CN114773025A - Building damage repairing material, preparation method and repairing method thereof - Google Patents

Building damage repairing material, preparation method and repairing method thereof Download PDF

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Publication number
CN114773025A
CN114773025A CN202210451772.1A CN202210451772A CN114773025A CN 114773025 A CN114773025 A CN 114773025A CN 202210451772 A CN202210451772 A CN 202210451772A CN 114773025 A CN114773025 A CN 114773025A
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building
damage
repaired
repairing
sand
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Inventor
魏厚振
刘昊
孟庆山
王磊
许睿
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Wuhan Institute of Rock and Soil Mechanics of CAS
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Wuhan Institute of Rock and Soil Mechanics of CAS
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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
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0203—Arrangements for filling cracks or cavities in building constructions
    • E04G23/0211—Arrangements for filling cracks or cavities in building constructions using injection
    • 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
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/20—Retarders
    • C04B2103/22—Set retarders
    • 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)
  • Architecture (AREA)
  • Ceramic Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Working Measures On Existing Buildindgs (AREA)

Abstract

The invention discloses a building damage repairing material, a preparation method and a repairing method thereof, belonging to the technical field of civil engineering materials. The building damage repair material comprises the following components in parts by weight: the content of dead burned magnesium oxide: 26-40; mixing amount of potassium dihydrogen phosphate: 13-23; mixing amount of the composite retarder: 2-4; aggregate mixing amount: 28-45 parts of; blending amount of blending water: 8-14; the aggregate is coral sand or land-source sand taken from coral island reef areas, and the particle size of the aggregate is adjusted according to the size of a damage crack of a building to be repaired. The building damage repairing material can be prepared by applying the preparation method. The building damage repairing material can be used for repairing building damage. The method can be used for repairing the damaged building and structure in the severe coral island reef environment, so that the service life of the building and structure is prolonged.

Description

Building damage repairing material, preparation method and repairing method thereof
Technical Field
The invention relates to the technical field of civil engineering materials, in particular to a building damage repairing material, a preparation method and a repairing method thereof.
Background
The coral island reef is mainly distributed in tropical sea areas between 30 degrees of south latitude and north latitude and is in a complex environment with high temperature, high humidity and high salt all the year round, so that large-area cracking, peeling, erosion, collapse and other diseases are difficultly caused in buildings and structures serving on the coral island reef for many years. Aiming at the problem that the coral island reef is seriously damaged after the coral island reef is built and the coral island structure is in service for many years, in order to prolong the service life of the building and the coral island reef, the damaged building and the damaged coral island structure need to be repaired. However, due to special environments such as tides and ocean waves, the setting time of the repair material should be fully considered for repairing damaged positions of structures such as the breakwater, the breakwater protection slope and the like, and the influence of the tides and the ocean waves on the performance of the repair material is reduced as much as possible. In addition, since the coral island is far away from the continent, the land-source sand and stone materials must be transported by means of a long distance from the continent, and the transportation cost is extremely high. Therefore, local materials are required to be obtained on the premise of not damaging the original environment of the reef island, and the invention provides a rapid repair material suitable for damaged buildings and structures in the reef island engineering, so as to improve the service performance of the buildings and structures. The problem of poor durability of the conventional quick repair materials commonly used for damaged buildings and structures generally exists.
Disclosure of Invention
In view of the above, the invention provides a building damage repairing material, a preparation method thereof and a repairing method thereof, which can be used for repairing damaged buildings and structures in severe coral island reef environments, so that the service lives of the buildings and the structures are prolonged, and the building damage repairing material is more practical.
In order to achieve the first object, the technical scheme of the building damage repairing material provided by the invention is as follows:
the building damage repair material provided by the invention comprises the following components in parts by weight:
the content of dead burned magnesium oxide: 26-40;
mixing amount of potassium dihydrogen phosphate: 13-23;
the mixing amount of the composite retarder is as follows: 2-4;
the aggregate mixing amount is as follows: 28-45 parts of;
blending amount of blending water: 8-14;
the aggregate is coral sand or land-source sand taken from coral island reef areas, and the particle size of the aggregate is adjusted according to the size of a damage crack of a building to be repaired.
The building damage repairing material provided by the invention can be further realized by adopting the following technical measures.
Preferably, the particle size range of the coral sand is 0.075mm to 4.75mm, the fineness modulus of the coral sand ranges from 2.50 to 2.90, and the bulk density of the coral sand is 1100kg/m3-1200kg/m3The porosity of the coral sand ranges from 50% to 70%, and the apparent density of the coral sand ranges from 2700kg/m3-2800kg/m3The water absorption rate of the coral sand for 1 hour ranges from 1.5% to 2.5%, and the chloride ion content of the coral sand ranges from 0.1% to 0.2%.
Preferably, the particle size range of the land-source sand is 0.075mm-4.75mm, the fineness modulus range of the land-source sand is 2.30-2.80, and the bulk density range of the land-source sand is 1200kg/m3-1600kg/m3The porosity of the land-source sand ranges from 40.0% to 50.0%, and the apparent density of the land-source sand ranges from 2500kg/m3-2800kg/m3The value range of the 1h water absorption of the land-source sand is 0.30-0.50%, and the value range of the chloride ion content of the land-source sand is 0.01-0.02%.
Preferably, the composite retarder comprises the following components in parts by weight:
borax: 19-50;
sodium citrate: 19-43;
sodium chloride: 14-37;
the weight parts of the components in the composite retarder are related to the setting time of the building damage repairing material.
Preferably, the mixed water is seawater or land-source fresh water in the coral island region.
Preferably, the activity of the dead-burned magnesium oxide is 10-15%, and the dead-burned magnesium oxide containsThe weight percentage content of MgO is more than or equal to 92 percent, and the volume density value range of the dead burned magnesia is 3.00g/cm3-3.30g/cm3The granularity of the dead burned magnesia is 160 meshes-250 meshes.
Preferably, the purity of the potassium dihydrogen phosphate is more than or equal to 95 percent, and the pH value range of the solution of the potassium dihydrogen phosphate is 4.3-4.7.
In order to achieve the second object, the technical scheme of the preparation method of the building damage repairing material provided by the invention is as follows:
the preparation method of the building damage repairing material provided by the invention comprises the following steps:
obtaining coral sand or land-source sand in a coral island region;
screening out grains with the grain diameter larger than a set grain diameter in the coral sand or the land-source sand in the coral island region to obtain a spare aggregate;
acquiring the condensation time for repairing the damage of the building according to the damage condition of the building to be repaired;
obtaining a standby composite retarder according to the setting time;
providing the following components in parts by weight: the content of dead burned magnesium oxide is as follows: 26-40; mixing amount of potassium dihydrogen phosphate: 13-23; the mixing amount of the composite retarder is as follows: 2-4; aggregate mixing amount: 28-45 parts of; blending amount of blending water: 8-14;
stirring the aggregate and the set amount of mixing water to obtain a first product;
stirring the composite retarder, the dead burned magnesium oxide and the potassium dihydrogen phosphate with the first product to obtain a second product;
and stirring the residual mixing water and the second product to obtain the building damage repairing material.
The preparation method of the building damage repairing material provided by the invention can be further realized by adopting the following technical measures.
Preferably, the set amount of mixing water accounts for 20-30% of the total amount of the mixing water.
As a preference, the first and second liquid crystal compositions are,
stirring the aggregate and the set amount of mixed water to obtain a first product, wherein the value range of the stirring duration time is 40-80 s;
in the step process of stirring the composite retarder, the dead burned magnesium oxide and the potassium dihydrogen phosphate with the first product to obtain a second product, the value range of the stirring duration time is 40-80 s;
in the step process of stirring the residual mixed water and the second product to obtain the building damage repair material, after the low-speed stirring duration time range is 40-80 s, the high-speed stirring duration time range is 40-80 s, wherein in the low-speed stirring process, the stirring speed range is 135-145 r/min; and in the high-speed stirring process, the value range of the stirring speed is 275r/min-295 r/min.
Preferably, the dead burned magnesium oxide and the potassium dihydrogen phosphate are stored separately before use.
In order to achieve the third object, the technical solution of the method for repairing a damaged building provided by the present invention is as follows:
the method for repairing the damage of the building comprises the following steps:
confirming the damage type and the damage degree of a building to be repaired;
according to the damage type and the damage degree of the building to be repaired, the building damage repairing material provided by the invention is applied to repair the damage of the building to be repaired, so that the repaired building is obtained.
The method for repairing the damage of the building can be further realized by adopting the following technical measures.
Preferably, after the step of applying the building damage repairing material provided by the present invention to repair the damage of the building to be repaired according to the damage type and the damage degree of the building to be repaired to obtain the repaired building, the method further comprises the following steps:
detecting the repaired building periodically;
if the repaired building is damaged again, the damaged repairing material for the building provided by the invention is applied to repair the damaged again.
Preferably, the damage degree of the building to be repaired is one or more of a fine crack, a common crack and a surface denudation damage, wherein the size of the fine crack is less than or equal to 1.5mm, and the size of the common crack is more than 1.5 mm.
Preferably, the method for repairing damage to the fine crack includes the following steps:
pretreating the fine cracks to obtain pretreated fine cracks;
performing leakage test on the pretreated fine cracks to obtain a leakage test result;
according to the leakage test result, the grouting liquid provided by the invention is configured;
injecting the grouting liquid into the pretreated fine cracks under a set pressure condition to obtain a repaired building subjected to primary grouting treatment;
and secondary grouting is carried out in the tiny cracks of the repaired building after the primary grouting treatment, and the surface of the repaired building is cleaned, so that the final repaired building is obtained.
Preferably, the step of performing pretreatment on the fine cracks to obtain the pretreated fine cracks specifically includes the following steps:
marking the positions of the fine cracks, and determining the marked positions of the fine cracks;
cleaning floating dust in the small cracks marked at the positions and on the surfaces of the small cracks, wherein if the small cracks are blocked by soil, a dust collector is used for absorbing the small cracks to obtain the cleaned small cracks;
and wrapping the cleaned fine cracks by using a sealing adhesive tape to obtain the fine cracks waiting for leakage testing treatment.
Preferably, the method for repairing the damage of the common crack comprises the following steps:
cutting a V-shaped groove or a U-shaped groove with a set size at the joint of the common crack;
cleaning sundries in the V-shaped groove or the U-shaped groove to obtain a treated common crack;
preparing the grouting liquid provided by the invention, wherein the grouting liquid is adaptive to the treated common crack;
injecting the treated common crack by the grouting liquid under a set pressure condition to obtain a repaired building subjected to primary grouting treatment;
and (4) performing secondary grouting in the common crack of the repaired building subjected to the primary grouting treatment, and performing surface cleaning to obtain the final repaired building.
Preferably, the method for repairing the surface ablation damage comprises the following steps:
cleaning and surface treatment are carried out on the surface denudation damage to obtain a surface to be repaired after pretreatment;
preparing the repair slurry provided by the invention, wherein the slurry is adaptive to the surface to be repaired after pretreatment;
applying the repairing slurry to perform smearing treatment on the pretreated surface to be repaired to obtain a smeared surface to be repaired;
troweling the surface to be repaired after the smearing treatment to obtain the surface to be repaired after the troweling treatment;
and cleaning the surface to be repaired after the troweling treatment to obtain the final repaired building.
As a preference, the first and second liquid crystal compositions are,
the cutting size of the V-shaped groove ranges from 40mm to 60mm in width and from 30mm to 50mm in depth;
the U-shaped groove has the size that the width of the upper bottom ranges from 70mm to 90mm, the width of the lower bottom ranges from 20mm to 40mm, and the depth ranges from 50mm to 70 mm.
Preferably, when the surface is denudated and damaged, the area is more than or equal to 400cm2The repair of the spalled damaged structure, applying the repair slurry to smear the pretreated surface to be repaired to obtain a smeared surfaceBefore the step of smearing the treated surface to be repaired, the method also comprises the step of adding a pin bolt on the surface to be smeared.
Preferably, in the step of repairing the damage of the building to be repaired by applying the building damage repairing material provided by the invention according to the damage type and the damage degree of the building to be repaired to obtain the repaired building, the proportion of the building damage repairing material is adjusted according to the actual situation, and the fluidity of the repairing mortar is adjusted by water doping; and adjusting the aggregate grain diameter and the mixing amount of the repair mortar according to the size condition of the crack.
The rapid repairing material for the damage building and the structure of the coral island region, the preparation method and the repairing method thereof provided by the invention have the following beneficial effects:
(1) the potassium phosphate magnesium cement-based coral mortar provided by the invention can be used for rapidly repairing damaged buildings and structures in coral island reef areas and preventing the influence of extreme environments such as rainfall, stormy waves, tides and the like on the performance of the mortar. Meanwhile, the repair mortar can be prepared from local materials, has good interface bonding performance with marine concrete, good corrosion resistance and good volume stability, thereby prolonging the service life of buildings and structures.
(2) The composite retarder provided by the invention can adjust the setting time of the repair mortar according to actual conditions, reduce the hydration heat, enhance the early strength of the repair mortar and continuously increase the later strength.
(3) The preparation method of the rapid repair material and the repair method of the damaged structure provided by the invention can give full play to the advantages of good bonding property and high strength of the repair material, ensure effective bonding of the repair mortar and the damaged structure and further ensure the repair effect.
Detailed Description
In view of this, the invention provides a building damage repairing material, a preparation method thereof and a repairing method thereof, which can be used for repairing damaged buildings and structures in a severe coral reef environment, so that the service lives of the buildings and the structures are prolonged, and the building damage repairing material is more practical.
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be given to a building damage repairing material, a preparation method thereof and a repairing method thereof according to the present invention, and the detailed implementation manner, structure, characteristics and effects thereof. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The term "and/or" herein is only one kind of association relationship describing the association object, and means that three relationships may exist, for example, a and/or B, and is specifically understood as follows: both a and B may be included, a may be present alone, or B may be present alone, and any of the three cases can be provided.
Example 1
The invention provides a rapid repair material for damage buildings and structures in coral island reef areas and a preparation method thereof, and the specific embodiment is as follows:
the fast repairing material for the damaged building and structure in coral island is prepared with aggregate, dead burnt magnesia, potassium dihydrogen phosphate, composite retarder and water in certain proportion. Wherein the weight percentage of the calcined magnesia is 26-40, the weight percentage of the monopotassium phosphate is 13-23, the weight percentage of the composite retarder is 2-4, the weight percentage of the aggregate is 28-45, and the weight percentage of the water is 8-14.
The aggregate is coral sand taken from coral island reef areas, the particle size range is 0.075-4.75 mm, the fineness modulus is 2.70, and the bulk density is 1131kg/m3Porosity 58.9%, apparent density 2750kg/m3The water absorption rate is 1.96% in 1 hour, and the chloride ion content is 0.11%. The aggregate can also be replaced by land-source sand, the particle size range is 0.075-4.75 mm, the fineness modulus is 2.58, and the bulk density is 1450kg/m3A porosity of 45.1% and an apparent density of 2640kg/m3The water absorption rate is 0.45% in 1h, and the chloride ion content is 0.014%. In addition, the particle size and the mixing amount of the aggregate can be adjusted according to the size of cracks in actual engineering conditions.
The composite retarder is formed by mixing borax, sodium citrate and sodium chloride according to a certain proportion, wherein the borax component accounts for 19-50 percent by mass, the sodium citrate component accounts for 19-43 percent by mass, and the sodium chloride component accounts for 14-37 percent by mass. According to the construction requirement, the component of the composite retarder can be adjusted, so that the setting time of the rapid repair material can be adjusted and controlled.
The mixing water can be seawater or land-source fresh water from coral island reef area.
The activity of the dead burned magnesia is 12.2 percent, the MgO content in the dead burned magnesia powder is more than or equal to 92 percent, and the volume density is 3.18g/cm3The granularity is 200 meshes. The purity of the potassium dihydrogen phosphate is 98%, and the pH value of the solution is 4.3-4.7. Furthermore, in the preferred embodiment of the invention, the dead burned magnesium oxide and the potassium dihydrogen phosphate are separately stored before use, so as to prevent the damage building and the repair effect of the damage building and the structure from being influenced by the acid-base neutralization reaction of the dead burned magnesium oxide and the potassium dihydrogen phosphate.
The invention provides a preparation method of a rapid repair material for a damaged building and a structure in a coral island reef area, which comprises the following specific embodiments:
the method comprises the following steps: and screening out particles with the particle size larger than 4.75mm in the coral sand or river sand, and drying the sieved aggregate in the sun to obtain 28-45 parts by mass for later use.
Step two: according to the setting time required by construction, borax, sodium citrate and sodium chloride are mixed according to a certain proportion to prepare the composite retarder. And taking 2-4 parts by mass of the composite retarder for later use.
Step three: and taking 26-40 parts by mass of dead-burned magnesium oxide and 13-23 parts by mass of monopotassium phosphate for later use.
Step four: 8-14 parts by mass of mixing water is taken for standby.
Step five: pouring all prepared aggregates and quarter water into a stirring barrel, and pre-stirring the aggregates for 1 minute by using a stirrer; then pouring the prepared composite retarder, dead-burned magnesium oxide and monopotassium phosphate into a barrel and stirring at a low speed for 1 minute; and finally, pouring the rest water into a stirring barrel, stirring at a low speed for 1 minute, and then stirring at a high speed for 1 minute.
Example 2
Corresponding to the potassium magnesium phosphate cement-based coral mortar prepared in example 1, example 2 provides a method for rapidly repairing a damaged structure, and the specific implementation flow comprises:
the method comprises the following steps: and carrying out health detection on the structure to determine the damage type of the damaged structure, wherein the damage of the damaged structure can be mainly divided into surface ablation damage and structure cracking damage. If the structure is cracked and damaged, the width of the crack is measured and divided into a small crack with the thickness less than or equal to 1.5mm and a common crack with the thickness more than 1.5 mm.
Step two: for the tiny crack damage of the structure, the crack is repaired by adopting a low-pressure grouting method, and the repairing process comprises the following steps: crack treatment, leakage test, grouting liquid preparation, pressure grouting, secondary grouting and surface cleaning. Marking the positions of the fine cracks, and determining the marked positions of the fine cracks; cleaning floating dust in the small cracks marked at the positions and on the surfaces of the small cracks, wherein if the small cracks are blocked by soil, a dust collector is used for absorbing the small cracks to obtain the cleaned small cracks; and wrapping the cleaned fine cracks by using a sealing adhesive tape to obtain the fine cracks to be subjected to leakage testing treatment, and sticking a grouting nozzle. The sealing adhesive tape is used for treating small cracks by adopting a certain pressure, and the repair mortar is injected into the cracks through the grouting nozzle, and because the cracks are small, the repair mortar can be ensured to completely enter the cracks through pressure grouting through the grouting nozzle. For convenience of construction, the sealing tape for sticking the grouting nozzle and the sealing tape for wrapping the fine cracks may be the same. The purpose of the leakage test is to detect whether there is a through crack, because the presence of the through crack will cause the leakage of the repair mortar slurry, affecting the repair effect. The leakage test method is that soap water is coated on the closed crack, and a grouting nozzle is adopted to ventilate the crack. For common crack damage of a structure, a cutting and grouting method is adopted, a V-shaped groove or a U-shaped groove with a certain size is cut at the joint of the bridge according to the actual situation of the crack, and the cutting size of the V-shaped groove is 50mm in width and 40mm in depth; the U-shaped groove has a width of 80mm at the upper bottom, a width of 30mm at the lower bottom and a depth of 60 mm. And cleaning sundries in the tank by using high-pressure water, wherein the repairing process comprises the following steps in sequence: the method comprises the following steps of crack treatment, grouting liquid preparation, pressure grouting, secondary grouting and surface cleaning, wherein the aggregate and a set amount of mixing water are stirred to obtain a first product, and the set amount of mixing water accounts for 20-30% of the total amount of the mixing water, and the reason is that the aggregate (particularly coral sand) has high porosity and can absorb moisture in a reaction system in the reaction process, so that the repairing effect of the repairing mortar is influenced. Therefore, the aggregate is soaked in advance by adopting a pre-wetting method, so that the aggregate can be prevented from absorbing water in a reaction system in the reaction process, and the repairing effect is ensured. For the surface denudation damage, the damaged structural surface needs to be cleaned and roughened, and the repairing process sequentially comprises the following steps: treating a structural surface, preparing repair mortar, smearing a repair surface, leveling a mortar surface and cleaning the surface. In the preferred embodiment of the invention, for repairing large-area peeled and damaged structures, pins can be added on the surface of the structure, so that the bonding strength of the interface between the new structure and the old structure is enhanced. The fluidity of the grouting liquid, the particle size of the aggregate and the mixing amount of the grouting liquid are determined according to actual conditions, the maximum particle size of the aggregate should not exceed the width of a crack, the fluidity of a material for surface repair should be as low as possible, and the material for crack repair should have certain fluidity.
Step three: the damaged structure after being repaired is required to be periodically detected, and the damaged part with poor reinforcing effect is required to be secondarily reinforced.
Example 3
Corresponding to the rapid repair material for the damaged structures and constructions in the coral island reef area and the preparation method and the repair method thereof in the embodiments 1 and 2, the embodiment 3 provides a proportion optimization test method for the rapid repair material, and the specific implementation method comprises the following steps:
according to the related requirements of the standard of 'repair mortar' (JC/T2381-2016), the proportion of the repair mortar is optimized and the compressive strengths of different ages are tested. The test method comprises the steps of setting three parallel test samples in each test group of a cubic test block with the size of a compressive strength test piece of 40 multiplied by 40mm, taking the average value of results, and if the difference between the maximum value or the minimum value of the results and the middle value is more than 15%, rounding off the maximum value or the minimum value, and taking the average value of the rest results.
The blending amount of each factor of the repair mortar proportioning optimization test is as follows: the mass ratio of the dead burned magnesium oxide to the monopotassium phosphate is as follows: 1.5-2.5, the mass ratio of the mixing water to the potassium magnesium phosphate cement is as follows: 0.18-0.25, and the mass ratio of the coral sand to the potassium magnesium phosphate cement is as follows: 0.5-1, mass ratio of retarder to dead burned magnesia: 0.05 to 0.11. A four-factor three-level orthogonal test is designed according to the doping range of each factor, and the orthogonal test design table is shown in Table 1. The compressive strength tests are carried out on the samples at different curing ages, the proportion of the repair mortar is optimized, and the compressive strengths of the repair mortar at different curing ages are shown in table 2.
TABLE 1 design table for optimizing blending amount of repair mortar
Figure BDA0003618927510000121
TABLE 2 results of the optimization test (unit MPa)
Figure BDA0003618927510000122
Example 4
The embodiment 4 provides a comparison test which adopts coral sand and land-source sand as aggregates on the basis of the optimal mixing ratio, and tests the influence of different aggregates on the performance of the repair mortar, wherein the specific implementation method comprises the following steps:
the blending amount of each factor of the repair mortar is as follows: the mass ratio of the dead burned magnesia to the monopotassium phosphate is 2, the mass ratio of the mixing water to the potassium magnesium phosphate cement is 0.18, the mass ratio of the coral sand or the land-sourced sand to the potassium magnesium phosphate cement is 0.5, and the mass ratio of the retarder to the dead burned magnesia is 0.11.
The test of the compressive strength, the flexural strength and the salt solution corrosion resistance of the repair mortar with different aggregates is carried out according to the relevant requirements of the standard of repair mortar (JC/T2381-2016). Test pieces for testing the compressive strength and the salt solution corrosion resistance are cubic test pieces with the size of 40 multiplied by 40mm, test pieces for testing the flexural strength are cubic test pieces with the size of 40 multiplied by 160mm, three parallel test samples are arranged in each test group, the average value of the results is taken, if the difference between the maximum value or the minimum value of the results and the middle value is more than 15%, the maximum value or the minimum value is discarded, and the average value of the rest results is taken. The results of the performance tests of the land-source sand aggregate and the coral sand aggregate are shown in table 3. According to the results in the table, the mortar performance of two different aggregates can meet the requirements of relevant specifications.
TABLE 3 test results of different aggregate mortar properties
Figure BDA0003618927510000131
It will be appreciated that modifications and variations are possible to those skilled in the art in light of the above teachings, and it is intended to cover all such modifications and variations as fall within the scope of the appended claims.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. The building damage repair material is characterized by comprising the following components in parts by weight:
the content of dead burned magnesium oxide: 26-40;
the blending amount of the potassium dihydrogen phosphate is as follows: 13-23;
the mixing amount of the composite retarder is as follows: 2-4;
aggregate mixing amount: 28-45 parts of;
blending amount of blending water: 8-14;
the aggregate is coral sand or land-source sand taken from coral island reef areas, and the particle size of the aggregate is adjusted according to the size of a damage crack of a building to be repaired.
2. The building damage repair material as claimed in claim 1, wherein the coral sand has a particle size ranging from 0.075mm to 4.75mm, a fineness modulus ranging from 2.50 to 2.90, and a bulk density of 1100kg/m3-1200kg/m3The porosity of the coral sand ranges from 50% to 70%, and the apparent density of the coral sand ranges from 2700kg/m3-2800kg/m3The water absorption rate of the coral sand for 1 hour ranges from 1.5% to 2.5%, and the chloride ion content of the coral sand ranges from 0.1% to 0.2%.
3. The building damage repair material according to claim 1, wherein the particle size of the land-derived sand ranges from 0.075mm to 4.75mm, the fineness modulus of the land-derived sand ranges from 2.30 to 2.80, and the bulk density of the land-derived sand ranges from 1200kg/m3-1600kg/m3The porosity of the land-source sand ranges from 40.0% to 50.0%, and the apparent density of the land-source sand ranges from 2500kg/m3-2800kg/m3The 1h water absorption of the land-source sand ranges from 0.30% to 0.50%, and the chloride ion content of the land-source sand ranges from 0.01% to 0.02%.
4. The building damage repair material of claim 1, wherein the composite retarder comprises the following components in parts by weight:
borax: 19-50;
sodium citrate: 19-43;
sodium chloride: 14-37;
the weight parts of the components in the composite retarder are related to the setting time of the building damage repairing material.
5. The building damage repair material according to claim 1, wherein the mixed water is seawater or fresh water from a land source in the reef area of the coral island.
6. The building damage repair material according to claim 1, wherein the activity of the dead burned magnesium oxide is 10-15%, the weight percentage of MgO in the dead burned magnesium oxide is not less than 92%, and the volume density of the dead burned magnesium oxide is 3.00g/cm3-3.30g/cm3The granularity of the dead burned magnesium oxide is 160 meshes to 250 meshes;
preferably, the purity of the monopotassium phosphate is greater than or equal to 95%, and the pH value range of the solution of the monopotassium phosphate is 4.3-4.7.
7. The method for preparing a building damage repair material according to any one of claims 1 to 6, comprising the steps of:
obtaining coral sand or land-source sand in a coral island reef area;
screening out grains with the grain size larger than a set grain size in coral sand or land-source sand in the coral island reef area to obtain a spare aggregate;
acquiring the coagulation time for repairing the damage of the building according to the damage condition of the building to be repaired;
obtaining a standby composite retarder according to the setting time;
providing the following components in parts by weight: the content of dead burned magnesium oxide: 26-40; mixing amount of potassium dihydrogen phosphate: 13-23; mixing amount of the composite retarder: 2-4; aggregate mixing amount: 28-45 parts of; blending amount of blending water: 8-14;
stirring the aggregate and the set amount of mixed water to obtain a first product;
stirring the composite retarder, the dead burned magnesium oxide and the potassium dihydrogen phosphate with the first product to obtain a second product;
and stirring the residual mixing water and the second product to obtain the building damage repairing material.
8. The method for preparing a building damage repair material according to claim 7, wherein the set amount of mixing water is 20-30% of the total amount of the mixing water;
as a preference, the first and second liquid crystal compositions are,
stirring the aggregate and the set amount of mixing water to obtain a first product, wherein the value range of the stirring duration time is 40-80 s;
in the step process of stirring the composite retarder, the dead burned magnesium oxide and the potassium dihydrogen phosphate with the first product to obtain a second product, the value range of the stirring duration time is 40-80 s;
stirring the residual mixing water and the second product to obtain the building damage repair material, wherein after the low-speed stirring duration time range is 40-80 s, the high-speed stirring duration time range is 40-80 s, and the stirring speed range is 135-145 r/min in the low-speed stirring process; in the process of high-speed stirring, the value range of the stirring speed is 275r/min-295 r/min;
preferably, the dead burned magnesium oxide and the potassium dihydrogen phosphate are stored separately before use.
9. A method for repairing a damaged building, comprising the steps of:
confirming the damage type and the damage degree of a building to be repaired;
according to the damage type and the damage degree of the building to be repaired, the building damage repairing material of any one of claims 1-6 is applied to repair the damage of the building to be repaired, and the repaired building is obtained.
10. The method for repairing building damage according to claim 9, wherein the step of applying the building damage repairing material according to any one of claims 1-6 to repair the building damage according to the type and degree of the building damage to be repaired to obtain the repaired building further comprises the following steps:
detecting the repaired building periodically;
if the repaired building is damaged again, applying the building damage repairing material of any one of claims 1-6 to repair the damaged again;
preferably, the damage degree of the building to be repaired is one or more of a fine crack, a common crack and a surface denudation damage, wherein the size of the fine crack is less than or equal to 1.5mm, and the size of the common crack is more than 1.5 mm;
preferably, the method for repairing damage to the fine crack includes the following steps:
pretreating the fine cracks to obtain pretreated fine cracks;
performing leak testing on the pretreated fine cracks to obtain a leak testing result;
configuring the grouting liquid according to any one of claims 1 to 6 according to the leakage test result;
injecting the grouting liquid into the pretreated fine cracks under a set pressure condition to obtain a repaired building subjected to primary grouting treatment;
secondary grouting is carried out in the tiny cracks of the repaired building after the primary grouting treatment, and the surface of the repaired building is cleaned, so that the final repaired building is obtained;
preferably, the step of performing pretreatment on the fine cracks to obtain the pretreated fine cracks specifically includes the following steps:
marking the positions of the fine cracks, and determining the marked positions of the fine cracks;
cleaning floating dust in the small cracks with marked positions and on the surfaces of the small cracks, wherein if the small cracks are blocked by soil, a dust collector is used for absorbing the small cracks to obtain the cleaned small cracks;
wrapping the cleaned fine cracks by using a sealing adhesive tape to obtain fine cracks to be subjected to leakage testing treatment;
preferably, the method for repairing the damage of the common crack comprises the following steps:
cutting a V-shaped groove or a U-shaped groove with a set size at the joint of the common crack;
cleaning sundries in the V-shaped groove or the U-shaped groove to obtain a treated common crack;
configuring the grout of any of claims 1-6, said grout being compatible with the treated common fracture;
injecting the grouting liquid into the treated common crack under a set pressure condition to obtain a repaired building subjected to primary grouting treatment;
secondary grouting is carried out in the ordinary cracks of the repaired building after the primary grouting treatment, and the surface of the repaired building is cleaned, so that a final repaired building is obtained;
preferably, the method for repairing the surface ablation damage comprises the following steps:
cleaning and surface treating the surface denudation damage to obtain a pretreated surface to be repaired;
configuring the repair slurry of any of claims 1-6, said slurry being compatible with said pretreated surface to be repaired;
applying the repairing slurry to perform smearing treatment on the surface to be repaired after pretreatment to obtain the surface to be repaired after smearing treatment;
troweling the surface to be repaired after the smearing treatment to obtain the surface to be repaired after the troweling treatment;
cleaning the surface to be repaired after the screeding treatment to obtain a final repaired building;
as a preference, the first and second liquid crystal compositions are,
the cutting size of the V-shaped groove is that the width value range is 40mm-60mm, and the depth value range is 30mm-50 mm;
the U-shaped groove has the size that the width of the upper bottom ranges from 70mm to 90mm, the width of the lower bottom ranges from 20mm to 40mm, and the depth ranges from 50mm to 70 mm;
preferably, when the surface is denudated and broken, the area is more than or equal to 400cm2Before the step of applying the repair slurry to coat the pretreated surface to be repaired to obtain the coated surface to be repaired, the method also comprises the step of adding a pin bolt on the surface to be coated;
preferably, in the step of repairing the damage of the building to be repaired by applying the building damage repairing material according to any one of claims 1 to 6 according to the damage type and the damage degree of the building to be repaired to obtain the repaired building, the proportion of the building damage repairing material is adjusted according to the actual situation, and the fluidity of the repairing mortar is adjusted by adding water; and adjusting the aggregate particle size and the mixing amount of the repair mortar according to the size condition of the crack.
CN202210451772.1A 2022-04-24 2022-04-24 Building damage repairing material, preparation method and repairing method thereof Pending CN114773025A (en)

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Citations (4)

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US4786328A (en) * 1987-07-16 1988-11-22 American Stone-Mix, Inc. Magnesium phosphate cement systems
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4786328A (en) * 1987-07-16 1988-11-22 American Stone-Mix, Inc. Magnesium phosphate cement systems
CN107056225A (en) * 2017-04-12 2017-08-18 武汉理工大学 A kind of phosphate cement based patching material and preparation method thereof
CN111253142A (en) * 2020-03-19 2020-06-09 山东坊能新动能科学研究院有限公司 Magnesium phosphate cement with good water resistance and application thereof
CN112537941A (en) * 2020-12-03 2021-03-23 中冶建筑研究总院有限公司 Seawater coral aggregate concrete for rush repair and rush construction engineering and preparation method thereof

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