CN115974479A - Premixed shield grouting material and preparation method thereof - Google Patents

Premixed shield grouting material and preparation method thereof Download PDF

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Publication number
CN115974479A
CN115974479A CN202211643015.0A CN202211643015A CN115974479A CN 115974479 A CN115974479 A CN 115974479A CN 202211643015 A CN202211643015 A CN 202211643015A CN 115974479 A CN115974479 A CN 115974479A
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China
Prior art keywords
parts
grouting material
ready
shield grouting
cement
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CN202211643015.0A
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Inventor
王丽丽
李双
张程浩
丁永周
丁胜
姜长洋
梁旭
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BCEG Advanced Construction Materials Co Ltd
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BCEG Advanced Construction Materials Co Ltd
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Priority to CN202211643015.0A priority Critical patent/CN115974479A/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Abstract

The invention relates to a ready-mixed shield grouting material and a preparation method thereof. The ready-mixed shield grouting material comprises the following raw materials in parts by weight: 70-80 parts of fly ash, 100-120 parts of ultrafine powder, 120-130 parts of cement, 593-675 parts of stone powder, 15-20 parts of desulfurized gypsum and 0.5-1 part of water reducing agent. The premixed shield grouting material is scientific and reasonable in proportion, does not contain a common accelerator, bentonite, a water reducing agent and lithium carbonate, reduces the cost, and simultaneously, performance indexes such as fluidity, apparent setting time, initial setting time, consolidation rate and compressive strength can still meet standard requirements, so that the market is greatly expanded; the preparation method has simple and reasonable process and easy control of operation, and is beneficial to large-scale output.

Description

Premixed shield grouting material and preparation method thereof
Technical Field
The invention belongs to the field of engineering, and particularly relates to a ready-mixed shield grouting material and a preparation method thereof.
Background
The dry material of the ready-mixed shield grouting material is a dry mixture for shield grouting material engineering, which is prepared by processing dry aggregate, gelled material, filler, additive and the like which are subjected to grading treatment in a professional factory according to a specified proportion. The premixed shield grouting material dry material is generally produced by a dry-mixed mortar plant. After being transported to a construction site in bulk, the slurry is mixed with water in a certain proportion and stirred into uniform slurry, and the slurry is used as a material for shield wall post-grouting alone or together with matched components. The method aims to effectively control the ground settlement, ensure the early stability of the segment lining and form a waterproof first defense line of the lining when the shield is constructed.
The shield synchronous grouting technology is widely applied to the shield construction process at present, and a complete technical system has obvious effects of stabilizing a control tunnel and reducing disturbance to a stratum. The technical system comprises a grouting material, a mixing and transporting system, slurry pumping equipment, a grouting control process and the like, wherein the key point of the technical system is that the shield grouting material with good matching performance is used. The good stability and fluidity of the grouting material and the proper setting time are necessary conditions for ensuring the smooth completion of the shield construction. At present, in the tunnel shield construction process, the grouting material meeting the national standard has high cost, and the cost is reduced and is difficult to reach the national standard.
How to improve each index is an urgent technical problem to be solved on the premise of meeting the national standard and controlling the cost. Therefore, the technical scheme of the invention is provided.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a ready-mixed shield grouting material and a preparation method thereof. The premixed shield grouting material is scientific and reasonable in proportion, does not contain a common accelerator, bentonite, a water reducing agent and lithium carbonate, reduces the cost, and simultaneously, performance indexes such as fluidity, apparent setting time, initial setting time, consolidation rate and compressive strength can still meet standard requirements, so that the market is greatly expanded; the preparation method has simple and reasonable process and easy control of operation, and is beneficial to large-scale output.
The scheme of the invention provides a ready-mixed shield grouting material, which comprises the following raw materials in parts by weight: 70-80 parts of fly ash, 100-120 parts of ultrafine powder, 120-130 parts of cement, 593-675 parts of stone powder, 15-20 parts of desulfurized gypsum and 0.5-1 part of water reducing agent.
Preferably, the ready-mixed shield grouting material comprises the following raw materials in parts by weight: 80 parts of fly ash, 100 parts of ultrafine powder, 130 parts of cement, 674 parts of stone powder, 15 parts of desulfurized gypsum and 1 part of water reducing agent.
Preferably, the cement is portland PO 42.5 grade portland cement.
Preferably, the superfine powder is produced by Tianjin cube corner, and the fineness index of the superfine powder is 2.5 percent of screen residue below 0.045 mm.
Preferably, the particle size of the stone powder is screened to be less than 0.6 mm.
Based on the same technical concept, the invention also provides a preparation method of the ready-mixed shield grouting material, which comprises the following steps:
(1) Stirring the fly ash, the cement and the desulfurized gypsum, and uniformly mixing to obtain a first mixture;
(2) Stirring the first mixture with the ultrafine powder and the stone powder, and uniformly mixing to obtain a second mixture;
(3) And stirring the second mixture and water, and uniformly mixing to obtain the ready-mixed shield grouting material.
Preferably, in the step (1), the stirring speed is 40-60 r/min, and the stirring time is 30-40 min.
Preferably, in the step (2), the stirring speed is 80-90 r/min, and the stirring time is 40-60 min.
Preferably, in the step (3), the stirring speed is 30-50 r/min, and the stirring time is 60-80 min; the weight ratio of the second mixed material to the water is 2:1.
The invention has the beneficial effects that:
1. the premixed shield grouting material provided by the invention is scientific and reasonable in proportioning, does not contain common accelerator, bentonite, water reducer and lithium carbonate, reduces the cost, and simultaneously, the performance indexes such as fluidity, apparent setting time, initial setting time, consolidation rate and compressive strength can still meet the standard requirements, thereby greatly expanding the market.
2. The preparation method disclosed by the invention is simple and reasonable in process, easy to control in operation and beneficial to large-scale output.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Example 1
The embodiment provides a preparation method of a ready-mixed shield grouting material, which comprises the following steps:
(1) Mixing the fly ash, the cement and the desulfurized gypsum, stirring for 30min under the condition of 40r/min, and uniformly mixing to obtain a first mixture;
(2) Mixing the first mixture with the ultrafine powder and the stone powder, stirring for 40min under the condition of 80r/min, and uniformly mixing to obtain a second mixture;
(3) And mixing the second mixture with water, stirring for 60min under the condition of 30r/min, and uniformly mixing to obtain the ready-mixed shield grouting material.
In this example, the amounts of the raw materials used are shown in table 1.
TABLE 1 raw material amounts
Raw materials Amount of the composition
Fly ash 80kg
Superfine powder 100kg
Cement 130kg
Stone powder 674kg
Desulfurized gypsum 15kg
Water reducing agent 1kg
Water (W) 500kg
Example 2
The embodiment provides a preparation method of a ready-mixed shield grouting material, which comprises the following steps:
(1) Mixing the fly ash, the cement and the desulfurized gypsum, stirring for 40min under the condition of 60r/min, and uniformly mixing to obtain a first mixture;
(2) Mixing the first mixture with the ultrafine powder and the stone powder, stirring for 60min under the condition of 90r/min, and uniformly mixing to obtain a second mixture;
(3) And mixing the second mixture with water, stirring for 80min under the condition of 50r/min, and uniformly mixing to obtain the ready-mixed shield grouting material.
In this example, the amounts of the raw materials used are shown in table 2.
TABLE 2 raw material amounts
Figure BDA0004008418360000041
Figure BDA0004008418360000051
Example 3
The embodiment provides a preparation method of a ready-mixed shield grouting material, which comprises the following steps:
(1) Mixing the fly ash, the cement and the desulfurized gypsum, stirring for 35min under the condition of 50r/min, and uniformly mixing to obtain a first mixture;
(2) Mixing the first mixture with the ultrafine powder and the stone powder, stirring for 50min under the condition of 85r/min, and uniformly mixing to obtain a second mixture;
(3) And mixing the second mixture with water, stirring for 70min under the condition of 40r/min, and uniformly mixing to obtain the ready-mixed shield grouting material.
In this example, the amounts of the raw materials used are shown in Table 3.
TABLE 3 raw material amounts
Figure BDA0004008418360000052
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Figure BDA0004008418360000061
The selection of the raw materials and the corresponding dosage of the invention is scientifically verified, and the specific design idea is as follows:
in the actual construction process, in order to meet the construction process and specific construction requirements under the complex environment condition of shield synchronous grouting, the slurry after the premixed shield grouting material is mixed must meet the following requirements:
(1) The shield tail gap can be fully filled with the excellent filling performance;
(2) The pump has good workability and less segregation, and can pump for a long distance;
(3) The appropriate setting time can not block the grouting pipe too fast or too slow, otherwise, the pipe piece is deviated in the tunnel;
(4) The strength meets the engineering design index;
(5) The slurry has high solidification rate and less bleeding;
(6) The consistency is proper, and the stability is high;
(7) Environmental protection, no pollution and low price.
Based on the requirements, the technical performance requirements of the ready-mixed shield grouting material are shown in the table 4.
TABLE 4 technical Property requirements for shield grouting
Figure BDA0004008418360000062
Figure BDA0004008418360000071
The present invention takes example 1 as an experimental example, and designs comparative formulations 1 to 3, as shown in table 5.
TABLE 5 COMPARATIVE EXAMPLES 1-3
Comparative formulation 1 Comparative formulation 2 Comparative formulation 3 Examples of the experiments
Cement/kg 130 130 130 130
Fly ash/kg 80 80 80 80
Ultrafine powder/kg 100 100 100 100
Stone powder/kg 607 609 679 674
Desulfurized gypsum/kg 0 0 0 15
Setting accelerator/kg 10 10 10 0
Bentonite/kg 70 70 0 0
Water reducing agent/kg 1 1 1 1
Lithium carbonate/kg 2 0 0 0
Fluidity(s) 70 70 70 70
Apparent setting time (h) 1.5 2.5 2.5 2
Initial setting time (h) 15.5 21 20.5 15
Consolidation Rate (%) 99 98 93 96
Compressive strength (MPa) 3.5 3.0 2.5 3.0
The performance of the comparative formula 1 can meet the index, but the formula has too many types and the cost is too high; the initial setting time of the comparative formula 2 is unqualified; comparative formulation 3 failed in initial set time and consolidation rate. It is emphasized that the components of the experimental examples do not contain the usual setting accelerators, bentonite and lithium carbonate, the cost is reduced and the properties are still satisfactory compared to comparative formulation 1.
It should be noted that lithium carbonate is one of the raw materials in the conventional ready-mixed shield grouting material, although the addition amount is small, the cost is high, and the low-cost desulfurized gypsum can be adopted to replace the lithium carbonate through repeated verification of the inventor. The desulfurized gypsum can promote the hydration of tricalcium silicate and dicalcium silicate minerals in the cement, thereby improving the early strength of the cement and balancing the strength of the cement at all ages. The desulfurized gypsum contains part of unreacted CaCO 3 And partially soluble K, na salts, the existence of the impurities can promote the hydration of cement and stimulate the full play of the activity of a cement admixture or a concrete admixture. After a small amount of desulfurized gypsum is added, the desulfurized gypsum reacts with hydrated calcium aluminate to generate ettringite which is insoluble in water and precipitates in cement particles to prevent tricalcium aluminate from further hydrating, so that the coagulation of cement is delayed. However, if the amount of gypsum is too large, the setting of cement is accelerated. At the same time, the cement paste may be expanded at a later stage to cause cracking and destruction. Repeated researches of the inventor find that the activity of the early-stage volcanic ash of the fly ash is obviously improved under the action of the composite excitant; the desulfurized gypsum is a sulfate excitant with ideal activity of the fly ash and the volcanic ash besides self-crystallization and certain enhancement effect. The 3d of the fly ash starts to be obviously hydrated, and the desulfurized gypsum excites the hydration activity of the fly ashTherefore, the research on the addition amount of the desulfurized gypsum is necessary from the aspects of both performance and cost. The influence of desulfurization gypsum with different mixing amounts on the performances of the shield grouting material is researched, and the gypsum mixing range is determined, so that comparative formulas 4-7 are further designed, and are specifically shown in table 6.
TABLE 6 comparative formulations 4 to 7
Figure BDA0004008418360000081
/>
Figure BDA0004008418360000091
Table 6 mainly studies the optimum amount of desulfurized gypsum, and it can be seen from Table 6 that the initial setting time and the consolidation rate of comparative formula 4 and comparative formula 5 do not meet the standards; the consolidation rate for comparative formulation 7 did not meet the standard; both the experimental examples and the comparative formula 6 meet the standard, so the optimum amount of desulfurized gypsum is 15-20 kg, which accounts for 1.5-2.0 wt.%. The result also shows that the proper gypsum mixing amount can reduce the bleeding rate of the shield grouting material, improve the consolidation rate and the compressive strength, promote the coagulation of the slurry and shorten the coagulation time. The experimental examples can meet various performance indexes and have the lowest cost, and compared with the comparative formula 1, the cost per ton of the experimental examples can be reduced by about 200 yuan.
In order to show the performance of the ready-mixed shield grouting material, the product (in a dry powder state) prepared by the method in example 2 is tested, and passes the inspection of the quality supervision and inspection test center of the building envelope material and pipeline product in the national building material industry, and the specific result is shown in table 7.
TABLE 7 test results
Figure BDA0004008418360000092
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Figure BDA0004008418360000101
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. The ready-mixed shield grouting material is characterized by comprising the following raw materials in parts by weight: 70-80 parts of fly ash, 100-120 parts of ultrafine powder, 120-130 parts of cement, 593-675 parts of stone powder, 15-20 parts of desulfurized gypsum and 0.5-1 part of water reducing agent.
2. The ready-mixed shield grouting material of claim 1, which is characterized by comprising the following raw materials in parts by weight: 80 parts of fly ash, 100 parts of ultrafine powder, 130 parts of cement, 674 parts of stone powder, 15 parts of desulfurized gypsum and 1 part of water reducing agent.
3. The ready mix shield grouting material of claim 1 or 2, wherein the cement is 42.5 grade portland cement.
4. The ready-mixed shield grouting material according to claim 1 or 2, wherein the fineness index of the ultrafine powder is 2.5% of the oversize below 0.045 mm.
5. The ready-mixed shield grouting material according to claim 1 or 2, wherein the particle size of the stone powder is selected to be 0.6mm or less.
6. The method for preparing the ready-mixed shield grouting material of any one of claims 1 to 5, characterized by comprising the following steps:
(1) Stirring the fly ash, the cement and the desulfurized gypsum, and uniformly mixing to obtain a first mixture;
(2) Stirring the first mixture with the ultrafine powder and the stone powder, and uniformly mixing to obtain a second mixture;
(3) And stirring the second mixture and water, and uniformly mixing to obtain the ready-mixed shield grouting material.
7. The preparation method of the ready-mixed shield grouting material according to claim 6, wherein in the step (1), the stirring speed is 40-60 r/min, and the stirring time is 30-40 min.
8. The preparation method of the ready-mixed shield grouting material according to claim 6, wherein in the step (2), the stirring speed is 80-90 r/min, and the stirring time is 40-60 min.
9. The preparation method of the ready-mixed shield grouting material according to claim 6, wherein the stirring speed in the step (3) is 30-50 r/min, and the stirring time is 60-80 min.
10. The method for preparing the ready-mixed shield grouting material according to claim 6, wherein the weight ratio of the second mixture to water in the step (3) is 2:1.
CN202211643015.0A 2022-12-20 2022-12-20 Premixed shield grouting material and preparation method thereof Pending CN115974479A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101851082A (en) * 2010-05-20 2010-10-06 同济大学 Single liquid type hardenable slurry for backfill grouting in tunnel shield construction
CN102173699A (en) * 2010-12-21 2011-09-07 上海隧道工程股份有限公司 Synchronous grouting slurry for shield tunneling and preparation method thereof
CN115029113A (en) * 2022-05-09 2022-09-09 北京建筑材料科学研究总院有限公司 Premixed shield grouting material, shield grouting slurry and application thereof
CN115304333A (en) * 2022-08-29 2022-11-08 北京金隅砂浆有限公司 Shield synchronous grouting material and preparation method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101851082A (en) * 2010-05-20 2010-10-06 同济大学 Single liquid type hardenable slurry for backfill grouting in tunnel shield construction
CN102173699A (en) * 2010-12-21 2011-09-07 上海隧道工程股份有限公司 Synchronous grouting slurry for shield tunneling and preparation method thereof
CN115029113A (en) * 2022-05-09 2022-09-09 北京建筑材料科学研究总院有限公司 Premixed shield grouting material, shield grouting slurry and application thereof
CN115304333A (en) * 2022-08-29 2022-11-08 北京金隅砂浆有限公司 Shield synchronous grouting material and preparation method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
王丽丽等: ""预拌盾构同步注浆料配合比设计及性能研究"", 《建筑技术》, vol. 52, no. 9, pages 1135 - 1138 *

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