 238000012360 testing method Methods 0.000 description 10
- 230000007797 corrosion Effects 0.000 description 9
- 238000005260 corrosion Methods 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 7
- 239000011257 shell material Substances 0.000 description 7
- 239000000047 product Substances 0.000 description 5
- 239000011150 reinforced concrete Substances 0.000 description 5
- 239000000460 chlorine Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 229910001424 calcium ion Inorganic materials 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 229910052602 gypsum Inorganic materials 0.000 description 3
- 239000010440 gypsum Substances 0.000 description 3
- 239000012466 permeate Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- ULGYAEQHFNJYML-UHFFFAOYSA-N [AlH3].[Ca] Chemical compound [AlH3].[Ca] ULGYAEQHFNJYML-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229910001653 ettringite Inorganic materials 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 235000014653 Carica parviflora Nutrition 0.000 description 1
- 241000243321 Cnidaria Species 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000013556 antirust agent Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000002969 artificial stone Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 229920006334 epoxy coating Polymers 0.000 description 1
- 238000007716 flux method Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000002608 ionic liquid Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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
Landscapes
- 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
本发明涉及一种延迟渗透型核壳结构氯离子固化剂及其制备方法，所述固化剂为球形，具有核壳结构，核芯为铝酸盐水泥水化产物，壳壁为海藻酸钙凝胶。本发明提供的延迟渗透型核壳结构氯离子固化剂可以显著提升氯离子原位固化能力。所述核壳结构材料加入水泥基材料中，通过吸水溶胀，氯离子经壳表面水溶液迁移通道缓慢渗透至结构内部，与铝酸盐水泥水化产物反应，形成Friedel’s盐，实现对自由氯离子的长效固化。The invention relates to a delayed penetration type core-shell structure chloride ion curing agent and a preparation method thereof. The curing agent is spherical and has a core-shell structure. The core is an aluminate cement hydration product and the shell wall is a calcium alginate cement glue. The delayed penetration type core-shell structure chloride ion curing agent provided by the invention can significantly improve the in-situ curing ability of chloride ions. The core-shell structural material is added to the cement-based material, and through water absorption and swelling, chloride ions slowly penetrate into the interior of the structure through the migration channel of the aqueous solution on the surface of the shell, and react with the aluminate cement hydration product to form Friedel's salt. Long lasting cure.
Description
Technical Field
The invention belongs to the technical field of mortar, concrete or artificial stone using organic materials as active ingredients, and relates to a delayed permeation type core-shell structure chloride ion curing agent and a preparation method thereof.
Background
In the process of ocean engineering construction, ocean resources such as sea sand, coral sand and the like are increasingly concerned by the field of building engineering. However, the chloride ions in these marine resources can diffuse and migrate in the concrete, and the chloride ions reaching the surface of the steel bars can damage the passive film on the surface of the steel bars, resulting in corrosion of the steel bars. In addition, in the chlorine-rich environment such as ocean or deicing salt, chloride ions can permeate and migrate to the surface of the steel bar from the outside through concrete pores, so that the corrosion risk is increased, and the durability of the reinforced concrete structure is reduced.
The common solution to the problem of corrosion of concrete caused by free chloride ions is to use stainless steel, epoxy steel bars, rust inhibitors, etc., but these methods also have some problems: stainless steel is expensive; the bonding strength between the epoxy steel bars and the cement is weak, and the epoxy coating is easy to damage in the transportation process; the antirust agent forms a layer of protective film on the surface of the steel bar to prevent chloride ions from contacting with the steel bar, but the concentration of free chloride ions on the surface of the steel bar is still high, and the corrosion risk still exists in the area where the passive film is weak.
As a novel approach for solving the problem that free chloride ions corrode steel bars in reinforced concrete, the chloride ion curing is regarded as the most potential method for eliminating the corrosion risk of the steel bars, and the main principle of the method is in-situ curing or dynamic migration. In-situ curing is mainly to convert chloride ions into non-free chloride ions by physical adsorption or chemical combination by using cement hydration products. The dynamic migration resistance means that the migration of chloride ions is hindered in the dynamic process by improving the migration resistance of the chloride ions. However, in the existing chloride ion curing agent curing mode, the chlorine fixing capacity of a physical adsorption mode is unstable, the chlorine fixing effect of a dynamic migration blocking mode is low, and the chemical combination method easily consumes a large amount of gypsum at the early stage to react to form ettringite and influence the working stability of the system, so that the high-efficiency, stable and long-acting curing of chloride ions cannot be well realized.
The delayed permeation type core-shell structure chloride ion curing agent provided by the invention is based on dual mechanisms of in-situ curing and dynamic migration resistance, and can realize long-acting curing of free chloride ions on the basis of ensuring the stable working performance of concrete by utilizing the delayed chloride ion permeation effect of the core-shell structure.
Disclosure of Invention
In view of the above, the present invention is directed to a delayed permeation type core-shell structure chloride ion curing agent and a preparation method thereof, so as to reduce the risk of corrosion of steel bars due to chloride ion corrosion in reinforced concrete.
In order to achieve the above technical objects, the present invention provides the following technical solutions.
A delayed penetration type core-shell structure chloride ion curing agent is spherical and has a core-shell structure, wherein the core is an aluminate cement hydration product, and the shell wall is calcium alginate gel.
According to the scheme, the radius of the core is 5-50 mu m, and the thickness of the shell wall is 50-150 mu m.
The invention also comprises a preparation method of the delayed permeation type core-shell structure chloride ion curing agent, wherein the curing agent is obtained by reacting aluminate cement powder with a sodium alginate solution and curing in a saturated calcium hydroxide solution, and the preparation method comprises the following steps:
1) adding 50-100 parts by weight of sodium alginate solution into a container, slowly adding 20-30 parts by weight of aluminate cement powder under the stirring condition, and fully stirring for 5-10 min to obtain a mixed solid formed by gel-coated aluminate cement;
2) immersing the mixed solid formed by the gel coated aluminate cement obtained in the step 1) in a saturated calcium hydroxide solution for curing, then taking out, then putting the mixed solid in a vacuum drying oven for vacuum drying, crushing and grinding the dried solid, and sieving to obtain the delayed permeation type core-shell structure chloride ion curing agent.
According to the scheme, the median particle size of the aluminate cement powder in the step 1) is less than 15 microns.
According to the scheme, the sodium alginate solution in the step 1) is prepared by adding sodium alginate powder into deionized water and stirring for 12-24 hours, and the mass percentage concentration is 2-3%. In the step 1), the sodium alginate solution is mixed with the aluminate cement powder, calcium ions dissolved out by the reaction of the aluminate cement powder and water rapidly perform an ion exchange reaction with the sodium alginate coated on the surface of the powder, and calcium alginate gel is generated.
According to the scheme, the curing conditions in the step 2) are as follows: standing for 18-24 h at 15-30 ℃.
According to the scheme, the vacuum drying conditions in the step 2) are as follows: the vacuum drying temperature is 35-40 ℃, and the vacuum drying time is 24-48 h.
According to the scheme, the sieving in the step 2) is 100-mesh sieving.
The invention also comprises a using method of the delayed permeation type core-shell structure chloride ion curing agent, which specifically comprises the following steps: and adding the delayed permeation type core-shell structure chloride ion curing agent into concrete, wherein the doping amount of the delayed permeation type core-shell structure chloride ion curing agent is 5-8% of the total mass of the cementing material in the concrete.
The invention designs a delayed permeation type core-shell structure chloride ion curing agent based on the free chloride ion in-situ curing and dynamic migration blocking mechanism in the cement-based material, and the capability of curing free chloride ions is obvious and durable. The curing agent is of a core-shell structure, the capsule wall material mainly comprises calcium alginate gel, and the curing agent has the effects of water absorption swelling, isolation protection and permeation delay. The calcium alginate gel formed by the reaction of calcium ions dissolved out after the reaction of aluminate cement powder and water and the sodium alginate is used as the capsule wall structure of the chloride ion curing agent with the delayed permeation type core-shell structure, the capsule wall has stable property, the internal substances are not easy to flow out, and the capsule core material has a stable wrapping protection effect. The capsule core material mainly comprises calcium-aluminum layered structure compounds, and has the effect of curing chloride ions. The main mineral component of the aluminate cement powder is CA which is immersed and saturated after being wrapped by the capsule wallCuring in calcium hydroxide solution to fully hydrate aluminate cement, wherein the hydration product is mainly CAH10The volume is expanded, so that the embedding effect of the components of the capsule wall and the capsule core material is improved, and the curing efficiency of the capsule wall material is further improved. On the other hand, calcium ions in saturated calcium hydroxide solution penetrate to the surface of the capsule core material component through the capsule wall to provide a calcium source, and CAH10React to form more calcium-aluminum layered structure compound C2AH8、C4AH13Etc. CAH10、C2AH8、C4AH13The ionic liquid can perform intercalation reaction with chloride ions, and perform ion exchange reaction between interlayer OH & lt- & gt and Cl & lt- & gt to form Friedel's salt, so as to realize chemical solidification of the chloride ions.
The delayed penetration type core-shell structure chloride ion curing agent provided by the invention is added into a cement-based material as an additive, due to the protection effect of a capsule wall, the problem that the components of the capsule core material react with gypsum with the effect of adjusting the setting time quickly to generate ettringite to influence the working stability of a system is avoided, and through water absorption and swelling, on one hand, the migration of chloride ions in a concrete pore structure is blocked to realize the dynamic migration of free chloride ions, on the other hand, external ions gradually penetrate into the core-shell structure, and the chloride ions also slowly permeate into the structure through a shell surface aqueous solution migration channel to react with an aluminate cement hydration product to form Friedel's salt, so that the high-efficiency and long-acting curing of the free chloride ions is realized.
Compared with the prior art, the delayed penetration type core-shell structure chloride ion curing agent has the following advantages:
1. the delayed permeation type core-shell structure chloride ion curing agent provided by the invention can obviously improve the in-situ curing capability of chloride ions. The core-shell structure material is added into a cement-based material, and through water absorption and swelling, chloride ions slowly permeate into the structure through a shell surface water solution migration channel to react with aluminate cement hydration products to form Friedel's salt, so that long-acting curing of free chloride ions is realized.
2. The delayed permeation type core-shell structure chloride ion curing agent can improve the migration resistance of a concrete structure to chloride ions. The core-shell structure material is added into concrete to block the migration of chloride ions in a concrete pore structure through water absorption and swelling, so that the dynamic migration of free chloride ions is realized.
3. The delayed permeation type core-shell structure chloride ion curing agent can effectively ensure the working stability of concrete, and the delayed permeation effect of the core-shell structure and the protection effect of a shell material realize chloride ion curing and simultaneously avoid the influence on the working performance of the concrete caused by the direct reaction of gypsum which is a component of a cement-based material and is in the initial stage of hydration due to the direct addition of the component of the core material.
Detailed Description
The method of use is given below by way of specific application examples, but the embodiments of the present invention are not limited thereto.
The preparation method of the sodium alginate solution used in the embodiment of the invention comprises the following steps: adding sodium alginate powder into deionized water, and stirring in a magnetic stirrer for 12-24 h to obtain the sodium alginate powder.
Example 1
A delayed permeation type core-shell structure chloride ion curing agent is specifically prepared by the following steps:
1) pouring 50 parts by weight of sodium alginate solution (with mass percentage concentration of 2%) into a beaker, slowly adding 20 parts by weight of dry-ground and sieved aluminate cement powder with the median particle size of 10 mu m under the condition of uniform stirring, and fully stirring for 5min to fully react to obtain mixed solid formed by gel-coated aluminate cement;
2) immersing the mixed solid formed by the gel coated aluminate cement obtained in the step 1) in a saturated calcium hydroxide solution, maintaining at 15 ℃ for 18h, taking out, putting the mixed solid in a vacuum drying oven, drying at 40 ℃ for 24h, crushing and grinding the dried solid, and sieving with a 100-mesh sieve to obtain the delayed permeation type core-shell structure chloride ion curing agent.
The curing agent prepared in this example was tested to be spherical in form with a core radius of about 40 μm and a shell wall thickness of about 100 μm.
Example 2
A delayed permeation type core-shell structure chloride ion curing agent is specifically prepared by the following steps:
1) pouring 100 parts by weight of sodium alginate solution (with mass percentage concentration of 3%) into a beaker, slowly adding 30 parts by weight of dry-ground sieved aluminate cement powder with a median particle size of 10 microns under the condition of uniform stirring, and fully stirring for 10min to fully react to obtain mixed solid formed by gel-coated aluminate cement;
2) immersing the mixed solid formed by the gel coated aluminate cement obtained in the step 1) in a saturated calcium hydroxide solution, maintaining at 30 ℃ for 24h, taking out, putting the mixed solid in a vacuum drying oven, vacuum-drying at 40 ℃ for 48h, crushing and grinding the dried solid, and sieving with a 100-mesh sieve to obtain the delayed permeation type core-shell structure chloride ion curing agent.
The curing agent prepared in this example was tested to be spherical in form with a core radius of about 20 μm and a shell wall thickness of about 120 μm.
Application examples
In order to test the effect of the delayed permeation type core-shell structure chloride ion curing agent prepared in the embodiment on curing of endogenous chloride ions in concrete, taking concrete as an example, an experimental process of simulating that a certain amount of chloride ions are contained in concrete and curing the concrete by utilizing the self-bonding capability of a cement-based material is simulated. Wherein, the content of chloride ions is 0.12 percent of the mass of the sand. Concrete containing the chloride ion curing agents prepared in example 1 and example 2 (the mixing amount of the two delayed permeation type core-shell structure chloride ion curing agents is 5% and 8% of the total amount of the cementing materials in the concrete) was compared with a blank control group. Concrete samples were prepared using the raw materials shown in table 1.
TABLE 1
Calculating the total chloride ion content C in the concrete according to the added chloride ionst. Then, according to the water conservancy industry standard SL 352-2006-hydraulic concrete test procedure, determining the content C of the water-soluble free chloride ions in the concretef，CtAnd CfThe difference is the amount of concrete curing chloride ions Cb。CbAnd CtThe ratio of (A) to (B) is the curing rate of the chloride ions. The test results are shown in table 2.
TABLE 2
The results in Table 2 show that, compared with the blank control group, when the chloride ion curing agents prepared in examples 1 and 2 are added, the 1d chloride ion curing rate is improved by 5-10%, and the 28d chloride ion curing rate is improved by 40-50%, both of which can effectively improve the chloride ion curing rate of concrete.
In order to test the influence of the delayed permeation type core-shell structure chloride ion curing agent prepared by the embodiment of the invention on the migration resistance of free chloride ions of concrete, an electric flux method is adopted to characterize the migration resistance of the sample of the chloride ions according to the electric flux and the chloride ion migration coefficient of the sample when the common concrete sample reaches the specified curing age. The raw material formulation is shown in table 3.
TABLE 3
According to the standard of ASTMC1202 type electric flux tester operating rules, after a cylindrical concrete test piece with the diameter of 100mm multiplied by 50mm is saturated in vacuum, a direct current voltage of 60V is applied to the axial direction of the test piece, and NaOH solution with the concentration of 0.3mol/L and NaCl solution with the concentration of 3% are respectively placed in test grooves at the two sides of a positive electrode and a negative electrode of the test piece. And recording the total electric quantity Q value of the concrete samples 6h passing through the test piece in 28d and 56d, namely the electric flux of the test piece. The test results are shown in table 4.
TABLE 4
The results in Table 4 show that the delayed permeation type core-shell structure chloride ion curing agent prepared by the embodiment of the invention has a remarkable effect in improving the chloride ion migration resistance of concrete, and can improve the durability of reinforced concrete in a chloride ion corrosion environment. Therefore, the delayed permeation type core-shell structure chloride ion curing agent can improve the curing capability and migration resistance of concrete chloride ions for a long time, improve the durability of reinforced concrete in a chloride ion corrosion environment, prolong the service life and have great economic and social benefits.
Claims (9)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113968710A (en) * | 2021-11-01 | 2022-01-25 | 青岛青建新型材料集团有限公司 | A kind of anti-corrosion marine concrete with self-healing function and preparation method and application thereof |
| CN114368942A (en) * | 2021-12-20 | 2022-04-19 | 宁波磐固工程技术有限公司 | Inorganic cement osmotic crystallization additive and production process thereof |
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2021
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| CN113968710A (en) * | 2021-11-01 | 2022-01-25 | 青岛青建新型材料集团有限公司 | A kind of anti-corrosion marine concrete with self-healing function and preparation method and application thereof |
| CN114368942A (en) * | 2021-12-20 | 2022-04-19 | 宁波磐固工程技术有限公司 | Inorganic cement osmotic crystallization additive and production process thereof |
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Application publication date: 20210806 |