CN111825418A - Novel rapid repair cement based on magnesium oxysulfate cementing material and preparation method thereof - Google Patents
Novel rapid repair cement based on magnesium oxysulfate cementing material and preparation method thereof Download PDFInfo
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- CN111825418A CN111825418A CN202010726162.9A CN202010726162A CN111825418A CN 111825418 A CN111825418 A CN 111825418A CN 202010726162 A CN202010726162 A CN 202010726162A CN 111825418 A CN111825418 A CN 111825418A
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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
- 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
- C04B28/30—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 containing magnesium cements or similar cements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/08—Producing shaped prefabricated articles from the material by vibrating or jolting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
- B28B13/04—Discharging the shaped articles
- B28B13/06—Removing the shaped articles from moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
-
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- 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
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
-
- 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
- C04B2111/72—Repairing or restoring existing buildings or building materials
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides novel rapid repair cement based on a magnesium oxysulfate cementing material and a preparation method thereof, and is characterized by comprising the following raw materials in parts by weight: 45-55 parts of light-burned magnesia powder, 30-40 parts of magnesium sulfate solution, 2-7 parts of aluminate cement clinker with the label of CA-50 or the label of CA-70 and 0.2-0.7 part of citric acid. The novel rapid repair cement based on the magnesium oxysulfate cementing material provided by the invention has the advantages of short setting time, high early strength and good stability, and has the advantages of reduced cost and environmental protection on the premise of ensuring the performances of the cement, such as use strength, impermeability, stability and the like, thereby having positive significance for the development of future magnesium resources and the preparation of rapid repair cement.
Description
Technical Field
The invention belongs to the technical field of cement production, and particularly relates to novel rapid repair cement based on a magnesium oxysulfate cementing material and a preparation method thereof.
Background
The cement rapid repairing material is composed of a hydraulic cementing material, a mineral admixture, a fine aggregate additive and the like, a certain amount of water or other liquid is required to be uniformly stirred when the cement rapid repairing material is used, complex construction machinery and technical requirements are not required during construction, long-time traffic sealing is also not required, and the cement rapid repairing material is suitable for highway engineering cement concrete repairing materials with traffic opening within 8 hours. The cement pavement patching material is specially used for timely patching the defects of the cement concrete pavement, such as pitted surface, hollowing, peeling, sanding, shelling, cracks, exposed ribs, peeled peel, exposed stones and the like. The compressive strength 24 hours after construction can reach 22MPa, the later strength is continuously increased, the peak compressive strength reaches more than 100MPa, the composite material has good reinforcing and supporting effects on the damaged part, the compression resistance requirement of a road without special load can be met by repairing the part with the thickness of 3mm, and the composite material cannot be broken and fall off in a high-speed and high-pressure driving state. The method has the advantages that the method does not need to excavate the damaged part, can save a large amount of construction cost, material cost and maintenance time, effectively delays the diffusion and spread of road diseases, and prolongs the service life of the road; the color of the repaired cement concrete pavement is close to that of the original cement concrete pavement, the repaired cement concrete pavement has better aesthetic degree, and all cement concrete surface diseases are suitable for the material. After a lot of cement pavement diseases appear, if the diseases are not repaired in time, the diseases can be rapidly developed into incurable diseases, at present, an ideal scheme is not provided, the diseases are basically repaired after the diseases are developed to a certain degree, a large amount of precious materials are wasted, and meanwhile, the long-time road sealing cost is more and more emphasized. The development of materials and technologies capable of timely repairing the surface diseases contributes to the maintenance of cement concrete roads in China and the reduction of material waste. However, the problems of strength reverse shrinkage, high cost, unstable performance and the like still limit the application of the composite material.
Currently, patent No. CN106699037A discloses a preparation method of a geopolymer grouting material, which is a novel aluminosilicate inorganic cementing material generated by reacting an active aluminosilicate material (metakaolin, clay, slag, fly ash, silica fume, etc.) with a strong base or a strong base silicate solution. The method is widely applicable to engineering parts such as rapid road repair, cement concrete pavement slab bottom grouting, soft foundation treatment, bridge reinforcing crack repair, deep curtain grouting, foundation bolt anchoring and the like. Patent No. CN106431144B discloses a road concrete and a preparation method thereof, which is prepared by stirring and mixing all components in a stirrer, and has simple preparation method and low technical requirement. The ferronickel slag micro powder and the slag powder are added as main admixtures, so that the 'superposition effect' among the admixture components is exerted, the advantages are complemented, the performance defect caused by singly doping one component is avoided, and the breaking strength and the compressive strength of the road concrete are improved. For another example, patent No. CN110372320A discloses a method for proportioning phosphate cement mortar. The phosphate cement has the characteristics of short setting time, high early strength, strong bonding capacity, small volume deformation and the like, and has wide prospects in the aspects of rush repair and rush construction of civil buildings such as airport runways, tunnels, mines and the like and national defense projects. Most of the materials are prepared by adopting pure calcium aluminate cement or magnesium phosphate cement slurry, can meet the use requirements, but have higher price and the problems of unstable performance in the later period and the like.
The magnesium oxysulfate cementing material has the characteristics of early strength, quick hardening, high cohesiveness and the like, has excellent corrosion resistance, high strength and stability, can be used for preparing magnesium products, ornaments and the like, has high cost performance and excellent performance, and is one of important development directions of the cementing material industry in the future. The rapid repair cement prepared by the magnesium oxysulfate cementing material is not reported.
Disclosure of Invention
The invention aims to provide novel rapid repair cement based on a magnesium oxysulfate cementing material and a preparation method thereof, overcomes the defects of the prior art, prepares the rapid repair cement by combining the magnesium oxysulfate cementing material with the characteristics of early strength, rapid hardening, high caking property and the like, excellent erosion resistance, higher strength and stability and aluminate cement clinker of which the label is CA-50 or CA-70, furthest reduces the cost for preparing the rapid repair cement, and is favorable for coordinating resource development.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the technical scheme is as follows: the novel rapid repair cement based on the magnesium oxysulfate cementing material is characterized by comprising the following raw materials in parts by weight: 45-55 parts of light-burned magnesia powder, 35-45 parts of magnesium sulfate solution, 2-7 parts of aluminate cement clinker and 0.2-0.7 part of citric acid.
Further, the magnesium sulfate solution comprises the following components in percentage by weight: 42-47% of magnesium sulfate heptahydrate and 53-58% of water.
Further, the aluminate cement clinker is marked as CA-50 or CA-70.
Further, the particle size of the light-burned magnesia powder is 4.570-4.900 mu m, the specific surface area is 470.3-486.7m2/kg, and the content of active magnesia is not lower than 65%.
Further, MgSO is contained in magnesium sulfate heptahydrate4·7H2The O content was 99.7%.
Furthermore, the citric acid is a chemical pure reagent, and the content of the citric acid is more than or equal to 99.9 percent.
The second technical proposal is that: the preparation method of the novel rapid repair cement based on the magnesium oxysulfate cementing material is characterized in that the preparation process comprises the steps of premixing raw materials, dissolving a medicine, stirring and mixing, molding by casting, demolding and maintaining, and specifically comprises the following steps:
(1) premixing raw materials, namely placing the light-burned magnesia powder and the aluminate cement clinker of the total formula amount in a stirrer, stirring for 2-3 min, and uniformly stirring and mixing to obtain a mixture;
(2) dissolving the medicine, namely putting magnesium sulfate heptahydrate and water in the formula ratio into a stirrer, stirring for 3-4 min, and uniformly stirring and mixing to fully dissolve the solute to obtain a magnesium sulfate solution; then, placing the citric acid and magnesium sulfate solution with the formula amount in a stirrer to stir for 3-4 min, and standing by after the citric acid is completely dissolved;
(3) stirring and mixing, namely putting the mixture obtained in the step (1) and the solution prepared in the step (2) into a stirrer for four times, stirring for 2-4 min each time, and stirring and mixing to obtain the rapid repair cement slurry;
(4) pouring the obtained quick repair cement slurry into a mold for mold pouring and forming, and performing vibration exhaust;
(5) demolding and maintaining, namely, placing the mold and the slurry after mold casting under the maintaining condition of humidity of 70-80RH and temperature of 25-30 ℃ for maintaining for 1-2h, and then demolding.
Compared with the prior art, the invention has the beneficial effects that:
1) the quick repair cement has the 1d strength of more than or equal to 40.0MPa, the initial setting time of more than or equal to 20min, the final setting time of less than or equal to 80min and the fluidity of less than or equal to 20 s. Meets CRMM-II type standard in JT/T1211.1-2018: the initial setting time is more than or equal to 20min, the open traffic time is not more than 2h, and the compressive strength is more than or equal to 30.0MPa when the traffic is open.
2) The waterproof mortar has the advantages of good fluidity, impermeability, corrosion resistance, high cost performance, higher normal-temperature compressive strength, more superior durability in corrosion resistance, thermal shock resistance, scouring resistance, and the like, has no pollution of raw materials and hydration products, and can be widely applied to engineering applications such as rapid road repair, cement concrete pavement repair, soft foundation treatment, bridge reinforcement crack repair, foundation bolt anchoring, and the like.
3) The rapid repair cement has the advantages of stable and adjustable performance and simple operation, reduces the traditional sintering process, effectively reduces the carbon dioxide emission and simultaneously reduces the energy consumption compared with the common Portland cement, and has positive environmental protection significance.
Detailed Description
The following examples are presented to further illustrate embodiments of the present invention:
exemplary embodiments of the present disclosure will be described in greater detail below, however, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
MgSO in magnesium sulfate heptahydrate used in the following examples of the invention4·7H2The O content is 99.7%; the citric acid is a purifying reagent, and the content of the citric acid is more than or equal to 99.9 percent. Wherein the aluminate cement clinker is CA-50 or CA-70, and the chemical composition thereof is Al2O3The content is 53-80%, and other mineral components comprise CA and CA2、C2AS and alpha-Al2O3。
Example 1
The invention relates to a novel rapid repair cement based on magnesium oxysulfate cementing material, which comprises the following raw materials in percentage by weight: 150g of light-burned magnesia powder, 15g of aluminate cement clinker marked by CA-50, 55g of magnesium sulfate heptahydrate, 65g of water and 0.8g of citric acid.
The preparation method specifically comprises the following steps:
(1) placing all the light-burned magnesia powder and the aluminate cement clinker with the CA-50 label in a stirrer, stirring for 2-3 min, and uniformly stirring and mixing to obtain a mixture;
(2) putting all magnesium sulfate heptahydrate and water into a stirrer, stirring for 3-4 min, and uniformly stirring and mixing to fully dissolve a solute to obtain a magnesium sulfate solution; putting all citric acid and magnesium sulfate solution into a stirrer, stirring for 3-4 min, and standing by after citric acid is completely dissolved;
(3) putting the mixture obtained in the step 1) and the solution prepared in the step 2) into a stirrer for four times, stirring for 2-4 min each time, and stirring and mixing to obtain quick-repairing cement slurry;
(4) pouring the obtained quick repair cement slurry into a mold, performing mold casting molding, and performing vibration exhaust;
(6) and curing the mold and the slurry after the mold casting for 1-2h under the curing condition that the humidity is 70-80RH and the temperature is 25-30 ℃, and then demolding.
Example 2
The invention relates to a novel rapid repair cement based on magnesium oxysulfate cementing material, which comprises the following raw materials in percentage by weight: 150g of light-burned magnesia powder, 8g of aluminate cement clinker marked by CA-50, 55g of magnesium sulfate heptahydrate, 65g of water and 0.8g of citric acid.
The preparation method is the same as example 1.
Example 3
The invention relates to a novel rapid repair cement based on magnesium oxysulfate cementing material, which comprises the following raw materials in percentage by weight: 150g of light-burned magnesia powder, 8g of aluminate cement clinker marked by CA-70, 55g of magnesium sulfate heptahydrate, 65g of water and 0.8g of citric acid.
The preparation method is the same as example 1.
Comparative example
The geopolymer grouting material is prepared by a preparation method of the geopolymer grouting material disclosed in the patent number CN 106699037A.
The test results of setting time (min), fluidity (mm), and compression strength (MPa) of test pieces aged for 2h, 1 day, 3 days, and 28 days of the rapid repair cement materials prepared in the above examples 1 to 3 are shown in table 1 below, and a geopolymer grouting material for rapid road repair is commonly commercially available as a comparative example.
Table 1 results of performance test of experimental samples of each example
As can be seen from the data in the table above, compared with the geopolymer which is sold in the market and used for rapid road repair, the novel rapid repair cement based on the magnesium oxysulfate cementing material has the advantages of better performance, good fluidity, permeability and corrosion resistance, high cost performance, higher normal-temperature compressive strength, more superior durability, no pollution of raw materials and hydration products, adjustable performance, easier obtainment of the raw materials and good economic benefit.
The fluidity test example 2 is more excellent than the comparative example; the strength of the comparative example 28d is reversed and reduced and is only 49.6MPa, and the experimental examples are all larger than the value; the impervious strength is grade I; and the production raw materials and hydration products for preparing the magnesium oxysulfate cementing material are pollution-free and environment-friendly.
It is clear that the process according to the invention is only a preferred embodiment and is not intended to limit the scope of protection of the invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (7)
1. The novel rapid repair cement based on the magnesium oxysulfate cementing material is characterized by comprising the following raw materials in parts by weight: 45-55 parts of light-burned magnesia powder, 35-45 parts of magnesium sulfate solution, 2-7 parts of aluminate cement clinker and 0.2-0.7 part of citric acid.
2. The novel rapid repair cement based on magnesium oxysulfate cementing material according to claim 1, wherein the magnesium sulfate solution comprises the following components in percentage by weight: 42-47% of magnesium sulfate heptahydrate and 53-58% of water.
3. A new fast repair cement based on magnesium oxysulfate cement as claimed in claim 1, characterized in that said aluminate cement clinker is designated CA-50 or CA-70.
4. The novel rapid repair cement based on magnesium oxysulfate cementing material according to claim 1, characterized in that the particle size of the light-burned magnesia powder is 4.570-4.900 μm, and the specific surface area is 470.3-486.7m2/kg, wherein the content of active magnesium oxide is not less than 65 percent.
5. The novel rapid repair cement based on magnesium oxysulfate cement according to claim 1, wherein MgSO in magnesium sulfate heptahydrate4·7H2The O content was 99.7%.
6. The novel rapid repair cement based on magnesium oxysulfate cementing material according to claim 1, characterized in that the citric acid is a chemically pure reagent, and the citric acid content is not less than 99.9%.
7. The preparation method of the novel rapid repair cement based on the magnesium oxysulfate cementing material is characterized in that the preparation process comprises the steps of premixing raw materials, dissolving a medicine, stirring and mixing, molding by casting, demolding and maintaining, and specifically comprises the following steps:
(1) premixing raw materials, namely placing the light-burned magnesia powder and the aluminate cement clinker of the total formula amount in a stirrer, stirring for 2-3 min, and uniformly stirring and mixing to obtain a mixture;
(2) dissolving the medicine, namely putting magnesium sulfate heptahydrate and water in the formula ratio into a stirrer, stirring for 3-4 min, and uniformly stirring and mixing to fully dissolve the solute to obtain a magnesium sulfate solution; then, placing the citric acid and magnesium sulfate solution with the formula amount in a stirrer to stir for 3-4 min, and standing by after the citric acid is completely dissolved;
(3) stirring and mixing, namely putting the mixture obtained in the step (1) and the solution prepared in the step (2) into a stirrer for four times, stirring for 2-4 min each time, and stirring and mixing to obtain the rapid repair cement slurry;
(4) pouring the obtained quick repair cement slurry into a mold for mold pouring and forming, and performing vibration exhaust;
(5) demolding and maintaining, namely, placing the mold and the slurry after mold casting under the maintaining condition of humidity of 70-80RH and temperature of 25-30 ℃ for maintaining for 1-2h, and then demolding.
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| CN202010726162.9A CN111825418A (en) | 2020-07-25 | 2020-07-25 | Novel rapid repair cement based on magnesium oxysulfate cementing material and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114149242A (en) * | 2021-11-29 | 2022-03-08 | 辽宁科大中驰镁建材科技有限公司 | Novel fireproof building material based on magnesium oxysulfate cementing material |
| CN115745563A (en) * | 2022-12-09 | 2023-03-07 | 沈阳工业大学 | Quick repairing material for cement concrete pavement and preparation method |
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| CN106882933A (en) * | 2017-01-18 | 2017-06-23 | 宁波大学 | A kind of anti-folding magnesium oxysulfide base inorganic composite gel material high |
| CN107010892A (en) * | 2017-04-07 | 2017-08-04 | 俞家欢 | It is a kind of not disperse fast hard cement-base composite material of rapid hardening and its preparation method and application under water |
| CN109704604A (en) * | 2019-02-25 | 2019-05-03 | 北京科技大学 | A kind of modified magnesium oxysulfide concrete and preparation method thereof |
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| CN106882933A (en) * | 2017-01-18 | 2017-06-23 | 宁波大学 | A kind of anti-folding magnesium oxysulfide base inorganic composite gel material high |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114149242A (en) * | 2021-11-29 | 2022-03-08 | 辽宁科大中驰镁建材科技有限公司 | Novel fireproof building material based on magnesium oxysulfate cementing material |
| CN115745563A (en) * | 2022-12-09 | 2023-03-07 | 沈阳工业大学 | Quick repairing material for cement concrete pavement and preparation method |
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Application publication date: 20201027 |