A kind of anti-dynamic water double liquid synchronous grouting material and preparation method thereof

Abstract

The present invention discloses a dual-liquid synchronous grouting material for resisting water movement and a preparation method thereof, belonging to the technical field of grouting materials. The dual-liquid synchronous grouting material for resisting water movement provided by the present invention comprises liquid A and liquid B in a volume ratio of (4-6):1. In parts by weight, the liquid A comprises 18-22 parts of cement, 18-22 parts of fly ash, 35-45 parts of fine sand, 0.3-0.5 parts of a water reducer and 35-45 parts of water. The liquid B comprises 4-7 parts of polyaluminum sulfate, 2-4 parts of aluminum oxide, 2-4 parts of hydroxypropyl methylcellulose, 1-3 parts of calcium hydroxide, 0.3-0.7 parts of triethanolamine, 0.3-0.6 parts of fatty alcohol polyoxyethylene ether, 0.8-1.2 parts of polyacrylamide and 95-105 parts of water. The dual-liquid synchronous grouting material for resisting water movement not only has good water scouring resistance, but also has a suitable setting time, which can meet the requirements of rapid setting and hardening while ensuring sufficient construction time, and has good application prospects.

Description

Technical Field

[0001] The invention relates to the technical field of grouting materials, in particular to a water-resistant double-liquid synchronous grouting material and a preparation method thereof. Background Art

[0002] The information disclosed in the background of the invention is only intended to enhance understanding of the overall background of the invention and should not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] Grouting involves using pressure-delivered equipment to inject a cementitious material into underground cracks and cavities, causing it to diffuse, gel, and solidify. This process fills cavities, reinforces strata, or prevents seepage and leaks. Synchronous grouting behind the wall is a key element of modern shield construction. Due to karst geological processes, numerous pores, fissures, caves, and even underground rivers are easily formed in spring or karst strata. Some of these water-rich areas even host dynamic water environments, making synchronous grouting extremely difficult when the shield advances into these areas.

[0004] Double-liquid grouting is a relatively new grouting method in which two different slurries are introduced into a slurry mixing device through two grouting pressure units and two grouting pipes, and then injected into the target formation after being mixed. Currently, many high-performance grouting materials with organic polymers as the main agent have been reported, but there are fewer studies on double-liquid grouting materials for dynamic water conditions. Existing double-liquid grouting materials are difficult to simultaneously meet many requirements in terms of setting time and strength. In addition, some existing slurry ingredients contain toxic substances. If used in water-rich environments, they are bound to have an impact on the environment. Therefore, it is particularly important to develop dynamic water-resistant double-liquid synchronous grouting materials with low environmental pollution, suitable setting time and high strength to solve the slurry material problem of shield synchronous grouting. Summary of the Invention

[0005] In view of this, the present invention provides a water-resistant two-liquid synchronous grouting material and a preparation method thereof, which solves the problem that the existing two-liquid grouting materials are difficult to meet the requirements of grouting materials under water-rich conditions. The water-resistant two-liquid synchronous grouting material provided by the present invention has a suitable setting time and can quickly set and harden in a dynamic water environment. At the same time, it has good water scouring resistance and little impact on the environment.

[0006] In the first aspect, the present invention provides an anti-dynamic water double-liquid synchronous grouting material, which includes liquid A and liquid B in a volume ratio of (4-6):1. Calculated by weight, the liquid A includes 18-22 parts of cement, 18-22 parts of fly ash, 35-45 parts of fine sand, 0.3-0.5 parts of water reducer and 35-45 parts of water; the liquid B includes 4-7 parts of polyaluminum sulfate, 2-4 parts of aluminum oxide, 2-4 parts of hydroxypropyl methylcellulose, 1-3 parts of calcium hydroxide, 0.3-0.7 parts of triethanolamine, 0.3-0.6 parts of fatty alcohol polyoxyethylene ether, 0.8-1.2 parts of polyacrylamide and 95-105 parts of water.

[0007] Preferably, the volume ratio of liquid A to liquid B is 5:1.

[0008] Preferably, the liquid A comprises 20 parts of cement, 20 parts of fly ash, 20 parts of fine sand, 0.4 parts of water reducer and 40 parts of water.

[0009] Preferably, the liquid B comprises 5-7 parts of polyaluminum sulfate, 3 parts of aluminum oxide, 3 parts of hydroxypropyl methylcellulose, 1-2 parts of calcium hydroxide, 0.5 parts of triethanolamine, 0.5 parts of fatty alcohol polyoxyethylene ether, 1 part of polyacrylamide and 100 parts of water.

[0010] Preferably, the cement is Portland cement.

[0011] Furthermore, the type of the silicate cement is P·I type.

[0012] Preferably, the fly ash is Class F, Grade I low-calcium fly ash, with a CaO content of less than 10 wt% or a free CaO content of no more than 1 wt%.

[0013] Furthermore, the fineness of the fly ash meets the requirement that the residue on a 45 μm square hole sieve is no more than 12%.

[0014] Preferably, the fineness modulus of the fine sand is 2.2 to 1.6.

[0015] Preferably, the water reducer is an ether polycarboxylate water reducer.

[0016] In a second aspect, the present invention provides a method for preparing the above-mentioned anti-dynamic water dual-liquid synchronous grouting material, comprising the following steps:

[0017] Weigh cement, fly ash, fine sand, water reducer and water in proportion and mix them evenly to obtain Liquid A.

[0018] Weigh polyaluminum sulfate, aluminum oxide, hydroxypropyl methylcellulose, calcium hydroxide, triethanolamine, fatty alcohol polyoxyethylene ether, polyacrylamide and water in proportion and mix well to obtain solution B;

[0019] Before use, mix the liquid A and the liquid B in a volume ratio of (4-6):1 to obtain the product.

[0020] Compared with the prior art, the present invention has achieved the following beneficial effects:

[0021] The anti-dynamic water dual-liquid synchronous grouting material provided by the present invention uses traditional cement slurry as liquid A and a polymer solution containing polyacrylamide as liquid B. Polyacrylamide can promote the coagulation of the mixed slurry and greatly improve the water scouring resistance of the grouting material. An appropriate amount of fatty alcohol polyoxyethylene ether is used as an emulsifier to moderately slow down the coagulation rate and avoid the adverse effect of too fast coagulation rate on construction. Triethanolamine is used to increase the fluidity of the mixed slurry; hydroxypropyl methylcellulose is used to improve the overall polymerization and increase the dynamic water retention rate; and polyaluminum sulfate, aluminum oxide and calcium hydroxide are used to accelerate the mixing progress of liquids A and B and increase the overall construction workability. The anti-dynamic water two-liquid synchronous grouting material of the present invention not only has good water scouring resistance through the synergistic effect of various components, but also has a dynamic water retention rate of more than 65% at 0.8 m / s, and also has a suitable setting time, with an initial setting time of 25 to 50 seconds and a final setting time of 70 to 140 minutes. It can not only meet the requirements of rapid setting and hardening, but also ensure sufficient construction time; in addition, the components used in the present invention have little impact on the environment, and therefore have very good application prospects. DETAILED DESCRIPTION

[0022] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0023] All raw materials of the present invention are not particularly limited in their sources and can be purchased from the market or prepared according to conventional methods well known to those skilled in the art.

[0024] There is no particular limitation on the purity of all raw materials in the present invention. The present invention preferably uses analytically pure materials or materials of conventional purity used in the field of grouting materials.

[0025] The invention provides an anti-dynamic water double-liquid synchronous grouting material, which comprises liquid A and liquid B in a volume ratio of (4-6):1. Calculated by weight, the liquid A comprises 18-22 parts of cement, 18-22 parts of fly ash, 35-45 parts of fine sand, 0.3-0.5 parts of a water reducer and 35-45 parts of water; the liquid B comprises 4-7 parts of polyaluminum sulfate, 2-4 parts of aluminum oxide, 2-4 parts of hydroxypropyl methylcellulose, 1-3 parts of calcium hydroxide, 0.3-0.7 parts of triethanolamine, 0.3-0.6 parts of fatty alcohol polyoxyethylene ether, 0.8-1.2 parts of polyacrylamide and 95-105 parts of water.

[0026] The above-mentioned anti-dynamic water dual-liquid synchronous grouting material of the present invention uses traditional cement slurry as liquid A and a polymer solution containing polyacrylamide as liquid B. Polyacrylamide can promote the coagulation of the mixed slurry and greatly improve the water scouring resistance of the grouting material. The present invention also adds fatty alcohol polyoxyethylene ether, which as an emulsifier can prevent the construction inconvenience caused by the excessive coagulation speed of polyacrylamide. In the present invention, hydroxypropyl methylcellulose is a macromolecule, which can improve the overall polymerization of the material, thereby further improving the anti-dynamic water scouring performance and making the material have a higher dynamic water retention rate. In the present invention, polyaluminum sulfate, aluminum oxide and calcium hydroxide can jointly accelerate the mixing progress of liquid A and liquid B and increase the overall construction workability; triethanolamine can improve the coagulation performance of the slurry, and increase the fluidity and filling density.

[0027] The anti-dynamic water two-liquid synchronous grouting material of the present invention not only has good water scouring resistance through the synergistic effect of various components, but also has a retention rate higher than 65% even in a dynamic water environment of 0.8 m / s; it also has a suitable setting time, with an initial setting time of 25 to 50 seconds and a final setting time of 70 to 140 minutes, which can not only meet the requirements of rapid setting and hardening, but also ensure sufficient construction time; in addition, the various components used in the present invention have little impact on the environment, so it is a green anti-dynamic water two-liquid synchronous grouting material with significant economic and environmental benefits.

[0028] In the present invention, the volume ratio of liquid A to liquid B is preferably 5: 1. The volume ratio of the two will affect the coagulation time of the material after the two slurries are mixed.

[0029] In the present invention, the liquid A includes 20 parts of cement, 20 parts of fly ash, 20 parts of fine sand, 0.4 parts of water reducer and 40 parts of water; the liquid B includes 5-7 parts of polyaluminum sulfate, 3 parts of aluminum oxide, 3 parts of hydroxypropyl methylcellulose, 1-2 parts of calcium hydroxide, 0.5 parts of triethanolamine, 0.5 parts of fatty alcohol polyoxyethylene ether, 1 part of polyacrylamide and 100 parts of water.

[0030] The present invention has no particular limitation on the cement. Any cement type and brand familiar to those skilled in the art may be used. Those skilled in the art may select and adjust the cement according to actual application conditions, product requirements, and quality requirements. The cement of the present invention is preferably Portland cement, and its model is preferably P·I type.

[0031] In the present invention, the fly ash is Class F, Grade I, low-calcium fly ash, with a CaO content of less than 10wt% or a free CaO content of no more than 1wt%. High-calcium fly ash contains a large amount of free calcium oxide, which can lead to poor volume stability and other consequences if used improperly. Low-calcium fly ash ensures slurry stability and uniformity. Furthermore, the fly ash has a fineness that satisfies the requirement of a 45μm square mesh sieve residue of no more than 12%.

[0032] The present invention does not impose any particular limitation on the type of fine sand, and fine sand commonly used in the art may be used. The fineness modulus of the fine sand of the present invention is preferably 2.2 to 1.6.

[0033] In the present invention, the water reducer is preferably an ether polycarboxylic acid water reducer, which can improve the fluidity of liquid A and effectively reduce the required amount of cement.

[0034] The present invention also provides a method for preparing the above-mentioned anti-dynamic water dual-liquid synchronous grouting material, comprising the following steps:

[0035] Weigh cement, fly ash, fine sand, water reducer and water in proportion and mix them evenly to obtain Liquid A.

[0036] Weigh polyaluminum sulfate, aluminum oxide, hydroxypropyl methylcellulose, calcium hydroxide, triethanolamine, fatty alcohol polyoxyethylene ether, polyacrylamide and water in proportion and mix well to obtain solution B;

[0037] Before use, mix the liquid A and the liquid B in a volume ratio of (4-6):1 to obtain the product.

[0038] The present invention imposes no particular limitation on the step of uniformly mixing to obtain Liquid A; any mixing method known in the art may be employed. Preferably, the cement, fly ash, and fine sand are first dry-mixed and uniformly mixed, followed by the addition of the aqueous solution of the water reducer and uniform stirring. The present invention imposes no particular limitation on the stirring speed and time in this step; the stirring speed and time only need to be sufficient to ensure uniform mixing of the materials.

[0039] The present invention does not impose any particular limitation on the step of uniformly mixing to obtain Solution B; any mixing method known in the art may be employed. Preferably, the present invention comprises dry-mixing polyaluminum sulfate, aluminum oxide, and calcium hydroxide, and then adding an aqueous solution containing fatty alcohol polyoxyethylene ether, polyacrylamide, and hydroxypropyl methylcellulose, followed by uniform stirring to obtain Solution B. The present invention does not impose any particular limitation on the stirring speed and time in this step; the stirring speed and time only need to ensure uniform stirring of the materials.

[0040] The present invention does not impose any particular limitations on the mixing step of Liquid A and Liquid B; the mixing step commonly used in the art for dual-liquid grouting materials can be employed. Preferably, Liquid A and Liquid B are introduced into a slurry mixing device through two grouting pressurization units and two grouting pipes, and then mixed and injected into the target formation. Grouting of the grouting material of the present invention must be performed immediately after mixing to prevent clogging of the grouting pipes due to slurry coagulation.

[0041] The technical solution of the present invention is further described below with reference to specific embodiments.

[0042] In the following examples, the silicate cement is P·I type, the fly ash is Class F I low-calcium fly ash, the fineness modulus of the fine sand is 2.2 to 1.6, and the water reducer is an ether polycarboxylate water reducer.

[0043] Example 1

[0044] This embodiment provides an anti-dynamic water two-liquid synchronous grouting material, which is composed of liquid A and liquid B. Calculated by weight, liquid A: 20 parts of silicate cement, 20 parts of fly ash, 40 parts of fine sand, 0.4 parts of water reducer, and 40 parts of water; liquid B: 5 parts of polyaluminum sulfate, 3 parts of aluminum oxide, 3 parts of hydroxypropyl methylcellulose, 2 parts of calcium hydroxide, 0.5 parts of triethanolamine, 0.5 parts of fatty alcohol polyoxyethylene ether, 1 part of polyacrylamide, and 100 parts of water.

[0045] Weigh cement, fly ash, fine sand, water reducer and water in proportion. First, dry-mix the cement, fly ash and fine sand until evenly mixed. Then, add the water reducer solution and stir evenly to obtain Liquid A.

[0046] Weigh polyaluminum sulfate, aluminum oxide, hydroxypropyl methylcellulose, calcium hydroxide, triethanolamine, fatty alcohol polyoxyethylene ether, polyacrylamide and water in proportion. First, dry-mix the polyaluminum sulfate, aluminum oxide and calcium hydroxide until evenly mixed. Then, add the aqueous solution containing fatty alcohol polyoxyethylene ether, polyacrylamide and hydroxypropyl methylcellulose, and stir evenly to obtain Liquid B.

[0047] Mix solution A and solution B at a volume ratio of 5:1.

[0048] Example 2

[0049] Compared with Example 1, the difference between this embodiment and Example 1 is that the composition of liquid B is different. Liquid B in this embodiment is: 7 parts of polyaluminum sulfate, 3 parts of aluminum oxide, 3 parts of hydroxypropyl methylcellulose, 2 parts of calcium hydroxide, 0.5 parts of triethanolamine, 0.5 parts of fatty alcohol polyoxyethylene ether, 1 part of polyacrylamide, and 100 parts of water.

[0050] Example 3

[0051] The difference between this embodiment and Example 1 is that the composition of liquid B is different. Liquid B in this embodiment is: 5 parts of polyaluminum sulfate, 3 parts of aluminum oxide, 3 parts of hydroxypropyl methylcellulose, 1 part of calcium hydroxide, 0.5 parts of triethanolamine, 0.5 parts of fatty alcohol polyoxyethylene ether, 1 part of polyacrylamide, and 100 parts of water.

[0052] Comparative Example 1

[0053] This comparative example differs from Example 1 in that the composition of Solution B is different. This comparative example does not contain polyacrylamide and fatty alcohol polyoxyethylene ether. Solution B in this comparative example is: 5 parts polyaluminum sulfate, 3 parts aluminum oxide, 3 parts hydroxypropyl methylcellulose, 2 parts calcium hydroxide, 0.5 parts triethanolamine, and 100 parts water.

[0054] Comparative Example 2

[0055] This comparative example differs from Example 1 in that the composition of Solution B is different. This comparative example does not contain fatty alcohol polyoxyethylene ether. Solution B in this comparative example is: 5 parts of polyaluminum sulfate, 3 parts of aluminum oxide, 3 parts of hydroxypropyl methylcellulose, 2 parts of calcium hydroxide, 0.5 parts of triethanolamine, 1 part of polyacrylamide, and 100 parts of water.

[0056] Comparative Example 3

[0057] This comparative example differs from Example 1 in that the composition of Solution B is different, and this comparative example does not contain hydroxypropyl methylcellulose. Solution B in this comparative example is: 5 parts of polyaluminum sulfate, 3 parts of aluminum oxide, 2 parts of calcium hydroxide, 0.5 parts of triethanolamine, 0.5 parts of fatty alcohol polyoxyethylene ether, 1 part of polyacrylamide, and 100 parts of water.

[0058] The setting time and dynamic water retention rate at different flow rates (0.4 m / s and 0.8 m / s) of Examples 1 to 3 and Comparative Examples 1 to 3 were measured. The results are shown in Table 1.

[0059] Table 1 Setting time and dynamic water retention rate of double liquid grouting materials of Examples 1 to 3 and Comparative Examples 1 to 3

[0060]

[0061] The proportions of Example 1, Example 2, and Example 3 have suitable setting times and high dynamic water retention rates. By comparing Example 1 with Comparative Examples 1 and 2, it can be seen that polyacrylamide has a significant effect on the setting time and dynamic water retention rate; while fatty alcohol polyoxyethylene ether will affect the setting time. When the fatty alcohol polyoxyethylene ether suspending agent is not added, it causes premature setting, which is not conducive to on-site construction. From the comparison of Example 1 and Comparative Example 3, it can be seen that if hydroxypropyl methylcellulose is not added, the slurry's ability to resist dynamic water scouring is significantly reduced.

[0062] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A water-resistant dual-liquid synchronous grouting material, characterized in that: The invention comprises liquid A and liquid B in a volume ratio of (4-6):

1. Calculated by weight, the liquid A comprises 18-22 parts of cement, 18-22 parts of fly ash, 35-45 parts of fine sand, 0.3-0.5 parts of water reducer and 35-45 parts of water; the liquid B comprises 4-7 parts of polyaluminum sulfate, 2-4 parts of aluminum oxide, 2-4 parts of hydroxypropyl methylcellulose, 1-3 parts of calcium hydroxide, 0.3-0.7 parts of triethanolamine, 0.3-0.6 parts of fatty alcohol polyoxyethylene ether, 0.8-1.2 parts of polyacrylamide and 95-105 parts of water.

2. The anti-dynamic water double-liquid synchronous grouting material according to claim 1, characterized in that: The volume ratio of liquid A to liquid B is 5:

1.

3. The anti-dynamic water double-liquid synchronous grouting material according to claim 1, characterized in that: The liquid A includes 20 parts of cement, 20 parts of fly ash, 20 parts of fine sand, 0.4 parts of water reducing agent and 40 parts of water.

4. The anti-dynamic water double-liquid synchronous grouting material according to claim 1, characterized in that: The B solution includes 5-7 parts of polyaluminum sulfate, 3 parts of aluminum oxide, 3 parts of hydroxypropyl methylcellulose, 1-2 parts of calcium hydroxide, 0.5 parts of triethanolamine, 0.5 parts of fatty alcohol polyoxyethylene ether, 1 part of polyacrylamide and 100 parts of water.

5. The anti-dynamic water double-liquid synchronous grouting material according to claim 1, characterized in that: The cement is Portland cement.

6. The anti-dynamic water dual-liquid synchronous grouting material according to claim 5, characterized in that: The type of the silicate cement is P·I type.

7. The anti-dynamic water double-liquid synchronous grouting material according to claim 1, characterized in that: The fly ash is Class F, Grade I low-calcium fly ash, and its CaO content is less than 10 wt% or its free CaO content is not more than 1 wt%.

8. The anti-dynamic water double-liquid synchronous grouting material according to claim 1, characterized in that: The fineness of the fly ash meets the requirement that the residue on a 45 μm square hole sieve is no more than 12%.

9. The anti-dynamic water dual-liquid synchronous grouting material according to claim 1, characterized in that: The fineness modulus of the fine sand is 2.2-1.6; the water reducer is an ether polycarboxylic acid water reducer.

10. The method for preparing the anti-dynamic water dual-liquid synchronous grouting material according to any one of claims 1 to 9, characterized in that: The steps include: Weigh cement, fly ash, fine sand, water reducer and water in proportion and mix them evenly to obtain Liquid A. Weigh polyaluminum sulfate, aluminum oxide, hydroxypropyl methylcellulose, calcium hydroxide, triethanolamine, fatty alcohol polyoxyethylene ether, polyacrylamide and water in proportion and mix well to obtain solution B; Before use, mix the liquid A and the liquid B in a volume ratio of (4-6):1 to obtain the product.

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