Dispersion-resistant cement-based grouting material as well as preparation method and application thereof

Abstract

The invention discloses an anti-dispersion cement-based grouting material as well as a preparation method and application thereof. The anti-dispersion cement-based grouting material is prepared from the following components in parts by weight: 1000 to 1500 parts of cement, 0.1 to 1.5 parts of an organic early strength agent, 1 to 15 parts of an inorganic early strength agent, 5 to 15 parts of a plastic stabilizer, 0.14 to 0.47 part of an anti-dispersion agent and 900 to 1250 parts of water. The cement, the organic early strength agent, the inorganic early strength agent, the plastic stabilizer and the anti-dispersing agent are reasonably compounded, so that the water-encountering anti-dispersing capacity of the cement-based grouting material can be greatly improved, the early breaking strength and compressive strength are improved, the stability of slurry during long-distance pumping is remarkably improved, and the application range is wide.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering materials, and in particular relates to an anti-dispersion cement-based grouting material and a preparation method and application thereof. Background Art

[0002] As an important part of large-scale water diversion projects, hydraulic high-pressure tunnels are prone to major geological disasters such as sudden water inrush during construction due to the combined effects of super-high water heads and unfavorable geological bodies, causing casualties and property losses, and seriously affecting the construction period. How to take effective measures to quickly block water inrush has become a key issue affecting the construction of hydraulic tunnels. As the main technical means for tunnel sudden water inrush control, advanced grouting has achieved remarkable results in the control of sudden water inrush disasters. Therefore, research on anti-dispersion grouting materials has been carried out, and grouting materials with strong anti-dispersion ability and good performance under dynamic water conditions have been developed to block sudden water inrush encountered during tunnel construction, which is of great significance to improving the grouting and water blocking effect.

[0003] At present, grouting water blocking materials mainly include cement-based grouting materials and chemical grouting materials such as epoxy resin, polyurethane, acrylate and water glass. In general, compared with chemical grouting materials, cement-based grouting materials have significant advantages in price, but cement-based grouting materials have long setting time, low early strength, and are easily dispersed by passive water erosion under water inrush conditions. Therefore, it is necessary to overcome the shortcomings of cement-based grouting materials and improve the comprehensive performance of grouting materials under sudden water inrush conditions, in order to develop a low-cost, overall good performance anti-dispersion cement-based grouting material. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide an anti-dispersion cement-based grouting material and a preparation method and application thereof, so as to solve the technical problems that the current cement-based grouting materials are easily dispersed by passive water erosion under sudden water conditions and have insufficient mechanical properties.

[0005] To achieve the above object, the present invention is implemented through the following technical solutions: In a first aspect, the present invention provides an anti-dispersion cement-based grouting material, comprising, by weight: 1000-1500 parts of cement, 0.1-1.5 parts of organic early strength agent, 1-15 parts of inorganic early strength agent, 5-15 parts of plastic stabilizer, 0.14-0.47 parts of anti-dispersion agent and 900-1250 parts of water.

[0006] Preferably, the cement is Portland cement.

[0007] Preferably, the organic early strength agent is one or more of urea, alcohols, alcoholamines, and organic acid salt compounds.

[0008] Preferably, the alcohol compound is one or more of methanol, ethanol, and ethylene glycol; the alcoholamine compound is one or more of triisopropanolamine, diethanolamine, and triethanolamine; and the organic acid salt compound is one or more of sodium formate and sodium hydroxycarboxylate.

[0009] Preferably, the inorganic early strength agent is one or more of chlorides, sulfates, and silicates. For example, the chloride is one or more of sodium chloride, potassium chloride, ferric chloride, and aluminum chloride; the sulfate is one or more of sodium sulfate, potassium sulfate, and calcium sulfate; and the silicate is sodium silicate.

[0010] Preferably, the inorganic early strength agent is one or more of lithium salts and inorganic calcium salts. For example, the lithium salt is one or more of lithium carbonate and lithium nitrate; the inorganic calcium salt is one or more of calcium chloride and calcium nitrate.

[0011] Preferably, the plastic stabilizer is one or more of cellulose ether, methyl cellulose, hydroxyethyl methyl cellulose, carboxymethyl cellulose, ethyl cellulose, benzyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, cyanoethyl cellulose, carboxymethyl hydroxyethyl cellulose, and phenyl cellulose.

[0012] Preferably, the anti-dispersion agent is one or more of nonionic polyacrylamide, cationic polyacrylamide, anionic polyacrylamide, and amphoteric polyacrylamide.

[0013] In a second aspect, the present invention provides a method for preparing an anti-dispersion cement-based grouting material, comprising the following steps: Weigh cement, organic early strength agent, inorganic early strength agent, plastic stabilizer, anti-dispersion agent and water according to the formula; The cement, the organic early strength agent, the inorganic early strength agent, the plastic stabilizer, the anti-dispersion agent and water are uniformly mixed to obtain the anti-dispersion cement-based grouting material.

[0014] In a third aspect, the present invention provides an application of the above-mentioned anti-dispersion cement-based grouting material in advance plugging of groundwater, for example, in the construction of underground projects such as hydraulic tunnels, traffic tunnels, water and gas transmission projects, etc.

[0015] The beneficial effects of the present invention are: The present invention reasonably compounds cement, organic early strength agent, inorganic early strength agent, plastic stabilizer and anti-dispersion agent to obtain an anti-dispersion cement-based grouting material, which has significantly improved mechanical properties and anti-dispersion ability in water compared with ordinary cement-based grouting materials, and can be used as an advanced pretreatment material in the construction process of hydraulic high-pressure tunnels, greatly improving the effect of grouting materials in blocking sudden water inrush, and reducing or avoiding the occurrence of adverse geological disasters during tunnel construction. The anti-dispersion cement-based grouting material obtained by the present invention also has good stability and fluidity, effectively avoiding the occurrence of segregation and bleeding when the slurry is pumped over long distances, and has low production costs, which is conducive to large-scale application. DETAILED DESCRIPTION

[0016] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] Example 1 An anti-dispersion cement-based grouting material is prepared by slowly stirring 1500 parts of silicate cement, 0.45 parts of an organic early strength agent, 4.5 parts of an inorganic early strength agent, 15 parts of a plastic stabilizer, 0.14 parts of an anti-dispersion agent and 900 parts of water in a planetary mortar mixer for 240 seconds. The organic early strength agent is triisopropanolamine, the inorganic early strength agent is sodium chloride, the plastic stabilizer is hydroxyethyl methylcellulose, and the anti-dispersion agent is nonionic polyacrylamide.

[0018] Example 2 An anti-dispersion cement-based grouting material is prepared by slowly stirring 1333 parts of silicate cement, 0.40 parts of an organic early strength agent, 4.0 parts of an inorganic early strength agent, 13.3 parts of a plastic stabilizer, 0.16 parts of an anti-dispersion agent and 1067 parts of water in a planetary mortar mixer for 240 seconds. The organic early strength agent is diethanolamine, the inorganic early strength agent is sodium sulfate, the plastic stabilizer is hydroxyethyl methylcellulose, and the anti-dispersion agent is cationic polyacrylamide.

[0019] Example 3 An anti-dispersion cement-based grouting material is prepared by slowly stirring 1500 parts of silicate cement, 0.45 parts of an organic early strength agent, 4.5 parts of an inorganic early strength agent, 7.5 parts of a plastic stabilizer, 0.34 parts of an anti-dispersion agent and 900 parts of water in a planetary mortar mixer for 240 seconds. The organic early strength agent is triethanolamine, the inorganic early strength agent is potassium chloride, the plastic stabilizer is hydroxypropyl methylcellulose, and the anti-dispersion agent is cationic polyacrylamide.

[0020] Example 4 An anti-dispersion cement-based grouting material is prepared by slowly stirring 1333 parts of silicate cement, 0.40 parts of an organic early strength agent, 4.0 parts of an inorganic early strength agent, 6.7 parts of a plastic stabilizer, 0.4 parts of an anti-dispersion agent and 967 parts of water in a planetary mortar mixer for 240 seconds. The organic early strength agent is diethanolamine, the inorganic early strength agent is sodium chloride, the plastic stabilizer is hydroxypropyl methylcellulose, and the anti-dispersion agent is cationic polyacrylamide.

[0021] Comparative Example 1 1500 parts of Portland cement and 900 parts of water were slowly stirred in a planetary mortar mixer for 240 s to obtain ordinary cement-based grouting material.

[0022] Performance Testing The test samples were prepared as follows: (1) Place a stainless steel test mold with dimensions of 40 mm × 40 mm × 160 mm in a water tank and add water to the tank until it reaches 10 cm above the upper surface of the test mold.

[0023] (2) Pour the cement-based grouting materials prepared in the example and the comparative example into plastic measuring cups respectively, and pour the cement-based grouting materials from the water surface into the test mold through a PVC pipe until the pouring amount exceeds the surface of the test mold.

[0024] (3) Take the test mold obtained in step (2) out of the sink and smooth it.

[0025] (4) Place the test mold obtained in step (3) into water again and cure it in water for 1 day.

[0026] (5) Take the test mold obtained in step (4) out of the water, demould it, and obtain the sample.

[0027] (6) The sample obtained in step (5) is placed in water and cured for 28 days to obtain an underwater molded test sample.

[0028] (1) Compressive strength and flexural strength: GB / T 17671-2021 "Test method for strength of cement mortar (ISO method)" is used for testing.

[0029] (2) Water separation rate 1) Prepare samples. Take a certain amount of cement-based grouting material slurry obtained in Examples 1 to 4 and Comparative Example 1 respectively.

[0030] 2) Measure the initial volume. Pour the cement-based grouting material paste into the measuring cylinder and accurately record its initial volume.

[0031] 3) Stand still for observation. Place the container containing cement-based grouting material slurry in a horizontal, vibration-free environment. Observe and record the volume of precipitated water every half an hour until the precipitated water process becomes stable.

[0032] 4) Calculate the single water separation rate. Calculate the single water separation rate based on the recorded volume of precipitated water and the volume of the initial cement paste.

[0033] Water separation rate = (volume of separated water / volume of initial cement paste) × 100% 5) Repeat the test. Repeat the above test three times and take the average value to get the final water extraction rate result.

[0034] The stability and working performance of cement paste can be evaluated based on the calculated average water separation rate. When the water separation rate is less than 5%, it is usually regarded as a stable slurry.

[0035] (3) Expansion: Tested in accordance with GB / T 50080-2016 "Standard for Test Methods for Performance of Ordinary Concrete Mixtures" (4) Anti-dispersion performance in water 1) Test equipment and materials Iron barrel: height 550mm, diameter 400mm, wall thickness 1~2mm.

[0036] Wide-mouth container: outer diameter 110mm, height 150mm, volume 1500mL.

[0037] Acidity meter: pHS-2 acidity meter.

[0038] Electrode: including pH glass electrode, calomel electrode and composite electrode.

[0039] Graduated cylinder: one 200mL and one 500mL.

[0040] Beaker: 1000mL.

[0041] Balance: The measuring range is not less than 2kg, and the sensitivity is not more than 0.1g; the measuring range is not less than 100g, and the sensitivity is 0.0001g.

[0042] Drying oven: can achieve 105~110℃ temperature control.

[0043] Others: filter pump, ear bulb, filter paper, rubber stopper, etc.

[0044] 2) Test steps Determination of loss: Place a wide-mouth container at the bottom of a sheet metal barrel with a water depth of 500 mm. Weigh about 2 kg of cement-based grouting material and pour it freely from the water surface into the wide-mouth container in the water. After standing for 5 minutes, lift the wide-mouth container from the water, drain the water on the surface of the concrete, weigh its mass and calculate the loss. Repeat the above operation three times, take the average value of each time, and calculate it to the nearest 0.1%.

[0045] Determination of suspended matter and pH value: Add 800mL of water to a 1000mL beaker, then divide 500g of cement-based grouting material into 10 equal parts, and use a hand shovel to slowly and freely drop each part of the material from the water surface. This operation should be completed within 10-20 seconds. After standing for 3 minutes, use an ear bulb to absorb 600mL of water from the water surface within 1 minute as the test sample (keep the sample in the beaker still while absorbing water). Take out 200mL of the 600mL of water sucked out to test its pH value, and the remaining water samples are tested for suspended matter content.

[0046] 3) Evaluation criteria When the cement loss is less than 1.5%, the suspended matter content is less than 150 mg / L, and the pH value is less than 12, it indicates that the anti-dispersion property of the cement-based grouting material when exposed to water is non-dispersible.

[0047] The test results are shown in Table 1: Table 1 Test results of anti-dispersion cement-based grouting material properties

[0048] As shown in Table 1, compared with ordinary cement-based grouting materials, the 3-day and 28-day flexural strength and compressive strength of the anti-dispersion cement-based grouting materials prepared in Examples 1-4 of the present invention are significantly improved; the water separation rate of the grouting material is less than 5%, and it has both stability and fluidity, meeting the long-distance pumping performance requirements, and the anti-dispersion performance of the material in contact with water is significantly improved. Comprehensive comparison of the results in Table 1 shows that the various properties of the anti-dispersion cement-based grouting material are significantly better than those of the ordinary cement-based grouting material, among which the mechanical properties of Examples 3 and 4 are better.

[0049] The invention can be used for projects such as concrete structure leakage plugging, surrounding rock reinforcement, sudden water plugging and curtain anti-seepage in the fields of water conservancy, hydropower, construction, transportation, etc.

[0050] It should be noted that the above embodiments all belong to the same inventive concept, and the description of each embodiment has its own focus. For matters that are not described in detail in some embodiments, reference may be made to the description in other embodiments.

[0051] The above-mentioned embodiments only express the implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An anti-dispersion cement-based grouting material, characterized in that: Calculated by weight, it includes: 1000-1500 parts of cement, 0.1-1.5 parts of organic early strength agent, 1-15 parts of inorganic early strength agent, 5-15 parts of plastic stabilizer, 0.14-0.47 parts of anti-dispersion agent and 900-1250 parts of water.

2. The anti-dispersion cement-based grouting material according to claim 1, characterized in that: The cement is silicate cement.

3. The anti-dispersion cement-based grouting material according to claim 1, characterized in that: The organic early strength agent is one or more of urea, alcohols, alcohol amines, and organic acid salt compounds.

4. The anti-dispersion cement-based grouting material according to claim 3, characterized in that: The alcohol compound is one or more of methanol, ethanol, and ethylene glycol; the amine compound is one or more of triisopropanolamine, diethanolamine, and triethanolamine; and the organic acid salt compound is one or more of sodium formate and sodium hydroxycarboxylate.

5. The anti-dispersion cement-based grouting material according to claim 1, characterized in that: The inorganic early strength agent is one or more of chlorides, sulfates and silicates.

6. The anti-dispersion cement-based grouting material according to claim 1, characterized in that: The inorganic early strength agent is one or more of lithium salt and inorganic calcium salt.

7. The anti-dispersion cement-based grouting material according to claim 1, characterized in that: The plastic stabilizer is one or more of cellulose ether, methyl cellulose, hydroxyethyl methyl cellulose, carboxymethyl cellulose, ethyl cellulose, benzyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, cyanoethyl cellulose, carboxymethyl hydroxyethyl cellulose and phenyl cellulose.

8. The anti-dispersion cement-based grouting material according to claim 1, characterized in that: The anti-dispersant is one or more of nonionic polyacrylamide, cationic polyacrylamide, anionic polyacrylamide and amphoteric polyacrylamide.

9. The method for preparing the anti-dispersion cement-based grouting material according to any one of claims 1 to 8, characterized in that: The following steps are involved: Weigh cement, organic early strength agent, inorganic early strength agent, plastic stabilizer, anti-dispersion agent and water according to the formula; Cement, an organic early strength agent, an inorganic early strength agent, a plastic stabilizer, an anti-dispersion agent and water are uniformly mixed to obtain the anti-dispersion cement-based grouting material.

10. Use of the anti-dispersion cement-based grouting material according to any one of claims 1 to 8 in advance plugging of groundwater.

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