CN110483000B - Interface agent for repairing masonry structure and preparation method and application thereof - Google Patents
Interface agent for repairing masonry structure and preparation method and application thereof Download PDFInfo
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- CN110483000B CN110483000B CN201910894099.7A CN201910894099A CN110483000B CN 110483000 B CN110483000 B CN 110483000B CN 201910894099 A CN201910894099 A CN 201910894099A CN 110483000 B CN110483000 B CN 110483000B
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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
- C04B28/34—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 cold phosphate binders
- C04B28/344—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 cold phosphate binders the phosphate binder being present in the starting composition solely as one or more phosphates
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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
- 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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Abstract
The invention relates to the technical field of masonry structure repair, in particular to an interface agent for repairing a masonry structure and a preparation method and application thereof. The raw materials of the interfacial agent comprise the following components: 30-60 parts of magnesium phosphate cement, 10-30 parts of sulphoaluminate cement, 10-30 parts of metakaolin, 3-8 parts of butylbenzene emulsion, 0.5-1.5 parts of polyvinyl alcohol rubber powder and 0.1-0.4 part of defoaming agent. According to the invention, the magnesium phosphate cement, the metakaolin, the sulphoaluminate cement, the styrene-butadiene emulsion, the polyvinyl alcohol rubber powder, the water and other raw materials are mixed, the obtained interface agent has good waterproof and anti-permeability performance and high bonding strength, and the problems that the bonding strength of the repair mortar and a masonry structure is low, and the whole block or large-area peeling is easy to generate and the like can be well solved.
Description
Technical Field
The invention relates to the technical field of masonry structure repair, in particular to an interface agent for repairing a masonry structure and a preparation method and application thereof.
Background
The information disclosed in this background of the invention is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
For the common method for repairing the damaged masonry structure, the method of replacing and reinforcing mortar is often adopted in the engineering for treatment. However, the inventor researches and discovers that: in the actual repair engineering, due to reasons such as weather drying, a building block forming process and the like, the water absorption rate of the surface of the masonry structure is high, and the problems that the repair mortar on the surface of the masonry structure cracks, loosens and even falls off due to the fact that moisture is absorbed by the building block are caused.
Currently, the above problems can be overcome by applying an interfacial agent between the masonry structure and the repair mortar. Masonry structures generally refer to vertical walls built from bricks or blocks in a building, and often a layer of facing and plastering mortar is also coated on the surface. However, as the service time increases, the layer of mortar on the surface of the structure is easy to fall off, and the like, and further, the inventor researches and discovers that: the problem is mainly caused by two reasons, namely, the wall surface is too dry to absorb the moisture in the mortar too quickly; secondly, the surface mortar falls off due to the fact that the wall body is affected with damp. Whether the wall is too dry or damp, the mortar falls off due to water exchange between the wall and the mortar.
Disclosure of Invention
The technical problem to be solved/realized by the invention is that: the problems that the bonding strength between repair mortar and a masonry structure is low, and the whole block or large-area peeling is easy to generate exist, and the like, but the existing interface agent is not suitable for the later-stage repair of the masonry structure, and the interface agent is required to have the characteristics of water resistance, impermeability and high bonding strength due to the particularity of the repair of the masonry structure; therefore, the invention provides an interface agent for repairing a masonry structure, and a preparation method and application thereof. Compared with the common emulsion type interface agent on the market, the interface agent has the advantages of high condensation speed, high bonding strength, good water resistance and the like. And the interface agent is convenient to store, can be used after being uniformly stirred, and does not have the phenomenon that the emulsion type interface agent is layered due to long-time placement.
In order to realize the purpose, the invention discloses the following technical scheme:
an interface agent for repairing masonry structure, which comprises the following components: 30-60 parts of magnesium phosphate cement, 10-30 parts of sulphoaluminate cement, 10-30 parts of metakaolin, 3-8 parts of butylbenzene emulsion, 0.5-1.5 parts of polyvinyl alcohol rubber powder and 0.1-0.4 part of defoaming agent.
The interface agent provided by the invention takes magnesium phosphate cement and sulphoaluminate cement as main repairing materials, improves shrinkage and viscosity by introducing metakaolin, and enhances the working performance of the repairing mortar; the pore diameter of the system is reduced by introducing the styrene-butadiene emulsion, the polyvinyl alcohol rubber powder and the tributyl phosphate, the compactness is improved, and the waterproof and anti-permeability performance of the repair mortar is enhanced.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention mixes the raw materials of magnesium phosphate cement, metakaolin, sulphoaluminate cement, butylbenzene emulsion, polyvinyl alcohol rubber powder, water and the like, and can well solve the problems that the bonding strength of the repair mortar and a masonry structure is low, and the whole block or large-area peeling is easy to generate and the like.
(2) The interface agent obtained by the invention has good waterproof and anti-permeability performance and high bonding strength.
(3) The material is simple to prepare, only raw materials are required to be mixed in advance and uniformly mixed, the construction is convenient, the energy is saved, the environment is protected, and the satisfactory effect can be achieved by utilizing the performance of the material.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms also are intended to include the plural forms as well, unless the context clearly indicates otherwise, and it should be further understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, devices, components, and/or combinations thereof.
As mentioned above, the present invention provides a method for repairing masonry structure surface, which is suitable for the problems of low bonding strength between the repair mortar and the masonry structure, easy generation of monoblock or large-area peeling, etc.
In some exemplary embodiments, the interfacial agent further comprises water, which is added in a ratio of 15 to 25 parts by weight. Water is mainly used for cement hydration and polymer film formation.
In some typical embodiments, the magnesium phosphate cement is prepared from dead-burned magnesium oxide, ammonium dihydrogen phosphate and borax in a mass ratio of 2-3.5:1: 0.2-0.4.
The interface agent takes magnesium phosphate cement and sulphoaluminate cement as main components; the magnesium phosphate cement and the sulphoaluminate cement have the advantages of setting and hardening blocks, high early strength and the like, and are very suitable for repair engineering. Meanwhile, the sulphoaluminate cement particles have a certain filling effect in a magnesium phosphate cement system, so that the overall early strength is higher, and the compactness is improved because the unhydrated sulphoaluminate cement particles are filled in gaps of a hardened magnesium phosphate cement matrix. And with the increase of the age, the sulphoaluminate cement particles are continuously hydrated, and hydration products are continuously generated and filled in pores of a system, so that the density improving effect is more remarkable. Therefore, the proper amount of sulphoaluminate cement is introduced into the magnesium phosphate cement system, so that the overall strength of the system can be improved, and great help is brought to the improvement of engineering quality.
In some typical embodiments, the styrene-butadiene emulsion has a solids content of 50 ± 1%; the polyvinyl alcohol rubber powder is cold-soluble rubber powder. The two polymers of the styrene-butadiene emulsion and the polyvinyl alcohol rubber powder can form a uniformly distributed three-dimensional network structure while cement is hydrated, so that a cement framework structure is reinforced, and the mechanical property of the mortar is improved.
In some typical embodiments, the defoamer is tributyl phosphate. The tributyl phosphate has high defoaming stability speed, long defoaming time and small addition amount, and the product performance is not influenced; in addition, the interface agent of the invention uses polyvinyl alcohol rubber powder, so that the viscosity of the slurry is improved, the fluidity is reduced, and tributyl phosphate can be defoamed, and meanwhile, the fluidity of the slurry can be improved, and the construction is convenient. In addition, although the styrene-butadiene emulsion and the polyvinyl alcohol rubber powder can effectively improve the mechanical property of the mortar, the two substances have air-entraining property, so that a large number of harmful air holes in the system can be increased in the stirring process, and the harmful air holes can be greatly reduced by adding tributyl phosphate, so that the density of the system is improved.
In the present invention, the reason why metakaolin is introduced is: the component has the micro-expansion property of compensating shrinkage and the filling effect, and simultaneously, the viscosity of the system is increased due to the large specific surface area and high water absorption.
In some exemplary embodiments, the interfacial agent comprises the following components in parts by weight: 40-50 parts of magnesium phosphate cement, 15-25 parts of sulphoaluminate cement, 15-20 parts of metakaolin, 5-8 parts of butylbenzene emulsion, 1.0-1.5 parts of polyvinyl alcohol rubber powder, 0.2-0.3 part of defoaming agent and 15-24 parts of water. Tests show that when the components in the range are adopted, the obtained interface agent has better repairing performance on the masonry structure.
In some exemplary embodiments, the interfacial agent is prepared by a method comprising the steps of: firstly, according to the formula and proportion of the magnesium phosphate cement, stirring and mixing the raw materials uniformly; then uniformly mixing the powder materials such as cement, metakaolin, rubber powder and the like; finally, adding the butylbenzene emulsion and water, stirring and mixing uniformly to obtain the product.
It should be noted that the interface agent of the present invention needs to be used along with the formulation; when the interface agent is used for repairing the masonry structure, the masonry structure is washed clean by water, the stirred interface agent is evenly and flatly coated on the surface of the structure, and after the interface agent is solidified and hardened, the repair mortar is evenly and flatly coated on the interface agent.
In some typical embodiments, the repair mortar is polyvinyl alcohol modified sulphoaluminate cement mortar, which is prepared by compounding sulphoaluminate cement, polyvinyl alcohol glue powder, an antifoaming agent, a polycarboxylic acid water reducing agent, a retarder, river sand and water, wherein the polyvinyl alcohol glue powder accounts for 0.5-1.5% of the weight of the sulphoaluminate cement, the antifoaming agent accounts for 0.15-0.35% of the weight of the sulphoaluminate cement, the polycarboxylic acid water reducing agent accounts for 0.25-0.4% of the weight of the sulphoaluminate cement, the retarder accounts for 0.08-0.15% of the weight of the sulphoaluminate cement, the water accounts for 45-55% of the weight of the sulphoaluminate cement, and the river sand accounts for 2.8-3.3 times of the weight of the sulphoaluminate cement, and has a particle size of less than 4.75 mm. The interface agent and the repair mortar are sulphoaluminate cement-based materials, so that the interface bonding force between the interface agent and the mortar can be enhanced, and the repair effect is improved.
In some typical embodiments, the thickness of the interface agent is controlled to be between 1.5 and 2.5 mm.
In some exemplary embodiments, the interface agent of the present invention is also used in the construction field, such as repairing various types of suitable damaged building walls.
The invention will now be further described with reference to specific embodiments.
In the following examples, the masonry structure is red brick. The dead-burned magnesia is prepared from magnesite (MgCO)3) Calcining at over 1600 deg.C, crushing, and grinding. The purity of the adopted ammonium dihydrogen phosphate is more than or equal to 99.5 percent; the borax is used in industrial export grade, and the content is more than or equal to 99 percent. The adopted sulphoaluminate cement is 42.5-grade quick hardening sulphoaluminate cement. The solid content of the butylbenzene emulsion is 50 +/-1%; the adopted polyvinyl alcohol rubber powder is polyvinyl alcohol 0588 rubber powder. The adopted antifoaming agent is tributyl phosphate, the adopted sulphoaluminate cement is 42.5-grade quick-hardening sulphoaluminate cement, and the retarder is citric acid.
Example 1
An interface agent suitable for repairing a masonry structure comprises the following components in percentage by mass: 40 parts of magnesium phosphate cement, 15 parts of sulphoaluminate cement, 15 parts of metakaolin, 5 parts of styrene-butadiene emulsion, 1.0 part of polyvinyl alcohol rubber powder, 0.2 part of tributyl phosphate and 24 parts of water.
The preparation method of the interfacial agent in the embodiment comprises the following steps: weighing magnesium phosphate cement, preparing according to a formula (weight ratio of dead-burned magnesium oxide to ammonium dihydrogen phosphate to borax is 3:1: 0.3), placing in a mixer, stirring for 30min, and mixing uniformly; and weighing the raw materials according to the formula, adding the raw materials into a mixer, stirring for 30min, and uniformly mixing to obtain the interface agent slurry.
Then, the interfacial agent slurry prepared in this example is used to repair the washed masonry structure: firstly, washing a masonry structure repair base surface by tap water to enable the surface layer to reach a saturated and clear water-free state; then uniformly and flatly coating the uniformly stirred interfacial agent on the wash-up surface, wherein the thickness of the interfacial agent is about 2 mm; after the interface agent is solidified and hardened, the repair mortar is evenly and flatly coated on the interface agent, and the thickness of the repair mortar is about 10 mm. The repair mortar is polyvinyl alcohol modified sulphoaluminate cement mortar, which is prepared by compounding sulphoaluminate cement, polyvinyl alcohol rubber powder, an antifoaming agent, a polycarboxylic acid water reducing agent, a retarder, river sand and water, wherein the polyvinyl alcohol rubber powder accounts for 1.0% of the weight of the sulphoaluminate cement, the antifoaming agent accounts for 0.15% of the weight of the sulphoaluminate cement, the polycarboxylic acid water reducing agent accounts for 0.4% of the weight of the sulphoaluminate cement, the retarder accounts for 0.1% of the weight of the sulphoaluminate cement, the water accounts for 55% of the weight of the sulphoaluminate cement, the river sand accounts for 3 times of the weight of the sulphoaluminate cement, and the granularity is less than 4.75 mm.
And after the repairing construction is finished and the natural moisture curing is carried out, testing the bonding tensile strength between the masonry structure and the repairing layer.
Example 2
An interface agent suitable for repairing a masonry structure comprises the following components in percentage by mass: 50 parts of magnesium phosphate cement, 25 parts of sulphoaluminate cement, 20 parts of metakaolin, 8 parts of styrene-butadiene emulsion, 1.5 parts of polyvinyl alcohol rubber powder, 0.3 part of tributyl phosphate and 15 parts of water.
The preparation method of the interfacial agent in the embodiment comprises the following steps: weighing magnesium phosphate cement, preparing according to a formula (weight ratio of dead-burned magnesium oxide to ammonium dihydrogen phosphate to borax is 2:1: 0.2), placing in a mixer, stirring for 30min, and mixing uniformly; and weighing the raw materials according to the formula, adding the raw materials into a mixer, stirring for 30min, and uniformly mixing to obtain the interface agent slurry.
Then, the interfacial agent slurry prepared in this example is used to repair the washed masonry structure: firstly, washing a masonry structure repair base surface by tap water to enable the surface layer to reach a saturated and clear water-free state; then uniformly and flatly coating the uniformly stirred interfacial agent on the wash-up surface, wherein the thickness of the interfacial agent is about 2.5 mm; after the interface agent is solidified and hardened, the repair mortar is evenly and flatly coated on the interface agent, and the thickness of the repair mortar is about 11 mm. The repair mortar is polyvinyl alcohol modified sulphoaluminate cement mortar, which is prepared by compounding sulphoaluminate cement, polyvinyl alcohol rubber powder, an antifoaming agent, a polycarboxylic acid water reducing agent, a retarder, river sand and water, wherein the polyvinyl alcohol rubber powder accounts for 1.5% of the weight of the sulphoaluminate cement, the antifoaming agent accounts for 0.35% of the weight of the sulphoaluminate cement, the polycarboxylic acid water reducing agent accounts for 0.35% of the weight of the sulphoaluminate cement, the retarder accounts for 0.15% of the weight of the sulphoaluminate cement, the water accounts for 50% of the weight of the sulphoaluminate cement, the river sand accounts for 2.8 times of the weight of the sulphoaluminate cement, and the granularity is less than 4.75 mm.
And after the repairing construction is finished and the natural moisture curing is carried out, testing the bonding tensile strength between the masonry structure and the repairing layer.
Example 3
An interface agent suitable for repairing a masonry structure comprises the following components in percentage by mass: 30 parts of magnesium phosphate cement, 10 parts of sulphoaluminate cement, 10 parts of metakaolin, 5 parts of styrene-butadiene emulsion, 1.2 parts of polyvinyl alcohol rubber powder, 0.1 part of tributyl phosphate and 25 parts of water.
The preparation method of the interfacial agent in the embodiment comprises the following steps: weighing magnesium phosphate cement, preparing according to a formula (weight ratio of dead-burned magnesium oxide to ammonium dihydrogen phosphate to borax is 3.5:1: 0.4), placing in a mixer, stirring for 30min, and mixing uniformly; and weighing the raw materials according to the formula, sequentially adding the raw materials into a mixer, stirring for 30min, and uniformly mixing to obtain the interface agent slurry.
Then, the interfacial agent slurry prepared in this example is used to repair the washed masonry structure: firstly, washing a masonry structure repair base surface by tap water to enable the surface layer to reach a saturated and clear water-free state; then uniformly and flatly coating the uniformly stirred interfacial agent on the wash-up surface, wherein the thickness of the interfacial agent is about 2.2 mm; after the interface agent is solidified and hardened, the repair mortar is evenly and flatly coated on the interface agent, and the thickness of the repair mortar is about 8 mm. The repair mortar is polyvinyl alcohol modified sulphoaluminate cement mortar, which is prepared by compounding sulphoaluminate cement, polyvinyl alcohol rubber powder, an antifoaming agent, a polycarboxylic acid water reducing agent, a retarder, river sand and water, wherein the polyvinyl alcohol rubber powder accounts for 1.5% of the weight of the sulphoaluminate cement, the antifoaming agent accounts for 0.2% of the weight of the sulphoaluminate cement, the polycarboxylic acid water reducing agent accounts for 0.25% of the weight of the sulphoaluminate cement, the retarder accounts for 0.08% of the weight of the sulphoaluminate cement, the water accounts for 55% of the weight of the sulphoaluminate cement, the river sand accounts for 3.3 times of the weight of the sulphoaluminate cement, and the granularity is less than 4.75 mm.
And after the repairing construction is finished and the natural moisture curing is carried out, testing the bonding tensile strength between the masonry structure and the repairing layer.
Example 4
An interface agent suitable for repairing a masonry structure comprises the following components in percentage by mass: 60 parts of magnesium phosphate cement, 30 parts of sulphoaluminate cement, 30 parts of metakaolin, 3 parts of styrene-butadiene emulsion, 0.5 part of polyvinyl alcohol rubber powder, 0.4 part of tributyl phosphate and 22 parts of water.
The preparation method of the interfacial agent in the embodiment comprises the following steps: weighing magnesium phosphate cement, preparing according to a formula (weight ratio of dead-burned magnesium oxide to ammonium dihydrogen phosphate to borax is 2.5:1: 0.3), placing in a mixer, stirring for 30min, and mixing uniformly; and weighing the raw materials according to the formula, sequentially adding the raw materials into a mixer, stirring for 30min, and uniformly mixing to obtain the interface agent slurry.
Then, the interfacial agent slurry prepared in this example is used to repair the washed masonry structure: firstly, washing a masonry structure repair base surface by tap water to enable the surface layer to reach a saturated and clear water-free state; then uniformly and flatly coating the uniformly stirred interfacial agent on the wash-up surface, wherein the thickness of the interfacial agent is about 1.8 mm; after the interface agent is solidified and hardened, the repair mortar (polyvinyl alcohol modified sulphoaluminate cement mortar) is evenly and flatly coated on the interface agent, and the thickness of the repair mortar is about 10 mm. And after the repairing construction is finished and the natural moisture curing is carried out, testing the bonding tensile strength between the masonry structure and the repairing layer.
Test example 1
An interface agent suitable for repairing masonry structure and a preparation method thereof are the same as example 1, except that: the components of the interface agent do not contain sulphoaluminate cement so as to detect the influence of the sulphoaluminate cement on the performance of the interface agent.
Test example 2
An interface agent suitable for repairing masonry structure and a preparation method thereof are the same as example 1, except that: the interface agent component does not contain metakaolin, so that the influence of the metakaolin on the performance of the interface agent is detected.
Test example 3
An interface agent suitable for repairing masonry structure and a preparation method thereof are the same as example 1, except that: the components of the interface agent do not contain styrene-butadiene emulsion and polyvinyl alcohol rubber powder so as to detect the influence of the two polymers on the performance of the interface agent.
Test example 4
An interface agent suitable for repairing masonry structure and a preparation method thereof are the same as example 1, except that: the components of the interface agent do not contain tributyl phosphate so as to detect the influence of the defoaming agent on the performance of the interface agent.
Test example 5
A method of repairing a masonry structure: firstly, washing a masonry structure base surface by using tap water; then evenly and flatly coating the repair mortar (polyvinyl alcohol modified sulphoaluminate cement mortar) on the base surface, wherein the thickness of the repair mortar is about 10 mm; so as to detect the repairing effect of the traditional repairing method without using the interface agent of the invention.
Performance testing
Tensile strength (early strength (3d) and late strength (14d)) tests were conducted on samples repaired by the methods of examples 1-4 and test examples 1-5 to examine the bonding between the repaired layer and the repair infrastructure, according to DL/T5126-2001 Polymer modified Cement mortar test protocol, the results of which are shown in tables 1 and 2.
TABLE 1 (Unit: MPa)
| Example 1 | Example 2 | Example 3 | Example 4 | |
| Early strength | 1.83 | 1.91 | 1.63 | 1.69 |
| Late strength | 2.61 | 2.77 | 2.42 | 2.35 |
TABLE 2 (Unit: MPa)
| Test example 1 | Test example 2 | Test example 3 | Test example 4 | Test example 5 | |
| Early strength | 1.13 | 1.39 | 1.31 | 1.04 | 0.75 |
| Late strength | 1.98 | 2.16 | 2.07 | 1.67 | 1.2 |
According to the detection results in tables 1 and 2, it can be seen from comparison between example 1 and test example 5 that, compared with the conventional repairing method, when the interfacial agent of the present invention is used, the bonding force between the repairing layer and the repairing base layer structure is significantly improved. Similarly, the detection results of the experimental examples 1 to 4 show that the introduction of metakaolin, sulphoaluminate cement, styrene-butadiene emulsion and polyvinyl alcohol rubber powder plays a good role in improving the repairing effect; for example, the styrene-butadiene emulsion and the polyvinyl alcohol rubber powder can form a uniformly distributed three-dimensional network structure while cement is hydrated, so that the cement framework structure is reinforced, and the mechanical property of the mortar is improved. Metakaolin has the micro-expansion property of compensating shrinkage and filling effect, and can improve the viscosity rise of a system. The sulphoaluminate cement can be hydrated continuously along with the increase of the age, and the overall density and strength of the system are improved.
In addition, after the test is finished, the damage condition of the surface layer of the repair base layer structure cured for 14 days (later strength) in the example 1 and the experimental example 5 is observed, and the surface layer of the repair base layer structure in the example 1 is seriously damaged, and the whole surface layer is almost adhered and peeled off, which indicates that the combination between the repair layer and the repair base layer structure is very firm; however, the repair base structure of experimental example 5 was only partially damaged and only a part of the surface layer was adhered, which indicates that the bonding between the repair layer and the repair base structure was not satisfactory.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
1. A method for using an interfacial agent for repairing a masonry structure,
firstly, according to the formula and proportion of the magnesium phosphate cement, stirring and mixing the raw materials uniformly; then, the rest raw materials and the magnesium phosphate cement are stirred and mixed uniformly according to the proportion to obtain interface agent slurry;
washing the masonry structure with water, smearing the interface agent slurry on the surface of the structure, and smearing the repair mortar on the interface agent uniformly and flatly after the interface agent is solidified and hardened;
the interface agent comprises the following components in parts by weight: 30-60 parts of magnesium phosphate cement, 10-30 parts of sulphoaluminate cement, 10-30 parts of metakaolin, 3-8 parts of butylbenzene emulsion, 0.5-1.5 parts of polyvinyl alcohol rubber powder, 0.1-0.4 part of defoaming agent and 15-25 parts of water;
the defoaming agent is tributyl phosphate;
the repair mortar is polyvinyl alcohol modified sulphoaluminate cement mortar, which is prepared by compounding sulphoaluminate cement, polyvinyl alcohol glue powder, an antifoaming agent, a polycarboxylic acid water reducing agent, a retarder, river sand and water, wherein the polyvinyl alcohol glue powder accounts for 0.5-1.5% of the sulphoaluminate cement in mass, the antifoaming agent accounts for 0.15-0.35% of the sulphoaluminate cement in mass, the polycarboxylic acid water reducing agent accounts for 0.25-0.4% of the sulphoaluminate cement in mass, the retarder accounts for 0.08-0.15% of the sulphoaluminate cement in mass, the water accounts for 45-55% of the sulphoaluminate cement in mass, the river sand accounts for 2.8-3.3 times of the sulphoaluminate cement in mass, and the granularity of the river sand is less than 4.75 mm.
2. The method of using the interfacial agent for repairing a masonry structure according to claim 1, wherein the interfacial agent is composed of the following components in parts by weight: 40-50 parts of magnesium phosphate cement, 15-25 parts of sulphoaluminate cement, 15-20 parts of metakaolin, 5-8 parts of butylbenzene emulsion, 1.0-1.5 parts of polyvinyl alcohol rubber powder, 0.2-0.3 part of defoaming agent and 15-24 parts of water.
3. The method of claim 1, wherein the magnesium phosphate cement is prepared from dead burned magnesium oxide, ammonium dihydrogen phosphate and borax in a mass ratio of 2-3.5:1: 0.2-0.4.
4. The method as claimed in claim 3, wherein the dead burned magnesia is prepared from magnesite through calcining at 1600 ℃ or more, crushing, and grinding.
5. The method of claim 3, wherein the purity of the ammonium dihydrogen phosphate is 99.5% or more.
6. The method of claim 3, wherein the borax is industrial export grade and has a content of 99% or more.
7. The method of using an interfacial agent for repairing a masonry structure according to claim 1, wherein said sulfoaluminate cement is a rapid hardening sulfoaluminate cement.
8. The method of using an interfacial agent for repairing a masonry structure according to claim 7, wherein said sulphoaluminate cement is a 42.5 grade rapid hardening sulphoaluminate cement.
9. The method of claim 1, wherein the butylbenzene emulsion has a solid content of 50 ± 1%; the polyvinyl alcohol rubber powder is cold-soluble rubber powder.
10. The method of using an interfacial agent for repairing a masonry structure according to any one of claims 1 to 9, wherein the interfacial agent is prepared by a method comprising: firstly, according to the formula of the magnesium phosphate cement, namely the proportion, stirring and mixing the raw materials uniformly; and then the rest raw materials and the magnesium phosphate cement are stirred and mixed uniformly according to the proportion to obtain the magnesium phosphate cement.
11. The method of claim 10, wherein the interfacial agent is applied at any time.
12. The method as claimed in claim 1, wherein the interfacial agent is applied to a thickness of 1.5-2.5 mm.
13. Use of an interfacial agent for repairing a masonry structure according to any one of claims 1 to 12 in the construction field.
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| CN112110703A (en) * | 2020-08-17 | 2020-12-22 | 济南大学 | Waterproof and impervious repair mortar and construction method and application thereof |
| CN113913036A (en) * | 2021-10-29 | 2022-01-11 | 重庆交通大学 | Concrete durable coating applied to cold region and high ultraviolet radiation region |
| CN117229699B (en) * | 2023-09-04 | 2024-04-30 | 广州市铁汉春园林景观工程有限公司 | Aging-resistant interface agent and preparation method thereof |
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