CN110627458A - High-early-strength cement-based rapid repairing material and preparation method thereof - Google Patents
High-early-strength cement-based rapid repairing material and preparation method thereof Download PDFInfo
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- CN110627458A CN110627458A CN201910829445.3A CN201910829445A CN110627458A CN 110627458 A CN110627458 A CN 110627458A CN 201910829445 A CN201910829445 A CN 201910829445A CN 110627458 A CN110627458 A CN 110627458A
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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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
A high early strength cement-based rapid repair material is prepared from the following raw materials in parts by mass: 500-650 parts of sulphoaluminate cement, 200-400 parts of ordinary portland cement, 800-900 parts of quartz sand, 4.5-9.0 parts of nano-silica, 0.25-0.6 part of dispersing agent, 1.1-10.8 parts of water reducing agent, 0.045-0.160 part of retarder, 0.10-0.25 part of defoaming agent and 315-360 parts of water. The invention also provides a preparation method of the cement-based rapid repairing material for improving the early strength. The cement-based material is convenient and easy to prepare on site, the early and later strength is ensured by compounding the sulphoaluminate cement and the portland cement, the microstructure of a composite repairing system is obviously improved by the nano material, and the early mechanical property of the cement-based material is obviously improved; the driving quality and driving safety of the repaired road surface are ensured; the repair cost is low, and the practicability is strong.
Description
Technical Field
The invention belongs to the technical field of cement-based material application, and particularly relates to a high-early-strength cement-based rapid repair material.
Background
In recent years, with the rapid development of economy and the advance of urbanization in China, traffic transportation networks are developed more and more, so that a large number of highway projects are built in China. However, as the traffic volume is increased too fast, the damage of the traffic facilities such as roads, bridges and tunnels becomes increasingly serious, which causes great influence on the driving quality and the driving safety, wherein the cracks, the corners and the grooves on the surface of the cement concrete pavement are commonly damaged. If the defects are not repaired and treated in time, diseases can continue to develop, further serious results are caused, a large number of potential safety hazards and economic losses are brought to transportation, and pavement repair is a common and most effective repair method. In some damaged road sections with large traffic flow, in order to ensure driving safety and normal operation of roads, temporary closing is generally required to be carried out in operation gaps for rapid repair, so that it is necessary to prepare a rapid-hardening and high-early-strength cement-based rapid repair material.
Nanotechnology is currently showing a vigorous trend as a new and advanced technology. The nano material has an ultra-fine special structure and shows a plurality of excellent performances such as a small-size effect of crystal grains, an interface effect, a quantum size effect and the like. The nano material is doped into the cement-based repairing material, so that the cement hydration can be promoted, the bonding gap between hydration products can be filled, and the interface structure of the set cement and the aggregate is improved, so that the mechanical property of the cement-based material is obviously improved.
Chinese patent application CN108546071A discloses a concrete pavement patching material capable of shortening the setting time. The repair material has high strength, and can shorten the setting time and improve the working efficiency. But compared with special cement, the Portland cement-based material does not reach the early strength of some special requirements.
The Chinese patent application CN107759160A discloses a chemical anticorrosion repair material for concrete product surface cracks and a preparation method and a construction method thereof. The repairing material can repair the cracks well and prevent the concrete products with cracks from being corroded continuously. The repairing material of the invention also has good impermeability, and can prevent water from permeating into cracks to continuously corrode the interior of the concrete product, thereby prolonging the service life of the concrete product. However, the repair material has high dispersibility, poor aging resistance and low moist heat resistance.
The Chinese patent application CN108083735A provides a repair material for quickly repairing a road surface, and a preparation method and application thereof. The repairing material is suitable for repairing cracks and joints of a cement concrete pavement under extremely cold weather conditions, can be used for traffic within 0.5 hour after the pavement is repaired, and can greatly shorten the traffic opening time. However, the preparation process of the repair material is complicated, the in-situ preparation and construction are difficult, and the silicate cement-based material is seriously dried and shrunk in the later period, so that the repair can be carried out for many times.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a cement-based rapid repair material with high early strength, which is convenient and easy to prepare on site, can obviously improve the mechanical property of the cement-based rapid repair material, and overcomes the defects of insufficient early strength and reversed late strength of the cement-based rapid repair material; the invention also provides a preparation method of the cement-based rapid repair material with high early strength.
The technical scheme adopted by the invention is as follows: a high early strength cement-based rapid repair material is prepared from the following raw materials in parts by mass: 500-650 parts of sulphoaluminate cement, 200-400 parts of ordinary portland cement, 800-900 parts of quartz sand, 4.5-9.0 parts of nano-silica, 0.25-0.6 part of dispersing agent, 1.1-10.8 parts of water reducing agent, 0.045-0.160 part of retarder, 0.10-0.25 part of defoaming agent and 315-360 parts of water.
In order to fill the bonding gaps among hydration products, further improve the interface structure of the set cement and the aggregate and improve the early and later mechanical properties of the cement-based material, the raw material also comprises 4.5-9.0 parts of nano calcium carbonate.
Further, the nano-silica has a specific surface area (BET) of 300m2A/g hydrophilic fumed nano-silica.
Further, the nano calcium carbonate has a specific surface area (BET) of>80m2Powder nano calcium carbonate per gram.
Further, the water reducing agent is a naphthalene water reducing agent or a polycarboxylic acid water reducing agent.
Further, the air conditioner is provided with a fan,the retarder is sodium gluconate or borax (Na)2B4O7·10H2O）。
Further, the defoaming agent is butyl triphosphate.
Further, the dispersing agent is sodium tripolyphosphate.
Furthermore, the sulphoaluminate cement is quick-hardening sulphoaluminate cement with the strength grade of 42.5, and the Portland cement is P.O 42.5 cement.
Furthermore, the quartz sand is high-purity quartz sand with the grain size of 20-40 meshes.
A preparation method of a cement-based rapid repair material with high early strength comprises the following steps:
firstly, dispersing the nano material according to the proportion requirement, firstly dissolving a dispersing agent in 65wt% of water, adding the nano material and uniformly stirring, then stirring for 30min by using a high-speed shearing machine, and then ultrasonically dispersing the stirred nano material solution in an ultrasonic disperser for 45min to finally obtain uniformly dispersed nano material dispersion liquid.
Step two, uniformly stirring sulphoaluminate cement, ordinary portland cement and quartz sand at 300-600 rpm according to the mixture ratio requirement to obtain a main material mixture;
adding the rest water, the nano-material dispersion liquid, the water reducing agent, the retarder and the defoaming agent into the mixture obtained in the step two, and stirring at 300-600 rpm for 1 minute until the mixture is uniform;
and step four, increasing the rotating speed to 1000-1500 rpm, and stirring for 2 minutes to obtain the cement-based repairing material.
And finally, pouring the cement-based repairing material to the position of the cement pavement needing repairing for maintenance.
The invention has convenient and easy on-site preparation, ensures the early strength and the later strength by compounding the sulphoaluminate cement and the portland cement, and can obviously improve the microstructure of a composite repairing system by doping the nano silicon dioxide and the nano calcium carbonate, thereby obviously improving the early mechanical property of the cement-based material; in addition, the nano silicon dioxide is used as an activating agent for promoting the volcanic ash effect and is used as a C-S-H nucleation site to promote further hydration of the cement-based patching material, so that the mechanical property of the system is improved, and the driving quality and the driving safety of the repaired pavement are ensured; the method is particularly suitable for cement-based repair engineering with large traffic flow and needing quick repair of damaged road sections, and has the advantages of low repair cost, large market space and strong practicability.
Compared with the prior art, the invention has the following beneficial effects: the cement-based rapid repair material is composed of a matrix of a silicate cement and sulfate cement complex system in a proper proportion, a large amount of ettringite can be generated in the early stage of system hydration, and the alkalinity of the system is proper, so that the ettringite can stably exist. Therefore, the binary system has the advantages of lower porosity, rapid setting and hardening, shrinkage compensation, and excellent performance of stable increase of later strength.
In addition, the application of the nano material in the cement-based material can reduce the total porosity of the cement-based material and obviously improve the microstructure of the cement-based material by taking the nano silicon dioxide and the nano calcium carbonate as the fillers, thereby obviously improving the early mechanical property of the cement-based material; on the other hand, the nano silicon dioxide is an activator for promoting the volcanic ash effect and is used as a C-S-H nucleation site to promote the further hydration of the cement-based material.
The added dispersant can enable the nano material to be uniformly dispersed in water without coagulation and agglomeration, properly delays the setting time by compounding the water reducing agent and the retarder, improves the fluidity of slurry, and is easy for field construction.
Detailed Description
The present invention is further illustrated in detail below with reference to examples, each of which is an experimental example and provides real performance test data.
Example 1; preparing the following components: 623.7g of sulphoaluminate cement, 267.3g of ordinary portland cement, 315g of water, 9.0g of nano silicon dioxide, 0.27g of sodium tripolyphosphate, 1.74g of polycarboxylic acid water reducing agent, 1.23g of borax, 2.25g of butyl triphosphate and 900g of quartz sand.
The raw materials are prepared into the cement-based rapid repair material for improving the early strength according to the following steps:
a. dissolving sodium tripolyphosphate in 65wt% water, adding nano silicon dioxide, stirring uniformly, stirring for 30min by using a high-speed shearing machine, and then ultrasonically dispersing the stirred nano silicon dioxide solution in an ultrasonic disperser for 45min to obtain uniformly dispersed nano silicon dioxide dispersion liquid; b. mixing sulphoaluminate cement, ordinary portland cement and quartz sand uniformly at 300rpm to obtain a main material mixture; c. adding the nano silicon dioxide dispersion liquid, the residual water, the polycarboxylic acid water reducing agent, the borax and the butyl triphosphate into the main material mixture, and stirring for 1 minute at 500 rpm; then the rotation speed is increased to 1200rpm, the mixture is stirred for 2 minutes, and finally the mixture is cast, molded and cured in a mold.
The initial setting time of the cement-based repair material obtained in the embodiment is 18min, the final setting time is 25min, and the compressive strengths of the cement-based repair material obtained in the embodiment under standard conditions for 2h, 6h, 1d and 28d are 27MPa, 36MPa, 51MPa and 88MPa respectively.
Example 2; preparing the following components: 617.4g of sulphoaluminate cement, 264.6g of ordinary portland cement, 360g of water, 9g of nano-silica, 9g of nano-calcium carbonate, 0.54g of sodium tripolyphosphate, 1.53g of polycarboxylic acid water reducing agent, 1.19g of borax, 2.25g of butyl triphosphate and 900g of quartz sand.
a. Dissolving sodium tripolyphosphate in 65wt% of water, adding nano silicon dioxide and nano calcium carbonate, uniformly stirring, stirring for 30min by using a high-speed shearing machine, and ultrasonically dispersing the stirred nano silicon dioxide solution in an ultrasonic dispersion instrument for 45min to obtain uniformly dispersed nano dioxygen material dispersion liquid; b. mixing sulphoaluminate cement, ordinary portland cement and quartz sand uniformly at 600rpm to obtain a main material mixture; c. adding the nano silicon dioxide dispersion liquid, the residual water, the polycarboxylic acid water reducing agent, the borax and the butyl triphosphate into the main material mixture, and stirring for 1 minute at 600 rpm; then the rotating speed is increased to 1500rpm, the mixture is stirred for 2 minutes, and finally the mixture is cast, molded and cured in a mold.
The initial setting time of the cement-based repair material obtained in the embodiment is 21min, the final setting time is 28min, and the compressive strengths of the cement-based repair material obtained in the embodiment under standard conditions of 2h, 6h, 1d and 28d are 21MPa, 32MPa, 48MPa and 78MPa respectively.
Example 3; preparing the following components: 623.7g of sulphoaluminate cement, 267.3g of ordinary portland cement, 315g of water, 9g of nano silicon dioxide, 0.27g of sodium tripolyphosphate, 1.53g of polycarboxylic acid water reducing agent, 0.45g of sodium gluconate, 2.25g of butyl triphosphate and 900g of quartz sand.
The raw materials are prepared into the cement-based rapid repair material for improving the early strength according to the following steps: a. the same as example 1; b. mixing sulphoaluminate cement, ordinary portland cement and quartz sand uniformly at 450rpm to obtain a main material mixture; c. adding the nano silicon dioxide dispersion liquid, the residual water, the polycarboxylic acid water reducing agent, the borax and the butyl triphosphate into the main material mixture, and stirring for 1 minute at 600 rpm; then the rotation speed is increased to 1200rpm, the mixture is stirred for 2 minutes, and finally the mixture is cast, molded and cured in a mold.
The initial setting time of the cement-based repair material obtained in the embodiment is 19min, the final setting time is 25min, and the compressive strengths of the cement-based repair material obtained in the embodiment under standard conditions of 2h, 6h, 1d and 28d are 27MPa, 33MPa, 51MPa and 81MPa respectively. The mechanical property of the cement-based rapid repair material is obviously improved, and the driving quality and driving safety of the repaired pavement are ensured.
Example 4; preparing the following components: 579.2g of sulphoaluminate cement, 311.9g of ordinary portland cement, 315g of water, 4.5g of nano-silica, 4.5g of nano-calcium carbonate, 0.27g of sodium tripolyphosphate, 1.35g of polycarboxylic acid water reducing agent, 1.15g of borax, 1.95g of butyl triphosphate and 800g of quartz sand.
The method for preparing the cement-based rapid repair material with improved early strength from the raw materials is the same as that of example 1.
The initial setting time of the cement-based patching material obtained in the embodiment is 20min, the final setting time is 25min, and the compressive strengths of the cement-based patching material under standard conditions for 2h, 6h, 1d and 28d are respectively 25MPa, 33MPa, 46MPa and 81 MPa.
Example 5; preparing the following components: 573.3g of sulphoaluminate cement, 308.7g of ordinary portland cement, 360g of water, 9g of nano-silica, 9g of nano-calcium carbonate, 0.54g of sodium tripolyphosphate, 1.15g of polycarboxylic acid water reducing agent, 0.95g of borax, 1.95g of butyl triphosphate and 850g of quartz sand.
The method for preparing the cement-based rapid repair material with improved early strength from the raw materials is the same as that of example 2.
The initial setting time of the cement-based repair material obtained in the embodiment is 19min, the final setting time is 31min, and the compressive strengths of the cement-based repair material obtained in the embodiment under standard conditions of 2h, 6h, 1d and 28d are respectively 18MPa, 31MPa, 45MPa and 73 MPa. The mechanical property of the cement-based rapid repair material is obviously improved, and the driving quality and driving safety of the repaired pavement are ensured.
Example 6; preparing the following components: 534.6g of sulphoaluminate cement, 356.4g of ordinary portland cement, 315g of water, 9g of nano silicon dioxide, 0.27g of sodium tripolyphosphate, 1.35g of polycarboxylic acid water reducing agent, 0.37g of sodium gluconate, 1.95g of butyl triphosphate and 800g of quartz sand.
The method for preparing the cement-based rapid repair material with improved early strength from the raw materials is the same as that of example 3.
The initial setting time of the cement-based repair material obtained in the embodiment is 20min, the final setting time is 28min, and the compressive strengths of the cement-based repair material obtained in the embodiment under standard conditions of 2h, 6h, 1d and 28d are 21MPa, 33MPa, 44MPa and 76MPa respectively. The mechanical property of the cement-based rapid repair material is obviously improved, and the driving quality and driving safety of the repaired pavement are ensured.
Example 7; preparing the following components: 534.6g of sulphoaluminate cement, 356.4g of ordinary portland cement, 315g of water, 4.5g of nano-silica, 4.5g of nano-calcium carbonate, 0.27g of sodium tripolyphosphate, 10.8g of naphthalene water reducing agent, 1.43g of borax, 0.95g of butyl triphosphate and 800g of quartz sand.
The raw materials are prepared into the cement-based rapid repair material for improving the early strength according to the following steps: a. the same as example 2; b. the same as example 1; c. adding the nano material dispersion liquid, water, sodium tripolyphosphate, a naphthalene water reducing agent, borax and butyl triphosphate into the main material mixture, and uniformly stirring at 500 rpm; and then increasing the rotating speed to 1500rpm, stirring for 1-2 minutes, and finally casting and molding the mixture, filling the mixture into a mold and curing.
The initial setting time of the cement-based repair material obtained in the embodiment is 19min, the final setting time is 31min, and the compressive strengths of the cement-based repair material obtained in the embodiment under standard conditions for 2h, 6h, 1d and 28d are respectively 18MPa, 31MPa, 45MPa and 72 MPa.
Claims (10)
1. The cement-based rapid repair material with high early strength is characterized by being prepared from the following raw materials in parts by mass: 500-650 parts of sulphoaluminate cement, 200-400 parts of ordinary portland cement, 800-900 parts of quartz sand, 4.5-9.0 parts of nano-silica, 0.25-0.6 part of dispersing agent, 1.1-10.8 parts of water reducing agent, 0.045-0.160 part of retarder, 0.10-0.25 part of defoaming agent and 315-360 parts of water.
2. The high early strength cement-based rapid repair material of claim 1, wherein: the raw material also comprises 4.5-9.0 parts of nano calcium carbonate.
3. A high early strength cement-based rapid repair material as claimed in claim 2, wherein: the nano calcium carbonate has specific surface area>80m2Powder nano calcium carbonate per gram.
4. A high early strength cement-based rapid repair material as claimed in claim 1, 2 or 3, wherein: the nano silicon dioxide has a specific surface area of 300m2A/g hydrophilic fumed nano-silica.
5. The high early strength cement-based rapid repair material of claim 4, wherein: the water reducing agent is a naphthalene water reducing agent or a polycarboxylic acid water reducing agent.
6. The high early strength cement-based rapid repair material of claim 5, wherein: the retarder is sodium gluconate or borax (Na)2B4O7·10H2O）。
7. The high early strength cement-based rapid repair material of claim 6, wherein: the defoaming agent is butyl triphosphate; the dispersant is sodium tripolyphosphate.
8. The high early strength cement-based rapid repair material of claim 7, wherein: the sulphoaluminate cement is rapid hardening sulphoaluminate cement with the strength grade of 42.5, and the Portland cement is P.O 42.5 cement.
9. The high early strength cement-based rapid repair material of claim 8, wherein: the quartz sand is high-purity quartz sand with the grain size of 20-40 meshes.
10. A preparation method of a cement-based rapid repairing material with high early strength is characterized by comprising the following steps:
firstly, dispersing the nano material according to the proportion requirement, firstly dissolving a dispersing agent in 65wt% of water, adding the nano material and uniformly stirring, then stirring for 30min by using a high-speed shearing machine, and then ultrasonically dispersing the stirred nano material solution in an ultrasonic disperser for 45min to finally obtain uniformly dispersed nano material dispersion liquid;
step two, uniformly stirring sulphoaluminate cement, ordinary portland cement and quartz sand at 300-600 rpm according to the mixture ratio requirement to obtain a main material mixture;
adding the rest water, the nano-material dispersion liquid, the water reducing agent, the retarder and the defoaming agent into the mixture obtained in the step two, and stirring at 300-600 rpm for 1 minute until the mixture is uniform;
and step four, increasing the rotating speed to 1000-1500 rpm, and stirring for 2 minutes to obtain the cement-based repairing material.
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| CN111747713A (en) * | 2020-07-30 | 2020-10-09 | 贵州省交通规划勘察设计研究院股份有限公司 | Early-strength self-leveling concrete pavement rapid repairing material and preparation method thereof |
| CN112279584A (en) * | 2020-10-12 | 2021-01-29 | 浙江永坚新材料科技股份有限公司 | Rapid repair concrete prepared from waterworks sludge powder and method |
| CN112321241A (en) * | 2020-06-08 | 2021-02-05 | 上海艺盛实业有限公司 | Masterbatch for quickly repairing concrete road and concrete road repairing material |
| CN112479669A (en) * | 2020-12-22 | 2021-03-12 | 汝州市东江建筑工业科技有限公司 | Concrete damage repairing cement-based material for prefabricated part and application thereof |
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| CN111747713A (en) * | 2020-07-30 | 2020-10-09 | 贵州省交通规划勘察设计研究院股份有限公司 | Early-strength self-leveling concrete pavement rapid repairing material and preparation method thereof |
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| CN113716890A (en) * | 2021-09-22 | 2021-11-30 | 合肥市前沿表面活性物质科学研究有限公司 | Compound concrete retarding and water reducing agent and production method and application thereof |
| CN114133192A (en) * | 2021-11-29 | 2022-03-04 | 上海市建筑科学研究院有限公司 | High-strength rapid repairing material special for airport runway |
| CN114213042A (en) * | 2021-12-27 | 2022-03-22 | 南京科工煤炭科学技术研究有限公司 | Double-fast sulphoaluminate cement for fast setting and fast strengthening in severe cold environment and preparation method and use method thereof |
| CN114213042B (en) * | 2021-12-27 | 2023-02-17 | 南京科工煤炭科学技术研究有限公司 | Double-fast sulphoaluminate cement for fast setting and fast strengthening in severe cold environment and preparation method and use method thereof |
| CN114276114A (en) * | 2021-12-30 | 2022-04-05 | 北京易晟元环保工程有限公司 | Early-strength rapid-hardening anti-permeability crack repairing material |
| CN114180874A (en) * | 2021-12-31 | 2022-03-15 | 四川赢盛化工有限公司 | Additive composition agent of powder rapid repair material and application of additive composition agent in cement concrete |
| CN115745496A (en) * | 2022-12-13 | 2023-03-07 | 中铁四局集团第四工程有限公司 | Rapid hardening type concrete repairing material based on nano material |
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