CN110563351A - Cement-based material for improving chloride ion binding rate and preparation method thereof - Google Patents
Cement-based material for improving chloride ion binding rate and preparation method thereof Download PDFInfo
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- CN110563351A CN110563351A CN201910980848.8A CN201910980848A CN110563351A CN 110563351 A CN110563351 A CN 110563351A CN 201910980848 A CN201910980848 A CN 201910980848A CN 110563351 A CN110563351 A CN 110563351A
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- cement
- based material
- binding rate
- chloride ion
- ion binding
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- 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
- C04B22/08—Acids or salts thereof
- C04B22/085—Acids or salts thereof containing nitrogen in the anion, e.g. nitrites
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- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/16—Sulfur-containing compounds
- C04B24/20—Sulfonated aromatic compounds
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- 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
- C04B7/00—Hydraulic cements
- C04B7/02—Portland cement
Abstract
the invention relates to a cement ~ based material for improving chloride ion binding rate, which comprises 8 ~ 10% of kaolin, 0.8 ~ 1.2% of naphthalene sulfonate water reducing agent and 1 ~ 3% of calcium nitrate based on the mass of portland cement3)2Dissolving in water, ultrasonic dispersing, mixing with ordinary silicate cement and kaolin, and shaping. The cement-based material prepared by the method can obviously improve the binding rate of chloride ions.
Description
Technical Field
The invention relates to a cement-based material, in particular to a cement-based material for improving the chloride ion binding rate and a preparation method thereof.
Background
since the advent of concrete technology, the problem of concrete durability has been difficult to effectively solve, and the service life is greatly reduced. The concrete material has large brittleness and poor tensile and bending resistance, and needs reinforcement by reinforcing bars, wherein the reinforcing bars are most widely used. The reinforced concrete structure combines the advantages of steel bars and concrete, and is the preferred form in the civil engineering structure design at present. Among them, corrosion of steel bars caused by chloride ions is the most important durability problem of reinforced concrete structures in marine environments or under the action of deicers. External chloride ions enter the interior of the concrete structure and reach the surface of the steel bar mainly through combined actions of diffusion and permeation, adsorption, capillary action, electrochemical migration and the like. When the content of chloride ions on the surface of the steel bar reaches a certain threshold value (critical concentration of chloride ions), the pH value can be rapidly reduced, the passivation film on the surface of the steel bar is damaged, the passivation phenomenon occurs, and the electrochemical corrosion effect is formed, so that the corrosion rate of the steel bar is greatly accelerated. After the reinforcing steel bars are corroded, on one hand, the effective cross-sectional area of the reinforcing steel bars can be reduced, so that the bearing capacity of a reinforced concrete structure is reduced, and the bond stress of the reinforcing steel bars is reduced; on the other hand, the volume of the steel bar is greatly expanded, and the extrusion causes the concrete to crack and peel from the inside, thereby causing the structural integrity to be damaged. The reinforced concrete structure is deteriorated due to corrosion of the steel bars caused by chloride ion corrosion every year, resulting in huge economic loss.
Disclosure of Invention
The invention aims to increase the binding rate of cement and chloride ions and reduce the corrosion of steel bars in a cement-based material, and provides the cement-based material with the improved binding rate of the chloride ions. The cement-based material can enhance the physical adsorption binding capacity of cement to chloride ions, and further reduce the corrosion of the chloride ions to reinforcing steel bars.
The technical scheme adopted by the invention is as follows: a cement-based material for improving the binding rate of chloride ions comprises the following components in parts by mass based on the mass of cement
100% of Portland cement;
8-10% of kaolin;
0.8-1.2% of naphthalene sulfonate water reducing agent;
1 ~ 3% of calcium nitrate.
Further, the kaolin is sandy kaolin.
further, the Portland cement further comprises graphene and a nano material dispersing agent, wherein the using amount of the graphene is 0.05 ~ 0.10% of the mass of the Portland cement.
Further, the nano material dispersing agent is sodium dodecyl benzene sulfonate.
further, the thickness of the graphene is 2.0 ~ 4.0nm, and the specific surface area is 360 ~ 450m2/g。
The invention also relates to a preparation method of the cement-based material for improving the chloride ion binding rate, which comprises the following steps
s01, dissolving 0.05 ~ 0.10% of graphene, a nano material dispersant, 0.5 ~ 1.5% of a naphthalenesulfonate water reducer and 1 ~ 3% of calcium nitrate into mixing water, and performing ultrasonic dispersion to obtain a mixing water solution;
S02, mixing and stirring the portland cement, the kaolin and the mixed water solution to form cement paste;
S03, forming the cement paste with fluidity;
0.05 ~ 0.10% of graphene, 0.5 ~ 1.5% of naphthalene sulfonate water reducing agent and 1 ~ 3% of calcium nitrate are based on the dosage of portland cement.
further, in the step S01, the ultrasonic time is 30 ~ 40 minutes, the ultrasonic frequency of the ultrasonic wave is 40kHz, and the power density is 0.5 ~ 0.7w/cm2。
further, the dosage of the kaolin is 8 ~ 10% of that of the portland cement.
The beneficial effects produced by the invention comprise: the graphene nanosheets in the cement-based material can improve the workability and strength of concrete, and can promote the microcrystallization of cement components and attach to C-S-H gel on a microscopic level, so that the capacity of adsorbing and combining chloride ions by the C-S-H gel is improved. Ca (NO) in cement-based materials3)2Soluble calcium ions can be introduced into the cement-based material to obtain C-S-H gel with higher Ca/Si ratio, so that the physical adsorption binding capacity to chloride ions is enhanced, and the method can greatly improve the chloride ion binding rate of the cement-based material.
The naphthalene sulfonate water reducing agent not only reduces the water consumption and improves the strength of cement-based materials, but also can wrap cement particles on a microscopic level, and increase the specific surface area of the cement particles, therebyafter the conventional curing for 28 days, the hydration degree is improved, more hydration products which are easy to combine with free chloride ions are generated, and the performance of combining with the chloride ions is improved. The kaolin added by the method increases the raw materials for forming cement components capable of combining with chloride ions, and also improves the physical and chemical chloride ion combining capability of the cement-based materials. In conclusion, the cement-based material for improving the chloride ion binding rate increases cement hydration products C-S-H gel and C capable of binding chloride ions through the combined action of all components3AH6The content and the Ca/Si ratio are improved, and the chloride ion binding rate of the cement-based material can be obviously and effectively improved.
Detailed Description
The present invention is explained in further detail below with reference to specific embodiments, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Comparative example
Raw materials: ordinary portland cement. The preparation process comprises the following steps:
(1) Mixing ordinary Portland cement and mixing water according to the water cement ratio of 0.5, and stirring to form cement paste.
(2) Pouring the slurry with fluidity into a 40X 160mm mold for molding, demolding after 24 hours, and curing for 28 days under the conditions that the relative humidity is 60% and the temperature is 22 ℃.
Example 1
Raw materials: ordinary portland cement, kaolin, naphthalene sulfonate water reducing agent, graphene, nano material dispersant and Ca (NO)3)2. The preparation process comprises the following steps:
(1) Graphene accounting for 0.05 percent of the mass of the cement, a nano material dispersant, a naphthalene sulfonate water reducing agent accounting for 0.8 percent of the mass of the cement and Ca (NO) accounting for 2 percent of the mass of the cement3)2Dissolving in mixed water, and performing ultrasonic dispersion for 40 min at ultrasonic frequency of 40kHz and power density of 0.6w/cm2。
(2) Ordinary portland cement, kaolin accounting for 8 percent of the mass of the cement and the ultrasonically dispersed mixing water solution are mixed and stirred according to the water cement ratio of 0.5 to form cement paste.
(3) Pouring the slurry with fluidity into a 40X 160mm mold for molding, demolding after 24 hours, and curing for 28 days under the conditions that the relative humidity is 60% and the temperature is 22 ℃.
Example 2
Raw materials: ordinary portland cement, kaolin, naphthalene sulfonate water reducing agent, graphene, nano material dispersant and Ca (NO)3)2. The preparation process comprises the following steps:
(1) Graphene accounting for 0.10 percent of the mass of the cement, a nano material dispersant, a naphthalene sulfonate water reducing agent accounting for 1.2 percent of the mass of the cement and Ca (NO) accounting for 2 percent of the mass of the cement3)2Dissolving in mixed water, and performing ultrasonic dispersion for 40 min at ultrasonic frequency of 40kHz and power density of 0.6w/cm2。
(2) Ordinary portland cement, kaolin accounting for 8 percent of the mass of the cement and the ultrasonically dispersed mixing water solution are mixed and stirred according to the water cement ratio of 0.5 to form cement paste.
(3) Pouring the slurry with fluidity into a 40X 160mm mold for molding, demolding after 24 hours, and curing for 28 days under the conditions that the relative humidity is 60% and the temperature is 22 ℃.
Example 3
raw materials: ordinary portland cement, kaolin, naphthalene sulfonate water reducing agent, graphene, nano material dispersant and Ca (NO)3)2. The preparation process comprises the following steps:
(1) Graphene accounting for 0.10% of the mass of the cement, a nano material dispersing agent, a naphthalene sulfonate water reducing agent accounting for 1.2% of the mass of the cement and Ca (NO) accounting for 3% of the mass of the cement3)2dissolving in mixed water, and performing ultrasonic dispersion for 40 min at ultrasonic frequency of 40kHz and power density of 0.6w/cm2。
(2) ordinary portland cement, kaolin accounting for 10 percent of the mass of the cement and the ultrasonically dispersed mixing water solution are mixed and stirred according to the water cement ratio of 0.5 to form cement paste.
(3) Pouring the slurry with fluidity into a 40X 160mm mold for molding, demolding after 24 hours, and curing for 28 days under the conditions that the relative humidity is 60% and the temperature is 22 ℃.
after the steps, chiseling the outer surface of a test piece by using a geological hammer, cutting the test piece into small pieces by using a cutting machine, appropriately crushing the small pieces by using a crushing machine, screening the small pieces to obtain a plurality of particles with the particle sizes of 0.63-1.25 mm, drying the particles for 24 hours in a blast drying oven at 40 ℃, respectively weighing 20g of the particles in each example, placing the particles in a 100mL plastic bottle, adding 80mL of 0.1mol/L sodium chloride solution, sealing, shaking uniformly, standing the particles for 14 days, filtering the solution, taking 10mL of filtrate, carrying out potentiometric titration on the filtrate by using 0.05mol/L silver nitrate solution to obtain the consumed volume V (mL), and obtaining the corresponding chloride ion binding rate B of which is B = (0.1-V × 0.05/10)/0.1-V/20
the improvement rate of chloride ion binding compared with the comparative example is as follows: pB=(B-B0)/B0×100%
The results obtained are shown in table 1.
Table 1 shows the binding rate B and binding enhancement rate P of chloride ions in each exampleB
| Chloride ion binding Rate B | chloride ion binding enhancement ratio PB | |
| Comparative example | 18.4% | / |
| Example 1 | 25.8% | 40.2% |
| Example 2 | 26.6% | 44.6% |
| Example 3 | 28.1% | 52.7% |
according to the implementation results, the cement-based material has obvious effects in the chloride ion binding rate compared with the common Portland cement, and the chloride ion binding rate of the cement-based material in the invention is as high as 52.7%.
The embodiments described above are intended to facilitate one of ordinary skill in the art in understanding and using the present invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the embodiments described herein, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (8)
1. A cement-based material for improving the binding rate of chloride ions is characterized in that: based on the mass of the Portland cement, the Portland cement comprises the following components in percentage by mass
100% of Portland cement;
8-10% of kaolin;
0.8-1.2% of naphthalene sulfonate water reducing agent;
1 ~ 3% of calcium nitrate.
2. The cement-based material for increasing chloride ion binding rate according to claim 1, wherein: the kaolin is sandy kaolin.
3. the cement ~ based material for improving the chloride ion binding rate according to claim 1, further comprising graphene and a nano ~ material dispersing agent, wherein the amount of the graphene is 0.05 ~ 0.10% of the mass of the portland cement.
4. The cement-based material for increasing chloride ion binding rate according to claim 3, wherein: the nano material dispersant is sodium dodecyl benzene sulfonate.
5. the cement ~ based material for improving the chloride ion binding rate according to claim 3, wherein the graphene has a thickness of 2.0 ~ 4.0nm and a specific surface area of 360 ~ 450m2/g。
6. A preparation method of a cement-based material for improving the chloride ion binding rate is characterized by comprising the following steps: comprises the following steps
S01, dissolving 0.05 ~ 0.10% of graphene, a nano material dispersant, 0.5 ~ 1.5% of a naphthalenesulfonate water reducer and 1 ~ 3% of calcium nitrate into mixing water, and performing ultrasonic dispersion to obtain a mixing water solution;
S02, mixing and stirring the portland cement, the kaolin and the mixed water solution to form cement paste;
S03, forming the cement paste with fluidity;
0.05 ~ 0.10% of graphene, 0.5 ~ 1.5% of naphthalene sulfonate water reducing agent and 1 ~ 3% of calcium nitrate are based on the dosage of portland cement.
7. the method for preparing a cement ~ based material with an improved chloride ion binding rate according to claim 6, wherein the ultrasonic time in the step S01 is 30 ~ 40 minutes, the ultrasonic frequency of the ultrasonic wave is 40kHz, and the power density is 0.5 ~ 0.7w/cm2。
8. the method for preparing the cement ~ based material with the improved chloride ion binding rate according to claim 6, wherein the dosage of the kaolin is 8 ~ 10% of that of the Portland cement.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111592320A (en) * | 2020-05-29 | 2020-08-28 | 中建西部建设新疆有限公司 | Gelling system with chloride ion curing performance and preparation method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101239792A (en) * | 2008-03-12 | 2008-08-13 | 中南大学 | Additive for increasing cement-base material solidifying dissociative chlorine ion capability and applying method thereof |
| CN107056183A (en) * | 2017-01-23 | 2017-08-18 | 常州第六元素材料科技股份有限公司 | A kind of graphene oxide concrete composite material of chloride-penetration resistance and preparation method thereof |
| CN109133802A (en) * | 2018-10-17 | 2019-01-04 | 大连理工大学 | A kind of cement-based material and preparation method thereof of Xi Fu ﹑ curing of chloride ion |
| CN109336493A (en) * | 2018-09-26 | 2019-02-15 | 张园 | A kind of nano material improvement cement-based material and its application in highway |
| CN109336502A (en) * | 2018-10-29 | 2019-02-15 | 成都新柯力化工科技有限公司 | A kind of self film anti-corrosion marine structure concrete material and preparation method thereof |
| KR101953106B1 (en) * | 2018-06-22 | 2019-02-28 | 박정준 | Surface-reinforced super-early-hardening cement concrete composition with improved durability and repairing method of concrete structure therewith |
| CN110204274A (en) * | 2019-05-29 | 2019-09-06 | 华南理工大学 | A kind of preparation method of the highly resistance sea water intrusion complex cement based on cementitious material |
-
2019
- 2019-10-16 CN CN201910980848.8A patent/CN110563351B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101239792A (en) * | 2008-03-12 | 2008-08-13 | 中南大学 | Additive for increasing cement-base material solidifying dissociative chlorine ion capability and applying method thereof |
| CN107056183A (en) * | 2017-01-23 | 2017-08-18 | 常州第六元素材料科技股份有限公司 | A kind of graphene oxide concrete composite material of chloride-penetration resistance and preparation method thereof |
| KR101953106B1 (en) * | 2018-06-22 | 2019-02-28 | 박정준 | Surface-reinforced super-early-hardening cement concrete composition with improved durability and repairing method of concrete structure therewith |
| CN109336493A (en) * | 2018-09-26 | 2019-02-15 | 张园 | A kind of nano material improvement cement-based material and its application in highway |
| CN109133802A (en) * | 2018-10-17 | 2019-01-04 | 大连理工大学 | A kind of cement-based material and preparation method thereof of Xi Fu ﹑ curing of chloride ion |
| CN109336502A (en) * | 2018-10-29 | 2019-02-15 | 成都新柯力化工科技有限公司 | A kind of self film anti-corrosion marine structure concrete material and preparation method thereof |
| CN110204274A (en) * | 2019-05-29 | 2019-09-06 | 华南理工大学 | A kind of preparation method of the highly resistance sea water intrusion complex cement based on cementitious material |
Non-Patent Citations (2)
| Title |
|---|
| 严捍东: "《新型建筑材料教程》", 31 January 2005, 中国建材工业出版社 * |
| 于玲等: "《海排灰在道路基层及底基层中的应用研究》", 31 December 2018, 合肥工业大学出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111592320A (en) * | 2020-05-29 | 2020-08-28 | 中建西部建设新疆有限公司 | Gelling system with chloride ion curing performance and preparation method thereof |
| CN111592320B (en) * | 2020-05-29 | 2022-03-18 | 中建西部建设新疆有限公司 | Gelling system with chloride ion curing performance and preparation method thereof |
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