Ultrahigh performance prestressed duct grouting material and preparation method thereof

Abstract

The application discloses a kind of super high performance prestressed duct grouting material and preparation method thereof, it is related to prestressed duct grouting material field, wherein, super high performance prestressed duct grouting material includes the following weight parts of component: cement 60~80 parts, slag powder 1~8 parts, zeolite powder 2~12 parts, quartz powder 2~15 parts, microbead 5~15 parts, water reducing agent 0.2~4 parts, expanding agent 0~4 parts, defoaming agent 0.05~0.5 parts, stabilizer 0~0.1 part;The sum of weight parts of above-mentioned component is 100 parts.The implementation of the present application can improve the bleeding property, workability, fluidity and strength of prestressed duct grouting material.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of prestressed duct grouting material, in particular to an ultra-high performance prestressed duct grouting material and a preparation method thereof. BACKGROUND

[0002] Bridges, as an important part of traffic construction, can effectively promote the connection between regions. With the increasing requirement of bridge construction on strength and durability, the application of post-tensioning prestressed technology is also increasing. Prestressed duct grouting material not only plays a role in wrapping and protecting the prestressed tendon, improving the durability of the prestressed tendon, but also connects the prestressed tendon and the bridge main body as a whole, improving the structural integrity.

[0003] Traditional prestressed duct grouting material is mixed by cement and certain admixtures, and its working performance, mechanical properties, bleeding performance, etc. should meet the requirements of "Highway Bridge and Culvert Construction Technical Specification" (JTG / T 3650-2020). With the development of bridge construction towards high strength and high durability, the application of special high-performance materials such as ultra-high performance concrete is increasing, and ordinary grouting material cannot match the ultra-high performance structure well, so it is urgent to develop an ultra-high performance prestressed duct grouting material, which is of great significance to ensure the coordination of ultra-high strength bridge structure and fully play its high strength and high durability. SUMMARY

[0004] The technical problem to be solved by the present application is to provide an ultra-high performance prestressed duct grouting material with high strength and durability.

[0005] The technical problem to be solved by the present application is to provide an ultra-high performance prestressed duct grouting material with high strength and durability.

[0006] To solve the above technical problems, the present application provides an ultra-high performance prestressed duct grouting material, which comprises the following components by weight: cement 60-80 parts, slag powder 1-8 parts, zeolite powder 2-12 parts, quartz powder 2-15 parts, microbeads 5-15 parts, water reducing agent 0.2-4 parts, expanding agent 0-4 parts, defoaming agent 0.05-0.5 parts, stabilizer 0-0.1 parts.

[0007] The sum of the weight parts of each component is 100 parts.

[0008] As an improvement of the above technical solution, the weight ratio of alkali earth metal oxide RO to alkali metal oxide R2O in the zeolite powder is (5-10):1.

[0009] As an improvement of the above technical solution, in the zeolite powder, CaO+MgO+BaO=10-20wt%, Na2O+K2O=0.5-5wt%, SiO2≤55wt%, Al2O3≥8wt%.

[0010] As the improvement of the above technical scheme, in the microbead, CaO+MgO=15-30wt%, SiO2+Al2O3=40-60wt%.

[0011] As the improvement of the above technical scheme, the loss on ignition of the microbead at 250℃ is ≤1.2wt%.

[0012] As the improvement of the above technical scheme, the average particle size of the microbead is 5-10μm.

[0013] As the improvement of the above technical scheme, the cement is Portland cement, and the strength grade is 42.5 or 52.5.

[0014] As the improvement of the above technical scheme, the slag powder is selected from S95 grade slag powder and / or S105 grade slag powder.

[0015] The fineness of the quartz powder is 120-1000 mesh.

[0016] As the improvement of the above technical scheme, the water reducing agent is selected from one or more of aliphatic water reducing agent, polycarboxylic acid water reducing agent and sulfonate water reducing agent.

[0017] The expanding agent is selected from sulphoaluminate expanding agent and / or magnesium oxide expanding agent.

[0018] The defoaming agent is selected from polysiloxane defoaming agent and / or polyether defoaming agent.

[0019] The stabilizer is cellulose ether stabilizer.

[0020] Correspondingly, the application also discloses a preparation method of the super high performance prestressed hole grouting material.

[0021] The cement, slag powder, zeolite powder, quartz powder, microbead, water reducing agent, expanding agent, defoaming agent and stabilizer are mixed according to the formula to obtain the super high performance prestressed hole grouting material.

[0022] The formula includes the following components in weight parts:

[0023] The cement is 60-80 parts, the slag powder is 1-8 parts, the zeolite powder is 2-12 parts, the quartz powder is 2-15 parts, the microbead is 5-15 parts, the water reducing agent is 0.2-4 parts, the expanding agent is 0-4 parts, the defoaming agent is 0.05-0.5 parts and the stabilizer is 0-0.1 part.

[0024] The sum of the weight parts of the components is 100 parts.

[0025] The application has the following beneficial effects:

[0026] 1. The super high performance prestressed duct grouting material of the application introduces slag powder, zeolite powder, quartz powder and microbeads in the formula, and through the synergy of the above, the bleeding property, workability, fluidity and strength of the prestressed duct grouting material are improved.

[0027] 2. The application effectively improves the fluidity of the prestressed duct grouting material at low temperature (≤0℃) through the control of the zeolite powder component, microbead component and slag grade and quartz powder particle size, and guarantees the zero bleeding effect, realizes the good adhesion with the steel bar and guarantees the later strength. The prestressed grouting material of the application can adapt to low temperature environment. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the application more clear, the application will be further described in detail below with specific embodiments.

[0029] The application provides a super high performance prestressed duct grouting material, which comprises the following components by weight:

[0030] Cement 60-80 parts, slag powder 1-8 parts, zeolite powder 2-12 parts, quartz powder 2-15 parts, microbeads 5-15 parts, water reducing agent 0.2-4 parts, expanding agent 0-4 parts, defoaming agent 0.05-0.5 parts, stabilizer 0-0.1 parts; the sum of the weight parts of the above components is 100 parts.

[0031] The cement can cement the components in the prestressed duct grouting material and form strength. In the application, the cement can be portland cement or sulphoaluminate cement, but is not limited to this, and the preferred one is portland cement. The strength grade of the cement is 42.5 grade or 52.5 grade, but is not limited to this. Specifically, in the formula of the super high performance prestressed duct grouting material of the application, the amount of cement is 60-80 parts, and the exemplary ones are 62 parts, 65 parts, 69 parts, 73 parts or 78 parts, but are not limited to this.

[0032] The slag powder is a kind of powder material obtained by grinding granulated blast furnace slag to a specified fineness, and has high potential activity. It can perform hydration reaction under alkaline excitation conditions, and can generate secondary hydration reaction with Ca(OH)2 precipitated by cement hydration to generate C-S-H hydrate, which greatly improves the compressive strength. In addition, the slag powder surface has glassiness, which has micro aggregate effect and pozzolanic effect, and can adjust and improve the working performance and bleeding property of the duct grouting material. Specifically, in the formula of the super high performance prestressed duct grouting material of the application, the grade of the slag powder is not less than S95 grade, and specifically, S95 grade or S105 grade can be selected, but is not limited to this. The amount of slag powder is 1-8 parts, and the exemplary ones are 3 parts, 4 parts, 5 parts or 7 parts, but are not limited to this.

[0033] The zeolite powder is obtained by grinding natural zeolite, has higher fineness than cement, high pozzolanic activity, and helps to improve the mechanical properties of the duct grout and reduce shrinkage. Specifically, in the formula of the super high performance prestressed duct grout, the amount of zeolite powder is 2-12 parts, for example, 3 parts, 5 parts, 7 parts or 10 parts, but not limited to this.

[0034] Preferably, in one embodiment of the present application, the weight ratio of alkaline earth metal oxide RO to alkali metal oxide R2O in the zeolite powder is (5-10):1. The zeolite powder based on this component has better pore volume and pore size, which can adsorb water after being incorporated into the prestressed duct grout, change the surface tension state, so that the water does not solidify at a lower temperature, thereby imparting better workability to the prestressed duct grout at a lower temperature. The alkaline earth metal includes MgO, CaO, BaO or SrO, but is not limited to this. The alkali metal oxide includes Na2O, K2O, but is not limited to this. More preferably, CaO+MgO+BaO=10-20wt%, Na2O+K2O=0.5-5wt%, SiO2≤55wt%, Al2O3≥8wt% in the zeolite powder.

[0035] The microbeads are microbeads obtained by flotation of fly ash, which have spherical or ellipsoidal micro-morphology, high activity, high compressive strength, good fluidity and other characteristics, which are beneficial to improve the workability and mechanical properties of the grout. Specifically, in the formula of the super high performance prestressed duct grout, the amount of microbeads is 5-15 parts, for example, 5 parts, 8 parts, 11 parts or 14 parts, but not limited to this. The average particle size of the microbeads is 5-10 μm, for example, 5.5 μm, 6 μm, 7 μm, 7.5 μm, 8.5 μm or 9 μm, but not limited to this.

[0036] Preferably, in one embodiment of the present application, the amount of CaO+MgO in the microbeads is controlled to be 15-30wt%, and the amount of SiO2+Al2O3 is controlled to be 40-60wt%. The microbeads based on this chemical composition have a solid or semi-solid spherical micro-morphology, which can greatly improve the fluidity of the prestressed duct grout at low temperature. More preferably, the ignition loss of the microbeads at 250°C is ≤1.2wt%, the content of gypsum phase in such microbeads is low, and the smoothness of the microbead surface is high, which can better improve the fluidity of the prestressed duct grout at low temperature.

[0037] It should be noted that although the introduction of zeolite can improve the working performance of the prestressed duct grouting material at low temperature, the water absorption of zeolite is relatively high, and the addition of zeolite to the prestressed duct grouting material will cause the water used for lubricating the particles to decrease, and in addition to the large specific surface area of zeolite itself, the friction between the particles will increase, which will eventually lead to a decrease in the fluidity of the prestressed duct grouting material, especially at low temperature. Therefore, the present application introduces microbeads of a specific chemical component into the formula of the prestressed duct grouting material to improve the fluidity and ensure the working performance at low temperature.

[0038] The quartz powder is a powder processed from quartz stone, and the main mineral component is SiO2. The quartz powder is hard in texture and stable in chemical properties, has a micro-aggregate effect, and can play a role in skeleton support to improve the mechanical properties of the grouting material. Specifically, in the formula of the ultra-high performance prestressed duct grouting material of the present application, the fineness of the quartz powder is 120-1000 mesh, and the amount of the quartz powder is 2-15 parts, for example, 3 parts, 6 parts, 8 parts, 10 parts or 13 parts, but not limited thereto.

[0039] The water reducing agent can help reduce water consumption, improve fluidity, and reduce segregation, and one or more of aliphatic water reducing agent, polycarboxylic acid water reducing agent, and sulfonate water reducing agent can be selected, but not limited thereto. The amount of the water reducing agent is 0.2-4 parts, for example, 0.5 parts, 1 part, 2 parts, 3 parts or 3.5 parts, but not limited thereto.

[0040] The expansion agent can help reduce shrinkage and improve expansion rate, and one or more of sulphoaluminate expansion agent, aluminate expansion agent or magnesium oxide expansion agent can be selected, for example, calcium sulphoaluminate, magnesium oxide, plastic expansion agent (bauxite mineral as the main material, sintered at 1700℃ in nitrogen atmosphere in the presence of carbon and calcium oxide, and then ground to form a yellow powder), but not limited thereto. The amount of the expansion agent is 0-4 parts, for example, 0.5 parts, 1.5 parts, 2.5 parts, 3 parts or 3.5 parts, but not limited thereto.

[0041] The defoaming agent can help reduce the surface tension of the grouting material slurry and reduce the generation of air bubbles, and polysiloxane defoaming agent and / or polyether defoaming agent can be selected; for example, polysiloxane, silicone modified defoaming agent, polyether defoaming agent or polyether modified silicone defoaming agent, but not limited thereto. The amount of the defoaming agent is 0.05-0.5 parts, for example, 0.1 parts, 0.2 parts, 0.25 parts, 0.35 parts or 0.45 parts, but not limited thereto.

[0042] The stabilizer helps to reduce the segregation of the pressure grouting material slurry and reduce the bleeding rate, and the cellulose ether stabilizer can be selected, such as hydroxyethyl cellulose ether, hydroxypropyl methyl cellulose ether, and hydroxyethyl methyl cellulose ether, but is not limited thereto. The amount of the stabilizer is 0-0.1 parts, and the amount of the stabilizer is exemplarily 0 parts, 0.02 parts, 0.04 parts, 0.07 parts, or 0.09 parts, but is not limited thereto.

[0043] Correspondingly, the application also discloses a preparation method of the super high performance prestressed duct pressure grouting material.

[0044] Specifically, the mixing process is as follows: the premixing equipment is stirred at a speed of 50 revolutions per second for 360 seconds, and then the mixture is bagged.

[0045] Preferably, in use, the super high performance prestressed duct pressure grouting material is mixed with water according to a water-binder ratio of 0.26.

[0046] The application is described below with specific examples:

[0047] Example 1

[0048] The example provides a super high performance prestressed duct pressure grouting material, and the formula of the super high performance prestressed duct pressure grouting material is as follows:

[0049] P·Ⅱ52.5R cement 70 parts, S95 grade slag powder 6 parts, zeolite powder 6 parts, quartz powder 8 parts, microbeads 7 parts, polycarboxylic acid type water reducing agent 1.2 parts, calcium sulphoaluminate expansive agent 1.5 parts, polyether modified organic silicon defoaming agent 0.25 parts, and hydroxypropyl methyl cellulose ether stabilizer 0.05 parts.

[0050] In the zeolite powder, CaO+MgO+BaO=16.8wt%, Na2O+K2O=2.3wt%, SiO2 is 48.3wt%, and Al2O3 is 10.7wt%. The rest is Fe2O3 3.2wt%, and LOI is 18.7% (after calcination at 1000℃).

[0051] In the microbeads, CaO+MgO=27.5wt%, SiO2+Al2O3=58.4wt%, the rest is Fe2O3 1.7wt%, TiO2 0.9wt%, Na2O 1.1wt%, K2O 1.2wt%, and LOI 9.2% (1000℃). The loss on ignition of the microbeads at 250℃ is 0.3wt%. The average particle size of the microbeads is 5.3μm.

[0052] The particle size of the quartz powder is 800-1000 mesh.

[0053] The preparation method is: weighing each raw material according to the formula, and fully mixing each raw material uniformly.

[0054] Example 2

[0055] The present embodiment provides a kind of super high performance prestressed hole pressure slurry, and its formula is:

[0056] P·Ⅱ52.5R cement 65 parts, S95 grade slag powder 6 parts, zeolite powder 11 parts, quartz powder 8 parts, microbead 7 parts, polycarboxylic acid type water reducing agent 1.2 parts, calcium sulphoaluminate expansive agent 1.5 parts, polyether modified organosilicon defoaming agent 0.25 parts, hydroxypropyl methylcellulose ether stabilizer 0.05 parts.

[0057] Among them, CaO+MgO+BaO in zeolite powder=18.3wt%, Na2O+K2O=2.9wt%, SiO2 is 50.6wt%, Al2O3 is 9wt%. The rest is Fe2O3 1.3wt%, LOI is 17.9%(1000 ℃ after ignition).

[0058] Among them, CaO+MgO in microbead=27.5wt%, SiO2+Al2O3=58.4wt%, the rest is Fe2O3 1.7wt%, TiO2 0.9wt%, Na2O 1.1wt%, K2O 1.2wt%, LOI 9.2%(1000 ℃). The loss on ignition of microbead at 250 ℃ is 0.3wt%. The average particle size of microbead is 5.3 μm.

[0059] Among them, the particle size of quartz powder is 800-1000 mesh.

[0060] The preparation method is: weighing each raw material according to the formula, and fully mixing each raw material uniformly.

[0061] Example 3

[0062] The present embodiment provides a kind of super high performance prestressed hole pressure slurry, and its formula is:

[0063] P·Ⅱ52.5R cement 65 parts, S95 grade slag powder 6 parts, zeolite powder 11 parts, quartz powder 8 parts, microbead 7 parts, polycarboxylic acid type water reducing agent 1.2 parts, calcium sulphoaluminate expansive agent 1.5 parts, polyether modified organosilicon defoaming agent 0.25 parts, hydroxypropyl methylcellulose ether stabilizer 0.05 parts.

[0064] Among them, CaO+MgO+BaO in zeolite powder=14.6wt%, Na2O+K2O=4.7wt%, SiO2 is 52.4wt%, Al2O3 is 9.3wt%. The rest is Fe2O3 1.5wt%, LOI is 17.5%(1000 ℃ after ignition).

[0065] Wherein, CaO+MgO in the microbead = 27.5wt%, SiO2+Al2O3 = 58.4wt%, the rest is Fe2O3 1.7wt%, TiO2 0.9wt%, Na2O 1.1wt%, K2O 1.2wt%, LOI 9.2%(1000℃). The loss on ignition of the microbead at 250℃ is 0.3wt%. The average particle size of the microbead is 5.3μm.

[0066] Wherein, the particle size of the quartz powder is 800-1000 mesh.

[0067] The preparation method is: weighing each raw material according to the formula, and fully mixing each raw material uniformly.

[0068] Example 4

[0069] The present embodiment provides a kind of super high performance prestressed hole pressure slurry, and its formula is:

[0070] P·Ⅱ52.5R cement 65 parts, S95 grade slag powder 6 parts, zeolite powder 11 parts, quartz powder 8 parts, microbead 7 parts, polycarboxylic acid type water reducing agent 1.2 parts, calcium sulphoaluminate expansive agent 1.5 parts, polyether modified organosilicon defoaming agent 0.25 parts, hydroxypropyl methylcellulose ether stabilizer 0.05 parts.

[0071] Wherein, CaO+MgO+BaO in the zeolite powder = 18.3wt%, Na2O+K2O = 2.9wt%, SiO2 is 50.6wt%, Al2O3 is 9wt%. The rest is Fe2O3 1.3wt%, LOI is 17.9%(after 1000℃ calcination).

[0072] Wherein, CaO+MgO in the microbead = 12.8wt%, SiO2+Al2O3 = 74.5wt%, the rest is Fe2O3 0.8wt%, TiO2 0.9wt%, Na2O 1.5wt%, K2O 0.7wt%, LOI 8.8%(1000℃). The loss on ignition of the microbead at 250℃ is 1.8wt%. The average particle size of the microbead is 8.5μm.

[0073] Wherein, the particle size of the quartz powder is 800-1000 mesh.

[0074] The preparation method is: weighing each raw material according to the formula, and fully mixing each raw material uniformly.

[0075] Example 5

[0076] The present embodiment provides a kind of super high performance prestressed hole pressure slurry, and its formula is:

[0077] P·Ⅱ52.5R cement 65 parts, S95 grade slag powder 6 parts, zeolite powder 11 parts, quartz powder 8 parts, microbead 7 parts, polycarboxylic acid type water reducing agent 1.2 parts, calcium sulphoaluminate expansive agent 1.5 parts, polyether modified silicone defoaming agent 0.25 parts, hydroxypropyl methylcellulose ether stabilizer 0.05 parts.

[0078] In the zeolite powder, CaO+MgO+BaO=14.6wt%, Na2O+K2O=4.7wt%, SiO2 is 52.4wt%, Al2O3 is 9.3wt%. The rest is Fe2O3 1.5wt%, LOI is 17.5% (after burning at 1000℃).

[0079] In the microbead, CaO+MgO=12.8wt%, SiO2+Al2O3=74.5wt%, the rest is Fe2O3 0.8wt%, TiO2 0.9wt%, Na2O 1.5wt%, K2O 0.7wt%, LOI 8.8% (1000℃). The loss on ignition of the microbead at 250℃ is 1.8wt%. The average particle size of the microbead is 8.5μm.

[0080] The particle size of the quartz powder is 800-1000 mesh.

[0081] The preparation method is: weighing each raw material according to the formula, and fully mixing each raw material uniformly.

[0082] Comparative Example 1

[0083] This comparative example provides a prestressed duct grouting material, which is different from Example 1 in that no mineral powder, zeolite powder, and quartz powder are mixed in the formula, 20 parts of fly ash are mixed as an admixture, the polycarboxylic acid type water reducing agent is 0.5 parts, and the water-binder ratio of the grouting material slurry is 0.28.

[0084] Comparative Example 2

[0085] This comparative example provides a prestressed duct grouting material, which is different from Example 1 in that no mineral admixture is mixed in the formula, only microbead is mixed to adjust the workability, the polycarboxylic acid type water reducing agent is 1.0 parts, and the water-binder ratio of the grouting material slurry is 0.28.

[0086] The prestressed duct grouting materials in Examples 1-8 are detected according to the methods of JTG / T F50 and GB / T 17671. Among them, the 30min fluidity and compressive strength are detected at-5℃ and 25℃ respectively. The rest are detected at 25℃. The specific results are shown in the following table:

[0087]

[0088]

[0089] As can be seen from the table, the performance parameters of the super high performance prestressed duct grouting material of the embodiment meet the performance index requirements of the Technical Specification for Highway Bridge and Culvert Construction (JTG / T 3650-2020) on the grouting material, and the 30 min fluidity and compressive strength at low temperature (-5℃) can still meet the specification requirements.

[0090] The above is the preferred embodiment of the application. It should be noted that those skilled in the art can make several improvements and refinements without departing from the principles of the application, and these improvements and refinements are also considered within the scope of protection of the application.

Claims

1. A high-performance prestressed duct grouting material, characterized in that, It includes the following components by weight: 60-80 parts cement, 1-8 parts slag powder, 2-12 parts zeolite powder, 2-15 parts quartz powder, 5-15 parts microspheres, 0.2-4 parts water-reducing agent, 1.5-4 parts expanding agent, 0.05-0.5 parts defoamer, and 0.05-0.1 parts stabilizer; The sum of the weight parts of the above components is 100 parts; The zeolite powder contains CaO+MgO+BaO=10~20wt%, Na2O+K2O=0.5~5wt%, SiO2≤55wt%, and Al2O3≥8wt%; the weight ratio of alkaline earth metal oxide RO to alkali metal oxide R2O is (5~10):

1. In the microspheres, CaO + MgO = 15~30wt%, SiO2 + Al2O3 = 40~60wt%.

2. The ultra-high performance prestressed duct grouting material as described in claim 1, characterized in that, The weight ratio of alkaline earth metal oxide RO to alkali metal oxide R2O in the zeolite powder is 16.8:2.

3.

3. The ultra-high performance prestressed duct grouting material as described in claim 2, characterized in that, In the zeolite powder, CaO+MgO+BaO=16.8wt%, Na2O+K2O=2.3wt%, SiO2=48.3wt%, and Al2O3=10.7wt%.

4. The ultra-high performance prestressed duct grouting material as described in claim 3, characterized in that, In the microspheres, CaO + MgO = 27.5 wt%, SiO2 + Al2O3 = 58.4 wt%.

5. The ultra-high performance prestressed duct grouting material as described in claim 4, characterized in that, The loss on ignition of the microspheres at 250°C is ≤1.2wt%.

6. The ultra-high performance prestressed duct grouting material as described in claim 1, characterized in that, The average particle size of the microbeads is 5~10μm.

7. The ultra-high performance prestressed duct grouting material as described in claim 1, characterized in that, The cement is silicate cement with a strength grade of 42.5 or 52.

5.

8. The ultra-high performance prestressed duct grouting material as described in claim 1, characterized in that, The slag powder is selected from S95 grade slag powder and / or S105 grade slag powder. The quartz powder has a fineness of 120 mesh to 1000 mesh.

9. The ultra-high performance prestressed duct grouting material as described in claim 1, characterized in that, The water-reducing agent is selected from one or more of aliphatic water-reducing agents, polycarboxylic acid water-reducing agents, and sulfonate water-reducing agents; The expanding agent is selected from sulfoaluminate expanding agents and / or magnesium oxide expanding agents; The defoamer is selected from polysiloxane defoamer and / or polyether defoamer; The stabilizer is a cellulose ether stabilizer.

10. The method for preparing ultra-high performance prestressed duct grouting material according to any one of claims 1 to 9, characterized in that, include: Cement, slag powder, zeolite powder, quartz powder, microspheres, water-reducing agent, expanding agent, defoamer and stabilizer are mixed evenly according to the formula to obtain ultra-high performance prestressed duct grouting material.

Images