CN110386787B - Cement-based self-repairing agent and preparation method thereof - Google Patents
Cement-based self-repairing agent and preparation method thereof Download PDFInfo
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- CN110386787B CN110386787B CN201910705705.6A CN201910705705A CN110386787B CN 110386787 B CN110386787 B CN 110386787B CN 201910705705 A CN201910705705 A CN 201910705705A CN 110386787 B CN110386787 B CN 110386787B
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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
- C04B28/04—Portland cements
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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
- C04B2111/72—Repairing or restoring existing buildings or building materials
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
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- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a cement-based self-repairing agent and a preparation method thereof, wherein the cement-based self-repairing agent is prepared by uniformly mixing 40-70% by mass of cement, 0.3-2% by mass of welan gum powder, 0.2-1% by mass of a crosslinking agent, 0.2-1% by mass of a defoaming agent and the balance of redispersible latex powder, wherein the total mass percentage of the redispersible latex powder is 100%. The preparation method comprises the step of drying sufficient cement, redispersible latex powder, welan gum, a cross-linking agent and a defoaming agent for later use. The raw materials are weighed according to the proportion by utilizing the electronic balance and are added into a double-motion mixer one by one for mixing. Due to the fact that specific gravity of materials such as cement and welan gum is different greatly, welan gum with light specific gravity is easy to suspend above cement materials, and the mixing effect is not ideal. The full-size blade motion and the material barrel pair reverse motion of the double-motion mixer are simultaneously superposed to generate the wrapping effect, so that the 5 kinds of powder are fully mixed. And (3) taking out after mixing, putting into a sealed container, and attaching a label of the cement-based self-repairing agent so as not to be stored in a damp and direct-sunlight environment. The invention has the characteristics of strong self-repairing capability, low cost and strong operability, and has high popularization value.
Description
Technical Field
The invention relates to the technical field of concrete preparation, in particular to a cement-based self-repairing agent and a preparation method thereof.
Background
The continuous development of the national economic society puts forward higher and higher quality requirements on the building engineering, and the quality and the performance of concrete which is used as a core material of a building structure main body directly influence the safety, the service function and the service life of a building. Due to low tensile strength and bending strength and weak deformation capability, the concrete structure can crack in the forming and service processes of the concrete due to various reasons such as temperature change, load, self-contraction, environmental erosion and the like, and the crack not only influences the use function of the concrete but also greatly influences the durability of the concrete. .
The polymer-based composite material with the self-repairing function is a research hotspot in the academic and engineering circles in recent years, and the main principle is that the self-repairing mechanism of organism damage self-healing is simulated to carry out self-repairing on micro cracks which are difficult to find by naked eyes in the material processing or using process, so that a new technical means is provided for inhibiting concrete cracking. However, most of the existing concrete self-repairing agents adopt high-molecular polymer adhesives, and due to the characteristics of the physical and chemical properties of high-molecular materials, the concrete self-repairing agents often have the problems of short effective working time, poor stability and the like. In fact, since cement and other cementing materials in a system are not completely hydrated, the common concrete has weak self-repairing capability, and a cement-based self-repairing agent suitable for self-repairing concrete is developed by improving the existing materials, so that the method is an effective method for realizing the self-repairing of the concrete.
Disclosure of Invention
The invention aims to provide a cement-based self-repairing agent and a preparation method thereof.
The cement-based self-repairing agent provided by the invention is prepared by uniformly mixing cement, redispersible latex powder, welan gum, a cross-linking agent and a defoaming agent, wherein: wherein: the cement is 40-70% by mass, the welan gum powder is 0.3-2% by mass, the cross-linking agent is 0.2-1% by mass, the defoaming agent is 0.2-1% by mass, and the balance is the redispersible latex powder, wherein the total mass percentage is 100%.
In the present invention, the cement is portland cement or ordinary portland cement having a strength grade of 42.5 or more.
In the invention, the particle size of the redispersible latex powder is more than 100 meshes, the solid content is more than 98 percent, the lowest film forming temperature is less than or equal to 5 ℃, and the PH value is 6-9.
In the invention, the particle size of the welan gum powder is more than 150 meshes, and the structural framework consists of units of D-glucose, D-glucuronic acid, D-glucose and L-rhamnose.
In the invention, the cross-linking agent is TAIC type powdery cross-linking agent, and the purity is more than 99%.
In the invention, the defoaming agent is an organosilicone powder defoaming agent, and the active matter content is more than 14%.
The invention provides a preparation method of a cement-based self-repairing agent, which comprises the following specific steps:
and drying sufficient cement, redispersible latex powder, welan gum, a cross-linking agent and a defoaming agent for later use. The raw materials are weighed according to the proportion by utilizing the electronic balance and are added into a double-motion mixer one by one for mixing. Due to the fact that specific gravity of materials such as cement and welan gum is different greatly, welan gum with light specific gravity is easy to suspend above cement materials, and the mixing effect is not ideal. The full-size blade motion and the material barrel pair reverse motion of the double-motion mixer are simultaneously superposed to generate the wrapping effect, so that the 5 kinds of powder are fully mixed. And (3) taking out after mixing, putting into a sealed container, and attaching a label of the cement-based self-repairing agent so as not to be stored in a damp and direct-sunlight environment.
Compared with the prior art, the invention has the beneficial effects that: compared with the traditional polymer-based composite material and the traditional microbial repairing and repairing capsule, the cement-based self-repairing agent has the advantages of simple raw material source and lower cost, the finished product can be directly added into concrete for stirring, the later self-repairing effect is good, the operability is strong, and the popularization value is higher.
The principle can be briefly described as follows: the redispersible latex powder in the cement-based self-repairing agent is cured into a film in the hydration and self-drying processes of fresh concrete, the film forming process prevents partial cementing materials such as cement from contacting water and separates or coats the cementing materials to form a self-repairing unit, cement in the self-repairing agent provides additional cementing materials and compensates for strength loss caused by film forming of the latex powder, welan gum controls early hydration heat of the cement, a crosslinking agent promotes the film forming of the latex powder, defoaming agent eliminates the air entraining effect of the redispersible latex powder, and the balance of concrete performances is realized through the matching of various functional components in the cement-based self-repairing agent. When the latex film is broken due to cracks or defects generated in the self-repairing concrete, the coated or separated cement particles are hydrated to realize self-repairing.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
In the embodiment 1 of the invention, the cement-based self-repairing agent comprises 50 mass parts of cement, 48 mass parts of redispersible latex powder, 1 mass part of welan gum powder, 0.5 mass part of cross-linking agent and 0.5 mass part of defoaming agent.
The cement is P.O42.5 cement of the ripple source conch cement company Limited; the redispersible latex powder is ZJ universal redispersible latex powder of Jiangsu McAb building materials science and technology Limited company; the cross-linking agent is a chemical TAIC cross-linking agent of Shandong Laizhou Zhongxing; the defoaming agent is SXP-01 powder defoaming agent of Huarun chemical industry Co., Ltd.
The cement-based self-repairing agent is used in C40 self-repairing concrete, and the C40 self-repairing concrete comprises the following raw materials in parts by weight: 310 parts of cement, 100 parts of admixture (60 parts of fly ash and 40 parts of mineral powder), 41 parts of cement-based self-repairing agent, 9 parts of water reducing agent, 709 parts of sand, 1030 parts of stone and 165 parts of water; the fly ash is grade II fly ash of the Yiyang power plant; the mineral powder is Huaxin brand S95 mineral powder;
the preparation method of the C40 self-repairing concrete comprises the following steps:
(1) according to the designed strength grade C40 of the concrete, the standard mix proportion of the concrete is designed according to the steps of JGJ55 'design rule of common concrete mix proportion', and the quantities of cement, admixture, sand, stone, water and water reducing agent of each cubic concrete are shown in the table 1. Ordinary concrete was prepared as a control in the formulation of table 1.
TABLE 1C 40 concrete Standard mix ratio (kg/m)3）
| Cement | Fly ash | Mineral powder | River sand | Crushing stone | Water (W) | Water reducing agent |
| 310 | 60 | 40 | 750 | 1030 | 165 | 8 |
(2) The dosage of the cement-based self-repairing agent is (310 +60+ 40) × 10% = 41.
(3) And (3) adapting and adjusting according to the calculated amounts of the cement, the admixture, the cement-based self-repairing agent, the sand, the stone, the water and the water reducing agent by referring to JGJ55 common concrete mix proportion design rule, and finally determining the mix proportion as shown in Table 2.
TABLE 2 blend ratio (kg/m) of C40 self-repairing concrete3）
| Cement | Fly ash | Mineral powder | River sand | Crushing stone | Water (W) | Water reducing agent | Self-repairing agent |
| 310 | 60 | 40 | 709 | 1030 | 165 | 9 | 41 |
(4) Respectively weighing cement, admixture, cement-based self-repairing agent, sand, stone, water and water reducing agent according to the determined concrete mixing proportion;
(5) firstly, mixing and stirring cement, an admixture, a cement-based self-repairing agent and half of water for 35 seconds;
(6) adding sand, stone, residual water and a water reducing agent, stirring for 60 seconds to obtain C40 self-repairing concrete, molding after stirring to prepare a concrete compressive strength test piece and a concrete anti-permeability test piece, and performing standard maintenance on the test piece according to the standard.
Example 2
In the embodiment 2 of the invention, in the cement-based self-repairing agent, the mass parts of cement are 55%, the mass parts of redispersible latex powder are 43%, the mass parts of welan gum powder are 0.8%, the mass parts of a cross-linking agent are 0.4%, and the mass parts of a defoaming agent are 0.8%.
The cement is P.O42.5 cement of Zhou Zhongji Cement Co., Ltd; the redispersible latex powder is ZJ universal redispersible latex powder of Jiangsu McAb building materials science and technology Limited company; the cross-linking agent is a chemical TAIC cross-linking agent of Shandong Laizhou Zhongxing; the defoaming agent is SXP-01 powder defoaming agent of Huarun chemical Co., Ltd, Suzhou city; the mixing water is tap water in Changsha city.
The cement-based self-repairing agent is used in C30 self-repairing concrete, and the C30 self-repairing concrete comprises the following raw materials in parts by weight: 240 parts of cement, 110 parts of admixture (55 parts of fly ash and 55 parts of mineral powder), 42 parts of cement-based self-repairing agent, 8 parts of water reducing agent, 718 parts of sand, 1060 parts of stone and 168 parts of water; the fly ash is grade II fly ash of the Yiyang power plant; the mineral powder is Huaxin brand S95 mineral powder;
the cement is P.O42.5 cement of Zhou Zhongji Cement Co., Ltd; the fly ash is grade II fly ash of the Yiyang power plant; the mineral powder is Huaxin brand S95 mineral powder; the mixing water is tap water in Changsha city.
The preparation method of the C30 self-repairing concrete comprises the following steps:
(1) according to the designed strength grade C30 of the concrete, the standard mix proportion of the concrete is designed according to the steps of JGJ55 'design rule of mix proportion of common concrete', the quantities of cement, admixture, sand, stone, water and water reducing agent of each cubic concrete are shown in the table 3, and the common concrete is prepared according to the mix proportion in the table 1 and serves as a control group.
TABLE 3C 40 concrete base mix ratio (kg/m)3）
| Cement | Fly ash | Mineral powder | River sand | Crushing stone | Water (W) | Water reducing agent |
| 240 | 55 | 55 | 760 | 1060 | 168 | 7.5 |
(2) The dosage of the cement-based self-repairing agent is (240 +55+ 55) × 12% = 42.
(3) And (3) adapting and adjusting according to the calculated amounts of the cement, the admixture, the cement-based self-repairing agent, the sand, the stone, the water and the water reducing agent by referring to JGJ55 common concrete mix proportion design rule, and finally determining the mix proportion as shown in Table 2.
TABLE 4 blend ratio (kg/m) of C40 self-repairing concrete3）
| Cement | Fly ash | Mineral powder | River sand | Crushing stone | Water (W) | Water reducing agent | Self-repairing agent |
| 240 | 55 | 55 | 718 | 1060 | 168 | 8 | 42 |
(4) Respectively weighing cement, admixture, cement-based self-repairing agent, sand, stone, water and water reducing agent according to the determined concrete mixing proportion;
(5) firstly, mixing and stirring cement, an admixture, a cement-based self-repairing agent and half of water for 35 seconds;
(6) adding sand, stone, residual water and a water reducing agent, stirring for 50 seconds to obtain C40 self-repairing concrete, forming after stirring to prepare a concrete compressive strength test piece and a concrete anti-permeability test piece, and performing standard maintenance on the test piece according to the standard.
The concrete performance of the examples is detected, the test is carried out according to GB/T50081 standard for testing the mechanical property of common concrete and GB/T50082 standard for testing the long-term performance and the durability of concrete, the load is removed within 0.5 second after the compressive strength load of 28d is added to the limit load of the test piece, the secondary impermeability grade and the secondary compressive strength of 56d are that the test piece is continuously maintained to 56d after the test piece is detected for 28d, and the detection results of the secondary test are carried out, wherein the results are shown in Table 5:
TABLE 5 Performance test results
According to the detection result, compared with the common control group, the concrete strength and the anti-osmotic pressure recovery capability of the embodiment prepared by the invention are obviously higher than those of common concrete, the self-repairing capability is strong, and the embodiment is particularly suitable for underground engineering structures or building parts contacted with water and has wide application prospect.
Claims (7)
1. The cement-based self-repairing agent is characterized by being prepared by uniformly mixing cement, redispersible latex powder, welan gum, a cross-linking agent and a defoaming agent, wherein: the cement is 40-70% by mass, the welan gum powder is 0.3-2% by mass, the cross-linking agent is 0.2-1% by mass, the defoaming agent is 0.2-1% by mass, and the balance is the redispersible latex powder, wherein the total mass percentage is 100%.
2. The cement-based self-healing agent according to claim 1, wherein the cement is portland cement or ordinary portland cement having a strength rating of 42.5 or more.
3. The cement-based self-repairing agent of claim 1, wherein the particle size of the redispersible latex powder is larger than 100 meshes, the solid content is larger than 98%, the minimum film-forming temperature is less than or equal to 5 ℃, and the pH value is 6-9.
4. The cement-based self-repairing agent as claimed in claim 1, wherein the particle size of the welan gum powder is larger than 150 meshes, and the structural skeleton is composed of units of D-glucose, D-glucuronic acid, D-glucose and L-rhamnose.
5. The cement-based self-repairing agent as claimed in claim 1, wherein the cross-linking agent is TAIC type powdery cross-linking agent with purity of more than 99%.
6. The cement-based self-repairing agent according to claim 1, characterized in that the defoaming agent is an organosiloxane-based powder defoaming agent, and the content of active substances is more than 14%.
7. The preparation method of the cement-based self-repairing agent as claimed in claim 1, characterized by comprising the following specific steps:
drying sufficient cement, redispersible latex powder, welan gum, a cross-linking agent and a defoaming agent for later use; weighing the raw materials according to a proportion by using an electronic balance, and adding the raw materials into a double-motion mixer one by one for mixing; because the specific gravity difference of cement and welan gum materials is large, welan gum with light specific gravity is easy to suspend above the cement materials, so that the mixing effect is not ideal; the full-size blade motion of the double-motion mixer and the reverse motion of the charging barrel are simultaneously superposed to generate a wrapping effect, so that the cement, the redispersible latex powder, the welan gum, the cross-linking agent and the defoaming agent are fully mixed; and (3) taking out after mixing, putting into a sealed container, and attaching a label of the cement-based self-repairing agent so as not to be stored in a damp and direct-sunlight environment.
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