CN112521125A - Rapid hardening grouting material for repairing deep cracks in low negative temperature environment - Google Patents
Rapid hardening grouting material for repairing deep cracks in low negative temperature environment Download PDFInfo
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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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
- C04B2201/05—Materials having an early high strength, e.g. allowing fast demoulding or formless casting
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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
- C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
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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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- Chemical Kinetics & Catalysis (AREA)
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- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a rapid hardening grouting material for repairing deep cracks in a low negative temperature environment, which comprises the following components in parts by weight: 100 parts of magnesium phosphate cement, 5-15 parts of a composite retarding component, 20-30 parts of a functional admixture, 2-4 parts of redispersible latex powder, 0.5-2 parts of a water reducing component, 0.3-0.6 part of a suspension stabilizing component, 0.05-0.20 part of a defoaming component, 0.5-1.5 parts of a freezing point reducing component and 15-35 parts of water. The grouting material has the advantages of good fluidity, strong permeability, normal setting and hardening in low and negative temperature environment, high bonding strength, high early strength and high strength, no shrinkage, good volume stability, close thermal expansion coefficient to concrete and the like, and is particularly suitable for the repair construction of deep cracks of concrete in the low and negative temperature environment.
Description
Technical Field
The invention belongs to the field of concrete defect repair engineering, and particularly relates to a quick-hardening grouting material for repairing deep cracks of concrete in a low negative temperature environment.
Background
Cracks are one of the common defects of concrete, not only affect the appearance of the concrete, but also reduce the impermeability of the concrete, and simultaneously affect the durability of the concrete and shorten the service life of the concrete. Concrete cracks can be classified into shallow cracks and deep cracks according to the crack depth classification. For shallow cracks, a process of slotting and pouring crack filling can be adopted for repairing; for deep cracks, the deep cracks are repaired by adopting a pressure glue injection/grouting method. Different repair processes require different repair materials for construction. At present, the concrete crack repairing materials mainly comprise: cement-based grouting materials, polyurethane crack adhesives, epoxy resin crack adhesives and the like.
The cement-based grouting material is commonly used for filling and repairing concrete shallow cracks, when the grouting material is used for grouting deep cracks, in order to improve permeability, water consumption of the grouting material is often large, bleeding shrinkage is easily caused, and after the grouting material is cured, due to the defects of large drying shrinkage, easiness in cracking, low bonding strength and the like, the grouting material is easily separated from original concrete, so that repair failure is caused. The polyurethane crack glue is mainly used for flood irrigation and repair of shallow cracks. Epoxy resin type joint injection glue is very suitable for treating deep cracks of concrete under the action of pressure, but the viscosity of the material is increased rapidly along with the reduction of construction temperature, when the temperature is reduced to 10 ℃ from 25 ℃, the viscosity of common epoxy glue is increased by 2-4 times or more, the higher viscosity hinders the permeation and the flowing of the glue in the cracks, and the crack repairing effect is directly influenced. Especially, when the temperature is lower than 5 ℃ or even negative temperature, the glue injection is difficult, and the epoxy resin glue solution can not be cured normally, so that the construction can not be carried out. In addition, the organic repair materials generally have the problems of low material matching, poor durability, insufficient environmental protection, high unit price and the like.
The patent CN201810798120.9 discloses a concrete crack repairing material based on phosphorus-magnesium material and a construction process thereof, the fluidity of the material is about 220mm, the material can only be used for repairing cracks on the surface layer of concrete, and deep cracks, especially through cracks of large-thickness concrete can not be completely repaired and solved. The furfural-acetone dilution system described in patent CN201510046828.5 reduces acetone volatilization, and the slurry has the advantages of low viscosity, good fillability, low curing shrinkage rate and the like, but the glue solution does not use highly toxic furfural, the slurry has poor environmental protection property, and the solvent volatilization pollutes the environment, so that the curing heat release is large, and the problems of 'implosion' and the like are easy to occur. The invention relates to a concrete repairing agent and a preparation method thereof (CN 110563375A), which adopts polymethylene polyphenyl isocyanate as a main agent and has the technical characteristics of low normal-temperature viscosity, small change of low-temperature viscosity, good flexibility of a cured body, strong adhesion, good permeability and low cost, but the material has large difference of thermal expansion coefficient with concrete, is easy to separate from the concrete under the action of cold-heat circulation, has insufficient durability and has unclear application effect at low and negative temperature. Therefore, it is necessary to develop a rapid repairing material for concrete cracks in order to meet the engineering requirement of rapidly repairing deep cracks of concrete in low and negative temperature environments.
Disclosure of Invention
Based on the characteristics of magnesium phosphate cement, the invention provides a rapid hardening grouting material for repairing deep cracks in a low negative temperature (-5-8 ℃) environment by adopting the technical approaches of strong dispersion of chemical additives, effective flow aiding of functional admixtures and the like, and the specific technical scheme is as follows:
a quick-hardening grouting material for repairing deep cracks in a low negative temperature environment comprises the following components in parts by weight: 100 parts of magnesium phosphate cement, 5-15 parts of composite retarding component, 20-30 parts of functional admixture, 2-4 parts of redispersible latex powder, 0.5-2 parts of water reducing component, 0.3-0.6 part of suspension stabilizing component, 0.05-0.20 part of defoaming component, 0.5-1.5 parts of freezing point reducing component and 15-35 parts of water.
Preferably, the magnesium phosphate cement is prepared by mixing dead-burned magnesium oxide and monopotassium phosphate according to the ratio of M/P (molar ratio/P) of 4:1, wherein the burning temperature of the dead-burned magnesium oxide is not lower than 1500 ℃, the content of the magnesium oxide is not lower than 85%, the average grain diameter is 40 mu M, and the monopotassium phosphate is of industrial grade.
Preferably, the composite retarding component consists of boric acid or borax and sodium dihydrogen phosphate according to the weight ratio of 5:1-7: 1.
Preferably, the functional admixture consists of nanometer micro-beads with flow aid effect and silica fume which provides 'crystal nucleus' effect and increases the compactness of the system according to the weight ratio of 1:1-2: 1.
Preferably, the redispersible latex powder is polyvinyl acetate rubber powder 5111L which can increase the fluidity of the system.
Preferably, the water reducing component is a powdery polycarboxylic acid water reducing agent, and the water reducing rate is more than or equal to 28%.
Preferably, the suspension stabilizer is one of low-viscosity cellulose ether or welan gum and xanthan gum;
preferably, the defoaming component is a special defoaming agent for polysiloxane dry powder mortar.
Preferably, the freezing point depression component is an antifreezing agent consisting of sodium nitrite and sodium sulfate according to a weight ratio of 3: 1.
The rapid hardening grouting material for repairing deep cracks in the low negative temperature environment has the following properties at the temperature of-5-8 ℃ in the presence of fresh slurry: the initial fluidity of the truncated cone circular die is more than or equal to 380mm, and the fluidity in 15min is more than or equal to 320 mm; the coagulation time is less than or equal to 45 min; meanwhile, under the condition of low negative temperature, the strength of the hardened body of the grouting material is as follows: the 3h compressive strength is more than or equal to 30MPa, the 1d compressive strength is more than or equal to 40MPa, and the 28d compressive strength is more than or equal to 60 MPa; the 28d expansion rate is more than or equal to-0.04 percent; the positive tensile bonding strength with concrete is more than or equal to 2.5 MPa; coefficient of thermal expansion: 8 to 10 x 10-6/℃。
Compared with the prior art, the invention has the advantages that:
(1) compared with common portland cement, sulphoaluminate cement and aluminate cement, the magnesium phosphate cementing material system adopted by the quick-hardening grouting material for repairing the deep cracks in the low negative temperature environment can be normally coagulated and hardened in the low negative temperature environment, has very high initial strength and can quickly recover the use function; in addition, as chemical cement, the cement has high bonding strength with concrete, small shrinkage and better volume stability.
(2) The grouting material obviously reduces the viscosity of the grouting material through the strong dispersion effect of the water reducing component, so that the grouting material obtains excellent permeability, the flow property of the grouting material can be further improved by 5111L and nano micro beads which flow aid, in addition, the raw materials of the grouting material are all powder materials and do not contain coarse particles, the homogeneity of the grouting material is ensured through a suspension stabilizer, the compactness of a hardening body is increased through a defoaming agent and silica fume, and the grouting material is particularly suitable for repairing deep cracks of concrete.
(3) Compared with epoxy resin crack healers and polyurethane crack healers, the grouting material has good material compatibility with concrete, the thermal expansion coefficient, the elastic modulus and the like of the grouting material are close to those of the concrete, the defect that the viscosity of organic materials is increased along with the reduction of temperature is overcome, and meanwhile, the grouting material is higher in environmental protection performance and better in durability.
Detailed Description
The following examples further illustrate the technical solutions of the present invention, but should not be construed as limiting the scope of the present invention.
Example 1
A quick-hardening grouting material for repairing deep cracks in a low negative temperature environment comprises the following components in parts by weight: 100 parts of magnesium phosphate cement, 8 parts of a composite retarding component, 20 parts of a functional admixture, 3 parts of redispersible latex powder, 1.5 parts of a water reducing component, 0.3 part of a suspension stabilizing component, 0.10 part of a defoaming component, 1.8 parts of a freezing point reducing component and 30 parts of water.
Wherein the magnesium phosphate cement is prepared by mixing dead-burned magnesium oxide and monopotassium phosphate according to the ratio of M/P value of 4:1, wherein the burning temperature of the dead-burned magnesium oxide is 1500-1600 ℃, the content of the magnesium oxide is 91%, the average grain diameter is 40 mu M, and the monopotassium phosphate is industrial grade; the composite retarding component consists of boric acid and sodium dihydrogen phosphate according to the weight ratio of 5: 1; the functional admixture consists of nano micro-beads and silica fume according to the weight ratio of 1: 1; the redispersible latex powder is 5111L of rubber powder; the water reducing component is a powdery polycarboxylic acid water reducing agent, and the water reducing rate is more than or equal to 28 percent; the suspension stabilizer is low-viscosity cellulose ether; the defoaming component is a special defoaming agent for polysiloxane dry powder mortar; the freezing point depressing component is composed of sodium nitrite and sodium sulfate in a weight ratio of 3: 1.
The rapid hardening grouting material for repairing deep cracks in the low negative temperature environment has the following properties at the temperature of-5 ℃: the initial fluidity of the truncated cone circular die is 390mm, and the fluidity for 15min is 335 mm; the coagulation time is 35 min; meanwhile, under the condition of-5 ℃, the strength of a hardened body of the grouting material is as follows: the 3h compressive strength is 32.5MPa, the 1d compressive strength is 45.6MPa, and the 28d compressive strength is 64 MPa; 28d expansion rate is 0.03%; the positive tensile bonding strength with concrete is 3.2 MPa; coefficient of thermal expansion of 8.1X 10-6/℃。
Example 2
A quick-hardening grouting material for repairing deep cracks in a low negative temperature environment comprises the following components in parts by weight: 100 parts of magnesium phosphate cement, 12 parts of a composite retarding component, 30 parts of a functional admixture, 4 parts of redispersible latex powder, 2 parts of a water-reducing component, 0.5 part of a suspension stabilizing component, 0.15 part of a defoaming component, 1.0 part of a freezing point reducing component and 35 parts of water.
Wherein the magnesium phosphate cement is prepared by mixing dead-burned magnesium oxide and monopotassium phosphate according to the ratio of M/P value of 4:1, wherein the burning temperature of the dead-burned magnesium oxide is 1600 +/-50 ℃, the content of the magnesium oxide is 93 percent, the average grain diameter is 40 mu M, and the monopotassium phosphate is industrial grade; the composite retarding component consists of boric acid and sodium dihydrogen phosphate according to the weight ratio of 7: 1; the functional admixture consists of nano micro-beads and silica fume according to the weight ratio of 2: 1; the redispersible latex powder is 5111L of rubber powder; the water reducing component is a powdery polycarboxylic acid water reducing agent, and the water reducing rate is more than or equal to 28 percent; the suspension stabilizer is welan gum; the defoaming component is a special defoaming agent for polysiloxane dry powder mortar; the freezing point depressing component is composed of sodium nitrite and sodium sulfate in a weight ratio of 3: 1.
The rapid hardening grouting material for repairing deep cracks in the low negative temperature environment has the following properties at the temperature of 0 ℃ in the presence of fresh slurry: the initial fluidity of the truncated cone circular die is 405mm, and the fluidity in 15min is 345 mm; the coagulation time is 45 min; meanwhile, under the condition of 0 ℃, the strength of the hardened body of the grouting material is as follows: the 3h compressive strength is 33.6MPa, the 1d compressive strength is 50.8MPa, and the 28d compressive strength is 65.4 MPa; 28d expansion rate is 0.02%; the positive tensile bonding strength with concrete is 2.8 MPa; coefficient of thermal expansion of 9.3X 10-6/℃。
Example 3
A quick-hardening grouting material for repairing deep cracks in a low negative temperature environment comprises the following components in parts by weight: 100 parts of magnesium phosphate cement, 15 parts of a composite retarding component, 25 parts of a functional admixture, 3.5 parts of redispersible latex powder, 1.8 parts of a water-reducing component, 0.45 part of a suspension stabilizing component, 0.20 part of a defoaming component, 0.6 part of a freezing point reducing component and 33 parts of water.
Wherein the magnesium phosphate cement is prepared by mixing dead-burned magnesium oxide and monopotassium phosphate according to the ratio of M/P value of 4:1, wherein the burning temperature of the dead-burned magnesium oxide is 1600 +/-50 ℃, the content of the magnesium oxide is 89 percent, the average grain diameter is 40 mu M, and the monopotassium phosphate is industrial grade; the composite retarding component consists of boric acid and sodium dihydrogen phosphate according to the weight ratio of 6: 1; the functional admixture consists of nano micro-beads and silica fume according to the weight ratio of 1.5: 1; the redispersible latex powder is 5111L of rubber powder; the water reducing component is a powdery polycarboxylic acid water reducing agent, and the water reducing rate is more than or equal to 28 percent; the suspension stabilizer is welan gum; the defoaming component is a special defoaming agent for polysiloxane dry powder mortar; the freezing point depressing component is composed of sodium nitrite and sodium sulfate in a weight ratio of 3: 1.
The rapid hardening grouting material for repairing deep cracks in the low negative temperature environment has the following properties at the temperature of 8 ℃: the initial fluidity of the truncated cone circular die is 385mm, and the fluidity in 15min is 325 mm; the coagulation time is 38 min; meanwhile, under the condition of 8 ℃, the strength of a hardened body of the grouting material is as follows: the 3h compressive strength is 37.6MPa, the 1d compressive strength is 53.4MPa, and the 28d compressive strength is 71.3 MPa; 28d expansion rate is 0.04%; the positive tensile bonding strength with concrete is 2.9 MPa; coefficient of thermal expansion of 9.6X 10-6/℃。
Claims (10)
1. The quick-hardening grouting material for repairing the deep cracks in the low negative temperature environment is characterized by comprising the following raw materials in parts by weight:
magnesium phosphate cement: 100 parts of (A);
a composite retarding component: 5-15 parts;
functional admixture: 20-30 parts of a solvent;
redispersible latex powder: 2-4 parts;
water reducing component: 0.5-2 parts;
suspension stabilizing component: 0.3-0.6 part;
defoaming components: 0.05-0.20 part;
freezing point depressing component: 0.5-1.5 parts;
water: 15-35 parts.
2. The rapid hardening grouting material for deep crack repair in a low negative temperature environment according to claim 1, characterized in that: the magnesium phosphate cement is prepared by mixing dead-burned magnesium oxide and monopotassium phosphate according to the ratio of M/P (molar ratio/P) of 4:1, wherein the burning temperature of the dead-burned magnesium oxide is not lower than 1500 ℃, the content of the magnesium oxide is not lower than 85%, the average grain diameter is 40 mu M, and the monopotassium phosphate is industrial grade.
3. The rapid hardening grouting material for deep crack repair in a low negative temperature environment according to claim 1, characterized in that: the composite retarding component consists of boric acid or borax and sodium dihydrogen phosphate according to the weight ratio of 5:1-7: 1.
4. The rapid hardening grouting material for deep crack repair in a low negative temperature environment according to claim 1, characterized in that: the functional admixture is composed of nanometer micro-beads with a flow aid effect and silica fume which provides a crystal nucleus effect and increases the compactness of a system according to the weight ratio of 1:1-2: 1.
5. The rapid hardening grouting material for deep crack repair in a low negative temperature environment according to claim 1, characterized in that: the redispersible latex powder is polyvinyl acetate rubber powder 5111L capable of increasing the fluidity of a system.
6. The rapid hardening grouting material for deep crack repair in a low negative temperature environment according to claim 1, characterized in that: the water reducing component is a powdery polycarboxylic acid water reducing agent, and the water reducing rate is more than or equal to 28 percent.
7. The rapid hardening grouting material for deep crack repair in a low negative temperature environment according to claim 1, characterized in that: the suspension stabilizer is one of low-viscosity cellulose ether or welan gum and xanthan gum.
8. The rapid hardening grouting material for deep crack repair in a low negative temperature environment according to claim 1, characterized in that: the defoaming component is a special defoaming agent for polysiloxane dry powder mortar.
9. The rapid hardening grouting material for deep crack repair in a low negative temperature environment according to claim 1, characterized in that: the freezing point depression component is an antifreezing agent consisting of sodium nitrite and sodium sulfate according to the weight ratio of 3: 1.
10. The rapid hardening grouting material for repairing deep cracks in a low negative temperature environment as claimed in any one of claims 1 to 9, wherein the properties of the freshly mixed grouting material at a temperature of-5 ℃ to 8 ℃ are as follows: the initial fluidity of the truncated cone circular die is more than or equal to 380mm, and the fluidity in 15min is more than or equal to 320 mm; the coagulation time is less than or equal to 45 min; meanwhile, under the condition of low negative temperature, the strength of the hardened body of the grouting material is as follows: the 3h compressive strength is more than or equal to 30MPa, the 1d compressive strength is more than or equal to 40MPa, and the 28d compressive strength is more than or equal to 60 MPa; the 28d expansion rate is more than or equal to-0.04 percent; the positive tensile bonding strength with concrete is more than or equal to 2.5 MPa; coefficient of thermal expansion: 8 to 10 x 10-6/℃。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113653157A (en) * | 2021-08-16 | 2021-11-16 | 广东楠通建设工程有限公司 | Grouting repair method for inner wall of municipal rainwater and sewage pipeline |
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| CN101880152A (en) * | 2010-06-04 | 2010-11-10 | 上海交通大学 | Reinforcing and repairing grouting material for construction in minus-temperature environment |
| CN108002802A (en) * | 2017-12-04 | 2018-05-08 | 山东创能机械科技有限公司 | A kind of New Phosphorus magnesia-based cements injecting paste material and preparation method |
| CN108069692A (en) * | 2017-11-23 | 2018-05-25 | 武汉三源特种建材有限责任公司 | A kind of Rapid-Repair magnesium phosphate grout material and preparation method thereof |
| CN109928711A (en) * | 2019-04-19 | 2019-06-25 | 辽宁科大中驰镁建材科技有限公司 | The magnesia high-strength slip casting material for repairing of one kind and preparation method and application |
| CN110563432A (en) * | 2019-10-21 | 2019-12-13 | 南京兴佑交通科技有限公司 | Grouting material based on magnesium phosphate cement |
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2020
- 2020-12-16 CN CN202011488618.9A patent/CN112521125A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101880152A (en) * | 2010-06-04 | 2010-11-10 | 上海交通大学 | Reinforcing and repairing grouting material for construction in minus-temperature environment |
| CN108069692A (en) * | 2017-11-23 | 2018-05-25 | 武汉三源特种建材有限责任公司 | A kind of Rapid-Repair magnesium phosphate grout material and preparation method thereof |
| CN108002802A (en) * | 2017-12-04 | 2018-05-08 | 山东创能机械科技有限公司 | A kind of New Phosphorus magnesia-based cements injecting paste material and preparation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113653157A (en) * | 2021-08-16 | 2021-11-16 | 广东楠通建设工程有限公司 | Grouting repair method for inner wall of municipal rainwater and sewage pipeline |
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