CN113698131A - Modified high-sulfur-resistance corrosion agent and preparation method thereof - Google Patents
Modified high-sulfur-resistance corrosion agent and preparation method thereof Download PDFInfo
- Publication number
- CN113698131A CN113698131A CN202111086272.4A CN202111086272A CN113698131A CN 113698131 A CN113698131 A CN 113698131A CN 202111086272 A CN202111086272 A CN 202111086272A CN 113698131 A CN113698131 A CN 113698131A
- Authority
- CN
- China
- Prior art keywords
- sulfur
- concrete
- modified high
- preparation
- corrosion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/06—Oxides, Hydroxides
- C04B22/062—Oxides, Hydroxides of the alkali or alkaline-earth metals
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- 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
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2015—Sulfate resistance
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention discloses a preparation method of a modified high-sulfur-resistance corrosion agent, which comprises the following steps: 1) uniformly dispersing sodium citrate, sodium benzoate and a silicone oil hydrophobic material in water, and heating and swelling the obtained mixed solution in a protective atmosphere; then heating to 55-60 ℃, adding vinyl bis stearamide, and carrying out heat preservation treatment to obtain a sulfur corrosion resistant component; 2) and mixing the obtained sulfur corrosion resistant component with the Cleox aqueous solution, adding lithium hydroxide, and stirring at 45-60 ℃ to obtain the modified high sulfur corrosion resistant agent. The modified high-sulfur-resistance corrosion inhibitor can effectively reduce the generation of calcium sulfate and ettringite, can participate in hydration reaction, improves the compactness of concrete and promotes the stable development of strength.
Description
Technical Field
The invention belongs to the technical field of functional materials, and particularly relates to a modified high-sulfur-resistance corrosion inhibitor and a preparation method thereof.
Background
In recent years, sulfate corrosion damage of concrete has become an important factor affecting the service life of concrete engineering structures such as roads and bridges, and for concrete structures in an environment with high sulfate corrosion and large variation range of ambient temperature and humidity for a long time, the degree of sulfate corrosion damage is large and the speed is relatively high: on one hand, sulfate ions invade into the concrete to react with hardened set cement, and according to different concentrations of sulfate ions in an erosion solution, expansive substances such as ettringite, gypsum, calcium carbothiosilicate and the like are respectively generated, and the substances are accumulated and expanded to cause cracking of the surface of the concrete and reduce the cementing capacity of the set cement to cause the surface of the concrete to peel off layer by layer, so that the strength and the durability of the concrete are influenced; on the other hand, the temperature or relative humidity of the corrosion environment changes repeatedly, and when a large amount of sodium ions and magnesium ions exist in the corrosion solution, salt crystallization and swelling usually occur, so that concrete cracking and destruction are caused. The existing sulfur-resistant corrosion agent is mainly prepared from powder materials such as fly ash, mineral powder and silica fume, but the concrete corrosion resistance is limited due to the large use amount and the poor dispersibility of solid powder materials.
Disclosure of Invention
The invention mainly aims to provide a novel liquid high-sulfur-resistance corrosion inhibitor, which can effectively prevent calcium hydroxide and calcium silicate hydrate gel from dissolving out, optimize gel pores and concrete microporous structures of concrete, improve the self compactness of the concrete, achieve the aim of preventing external sulfate and water from entering the concrete, further weaken the corrosion activity of the sulfate and effectively improve the durability of the concrete.
In order to achieve the purpose, the invention adopts the technical scheme that:
a preparation method of a modified high-sulfur-resistant corrosion agent comprises the following steps:
1) uniformly dispersing sodium citrate, sodium benzoate and a silicone oil hydrophobic material in water, and heating and swelling the obtained mixed solution in a protective atmosphere; then heating to 55-60 ℃, adding vinyl bis stearamide, and carrying out heat preservation treatment to obtain a sulfur corrosion resistant component;
2) and mixing the obtained sulfur corrosion resistant component with the Cleox aqueous solution, adding a lithium hydroxide solution, and stirring at 45-60 ℃ to obtain the modified high sulfur corrosion resistant agent.
In the scheme, the silicone oil hydrophobic material is n-octyl triethoxysilane.
In the scheme, the molar ratio of the sodium citrate, the sodium benzoate, the silicone oil hydrophobic material and the vinyl bis-stearamide is (0.6-1.4): (22-26): (0.3-0.4): 0.1-0.2).
In the scheme, the concentration of the sodium citrate introduced into the sulfur corrosion resistant component is 0.04-2 mol/L.
In the above scheme, the protective atmosphere may be nitrogen, argon or helium.
In the scheme, the heating swelling temperature is 45-50 ℃, and the time is 15-60 min.
In the scheme, the heat preservation treatment time in the step 1) is 15-50 min.
In the scheme, the solid content of the Cleox aqueous solution is 20-40%.
In the scheme, the concentration of the lithium hydroxide solution is 0.5-3 wt%.
In the scheme, the volume ratio of the sulfur corrosion inhibitor to the Cleox aqueous solution to the lithium hydroxide solution is 80-90 (6-20) to 2-4.
In the scheme, the stirring treatment time in the step 2) is 30-60 min.
Preferably, the stirring treatment adopts ultrasonic stirring treatment or ultrasonic oscillation means.
The modified high-sulfur-resistance corrosion inhibitor prepared according to the scheme is applied to preparation of concrete, wherein the modified high-sulfur-resistance corrosion inhibitor comprises the following components in percentage by mass: 7-10% of cement, 4-6% of fly ash, 2-3% of mineral powder, 1-2% of tuff powder, 30-36% of sand, 42-50% of stone, 4-6% of water and 2-3% of modified anti-sulfur corrosion agent; 0.02-0.06% of externally-doped high-performance water reducing agent.
Compared with the prior art, the invention has the beneficial effects that:
1) according to the invention, the alkalinity is improved by introducing the lithium hydroxide into the sulfur corrosion inhibitor, so that the lithium hydroxide is beneficial to the early dissolution and hydration of the mineral admixture in the cement concrete, and the lithium hydroxide and the sodium citrate act together, and are particularly uniformly adsorbed on the surfaces of various hydration products in the later development stage of the cement concrete, the dissolution and precipitation of calcium hydroxide and hydrated calcium silicate gel are relieved and prevented, and the generation of calcium sulfate and ettringite is effectively reduced; the introduced sodium benzoate and the silicone oil hydrophobic material are closely adsorbed with each other, which is beneficial to filling and reducing macropores in concrete, reducing pore diameter and forming stable-size micropores, can relieve stress effect caused by salt crystallization or ice crystallization, improves salt crystallization resistance and freeze-thaw resistance of the concrete, and simultaneously reduces the permeability of an erosion solution and improves the erosion resistance of sulfate under the action pressure of a capillary; the lithium hydroxide is cooperated with other sulfur corrosion resisting agent components to effectively inhibit the expansion of hydration products in the later stage of concrete hydration, prevent the concrete from cracking and peeling and further improve the sulfate corrosion resistance; in addition, the introduction of the Cleox can further reduce the absorption and permeation of sulfate ions, improve the sulfate corrosion resistance of concrete and enhance the durability.
2) The modified high-sulfur-resistance corrosion inhibitor can react with substances (aluminum ions and the like) with catalytic activity in concrete to generate micro-expansive gel substances (garnet and the like), and the micro-expansive gel substances are filled into gel holes and concrete microporous structures of the concrete, so that the self compactness of the concrete is improved, and the aim of preventing external sulfate and water from entering the concrete is fulfilled; meanwhile, the provided alkaline condition is favorable for promoting components such as silicon, aluminum and the like between the infiltrated sulfate ions and hydration products to react to generate inert chemical substances (calcium sulphoaluminate), so that the activity of sulfate corrosion is weakened, and the durability of the concrete is improved;
3) the modified high-sulfur-resistant corrosion agent is doped into the cement-based material, the mechanical property of the cement-based material can be macroscopically regulated and controlled by utilizing the advantage of the enhancement of the sulfur-resistant corrosion agent, and meanwhile, the compactness of the cement-based material can be microscopically improved by utilizing the advantage of the participation of the sulfur-resistant corrosion agent in a chemical reaction to generate an inert substance.
Drawings
FIG. 1 is a graph showing the results of the mineral phase of the hydration product of the modified high sulfur corrosion inhibitor of example 1 incorporated into a concrete test block;
FIG. 2 shows the results of the mineral phase of the hydration product of the sulphur corrosion resistant component incorporated in the concrete test block obtained in step 1 of example 1;
FIG. 3 shows the results of the hydration product mineral phase of the sulfur corrosion inhibitor incorporated into a concrete test block obtained in comparative example 1;
FIG. 4 is a microscopic image of the hydration product of the concrete test block with the modified high sulfur corrosion inhibitor of example 1;
FIG. 5 is a microscopic image of the hydration product of the concrete test block with the sulfur corrosion inhibitor incorporated therein obtained in step 1 of example 1;
FIG. 6 is a microscopic image of the hydration product of the concrete test block incorporating the sulfur corrosion inhibitor obtained in example 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the following examples, aqueous Ketai solutions were used which were supplied by foreign CEMENTAID, where the Ketai solution had an effective solids content of 25%.
In the following examples, a solution of 0.03 to 0.08mol/L of an auxiliary agent in vinyl bis-stearamide is used
Example 1
The preparation method of the modified high-sulfur-resistance corrosion agent comprises the following steps:
1) adding 800mL of 3mol/L sodium benzoate aqueous solution, 40mL of 2mol/L sodium citrate solution and 1000mL of 0.035mol/L n-octyltriethoxysilane aqueous solution into a three-neck flask; introducing nitrogen for protection, heating to 45 ℃ in a DF-1 heat collection type magnetic heating stirrer, swelling for 15min, rapidly heating to 60 ℃, adding 160mL of 0.08mol/L auxiliary agent vinyl bis stearamide, reacting for 15min, and cooling to room temperature to obtain the sulfur corrosion inhibitor;
2) mixing 850ml of the obtained sulfur-resistant corrosion agent with 120ml of Cleox aqueous solution, carrying out ultrasonic oscillation for 30min to uniformly mix and disperse the sulfur-resistant corrosion agent and the Cleox aqueous solution, then adding 30ml of 1 wt% lithium hydroxide solution, stirring at the constant temperature of 45 ℃ for 30min, and cooling to room temperature to obtain the modified high-sulfur-resistant corrosion agent.
Example 2
The preparation method of the modified high-sulfur-resistance corrosion agent comprises the following steps:
1) adding 800mL of 3mol/L sodium benzoate aqueous solution, 60mL of 2mol/L sodium citrate aqueous solution and 1000mL of 0.035mol/L n-octyltriethoxysilane aqueous solution into a three-neck flask, introducing nitrogen for protection, heating to 50 ℃ in a DF-1 heat collection type magnetic heating stirrer, swelling for 30min, rapidly heating to 60 ℃, adding 140mL of 0.04mol/L auxiliary agent vinyl distearamide, reacting for 20min, and cooling to room temperature to obtain the sulfur corrosion inhibitor;
2) mixing 850ml of the obtained sulfur-resistant corrosion agent with 120ml of Cleox aqueous solution, carrying out ultrasonic oscillation for 30min to uniformly mix and disperse the sulfur-resistant corrosion agent and the Cleox aqueous solution, then adding 30ml of 1 wt% lithium hydroxide solution, stirring at the constant temperature of 45 ℃ for 30min, and cooling to room temperature to obtain the modified high-sulfur-resistant corrosion agent.
Example 3
The preparation method of the modified high-sulfur-resistance corrosion agent comprises the following steps:
1) adding 800mL of 3mol/L sodium benzoate aqueous solution, 60mL of 2mol/L sodium citrate solution and 960mL of 0.035mol/L n-octyltriethoxysilane aqueous solution into a three-neck flask, introducing nitrogen for protection, heating to 50 ℃ in a DF-1 heat collection type magnetic heating stirrer, swelling for 60min, rapidly heating to 60 ℃, adding 180mL of 0.06mol/L auxiliary agent vinyl distearamide, reacting for 50min, and cooling to room temperature to obtain the sulfur corrosion inhibitor;
2) mixing 850ml of the obtained sulfur-resistant corrosion agent with 120ml of Cleox aqueous solution, carrying out ultrasonic oscillation for 30min to uniformly mix and disperse the sulfur-resistant corrosion agent and the Cleox aqueous solution, then adding 30ml of 1 wt% lithium hydroxide solution, stirring at the constant temperature of 45 ℃ for 30min, and cooling to room temperature to obtain the modified high-sulfur-resistant corrosion agent.
Example 4
The preparation method of the modified high-sulfur-resistance corrosion agent comprises the following steps:
1) adding 780mL of 3mol/L sodium benzoate aqueous solution, 60mL of 2mol/L sodium citrate aqueous solution and 1000mL of 0.035mol/L n-octyltriethoxysilane aqueous solution into a three-neck flask, introducing nitrogen for protection, heating to 50 ℃ in a DF-1 heat collection type magnetic heating stirrer, swelling for 45min, rapidly heating to 60 ℃, adding 160mL of 0.08mol/L auxiliary agent vinyl distearamide, reacting for 45min, and cooling to room temperature to obtain the sulfur corrosion inhibitor;
2) mixing 850ml of the obtained sulfur-resistant corrosion agent with 120ml of Cleox aqueous solution, carrying out ultrasonic oscillation for 30min to uniformly mix and disperse the sulfur-resistant corrosion agent and the Cleox aqueous solution, then adding 30ml of 1 wt% lithium hydroxide solution, stirring at the constant temperature of 45 ℃ for 30min, and cooling to room temperature to obtain the modified high-sulfur-resistant corrosion agent.
Example 5
The preparation method of the modified high-sulfur-resistance corrosion agent comprises the following steps:
1) adding 760mL of 3mol/L sodium benzoate aqueous solution, 60mL of 2mol/L sodium citrate aqueous solution and 1000mL of 0.035mol/L n-octyltriethoxysilane aqueous solution into a three-neck flask, introducing nitrogen for protection, heating to 50 ℃ in a DF-1 heat collection type magnetic heating stirrer, swelling for 45min, rapidly heating to 60 ℃, adding 180mL of 0.06mol/L auxiliary agent vinyl distearamide, reacting for 45min, and cooling to room temperature to obtain the sulfur corrosion inhibitor;
2) mixing 850ml of the obtained sulfur-resistant corrosion agent with 120ml of Cleox aqueous solution, carrying out ultrasonic oscillation for 30min to uniformly mix and disperse the sulfur-resistant corrosion agent and the Cleox aqueous solution, then adding 30ml of 1 wt% lithium hydroxide solution, stirring at the constant temperature of 45 ℃ for 30min, and cooling to room temperature to obtain the modified high-sulfur-resistant corrosion agent.
Comparative example 1
The preparation method of the sulfur corrosion inhibitor comprises the following steps:
adding 760mL of 3mol/L sodium benzoate aqueous solution and 60mL of 2mol/L sodium citrate solution into a three-neck flask, introducing nitrogen for protection, heating to 50 ℃ in a DF-1 heat collection type magnetic heating stirrer, swelling for 60min, rapidly heating to 60 ℃, adding 180mL of 0.08mol/L auxiliary agent vinyl bis-stearamide, reacting for 45min, and cooling to room temperature to obtain the sulfur corrosion inhibitor.
Comparative example 2
The preparation method of the sulfur corrosion inhibitor comprises the following steps:
mixing 850ml of the obtained sulfur-resistant corrosion agent with 120ml of Cleox aqueous solution, carrying out ultrasonic oscillation for 30min to uniformly mix and disperse the sulfur-resistant corrosion agent and the Cleox aqueous solution, then adding 30ml of 1 wt% lithium hydroxide solution, stirring at the constant temperature of 60 ℃ for 30min, and cooling to room temperature to obtain the high sulfur-resistant corrosion agent.
Application example 1
The modified high sulfur corrosion inhibitor obtained in the embodiment 1-5 and the sulfur corrosion inhibitor obtained in the comparative example 1-2 are mixed into concrete, and the concrete is subjected to corrosion cycle for 150 times, and then performance tests such as compressive strength, water absorption, chloride ion diffusion coefficient, 14d carbonization depth and the like are respectively carried out, and the results are shown in table 1.
Wherein the concrete comprises the following components in parts by weight: 7% of cement, 6% of fly ash, 3% of mineral powder, 2% of tuff powder, 30% of sand, 43% of pebbles and 6% of water; 3% of modified sulfur corrosion inhibitor; 0.04 percent of ZJ-2005 type high-performance water reducing agent is added, wherein the solid content is 18 percent.
TABLE 1 results of performance test of concrete after 150 cycles of corrosion by the sulfur corrosion inhibitor described in examples 1 to 5 and comparative examples 1 to 2
| Group of | Compressive strength/MPa | Water absorption/%) | Diffusion coefficient of chloride ion/10-10cm2/s | 14d carbonization depth/mm |
| Example 1 | 53.4 | 3.36 | 286 | 3.2 |
| Example 2 | 52.6 | 2.67 | 263 | 2.8 |
| Example 3 | 52.9 | 2.56 | 257 | 2.4 |
| Example 4 | 51.7 | 3.32 | 283 | 3.2 |
| Example 5 | 52.4 | 2.97 | 264 | 2.6 |
| Comparative example 1 | 36.7 | 4.86 | 336 | 4.3 |
| Comparative example 2 | 38.5 | 4.52 | 354 | 4.6 |
As can be seen from Table 1, it can be seen from Table 1 that the concrete prepared by using the modified sulfur corrosion inhibitor described in examples 1-5 has excellent compressive strength and durability, the performance difference between the examples is not great, and the compressive strength and durability of the concrete prepared in comparative example 1 and comparative example 2 are poor.
Wherein the compressive strength of the concrete prepared by doping the modified sulfur corrosion inhibitor in the embodiment 3 after 150 times of corrosion cycle is 52.9MPa, the water absorption rate is 2.56 percent, and the chloride ion diffusion coefficient is 257 multiplied by 10-10cm2And the 14d carbonization depth is 2.4mm, compared with the concrete prepared in the comparative example 1, the compressive strength is higher by 44.1 percent, the water absorption is reduced by 47.3 percent, the chloride ion diffusion coefficient is reduced by 23.5 percent, and the carbonization depth is reduced by 44.2 percent. The modified high-resistance material obtained by the inventionThe sulfur corrosive can participate in hydration reaction, improve the compactness of concrete, and promote the stable development of strength and the like.
Application example 2
The modified high-sulfur-resistance corrosion inhibitor obtained in example 1, the sulfur-resistance corrosion component obtained in step 1) of example 1 and the common sulfur-resistance corrosion inhibitor prepared in comparative example 1 are mixed into concrete according to the method described in application example 1, and the composition and microscopic results of hydration products of the concrete are analyzed after 150 times of sulfate dry-wet cycle corrosion respectively, and the results are respectively shown in fig. 1-6 and table 2.
As can be seen from comparison of the graphs in FIGS. 1 to 3, after 150 times of sulfate dry-wet cycle corrosion, the concrete prepared by adding the modified high-sulfur-resistance corrosion inhibitor in the sulfate corrosion environment can obviously detect CaSO4The existence of the sulfate indicates that the cement concrete structure is damaged by sulfate to a certain degree; but due to Ca (OH) in the cement paste2The content is also larger, which indicates that the concrete prepared by adding the modified high-sulfur corrosion inhibitor described in the example 1 suffers from less sulfate attack damage, and Ca (OH)2The existence of (1) proves that the pH value inside the net slurry does not change greatly along with the increase of the corrosion age, and other destructive products such as AFt and the like are not generated inside the structure in the 150 times of sulfate corrosion age, so that the sulfur corrosion resistant component has good sulfur corrosion resistant effect (the sulfur corrosion resistant component obtained in the step 1 generates other destructive products such as AFt and the like).
As can be seen from FIG. 3, the concrete prepared by adding the anti-sulfur corrosion agent described in comparative example 1 has the composition in the set cement reacted with aggressive media such as sulfate radical deep into the structure after 150 times of sulfate wet-dry cycle corrosion, and generates CaSO with expansibility4And ettringite. CaSO4And ettringite are produced in two environments with different pH values and sulfate concentration values, since cement concrete test blocks are sulfate corroded in a sulfate wet and dry cycle apparatus, in which a large amount of water is evaporated with each wet and dry cycle, Ca (OH)2The pH value and the sulfate concentration of the solution are inevitably changed due to continuous reaction and dissolution of the substances, and two destructive products exist simultaneously along with the increase of the corrosion age.
FIG. 4 shows that after 150 times of sulfate corrosion, the concrete prepared by adding the modified sulfur corrosion inhibitor described in example 1 has more pores and cracks inside the concrete structure, no obvious ettringite is generated, but a part of CaSO is generated4And (4) crystals. FIG. 5 shows that the concrete prepared by adding the sulfur corrosion resistant component described in step 1 of example 1 has no obvious reaction product of sulfate inside, and has a few sulfate crystals and small-sized pores and microcracks, which indicates that the concrete has a certain sulfate attack damage in the corrosion stage. FIG. 6 shows that the concrete prepared by the sulfur corrosion inhibitor described in comparative example 1 generates fibrous AFt after being subjected to sulfate attack, and obvious cracks and pores appear in the concrete, which indicates that ettringite is superposed for a long time, is accumulated in the concrete and causes the damage of the concrete structure. The SEM test result of each group of concrete after 150 times of sulfate dry-wet cycle corrosion is basically consistent with the XRD test result. The modified high sulfate erosion resistance agent is proved to improve the sulfate erosion resistance of concrete.
Table 2 shows the pore structure analysis of the modified high sulfur corrosion inhibitor obtained in example 1, the sulfur corrosion inhibitor obtained in step 1) in example 1 and the conventional sulfur corrosion inhibitor prepared in comparative example 1 after hydration products are incorporated into concrete by the method described in application example 2 and subjected to 150 sulfate wet and dry cycle corrosion, and the results show that: the modified high-sulfur-resistance corrosion inhibitor obtained in the embodiment 1 has low porosity of concrete, more gel pores (less than 10nm) and transition pores (10-100 nm), fewer capillary pores (100-1000 nm), macropores (more than 1000nm) and high density, and shows that the modified high-sulfur-resistance corrosion inhibitor has better sulfuric acid corrosion resistance to the concrete; compared with the comparative example 1, the high-sulfur-corrosion-resistance component obtained in the step 1 in the embodiment 1 has the advantages that the porosity of concrete is reduced, gel pores (less than 10nm) and transition pores (10-100 nm) are increased, capillary pores (100-1000 nm) and macropores (more than 1000nm) are reduced, and the compactness is improved, so that the sodium benzoate and silicone oil hydrophobic materials introduced into the sulfur corrosion resistance agent are closely adsorbed with each other, the macropores in the concrete are favorably filled and reduced, the pore diameter is reduced, small pores with stable sizes are formed, the stress effect caused by salt crystals or ice crystals can be relieved, the salt crystals and the freeze-thaw resistance of the concrete are improved, and meanwhile, the permeability of an erosion solution is reduced under the action pressure of a capillary tube, and the erosion resistance of sulfate is improved.
TABLE 2 pore size distribution characteristics of concrete hydrates
The above embodiments are merely examples for clearly illustrating the present invention and do not limit the present invention. Other variants and modifications of the invention, which are obvious to those skilled in the art and can be made on the basis of the above description, are not necessary or exhaustive for all embodiments, and are therefore within the scope of the invention.
Claims (10)
1. The preparation method of the modified high-sulfur-resistance corrosion agent is characterized by comprising the following steps of:
1) uniformly dispersing sodium citrate, sodium benzoate and a silicone oil hydrophobic material in water, and heating and swelling under a protective atmosphere; then heating to 55-60 ℃, adding vinyl bis stearamide, and carrying out heat preservation treatment on the obtained mixed solution to obtain a sulfur corrosion resistant component;
2) and mixing the obtained sulfur corrosion resistant component with the Cleox aqueous solution, adding a lithium hydroxide solution, and stirring at 45-60 ℃ to obtain the modified high sulfur corrosion resistant agent.
2. The method as claimed in claim 1, wherein the silicone oil hydrophobic material is n-octyltriethoxysilane.
3. The method as claimed in claim 1, wherein the molar ratio of the sodium citrate, the sodium benzoate, the silicone oil hydrophobic material and the vinyl bis-stearamide is (0.6-1.4): 22-26): 0.3-0.4): 0.1-0.2.
4. The preparation method according to claim 1, wherein the concentration of sodium citrate introduced into the obtained sulfur corrosion resistant component is 0.04-2 mol/L.
5. The method of claim 1, wherein the protective atmosphere is nitrogen, argon, or helium.
6. The method according to claim 1, wherein the swelling temperature is 45 to 50 ℃ for 15 to 60 min.
7. The preparation method according to claim 1, wherein the heat-preserving treatment time in the step 1) is 15-50 min.
8. The preparation method of claim 1, wherein the Cleox aqueous solution has a solid content of 20-40%; the concentration of the lithium hydroxide solution is 0.5 to 3 wt%.
9. The preparation method of claim 1, wherein the volume ratio of the sulfur corrosion resistant component to the Cleox aqueous solution to the lithium hydroxide solution is 80-90: 6-20: 2-4.
10. The modified high-sulfur corrosion inhibitor prepared by the preparation method of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111086272.4A CN113698131A (en) | 2021-09-16 | 2021-09-16 | Modified high-sulfur-resistance corrosion agent and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111086272.4A CN113698131A (en) | 2021-09-16 | 2021-09-16 | Modified high-sulfur-resistance corrosion agent and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113698131A true CN113698131A (en) | 2021-11-26 |
Family
ID=78661133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111086272.4A Withdrawn CN113698131A (en) | 2021-09-16 | 2021-09-16 | Modified high-sulfur-resistance corrosion agent and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113698131A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1982964A1 (en) * | 2007-04-20 | 2008-10-22 | Evonik Degussa GmbH | Preparation containing organosilicium compound and its use |
| CN101792279A (en) * | 2010-02-08 | 2010-08-04 | 徐运海 | Formula and preparation process of concrete sulfate resistance agent |
| CN103332890A (en) * | 2013-05-30 | 2013-10-02 | 上海大禺预制构件有限公司 | Corrosion-resistant hollow square pile concrete |
| CN103962072A (en) * | 2014-04-28 | 2014-08-06 | 深圳大学 | Chemical trigger microcapsule and preparation method thereof |
| CN106747088A (en) * | 2016-12-13 | 2017-05-31 | 武汉理工大学 | A kind of anti-corrosion extra large work mass concrete of low-temperature-rise and preparation method thereof |
| CN107324681A (en) * | 2017-06-30 | 2017-11-07 | 中建西部建设西南有限公司 | A kind of thaumasite type sulphate corrosion inhibitor and preparation method |
| CN110668749A (en) * | 2019-09-25 | 2020-01-10 | 中建西部建设北方有限公司 | Sulfate corrosion resistant concrete |
| CN110922125A (en) * | 2019-11-18 | 2020-03-27 | 北京太平洋水泥制品有限公司 | Sulfate erosion resistant concrete and preparation method thereof |
| CN112851195A (en) * | 2021-03-16 | 2021-05-28 | 河南理工大学 | Additive for inhibiting stray current corrosion of reinforced concrete and method thereof |
-
2021
- 2021-09-16 CN CN202111086272.4A patent/CN113698131A/en not_active Withdrawn
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1982964A1 (en) * | 2007-04-20 | 2008-10-22 | Evonik Degussa GmbH | Preparation containing organosilicium compound and its use |
| CN101792279A (en) * | 2010-02-08 | 2010-08-04 | 徐运海 | Formula and preparation process of concrete sulfate resistance agent |
| CN103332890A (en) * | 2013-05-30 | 2013-10-02 | 上海大禺预制构件有限公司 | Corrosion-resistant hollow square pile concrete |
| CN103962072A (en) * | 2014-04-28 | 2014-08-06 | 深圳大学 | Chemical trigger microcapsule and preparation method thereof |
| CN106747088A (en) * | 2016-12-13 | 2017-05-31 | 武汉理工大学 | A kind of anti-corrosion extra large work mass concrete of low-temperature-rise and preparation method thereof |
| CN107324681A (en) * | 2017-06-30 | 2017-11-07 | 中建西部建设西南有限公司 | A kind of thaumasite type sulphate corrosion inhibitor and preparation method |
| CN110668749A (en) * | 2019-09-25 | 2020-01-10 | 中建西部建设北方有限公司 | Sulfate corrosion resistant concrete |
| CN110922125A (en) * | 2019-11-18 | 2020-03-27 | 北京太平洋水泥制品有限公司 | Sulfate erosion resistant concrete and preparation method thereof |
| CN112851195A (en) * | 2021-03-16 | 2021-05-28 | 河南理工大学 | Additive for inhibiting stray current corrosion of reinforced concrete and method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 刘建英: ""新型抗高浓硫酸盐腐蚀剂及其混凝土性能研究"", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
| 张宿峰: "《建筑材料》", 31 August 2017, 电子科技大学出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1078897B1 (en) | Early enhanced strength cement composition | |
| AU2017248016A1 (en) | Geopolymer foam formulation | |
| CN112194396B (en) | Slow-release hydrophobing agent for cement-based material, hydrophobic cement and preparation method thereof | |
| Maruyama et al. | Action mechanisms of shrinkage reducing admixture in hardened cement paste | |
| CN114656237B (en) | Titanium gypsum-based roadbed filler and preparation method and application thereof | |
| CN113955994B (en) | Preparation method of chloride ion corrosion resistant recycled coarse aggregate concrete | |
| CN112592087B (en) | Admixture and preparation method and application thereof | |
| CN115321885A (en) | Polymer modified cement-based repair mortar for marine concrete and preparation method thereof | |
| CN115043624B (en) | Corrosion-resistant mass concrete and preparation method thereof | |
| CN115286278A (en) | Composite additive for fly ash-based concrete and preparation method and application thereof | |
| CN111960719B (en) | Lightweight aggregate concrete and preparation method thereof | |
| CN110922114B (en) | Method for preparing porous cement-based material by using activated carbon material | |
| CN112624662A (en) | High-dispersion organic-inorganic composite powder water repellent and preparation method thereof | |
| CN113698131A (en) | Modified high-sulfur-resistance corrosion agent and preparation method thereof | |
| CN115504726B (en) | Preparation method of slow-release hydrophobic microcapsule and hydrophobic concrete | |
| CN114772976B (en) | Anti-freezing anti-cracking concrete waterproofing agent and preparation method thereof | |
| CN116375425A (en) | Marine concrete with high corrosion resistance and preparation method thereof | |
| CN112624688B (en) | Low-wetting and high-durability composite portland cement and preparation method thereof | |
| CN108975791A (en) | A kind of regenerative air entrained concrete and preparation method thereof that anti-freezing property is excellent | |
| CN115536307A (en) | Admixture for high-impermeability marine concrete and preparation method thereof | |
| CN110922146A (en) | Aerated concrete block and preparation method thereof | |
| CN112830759B (en) | Preparation method of pore-hydrophobic magnesium oxychloride cement system suitable for oil well cementing | |
| Bajja et al. | Influence of silica fume and water content on the microstructure and diffusion parameters of cement pastes | |
| EP4269370A1 (en) | Process for the production of alkali-activated materials (aams), products obtainable with said process and heat insulating materials comprising said aam products | |
| RU2759255C2 (en) | Composition and method for manufacturing heat-insulating concrete |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20211126 |