Hydropower station dam foundation grouting consolidation anti-seepage agent

Abstract

The invention discloses a hydropower station dam foundation grouting consolidation seepage-proofing agent, and belongs to the technical field of crack repairing agents. The high-strength cement mortar is prepared from the following components in parts by weight: 40 to 60 parts of superfine sulphoaluminate cement, 15 to 25 parts of superfine ardealite, 10 to 20 parts of fly ash sinking beads, 5 to 20 parts of a macromolecular emulsion, 0.1 to 0.5 part of a nano ettringite early strength agent and 0.05 to 0.2 part of a viscosity reducer. According to the invention, the superfine powder can be filled into the deep crack, so that the water seepage resistance of the dam foundation of the hydropower station is improved; the sulphoaluminate cement with the volume micro-expansion characteristic is suitable for crack repair; in addition, the low alkalinity has better fresh water erosion resistance; gypsum as industrial solid waste is one of raw materials, so that the cost of the raw materials is reduced, and the setting time is prolonged by matching with cement; fly ash sinking beads which are also used as industrial solid wastes are subjected to chemical reaction under excitation of the sulfate cement and the ardealite, so that the crack repairing and anti-seepage performance is improved; and a ball effect can be exerted to increase the flowability, so that the penetrability in the crack is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of crack repairing agents, in particular to a grouting consolidation anti-seepage agent for a dam foundation of a hydropower station. Background Art

[0002] As an important part of water conservancy and hydropower projects, the stability and safety of the dam foundation of a hydropower station are directly related to the operating efficiency and safety of the entire project. However, due to the special location and complex geological conditions of the dam foundation, the dam foundation often has problems such as leakage and instability. These problems not only affect the normal operation of the hydropower station, but may also pose a serious threat to the surrounding environment and the safety of people's lives and property.

[0003] At present, grouting technology is a widely used method for the treatment of hydropower station dam foundations. Grouting technology injects specific consolidation materials into the dam foundation, which forms a consolidation body with a certain strength and stability after solidification, thereby strengthening and improving the bearing capacity and stability of the dam foundation. This technology can effectively solve problems such as cracks and pores in the dam foundation and improve the overall bearing capacity and anti-seepage performance of the dam foundation.

[0004] In practical applications, the selection of grouting materials is an important factor affecting the grouting effect and engineering quality. Among them, cement slurry is widely used due to its good impermeability and water resistance. However, the grouting effect of traditional cement grouting materials may not be ideal under certain special geological conditions, such as fault fracture zones and joint-intensive zones, and it is difficult to meet the high requirements of the project for dam foundation stability and anti-seepage performance.

[0005] Therefore, developing a new type of hydropower station dam foundation grouting consolidation anti-seepage agent to solve the shortcomings of traditional grouting materials under certain special geological conditions and improve the grouting effect and engineering quality has important practical significance and engineering value. This new anti-seepage agent should have excellent fluidity, water resistance, adhesion and hardening speed, be able to adapt to various complex geological conditions, ensure that the grouting fully penetrates into the dam foundation, and form a stable and dense consolidation body, thereby improving the bearing capacity and anti-seepage performance of the dam foundation. Summary of the invention

[0006] The purpose of the present invention is to propose a grouting consolidation anti-seepage agent for the dam foundation of a hydropower station, so as to solve the problems that the traditional grouting consolidation anti-seepage agent has insufficient performance such as fluidity, anti-seepage and environmental adaptability, is difficult to achieve efficient repair and long-term durability of cracks, and cannot meet the requirements of long-term safe and stable operation of hydropower stations.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: A hydropower station dam foundation grouting consolidation anti-seepage agent is prepared by weight from: 40-60 parts of ultrafine sulphoaluminate cement, 15-25 parts of ultrafine phosphogypsum, 10-20 parts of fly ash beads, 5-20 parts of polymer emulsion, 0.1-0.5 parts of nano-ettringite early strength agent and 0.05-0.2 parts of viscosity reducer.

[0008] In some embodiments, the composition is prepared from, by weight: 50 parts of ultrafine sulphoaluminate cement, 20 parts of ultrafine phosphogypsum, 15 parts of fly ash beads, 10 parts of polymer emulsion, 0.3 parts of nano-calcium sulfoxide early strength agent and 0.1 parts of viscosity reducer.

[0009] In some embodiments, the ultrafine sulphoaluminate cement has a 45 µm square hole sieve residue of less than 5%.

[0010] In some embodiments, the ultrafine phosphogypsum has a 45 µm square hole sieve residue of less than 5%.

[0011] In some embodiments, the fly ash beads have a 10 μm square hole sieve residue of less than 5%.

[0012] In some embodiments, the polymer emulsion is any one of an acetic acid propylene emulsion or a styrene butadiene emulsion, or a mixture of the two.

[0013] In some embodiments, the polymer emulsion is a mixture of an acetic acid propylene emulsion and a styrene butadiene emulsion; The mixing ratio of the acetic acid propylene emulsion and the styrene butadiene emulsion is 1:2~3 by weight.

[0014] In some embodiments, the particle size of the nano-ettringite early strength agent is less than 200 nanometers.

[0015] In some embodiments, the viscosity reducing agent is any one of sodium xylene sulfonate or sulfonated styrene-maleic anhydride copolymer, or a mixture of the two.

[0016] In some embodiments, the viscosity reducing agent is: a mixture of sodium xylene sulfonate and sulfonated styrene-maleic anhydride copolymer; The mixing ratio of sodium xylene sulfonate and sulfonated styrene-maleic anhydride copolymer is 1-2:3 by weight.

[0017] In some embodiments, when used, the mixing ratio of the hydropower station dam foundation grouting consolidation anti-seepage agent to deionized water is: 100:30~50.

[0018] Compared with the prior art, the present invention provides a hydropower station dam foundation grouting consolidation anti-seepage agent, which has the following beneficial effects.

[0019] 1. The present invention controls the fineness of ultrafine sulphoaluminate cement, ultrafine phosphogypsum and fly ash beads, so that the ultrafine powder can be filled into the deep cracks, thereby improving the water seepage resistance of the dam foundation of a hydropower station; the sulphoaluminate cement with a volume micro-expansion characteristic is suitable for crack repair; and its low alkalinity has better freshwater erosion resistance; gypsum, which is an industrial solid waste, is used as one of the raw materials, thereby reducing the cost of raw materials and extending the setting time when combined with cement; the fly ash beads, which are also industrial solid waste, react chemically under the stimulation of sulfate cement and phosphogypsum, thereby improving crack repair and water seepage resistance; and can exert a "ball effect" to increase fluidity and further improve the penetration in the cracks; the viscosity reducer increases fluidity and further improves the penetration in the cracks; through the composite effect of organic-inorganic materials, the interface bonding ability is improved, the anti-segregation ability is improved, and the homogeneity of the slurry material is improved; the nano-calcium sulfoxide early strength agent provides crystal nucleation growth sites, accelerates the hydration rate, and shortens the construction period.

[0020] Other advantages, objectives and features of the present invention will be described in part in the following description; and in part, will be apparent to those skilled in the art based on an examination of the following; or, may be taught from the practice of the present invention. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] A hydropower station dam foundation grouting consolidation anti-seepage agent, measured by weight: The invention discloses a composite material comprising 40-60 parts of ultrafine sulphoaluminate cement, 15-25 parts of ultrafine phosphogypsum, 10-20 parts of fly ash beads, 5-20 parts of polymer emulsion, 0.1-0.5 parts of nano-calcium sulfoxide early strength agent and 0.05-0.2 parts of viscosity reducer.

[0023] In the grouting consolidation anti-seepage agent provided by the present invention: The main raw materials are sulphoaluminate cement and phosphogypsum with micro-expansion characteristics, and have strong crack repairing ability. The grouting material's deep crack penetration ability and micro-crack repair effect are improved through technologies such as ultra-fine raw materials, nano-micron spherical fly ash beads to exert a rolling effect, and the addition of viscosity reducers to improve slurry fluidity. Polymer emulsion is used to improve the crack repair weather resistance of the grouting material. Nano-crystalline core early strength agent is introduced to accelerate the cement hydration reaction rate and shorten the construction period.

[0024] The present invention fully meets the requirements of crack repair, impermeability and durability caused by long-term freshwater erosion and environmental temperature changes, and can improve the safety of the dam foundation structure of the hydropower station.

[0025] Furthermore, the fineness of some components is limited.

[0026] The residue on the 45µm square mesh sieve of ultrafine sulphoaluminate cement is less than 5%; The residue on the 45µm square mesh sieve of ultrafine phosphogypsum is less than 5%. ; The 10µm square hole sieve residue of fly ash beads is less than 5%.

[0027] It should be noted that traditional grouting consolidation anti-seepage agents are difficult to repair micro cracks and deep cracks due to their large particle size (for example, the common commercially available sulphoaluminate cement has a 45-micron sieve residue standard of no more than 35%), resulting in poor crack repair ability.

[0028] The grouting consolidation anti-seepage agent provided by the present invention aims to solve the problems of deep cracks and difficult filling of micro-cracks in the dam foundation of a hydropower station. Ultrafine powders such as ultrafine sulphoaluminate cement (the sieve residue of a 45µm square hole sieve is less than 5%), ultrafine phosphogypsum (the sieve residue of a 45µm square hole sieve is less than 5%), and fly ash beads (the sieve residue of a 10µm square hole sieve is less than 5%) are used as main raw materials of the grouting consolidation anti-seepage agent. The agent can effectively penetrate micro-cracks and fill them to deeper cracks at a greater distance, thereby achieving deep-level repair of cracks and improving the anti-water seepage performance of the dam foundation of a hydropower station.

[0029] In the present invention, sulphoaluminate cement is one of the main cementitious materials, and its main functions include the following aspects: 1) The hydration products of sulphoaluminate cement are mainly minerals such as ettringite (hydrated calcium sulphoaluminate). Because its hydration reaction process has the characteristic of micro-volume expansion, it is suitable for the field of crack repair and anti-seepage agent; 2) Compared with the common silicate cement system, the pH inside the hardened slurry of sulphoaluminate cement is about 10.0, which has the advantage of low alkali. Therefore, on the one hand, sulphoaluminate cement can have better freshwater erosion resistance in the freshwater environment of the hydropower station dam foundation, and on the other hand, it can release less harmful alkaline ions into the external environment to avoid damaging the ecological environment.

[0030] In the present invention, ultrafine phosphogypsum is used as one of the main cementitious materials, and its main functions include the following aspects: 1) During the hydration reaction of gypsum, a small amount of volume expansion will occur, which can effectively seal cracks, so it is suitable for the field of crack repair and anti-seepage agents; 2) The addition of gypsum can reduce the amount of expensive sulphoaluminate cement used and reduce the cost of raw materials; further, the phosphogypsum used in the present invention is industrial solid waste, which can realize the resource utilization of solid waste and has good economic and environmental benefits; 3) Sulphoaluminate cement itself has the characteristics of fast setting and early strength. After ultra-fine treatment, the setting and hardening speed of cement paste is greatly accelerated, which is not conducive to construction and penetration of grouting materials into deep cracks. The sulfate ions and phosphate ions in phosphogypsum have good retarding effect. When used in combination with cement, the setting time of ultra-fine sulphoaluminate cement can be extended, and the construction performance and grouting penetration depth of the grouting consolidation anti-seepage agent of the present invention can be improved.

[0031] In the present invention, fly ash sinking beads are one of the main raw materials. Fly ash sinking beads are also a kind of industrial waste, which are hollow microspheres separated from fly ash. According to density, they can be divided into sinking beads and floating beads; the density is greater than 1g / cm 3 The main functions of fly ash sinking beads include the following aspects: 1) In terms of chemistry, fly ash beads are mainly micro-nano silicon-alumina materials with a particle size of less than 10µm, so they have high chemical reactivity. Under the stimulation of sulfate cement and phosphogypsum, chemical reactions can occur to improve the crack repair and anti-seepage performance of the grouting consolidation anti-seepage agent; 2) In terms of physics, fly ash beads are round beads with excellent morphology. When added to grouting materials, they can exert a "ball effect", increase the fluidity of the grouting slurry, and enhance the penetration and sealing effect of the grouting material in fine cracks and deep cracks, thereby improving crack repair and water permeability resistance.

[0032] The polymer emulsion is any one of acetic acid propylene emulsion or styrene butadiene emulsion, or a mixture of the two.

[0033] Preferably, the polymer emulsion is a mixture of an acetic acid propylene emulsion and a styrene butadiene emulsion; the mixing ratio of the acetic acid propylene emulsion and the styrene butadiene emulsion is 1:2-3 by weight.

[0034] Further preferably, the polymer emulsion is a mixture of a vinyl acetate emulsion and a styrene butadiene emulsion; in parts by weight, the mixing ratio of the vinyl acetate emulsion and the styrene butadiene emulsion is 1:2.

[0035] More preferably, the polymer emulsion is an acetic acid propylene emulsion, which has better performance at the same dosage.

[0036] In the present invention, a polymer emulsion such as acetic acid propylene emulsion and styrene butadiene emulsion is used as one of the main raw materials, and its main functions include the following aspects: 1) Organic polymer emulsion is added to the inorganic cement matrix. Through the composite effect of organic-inorganic materials, the bonding ability of the grouting consolidation anti-seepage agent and the new-old interface of the hydropower station dam foundation can be improved, and the environmental temperature adaptability of the grouting consolidation anti-seepage agent can be improved to meet the long-term anti-seepage requirements of the hydropower station dam foundation crack expansion and contraction changes caused by the environmental temperature changes of low temperature in winter and high temperature in summer; 2) The grouting consolidation anti-seepage agent of the present invention has complex components, many types of particles, and a wide range of particle size distribution; the addition of polymer emulsion can enhance the anti-segregation ability of the grouting consolidation anti-seepage agent and improve the homogeneity of the slurry material.

[0037] Preferably, the particle size of the nano-ettringite early strength agent is less than 200 nanometers.

[0038] In the present invention, nano-ettringite early strength agent is used as one of the main raw materials, and its main functions are: providing crystal nucleation growth sites for the hydration reaction of calcium sulfoaluminate cement and phosphogypsum, accelerating the hydration rate of the cementitious material; moreover, the addition of the early strength agent has little effect on the setting time of the cement, which helps to shorten the construction period of the dam foundation crack repair of the hydropower station; in addition, it is combined with other materials to control the particle size.

[0039] The viscosity reducing agent is: any one of sodium xylene sulfonate or sulfonated styrene-maleic anhydride copolymer, or a mixture of the two.

[0040] Preferably, the viscosity reducing agent is a mixture of sodium xylene sulfonate and sulfonated styrene-maleic anhydride copolymer; the mixing ratio of sodium xylene sulfonate and sulfonated styrene-maleic anhydride copolymer is 1-2:3 by weight.

[0041] More preferably, the viscosity reducer is a mixture of sodium xylene sulfonate and sulfonated styrene-maleic anhydride copolymer; the mixing ratio of sodium xylene sulfonate and sulfonated styrene-maleic anhydride copolymer is 2:3 by weight.

[0042] More preferably, the viscosity reducer is a sulfonated styrene-maleic anhydride copolymer; it has better performance at the same dosage.

[0043] In the present invention, viscosity reducers such as sodium xylene sulfonate and sulfonated styrene-maleic anhydride copolymer are used as one of the main raw materials. Their main functions are: reducing the viscosity of the grouting consolidation anti-seepage agent of the present invention, increasing the fluidity of the slurry, and improving the penetration and sealing effect of the grouting material in fine cracks and deep cracks, thereby improving crack repair and water permeability resistance.

[0044] In the present invention, the fineness of ultrafine sulphoaluminate cement, ultrafine phosphogypsum and fly ash beads is controlled, and the ultrafine powder can be filled into the deep cracks to improve the water seepage resistance of the dam foundation of the hydropower station; the sulphoaluminate cement with volume micro-expansion characteristics is suitable for crack repair; and its low alkalinity has better freshwater erosion resistance; gypsum, which is an industrial solid waste, is used as one of the raw materials, which reduces the cost of raw materials and is combined with cement to extend the setting time; the fly ash beads, which are also industrial solid waste, react chemically under the stimulation of sulfate cement and phosphogypsum to improve crack repair and water seepage resistance; and can exert a "ball effect" to increase fluidity and further improve the penetration in the cracks; the viscosity reducer increases fluidity and further improves the penetration in the cracks; through the composite effect of organic-inorganic materials, the interface bonding ability is improved, the anti-segregation ability is improved, and the homogeneity of the slurry material is improved; the nano calcium sulfaluminite early strength agent provides crystal nucleation growth sites, accelerates the hydration rate, and shortens the construction period.

[0045] Furthermore, when used: the mixing ratio (by weight) of the hydropower station dam foundation grouting consolidation anti-seepage agent and deionized water is: 100:30~50.

[0046] Preferably, when used, the mixing ratio (by weight) of the hydropower station dam foundation grouting consolidation anti-seepage agent and deionized water is: 100:38.

[0047] Therefore, by controlling the amount of deionized water used, the grouting consolidation anti-seepage agent can react with each component under suitable water addition conditions, flow to the deep cracks to fill them, and has excellent performance.

[0048] Example 1 A hydropower station dam foundation grouting consolidation anti-seepage agent, measured by weight: It is prepared by 40 parts of ultrafine sulphoaluminate cement, 25 parts of ultrafine phosphogypsum, 20 parts of fly ash beads, 5 parts of polymer emulsion, 0.5 parts of nano-calcium sulfoxide early strength agent and 0.05 parts of viscosity reducer.

[0049] The residue on the 45µm square hole sieve of ultrafine sulphoaluminate cement is less than 5%.

[0050] The residue on the 45µm square hole sieve of ultrafine phosphogypsum is less than 5%.

[0051] The 10µm square hole sieve residue of fly ash beads is less than 5%.

[0052] The polymer emulsion is an acetic acid propylene emulsion.

[0053] The particle size of nano calcium sulfide early strength agent is less than 200 nanometers.

[0054] The viscosity reducing agent is sodium xylene sulfonate.

[0055] Example 2 A hydropower station dam foundation grouting consolidation anti-seepage agent, measured by weight: It is prepared by 60 parts of ultrafine sulphoaluminate cement, 15 parts of ultrafine phosphogypsum, 10 parts of fly ash beads, 20 parts of polymer emulsion, 0.1 parts of nano-calcium sulfoxide early strength agent and 0.2 parts of viscosity reducer.

[0056] The residue on the 45µm square hole sieve of ultrafine sulphoaluminate cement is less than 5%.

[0057] The residue on the 45µm square hole sieve of ultrafine phosphogypsum is less than 5%.

[0058] The 10µm square hole sieve residue of fly ash beads is less than 5%.

[0059] The polymer emulsion is styrene-butadiene emulsion.

[0060] The particle size of nano calcium sulfide early strength agent is less than 200 nanometers.

[0061] The viscosity reducer is sulfonated styrene-maleic anhydride copolymer.

[0062] Example 3 A hydropower station dam foundation grouting consolidation anti-seepage agent, measured by weight: It is prepared by 50 parts of ultrafine sulphoaluminate cement, 20 parts of ultrafine phosphogypsum, 15 parts of fly ash beads, 10 parts of polymer emulsion, 0.3 parts of nano-calcium sulfoxide early strength agent and 0.1 parts of viscosity reducer.

[0063] The residue on the 45µm square hole sieve of ultrafine sulphoaluminate cement is less than 5%.

[0064] The residue on the 45µm square hole sieve of ultrafine phosphogypsum is less than 5%.

[0065] The 10µm square hole sieve residue of fly ash beads is less than 5%.

[0066] The polymer emulsion is a mixture of acetic acid propylene emulsion and styrene butadiene emulsion; the mixing ratio is 1:2 by weight.

[0067] The particle size of nano calcium sulfide early strength agent is less than 200 nanometers.

[0068] The viscosity reducing agent is a mixture of sodium xylene sulfonate and sulfonated styrene-maleic anhydride copolymer; the mixing ratio is 2:3 by weight.

[0069] Example 4: The difference from Example 1 is that 15 parts of ultrafine phosphogypsum are used.

[0070] Example 5: The difference from Example 1 is that 10 parts of fly ash beads are used.

[0071] Example 6: The difference from Example 1 is that 20 parts of polymer emulsion are used.

[0072] Example 7: The difference from Example 1 is that the amount of nano-ettringite early strength agent used is 0.1 parts.

[0073] Example 8: The difference from Example 1 is that the viscosity reducer used is 0.2 parts.

[0074] Embodiment 9: Different from Embodiment 1, the polymer emulsion used is styrene-butadiene emulsion.

[0075] Example 10: Different from Example 1, the polymer emulsion used is a mixture of acetic acid propylene emulsion and styrene butadiene emulsion; the mixing ratio by weight is 1:3.

[0076] Example 11: Different from Example 1, the viscosity reducer used is sulfonated styrene-maleic anhydride copolymer.

[0077] Example 12: The difference from Example 1 is that the viscosity reducer used is a mixture of sodium xylene sulfonate and sulfonated styrene-maleic anhydride copolymer; the mixing ratio by weight is 1:3.

[0078] Application Examples According to the ratios described in Examples 1-12, the corresponding hydropower station dam foundation grouting consolidation anti-seepage agents were prepared; then, 100 g of the hydropower station dam foundation grouting consolidation anti-seepage agents prepared in Examples 1-12 and 38 g of deionized water were taken, stirred and mixed evenly, and the mixtures were recorded as experimental groups 1-12 respectively.

[0079] According to GB / T50448-2015 "Technical Specification for Application of Cement-based Grouting Materials", the truncated cone fluidity method is used to determine the fluidity of the grouting consolidation anti-seepage agent slurry, and the crack penetration depth of the slurry at the construction site is evaluated; the 3-hour vertical expansion rate is used to evaluate the filling effect of the slurry on the crack pores after hardening; the 1-day compressive strength is used to evaluate the mechanical properties of the grouting consolidation anti-seepage agent after hardening; the Vicat instrument is used to test the setting time, among which a longer initial setting time ensures that the slurry has good construction workability, and a shorter final setting time ensures that the slurry can be quickly repaired; according to the water seepage height method in GB / T 50082-2024 "Standard for Test Methods for Long-term Performance and Durability of Ordinary Concrete", the water penetration resistance of the grouting consolidation anti-seepage agent is characterized.

[0080] The test results of experimental groups 1-12 are shown in the following table.

[0081] From the above data analysis, we can know that: Ultrafine sulphoaluminate cement is one of the main components of the grouting consolidation anti-seepage agent for the dam foundation of a hydropower station. The hydration products such as ettringite and hydrated calcium silicate gel generated after its hydration reaction have volume expansion properties (especially the generation of ettringite, which can expand to 2.5 times in volume), and can significantly improve the vertical expansion rate of the grouting consolidation anti-seepage agent for the dam foundation of a hydropower station. However, due to the fast hydration reaction rate of the ultrafine sulphoaluminate cement, its setting speed is fast, resulting in a problem of tight construction period. Therefore, phosphogypsum is introduced in this embodiment to extend the setting time.

[0082] By comparing experimental groups 1 and 4, it can be seen that insufficient phosphogypsum content will lead to rapid coagulation of the slurry, causing problems such as tight time for actual construction and rapid deterioration of the slurry.

[0083] By comparing experimental groups 1 and 5, it can be seen that a high content of fly ash beads can improve the fluidity of the grouting consolidation anti-seepage agent, increase the penetration depth of the anti-seepage agent in the cracks of the dam foundation of the hydropower station, and achieve deep repair of the cracks.

[0084] By comparing experimental groups 1 and 6, it can be seen that a high content of polymer emulsion can significantly improve the water permeability resistance of the grouting consolidation anti-seepage agent; however, its excessive dosage will also cause problems such as reduced fluidity and decreased compressive strength; therefore, the addition of polymer emulsion needs to be within a reasonable range.

[0085] By comparing experimental groups 1 and 7, it can be seen that increasing the content of nano-ettringite early strength agent can significantly improve the one-day compressive strength of the grouting consolidation anti-seepage agent, which is mainly related to its promotion of cement hydration nucleus growth; however, the introduction of nanomaterials will also have a certain negative effect on fluidity due to their huge specific surface area.

[0086] By comparing experimental groups 1 and 8, it can be seen that a high content of viscosity reducer can significantly improve the fluidity of the grouting consolidation anti-seepage agent, which can improve the repair effect of deep cracks in actual engineering.

[0087] According to the results of experimental groups 1, 9 and 10, it can be seen that the type of polymer emulsion (acetyl acetate acrylic emulsion and styrene butadiene emulsion) will affect the various properties of grouting consolidation anti-seepage agent; among them, acetate acrylic emulsion has better performance at the same dosage because it has more functional groups such as ester and carboxyl groups.

[0088] According to the results of experimental groups 1, 11 and 12, the type of viscosity reducer (sodium xylene sulfonate and sulfonated styrene-maleic anhydride copolymer) will affect the various properties of grouting consolidation anti-seepage agent; among them, sulfonated styrene-maleic anhydride copolymer has better performance at the same dosage.

[0089] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0090] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A hydropower station dam foundation grouting consolidation anti-seepage agent, characterized in that: The invention is prepared from 40-60 parts of ultrafine sulphoaluminate cement, 15-25 parts of ultrafine phosphogypsum, 10-20 parts of fly ash beads, 5-20 parts of polymer emulsion, 0.1-0.5 parts of nano-ettringite early strength agent and 0.05-0.2 parts of viscosity reducer by weight.

2. The hydropower station dam foundation grouting consolidation anti-seepage agent according to claim 1, characterized in that: The invention is prepared from 50 parts of ultrafine sulphoaluminate cement, 20 parts of ultrafine phosphogypsum, 15 parts of fly ash beads, 10 parts of polymer emulsion, 0.3 parts of nano-calcium sulfoxide early strength agent and 0.1 parts of viscosity reducer by weight.

3. The hydropower station dam foundation grouting consolidation anti-seepage agent according to claim 1, characterized in that: The sieve residue of the ultrafine sulphoaluminate cement on a 45µm square hole sieve is less than 5%.

4. The hydropower station dam foundation grouting consolidation anti-seepage agent according to claim 1, characterized in that: The sieve residue of the ultrafine phosphogypsum on a 45µm square hole sieve is less than 5%.

5. The hydropower station dam foundation grouting consolidation anti-seepage agent according to claim 1, characterized in that: The fly ash beads have a 10µm square hole sieve residue of less than 5%.

6. The hydropower station dam foundation grouting consolidation anti-seepage agent according to claim 1, characterized in that: The polymer emulsion is any one of acetic acid propylene emulsion and styrene butadiene emulsion, or a mixture of the two.

7. The hydropower station dam foundation grouting consolidation anti-seepage agent according to claim 6, characterized in that: The polymer emulsion is a mixture of acetic acid propylene emulsion and styrene butadiene emulsion; The mixing ratio of the acetic acid propylene emulsion and the styrene butadiene emulsion is 1:2~3 by weight.

8. The hydropower station dam foundation grouting consolidation anti-seepage agent according to claim 1, characterized in that: The viscosity reducing agent is any one of sodium xylene sulfonate or sulfonated styrene-maleic anhydride copolymer, or a mixture of the two.

9. The hydropower station dam foundation grouting consolidation anti-seepage agent according to claim 8, characterized in that: The viscosity reducer is a mixture of sodium xylene sulfonate and sulfonated styrene-maleic anhydride copolymer; the mixing ratio of sodium xylene sulfonate and sulfonated styrene-maleic anhydride copolymer is 1-2:3 by weight.

10. The hydropower station dam foundation grouting consolidation anti-seepage agent according to claim 1, characterized in that: When in use, the mix ratio of the hydropower station dam foundation grouting consolidation anti-seepage agent and deionized water is: 100:30~50.

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