CN107973565B

CN107973565B - Anti-corrosion and anti-freezing mortar and preparation method thereof

Info

Publication number: CN107973565B
Application number: CN201810079232.9A
Authority: CN
Inventors: 苏杰; 李国凡; 赵永胜; 李海康; 钱波; 张富春; 刘轶新
Original assignee: Inner Mongolia Zhonglu Huatong Building Material Co ltd; Inner Mongolia Chuolei Water Conservancy Water Power Co ltd
Current assignee: Inner Mongolia Zhonglu Huatong Building Material Co ltd; Inner Mongolia Chuolei Water Conservancy Water Power Co ltd
Priority date: 2018-01-26
Filing date: 2018-01-26
Publication date: 2020-06-05
Anticipated expiration: 2038-01-26
Also published as: CN107973565A

Abstract

The invention provides an anticorrosive freeze-thaw resistant mortar, which is mainly prepared from powder and emulsion in a mass ratio of (4-6): 1, the powder comprises: by mass, 400 parts of cement 300-; the emulsion comprises: the cationic neoprene emulsion is 20-30%, the vinyl acetate-ethylene copolymer emulsion is 20-30%, and the balance is drinking water. The preparation method comprises the following steps: and respectively preparing the powder and the emulsion, and then uniformly stirring and mixing the powder and the emulsion according to a certain proportion. The anti-corrosion and freeze-thaw resistant mortar disclosed by the invention has the dual performances of corrosion resistance and freeze-thaw resistance, and is worthy of wide popularization and application.

Description

Anti-corrosion and anti-freezing mortar and preparation method thereof

Technical Field

The invention relates to the field of construction, in particular to anticorrosive freeze-thaw resistant mortar for construction and a preparation method thereof.

Background

Cement, powdered hydraulic inorganic cementing material. The water is added and stirred to form slurry which can be hardened in the air or better hardened in the water and can firmly bond sand, stone and other materials together. The early lime and pozzolan mixtures are similar to modern lime and pozzolan cements, and concrete made by cementing crushed stone with them not only has higher strength after hardening, but also resists erosion by fresh water or salt-containing water. As an important cementing material, the high-performance cement is widely applied to engineering such as civil construction, water conservancy, national defense and the like for a long time.

However, ordinary concrete has low compression ratio, low compression ratio of ordinary concrete, poor impermeability, poor crack resistance, poor corrosion resistance and the like, and although improved materials such as reinforced concrete appear along with the technical development, the performance of cement in the materials is not changed, so that the improvement of the performance of concrete is limited.

In recent years, it has become a hot point of research how to modify cement to improve its performance, and it is a new research direction to obtain cement-based composite materials with good performance by mixing and matching cement with different modifiers, for example, in order to increase the corrosion resistance of cement mortar itself, it is possible to mix and match cement with a certain amount of fibers and organic substances to increase the corrosion resistance of mortar itself.

In the prior art, in the aspect of hydraulic engineering application, a concrete dam body needs to be watered for a long time, and the phenomenon of severe freeze thawing and denudation occurs; certain acid and alkali corrosion conditions exist; acid mist, salt mist and other corrosive gas mist in the air cause permanent damage to the dam body; in addition, the ultraviolet irradiation time is longer, and the ultraviolet lamp also has the function of removing the disabilities accumulated in the days and the months due to wind, sand, rain and snow. The maintenance of the water conservancy project with various diseases and oligomers can not be solved by using the traditional common corrosion-resistant mortar material.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

The first purpose of the invention is to provide a corrosion-resistant freeze-thaw resistant mortar, which is a novel high molecular polymer mortar, wherein the powder material is a brand new cementing material prepared by accurately mixing inorganic cementing materials, graded sand, mineral fillers and high molecular polymer auxiliaries as raw materials according to a certain proportion in a dry state, and the product is gray, powdery, nontoxic and odorless in an original state; the emulsion is a high-molecular polymerization emulsion, belongs to a green environment-friendly material, can well resist degradation such as freeze thawing and polluted water damage, has dual performances of corrosion resistance and freeze thawing resistance, has low subsequent maintenance cost, only needs simple spray maintenance for 2-3 days, has very excellent mechanical properties such as mechanics and the like, has all data far exceeding the relevant national standards, is not easy to crack, has good stability, and is worthy of wide popularization and application.

The second purpose of the invention is to provide the preparation method of the anti-corrosion freeze-thaw resistant mortar, which is simple and convenient to operate, has the advantages of close connection of the front step and the rear step, mild operation condition, no generation of three wastes, and environmental protection.

In order to achieve the above purpose of the present invention, the following technical solutions are adopted:

the invention provides an anticorrosive freeze-thaw resistant mortar, which is mainly prepared from powder and emulsion in a mass ratio of (4-6): 1, the powder comprises: by mass, 400 parts of cement 300-;

the emulsion comprises: the cationic neoprene emulsion is 20-30%, the vinyl acetate-ethylene copolymer emulsion is 20-30%, and the balance is drinking water.

In the prior art, the mortar has various types, mainly including:

1. the common cement mortar and high-strength concrete repairing material can not solve the problem of bonding strength with an original base layer, and can cause hollowing, cracking and final falling; the surface layer can not bear freeze thawing damage and water pollution erosion, and finally the repairing effect can not be achieved as before;

2. if the rubber powder content of the polymer bonding mortar and the polymer anti-cracking mortar is enough, even the bonding problem with an original base layer is solved, the damage to freeze thawing and polluted water can not be resisted;

3. compared with the common polymer mortar, the waterproof mortar has better impermeability and waterproof effect under the condition of no pressure water, but under the action of the pressure water, the waterproof mortar cannot be competent, and the damage to freeze thawing and water quality pollution erosion cannot be mentioned;

4. the epoxy mortar has high bonding strength with a base layer and obvious waterproof effect, has the defects of weak ultraviolet resistance, can be aged quickly by long-time direct sunlight, and is only suitable for underground buildings or environments without direct sunlight; the elasticity is not enough, and when the base layer expands and contracts, the epoxy mortar is not enough along with the deformation, so that the epoxy mortar can crack or fall off; the manufacturing cost is high; wet base surfaces are not operational; contains toxic substances to human bodies, is not environment-friendly enough, and is not selectable especially for hydraulic engineering.

The invention aims to solve the technical problems, and provides the high polymer anticorrosive mortar comprehensive mortar, which has a wide application range, is very suitable for being applied to concrete buildings, especially water conservancy hydraulic concrete corrosion repair due to good anticorrosive and freeze-thaw resistance, has simple and convenient subsequent maintenance work, reduces the operation cost, and is suitable for ensuring the full performance of the mortar after the preparation is finished and is used up within 2 hours at best.

It should be noted that the specific selection of each component of the present invention is obtained by the inventor through a great number of operation practices, especially on the selection of the components of the emulsion itself, after a great number of experiments on the types of acrylic emulsion, styrene-butadiene emulsion, neoprene emulsion, cationic neoprene emulsion, acrylate, epoxy, chlorinated rubber, vinyl acetate-ethylene copolymer emulsion, the inventor finds that good effects can be obtained only after the cationic neoprene emulsion and the vinyl acetate-ethylene copolymer emulsion are mixed and matched in a certain proportion, and the specific practice process is as follows:

1. the emulsion comprises the following components in percentage by weight:

TABLE 1 specific emulsion types

2. Physical property test screening: the setting time and the operable time are all qualified; the 3 groups of test blocks with the bending strength LH-2 series are all qualified except that the test blocks do not meet the standard; the 3 groups of test blocks with the compressive strength LH-7 series are not up to the standard, and the others are all qualified; the bonding and drawing strength LH-7 series 3 test blocks are not up to the standard, and the others are all qualified; the shear bonding strength is all qualified; the shrinkage rates of the components are LH-1, LH-3, LH-4 and LH-8, and the others are not qualified; therefore, the basic formula is determined to be the formula LH-1\ LH-3\ LH-4\ LH-8 for continuous test.

3. Screening the sulfuric acid corrosion resistance: the test blocks LH-1, LH-3, LH-4 and LH-8 are immersed in 5% sulfuric acid solution, after 10 days, the test blocks LH-1-2 and LH-1-3 are skinned, and foam attachments LH-3-2 and LH-3-3 appear, so that the series LH-4 and LH-8 are normal.

4. Screening the hydrochloric acid corrosion resistance: the test blocks LH-4-1, LH-4-2 and LH-8-1 are immersed in 20% hydrochloric acid solution, and after 10 days, the test blocks are normal without peeling, bulging, powdering or other abnormal phenomena.

5. LH-4-2 and LH-8-1 are respectively subjected to water absorption experiments, and the water absorption is 1.5% after the water is soaked for 48 hours. After 7 days, LH-4 was 3% and LH-8 was 3.7%. The two groups of test blocks are qualified, and in conclusion, the cationic neoprene latex becomes the first choice for adding the mortar.

In addition to the concern about the corrosion resistance and the mechanical property of the mortar, a large number of mechanical property tests are also carried out:

1. the emulsion component adopts an LH-4-2 formula, and the powder is prepared according to the following formula 2:

TABLE 2 powder ratio (kg)

Cement	Fine sand	Coarse sand	Water reducing agent	Expanding agent	Defoaming agent	HPMC	Polypropylene fiber	Water repellent
									350	400	250	1	3	2	1	3	1

The experimental data are shown in table 3 below:

TABLE 3 mechanical Property test results

The above data show that the adhesive strength is low, and an emulsion component for increasing the adhesive strength is required to be added.

2. The powder is prepared according to the table 2, the emulsion component adopts an LH-4-2 formula and is added with vinyl acetate-ethylene copolymer emulsion, and the emulsion proportion is changed into cation neoprene latex: vinyl acetate-ethylene copolymer emulsion: the formula number of the emulsion is changed to LH-9 when the ratio of water is 1:1: 2.

The data show that after the vinyl acetate-ethylene copolymer emulsion is added, the bonding strength with the base layer exceeds the requirement that the national standard is more than or equal to 1.2MPA, and the compressive and flexural strength is improved. Thus, the above tests show that an excellent emulsion formulation is obtained by blending a cationic polychloroprene latex with a vinyl acetate-ethylene copolymer emulsion, and the specific experimental data are shown in table 4 below:

TABLE 4 mechanical Property test results

Through the tests on the aspects of corrosion resistance, mechanical property and the like, the formula of the emulsion is finally determined as follows: 20-30% of cation neoprene emulsion, 20-30% of vinyl acetate-ethylene copolymer emulsion and the balance of drinking water, besides, the invention also further optimizes the powder formula.

The inventor finds that due to the limitation of the environmental conditions of a construction site, the mortar loses water too quickly to become a key factor of construction quality through continuous exploration, and particularly in vertical face construction, the maintenance difficulty is very high, and the improvement of the water retention rate is very key. HPMC is the mortar water-retaining agent, but the adding amount needs to be paid attention, if too much is added, the effect is not obvious, and the mortar viscosity is too high, so that the construction speed and the construction quality are influenced. In order not to influence the construction quality, the inventor adds a fiber which is a hollow fiber through continuous practice. The polypropylene fiber (pp fiber) contained in the mortar plays the effects of stress release during shrinkage and expansion and crack generation prevention, and after the hollow fiber is added, the former effect is not changed, and the natural maintenance effect is additionally increased. After the fiber is added, all problems are solved, and the 3mm plastering layer can not be maintained (except in a severe environment). The principle is as follows: in the process of adding water into the mortar and stirring, the hollow inside the hollow fiber is saturated with water, in the process of slowly losing water of the mortar, the water contained inside the fiber is released outwards to supplement the water content of the mortar, and the normal hydration reaction of the cement is ensured by matching with the water-retaining agent, so that the ideal effect of natural maintenance is achieved. Therefore, after 24-hour demoulding of a test block finished in a laboratory, the test block is directly placed at a direct sunlight irradiation position without maintenance procedures such as water spraying, film coating and the like, the shortest test block can be used for water absorption and freeze-thaw resistance test only seven days, and the effect is very obvious.

The thickness of local plastering needs to be more than 10mm, even reaches 30-50mm in the construction process, and when the thickness of the primary plastering of the polymer mortar is more than 10mm, the polymer mortar can slide down to cause cracks and even cracks. Therefore, for the construction of a thick plastering part, plastering needs to be carried out for many times, and the construction difficulty is increased. We try to add a new material of starch ether (DFM) into the mortar, so that the plastering slide and fall problem of the thick polymer anticorrosion mortar can be effectively controlled. After many comparison tests, the method is successful. The wall plastering thickness of the vertical face in the laboratory can reach 30mm once without slipping and falling.

After the shrinkage crack of the large-area polymer mortar plastering is solved, the applicant mentions an important parameter of a fracture ratio index according to a large amount of research and development experience, and in national standards and practical standards of polymer anticorrosive mortar, none of the applicant mentions the index, only two standards of JG149-2003 polymer overlay mortar and JG158-2004 polymer anti-cracking mortar relate to a mandatory index of the fracture ratio being less than or equal to 3, but no mandatory index of the compressive and flexural strength; through technical analysis, the two kinds of mortar belong to thin plastering mortar for external wall heat insulation, and the mortar is not damaged by external force when in use, so that no regulation is provided for the compression resistance and the bending resistance. However, in the case of polymer anticorrosive mortar, if the fracture ratio is too high, cracks are easily generated. If the folding ratio is not considered, the service life of the project is greatly reduced. After careful study GB50212-2014 and CECS 18: 2000, two national anti-corrosion mortar standards are found to have strong regulations on construction areas, GB50212-2014 prescribes that the construction width cannot be larger than 1.5m, and the whole block cannot be larger than 12 square meters; CECS 18: 2000, the construction width is not more than 1 meter, the whole block is not more than 10 square meters, and the construction is staggered in the manner of dividing the blocks into strips and blocks, so that the expansion and contraction stress is released, and the hollowing crack is avoided. However, after the concrete is practically applied to engineering, the appearance is greatly reduced after the construction surface is completely cut into small blocks, the construction difficulty is increased, and the construction cost is increased. In order to not influence the integrity and the aesthetic property of construction, not increase the construction difficulty and the construction cost and not reduce the compressive strength, the compression-fracture ratio is less than or equal to 3, and only the compressive strength is improved. Many trials were also made in this regard. The calculated national standard folding ratio is 6.7, the folding ratio of the anticorrosive mortar of the invention is 3.3, and the folding ratio index can effectively control the hollowing cracking of the polymer anticorrosive mortar plaster with the thickness, but the folding ratio can not be separated from the component selection and the specific proportioning relation among the components in order to control the folding ratio.

Specific test data on the fold-to-crush ratio are as follows:

1. the mortar powder comprises the following components: see table 5 below, emulsion component formulation: LH-9

TABLE 5 mortar powder formulation (kg)

Cement	Fine sand	Coarse sand	Water reducing agent	Expanding agent	Defoaming agent	HPMC	DFM	PP fiber	Hollow fiber	Water repellent
											350	400	250	2	8	2	0.5	1	0.5	0.5	1

The experimental data are shown in Table 6:

TABLE 6 test results

The above experimental crush ratio was 5.0. Currently, the bending ratio can only be adjusted by improving the bending strength. The materials that affect flexural strength are fibers and HPMC.

2. The mortar powder formulation is shown in table 7 below, with the emulsion component formulation unchanged.

TABLE 7 mortar powder formulation (kg)

Cement	Fine sand	Coarse sand	Water reducing agent	Expanding agent	Defoaming agent	HPMC	DFM	PP fiber	Hollow fiber	Water repellent
											350	400	250	1	3	1	3	2	3	2	2

The experimental data are as follows (table 8):

TABLE 8 test results

The above experimental crush ratio was 3.64. The mixing amount of the fiber and the HPMC can not be higher any more in the experimental process, and the compression strength is reduced by only reducing the compression-fracture ratio.

From the above test results, it can be found that the amount of each component is reasonably proportioned to obtain the optimal folding ratio.

After the optimized formula is subjected to an anti-freezing test, the powder formula is as shown in table 7, and the emulsion component formula is as follows: LH-9, the specific test results are: the surface is smooth and has no damage before freezing, no abnormality after freezing, and no obvious change compared with before freezing. And the average water absorption rate after freezing and thawing is 3%, the frozen quality is free from loss, the elastic modulus is not reduced, and after the test, the freezing and thawing resistance of the sample is more than or equal to 200 times, namely the formula disclosed by the invention is excellent in corrosion resistance and mechanical properties and also excellent in freezing and thawing resistance.

To further optimize the ratio between the components, preferably the powder comprises: the mortar comprises, by mass, 350 parts of cement, 450 parts of fine sand, 250 parts of coarse sand, 1.5 parts of a water reducing agent, 7 parts of an expanding agent, 1.2 parts of a defoaming agent, 2 parts of HPMC (hydroxy propyl methyl cellulose), 1.4 parts of starch ether, 1.2 parts of a water repellent, 2.5 parts of polypropylene fiber, 1.5 parts of hollow fiber and 40 parts of rubber powder.

Preferably, the emulsion comprises: the cationic neoprene emulsion is 25 percent, the vinyl acetate-ethylene copolymer emulsion is 25 percent, and the balance is drinking water.

The more excellent mass ratio of the powder to the emulsion is controlled to be 5: 1.

preferably, the thickness of the plastering is less than or equal to 15mm, the polypropylene fiber with the length of less than 6mm is used, the thickness of the plastering is more than or equal to 15mm, and the polypropylene fiber with the length of more than 12mm is used in a matching way;

in addition, methylcellulose (HPMC) is preferably chosen to have a viscosity of 20 ten thousand, which meets certain viscosity requirements.

The granularity of the coarse sand is below 1.5mm, and the mesh granularity of the fine sand is controlled to be 20-100 meshes.

Preferably, the length of the hollow fibers is controlled to be 6mm or less, preferably 6 mm.

The particular type of each component is preferably selected by constant trial as follows:

the type of cement is preferably type 425;

preferably, the water reducing agent is 530P polyacetic acid powder produced by Switzerland;

preferably, the defoamer is 770DD defoamer;

preferably, the bulking agent is a daily production CAS bulking agent;

preferably, the water repellent is SHP60 water repellent produced in the United states.

By controlling the types and the dosage of the components of the formula in a better range, the anticorrosive freeze-thaw resistant mortar has better performances in various aspects.

The invention provides an anticorrosive freeze-thaw resistant mortar and a preparation method thereof, and the preparation method specifically comprises the following steps:

and respectively preparing the powder and the emulsion, and then uniformly stirring and mixing the powder and the emulsion according to a certain proportion.

The addition is preferably carried out in the order of adding the emulsion first and then the powder to the emulsion.

Furthermore, the mixing and stirring speed is controlled at 200-300rpm, the mixing and stirring time is controlled at 1-5min, and in order to ensure that the mixing among the components is more uniform, the mixing mode is optimally carried out according to the following operations: mixing, stirring for 2-3min, standing for 1-2min, and stirring for 1-2 min.

Compared with the prior art, the invention has the beneficial effects that:

(1) the anticorrosive freeze-thaw resistant mortar is a novel high molecular polymer mortar, the powder material is a brand new cementing material which is formed by accurately mixing inorganic cementing material, graded sand, mineral filler and high molecular polymer auxiliary agent as raw materials according to a certain proportion in a dry state, and the product is gray, powdery, nontoxic and tasteless in an original state; the emulsion is a high-molecular polymerization emulsion, belongs to a green environment-friendly material, can well resist damage such as freeze thawing, polluted water damage and the like, has dual performances of corrosion resistance and freeze thawing resistance, has low subsequent maintenance cost, only needs simple spray maintenance for 2-3 days, has excellent mechanical properties and other mechanical properties, has all data far exceeding the relevant national standards, is not easy to crack, has good stability, and is worthy of wide popularization and application.

(2) The preparation method of the anti-corrosion freeze-thaw resistant mortar provided by the invention is simple and convenient to operate, the front step and the rear step are tightly connected, the operation condition is mild, three wastes are not generated, and the preparation method is green and environment-friendly.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

Examples 1 to 4

The formula of the emulsion is as follows: by mass percentage, 20 wt% of cationic neoprene latex, 20 wt% of vinyl acetate-ethylene copolymer emulsion and the balance of drinking water;

the powder formulation is as follows in table 9, and the specific preparation process is: mixing the powder and the emulsion according to the proportion of 4: 1 for 5min at a mass ratio of 300rpm to obtain a mortar product, wherein the coarse sand has a particle size of 1.5mm, the fine sand has a mesh size of 20-100 meshes, and the hollow fibers have a length of 6 mm.

TABLE 9 mortar powder formulation (kg)

Group of	Cement	Fine sand	Coarse sand	Water reducing agent	Expanding agent	Defoaming agent	HPMC	DFM	PP fiber	Hollow fiber	Water repellent	Rubber powder
													Example 1	350	400	250	1	3	1	3	2	3	2	2	30
Example 2	300	500	100	2	8	2	2	1.4	1	1.5	1	50
													Example 3	400	450	300	1.6	6	1.5	1	1.5	1.5	1	1.5	40
Example 4	320	420	260	1.5	7	1.2	1.5	1	2.5	1.8	1.2	35

Example 5

The specific formulation and preparation process are the same as those in example 4, except that the length of the PP fiber is 1kg below 6mm, and the length of the rest PP fibers is 12 mm.

Example 6

The specific formulation and preparation process were the same as in example 4 except that the grit of the coarse sand was 1.2mm, the grit of the fine sand was 40-60 mesh, and the length of the hollow fiber was 5 mm. The PP fiber had a length of 1.5kg or less at 5mm, and the remainder had a length of 13 mm.

Example 7

The specific formulation and preparation process were the same as in example 5 except that the emulsion formulation was: by mass percentage, 30 wt% of cationic neoprene latex, 30 wt% of vinyl acetate-ethylene copolymer emulsion and the balance of drinking water.

Example 8

The specific formulation and preparation process were the same as in example 5 except that the emulsion formulation was: by mass percent, 25 wt% of cationic neoprene latex, 25 wt% of vinyl acetate-ethylene copolymer emulsion and the balance of drinking water, wherein the powder formula is as follows:

TABLE 10 mortar powder formulation (kg)

Group of	Cement	Fine sand	Coarse sand	Water reducing agent	Expanding agent	Defoaming agent	HPMC	DFM	PP fiber	Hollow fiber	Water repellent	Rubber powder
													Example 1	350	450	250	1.5	7	1.2	2	1.4	2.5	1.5	1.2	40

The specific preparation process comprises the following steps: mixing the powder and the emulsion according to the ratio of 6: 1, mixing and stirring for 2min at the mass ratio of 200rpm, standing for 1min, and stirring for 1min to obtain the mortar product.

Example 9

The specific formula and the preparation process are the same as those in example 8, except that the specific preparation process is as follows: mixing the powder and the emulsion according to the proportion of 5: 1 at the mass ratio of 250rpm for 3min, standing for 2min, and stirring for 2min to obtain the mortar product.

Example 10

The specific formula and the preparation process are the same as those in example 8, except that the specific preparation process is as follows: adding the emulsion firstly, then adding the powder, and mixing the powder and the emulsion according to the ratio of 5: 1 at the mass ratio of 250rpm for 3min, standing for 2min, and stirring for 2min to obtain the mortar product.

The specific types and brands of the components of examples 5-10 above are shown in tables 11-12 below:

TABLE 11 powder compositions

TABLE 12 emulsion Components

Serial number	Name of Material	Model number	Brand	Producing area	Remarks for note
						1	Cationic neoprene emulsion	Cation(s)	Fenyang hall	Hunan province
2	Vinyl acetate-ethylene copolymer emulsion	707	Ornamental columns	Beijing
						3	Water (W)				Drinking water

When the mortar of the above embodiments is used, it may be too sticky due to environmental climate, and the amount of the powder component added can be reduced appropriately. Or water can be added according to 5-10% of the emulsion amount, and the water addition amount can never exceed 10% of the emulsion.

Experimental example 1

The mortar of the above examples 1 to 10 was subjected to various tests of properties, and the specific test results are shown in the following table 13:

TABLE 13 results of Performance testing

The test results also show that the mortar of the invention has excellent performances in all aspects, and all data far exceed national standards.

While particular embodiments of the present invention have been illustrated and described, it would be obvious that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.

Claims

1. The anti-corrosion and freeze-thaw resistant mortar is characterized by mainly comprising powder and emulsion in a mass ratio of (4-6): 1, the powder comprises: by mass, 400 parts of cement 300-;

2. The anti-corrosive freeze-thaw resistant mortar according to claim 1, wherein the dust comprises: the mortar comprises, by mass, 350 parts of cement, 450 parts of fine sand, 250 parts of coarse sand, 1.5 parts of a water reducing agent, 7 parts of an expanding agent, 1.2 parts of a defoaming agent, 2 parts of HPMC (hydroxy propyl methyl cellulose), 1.4 parts of starch ether, 1.2 parts of a water repellent, 2.5 parts of polypropylene fiber, 1.5 parts of hollow fiber and 40 parts of rubber powder.

3. The anti-corrosion and freeze-thaw resistant mortar according to claim 2, wherein polypropylene fibers with a plastering thickness of less than or equal to 15mm and a length of less than 6mm are used, and polypropylene fibers with a plastering thickness of more than or equal to 15mm and a length of more than 12mm are used in combination.

4. The preservative, freeze-thaw resistant mortar according to claim 2, wherein the HPMC has a viscosity of 20 ten thousand.

5. The anti-corrosion and freeze-thaw resistant mortar according to claim 2, wherein the coarse sand has a particle size of 1.5mm or less, and the fine sand has a particle size controlled to 20-100 mesh.

6. The anti-corrosion freeze-thaw resistant mortar according to claim 2, wherein the length of the hollow fiber is controlled to be 6mm or less.

7. The anti-corrosive freeze-thaw resistant mortar according to claim 2, wherein the hollow fibers have a length of 6 mm.

8. The anti-corrosive freeze-thaw resistant mortar according to claim 1, wherein the emulsion comprises: the cationic neoprene emulsion is 25 percent, the vinyl acetate-ethylene copolymer emulsion is 25 percent, and the balance is drinking water.

9. The anti-corrosive freeze-thaw resistant mortar according to any one of claims 1 to 8, wherein the mass ratio of the powder to the emulsion is controlled to be 5: 1.

10. an anti-corrosive freeze-thaw resistant mortar according to any one of claims 1 to 8, wherein the type of cement is type 425.

11. The anti-corrosive freeze-thaw resistant mortar according to any one of claims 1 to 8, wherein the water reducing agent is 530P polyacetic acid powder produced by Switzerland.

12. The anti-corrosive freeze-thaw resistant mortar according to any one of claims 1 to 8, wherein the defoamer is 770DD defoamer.

13. The anti-corrosive freeze-thaw resistant mortar according to any one of claims 1 to 8, wherein the swelling agent is a daily production CAS swelling agent.

14. The anti-corrosive freeze-thaw resistant mortar according to any one of claims 1 to 8, wherein the water repellent is SHP60 water repellent produced in the United states.

15. A method for preparing an anti-corrosive freeze-thaw resistant mortar according to any one of claims 1 to 14, comprising the steps of:

16. The method for preparing the anti-corrosive freeze-thaw resistant mortar according to claim 15, wherein the emulsion is added first and then the powder is added.

17. The method as claimed in claim 15, wherein the mixing and stirring speed is controlled at 200-300rpm, and the mixing and stirring time is controlled at 1-5 min.

18. The method of claim 17, wherein the mixing and stirring are performed for 2-3min, the mixture is left standing for 1-2min, and then the stirring is performed for 1-2 min.