An asphalt concrete core wall leakage treatment grouting material and a preparation method thereof

Abstract

The application discloses a kind of asphalt concrete core wall leakage treatment grouting material and preparation method thereof, belong to hydraulic material technical field.The grouting material includes the following component by mass fraction: emulsified asphalt 5~30 parts, slag 70~90 parts, gypsum 1~5 parts, quicklime powder 1~5 parts, stabilizer 1~3 parts, water reducing agent 0.5~2 parts, water 50~100 parts.The application is mixed with emulsified asphalt and stabilizer, which greatly improves the ductility of grouting material, the adhesion and deformation compatibility with asphalt concrete core wall.On the other hand, using slag, gypsum, quicklime stone powder, etc., improves the diffusion and filling density of grouting material in micro crack, improves the overall impermeability of asphalt concrete core wall, solves the leakage treatment failure problem caused by the large difference in mechanical properties and deformation performance between conventional core wall leakage treatment grouting material and core wall asphalt concrete.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of hydraulic materials, and particularly relates to a low-elasticity large-deformation high-impervious asphalt concrete core wall leakage treatment grouting material and a preparation method thereof. BACKGROUND

[0002] The asphalt concrete core wall dam is a type of earth-rock dam widely used in water conservancy projects, and the core impervious body thereof is constructed by using asphalt concrete material. This dam type combines the economy of earth-rock dams and the excellent performance of asphalt concrete. The asphalt concrete core wall dam has significant advantages in water conservancy construction due to its excellent anti-seepage performance, deformation adaptability and construction convenience, and is particularly suitable for areas with complex geological conditions, large temperature differences or high seismic requirements. More than 120 asphalt concrete core wall dams have been built globally, and there are 31 asphalt concrete impervious dams with a height of 30 m or more that have been built or are under construction in China. Although the asphalt concrete core wall dam has excellent anti-seepage performance, it may still have leakage problems in actual projects due to factors such as material, design, construction, and environment.

[0003] If the core wall leakage problem is not timely addressed, it will cause a series of engineering safety risks, such as: the seepage of reservoir water through the dam body defect channel will form internal water pressure, weaken the effective stress of the dam body, and increase the seepage pressure; long-term seepage of asphalt concrete will cause material aging and reduce the anti-seepage capacity; the bearing capacity of the foundation will decrease; the deformation of the dam body will increase; long-term leakage will cause the rise of the saturation line, which may cause uneven settlement, etc.

[0004] Common leakage treatment methods include: 1) dam grouting repair, injecting mixed slurry between the upstream transition material and the core wall of the asphalt concrete core wall, and the slurry stone and the original asphalt concrete core wall together form an impervious curtain; 2) concrete cutoff wall repair, using drilling, grab bucket and other pore-forming mechanical equipment to build slots in the dam body or foundation, using mud to solidify the wall, and pouring concrete in the slotted hole filled with mud to form a continuous concrete wall to achieve the purpose of imperviousness; 3) upstream vertical impervious + dam surface impervious repair, i.e. building a new concrete cutoff wall in the dam body below the controllable water level of the upstream dam slope, and the concrete cutoff wall penetrates into the relatively impermeable strong weathered layer, and the upstream dam slope above this elevation is provided with reinforced concrete face slab or composite geomembrane dam surface imperviousness. The key point of the leakage treatment of 2) and 3) is to rebuild the impervious system, and such schemes have high engineering cost and still have the risk of recurrence of old diseases.

[0005] Grouting treatment at the leakage site is the most effective and economic treatment means. The core wall is an ultra-thin wall structure located inside the dam body, and the leakage path is hidden, so it is difficult to accurately locate the defect position by traditional detection methods (such as drilling). The method of grouting hot pitch can be implemented in a certain depth range at the top of the core wall, but it cannot be implemented in the deep part of the core wall. The existing grouting materials mostly use cement-based grouting materials, epoxy or polyurethane grouting materials, and the liquid permeability coefficient (10⁻ 5 ~10⁻ 6 cm / s) is higher than that of the asphalt concrete (10⁻¹ 0 cm / s) of the core wall, so it is difficult to form an effective anti-seepage curtain; the interface between the solidified slurry and the asphalt concrete is weakly bonded, and a secondary seepage channel is easily formed; the elastic modulus of the solidified slurry is large, and the deformation capacity is weak, so under the action of load and temperature, the deformation of the solidified slurry is not coordinated with that of the low-elasticity modulus asphalt concrete of the core wall, resulting in interface debonding and plugging failure.

[0006] In summary, how to prepare a low-elasticity modulus, large-deformation and high-anti-seepage grouting material is particularly important for the treatment of asphalt concrete core wall leakage. SUMMARY

[0007] Based on the many problems in the prior art, in the long-term research on the treatment of asphalt concrete core wall leakage, a low-elasticity modulus, large-deformation and high-anti-seepage grouting material is proposed. On the one hand, by adding emulsified asphalt and stabilizer, the ductility, bonding performance with the asphalt concrete core wall, deformation coordination and underwater dispersion resistance of the grouting material are greatly improved. On the other hand, by using ultra-fine powders such as slag, gypsum, quicklime stone powder, the diffusion and filling density of the grouting material in the micro-fine cracks are improved, the overall anti-seepage performance of the asphalt concrete core wall is improved, and the debonding and non-dense grouting caused by the large difference in mechanical properties and deformation performance between the conventional core wall leakage treatment grouting material and the asphalt concrete of the core wall are solved.

[0008] In order to achieve the above-mentioned purpose of the application, the following technical solutions are adopted in the present application:

[0009] A grouting material for treating asphalt concrete core wall leakage, comprising the following components mixed by mass fraction:

[0010] Emulsified asphalt 5~30 parts,

[0011] Slag 70~90 parts,

[0012] Gypsum 1~5 parts,

[0013] Quicklime powder 1~5 parts,

[0014] Stabilizer 1~3 parts,

[0015] Water reducing agent 0.5~2 parts,

[0016] Water 50-100 parts.

[0017] Further, the emulsified asphalt demulsification time is ≥60 min, Dmax≤5 μm, solid content ≥60%, Engler viscosity 1-20 s. When the emulsified asphalt is used as the main component of the grouting material, considering the time requirement of the preparation and transportation of the slurry, the emulsified asphalt is controlled to not demulsify before reaching the crack site of the grouting; the particle size of the emulsified asphalt is controlled to ensure the diffusion and penetration of the grouting material in the micro-fine cracks, and to ensure the filling of the micro-fine cracks by the grouting material; the solid content and viscosity of the emulsified asphalt are controlled to ensure the bonding shear performance, stability and rheological performance of the grouting material and the core wall asphalt.

[0018] Further, the slag is S125 grade superfine slag, and the specific surface area is ≥700 m 2 / kg. The superfine slag powder with high activity is selected to improve the alkali activation effect.

[0019] Further, the gypsum is β-type hemihydrate gypsum, and Dmax≤10 μm. The natural gypsum, desulfurization gypsum, phosphogypsum and other gypsums need to be calcined into hemihydrate gypsum and treated for harmful impurities; the α-type hemihydrate gypsum and anhydrite have high strength, and are not suitable for preparing the grouting material with low elastic modulus. The β-type hemihydrate gypsum does not need to be calcined and treated, and can be directly used as the activator of the superfine slag in the grouting material and for adjusting the setting time of the slurry.

[0020] Further, the quicklime powder has Dmax≤10 μm. The quicklime can be used for activating the slag and adjusting the temperature of the slurry, and can improve the rheological performance of the slurry. Especially in high-altitude areas and cold areas, the viscosity of the emulsified asphalt will increase under the condition of low temperature, which is not conducive to the preparation, transportation and construction of the grouting material. The addition of the quicklime powder can provide the alkaline environment required for the activity activation of the superfine slag powder, and can also improve the temperature of the slurry, reduce the viscosity and yield shear stress of the slurry, and is conducive to the diffusion and filling of the slurry in the micro-fine cracks. At the same time, the addition of the quicklime powder can avoid the risk of premature demulsification of the emulsified asphalt caused by hot water stirring, and can also avoid the complication of the construction process caused by the wrapping of the insulation layer of the slurry conveying pipe.

[0021] Further, the stabilizer is colloidal attapulgite, and the dynamic viscosity is ≤500 mPa·s and Dmax≤5 μm. The colloidal attapulgite has the functions of thickening and homogenizing in the solid-liquid multiphase body, prevents the separation of the materials by sedimentation, and keeps the rheological properties of the slurry stable. The shear thinning characteristics of the colloidal attapulgite can reduce the viscosity of the grouting material during construction, and improve the flow and diffusion performance.

[0022] The maximum particle size of the slag, gypsum, quicklime powder and stabilizer is controlled to ensure the diffusion and penetration of the grouting material in the micro-fine cracks, and to improve the grouting effect.

[0023] Further, the water reducing agent is a high-performance water reducing agent, and the water reducing rate is greater than or equal to 30%. The water reducing agent has a surface activity effect, effectively disperses micron-sized particles such as slag and gypsum, and improves the spreadability and flow performance of the grouting material, and reduces the plastic viscosity and yield shear stress of the slurry.

[0024] The preparation method of the asphalt concrete core wall leakage treatment grouting material provided by the application comprises the following steps:

[0025] (1) The slag, gypsum, stabilizer, water reducing agent and water are poured into a mixer and mixed, and high-speed stirring is performed for 1-3 min, and the stirring speed is not less than 1200 rpm, and the first mixture is obtained after uniform stirring;

[0026] (2) The temperature of the first mixture is measured, and the emulsified asphalt is added while stirring, and slow stirring is performed for 3-5 min, and the stirring speed is not higher than 300 rpm, and the second mixture is obtained after uniform stirring;

[0027] (3) The quicklime powder is added to the second mixture, slow stirring is performed for 1-3 min, the stirring speed is not higher than 300 rpm, and the third mixture is obtained after uniform stirring, that is, the asphalt concrete core wall leakage treatment grouting material;

[0028] In step (3), the viscosity of the slurry is adjusted by the heat generated by the dissolution and heat release of the quicklime powder, and the final quicklime powder addition amount is determined according to the environmental temperature and the asphalt viscosity;

[0029] The third mixture is used for material performance test in the laboratory or for grouting construction on the engineering site.

[0030] Compared with the prior art, the application has the following beneficial effects:

[0031] (1) Excellent bonding performance with core wall asphalt concrete. The emulsified asphalt is used as the main component of the grouting material, so that the grouting material has the same material properties as the core wall asphalt concrete, the prepared grouting material has high bonding performance with the core wall asphalt concrete, and the bonding strength is greater than or equal to 2.5 MPa.

[0032] (2) Efficient diffusion and filling in micro-fine cracks. The particle size of the raw materials of the grouting material is less than 10 microns, and at the same time, under the action of the water reducing agent and the stabilizer, the flowability of the grouting material is greater than or equal to 500 mm, and the viscosity is less than or equal to 500 mPa·s, so that the grouting material can effectively diffuse and fill in cracks with a width of less than 0.1 mm.

[0033] (3) Deformation coordination with the core wall asphalt concrete. The emulsified asphalt and the low-strength alkali-activated slag system are synergistic, the elastic modulus of the grouting material formed is close to the elastic modulus of the core wall asphalt concrete, the elastic modulus of the grouting material is 20-50 MPa; the tensile deformation value is 1000-5000 με, and the tensile deformation performance is better than that of the core wall asphalt concrete. The deformation of the grouting material is coordinated with the core wall asphalt concrete, and the long-term sealing effect of the grouting material is guaranteed.

[0034] (4) Ultra-high impermeability. The asphalt concrete core wall leakage treatment grouting material of the present application adopts organic (emulsified asphalt)-inorganic (alkali-activated slag) composite, the emulsified asphalt forms a film in the matrix, the slag is consolidated after alkali activation, a rigid skeleton is formed, and excellent impermeability is produced by the combination of the two, the permeability coefficient of the prepared grouting material is far less than 1x10 -10 cm / s (the design requirement of the permeability coefficient of the asphalt core wall concrete is ≤1x10 -8 cm / s), which is 1 / 100-1 / 1000 of the core wall asphalt concrete.

[0035] (5) The low-elastic-modulus large-deformation high-impermeability asphalt concrete core wall leakage treatment grouting material is beneficial to the efficient treatment of the asphalt concrete core wall leakage site, greatly improves the leakage treatment effect, and improves the treatment efficiency. DETAILED DESCRIPTION

[0036] Hereinafter, the above-mentioned asphalt concrete core wall leakage treatment grouting material of the present application will be demonstrated by specific examples, but the following examples are only specific examples of the products and the preparation method thereof, and are not used to limit the whole.

[0037] The raw materials used are commercially available materials, and the specific manufacturers are as follows: the emulsified asphalt is produced by Shanghai Chengjian Ri Bit Special Asphalt Co., Ltd., the slag is produced by Maanshan Iron and Steel Co., Ltd., the gypsum is produced by Hubei Longyuan Gypsum (Group) Co., Ltd., the quicklime powder is produced by Shandong Zhongfutai Industrial Co., Ltd., the colloidal attapulgite is produced by Guoxing Attapulgite Clay Factory, the high-performance water reducing agent is produced by Nanjing Ruide Construction Technology Co., Ltd., and the water is ordinary drinking tap water.

[0038] In the following examples and comparative examples, unless otherwise specified, the emulsified asphalt has a demulsification time ≥60 min, a Dmax≤5 μm, a solid content ≥60%, and an Engler viscosity of 1-20 s; the slag is S125 grade superfine slag with a specific surface area ≥700 m 2 / kg; the gypsum is semi-hydrated gypsum of medium β type with a Dmax≤10 μm; the quicklime powder has a Dmax≤10 μm; the colloidal attapulgite has a dynamic viscosity ≤500 mPa·s and a Dmax≤5 μm; and the water reducing rate of the water reducing agent is ≥30%. The amount of each component in each example and comparative example is measured by mass parts. Example 1

[0039] The preparation method of the asphalt concrete core wall leakage treatment grouting material described in this embodiment includes:

[0040] First, take 25 parts of emulsified asphalt, 80 parts of slag, 4 parts of gypsum, 3 parts of quicklime powder, 2 parts of stabilizer, 1 part of water reducing agent, and 70 parts of water;

[0041] Then, pour the weighed slag, gypsum, stabilizer, water reducing agent, and water into the mixer and mix at high speed for 1 min, with a stirring speed of 1200 rpm;

[0042] Secondly, prepare the emulsified asphalt and add it while stirring, slow stirring for 3 min, stirring speed 300 rpm;

[0043] Fourthly, prepare the quicklime powder and add it while stirring, slow stirring for 3 min, stirring speed not higher than 300 rpm;

[0044] Finally, test the fluidity and viscosity of the freshly mixed slurry; place the freshly mixed slurry in the test mold for 3 days, cover it with plastic film to prevent water evaporation during this period, and after demolding, place it in the curing room for normal temperature curing until the test age. Example 2

[0045] The preparation method of the asphalt concrete core wall leakage treatment grouting material described in this embodiment includes:

[0046] First, take 15 parts of emulsified asphalt, 90 parts of slag, 2 parts of gypsum, 4 parts of quicklime powder, 1.5 parts of stabilizer, 0.5 parts of water reducing agent, and 80 parts of water;

[0047] Then, pour the weighed slag, gypsum, stabilizer, water reducing agent, and water into the mixer and mix at high speed for 2 min, with a stirring speed of 1200 rpm;

[0048] Secondly, prepare the emulsified asphalt and add it while stirring, slow stirring for 4 min, stirring speed 300 rpm;

[0049] Fourthly, prepare the quicklime powder and add it while stirring, slow stirring for 2 min, stirring speed not higher than 300 rpm;

[0050] Finally, test the fluidity and viscosity of the freshly mixed slurry; place the freshly mixed slurry in the test mold for 3 days, cover it with plastic film to prevent water evaporation during this period, and after demolding, place it in the curing room for normal temperature curing until the test age. Example 3

[0051] The preparation method of the asphalt concrete core wall leakage treatment grouting material described in this embodiment includes:

[0052] First, take 5 parts of emulsified asphalt, 90 parts of slag, 1 part of gypsum, 5 parts of quicklime powder, 1 part of stabilizer, 0.5 parts of water reducing agent, and 100 parts of water;

[0053] Then, pour the weighed slag, gypsum, stabilizer, water reducing agent, and water into the mixer and mix at high speed for 1 min, with a stirring speed of 1200 rpm;

[0054] Again, prepare the emulsified asphalt and add it while stirring, slow stirring for 3 min, with a stirring speed of 300 rpm;

[0055] Fourthly, prepare the quicklime powder and add it while stirring, slow stirring for 3 min, with a stirring speed not higher than 300 rpm;

[0056] Finally, test the flowability and viscosity of the freshly mixed slurry; place the freshly mixed slurry in the test mold for 3 d, cover it with plastic film during this period to prevent water evaporation, and after demolding, place it in the curing room for normal temperature curing until the test age. Example 4

[0057] The preparation method of the grouting material for treating leakage of the asphalt concrete core wall in this example includes:

[0058] First, take 30 parts of emulsified asphalt, 70 parts of slag, 5 parts of gypsum, 1 part of quicklime powder, 3 parts of stabilizer, 2 parts of water reducing agent, and 50 parts of water;

[0059] Then, pour the weighed slag, gypsum, stabilizer, water reducing agent, and water into the mixer and mix at high speed for 1 min, with a stirring speed of 1200 rpm;

[0060] Again, prepare the emulsified asphalt and add it while stirring, slow stirring for 3 min, with a stirring speed of 300 rpm;

[0061] Fourthly, prepare the quicklime powder and add it while stirring, slow stirring for 3 min, with a stirring speed not higher than 300 rpm;

[0062] Comparative Example 1

[0063] The preparation method of the grouting material in this comparative example includes:

[0064] First, take 25 parts of water-based epoxy emulsion, 90 parts of P.O 42.5 ordinary portland cement, 1 part of water reducing agent, and 70 parts of water;

[0065] Then, weigh the waterborne epoxy emulsion, ordinary Portland cement, water reducer, water, pour into the blender and mix, high speed stirring 1 min, stirring speed 1200 rpm;

[0066] Finally, the flowability and viscosity of the freshly mixed grout were tested; the freshly mixed grout was placed in a test mold for 3 d, covered with plastic film during the period to prevent water evaporation, and demolded and placed in a curing room for normal temperature curing until the test age.

[0067] Comparative Example 2

[0068] The preparation method of the grouting material of the present comparative example comprises:

[0069] First, weigh 15 parts of emulsified asphalt, 90 parts of slag, 2 parts of gypsum, 4 parts of quicklime powder, 1.5 parts of bentonite, 0.5 parts of water reducer, and 80 parts of water;

[0070] Then, weigh the slag, gypsum, bentonite, water reducer, and water, pour into the blender and mix, high speed stirring 2 min, stirring speed 1200 rpm;

[0071] Again, prepare the emulsified asphalt, add while stirring, slow stirring 4 min, stirring speed 300 rpm;

[0072] Fourthly, prepare the quicklime powder, add while stirring, slow stirring 2 min, stirring speed not higher than 300 rpm;

[0073] Finally, the flowability and viscosity of the freshly mixed grout were tested; the freshly mixed grout was placed in a test mold for 3 d, covered with plastic film during the period to prevent water evaporation, and demolded and placed in a curing room for normal temperature curing until the test age.

[0074] Comparative Example 3

[0075] The preparation method of the grouting material of the present comparative example comprises:

[0076] First, weigh 15 parts of emulsified asphalt, 90 parts of slag, 2 parts of gypsum, 4 parts of quicklime powder, 1.5 parts of bentonite, 0.5 parts of water reducer, and 80 parts of water;

[0077] Then, weigh the slag, gypsum, bentonite, water reducer, and water, pour into the blender and mix, high speed stirring 2 min, stirring speed 1200 rpm;

[0078] Again, prepare the emulsified asphalt, add while stirring, slow stirring 4 min, stirring speed 300 rpm;

[0079] Finally, the flowability and viscosity of the fresh grout are tested; the fresh grout is loaded into a test mold and left for 3 days, during which time it is covered with plastic film to prevent moisture evaporation, and after demolding, it is placed in a curing chamber for normal temperature curing until the test age.

[0080] Comparative Example 4

[0081] The preparation method of the grouting material in this comparative example comprises:

[0082] First, 5 parts of emulsified asphalt, 90 parts of slag, 5 parts of quicklime powder, 1 part of stabilizer, 0.5 parts of water reducing agent, and 100 parts of water are weighed;

[0083] Then, the weighed slag, stabilizer, water reducing agent, and water are poured into a mixer and mixed at a high speed for 1 min, and the stirring speed is 1200 rpm;

[0084] Again, emulsified asphalt is prepared and added while stirring, and slow stirring is performed for 3 min at a stirring speed of 300 rpm;

[0085] Fourthly, quicklime powder is prepared and added while stirring, and slow stirring is performed for 3 min at a stirring speed of not higher than 300 rpm;

[0086] Finally, the flowability and viscosity of the fresh grout are tested; the fresh grout is loaded into a test mold and left for 3 days, during which time it is covered with plastic film to prevent moisture evaporation, and after demolding, it is placed in a curing chamber for normal temperature curing until the test age.

[0087] Comparative Example 5

[0088] The same type of raw materials and preparation process as in Example 4 are used, and the difference from Example 4 is that the slag is S115 grade, the specific surface area is 610 m 2 / kg, the gypsum is medium β-type hemihydrate gypsum, D max ≥45 μm, and the 45 μm square hole screen residue is 14.5%; the quicklime powder is D max ≥45 μm, and the 45 μm square hole screen residue is 9.7%; the colloidal-grade attapulgite has a dynamic viscosity of 350 mPa·s, D max ≥45 μm, and the 45 μm square hole screen residue is 10.3%.

[0089] The performance of the asphalt concrete core wall leakage treatment grouting materials obtained in the above examples and the grouting materials obtained in the comparative examples was determined by the same test method. Specifically, the viscosity test was carried out according to GB / T 43876-2024 "Cement paste viscosity determination method"; the cone flow degree test was carried out according to JC / T 986-2018 "Cement-based grouting material"; the bonding strength test was carried out according to "10 Tensile bonding strength test" in JGJ / T 70-2009 "Standard for basic performance test methods of building mortar", wherein the base test piece was asphalt concrete (the asphalt content of the base asphalt concrete was 7.0%, the volume density was 2.4410 g / cm 3 , the density was 2.4755 g / cm 3 , the porosity was 1.40%, the Marshall test stability was 12.48 kN, the flow value (1 / 100 cm) was 114.7, the elastic modulus was 27.55 MPa, the tensile deformation was 1800x10 -6 , the permeability coefficient was 32.3x10 -10 cm / s); the elastic modulus test was carried out according to "16 Static compressive elastic modulus test" in JGJ / T 70-2009; the tensile performance test was carried out according to "9.10 Mortar axial tensile test" in SL / T325-2020 "Test code for hydraulic concrete"; the permeability coefficient test was carried out according to "7.15 Roller compacted concrete permeability coefficient test" in SL / T325-2020.

[0090] The performance of the asphalt concrete core wall leakage treatment grouting materials provided in the above examples 1-4 and the grouting materials obtained in the comparative examples 1-5 is shown in Table 1 below.

[0091] Table 1 Performance of grouting materials of examples and comparative examples

[0092]

[0093] From the results in the above Table 1, it can be found that:

[0094] Compared with example 1, comparative example 1 uses water-based epoxy emulsion and ordinary Portland cement as main components, which is a typical epoxy-cement grouting material. The flow degree of comparative example 1 is significantly reduced, the viscosity is increased, the workability is reduced, and the construction difficulty is increased; the bonding strength with the base asphalt concrete mixture is reduced by nearly 40%, the tensile deformation is only about 1 / 4 of that of example 1, the elastic modulus is basically the same, the permeability coefficient is increased by 65 times, and the long-term anti-seepage and leakage plugging capacity cannot be guaranteed.

[0095] Comparative Example 2 uses bentonite as stabilizer. The flowability of Comparative Example 2 is significantly reduced, the viscosity is increased, the workability is reduced, and the construction difficulty is increased; the bonding strength, tensile deformation, and elastic modulus of the asphalt concrete mixture with the base are basically the same; the permeability coefficient is increased by 1.5 times. The continuous water absorption of bentonite is strong, and the viscosity of the grouting material increases with time, which reduces the penetration and diffusion capacity of the grouting material in the micro-fissure, and the plugging effect is significantly reduced.

[0096] Comparative Example 3 has no quicklime. The flowability of Comparative Example 3 is reduced by about 50%, the viscosity is increased by about 3.5 times, the workability is reduced, and the construction difficulty is increased; the bonding strength and tensile deformation of the asphalt concrete mixture with the base are reduced by more than 20%, the elastic modulus is reduced by about 10%, the deformation compatibility and long-term durability are reduced; the permeability coefficient is increased by 0.5 times. In Comparative Example 3, the hydration heat effect of the slurry in the slurry makes the viscosity of the slurry increase, the grouting property is reduced, the penetration and diffusion capacity of the slurry in the micro-fissure is weakened, and the anti-permeability of the grouting part is reduced.

[0097] Comparative Example 4 has no gypsum. The flowability of Comparative Example 4 is slightly increased, the viscosity is slightly reduced, the amount of powder in the grouting material is reduced, the water-cement ratio is increased, and the workability is slightly improved; the bonding strength and tensile deformation of the asphalt concrete mixture with the base are significantly reduced by about 50%; the elastic modulus is reduced by about 15%; the permeability coefficient is increased by about 1.1 times. In Comparative Example 4, the absence of gypsum significantly weakens the alkali activation effect of the slag, which significantly reduces the mechanical properties, deformation properties, and durability of the grouting material.

[0098] Comparative Example 5 has the same raw materials and preparation process as Example 4, but the particle size of the slag, gypsum, quicklime powder, and stabilizer is increased. The flowability of Comparative Example 5 is reduced by about 50%, the viscosity is increased by more than 3 times, and the workability is significantly reduced; the bonding strength of the asphalt concrete mixture with the base is reduced by about 30%, the tensile deformation is reduced by more than 50%, the elastic modulus is increased by about 30%, the stiffness of the grouting material is increased, and the deformation performance is reduced; the permeability coefficient is increased by about 560 times, and the anti-permeability and plugging effect is significantly reduced. In Comparative Example 5, the powder particle size in the grouting material is increased, which on the one hand increases the grouting construction difficulty, and on the other hand, the large particles cannot be grouted into the micro-fissure, which reduces the saturation degree of the grouting material in the fissure and the compactness, and the fissure cannot be completely grouted. The powder particle size in the grouting material is too large, which significantly reduces the workability, deformation performance, and grouting compactness of the grouting material.

[0099] The embodiments of the present application form a grouting material by emulsified asphalt and low-strength alkali-activated slag system, the elastic modulus of the grouting material is close to that of the core wall asphalt concrete, and the tensile deformation performance is better than that of the core wall asphalt concrete. Compared with the comparative example, the asphalt concrete core wall leakage treatment grouting material obtained by using organic (emulsified asphalt)-inorganic (alkali-activated slag) composite has low viscosity, reduced construction difficulty, and excellent tensile deformation performance, impermeability and the like.

Claims

1. An asphaltic concrete core wall seepage disposal grout material, characterized by, The invention relates to a kind of asphalt concrete core wall leakage treatment grouting material, comprising the following components mixed by mass fraction: Emulsified asphalt 5~30 parts, Slag 70~90 parts, Gypsum 1~5 parts, Quicklime powder 1~5 parts, Stabilizer 1~3 parts, Water reducing agent 0.5~2 parts, Water 50~100 parts; The slag is S125 grade superfine slag, specific surface area ≥700m 2 / kg; The gypsum is β-type hemihydrate gypsum, Dmax≤10 μm; The quicklime powder Dmax≤10 μm; The stabilizer is colloidal grade attapulgite, the dynamic viscosity of which is ≤500 mPa·s, and Dmax≤5 μm.

2. The asphalt concrete core wall leakage treatment grouting material according to claim 1, characterized in that, The emulsified asphalt has demulsification time ≥60 min, Dmax≤5 μm, solid content ≥60%, and Engler viscosity 1-20 s.

3. The asphalt concrete core wall leakage treatment grouting material according to claim 1, characterized in that, The water reducing agent is high-performance water reducing agent, with water-reducing rate ≥30%.

4. A method of preparing the asphalt concrete core wall leakage treatment grouting material according to any one of claims 1 to 3, characterized by, The invention also relates to a kind of preparation method of the asphalt concrete core wall leakage treatment grouting material, comprising the following steps: (1) mixing slag, gypsum, stabilizer, water reducing agent, water in a mixer, and stirring uniformly at high speed to obtain a first mixture; (2) measuring the temperature of the first mixture, and adding emulsified asphalt while stirring, and stirring uniformly at low speed to obtain a second mixture; (3) adding quicklime powder to the second mixture, and stirring uniformly at low speed to obtain a third mixture, which is the asphalt concrete core wall leakage treatment grouting material.

5. The preparation method according to claim 4, characterized in that, The stirring time in step (1) is 1-3 min, and the stirring speed is not less than 1200 rpm; The stirring time in step (2) is 3-5 min, and the stirring speed is not higher than 300 rpm; The stirring time in step (3) is 1-3 min, and the stirring speed is not higher than 300 rpm.

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