CN110357545B - Mortar for quickly repairing local damage of concrete base layer and preparation method thereof - Google Patents
Mortar for quickly repairing local damage of concrete base layer and preparation method thereof Download PDFInfo
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- CN110357545B CN110357545B CN201910756845.6A CN201910756845A CN110357545B CN 110357545 B CN110357545 B CN 110357545B CN 201910756845 A CN201910756845 A CN 201910756845A CN 110357545 B CN110357545 B CN 110357545B
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Classifications
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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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
-
- 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
- C04B2111/10—Compositions or ingredients thereof characterised by the absence or the very low content of a specific material
- C04B2111/1062—Halogen free or very low halogen-content materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/72—Repairing or restoring existing buildings or building materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
-
- 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
Abstract
The invention relates to a quick repair mortar for local damage of a concrete base layer and a preparation method thereof, which are characterized by comprising the following raw materials in parts by weight: 50-70 parts of aggregate, 20-30 parts of composite cement, 4-8 parts of butylbenzene emulsion, 1-3 parts of coupling agent, 0.5-2 parts of composite shrinkage reducing agent, 0.1-0.5 part of water repellent, 0.1-0.5 part of graphene dispersion liquid and 0.1-0.5 part of polypropylene fiber; the composite cement comprises fluoroaluminate cement and ferrous aluminate cement, the mass ratio of the fluoroaluminate cement to the ferrous aluminate cement is 2-3:1, the aggregate is natural sand, and the particle size of the natural sand is 30-120 meshes, wherein 30-50 meshes account for 15%, 51-80 meshes account for 55%, and 81-120 meshes account for 30%. According to the invention, by adjusting the formula and the proportion, various trace additives are added, the pore structure of the mortar matrix is improved, the compactness of the mortar is increased, the construction performance and the shrinkage performance of the repaired concrete are improved, the strength is rapidly developed within a short time after the pouring is finished, and the application requirement of the local rapid repair of the concrete matrix is met.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a concrete base layer local damage rapid repair mortar applied to rapid repair of local damage parts in concrete roads, bridges and plant concrete terraces and a preparation method thereof.
Background
Concrete and reinforced concrete are widely used in various fields as main building materials. Due to the reasons of unreasonable design, construction defects, environmental erosion, improper maintenance and the like of the concrete structure and the aging of the concrete structure, the concrete structure is influenced by factors such as heavy load, freeze-thaw cycle, chloride ion permeation, surface abrasion, erosion of corrosive media and the like in the long-term use process, the phenomena of cracking, peeling, hollowing and the like occur locally on a plurality of concretes, the normal use of the concrete structure is seriously influenced, the service life of the project is greatly influenced, and great potential safety hazard and economic loss are brought.
Existing repair mortars include inorganic repair mortars, polymeric repair materials, and polymeric modified repair materials. The inorganic repair material mortar has the advantages of high strength and good compatibility, but has the problems of high viscosity, poor construction property, low bonding strength and poor aesthetic property; the polymer repairing material takes various polymers as cementing materials, has the outstanding advantages of high bonding strength, short curing time, good durability and the like, but has poor compatibility with cement base materials and high cost; the polymer modified patching material utilizes the polymer to modify the cement-based material, although the compatibility of the patching material and the cement-based material is improved to a certain extent, the cost is too high, and the application of the patching material is influenced. In addition, the shearing resistance and the bonding strength of the new and old concrete interfaces are the key of the local repairing technology of the concrete base layer. The shear strength of the interface between the new concrete and the old concrete is far less than that of the newly repaired concrete and that of the old concrete, and when the composite structure of the new concrete and the old concrete is subjected to shear failure stress caused by load or environmental factors, the interface between the new concrete and the old concrete becomes a weak link of shear failure. If the shear-resistant bonding strength of the interface of the new and old concrete is insufficient, the bonded composite structure of the new and old concrete can be damaged, and finally the local repair failure of the concrete can be caused.
Disclosure of Invention
The invention aims to provide the quick repair mortar for the local damage of the concrete base layer and the preparation method thereof.
The invention is realized by the following steps:
the mortar for quickly repairing the local damage of the concrete base layer is characterized by comprising the following raw materials in parts by weight: 50-70 parts of aggregate, 20-30 parts of composite cement, 4-8 parts of butylbenzene emulsion, 1-3 parts of coupling agent, 0.5-2 parts of composite shrinkage reducing agent, 0.1-0.5 part of water repellent, 0.1-0.5 part of graphene dispersion liquid and 0.1-0.5 part of polypropylene fiber; the composite cement is fluoroaluminate cement and ferrous aluminate cement, the mass ratio of the fluoroaluminate cement to the ferrous aluminate cement is 2-3:1, the aggregate is natural sand, the particle size of the natural sand is 30-120 meshes, wherein 30-50 meshes account for 15%, 51-80 meshes account for 55%, and 81-120 meshes account for 30%.
Further preferably, the solid content of the butylbenzene emulsion is 45-50%, and the butylbenzene emulsion is produced by Jinan Europe New Material science and technology Limited company.
More preferably, the coupling agent is a silane coupling agent KH-560.
Further preferably, the composite shrinkage reducing agent is a mixture of rubber powder, silicon powder and a defoaming agent, and the weight ratio of the rubber powder to the silicon powder to the defoaming agent is 1:0.5: 1-2.
Further preferably, the water repellent is an organic silicon water repellent which is produced by Jiangsu Mega building materials science and technology limited company.
More preferably, the graphene dispersion liquid is a carboxylated graphene oxide dispersion liquid, and the mass fraction of the carboxylated graphene oxide dispersion liquid is 15 mg/mL.
Preferably, the preparation method of the carboxylated graphene oxide dispersion liquid comprises the steps of adding the carboxylated graphene oxide into water, carrying out ultrasonic treatment, carrying out water bath ultrasonic treatment until no precipitate is deposited, and fully dispersing the carboxylated graphene oxide into the water to obtain the carboxylated graphite oxide dispersion liquid, wherein the weight ratio of the carboxylated graphite oxide to the water is 5-8: 1.
Preferably, the polypropylene fiber is a modified polypropylene fiber, and the preparation method of the modified polypropylene fiber comprises the steps of placing the dried polypropylene fiber into a chromic acid solution, soaking at room temperature for 1-2 hours for reaction, washing, filtering and drying the reacted polypropylene fiber to constant weight to obtain the modified polypropylene fiber.
Further preferably, the chromic acid solution is prepared by taking K according to the mass ratio2Cr2O7、H2O、KMnO4And concentrated H2SO4Mixing and reacting to obtain chromic acid solution, wherein K is2Cr2O7、H2O、KMnO4And concentrated H2SO4The mass ratio of (A) to (B) is 2:5:1: 0.5.
The preparation method of the rapid repair mortar for the local damage of the concrete base layer comprises the following steps:
s1, diluting the butylbenzene emulsion with water, wherein the volume ratio of the butylbenzene emulsion to the water is 1:5-8, adding the carboxylated graphene oxide dispersion, and stirring until the mixture is completely uniform to obtain a mixture solution;
s2, aggregate, composite cement, a coupling agent, a composite shrinkage reducing agent, a water repellent and polypropylene fiber are sequentially added into a stirrer according to a proportion and stirred for 3-5 minutes; and slowly pouring the mixture solution obtained in the step S1 into a stirrer in a stirring state, and continuously stirring for 3-5min after the mixture solution is added to obtain the rapid repair mortar for the local damage of the concrete base layer.
The use method of the rapid repair mortar for the local damage of the concrete base layer comprises the following steps:
removing broken stones and loosened concrete in an area needing to be repaired, cleaning dust and the like, thoroughly washing the ground or a repaired base layer by using a high-pressure gun, leaving water on the ground or the repaired base layer for a period of time, and cleaning the water after the water is sufficiently wetted; stirring and mixing uniformly according to the water cement ratio of 0.15-0.25:1, pouring the mixture into the ground or a repaired base layer, immediately troweling or scraping and smoothing the mixture by a trowel or a scraping ruler, controlling the operation time of the repair mortar within 30 minutes, and naturally curing the mixture for three hours after the repair is finished.
The outstanding substantive features and remarkable progress of the invention are as follows:
1. the rapid repair mortar for local damage of the concrete base layer takes the composite cement and the aggregate as raw materials, and is doped with a plurality of trace additives by adjusting the formula and the proportion, so that the pore structure of the mortar matrix is improved, the compactness of the mortar is increased, the construction performance and the shrinkage performance of the repair concrete are improved, and the shrinkage of the repair mortar is reduced.
2. The invention adopts the coarse and fine aggregate with good gradation to form a compact space structure, reduces the void ratio and the relative dosage of the set cement, and further reduces the shrinkage of the concrete repair mortar.
3. The composite cement compounded by the fluoroaluminate cement and the ferroaluminate cement has the advantages of compact microstructure, increased internal surface area, obviously reduced average pore radius, high hardening speed, less water demand and good workability, and greatly improves the strength of the mortar.
4. The styrene-butadiene emulsion adopted by the invention can improve the construction performance and the shrinkage performance of the repaired concrete, greatly improve the compression strength and the rupture strength of the repaired concrete and improve various physical and mechanical properties of the concrete.
5. The silane coupling agent adopted by the invention has chemical reaction with the concrete, so that the waterproof performance and the chloride ion permeation resistance of the early concrete are improved; the principle of modification of the silane coupling agent is as follows: the silane coupling agent and concrete are subjected to dehydration condensation reaction to form siloxane polymer in a hydrogen bond forming mode, and the polymer covers the surface of the concrete to form a hydrophobic net film; the cement stone and the aggregate, and the cement stone are tightly connected in the concrete through chemical bonds, so that the internal structure of the concrete is improved.
6. The adopted composite shrinkage reducing agent can effectively eliminate air bubbles in concrete, reduce the porosity inside the concrete and improve the pore structure and the compactness of the concrete, thereby being beneficial to reducing the shrinkage of the concrete and enhancing the strength of the concrete.
7. The water repellent adopted by the invention can effectively inhibit the diffusion of free moisture in the mortar, has good inhibition effect on early drying shrinkage and dehydration shrinkage of the repair mortar, can effectively enhance the toughness of the mortar, reduce the compression-fracture ratio of concrete, greatly improve the toughness of the repair mortar and reduce the shrinkage of the repair mortar.
8. According to the invention, the self-made carboxylated graphene oxide dispersion liquid is adopted, and the surface of the carboxylated graphene oxide contains oxygen-containing functional groups such as hydroxyl, epoxy, carboxyl and the like, so that the carboxylated graphene oxide dispersion liquid has excellent chemical activity and wettability, the fluidity of a cement slurry system in a mixing process is favorably improved, the activity of a hydration product is excited, various hydration reactions are promoted to form crystals, the strength loss caused by uneven distribution of the crystals and insufficient compactness of the hydration product is improved, the shearing resistance and bonding strength of an interface of new and old concrete can be improved, the bending strength of the interface is improved, and the mechanical property and the durability of the mortar concrete are obviously improved.
9. The invention adds the modified polypropylene fiber in trace amount, improves the dispersion property of the polypropylene fiber in the cement-based material, improves the bonding strength between the fiber and the base material, and improves the shear-resistant bonding strength of the interface of the new and old concrete; the modified polypropylene fiber is also beneficial to improving the performance of repairing mortar, and when cement mortar is dehydrated and dried, the high elastic modulus characteristic of the modified polypropylene fiber is utilized, so that the expansion of microcracks is prevented, and the crack resistance of the mortar is improved.
Detailed Description
The present invention will be described below with reference to examples.
Example 1
Raw materials (by weight portion):
50 parts of aggregate, 20 parts of composite cement, 4 parts of butylbenzene emulsion, 1 part of coupling agent, 0.5 part of composite shrinkage reducing agent, 0.1 part of water repellent, 0.1 part of graphene dispersion liquid and 0.1 part of polypropylene fiber.
The preparation method comprises the following steps:
s1, diluting the butylbenzene emulsion with water, wherein the volume ratio of the butylbenzene emulsion to the water is 1:5-8, adding the carboxylated graphene oxide dispersion, and stirring until the mixture is completely uniform to obtain a mixture solution;
s2, aggregate, composite cement, a coupling agent, a composite shrinkage reducing agent, a water repellent and polypropylene fiber are sequentially added into a stirrer according to a proportion and stirred for 3-5 minutes; and slowly pouring the mixture solution obtained in the step S1 into a stirrer in a stirring state, and continuously stirring for 3-5min after the mixture solution is added to obtain the rapid repair mortar for the local damage of the concrete base layer.
Example 2
70 parts of aggregate, 30 parts of composite cement, 8 parts of butylbenzene emulsion, 3 parts of coupling agent, 2 parts of composite shrinkage reducing agent, 0.5 part of water repellent, 0.5 part of graphene dispersion liquid and 0.5 part of polypropylene fiber.
The preparation method of the rapid repair mortar for local damage of the concrete base layer is the same as that of the embodiment 1.
Example 3
60 parts of aggregate, 25 parts of composite cement, 5 parts of butylbenzene emulsion, 2 parts of coupling agent, 1 part of composite shrinkage reducing agent, 0.2 part of water repellent, 0.2 part of graphene dispersion liquid and 0.2 part of polypropylene fiber.
The preparation method of the rapid repair mortar for local damage of the concrete base layer is the same as that of the embodiment 1.
Example 4
65 parts of aggregate, 28 parts of composite cement, 6 parts of butylbenzene emulsion, 2.5 parts of coupling agent, 1.5 parts of composite shrinkage reducing agent, 0.3 part of water repellent, 0.3 part of graphene dispersion liquid and 0.3 part of polypropylene fiber.
The preparation method of the rapid repair mortar for local damage of the concrete base layer is the same as that of the embodiment 1.
Test effects
The performance parameters of the concrete base layer local damage rapid repair mortar in the embodiments 1-4 are as follows:
the repair mortars of examples 1 to 4 according to the invention were tested according to the standard JCT2381-2016, each example being tested 5 times according to the standard requirements, the test results being averaged as follows:
Claims (1)
1. the mortar for quickly repairing the local damage of the concrete base layer is characterized by comprising the following raw materials in parts by weight: 50-70 parts of aggregate, 20-30 parts of composite cement, 4-8 parts of butylbenzene emulsion, 1-3 parts of coupling agent, 0.5-2 parts of composite shrinkage reducing agent, 0.1-0.5 part of water repellent, 0.1-0.5 part of graphene dispersion liquid and 0.1-0.5 part of polypropylene fiber; the composite cement is fluoroaluminate cement and ferrous aluminate cement, the mass ratio of the fluoroaluminate cement to the ferrous aluminate cement is 2-3:1, the aggregate is natural sand, the particle size of the natural sand is 30-120 meshes, wherein 30-50 meshes account for 15%, 51-80 meshes account for 55%, and 81-120 meshes account for 30%;
the solid content of the butylbenzene emulsion is 45-50%;
the composite shrinkage reducing agent is a mixture of rubber powder, silicon powder and a defoaming agent, and the weight ratio of the rubber powder to the silicon powder to the defoaming agent is 1:0.5: 1-2;
the graphene dispersion liquid is carboxylated graphene oxide dispersion liquid, and the mass fraction of the carboxylated graphene oxide dispersion liquid is 15 mg/mL;
the polypropylene fiber is modified polypropylene fiber, the preparation method of the modified polypropylene fiber comprises the steps of putting the dried polypropylene fiber into chromic acid solution, soaking for 1-2 hours at room temperature for reaction, washing, filtering and drying the reacted polypropylene fiber to constant weight to obtain the modified polypropylene fiber;
the chromic acid solution is prepared by taking K according to the mass ratio2Cr2O7、H2O、KMnO4And concentrated H2SO4Mixing and reacting to obtain chromic acid solution, wherein K is2Cr2O7、H2O、KMnO4And concentrated H2SO4The mass ratio of (1) to (2: 5: 0.5);
the coupling agent is a silane coupling agent KH-560;
the water repellent is an organic silicon water repellent;
the preparation method of the mortar for quickly repairing the local damage of the concrete base layer comprises the following steps:
s1, diluting the butylbenzene emulsion with water, wherein the volume ratio of the butylbenzene emulsion to the water is 1:5-8, adding the carboxylated graphene oxide dispersion, and stirring until the mixture is completely uniform to obtain a mixture solution;
s2, aggregate, composite cement, a coupling agent, a composite shrinkage reducing agent, a water repellent and polypropylene fiber are sequentially added into a stirrer according to a proportion and stirred for 3-5 minutes; and slowly pouring the mixture solution obtained in the step S1 into a stirrer in a stirring state, and continuously stirring for 3-5min after the mixture solution is added to obtain the rapid repair mortar for the local damage of the concrete base layer.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112408868A (en) * | 2019-12-23 | 2021-02-26 | 鲍欢 | Preparation method of wear-resistant impact-resistant epoxy mortar repair material |
| CN111732366A (en) * | 2020-07-07 | 2020-10-02 | 四川恒泽建材有限公司 | Concrete interface treating agent and preparation method thereof |
| CN112456927A (en) * | 2020-11-16 | 2021-03-09 | 辽宁省交通高等专科学校 | Graphene oxide/polymer modified cement-based repair mortar and preparation method thereof |
| CN112679190B (en) * | 2021-01-21 | 2022-07-05 | 广东碧通百年科技有限公司 | Reinforcing waterproof mortar for filling concrete bottom cavity |
| CN113754392A (en) * | 2021-07-13 | 2021-12-07 | 黑龙江常岭建材科技有限公司 | Quick concrete repair mortar |
| CN115321885B (en) * | 2022-08-04 | 2023-05-30 | 临沂天元混凝土工程有限公司 | Polymer modified cement-based repair mortar for marine concrete and preparation method thereof |
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| JP2656513B2 (en) * | 1987-11-27 | 1997-09-24 | 住友大阪セメント株式会社 | Self-leveling material |
| CN1190387C (en) * | 2003-05-26 | 2005-02-23 | 四川嘉华企业（集团）股份有限公司 | Road rapid mending agent |
| CN104058694B (en) * | 2014-06-27 | 2016-01-13 | 无锡市崇安区科技创业服务中心 | A kind of concrete material for pavement patching and constructional method thereof |
| CN105906289B (en) * | 2016-01-26 | 2018-09-18 | 广东电网有限责任公司电力科学研究院 | Concrete repairs dry-mixed mortar and preparation method thereof |
| CN106007592A (en) * | 2016-05-23 | 2016-10-12 | 广西横县恒丰建材有限责任公司 | Super early strength type plastic expansion repair mortar and production method thereof |
| CN106220093A (en) * | 2016-07-26 | 2016-12-14 | 蚌埠市方阵商品混凝土有限公司 | A kind of workability with excellence and the concrete of mechanical property |
| CN106430174A (en) * | 2016-10-09 | 2017-02-22 | 黎明职业大学 | Monolithic graphene oxide aqueous dispersing solution and preparation method thereof |
| CN107140922A (en) * | 2017-07-05 | 2017-09-08 | 张聪聪 | Road quick patching mortar and its production method |
| CN108130715B (en) * | 2018-01-23 | 2020-06-09 | 辽宁工程技术大学 | Modification method of polypropylene fiber |
| CN108947419B (en) * | 2018-07-17 | 2021-04-09 | 广东复特新型材料科技有限公司 | Special repair mortar for structure and preparation method |
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