CN115784696A - Dry powder composition for shield grouting material, air-transportable dry powder for shield grouting material, and preparation method and use method thereof - Google Patents
Dry powder composition for shield grouting material, air-transportable dry powder for shield grouting material, and preparation method and use method thereof Download PDFInfo
- Publication number
- CN115784696A CN115784696A CN202211441639.4A CN202211441639A CN115784696A CN 115784696 A CN115784696 A CN 115784696A CN 202211441639 A CN202211441639 A CN 202211441639A CN 115784696 A CN115784696 A CN 115784696A
- Authority
- CN
- China
- Prior art keywords
- dry powder
- grouting material
- sand
- shield grouting
- powder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to the technical field of building materials, and discloses a dry powder composition of shield grouting material, dry powder of air-transportable shield grouting material, a preparation method and a use method thereof. The composition contains the following components which are stored independently or in a mixed manner: cement clinker, fluorgypsum, slag, steel slag, modified bentonite, sand powder combination and an excitant. The shield grouting material provided by the invention has good fluidity, strong anti-delamination bleeding capacity and high consolidation rate; the shield grouting material prepared by the method can absorb a large amount of solid waste, reduce the using amount of cement and has remarkable environmental benefit; in addition, the construction site can adopt a pneumatic dry powder conveying mode to replace a long-distance liquid conveying mode, the risk of slurry pressure bleeding is obviously reduced, the engineering quality is ensured, the length of a cleaning pipeline is reduced, and the water-saving effect is achieved.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a dry powder composition of shield grouting material, dry powder of air-transportable shield grouting material, a preparation method and a use method thereof.
Background
In recent years, the steel production in China is always operated at a high level, the steel slag production is greatly increased, about 1.20 hundred million tons of steel slag are produced in China in 2020, and the accumulated stockpiling amount exceeds 10 hundred million tons. The utilization rate of the steel slag is low due to large fluctuation of components and phase compositions, low activity, poor grindability, poor stability and the like. A large amount of steel slag is piled up, so that land resources are occupied, and great potential safety hazards are brought to the ecological environment.
When the shield is constructed, an annular gap of 100-140 mm is formed between an excavation surface and a lining segment, and the gap needs to be grouted for solving the stability problems of surface subsidence, segment offset and the like. The shield grouting material is applied to shield construction and mainly plays a role in filling excavation gaps and stabilizing duct pieces.
In the concrete project, the shield grouting material has the following characteristics:
(1) The existing synchronous grouting material mainly takes ordinary portland cement and fly ash as main cementing materials, natural river sand as aggregate, and meanwhile, the usage amount of single engineering of shield construction is large, the shield construction length is long no matter subway shield excavation or water delivery tunnel of hydraulic engineering, so the demand amount for grouting material is large, and a large amount of cement and natural river sand are consumed;
(2) On the construction site, the distance between the slurry mixing machine and the grouting point is far, wet slurry is conveyed to the grouting point through a long-distance pump pipe, slurry segregation, bleeding and even pipe blockage easily occur, and the cleaning is complicated and the water consumption is large after the construction is finished.
On the basis, on the premise of ensuring the product qualification and the engineering quality, in order to reduce the cement consumption in the shield grouting material and realize the low carbonization of the product, solid wastes such as steel slag, slag and the like are adopted, and meanwhile, the construction method is improved, so that the pumping distance of wet slurry is reduced, the stability and the uniformity of the slurry are ensured, and the pipe blockage is avoided.
CN114230270A discloses a shield synchronous grouting material and a preparation method thereof, wherein the shield synchronous grouting material comprises the following components in parts by mass: cement: 4-180 parts; mineral admixture: 12-255 parts; polishing slag: 40 to 180 portions; fine aggregate: 100-300 parts; additive: 0 to 0.6 portion; water: 0 to 292 parts, and the preparation method comprises the following steps: and uniformly mixing the cement, the mineral admixture, the polishing slag, the fine aggregate, the additive and the water to obtain the shield synchronous grouting material. The method adopts the polishing slag to prepare the shield grouting material, can consume a certain amount of solid waste, and reduces the consumption of sand and the product cost.
However, the above method still has the following problems: (1) The polishing slag contains 20-60% of water, so the shield grouting material cannot realize pre-dry mixing in a product factory and can only be prepared on a construction site, which causes difficult quality control and large slurry performance fluctuation; (2) The polishing slag contains 5-15% of organic matters, and the organic matters are dissolved into water and soil to cause pollution.
CN113716922A discloses a composition of shield synchronous grouting material: 12% of special cement, 26% of metallurgical slag micro powder, 45% of tailing sand, 1.6% of rheological stabilizer, 0.4% of suspension dispersant, 0.5.5% of water-retention plasticizer, 0.8.6% of water reducer, 0.04.09% of defoaming agent and 3% of reinforcing component.
Although the method uses the metallurgical slag micro powder and the tailing sand, the solid wastes are consumed, but special cement such as sulphoaluminate cement or high-alumina cement is needed, and the dosage is not less, so that the cost of the grouting material is higher, the economic benefit is influenced, and the popularization and the implementation are difficult.
Therefore, on the premise of ensuring the quality stability of the shield grouting material, the application of solid waste in the shield grouting material is reasonably realized, the shield grouting material which is convenient for pneumatic transportation and does not separate bleeding is obtained, and the shield grouting material has important significance for building material enterprises.
Disclosure of Invention
The invention provides a shield grouting material convenient for pneumatic transportation, and aims to overcome the defects that the shield grouting material in the prior art is easy to separate and has high bleeding rate.
In order to achieve the above object, a first aspect of the present invention provides a dry powder composition of shield grouting material, which comprises the following components stored independently or in a mixture of two or more of them:
cement clinker, fluorgypsum, slag, steel slag, modified bentonite, sand powder combination and an excitant;
the content of the cement clinker is 3-5wt%, the content of the fluorgypsum is 5-10 wt%, the content of the slag is 15-25 wt%, the content of the steel slag is 15-30 wt%, the content of the modified bentonite is 1-2 wt%, the content of the sand powder combination is 40-60 wt%, and the content of the exciting agent is 0.2-0.6 wt% based on the total weight of the composition;
the sand powder combination contains fine sand with the average particle size of 0.075mm-1.18mm and fine powder with the average particle size of not more than 0.075mm, and the weight ratio of the fine sand to the fine powder is 1:1.2-2;
the modified bentonite is prepared by performing sodium treatment and intercalation modification on calcium bentonite, and the specific surface area of the modified bentonite is not less than 300m 2 /kg。
In a second aspect, the invention provides a method for preparing a dry powder of an air-transportable shield grouting material, comprising: first mixing the components of the composition of the first aspect.
In a third aspect, the invention provides a dry powder of the gassable shield grouting material prepared by the method of the second aspect.
In a fourth aspect, the present invention provides a method of using the pneumatically conveyable shield grouting dry powder of the third aspect, the method comprising: conveying the gassable shield grouting material dry powder to a material point for pulping by a gassable method, and mixing the gassable shield grouting material dry powder with water for the second time, wherein the mass ratio of the gassable shield grouting material dry powder to the water is 100: (40-50).
According to the invention, solid wastes such as steel slag, slag and fluorgypsum are compounded with cement clinker, modified bentonite, an activator and sand powder in a specific ratio, so that on one hand, a large amount of solid wastes can be reasonably utilized, the consumption of resources such as cement is reduced, the product cost is reduced, and the self low-carbon development is realized; on the other hand, the pneumatic transportation of the dry powder of the shield grouting material can be realized without segregation, and the quality stability of the grouting material is ensured.
Particularly, the shield grouting material dry powder composition provided by the invention can be used for obtaining the shield grouting material which has good stability, is not easy to separate and has low bleeding rate.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
As described above, the first aspect of the present invention provides a dry powder composition of shield grouting material, which contains the following components stored independently or in a mixture of two or more of them:
cement clinker, fluorgypsum, slag, steel slag, modified bentonite, sand powder combination and an excitant;
the content of the cement clinker is 3-5wt%, the content of the fluorgypsum is 5-10 wt%, the content of the slag is 15-25 wt%, the content of the steel slag is 15-30 wt%, the content of the modified bentonite is 1-2 wt%, the content of the sand powder combination is 40-60 wt%, and the content of the exciting agent is 0.2-0.6 wt% based on the total weight of the composition;
the sand powder combination contains fine sand with the average particle size of 0.075mm-1.18mm and fine powder with the average particle size of not more than 0.075mm, and the weight ratio of the fine sand to the fine powder is 1:1.2-2;
the modified bentonite is prepared by performing sodium modification and intercalation modification on calcium bentonite, and the specific surface area of the modified bentonite is not less than 300m 2 /kg。
In the invention, the chemical compositions of the steel slag and the slag are similar to those of portland cement clinker, and the steel slag and the slag have potential hydration activity, and particularly have higher hydration activity after being ground into specific particle size, so that the inventor finds that the steel slag and the slag can quickly generate hydration reaction under the excitation of the cement clinker and the fluorgypsum in the research process to form a hardened body with strength; the inventor also finds that the hydration reaction of the system is accelerated under the action of an excitant such as calcined alum, anhydrous sodium sulphate, aluminum sulfate and the like.
According to the invention, sodium modification and function strengthening of calcium bentonite are synchronously performed, and polyacrylamide and guar gum are embedded into interlayer gaps of the bentonite by adopting an innovative modification treatment mode, so that the suspension and anti-settling properties of the bentonite can be greatly improved, and the pressure bleeding resistance and slurry stability of slurry injection slurry are greatly improved.
In the invention, the machine-made sand powder is used as a product with excessive yield in a machine-made sand production line or a ready-mixed mortar production line, the construction site lacks an application scene of using a large amount of the sand powder, and a mortar enterprise lacks a mortar product capable of consuming a large amount of the sand powder, so that the condition of 'bin explosion' of the sand powder is frequently caused. The composition provided by the invention can consume a large amount of stone powder, and reduces the use of fine aggregates with large difference of stacking densities, thereby endowing the shield grouting material with the characteristic of pneumatic conveying without segregation.
Preferably, the weight ratio of the fine sand to the fine powder is 1:1.3-1.9. The inventor finds that by adopting the specific implementation mode under the preferable condition, a large amount of machine-made sand auxiliary stone powder can be consumed, the content of coarse sand in the composition can be reduced, and the dry powder is prevented from blocking a pipe, so that the shield grouting material dry powder has more excellent air conveying performance.
According to a particularly preferred embodiment of the present invention, the fine sand is selected from at least one of machine-made sand, river sand, and quartz sand.
According to a particularly preferred embodiment of the invention, the fine powder is a machine-made quartz sand or a machine-made limestone sand by-product.
Preferably, the modified bentonite is prepared by a method comprising the following steps: the method comprises the steps of carrying out contact mixing I on calcium bentonite and a sodium carbonate solution to obtain a mixed solution I, and carrying out contact reaction I on the mixed solution I, polyacrylamide and guar gum.
In the research process, the inventor finds that the modified bentonite prepared by the method can be introduced into a dry powder composition of shield grouting material, so that the pressure bleeding resistance and the slurry stability of the grouting material slurry can be remarkably improved.
Preferably, the conditions for contacting mix I include at least: the stirring speed is 50-150rpm, the temperature is 10-40 ℃, and the time is 48-72h.
Preferably, the conditions of the contact reaction I include at least: the temperature is 10-40 ℃ and the time is 48-72h.
Preferably, the concentration of the sodium carbonate solution is 3-5wt%.
Preferably, the dosage of the polyacrylamide is 0.5-2g and the dosage of the guar gum is 0.1-1g relative to 100g of the calcium bentonite.
Preferably, the cement clinker is a portland cement clinker having an average particle size of not more than 35 μm.
Preferably, the specific surface area of the cement clinker is not less than 400m 2 /kg。
Preferably, the content of calcium sulfate in the fluorgypsum is not less than 85wt%, and the specific surface area of the fluorgypsum is not less than 300m 2 /kg。
Preferably, the slag is slag powder having an average particle diameter of not more than 25 μm and a specific surface area of not less than 400m 2 /kg。
Preferably, the steel slag is steel slag powder with the average particle size of not more than 20 μm, and the specific surface area of the steel slag is not less than 450m 2 /kg。
It should be noted that the fluorgypsum, the slag and the steel slag are all solid wastes, and the obtaining manner of the fluorgypsum, the slag and the steel slag is very easy, for example, the fluorgypsum can be a by-product of a hydrogen fluoride production enterprise, the slag is a by-product obtained by discharging slag in an iron making process of a steel enterprise into water and cooling the slag, and the steel slag is a solid waste discharged in a steel making process of the steel enterprise; in addition, the sources of the fluorgypsum, the slag and the steel slag are not particularly required, and the requirement of the invention can be met.
According to the invention, a large amount of byproducts generated by steel enterprises, such as steel slag, slag and other solid wastes, are compounded with the cement clinker with similar chemical composition, so that on one hand, a large amount of solid wastes can be consumed, and on the other hand, the components can rapidly generate hydration reaction under the double excitation action of the fluorgypsum and the exciting agent to form a hardened body with strength, and the gassable shield grouting material dry powder with excellent mechanical properties is obtained.
According to a particularly preferred embodiment of the invention, the exciting agent is selected from at least one of alum, anhydrous sodium sulphate and aluminium sulphate.
As previously noted, a second aspect of the present invention provides a method of preparing a dry powder of an air-transportable shield grouting material, the method comprising: first mixing the components of the composition according to the first aspect.
Preferably, the conditions of the first mixing include at least: stirring speed of 200-400rpm at 0-40 deg.C for 3-5min.
As previously mentioned, a third aspect of the present invention provides the pneumatically transportable shield grouting dry powder produced by the method of the second aspect.
In accordance with a fourth aspect of the present invention, there is provided a method of using the pneumatically conveyable shield grouting dry powder of the third aspect, the method comprising: conveying the gassable shield grouting material dry powder to a material point for pulping by a gassable method, and mixing the gassable shield grouting material dry powder with water for the second time, wherein the mass ratio of the gassable shield grouting material dry powder to the water is 100: (40-50).
Preferably, the conditions of the second mixing include at least: stirring speed is 100-300rpm, temperature is 5-35 deg.C, and time is 2-4min.
It should be noted that, in the actual use process, according to the characteristic that the dry powder of the shield grouting material can be delivered by air, the dry powder of the shield grouting material is firstly blown into the mortar moving silo, then the air delivery transportation mode is adopted, for example, the dry powder of the shield grouting material is delivered to a material point for pulping by an air delivery system of the mortar, and finally the dry powder of the shield grouting material is stirred and mixed with water and then pumped into a grouting port to complete the construction.
The invention has no special requirements on the type of the mortar air conveying system, can adopt the mortar air conveying system known in the field, and only needs to convey the dry powder of the shield grouting material to a material preparing point, and the invention is not described in detail herein, and the person skilled in the art should not be understood as the limitation of the invention.
Compared with the prior art, the invention also has the following beneficial effects:
(1) The grouting material dry powder adopts a large amount of solid wastes such as steel slag, fluorgypsum and the like, reduces the use of resources such as cement and the like, reduces the product cost and realizes the self low-carbon development.
(2) The low-carbon grouting material dry powder adopts a large amount of powder materials, including waste residues and byproduct stone powder of a machine-made sand production line, reduces the use of fine aggregates and the density difference of various raw materials of the dry powder, further realizes pneumatic transportation of the grouting material dry powder without segregation phenomenon, and ensures that the grouting material quality does not fluctuate.
(3) After the air-transportable low-carbon grouting material dry powder is stirred with water in proportion, the flowability is good, the outflow time is 40-50 s, and the permeability is strong; because the special modified bentonite is used, the slurry has good stability, no segregation and bleeding and high consolidation rate, and the consolidation rate is more than or equal to 97 percent; because of multiple excitation effects on the steel slag and the slag, the grouting material has fast strength development, the 14d strength can exceed the 28d strength required by the material standard, and the 14d compressive strength is more than or equal to 3.5MPa, thereby meeting the requirement of synchronous grouting in shield construction.
The present invention will be described in detail below by way of examples. In the following examples, various raw materials used are commercially available ones unless otherwise specified.
Cement clinker: s400 Cement clinker powder, conch brand, average grain diameter of 35 μm, specific surface area of 410m 2 Per kg, from whelk (bimodal) cement;
fluorine gypsum: the content of calcium sulfate was 88wt%, and the specific surface area was 320m 2 (ii)/kg, available from Chenzhou fluorine chemistry, inc., color, hunan;
slag: the average grain diameter is 25 mu m, and S95 mineral powder is purchased from Sanhong building materials Co., ltd, hunan;
steel slag: the average particle size is 20 μm, and the product is purchased from Wuhanwu new building materials GmbH;
the modified bentonite is prepared by the method comprising the following steps:
contacting and mixing I (stirring speed is 100rpm, temperature is 20 ℃ and time is 72 h) of 100g of calcium bentonite and 300mL of sodium carbonate solution with concentration of 4wt% to obtain mixed solution I, carrying out contact reaction I (temperature is 20 ℃ and time is 72 h) on the mixed solution I, 1g of polyacrylamide and 0.5g of guar gum, then extruding by using a pair roller machine with extrusion interval of 1mm, and sequentially drying (temperature is 40 ℃ and time is 72 h) and crushing the extruded material to obtain the material with specific surface area of 300m 2 Per kg of modified bentonite;
calcium bentonite: purchased from austin mining ltd, north river;
polyacrylamide: the trade mark is XA-30, and is purchased from Henan Senso environmental protection science and technology Limited;
guar gum: the brand is JK-703L, and is purchased from Kyokun oilfield chemical technology Co., ltd;
sodium bentonite: purchased from Zhejiang yu hong new materials, ltd;
excitant-1: calcined alum purchased from Hengyang Jian Heng industry Co., ltd;
excitant-2: the mass ratio is 1:2 calcined alum and anhydrous sodium sulfate; wherein the anhydrous sodium sulphate has an average particle size of 0.30mm, and is purchased from Guansu industry Co., ltd in hong Kong of Lian cloud;
excitant-3: aluminum sulfate, purchased from Zibo Zhengji aluminum salt chemical Co., ltd;
excitant-4: the mass ratio is 1:1 anhydrous sodium sulfate and aluminum sulfate; wherein, the anhydrous sodium sulphate is the same as that in the excitant-2, and the aluminum sulfate is the same as that in the excitant-3;
fine sand: the machine-made sand has the grain diameter of 0.075-1.18mm and is provided by New materials science and technology Co., ltd of the Zhongjiulike department;
fine powder: the machine-made sand has the grain diameter of less than 0.075mm and is from a machine-made sand production line of the new material science and technology company of the Chinese Union and gravity department;
in the following examples, 10g is represented per 1% by weight.
Example 1
The embodiment provides a method for preparing pneumatic shield grouting dry powder, which comprises the following steps:
first mixing (stirring speed of 400rpm, temperature of 25 ℃ and time of 3.5 min) 5wt% of cement clinker, 10 wt% of fluorgypsum, 20 wt% of slag, 20 wt% of steel slag, 1.5 wt% of modified bentonite, 28 wt% of fine powder, 15 wt% of fine sand and 0.5 wt% of excitant-1 to obtain dry powder S1 of the pneumatic shield grouting material.
The use method of the pneumatic shield grouting material dry powder in the embodiment comprises the following steps: transporting the prepared air-transportable shield grouting material dry powder to a construction site through a bulk transport vehicle and blowing the air-transportable shield grouting material dry powder into a mortar mobile silo, then conveying the air-transportable shield grouting material dry powder in the mobile silo to a material point for pulping through a mortar air-transportation system, and finally carrying out second mixing (stirring speed is 200rpm, temperature is 25 ℃, and time is 3 min) on the air-transportable shield grouting material dry powder and water to obtain shield grouting liquid, and injecting the shield grouting liquid into a grouting port to complete construction; wherein the mass ratio of the dry powder of the pneumatic shield grouting material to the water is 100:45.
example 2
The embodiment provides a method for preparing pneumatic shield grouting dry powder, which comprises the following steps:
first mixing (stirring speed of 400rpm, temperature of 30 ℃ and time of 3 min) 3 wt% of cement clinker, 8wt% of fluorgypsum, 25 wt% of slag, 15 wt% of steel slag, 1 wt% of modified bentonite, 28 wt% of fine powder, 19.4 wt% of fine sand and 0.6 wt% of excitant-2 to obtain dry powder S2 of the shield grouting material capable of being pneumatically conveyed.
The use method of the pneumatic shield grouting material dry powder in this embodiment refers to the use method in embodiment 1, except that the mass ratio of the pneumatic shield grouting material dry powder to water is 100:43.
example 3
The embodiment provides a method for preparing pneumatic shield grouting dry powder, which comprises the following steps:
4wt% of cement clinker, 6 wt% of fluorgypsum, 20 wt% of slag, 15 wt% of steel slag, 2 wt% of modified bentonite, 30 wt% of fine powder, 22.7 wt% of fine sand and 0.3 wt% of excitant-3 are subjected to first mixing (stirring speed is 200rpm, temperature is 30 ℃, time is 5 min) to obtain gaseously conveyed shield grouting material dry powder S3.
The use method of the pneumatic shield grouting material dry powder in this embodiment refers to the use method in embodiment 1, except that the mass ratio of the pneumatic shield grouting material dry powder to water is 100:50.
example 4
The embodiment provides a method for preparing pneumatic shield grouting dry powder, which comprises the following steps:
first mixing (stirring speed is 350rpm, temperature is 10 ℃, and time is 3 min) 5wt% of cement clinker, 8wt% of fluorgypsum, 15 wt% of slag, 30 wt% of steel slag, 1.2 wt% of modified bentonite, 25.2 wt% of fine powder, 15 wt% of fine sand and 0.6 wt% of activator-3 to obtain dry powder S4 of the pneumatic shield grouting material.
The use method of the pneumatic shield grouting material dry powder in this embodiment refers to the use method in embodiment 1, except that the mass ratio of the pneumatic shield grouting material dry powder to water is 100:40.
example 5
An air-transportable shield grouting dry powder was prepared according to the method of example 1, except that 14% by weight of fine sand and 29% by weight of fine powder were used, i.e., the weight ratio of the fine sand to the fine powder was 1:2.
the rest steps are the same as the example 1, and the pneumatic shield grouting slurry dry powder S5 is obtained.
The method of using the gassable shield grouting slurry dry powder in this example is the same as that in example 1.
Example 6
An air-transportable shield grouting dry powder was prepared according to the method of example 1, except that 19.5 wt% fine sand and 23.5 wt% fine powder were used, that is, the weight ratio of the fine sand to the fine powder was 1:1.2.
the rest steps are the same as the example 1, and the pneumatic shield grouting slurry dry powder S6 is obtained.
The method of using the gassable shield grouting slurry dry powder in this example is the same as that in example 1.
Comparative example 1
A dry powder of shield grouting material was prepared according to the method of example 1, except that modified bentonite was replaced with equal mass of sodium bentonite.
The rest steps are the same as the example 1, and the shield slurry dry powder DS1 is obtained.
The method of using the dry powder of the shield grouting agent in the comparative example is the same as that in example 1.
Comparative example 2
Preparing dry powder of shield grouting material according to the method of example 2, except that no excitant-2 is added and the amount of fine sand used is 20 wt%;
the specific operation method comprises the following steps:
first mixing (stirring speed of 400rpm, temperature of 25 ℃, time of 3.5 min) 3 wt% of cement clinker, 8wt% of fluorgypsum, 25 wt% of slag, 15 wt% of steel slag, 1 wt% of modified bentonite, 28 wt% of fine powder and 20 wt% of fine sand to obtain shield slurry DS2.
The method of using the dry powder of the shield grouting material in the comparative example is the same as that in example 1.
Comparative example 3
The present comparative example provides a method of preparing a dry shield slip formulation powder, the method comprising:
first mixing (stirring speed of 400rpm, temperature of 25 ℃, time of 3.5 min) 4wt% of cement clinker, 6 wt% of fluorgypsum, 15 wt% of slag, 15 wt% of steel slag, 2 wt% of modified bentonite, 2.7 wt% of fine powder, 55 wt% of fine sand and 0.3 wt% of activator-3 to obtain shield slurry dry powder DS3.
The method of using the dry powder of the shield grouting agent in the comparative example is the same as that in example 1.
Test example
The dry powder of the pneumatic shield grouting material, the shield grouting material and the constructed material prepared in the embodiment and the comparative example are subjected to performance tests respectively, the dry powder of the pneumatic shield grouting material is subjected to sifting detection before and after pneumatic transmission, the shield grouting material is subjected to fluidity detection and slurry bleeding rate detection, the constructed material is subjected to consolidation rate detection, 14d compressive strength detection and 28d compressive strength detection, and specific test results are shown in table 1.
The standard requirements refer to the performance requirements of Beijing local standard 'Ready-mix shield grouting material application technical Specification' (DB 11/T1608-2018) on grouting materials, and the fluidity and the consolidation rate in the test example are tested according to the method specified in DB 11/T1608-2018 'Ready-mix shield grouting material application technical Specification'; the bleeding rate test is carried out according to the relevant regulations in the current national standard GB/T50080 standard for testing the performance of common concrete mixtures. The slurry is filled into a sample barrel and cannot be vibrated or mashed.
The screen residue (0.15 mm) difference before and after air conveying refers to the separation condition of the mortar before and after air conveying, wherein the screen residue difference is obtained by sieving the shield grouting material respectively through a 0.15mm screen and after the shield grouting material is conveyed for 100m in air conveying, and the difference of the accumulated screen residue of the two parts of mortar is used for representing the separation condition of the mortar before and after air conveying.
The specific test method of the difference value of the screen residue (0.15 mm) before and after air conveying comprises the following steps: firstly, taking from mortar moving siloThe mortar before air delivery is tested and calculated according to a screening method specified in GB/T14684-2011 building sand, and the cumulative percent of residue screened A of a 0.15mm screen of the mortar 1 (ii) a Secondly, taking gas and sending the mortar of the shield grouting material with the length of 100m, and testing and calculating the cumulative percent screen residue A of a 0.15mm screen of the mortar according to a screening method specified in GB/T14684-2011 building sand 2 ；
Wherein, the calculation formula of the screen residue (0.15 mm) difference before and after air conveying is as follows: Δ a = | a 1 -A 2 L, formula 1);
and (4) judging the standard: when delta A is less than or equal to 3 percent, the mortar has no segregation before and after air conveying, and is very suitable for air conveying;
when delta A is more than 3% and less than or equal to 5%, the mortar is slightly isolated before and after air conveying, and can be conveyed by air;
when delta A is more than 5 percent, the segregation of the mortar before and after air conveying is obvious, and the mortar is not suitable for air conveying.
The compressive strength is tested according to JGJ/T70-2009 Standard test method for basic performance of building mortar.
TABLE 1
Table 1 (continuation watch)
The results in table 1 show that the dry powder of the shield grouting material formed by the dry powder composition of the shield grouting material provided by the invention can be transported by air without segregation, and has low bleeding rate and good quality stability.
Comparing example 1 with comparative example 1, it can be seen that the present invention modifies bentonite by a specific method and introduces the modified bentonite into the composition, which can improve the bleeding rate of grouting material; the bleeding rate of the grouting material in the comparative example 1 exceeds the standard, and the consolidation rate does not reach the standard.
By comparing the embodiment 1 with the comparative example 2, the invention can obtain the grouting material with compressive strength by compounding the solid wastes such as steel slag, fluorgypsum and the like, cement clinker, modified bentonite, exciting agent and sand powder with specific proportion; the 28d compressive strength of the slurry in comparative example 2 can not meet the use requirement.
Comparing the embodiment 1 with the comparative example 3, the invention adopts the sand powder combination with a specific proportion, and the grouting material dry powder with more excellent comprehensive performance can be obtained; in the comparative example 3, too much fine sand is used, so that the pneumatic conveying performance of the grouting material dry powder is poor, the fluidity is 45-90s, the fluctuation is large, and the pneumatic conveying dry powder mode can cause abnormal construction.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. The dry powder composition of the shield grouting material is characterized by comprising the following components which are independently stored or are mixed and stored:
cement clinker, fluorgypsum, slag, steel slag, modified bentonite, sand powder combination and an excitant;
the content of the cement clinker is 3-5wt%, the content of the fluorgypsum is 5-10 wt%, the content of the slag is 15-25 wt%, the content of the steel slag is 15-30 wt%, the content of the modified bentonite is 1-2 wt%, the content of the sand powder combination is 40-60 wt%, and the content of the exciting agent is 0.2-0.6 wt% based on the total weight of the composition;
the sand powder combination contains fine sand with the average particle size of 0.075mm-1.18mm and fine powder with the average particle size of not more than 0.075mm, and the weight ratio of the fine sand to the fine powder is 1:1.2-2;
the modified bentonite is prepared by performing sodium modification and intercalation modification on calcium bentonite, and the specific surface area of the modified bentonite is not less than 300m 2 /kg。
2. The composition of claim 1, wherein the weight ratio of the fine sand to the fine powder is 1:1.3-1.9; and/or
The fine sand is selected from at least one of machine-made sand, river sand and quartz sand; and/or
The fine powder is a by-product of machine-made quartz sand or machine-made limestone sand.
3. The composition of claim 1, wherein the modified bentonite is prepared by a process comprising the steps of: the preparation method comprises the following steps of (1) carrying out contact mixing I on calcium bentonite and a sodium carbonate solution to obtain a mixed solution I, and carrying out contact reaction I on the mixed solution I, polyacrylamide and guar gum; and/or
The conditions for contacting mix I include at least: stirring at 50-150rpm at 10-40 deg.C for 48-72 hr; and/or
The conditions of the contact reaction I at least comprise: the temperature is 10-40 ℃, and the time is 48-72h.
4. The composition according to claim 3, wherein the concentration of the sodium carbonate solution is 3-5wt%; and/or
Relative to 100g of calcium bentonite, the dosage of polyacrylamide is 0.5-2g, and the dosage of guar gum is 0.1-1g.
5. The composition according to any one of claims 1 to 4, wherein the cement clinker is a portland cement clinker having an average particle size of not more than 35 μm; and/or
The specific surface area of the cement clinker is not less than 400m 2 /kg。
6. The composition according to any one of claims 1 to 4, wherein the content of calcium sulfate in the fluorogypsum is not less than 85% by weight, and the specific surface area of the fluorogypsum is not less than 300m 2 /kg。
7. The composition according to any one of claims 1 to 4, wherein the slag is a slag powder having an average particle diameter of not more than 25 μm and a specific surface area of not less than 400m 2 (iv) kg; and/or
The steel slag is steel slag powder with the average particle size of not more than 20 mu m, and the specific surface area of the steel slag is not less than 450m 2 Per kg; and/or
The exciting agent is at least one of alum, anhydrous sodium sulphate and aluminum sulfate.
8. A method of preparing a dry powder of an air-transportable shield grouting material, the method comprising: first mixing the components of the composition of any one of claims 1-7.
9. An air transportable shield grouting dry powder prepared by the method of claim 8.
10. A method of using the pneumatically transportable shield grouting dry powder of claim 9, the method comprising: conveying the gassable shield grouting material dry powder to a material point for pulping by a gassable method, and carrying out second mixing on the gassable shield grouting material dry powder and water, wherein the mass ratio of the gassable shield grouting material dry powder to the water is 100: (40-50).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211441639.4A CN115784696B (en) | 2022-11-17 | 2022-11-17 | Shield grouting material dry powder composition, pneumatically-transportable shield grouting material dry powder, and preparation method and use method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211441639.4A CN115784696B (en) | 2022-11-17 | 2022-11-17 | Shield grouting material dry powder composition, pneumatically-transportable shield grouting material dry powder, and preparation method and use method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115784696A true CN115784696A (en) | 2023-03-14 |
| CN115784696B CN115784696B (en) | 2023-08-29 |
Family
ID=85438611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211441639.4A Active CN115784696B (en) | 2022-11-17 | 2022-11-17 | Shield grouting material dry powder composition, pneumatically-transportable shield grouting material dry powder, and preparation method and use method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115784696B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113716922A (en) * | 2021-09-01 | 2021-11-30 | 湖北大学 | Shield synchronous grouting material and preparation method thereof |
| CN113800791A (en) * | 2020-06-17 | 2021-12-17 | 宝山钢铁股份有限公司 | Cementing material and preparation method and application thereof |
| CN114230270A (en) * | 2021-12-07 | 2022-03-25 | 华南理工大学 | Shield synchronous grouting material and preparation method thereof |
-
2022
- 2022-11-17 CN CN202211441639.4A patent/CN115784696B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113800791A (en) * | 2020-06-17 | 2021-12-17 | 宝山钢铁股份有限公司 | Cementing material and preparation method and application thereof |
| CN113716922A (en) * | 2021-09-01 | 2021-11-30 | 湖北大学 | Shield synchronous grouting material and preparation method thereof |
| CN114230270A (en) * | 2021-12-07 | 2022-03-25 | 华南理工大学 | Shield synchronous grouting material and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115784696B (en) | 2023-08-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102765889B (en) | Preparation method for tailing barren rock-made high-strength concrete containing coal ash | |
| CN103113056B (en) | Mortar and preparation method thereof | |
| US20140199488A1 (en) | Cement Hydrate Products For Sprayed Concrete | |
| CN102887693A (en) | Filling and consolidating powder for mining purposes and use thereof | |
| CN106220216A (en) | A kind of high-strength mining expansion filling fireproofing extinguishing materials and using method thereof | |
| CN102666426A (en) | Hydraulic binder comprising a ground blast furnace slag | |
| CN113321468B (en) | Coal gangue cemented filling material and high-fluidity high-solid-content cemented filling material slurry | |
| CN110981304B (en) | Anti-cracking and anti-permeability concrete and preparation process thereof | |
| CN111072296A (en) | Quick-setting filling cementing material | |
| CN108101483A (en) | It is a kind of for early-strength cement base sealing material of gas pumping and preparation method thereof | |
| CN113307589B (en) | High-performance filling cementing material and preparation method thereof | |
| CN112897971A (en) | Self-flowing cemented filling material containing superfine tail mud and preparation method and application thereof | |
| CN104211353A (en) | Concrete for non-autoclaved PHC tubular pile | |
| CN104973813A (en) | Mineral slag micro powder and preparation method thereof | |
| CN114772963A (en) | Tailing curing and filling method, filling material, cementing agent, preparation method and preparation system thereof | |
| CN113402246B (en) | High-concentration slurry material and preparation method and application thereof | |
| CN108546009B (en) | CaCO doped with multi-scale particle size3High performance concrete slurry admixture | |
| CN110330304B (en) | High-water-content rapid-setting gob-side entry retaining material and preparation and use methods thereof | |
| CN115784696B (en) | Shield grouting material dry powder composition, pneumatically-transportable shield grouting material dry powder, and preparation method and use method thereof | |
| CN115073117B (en) | Mining low-temperature ultra-high crystal water rapid-hardening filling support material and preparation method thereof | |
| CN109748556A (en) | Anti- isolation loaded concrete of one kind and preparation method thereof | |
| CN115010428A (en) | Building 3D printing material, preparation method and application thereof, and product | |
| CN110981257B (en) | Alkali-free and chlorine-free concrete accelerator based on magnesium carbonate trihydrate | |
| JP2015124097A (en) | Concrete composition and method for production thereof | |
| CN113526941A (en) | Gob-side entry retaining roadside filling support material using modified industrial gypsum to cure red mud and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |