CN115745496A - Rapid hardening type concrete repairing material based on nano material - Google Patents
Rapid hardening type concrete repairing material based on nano material Download PDFInfo
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- CN115745496A CN115745496A CN202211595434.1A CN202211595434A CN115745496A CN 115745496 A CN115745496 A CN 115745496A CN 202211595434 A CN202211595434 A CN 202211595434A CN 115745496 A CN115745496 A CN 115745496A
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Abstract
The application relates to the technical field of building materials, and discloses a rapid hardening concrete repair material based on a nano material, which comprises the following components in parts by weight: 100 to 120 portions of cement, 120 to 140 portions of sand, 1 to 2 portions of nano silicon dioxide, 2 to 6 portions of anhydrous calcium sulphoaluminate powder, 1 to 2 portions of nano calcium carbonate powder, 0.01 to 0.06 portion of carbon nano tube, 1 to 5 portions of calcium hydroxide powder and 0.1 to 0.4 portion of water reducing agent powder. The adhesive has good bonding strength and excellent anti-permeability performance, and can be used for rapid repairing and repairing of underground engineering structures.
Description
Technical Field
The application relates to the technical field of building materials, in particular to a rapid hardening type concrete repairing material based on a nano material.
Background
At present, concrete is still one of the most widely used building materials in China, and the main building form in China is mainly a reinforced concrete structure. However, as a quasi-brittle material, the concrete material often cracks due to various factors during the early setting and hardening process and during the service life, including cracks caused by external load, concrete cracking and expansion caused by corrosion of steel bars, temperature cracks caused by external temperature change, cracks caused by creep and fatigue, aging and peeling of the material caused by external radiation, and defects of the concrete itself. It is generally believed that the destruction and collapse of the house is largely initiated by the propagation of the crack. Once the crack that reinforced concrete structure exists absorbs external moisture and gas, will make the reinforcing bar corroded by harmful ion, the reinforcing bar of corruption further causes the crack to enlarge because of the quick inflation of volume, and this effect is constantly accelerated, endangers building structure's wholeness. In addition, cracks can cause a large reduction in the load-bearing capacity, strength and durability of the structural members of the building, and even cause the structure to be damaged before the required design load-bearing capacity is achieved, thereby affecting the safety of the whole building structure. In actual engineering, the cracking condition of the concrete in the underground engineering of the rail transit is complex. The internal and external temperature difference caused by large-volume pouring can cause cracks of a concrete structure in the maintenance stage due to plastic shrinkage cracks, structural constraint and the like generated by the influence of high temperature, strong wind and the like on adverse external factors such as water evaporation, rapid loss and the like.
The concrete is required to be repaired in time by adopting a repairing material aiming at the cracking problem of the concrete in the early curing stage and the use stage, but the requirement of the current transportation junctions such as expressways, urban roads and the like on the open traffic time of the repaired cement concrete pavement is shorter and shorter, so that the repairing material is required to be short in setting and curing time, quick and early-strong, and simultaneously has good mechanical strength and durability, and the use requirement of the repairing material is met. The rapid repair materials developed at home and abroad are various in types, and are roughly classified into inorganic repair materials and organic repair materials.
However, in the process of implementing the related technical scheme, at least the following technical problems are found: the inorganic repairing material is usually special cement or common silicate cement mixed early strength agent, and is characterized by large brittleness, higher compressive strength, low tensile strength, low bonding strength and poor durability, and is easy to generate secondary damage when used for repairing cement concrete pavements. The organic repairing material is mainly epoxy resin and polyurethane, and although the organic repairing material has high bonding strength, corrosion resistance and impermeability, the organic repairing material has poor fatigue resistance and impact resistance, is easy to age, has high cost and has unsatisfactory actual repairing effect.
Disclosure of Invention
The application solves the problems of poor fatigue resistance and impact resistance and poor aging resistance of the repair material in the prior art, and the poor actual repair effect, and realizes the improvement of the reliability and safety of a concrete structure.
The application provides a rapid hardening concrete repair material based on a nano material, which comprises the following components in parts by weight: 100 to 120 portions of cement, 120 to 140 portions of sand, 1 to 2 portions of nano silicon dioxide, 2 to 6 portions of anhydrous calcium sulphoaluminate powder, 1 to 2 portions of nano calcium carbonate powder, 0.01 to 0.06 portion of carbon nano tube, 1 to 5 portions of calcium hydroxide powder and 0.1 to 0.4 portion of water reducing agent powder.
Furthermore, the addition amount of the nano silicon dioxide is 1 percent of the mass of the cement, the particle size is 10 nm-50 nm, the purity is 99 percent, and the crystal form is in an amorphous state.
Further, the water reducing agent is a polycarboxylic acid water reducing agent, the solid content of the powder is 40%, the water reducing rate is more than 32%, and the adding amount is 0.1% of the mass of the cement.
Furthermore, the addition amount of the anhydrous calcium sulphoaluminate powder accounts for 5% of the mass of the cement.
Furthermore, the particle size of the nano calcium carbonate is 10 nm-100 nm, the purity is more than 98%, the activity is more than 99%, and the addition amount of the nano calcium carbonate accounts for 1% of the mass of the cement.
Further, the inner diameter of the carbon nanotube is 3nm to 5nm, the length of the carbon nanotube is 3 to 12 microns, and the density of the carbon nanotube is 0.08g/cm 3 Specific surface area of more than 500m 2 The addition amount is 0.05 percent of the mass of the cement.
Furthermore, the addition amount of the calcium hydroxide powder is 1 percent of the mass of the cement, and the purity is more than 95 percent.
The technical scheme provided in the application at least has the following technical effects or advantages:
1. the calcium hydroxide powder serving as a calcium source can provide a large amount of soluble Ca & lt 2+ & gt to promote the rapid formation of sulphoaluminate hydration products and realize the early expansion repair effect by cooperating with cement, and in addition, the calcium hydroxide can further generate a pozzolanic reaction with active silica to promote the formation of hydrated calcium silicate gel.
2. The expansive type sulphoaluminate hydration product formed by the rapid reaction of a proper amount of calcium sulphoaluminate powder after meeting water can realize early plugging of the micro-pore passage.
3. The active silica and a large amount of hydrated calcium silicate generated by hydration reaction and pozzolanic effect in the middle and later periods of the cement-based material are beneficial to improving the durability of the repaired part, and the amorphous silica can generate further pozzolanic reaction with hydration products such as calcium hydroxide and the like, thereby being beneficial to improving the crack repair quality.
4. The carbon nano tube with a higher specific surface area and the nano calcium carbonate are used as reactive active sites to further accelerate hydration reaction, and in addition, the nano calcium carbonate has a good filling effect on micro-nano scale pores, so that the total porosity is reduced.
Drawings
FIG. 1 is a detailed view of a crack initiation test crack in example 4 of the present application;
FIG. 2 is a schematic view of a repaired fracture in example 4 of the present application;
FIG. 3 is a graph showing the relative flexural strength of test blocks before and after repair in example 4 of the present application;
Detailed Description
The technical solution of the present application will be further described with reference to the following examples. The described embodiments are illustrative of some of the present application, but are not intended to be exhaustive or to limit the scope of the application. 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 application. The examples do not show the specific conditions, and the general conditions or the conditions recommended by the manufacturer are followed. The reagents or instruments used are not indicated by the manufacturer, and are conventional products available commercially.
Example 1
A rapid hardening concrete repair material based on nano materials comprises the following components in parts by weight:
100 parts of cement;
120 parts of sand;
1 part of nano silicon dioxide;
2 parts of anhydrous calcium sulphoaluminate powder;
1 part of nano calcium carbonate powder;
0.01 part of carbon nano tube;
1 part of calcium hydroxide powder;
0.1 part of water reducing agent powder.
Wherein the particle size of the nano silicon dioxide is 10 nm-50 nm, the purity is 99%, and the crystal form is in an amorphous state. The water reducing agent is a polycarboxylic acid water reducing agent, the solid content of the powder is 40%, and the water reducing rate is more than 32%. The particle size of the nano calcium carbonate is 10 nm-100 nm, the purity is more than 98%, and the activity is more than 99%. The carbon nanotube has an inner diameter of 3-5 nm, a length of 3-12 μm, and a density of 0.08g/cm 3 Specific surface area of more than 500m 2 (ii) in terms of/g. The purity of the calcium hydroxide powder is more than 95 percent.
A preparation method of a rapid hardening concrete repair material based on a nano material comprises the following steps:
(1) Weighing the raw materials according to the formula, sequentially adding the raw materials into a mixer at normal temperature and normal pressure according to the formula amount, and uniformly mixing;
(2) Stirring for 10-20 min at the stirring speed of 300-500 r/min;
(3) On the basis of the step (2), turning the bottom powder to the upper part in a manual stirring mode, and repeating for 10-20 times;
(4) Further, stirring for 10-20 min at the stirring speed of 300-500 r/min to obtain a repair dry material;
repairing the pre-fractured test piece by adopting a newly stirred repairing material according to the following steps:
(1) Polishing treatment: and the crack area is polished, so that the rough surface is favorable for increasing the bonding area of the coating and a base surface and enhancing the adhesive force of the coating to the surface.
(2) Pasting a flow-resisting adhesive tape: adhesive tapes are pasted on two sides of the crack to be repaired to ensure the regularity of the repair, and meanwhile, the concrete surface is prevented from being polluted by overflow of the repair material.
(3) The dry material is initially mixed using a mixer. Stirring needs to be carried out for 5min along the barrel wall in a clockwise and anticlockwise crossed manner so as to ensure that the mixture is uniformly stirred;
(4) Strictly according to the powder: water =1: (0.18-0.26) the mass ratio is weight bearing to water;
(5) Weighing water, and dividing the water into 70% and 30% parts;
(6) Adding 70% of water by mass of the first part and the cement, stirring the mixture by using a stirrer, adding 30% of water by mass of the second part and the cement after stirring for 5min, and further stirring
(7) Stirring needs to be carried out for 5min along the wall of the barrel in a clockwise and anticlockwise crossed manner so as to ensure that the mixture is uniformly stirred;
(8) Stopping stirring when the temperature of the patching material reaches 38 ℃.
(9) Construction of repair material bottom slurry: before construction, the repairing area is ensured to be fully wetted, the material is uniformly coated to the crack to be repaired and the position near the crack by a scraper,
(10) Secondary brushing slurry: in order to ensure the sufficient brushing, the roller brushing is carried out for 3 times by adopting a cross roller brushing method, and the thickness of the waterproof mortar layer is ensured to be about 1-1.5 mm.
Example 2
A rapid hardening concrete repair material based on nano materials comprises the following components in parts by weight:
110 parts of cement;
130 parts of sand;
1.5 parts of nano silicon dioxide;
3.5 parts of anhydrous calcium sulphoaluminate powder;
1.5 parts of nano calcium carbonate powder;
0.035 parts of carbon nano tubes;
3 parts of calcium hydroxide powder;
0.25 part of water reducing agent powder.
Wherein the particle size of the nano silicon dioxide is 10 nm-50 nm, the purity is 99%, and the crystal form is in an amorphous state. The water reducing agent is a polycarboxylic acid water reducing agent, the solid content of the powder is 40%, and the water reducing rate is more than 32%. The particle size of the nano calcium carbonate is 10 nm-100 nm, the purity is more than 98%, and the activity is more than 99%. The carbon nanotube has an inner diameter of 3-5 nm, a length of 3-12 μm, and a density of 0.08g/cm 3 Specific surface area of more than 500m 2 (ii) in terms of/g. The purity of the calcium hydroxide powder is more than 95 percent.
The preparation method and the repair method of the repair material are adopted in the embodiment, and the specific operation steps are the same as those in the embodiment 1.
Example 3
A rapid hardening concrete repair material based on nano materials comprises the following components in parts by weight:
120 parts of cement;
140 parts of sand;
2 parts of nano silicon dioxide;
6 parts of anhydrous calcium sulphoaluminate powder;
2 parts of nano calcium carbonate powder;
0.06 part of carbon nano tube;
5 parts of calcium hydroxide powder;
0.4 part of water reducing agent powder.
Wherein the particle size of the nano silicon dioxide is 10 nm-50 nm, the purity is 99%, and the crystal form is in an amorphous state. The water reducing agent is a polycarboxylic acid water reducing agent, the solid content of the powder is 40%, and the water reducing rate is more than 32%. The particle size of the nano calcium carbonate is 10 nm-100 nm, the purity is more than 98%, and the activity is more than 99%. The carbon nanotube has an inner diameter of 3-5 nm, a length of 3-12 μm, and a density of 0.08g/cm 3 Specific surface area greater than 500m 2 (ii) in terms of/g. The purity of the calcium hydroxide powder is more than 95 percent.
The preparation method and the repair method of the repair material are adopted in the embodiment, and the specific operation steps are the same as those in the embodiment 1.
Example 4
A rapid hardening concrete repair material based on nano materials comprises the following components in parts by weight:
100 parts of cement;
120 parts of sand;
1 part of nano silicon dioxide;
5 parts of anhydrous calcium sulphoaluminate powder;
1 part of nano calcium carbonate powder;
0.05 part of carbon nano tube;
1 part of calcium hydroxide powder;
0.1 part of water reducing agent powder.
Wherein the particle size of the nano silicon dioxide is 10 nm-50 nm, the purity is 99%, and the crystal form is in an amorphous state. The water reducing agent is a polycarboxylic acid water reducing agent, the solid content of the powder is 40%, and the water reducing rate is more than 32%. The particle size of the nano calcium carbonate is 10 nm-100 nm, the purity is more than 98%, and the activity is more than 99%. The carbon nanotube has an inner diameter of 3-5 nm, a length of 3-12 μm, and a density of 0.08g/cm 3 Specific surface area of more than 500m 2 (ii) in terms of/g. The purity of the calcium hydroxide powder is more than 95 percent.
In this embodiment, the preparation method and the repair method of the repair material are adopted, and the specific operation steps are the same as those in embodiment 1.
Comparative example 1
The control test piece was prepared according to the same procedure, but only ordinary portland cement-based materials were used as the repair material.
The performance of the repair materials obtained in examples 1 to 3 and comparative example 1 was tested, specifically: as a crack-introduced test piece, a 40 × 160mm3 bending test piece was used, respectively, and the water-cement ratio was fixed to 0.45. One steel wire (diameter 0.5mm and length 15 mm) is prevented at the middle line of the die at a distance of 20mm from the top, two steel wires (d =0.5mm and length 15 cm) are placed at a height of 1cm from the tensile surface of the test piece, and crack development is controlled, so that the crack condition similar to that of the real engineering is obtained. Adopting a three-time die filling method: the thickness of the mortar is 1cm for the first time, two steel wires are placed after vibration, the mortar with the thickness of 1cm is superposed for the second time, one steel wire is placed after vibration, and finally, the mortar is completely added and vibrated. And (4) taking 3 test pieces as a group, removing the mold after 24 hours, then placing the test pieces in a standard curing box for curing, and performing a crack introduction test after the curing reaches a specified age. According to GB/T50081-2002 'test method standard for mechanical property of common concrete', relevant test tests are carried out on a WHY-1000 type microcomputer control full-automatic pressure tester.
Referring to fig. 1 to 3, it can be seen from the above test results that the rapid hardening concrete repair material method based on nano-materials provided by the present application can realize rapid and deep repair of cracks, and compared with a test block using a common repair material, the repair efficiency of a test piece repaired by the present application is improved by about 60%. According to the application, calcium hydroxide powder is used as a calcium source, so that the calcium hydroxide powder can be cooperated with cement to provide a large amount of soluble Ca & lt 2+ & gt to promote the rapid formation of sulphoaluminate hydration products, the early expansion repairing effect is realized, in addition, the calcium hydroxide can further generate a pozzolanic reaction with active silica to promote the formation of hydrated calcium silicate gel, and the durability of the repaired part is improved; the carbon nano tube with a higher specific surface area and the nano calcium carbonate are used as reactive active sites to further accelerate hydration reaction, and in addition, the nano calcium carbonate has a good filling effect on micro-nano scale pores, so that the total porosity is reduced, and the crack repairing effect is improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
The above description is only for the preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can substitute or change the technical solution and its concept of the present application within the technical scope disclosed in the present application, and shall be covered by the scope of the present application.
Claims (7)
1. A rapid hardening concrete repair material based on a nano material is characterized by comprising the following components in parts by weight: 100 to 120 portions of cement, 120 to 140 portions of sand, 1 to 2 portions of nano silicon dioxide, 2 to 6 portions of anhydrous calcium sulphoaluminate powder, 1 to 2 portions of nano calcium carbonate powder, 0.01 to 0.06 portion of carbon nano tube, 1 to 5 portions of calcium hydroxide powder and 0.1 to 0.4 portion of water reducing agent powder.
2. The rapid hardening concrete repair material based on nanomaterial according to claim 1, wherein the amount of the added nanosilicon dioxide is 1% by mass of the cement, the particle size is 10 nm-50 nm, the purity is 99% and the crystal form is amorphous.
3. The rapid hardening type concrete repair material based on nanomaterial of claim 1, wherein the water reducing agent is a polycarboxylic acid water reducing agent, the solid content of the powder is 40%, the water reducing rate is more than 32%, and the addition amount is 0.1% of the mass of the cement.
4. The rapid-hardening nano-material-based concrete repair material according to claim 1, wherein the anhydrous calcium sulfoaluminate powder is added in an amount of 5% by mass based on the cement.
5. The rapid-hardening concrete repair material based on nano-materials according to claim 1, wherein the nano-calcium carbonate has a particle size of 10nm to 100nm, a purity of more than 98%, an activity of more than 99%, and the addition amount of the nano-calcium carbonate is 1% of the mass of the cement.
6. The rapid hardening type concrete repair material based on nanomaterial of claim 1, wherein the carbon nanotube has an inner diameter of 3nm to 5nm, a length of 3 to 12 μm, and a density of 0.08g/cm 3 Specific surface area of more than 500m 2 The addition amount is 0.05 percent of the mass of the cement.
7. The nano-material based rapid hardening concrete repair material of claim 1, wherein the calcium hydroxide powder is added in an amount of 1% by mass of the cement and has a purity of more than 95%.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102898107A (en) * | 2012-10-26 | 2013-01-30 | 苏州市姑苏新型建材有限公司 | Concrete healant |
| CN110627458A (en) * | 2019-09-03 | 2019-12-31 | 中国能源建设集团甘肃省电力设计院有限公司 | High-early-strength cement-based rapid repairing material and preparation method thereof |
| CN111138137A (en) * | 2020-01-03 | 2020-05-12 | 重庆高途新材料科技有限公司 | Concrete with self-monitoring, diagnosis and repair functions and preparation method thereof |
| CN111138136A (en) * | 2020-01-03 | 2020-05-12 | 登封市嵩基水泥有限公司 | Anti-cracking cement |
| CN114455926A (en) * | 2022-02-24 | 2022-05-10 | 中国建筑科学研究院有限公司 | Cement-based rapid repair material and preparation method thereof |
| CN114751706A (en) * | 2022-05-26 | 2022-07-15 | 浙大宁波理工学院 | Concrete crack repairing material based on nano material and preparation method thereof |
-
2022
- 2022-12-13 CN CN202211595434.1A patent/CN115745496A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102898107A (en) * | 2012-10-26 | 2013-01-30 | 苏州市姑苏新型建材有限公司 | Concrete healant |
| CN110627458A (en) * | 2019-09-03 | 2019-12-31 | 中国能源建设集团甘肃省电力设计院有限公司 | High-early-strength cement-based rapid repairing material and preparation method thereof |
| CN111138137A (en) * | 2020-01-03 | 2020-05-12 | 重庆高途新材料科技有限公司 | Concrete with self-monitoring, diagnosis and repair functions and preparation method thereof |
| CN111138136A (en) * | 2020-01-03 | 2020-05-12 | 登封市嵩基水泥有限公司 | Anti-cracking cement |
| CN114455926A (en) * | 2022-02-24 | 2022-05-10 | 中国建筑科学研究院有限公司 | Cement-based rapid repair material and preparation method thereof |
| CN114751706A (en) * | 2022-05-26 | 2022-07-15 | 浙大宁波理工学院 | Concrete crack repairing material based on nano material and preparation method thereof |
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