CN110698150B - Anti-crack repair mortar and preparation method thereof - Google Patents
Anti-crack repair mortar and preparation method thereof Download PDFInfo
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- CN110698150B CN110698150B CN201911140549.XA CN201911140549A CN110698150B CN 110698150 B CN110698150 B CN 110698150B CN 201911140549 A CN201911140549 A CN 201911140549A CN 110698150 B CN110698150 B CN 110698150B
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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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant 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
- C04B2111/40—Porous or lightweight 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
- C04B2201/05—Materials having an early high strength, e.g. allowing fast demoulding or formless casting
-
- 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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- 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 belongs to the technical field of repair materials, and particularly relates to anti-crack repair mortar and a preparation method thereof. Aiming at the technical problem that the existing building industry is lack of a repair mortar with quick drying and good bonding property, the invention provides an anti-crack repair mortar, which comprises the following components: 5 to 20 percent of sulphoaluminate cement in percentage by weight; 25 to 40 percent of ordinary Portland cement; 5 to 10 percent of expanding agent; 20% -30% of quartz sand; 20 to 30 percent of ceramsite sand; 1 to 3 percent of redispersible latex powder; 0.01 to 0.04 percent of defoaming agent; (K12) 0.005% -0.05%; 0.001 to 0.01 percent of welan gum; 0.1 to 0.3 percent of water reducing agent; 0.01 to 0.04 percent of plastic expanding agent; 0 to 0.02 percent of lithium carbonate; 0.05 to 0.2 percent of polypropylene fiber; the sum of the weight of the components is 100 percent. The invention also provides a preparation method of the anti-crack repair mortar. The anti-crack repair mortar disclosed by the invention has the characteristics of light weight, early strength, high bonding performance and anti-crack performance, and has a good application prospect.
Description
Technical Field
The invention belongs to the technical field of repair materials, and particularly relates to anti-crack repair mortar and a preparation method thereof.
Background
The cement concrete has been applied to building engineering construction for hundreds of years, and plays a significant role in modernization career and economic development. However, as cement concrete has the defects of low tensile strength and large drying shrinkage, the buildings are easy to have concrete surface holes, surface peeling and cracking, and even have the problems of pulverization of concrete or mortar, bare reinforcing steel bars at structural parts and the like under the action of environmental external force along with the lapse of time.
In order to solve the problem of cement concrete in buildings, patent CN105036664A discloses an outdoor rapid repair mortar. The mortar is mainly composed of ordinary portland cement, sulpho-aluminum cement, sand, a defoaming agent, a water reducing agent, HPMC (hydroxy propyl methyl cellulose), rubber powder, lithium carbonate and citric acid, can be quickly hardened, has high strength and can be used for outdoor quick repair. However, the repair mortar of the patent is easy to crack after later hardening, and has poor later effect.
In the existing building industry, a repair mortar which is quick-drying and good in bonding property is still lacked to meet the requirements of the building industry, and the development is urgently needed.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the prior building industry lacks a technical problem of quick-drying repair mortar with good bonding property.
The technical scheme for solving the technical problems comprises the following steps: provides an anti-crack repair mortar. The components of the composition comprise: according to the weight percentage, the weight percentage of the alloy is,
the sum of the weight of the components is 100 percent.
In the anti-crack repair mortar, the expanding agent is a concrete expanding agent. Preferably calcium sulphoaluminate-calcium oxide concrete expanding agent.
In the anti-crack repair mortar, the defoaming agent is a P803 powder defoaming agent.
In the anti-crack repair mortar, the water reducing agent is a Frank polycarboxylic acid water reducing agent.
In the anti-crack repair mortar, the particle size of the quartz sand is 40-70 meshes.
In the anti-crack repair mortar, the particle size of the ceramsite sand is 20-40 meshes.
The invention also provides a preparation method of the anti-crack repair mortar, which comprises the following steps:
a. weighing redispersible latex powder, a defoaming agent, K12, welan gum, a water reducing agent, a plastic expanding agent, lithium carbonate and polypropylene fiber according to the weight percentage;
b. adding the raw materials weighed in the step a into ordinary portland cement for premixing to obtain premix; and weighing sulphoaluminate cement, an expanding agent, quartz sand and ceramsite sand, and uniformly mixing with the premix to obtain the anti-crack repair mortar.
The invention also provides a use method of the anti-crack repair mortar, which comprises the following steps:
firstly, adding water according to the water-material ratio of 0.15-0.20, then adding the anti-crack repair mortar, and stirring at a high speed for 3-5 min.
In the use method of the anti-crack repair mortar, the high-speed stirring speed is 700 r/min-1200 r/min.
The invention has the beneficial effects that:
the invention provides the anti-crack repair mortar, which is innovatively added with light ceramsite sand, so that the mortar achieves the light effect, and can repair the quality problems of surface concrete or concrete quality problems of vault facades such as bridge, culvert and tunnel buildings and the like by combining the high bonding performance of the mortar. The crack-resistant repair mortar has light weight (dry density is not more than 1700 g/cm)3) Early strength (the strength can reach more than 10MPa in 3 h), high bonding performance (the tensile bonding strength is more than 2MPa, and the bending tensile strength of an interface is more than or equal to 2.5 MPa; JC/T2381-2016 repair mortar is more than or equal to 1MPa, the interface bending strength is more than or equal to 2MPa) and the crack resistance (the dry shrinkage rate is less than or equal to 0.02%), the coagulation time of the slurry can be adjusted through the OPC-SAC binary gel (the coagulation time can be adjusted according to construction requirements, the adjustment range is 15-60 min), so that the construction time of the slurry can be controlled (within 10-30 min), and the application prospect is good.
Detailed Description
The invention provides anti-crack repair mortar which comprises the following components: according to the weight percentage, the weight percentage of the alloy is,
the sum of the weight of the components is 100 percent.
The invention is creatively added with a plastic expanding agent in the early hardening stage, so that the repair mortar is more fit with the surface to be repaired, and the dual anti-cracking mode of the expanding agent and the fiber is adopted in the later stage, so that the effect of 1+1 & gt 2 is obtained, and the repair mortar is ensured to have excellent anti-cracking performance.
The invention reduces the working performance of the repair mortar by matching the lightweight aggregate with K12 (air entraining agent), adjusts the hardening time of the whole repair material through an OPC-SAC binary gelling system, and ensures the crack resistance of the repair mortar through the bonding performance of redispersible latex powder and welan gum repair material slurry and adding polypropylene fiber and expanding agent; the repair mortar can be used for solving the quality problem of concrete on the building surface or repairing concrete easy-pulverization and falling positions of vault facades such as bridges, culverts, tunnels and the like by combining the light weight, early strength and high bonding performance of the repair mortar.
In the anti-crack repair mortar, the expanding agent is a concrete expanding agent. Preferably calcium sulphoaluminate to calcium oxide concrete expanding agents.
In the anti-crack repair mortar, the defoaming agent is a P803 powder defoaming agent.
In the anti-crack repair mortar, the water reducing agent is a powdery polycarboxylic acid water reducing agent.
Wherein, in order to prevent the plastering tool from being stuck during the plastering tool construction, the anti-cracking repair mortar cannot be too sticky, so the particle size of the quartz sand is required to be 40-70 meshes.
In the anti-crack repair mortar, the ceramsite sand is not suitable for being too large in particle size, thick in particle size, uneven in construction and surface and most suitable for being 20-40 meshes.
The invention also provides a preparation method of the anti-crack repair mortar, which comprises the following steps:
a. weighing redispersible latex powder, a defoaming agent, K12, welan gum, a water reducing agent, a plastic expanding agent, lithium carbonate and polypropylene fiber according to the weight percentage;
b. adding the raw materials weighed in the step a into ordinary portland cement for premixing to obtain premix; and weighing sulphoaluminate cement, an expanding agent, quartz sand and ceramsite sand, and uniformly mixing with the premix to obtain the anti-crack repair mortar.
The invention also provides a use method of the anti-crack repair mortar, which comprises the following steps:
firstly, adding water according to the water-material ratio of 0.15-0.20, then adding the anti-crack repair mortar, and stirring at a high speed for 3-5 min.
In the use method of the anti-crack repair mortar, the high-speed stirring speed is 700 r/min-1200 r/min.
The following examples are intended to illustrate specific embodiments of the present invention without limiting the scope of the invention to the examples.
Example 1 preparation of an anti-crack repair mortar according to the invention
The raw materials of the composition comprise:
15% of sulphoaluminate cement, 30% of ordinary portland cement, 5% of an expanding agent, 23.725% of quartz sand (40-70 meshes), 24% of ceramsite sand (20-40 meshes), 1.5% of redispersible latex powder, 0.02% of a defoaming agent, K120.01%, 0.005% of welan gum, 0.2% of a water reducing agent, 0.02% of a plastic expanding agent, 0.02% of lithium carbonate and 0.5% of polypropylene fibers.
The preparation method comprises the following steps:
a. weighing redispersible latex powder, a defoaming agent, K12, welan gum, a water reducing agent, a plastic expanding agent, lithium carbonate and polypropylene fiber according to the weight percentage;
b. adding the raw materials weighed in the step a into ordinary portland cement for premixing to obtain premix; and weighing sulphoaluminate cement, an expanding agent, quartz sand and ceramsite sand, and uniformly mixing with the premix to obtain the anti-crack repair mortar.
Example 2 preparation of an anti-crack repair mortar according to the invention
The raw materials of the composition comprise:
25% of sulphoaluminate cement, 20% of ordinary portland cement, 5% of an expanding agent, 23.725% of quartz sand (40-70 meshes), 24% of ceramsite sand (20-40 meshes), 1.5% of redispersible latex powder, 0.02% of a defoaming agent, K120.01%, 0.005% of welan gum, 0.2% of a water reducing agent, 0.02% of a plastic expanding agent, 0.02% of lithium carbonate and 0.5% of polypropylene fibers.
The preparation method comprises the following steps:
a. weighing redispersible latex powder, a defoaming agent, K12, welan gum, a water reducing agent, a plastic expanding agent, lithium carbonate and polypropylene fiber according to the weight percentage;
b. adding the raw materials weighed in the step a into ordinary portland cement for premixing to obtain premix; and weighing sulphoaluminate cement, an expanding agent, quartz sand and ceramsite sand, and uniformly mixing with the premix to obtain the anti-crack repair mortar.
Example 3 preparation of an anti-crack repair mortar according to the invention
The raw materials of the composition comprise:
20% of sulphoaluminate cement, 25% of ordinary portland cement, 5% of an expanding agent, 17.725% of quartz sand (40-70 meshes), 30% of ceramsite sand (20-40 meshes), 1.5% of redispersible latex powder, 0.02% of a defoaming agent, K120.01%, 0.005% of welan gum, 0.2% of a water reducing agent, 0.02% of a plastic expanding agent, 0.02% of lithium carbonate and 0.5% of polypropylene fibers.
The preparation method comprises the following steps:
a. weighing redispersible latex powder, a defoaming agent, K12, welan gum, a water reducing agent, a plastic expanding agent, lithium carbonate and polypropylene fiber according to the weight percentage;
b. adding the raw materials weighed in the step a into ordinary portland cement for premixing to obtain premix; and weighing sulphoaluminate cement, an expanding agent, quartz sand and ceramsite sand, and uniformly mixing with the premix to obtain the anti-crack repair mortar.
Comparative example 4 preparation of anti-crack repair mortar without the inventive formulation
The raw materials of the composition comprise:
35% of sulphoaluminate cement, 10% of ordinary portland cement, 5% of an expanding agent, 23.725% of quartz sand (40-70 meshes), 24% of ceramsite sand (20-40 meshes), 1.5% of redispersible latex powder, 0.02% of a defoaming agent, K120.01%, 0.005% of welan gum, 0.2% of a water reducing agent, 0.02% of a plastic expanding agent, 0.02% of lithium carbonate and 0.5% of polypropylene fibers.
The preparation method comprises the following steps:
a. weighing redispersible latex powder, a defoaming agent, K12, welan gum, a water reducing agent, a plastic expanding agent, lithium carbonate and polypropylene fiber according to the weight percentage;
b. adding the raw materials weighed in the step a into ordinary portland cement for premixing to obtain premix; and weighing sulphoaluminate cement, an expanding agent, quartz sand and ceramsite sand, and uniformly mixing with the premix to obtain the anti-crack repair mortar.
Comparative example 5 preparation of anti-crack repair mortar without the inventive formulation
The raw materials of the composition comprise:
15% of sulphoaluminate cement, 30% of ordinary portland cement, 5% of an expanding agent, 25.225% of quartz sand (40-70 meshes), 24% of ceramsite sand (20-40 meshes), 0% of redispersible latex powder, 0.02% of an antifoaming agent, K120.01%, 0.005% of welan gum, 0.2% of a water reducing agent, 0.02% of a plastic expanding agent, 0.02% of lithium carbonate and 0.5% of polypropylene fibers.
The preparation method comprises the following steps:
a. weighing redispersible latex powder, a defoaming agent, K12, welan gum, a water reducing agent, a plastic expanding agent, lithium carbonate and polypropylene fiber according to the weight percentage;
b. adding the raw materials weighed in the step a into ordinary portland cement for premixing to obtain premix; and weighing sulphoaluminate cement, quartz sand and ceramsite sand, and uniformly mixing with the premix to obtain the anti-crack repair mortar.
The performance of the anti-crack repair mortar prepared in the examples and the comparative examples is measured, the dry shrinkage is measured by adopting the method in JC/T603, the compression strength is measured by adopting the method in GB/T17671, the bending strength of the interface is measured by adopting the method in JC/T2381-2016, the density is measured by adopting a volumetric cylinder, and the initial setting is measured by adopting the method in GB/T1346-2019.
TABLE 1 different crack-resistant repair mortar Performance Table
From the results of the examples and comparative examples, it can be seen that: the traditional cement mortar dry density is 1800kg/m3The dry density of the repair mortar can reach 1600kg/m due to the addition of the lightweight aggregate3Left and right. The mortar is also added with a proper amount of air entraining agent, so that the wet density of the repair mortar is reduced, the light effect is achieved, and the dry density of the repair mortar is controllable within a certain range. The dry density of the repair mortar can be changed by changing the proportion of the ceramsite sand, the bonding performance (tensile bonding strength and interface bending tensile strength) of the repair mortar is improved, the setting time and the early strength of the whole repair material are adjusted by an OPC-SAC binary gelling system, and the light early-strength high-bonding-performance anti-crack repair mortar is obtained and has important practical significance.
Claims (8)
1. The anti-cracking repair mortar is characterized by comprising the following components: according to the weight percentage, the weight percentage of the alloy is,
5 to 20 percent of sulphoaluminate cement;
25 to 40 percent of ordinary Portland cement;
5 to 10 percent of calcium sulphoaluminate-calcium oxide concrete expanding agent;
20% -30% of quartz sand;
20 to 30 percent of ceramsite sand;
1 to 3 percent of redispersible latex powder;
0.01 to 0.04 percent of defoaming agent;
K12 0.005%～0.05%；
0.001 to 0.01 percent of welan gum;
0.1 to 0.3 percent of water reducing agent;
0.01 to 0.04 percent of plastic expanding agent;
0 to 0.02 percent of lithium carbonate;
0.05 to 0.2 percent of polypropylene fiber;
the sum of the weight of the components is 100 percent.
2. The anti-crack repair mortar according to claim 1, wherein: the defoaming agent is a P803 powder defoaming agent.
3. The anti-crack repair mortar according to claim 1, wherein: the water reducing agent is a powder polycarboxylic acid water reducing agent.
4. The anti-crack repair mortar according to claim 1, wherein: the particle size of the quartz sand is 40-70 meshes.
5. The anti-crack repair mortar according to claim 1, wherein: the particle size of the ceramsite sand is 20-40 meshes.
6. The method for preparing the anti-crack repair mortar according to any one of claims 1 to 5, comprising the steps of:
a. weighing redispersible latex powder, a defoaming agent, K12, welan gum, a water reducing agent, a plastic expanding agent, lithium carbonate and polypropylene fiber according to the weight percentage;
b. adding the raw materials weighed in the step a into ordinary portland cement for premixing to obtain premix; and weighing sulphoaluminate cement, an expanding agent, quartz sand and ceramsite sand, and uniformly mixing with the premix to obtain the anti-crack repair mortar.
7. The use method of the anti-crack repair mortar according to any one of claims 1 to 5, characterized by comprising the following steps:
firstly, adding water according to the water-material ratio of 0.15-0.20, then adding the anti-crack repair mortar, and stirring at a high speed for 3-5 min.
8. The use method of the anti-crack repair mortar according to claim 7, wherein: the high-speed stirring speed is 700 r/min-1200 r/min.
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| CN111875322A (en) * | 2020-08-07 | 2020-11-03 | 江苏智信达建筑科技有限公司 | Multi-component concrete composite repair mortar |
| CN112159186A (en) * | 2020-08-28 | 2021-01-01 | 郑州市王楼水泥工业有限公司 | Anti-crack repair mortar and preparation method thereof |
| CN112479657A (en) * | 2020-12-17 | 2021-03-12 | 十九冶成都建设有限公司 | Concrete crack repairing material and preparation method thereof |
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| CN103387363A (en) * | 2013-08-19 | 2013-11-13 | 湖南交泰建材有限公司 | Cement-based repair mortar |
| CN108164225A (en) * | 2017-11-30 | 2018-06-15 | 河南中建西部建设有限公司 | Fibrous type limits expansive mortar and its dry-mixed mixture, wet mixing mixture, preparation method |
| EP3239299B1 (en) * | 2016-04-25 | 2018-11-07 | Soletanche Freyssinet | Method for obtaining a cementitious mineral substance |
| CN110183193A (en) * | 2019-07-11 | 2019-08-30 | 安徽瑞和新材料有限公司 | A kind of super-early strength cement base does not disperse patching material and preparation method thereof under water |
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| CN103387363A (en) * | 2013-08-19 | 2013-11-13 | 湖南交泰建材有限公司 | Cement-based repair mortar |
| EP3239299B1 (en) * | 2016-04-25 | 2018-11-07 | Soletanche Freyssinet | Method for obtaining a cementitious mineral substance |
| CN108164225A (en) * | 2017-11-30 | 2018-06-15 | 河南中建西部建设有限公司 | Fibrous type limits expansive mortar and its dry-mixed mixture, wet mixing mixture, preparation method |
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