CN115893894A - Chloride ion curing agent for sea sand concrete and preparation method thereof - Google Patents
Chloride ion curing agent for sea sand concrete and preparation method thereof Download PDFInfo
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- CN115893894A CN115893894A CN202211353878.4A CN202211353878A CN115893894A CN 115893894 A CN115893894 A CN 115893894A CN 202211353878 A CN202211353878 A CN 202211353878A CN 115893894 A CN115893894 A CN 115893894A
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- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 title claims abstract description 81
- 239000004567 concrete Substances 0.000 title claims abstract description 48
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 47
- 239000004576 sand Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title abstract description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 51
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims abstract description 32
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 28
- 239000011575 calcium Substances 0.000 claims abstract description 28
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000002994 raw material Substances 0.000 claims abstract description 26
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 19
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 17
- 230000000694 effects Effects 0.000 claims abstract description 12
- 238000003756 stirring Methods 0.000 claims description 15
- 238000007873 sieving Methods 0.000 claims description 12
- 238000000227 grinding Methods 0.000 claims description 11
- 239000000126 substance Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 7
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 238000001354 calcination Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 5
- 239000000654 additive Substances 0.000 claims description 4
- 230000000996 additive effect Effects 0.000 claims description 2
- 238000003795 desorption Methods 0.000 abstract description 2
- 230000003993 interaction Effects 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 239000002131 composite material Substances 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 235000012239 silicon dioxide Nutrition 0.000 description 5
- 150000001450 anions Chemical class 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 230000036571 hydration Effects 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 239000002135 nanosheet Substances 0.000 description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- 239000003957 anion exchange resin Substances 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 2
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 2
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000010220 ion permeability Effects 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
- 239000010410 layer Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 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
- 238000002156 mixing Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a chloride ion curing agent for sea sand concrete and a preparation method and application thereof, wherein the chloride ion curing agent comprises the following raw materials in parts by weight: 200-300 parts of metakaolin and calcium sulphoaluminate modified CaAl-NO 3 50-100 parts of LDHs, 60-80 parts of superfine silica fume, 30-50 parts of calcium sulfate and 5-20 parts of polyaluminium sulfate. Through the interaction of the raw materials, the sea sand concrete chloride ion curing agent has an excellent chloride ion fixing effect and can be fixed for a long time without desorption; can be widely applied to marine environment.
Description
Technical Field
The invention belongs to the technical field of concrete additives, and particularly relates to a chloride ion curing agent for sea sand concrete and a preparation method thereof.
Background
The concrete composite material is a building material with the widest application range in the modern society, and no matter infrastructure, traffic tracks, urban development, hydraulic engineering, highway bridges and the like can not be used, however, in the regions which are built in open sea or lack natural river sand and machine-made sand in coastal areas, the engineering construction needs to be transported from other places, and the engineering construction cost is greatly increased. However, a large amount of sea sand resources often exist in open sea or coastal areas, and the sea sand cannot be used for preparing reinforced concrete due to high chloride ion content, so that local materials can be obtained only by curing chloride ions in the sea sand through a chloride ion curing agent. In addition, marine engineering is also damaged by external corrosive ions, especially chloride ions penetrate and are damaged more rapidly under the coupling action of external environments (such as temperature, pH and the like). If the special chloride ion curing agent can be used for effectively curing the chloride ions permeated inside and outside, the sea sand is used for the construction of ocean engineering, the construction cost of the ocean engineering can be obviously reduced, and the service life of the concrete structure can be obviously prolonged by inhibiting the corrosion of the chloride ions.
Under the harsh environment of ocean, chloride ion erosion is a main factor causing the deterioration of a concrete structure, chloride ions can permeate into a cement matrix to reduce the pH value of a solution, so that the alkalinity in the concrete structure is reduced, a protective layer on the surface of a steel bar is damaged, the steel bar is corroded and burst, and the concrete is peeled and damaged. The steel bar can be rusted only when free chloride ions reach the surface of the steel bar to damage the rust-resistant layer. The addition of additives with curing chloride ions to concrete composites is an effective way and there is also a great deal of related research in the prior art.
Chinese patent CN 110803718A discloses a chloride ion curing agent applied to sea sand, which comprises the following raw materials: caFe-NO 3 LDHs nanosheet and CaFeAl-NO 3 LDHs nanosheet, alkaline anion exchange resin and polyvinylpyrrolidone, wherein the component is CaFe-NO 3 LDHs nanosheet and CaFeAl-NO 3 The LDHs nanosheet is a metal double hydroxide with a layered structure; the compound proportion of the components is as follows according to the parts by weight: caFe-NO 3 20-40 parts of LDHs (layered double hydroxides), caFeAl-NO 3 20-40 parts of LDHs, 20-30 parts of alkaline anion exchange resin and 5-10 parts of polyvinylpyrrolidone. Chinese patent CN 109824288A discloses a cement-based chlorine-fixing agent, which has the solid content of 30-60 percent and comprises the following raw materials in parts by mass: 100 parts of nano aluminum sol, 5-20 parts of kaolin flakes, 10-45 parts of aluminum oxide and 10-30 parts of aluminum hydroxide.
However, there is still room for improvement in the effect of chloride ion curing, which is also the focus and difficulty of the existing research.
Disclosure of Invention
Aiming at the requirements of the prior art, the invention provides a chloride ion curing agent for sea sand concrete and a preparation method thereof, which can effectively cure chloride ions in a concrete structure and can realize long-term stability.
In order to achieve the purpose, the invention adopts the following technical scheme:
a chloride ion curing agent for sea sand concrete comprises the following raw materials in parts by weight:
200-300 parts of metakaolin;
calcium sulphoaluminate modified CaAl-NO 3 50-100 parts of LDHs;
60-80 parts of superfine silica fume;
30-50 parts of calcium sulfate;
5-20 parts of polyaluminium sulfate.
Further, the chloride ion curing agent for the sea sand concrete comprises the following raw materials in parts by weight:
240-260 parts of metakaolin;
calcium sulphoaluminate modified CaAl-NO 3 70-80 parts of LDHs;
65-75 parts of superfine silica fume;
35-45 parts of calcium sulfate;
10-15 parts of polyaluminium sulfate.
Further, the metakaolin has a size of 20 to 50 μm.
Furthermore, the content of silicon dioxide in the superfine silicon ash is more than 96 percent, the activity index is more than 120 percent, and the specific surface area is 16000-20000 m 2 /kg。
Further, calcium sulphoaluminate modified CaAl-NO 3 LDHs are obtained by the following method: (1) 100 parts by weight of CaAl-NO 3 Dissolving LDHs in 300-400 parts of water, and stirring to dissolve the LDHs; (2) Adding 10-20 parts of calcium sulphoaluminate and 0.5-1 part of maleic anhydride into the solution, continuously stirring uniformly, standing, filtering and drying; (3) And placing the filtered substance into a muffle furnace at the temperature of 300-350 ℃ for calcining for 2-3 h, cooling along with the furnace, and grinding and crushing the substance to 400-800 meshes.
A preparation method of a chloride ion curing agent for sea sand concrete comprises the following steps:
(1) Weighing the raw materials according to the raw material proportion;
(2) Modifying metakaolin and calcium sulphoaluminate to CaAl-NO 3 Pouring LDHs, superfine silica fume, calcium sulfate and polyaluminum sulfate into a stirrer for stirring and grinding;
(3) Sieving with 200-300 mesh sieve, and returning unqualified part to step (2); and repeating the sieving step for multiple times to finally obtain the chloride ion curing agent.
The application of the chloride ion curing agent for the sea sand concrete is to mix the chloride ion curing agent as an additive into sea sand aggregate, wherein the addition amount of the chloride ion curing agent is 2-5% of the mass of the sea sand aggregate.
Compared with the prior art, the chloride ion curing agent for the sea sand concrete has the following beneficial effects:
(1) The metakaolin is a substance for fixing chloride ions, and has the characteristic of low cost, so that the metakaolin is used as a main raw material of the chloride ion curing agent, and the application cost can be effectively reduced; has good economic value for building construction. Studies have shown that the size of metakaolin has a large influence on the immobilization capacity of chloride ions, and for this reason, it is appropriate for the applicant to optimize the metakaolin to have a size of 20 to 50 μm.
(2)CaAl-NO 3 LDHs also have good fixing ability for chloride ions, but in contrast, the fixing ability for carbonate ions and sulfate ions is higher than that for chloride ions; while various anions are fixed, carbonate ions and sulfate ions are preferentially fixed, so that the fixation saturation is easily achieved in advance, and partial chloride ions are still in a free state. However, the corrosion of the steel reinforcement by chloride ions is the most dominant. Thus, the Applicant has led to the reaction of CaAl-NO by calcium sulphoaluminate 3 LDHs modification to make CaAl-NO 3 The ability of LDHs to fix chloride ions is preferred to anions such as carbonate ions and sulfate ions. The calcium sulphoaluminate can react with chloride ions to generate 3CaO & Al 2 O 3 ·CaCl 2 ·10H 2 O, is a good chloride ion fixing agent. By modifying calcium sulphoaluminate in CaAl-NO 3 LDHs to finally make the chloride ions stably fixed on the calcium sulphoaluminate modified CaAl-NO for a long time 3 LDHs.
(3) The superfine silica fume can improve the microstructure in the concrete and the composition of hydration products; avoid the concentration of chloride ions, sulfate ions and the like and hydration products of cement on the interface of the coarse aggregate, and react to generate low-alkalinity hydration and C-S-H gel with good stability and high strength. On the other hand, the concrete structure and the interface structure are more compact due to the stacking and compacting effect of the ultrafine powder, so that water and anions are difficult to enter the concrete, and the diffusion of chloride ions to the surface of the steel bar is hindered.
(4) Calcium ions are dissociated from calcium sulfate after concrete is mixed, the calcium ions can be adsorbed on the surface of the C-S-H gel, zeta potential of the C-S-H gel can be improved, electrostatic attraction to anions is further enhanced, the capacity of fixing chloride ions is achieved in the concrete hydration process, and the fixing amount of the chloride ions due to the large amount of formed C-S-H gel can be also remarkably improved.
(5) Through the interaction of the raw materials, the sea sand concrete chloride ion curing agent has an excellent chloride ion fixing effect and can be fixed for a long time without desorption.
Detailed Description
For better understanding of the present invention, the following examples are given for further illustration of the present invention, but the present invention is not limited to the following examples.
Example 1
A chloride ion curing agent for sea sand concrete comprises the following raw materials in parts by weight:
200 parts of metakaolin;
calcium sulphoaluminate modified CaAl-NO 3 50 parts of LDHs;
60 parts of superfine silica fume;
30 parts of calcium sulfate;
5 parts of polyaluminium sulfate.
Wherein the size of the metakaolin is 20-50 mu m.
Wherein, the content of silicon dioxide in the superfine silicon ash is more than 96 percent, the activity index is more than 120 percent, and the specific surface area is 16000-20000 m 2 /kg。
Wherein, calcium sulphoaluminate is modified CaAl-NO 3 LDHs are obtained by the following method: (1) 100 parts by weight of CaAl-NO 3 Dissolving LDHs in 300 parts of water, and stirring to dissolve the LDHs; (2) Adding 10 parts of calcium sulphoaluminate and 0.5 part of maleic anhydride into the solution, continuously stirring uniformly, standing, filtering and drying; (3) And putting the filtered substance into a muffle furnace at 300 ℃ for calcining for 2h, cooling along with the furnace, and grinding and crushing the substance to 400-800 meshes.
The preparation method of the chloride ion curing agent for the sea sand concrete comprises the following steps:
(1) Weighing the raw materials according to the raw material proportion;
(2) Modifying metakaolin and calcium sulphoaluminate to CaAl-NO 3 Pouring LDHs, superfine silica fume, calcium sulfate and polyaluminum sulfate into a stirrer for stirring and grinding;
(3) Sieving with a 200-mesh sieve, and returning the unqualified part to the step (2); and repeating the sieving step for multiple times to finally obtain the chloride ion curing agent.
Example 2
A chloride ion curing agent for sea sand concrete comprises the following raw materials in parts by weight:
300 parts of metakaolin;
calcium sulphoaluminate modified CaAl-NO 3 100 parts of LDHs;
80 parts of superfine silica fume;
50 parts of calcium sulfate;
20 parts of polyaluminum sulfate.
Wherein the size of the metakaolin is 20-50 mu m.
Wherein, the content of silicon dioxide in the superfine silicon ash is more than 96 percent, the activity index is more than 120 percent, and the specific surface area is 16000-20000 m 2 /kg。
Wherein, calcium sulphoaluminate is modified CaAl-NO 3 LDHs are obtained by the following method: (1) 100 parts by weight of CaAl-NO 3 The LDHs were dissolved in 300 parts of water, and stirred to dissolve; (2) Adding 10 parts of calcium sulphoaluminate and 0.5 part of maleic anhydride into the solution, continuously stirring uniformly, standing, filtering and drying; (3) And putting the filtered substance into a muffle furnace at 300 ℃ for calcining for 2h, cooling along with the furnace, and grinding and crushing the substance.
The preparation method of the chloride ion curing agent for the sea sand concrete comprises the following steps:
(1) Weighing the raw materials according to the raw material proportion;
(2) Modifying the metakaolin and the calcium sulphoaluminate to CaAl-NO 3 Pouring LDHs, superfine silica fume, calcium sulfate and polyaluminum sulfate into a stirrer for stirring and grinding;
(3) Sieving with a 300-mesh sieve, and returning the unqualified part to the step (2); and repeating the sieving step for multiple times to finally obtain the chloride ion curing agent.
Example 3
A chloride ion curing agent for sea sand concrete comprises the following raw materials in parts by weight:
250 parts of metakaolin;
calcium sulphoaluminate modified CaAl-NO 3 75 parts of LDHs;
70 parts of superfine silica fume;
40 parts of calcium sulfate;
13 parts of polyaluminum sulfate.
Wherein the size of the metakaolin is 20-50 μm.
Wherein, the content of silicon dioxide in the superfine silicon ash is more than 96 percent, the activity index is more than 120 percent, and the specific surface area is 16000-20000 m 2 /kg。
Wherein, calcium sulphoaluminate is modified CaAl-NO 3 LDHs are obtained by the following method: (1) 100 parts by weight of CaAl-NO 3 Dissolving LDHs in 300 parts of water, and stirring to dissolve the LDHs; (2) Adding 10 parts of calcium sulphoaluminate and 0.5 part of maleic anhydride into the solution, continuously stirring uniformly, standing, filtering and drying; (3) And putting the filtered substance into a muffle furnace at 300 ℃ for calcining for 2h, cooling along with the furnace, and grinding and crushing the substance.
The preparation method of the chloride ion curing agent for the sea sand concrete comprises the following steps:
(1) Weighing the raw materials according to the raw material proportion;
(2) Modifying metakaolin and calcium sulphoaluminate to CaAl-NO 3 Pouring LDHs, superfine silica fume, calcium sulfate and polyaluminum sulfate into a stirrer for stirring and grinding;
(3) Sieving with a 250-mesh sieve, and returning the unqualified part to the step (2); and repeating the sieving step for multiple times to finally obtain the chloride ion curing agent.
Comparative example 1
A chloride ion curing agent for sea sand concrete comprises the following raw materials in parts by weight:
250 parts of metakaolin;
CaAl-NO 3 75 parts of LDHs;
70 parts of superfine silica fume;
40 parts of calcium sulfate;
13 parts of polyaluminium sulfate.
Wherein the size of the metakaolin is 20-50 μm.
Wherein, the content of silicon dioxide in the superfine silicon ash is more than 96 percent, the activity index is more than 120 percent, and the specific surface area is 16000-20000 m 2 /kg。
The preparation method of the chloride ion curing agent for the sea sand concrete comprises the following steps:
(1) Weighing the raw materials according to the raw material proportion;
(2) Mixing metakaolin and CaAl-NO 3 Pouring LDHs, superfine silica fume, calcium sulfate and polyaluminium sulfate into a stirrer for stirring and grinding;
(3) Sieving with a 200-mesh sieve, and returning the unqualified part to the step (2); and repeating the sieving step for multiple times to finally obtain the chloride ion curing agent.
The chloride ion curing agents of examples 1 to 3 and comparative example 1 were added as admixtures to concrete composites, and the curing rate, coulombic capacity, and chloride ion migration rate of the concrete composites were measured according to standard SL352-2006 "test procedures for Hydraulic concrete," technical Specifications for Corrosion protection of concrete structures in harbor engineering ", and the aggregate mix ratios of the concrete composites are as shown in Table 1.
TABLE 1
Table 2 records the test data of the chloride ion curing rate, coulomb capacity, and chloride ion mobility, which are as follows:
TABLE 2
As can be seen from the data in table 2: the sea sand concrete chloride ion curing agent prepared in examples 1-3 is added, so that the sea sand concrete chloride ion curing agent has excellent chloride ion curing efficiency and low coulombic electricity and chloride ion migration coefficient, and the chloride ion permeability resistance grade in a concrete structure is high, and the migration of chloride ions is hindered. By contrast, by using CaAl-NO 3 In the case of LDHs, the obtained chlorine ion curing agent also had good chlorine ion curing ability, but the effect was not as good as in examples 1 to 3. Thus, calcium sulphoaluminate modified CaAl-NO 3 Compared with LDHs, the LDHs can effectively improve the fixation effect of chloride ions.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A chloride ion curing agent for sea sand concrete is characterized by comprising the following raw materials in parts by weight:
200-300 parts of metakaolin;
calcium sulphoaluminate modified CaAl-NO 3 50-100 parts of LDHs;
60-80 parts of superfine silica fume;
30-50 parts of calcium sulfate;
5-20 parts of polyaluminium sulfate.
2. The chloride ion curing agent for sea sand concrete according to claim 1, which is characterized by comprising the following raw materials in parts by weight:
240-260 parts of metakaolin;
calcium sulphoaluminate modified CaAl-NO 3 70-80 parts of LDHs;
65-75 parts of superfine silica fume;
35-45 parts of calcium sulfate;
10-15 parts of polyaluminium sulfate.
3. The chloride ion curing agent for sea sand concrete according to claim 1, wherein the size of the metakaolin is 20 to 50 μm.
4. The curing agent for sea sand concrete chloride ions as claimed in claim 1, wherein the content of silica in the ultrafine silica fume is more than 96%, the activity index is more than 120%, and the specific surface area is 16000-20000 m 2 /kg。
5. The chloride ion curing agent for sea sand concrete as claimed in claim 1, wherein the calcium sulfoaluminate is modified CaAl-NO 3 LDHs are obtained by the following method: (1) 100 parts by weight of CaAl-NO 3 Dissolving LDHs in 300-400 parts of water, and stirring to dissolve the LDHs; (2) Adding 10-20 parts of calcium sulphoaluminate and 0.5-1 part of maleic anhydride into the solution, continuously stirring uniformly, standing, filtering and drying; (3) And placing the filtered substance into a muffle furnace at the temperature of 300-350 ℃ for calcining for 2-3 h, cooling along with the furnace, and grinding and crushing the substance to 400-800 meshes.
6. A method for preparing the chloride ion curing agent for sea sand concrete as claimed in claims 1-5, comprising the following steps:
(1) Weighing the raw materials according to the raw material ratio;
(2) Modifying the metakaolin and the calcium sulphoaluminate to CaAl-NO 3 Pouring LDHs, superfine silica fume, calcium sulfate and polyaluminium sulfate into a stirrer for stirring and grinding;
(3) Sieving with 200-300 mesh sieve, and returning unqualified part to step (2); and repeating the sieving step for multiple times to finally obtain the chloride ion curing agent.
7. The use of the chloride ion curing agent for sea sand concrete as claimed in claims 1 to 5, wherein the chloride ion curing agent is used as an additive to be mixed into the sea sand aggregate, and the addition amount is 2 to 5 percent of the mass of the sea sand aggregate.
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|---|---|---|---|
| CN202211353878.4A CN115893894B (en) | 2022-11-01 | Chloride ion curing agent for sea sand concrete and preparation method thereof |
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|---|---|---|---|
| CN202211353878.4A CN115893894B (en) | 2022-11-01 | Chloride ion curing agent for sea sand concrete and preparation method thereof |
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| CN115893894A true CN115893894A (en) | 2023-04-04 |
| CN115893894B CN115893894B (en) | 2024-07-09 |
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| CN109399986A (en) * | 2018-11-12 | 2019-03-01 | 武汉理工大学 | A kind of microcapsules support type chloride ion curing agent and its preparation method and application |
| CN112028531A (en) * | 2020-08-24 | 2020-12-04 | 潍坊纵横建材有限公司 | Concrete corrosion-proof rust-proof composite additive and preparation method thereof |
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108439899A (en) * | 2018-04-09 | 2018-08-24 | 中交第二航务工程局有限公司 | A kind of high intensity Ultralight cement-base composite material and preparation method thereof |
| CN109399986A (en) * | 2018-11-12 | 2019-03-01 | 武汉理工大学 | A kind of microcapsules support type chloride ion curing agent and its preparation method and application |
| CN112028531A (en) * | 2020-08-24 | 2020-12-04 | 潍坊纵横建材有限公司 | Concrete corrosion-proof rust-proof composite additive and preparation method thereof |
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