Inorganic grouting material with adjustable curing time and use method thereof

Abstract

The invention relates to the technical field of building engineering materials, in particular to an inorganic grouting material with adjustable curing time and a use method thereof. The inorganic grouting material provided by the invention comprises a main material and an adjusting material, the main material comprises the following components in parts by mass: 50-70 parts of sulphoaluminate cement clinker, 10-20 parts of quartz powder, 10-20 parts of gypsum, 3-5 parts of nano volcanic ash, 0.5-1 part of a water reducing agent and 0.1-1.5 parts of a retarder; the adjusting material comprises a composite coagulant and hydroxypropyl methyl cellulose. Through innovation of a material formula and innovation of a construction process, the problem that the grouting effect is poor due to the fact that a traditional grouting material cannot change the solidification time according to variable underground grouting scenes and requirements is solved; accurate grouting can be achieved under the conditions of different grouting depths, different crushing degrees, different diffusion radiuses, different mixing water temperatures, different coal and rock mass temperatures, different water inflow and the like.

Description

Technical Field

[0001] This invention relates to the field of building materials technology, and in particular to an inorganic grouting material with adjustable curing time and its application method. Background Technology

[0002] Due to the complex and varied mining conditions in coal mines, the characteristics of the surrounding rock in engineering practice are significantly heterogeneous. With changes in geological conditions, the mechanical properties and fracture distribution characteristics of the surrounding rock in some coal mines exhibit strong fluctuations, and the engineering requirements for grouting technology and grouting material properties also change accordingly.

[0003] Depending on the working conditions, such as different grouting depths, different degrees of fragmentation, different diffusion radii, different mixing water temperatures, different coal and rock mass temperatures, different water inflow rates, and different grouting pressures, different grouting materials with different curing times are often required.

[0004] Currently, the curing time, setting strength, and fluidity parameters of each product used in engineering are fixed. This cannot adapt to the varying grouting environment underground, such as the degree of rock fracturing and ambient temperature. Using grouting materials unsuitable for the site conditions generally fails to meet the quality requirements of grouting projects, seriously affecting project progress and construction safety. Therefore, how to provide an inorganic grouting material with adjustable curing time and its application method has become an urgent technical problem to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to provide an inorganic grouting material with adjustable curing time and its application method. The material is divided into a main material and a modifier. The main material has the characteristics of rapid setting, high permeability and high strength. The modifier can adjust the curing time of the main material, so as to realize the flexible adjustment of the characteristics of the grouting material according to different working conditions at the grouting site.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0007] This invention provides an inorganic grouting material with adjustable curing time, comprising a main material and a modifier;

[0008] The main material comprises the following components in parts by weight: 50-70 parts of sulfoaluminate cement clinker, 10-20 parts of quartz powder, 10-20 parts of gypsum, 3-5 parts of nano-volcanic ash, 0.5-1 part of water-reducing agent, and 0.1-1.5 parts of retarder.

[0009] The conditioning agent includes a composite coagulant and hydroxypropyl methylcellulose.

[0010] Optionally, the composite coagulant is composed of lithium sulfate, lithium carbonate and sodium aluminate.

[0011] Optionally, the mass ratio of lithium sulfate, lithium carbonate, and sodium aluminate is 2:1:1.

[0012] Optionally, the mass ratio of the composite coagulant to hydroxypropyl methylcellulose is 20:1.

[0013] Optionally, the mass ratio of the main material to the regulating material is 10 to 100:1.

[0014] Optionally, the water-reducing agent includes a polycarboxylate water-reducing agent.

[0015] Optionally, the retarder includes tartaric acid.

[0016] The present invention also provides a method for using the above-mentioned inorganic grouting material, characterized by comprising the following steps:

[0017] 1) Mix the main ingredients and water to obtain a main ingredient mixture;

[0018] 2) After determining the amount of conditioning material to be added based on the temperature and working conditions of the grouting scenario, add the conditioning material to the main material mixture, and grouting can begin after mixing.

[0019] Optionally, the water-cement ratio of the main material and water is 0.4.

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

[0021] This invention provides a fast-setting inorganic grouting material suitable for grouting construction. Through innovation in material formulation and construction process, it solves the problem of poor grouting effect caused by the inability of traditional grouting materials to adjust setting time according to the varying grouting scenarios and needs underground. It achieves precise grouting under conditions such as different grouting depths, different degrees of fragmentation, different diffusion radii, different mixing water temperatures, different coal and rock mass temperatures, and different water inflow rates. It is particularly suitable for engineering scenarios requiring rapid consolidation, such as tunnel support and foundation reinforcement. Detailed Implementation

[0022] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0023] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Every smaller range between any stated value or intermediate value within a stated range, and any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0024] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. All references to this specification are incorporated by way of citation to disclose and describe methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.

[0025] Various modifications and variations can be made to the specific embodiments described in this specification without departing from the scope or spirit of the invention, as will be apparent to those skilled in the art. Other embodiments derived from this specification will also be obvious to those skilled in the art. This application specification and embodiments are merely exemplary.

[0026] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0027] All raw materials used in this invention can be obtained commercially or prepared using existing technologies.

[0028] This invention provides an inorganic grouting material with adjustable curing time, comprising a main material and a modifier;

[0029] The main material comprises the following components in parts by weight: 50-70 parts of sulfoaluminate cement clinker, 10-20 parts of quartz powder, 10-20 parts of gypsum, 3-5 parts of nano-volcanic ash, 0.5-1 part of water-reducing agent, and 0.1-1.5 parts of retarder.

[0030] The conditioning agent includes a composite coagulant and hydroxypropyl methylcellulose.

[0031] In this invention, the main material includes 50-70 parts of sulfoaluminate cement clinker, preferably 55-65 parts, and more preferably 58-60 parts.

[0032] In this invention, the main material includes 10 to 20 parts of quartz powder, preferably 12 to 18 parts, more preferably 14 to 17 parts, and even more preferably 15 to 16 parts.

[0033] In this invention, the main material includes 10 to 20 parts of gypsum, preferably 12 to 18 parts, more preferably 13 to 17 parts, and even more preferably 14 to 16 parts.

[0034] In this invention, the main material includes 3 to 5 parts of nano volcanic ash, preferably 3.5 to 4.5 parts, and more preferably 4 to 4.2 parts.

[0035] In this invention, the main material includes 0.5 to 1 part of water-reducing agent, preferably 0.6 to 0.9 parts, and more preferably 0.7 to 0.8 parts.

[0036] In this invention, the main ingredient includes 0.1 to 1.5 parts of retarder, preferably 0.8 to 1.3 parts, and more preferably 1 to 1.2 parts.

[0037] In this invention, the composite coagulant is composed of lithium sulfate, lithium carbonate and sodium aluminate.

[0038] In this invention, lithium carbonate accelerates cement hydration through lithium ions, shortens the induction period, and promotes the formation of ettringite; lithium sulfate utilizes the synergistic effect of sulfate and lithium ions to stimulate cement activity and accelerate the formation of ettringite; sodium aluminate, through hydrolysis, generates aluminum hydroxide colloid, which disrupts the retarding system, promotes the rapid precipitation of the aluminum phase, and enhances early strength.

[0039] In this invention, the mass ratio of lithium sulfate, lithium carbonate and sodium aluminate is 2:1:1.

[0040] In this invention, the mass ratio of the composite coagulant to hydroxypropyl methylcellulose is 20:1.

[0041] In this invention, the mass ratio of the main material to the regulating material is 10 to 100:1, for example, it can be 10:1, 20:1, 25:1, 33:1, 50:1, 60:1, 70:1, 80:1, 100:1, etc.

[0042] In this invention, for every 2% of the mass of the main ingredient added to the main ingredient, the initial setting time of the main ingredient is reduced by about 5 minutes.

[0043] In this invention, the water-reducing agent includes a polycarboxylate water-reducing agent.

[0044] In this invention, the retarder includes tartaric acid.

[0045] The present invention also provides a method for using the above-mentioned inorganic grouting material, characterized by comprising the following steps:

[0046] 1) Mix the main ingredients and water to obtain a main ingredient mixture;

[0047] 2) After determining the amount of conditioning material to be added based on the temperature and working conditions of the grouting scenario, add the conditioning material to the main material mixture, and grouting can begin after mixing.

[0048] In this invention, the water-cement ratio of the main material and water is 0.4.

[0049] In embodiments of the present invention, the grouting scenarios include deep hole grouting, shallow grouting, shallow grouting with mine water temperature below 10°C, water-rich fracture grouting, and shallow grouting with deep mine water temperature above 25°C.

[0050] The technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0051] Example 1

[0052] Mix 66.4 kg of sulfoaluminate cement clinker, 15 kg of quartz powder, 14 kg of gypsum, 4 kg of nano-volcanic ash, 0.5 kg of polycarboxylate superplasticizer and 0.1 kg of tartaric acid to obtain the main material;

[0053] Take 100kg of main material and mix it with water at a water-cement ratio of 0.4. After stirring evenly, perform deep hole grouting.

[0054] Deep holes are characterized by long grouting paths and long grouting fluid flow times. Grouting materials should meet the requirement of maintaining fluidity before the grouting fluid fully diffuses into the pores of the rock mass. According to the test, the initial setting time of the grouting material in Example 1 is 20 minutes, and the compressive strength after 2 hours can reach 10.2 MPa, which can meet the requirements of deep hole grouting.

[0055] Example 2

[0056] Mix 66.4 kg of sulfoaluminate cement clinker, 15 kg of quartz powder, 14 kg of gypsum, 4 kg of nano-volcanic ash, 0.5 kg of polycarboxylate superplasticizer and 0.1 kg of tartaric acid to obtain the main material;

[0057] Mix 1 kg of lithium sulfate, 0.5 kg of lithium carbonate, and 0.5 kg of sodium aluminate, then add 0.1 kg of hydroxypropyl methylcellulose to obtain a conditioning agent;

[0058] Take 100kg of main material and mix it with water at a water-cement ratio of 0.4. Stir well, then add 2kg of conditioning material and stir for 30 seconds before shallow grouting.

[0059] Shallow pores have the characteristics of short grouting path and short flow time of grouting fluid. The grouting material should meet the requirement of solidifying as soon as possible after the grouting fluid diffuses into the pores of the rock mass. According to the test, the initial setting time of the grouting material is 15 minutes, and the compressive strength can reach 14.7 MPa after 2 hours.

[0060] Example 3

[0061] The only difference from Example 2 is that 100 kg of main material is mixed with water at a water-cement ratio of 0.4, stirred evenly, and then 3 kg of conditioning material is added. After stirring for 30 seconds, shallow grouting is carried out in mines with water temperatures below 10°C.

[0062] Shallow layers with mine water temperatures below 10℃ have the characteristic that the low-temperature environment will prolong the setting time of grouting materials. Grouting materials should meet the requirement of rapid setting in low-temperature environments. According to tests, the initial setting time of grouting materials is 15 minutes, and the compressive strength can reach 13.2 MPa after 2 hours.

[0063] Example 4

[0064] The only difference from Example 2 is that 100 kg of main material is mixed with water at a water-cement ratio of 0.4, stirred evenly, and then 4 kg of conditioning material is added. After stirring for 30 seconds, water-rich fissure grouting is performed.

[0065] Water-rich fissure layers have the characteristic that fissure water may dilute the grout, thereby prolonging the grout's setting time and reducing the grouting effect. The grouting material should meet the requirement that the water-rich fissure layer can set quickly. According to the test, the initial setting time of the grouting material is 10 minutes, and the compressive strength can reach 16.5 MPa after 2 hours.

[0066] Example 5

[0067] The only difference from Example 2 is that 100 kg of main material is mixed with water at a water-cement ratio of 0.4, stirred evenly, and then 2 kg of conditioning material is added. After stirring for 30 seconds, shallow grouting is performed in deep mines where the water temperature is higher than 25°C.

[0068] Deep mine water temperatures above 25℃ in shallow layers are characterized by long grouting paths and long grouting fluid flow times. Grouting materials should meet the requirement of maintaining sufficient fluidity before the grouting fluid fully diffuses into the rock pores in a 25℃ environment. Tests show that the initial setting time of the grouting material is 10 minutes, and the compressive strength can reach 15.8 MPa after 2 hours.

[0069] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An inorganic grouting material with adjustable curing time, characterized in that, Includes main ingredients and seasonings; The main material comprises the following components in parts by weight: 50-70 parts of sulfoaluminate cement clinker, 10-20 parts of quartz powder, 10-20 parts of gypsum, 3-5 parts of nano-volcanic ash, 0.5-1 part of water-reducing agent, and 0.1-1.5 parts of retarder. The conditioning agent includes a composite coagulant and hydroxypropyl methylcellulose.

2. The inorganic grouting material according to claim 1, characterized in that, The composite coagulant is composed of lithium sulfate, lithium carbonate and sodium aluminate.

3. The inorganic grouting material according to claim 2, characterized in that, The mass ratio of lithium sulfate, lithium carbonate, and sodium aluminate is 2:2:

1.

4. The inorganic grouting material according to claim 1, characterized in that, The mass ratio of the composite coagulant to hydroxypropyl methylcellulose is 20:

1.

5. The inorganic grouting material according to claim 1, characterized in that, The mass ratio of the main material to the regulating material is 10 to 100:

1.

6. The inorganic grouting material according to claim 1, characterized in that, The water-reducing agent includes polycarboxylate water-reducing agents.

7. The inorganic grouting material according to claim 1, characterized in that, The retarder includes tartaric acid.

8. The method of using the inorganic grouting material according to any one of claims 1 to 7, characterized in that, Includes the following steps: 1) Mix the main ingredients and water to obtain a main ingredient mixture; 2) After determining the amount of conditioning material to be added based on the temperature and working conditions of the grouting scenario, add the conditioning material to the main material mixture, and grouting can begin after mixing.

9. The method of use according to claim 8, characterized in that, The water-cement ratio of the main material and water is 0.4.