CN111825393A - Proportioning method of high-content fly ash grouting raw material - Google Patents
Proportioning method of high-content fly ash grouting raw material Download PDFInfo
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- 239000010881 fly ash Substances 0.000 title claims abstract description 70
- 239000002994 raw material Substances 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000004568 cement Substances 0.000 claims abstract description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000002002 slurry Substances 0.000 claims abstract description 50
- 238000012360 testing method Methods 0.000 claims abstract description 23
- 230000008859 change Effects 0.000 claims abstract description 17
- 238000001556 precipitation Methods 0.000 claims abstract description 15
- 238000000926 separation method Methods 0.000 claims abstract description 14
- 238000007596 consolidation process Methods 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 5
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- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical group [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 4
- 230000000996 additive effect Effects 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
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- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00991—Uses not provided for elsewhere in C04B2111/00 for testing
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
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- C04B2111/2015—Sulfate resistance
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/26—Corrosion of reinforcement resistance
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
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Abstract
The invention discloses a proportioning method of a high-doped fly ash grouting raw material, wherein the high-doped fly ash grouting raw material comprises cement, fly ash and water, and the proportioning method comprises the following steps: s1, performing a preliminary test; s2, optimizing the proportioning test; s3, drawing a curve graph, determining a consolidation effect change rule of the slurry according to the slurry water separation rate and the slurry density increase amplitude, and summarizing the change rule; and S4, selecting a corresponding proportion according to the change rule determined in the step S3 and the grouting requirement. The invention obtains the consolidation effect, the setting time and the change rule of the compressive strength by free water precipitation test of the slurry with different proportions of the large-volume fly ash cement material, thereby being capable of selecting the corresponding proportion according to the strength requirement of grouting reinforced roof and the setting time requirement of the slurry and having important significance for ensuring the engineering quality and reducing the engineering cost.
Description
Technical Field
The invention relates to the field of coal mining grouting, in particular to a proportioning method of a high-content fly ash grouting raw material.
Background
Coal is important basic energy and raw materials in China, scientific coal mining is reasonably designed, the inevitable trend of realizing safe and efficient production of coal mines is realized, in order to control the occurrence of accidents of coal mining roofs directly under a caving zone, mineral engineers begin to practice to adopt underground bedding drilling pre-grouting for reinforcing the roofs, materials which are used for grouting in the earliest aspect of engineering technology are lime and clay, cement is used for grouting in 1856 years, and the cement is injected in a single-liquid mode. The grouting material for the old goaf has large engineering requirement, low cost and high strength, and the injection process is simple and easy to operate, and generally adopts local materials as much as possible, so that materials such as cement, clay, fly ash, sand and the like are mostly adopted for filling and reinforcing.
The fly ash is associated waste discharged by a coal-fired power plant, and is fine powder with volcanic ash activity. The slurry prepared by the fine particles of the fly ash and cementing materials such as cement and the like has better stability and fluidity, can make up for some defects of cement grouting materials, improve certain properties of the grouting materials, reduce water demand during grouting construction, facilitate construction operation, expand the application range of the grouting materials, meet different engineering requirements, and is increasingly widely applied to grouting engineering.
The grouting reinforcement material is used as a cementing material of broken rock masses, so that the broken rock masses are cemented together to achieve certain cementing strength, and the aim of preventing top leakage is achieved during working face extraction. Due to the particularity of goaf grouting, requirements on strength and fineness of a grouting material are relatively low, if single-liquid cement frame grouting is adopted, the strength is too high, materials are wasted, the construction cost is improved, and if mixed grouting with pure fly ash, clay or cement with too little content is adopted, early strength is not enough and segregation is possibly caused, and the construction quality is difficult to guarantee. Therefore, the reasonable design of the proportioning of the large-volume fly ash cement material and the understanding of the physical and mechanical properties and the optimal slurry proportioning are of great significance to the guarantee of the engineering quality and the reduction of the engineering cost.
Disclosure of Invention
In order to solve the above-mentioned deficiencies in the background art, the invention aims to provide a proportioning method of a high-volume fly ash grouting raw material, which obtains a change rule of a consolidation effect of slurry determined by a slurry water precipitation rate and a slurry density increase amplitude through a slurry free water precipitation test of a large-volume fly ash cement material with different proportioning, and a change rule of a setting time and a compressive strength of fly ash with different water-cement ratios in the same water-cement ratio and the same solid-cement ratio, so that a corresponding proportioning can be selected according to a strength requirement of grouting reinforcement of a top plate and a setting time requirement of the slurry.
The purpose of the invention can be realized by the following technical scheme:
a proportioning method of a high-doped fly ash grouting raw material, wherein the high-doped fly ash grouting raw material comprises cement, fly ash and water, and the proportioning method comprises the following steps:
s1, preliminary test: selecting 2 proportions, adopting standing to test the free water separation process of the mixed slurry under the action of gravity, and measuring the water absorption rate, the calculus rate and the compressive strength of the slurry;
s2, optimizing the mixture ratio test: reselecting 6 proportions according to the test result in the step S1 to carry out free water separation test, fully and uniformly stirring the slurries with the proportions, respectively taking 3 groups of samples from the slurries with the proportions to carry out free water separation under the action of gravity, and measuring and recording the water separation rate, density, setting time and compressive strength data of each group;
s3, drawing a slurry water precipitation rate curve graph and a density change curve graph according to the data obtained in the step S2, determining a consolidation effect change rule of the slurry according to the slurry water precipitation rate and the slurry density increase amplitude, and determining a setting time and a compression strength change rule of the fly ash with different solid-to-cement ratios in the same water-to-cement ratio and different water-to-cement ratios in the same solid-to-cement ratio according to the data obtained in the step S2;
and S4, selecting a corresponding proportion according to the consolidation effect, the setting time and the compression strength change rule of the grout determined in the step S3 and combining the strength requirement of grouting reinforced roof and the setting time requirement of the grout.
Preferably, the mass ratio of cement, fly ash and water in the high-doped fly ash grouting raw material is 1-3: 7-9: 8-10.
Preferably, the mass ratio of cement, fly ash and water in the high-doped fly ash grouting raw material is 2:8: 10.
preferably, the cement mark is P.C42.5 ordinary portland cement, and the quality of the cement meets the GB175-92 standard.
Preferably, the fly ash is more than two-grade ash, the particle size of the fly ash is less than or equal to 0.1mm, and the fly ash comprises the following chemical components in percentage by mass: fe2O33-20％、SiO210-70％、Al2O310-38％、CaO 0.5-30％、MgO 0.3-0.7％、Na2O0.4-0.7% and K2O 0.8-1.5％。
Preferably, the high-doped fly ash grouting raw material further comprises an exciting agent and an additive, wherein the exciting agent is an alkaline substance and an alkali metal salt, and the additive comprises a sulfate and a chloride.
Preferably, the trigger is Ca (OH)2The chloride salt is NaCl or CaCl2。
Preferably, the standing test in step S2 is performed by using a 100mm glass measuring cylinder to perform the slurry standing free water separation, the liquid level height is recorded every 10 minutes, each set of test is repeated 3 times, and the average value is taken as the data.
Preferably, the compressive strength in step S2 is measured by an indoor uniaxial compression test.
The invention has the beneficial effects that:
the fly ash is used as the admixture of mortar or concrete, and the fly ash is added into the concrete to replace part of cement or fine aggregate, so that the cost can be reduced, the workability of the concrete can be improved, the impermeability, the gas resistance, the sulfate resistance and the chemical corrosion resistance can be improved, the hydration heat can be reduced, the high temperature resistance of the concrete can be improved, the particle separation and water precipitation phenomena can be reduced, the shrinkage and cracking of the concrete can be reduced, and the corrosion of stray current to reinforcing steel bars in the concrete can be inhibited;
the proportioning method of the invention obtains the change rule of the consolidation effect of the slurry determined by the water precipitation rate of the slurry and the increase range of the slurry density through free water precipitation test of the slurry with different proportioning of the large-volume fly ash cement material and the measurement of the water precipitation rate, the density, the setting time and the compressive strength, and the change rule of the setting time and the compressive strength of the fly ash with different water-cement ratios in the same water-cement ratio and the same solid-cement ratio, thereby selecting the corresponding proportioning according to the strength requirement of grouting reinforced roof and the setting time requirement of the slurry, and having important significance for ensuring the engineering quality and reducing the engineering cost.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a graph of water separation rates of slurries of different ratios according to the present invention;
FIG. 2 is a graph showing the variation of density according to different ratios of the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "opening," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like are used in an orientation or positional relationship that is merely for convenience in describing and simplifying the description, and do not indicate or imply that the referenced component or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present invention.
A proportioning method for the high-content powdered coal ash as grouting raw material includes such steps as mixing cement P.C42.5 ordinary silicon with powdered coal ash and waterThe acid salt cement is more than two-grade ash generated by a power plant of Huaibei mining industry clinical melt China, and the fly ash comprises the following chemical components in percentage by mass: fe2O311.21％、SiO251.38％、Al2O320.23％、CaO3.94％、MgO 1.25％、Na2O0.45% and K2O1.48%, and the proportioning method comprises the following steps: .
S1, preliminary test: the cement/fly ash/water mixed slurry is tested for free water separation under the action of gravity. The preliminary test adopts 2 groups of proportioning modes (weight ratio) which are respectively 7: 3: 10 and 5: 5:10, the water separation rate of the slurry is very low, the calculus rate is very high, and two groups of 28-day compressive strength are both more than 4MPa, which is shown in a table 1:
TABLE 1 preliminary test for free water separation of slurries
S2, optimizing the mixture ratio test: the selected cement, the fly ash and the water are respectively in mass ratio: the method comprises the following steps of performing tests in six groups of 3:7:10, 2:8:10, 1.5:8.5:10, 1:9:10, 2:8:8 and 1:9:8, standing and freely separating the slurry by using a 100mm glass measuring cylinder, recording the liquid level height every 10 minutes, repeating the tests of each group for 3 times, taking an average value as adopted data, measuring and recording the separated water volume, density, setting time and compressive strength data of each group, measuring the compressive strength by using an indoor uniaxial compression test, and referring the water absorption data of each group to the following table 2 and referring the setting time and compressive strength data to the following table 3;
table 2 free water precipitation amount of each ratio of slurry after standing
TABLE 3 test results of different ratios of (cement + fly ash)/water mixed slurry
S3, drawing a graph of the water precipitation rate of the slurry according to the data obtained in the step S2, which is shown in figure 1, a graph of the density change is shown in figure 2, and the cement can be seen from figure 1: fly ash: the water ratio is 3:7: under the condition of 10, the water precipitation rate of the slurry is highest, and the cement: fly ash: the water ratio is 1:9: under the condition of 8, the water precipitation rate of the slurry is lowest, and as can be seen from figure 2, the cement: fly ash: the water ratio is 3:7:10, the slurry density increases with time to the highest extent, and the cement: fly ash: the water ratio is 1:9: under the condition of 8, the increase amplitude of the slurry density along with the time is the lowest, and the combination of the two shows that the cement: fly ash: the water ratio is 3:7: the slurry has the best consolidation effect under the condition of 10, and the cement: fly ash: the water ratio is 1:9: the slurry consolidation was the least effective under condition 8.
As can be seen from Table 2, for the setting time, the setting time of the fly ash is prolonged along with the increase of the amount of the fly ash in the solid phase when the same water-ash ratio is different from the solid phase ratio: according to No. 1 and No. 2, when the water-cement ratio is 1:1 and the solid phase ratio is 3:7, the initial setting time and the final setting time of the slurry are respectively 23h and 26h, when the solid phase ratio is 2:8 (and the mixing amount of the fly ash in the solid phase is increased), the initial setting time and the final setting time of the slurry are respectively increased to 27h and 38h, the initial setting time is prolonged by 4h compared with the previous solid phase ratio, the final setting time is prolonged by 12h compared with the previous solid phase ratio, and other groups also have the same rule; when the same solid phase ratio is different from the water-cement ratio, the setting time of the fly ash is prolonged along with the increase of the water-cement ratio: according to the 4# and 6# rules, when the solid-to-liquid ratio is 1:9 and the water-to-cement ratio is 1:1, the initial setting time and the final setting time of the fly ash are respectively 40h and 48h, when the water-to-cement ratio is 1:0.8, the initial setting time and the final setting time of the fly ash are respectively 95h and 104h, the initial setting time is prolonged by 55h compared with the previous water-to-cement ratio, the final setting time is prolonged by 92h compared with the previous water-to-cement ratio, and the rules can also be compared with the rules of No. 2 and No. 5.
It can also be seen from table 2 that, for compressive strength, the compressive strength of the slurry decreases with increasing fly ash loading for the same water-to-ash ratio and different solid-to-solid ratios: in 1#, 2#, 3# and 4#, the water-cement ratio is 1:1, the solid-phase ratio is continuously reduced, the mixing amount of the fly ash is increased, and the compressive strength is gradually reduced. The compressive strength of the slurry is reduced along with the increase of the mixing amount of the fly ash when the same solid phase ratio is different from the water-cement ratio: the solid-phase ratio in No. 2 and No. 5 is 2:8, the water-cement ratio is increased from 1:1 to 1:0.8, and the strength is correspondingly reduced.
S4, selecting the mixture ratio: most grouting materials of cement and water glass are adopted in grouting engineering, but aiming at the problem that a roof is reinforced directly under a collapse zone, on one hand, the strength requirement of the roof to be reinforced is not high, on the other hand, the setting time of slurry is long, under the requirement, through the proportioning method, although the initial setting time of three groups of samples, namely 4#, 5#, and 6# is long, the (28-day) compressive strength is less than 1MPa, the requirement of the grouting reinforcement is obviously not met, the compressive strength of the 2# proportioning samples is more than 1MPa under several conditions, and the condensing time meets the engineering requirement, so the 2# proportioning sample is selected in the grouting, and the proportioning is finely adjusted in time according to the grouting condition.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (9)
1. The proportioning method of the high-doped fly ash grouting raw material is characterized in that the high-doped fly ash grouting raw material comprises cement, fly ash and water, and the proportioning method comprises the following steps:
s1, preliminary test: selecting 2 proportions, adopting standing to test the free water separation process of the mixed slurry under the action of gravity, and measuring the water absorption rate, the calculus rate and the compressive strength of the slurry;
s2, optimizing the mixture ratio test: reselecting 6 proportions according to the test result in the step S1 to carry out free water separation test, fully and uniformly stirring the slurries with the proportions, respectively taking 3 groups of samples from the slurries with the proportions to carry out free water separation under the action of gravity, and measuring and recording the water separation rate, density, setting time and compressive strength data of each group;
s3, drawing a slurry water precipitation rate curve graph and a density change curve graph according to the data obtained in the step S2, determining a consolidation effect change rule of the slurry according to the slurry water precipitation rate and the slurry density increase amplitude, and determining a setting time and a compression strength change rule of the fly ash with different solid-to-cement ratios in the same water-to-cement ratio and different water-to-cement ratios in the same solid-to-cement ratio according to the data obtained in the step S2;
and S4, selecting a corresponding proportion according to the consolidation effect, the setting time and the compression strength change rule of the grout determined in the step S3 and combining the strength requirement of grouting reinforced roof and the setting time requirement of the grout.
2. The proportioning method of the high-doped fly ash grouting raw material according to claim 1, wherein the mass ratio of cement, fly ash and water in the high-doped fly ash grouting raw material is 1-3: 7-9: 8-10.
3. The proportioning method of the high-doped fly ash grouting raw material according to claim 1, wherein the mass ratio of cement, fly ash and water in the high-doped fly ash grouting raw material is 2:8: 10.
4. a proportioning method of a high-content fly ash grouting raw material according to claim 1, characterized in that the cement label is P.C42.5 ordinary portland cement, and the quality of the cement is in accordance with GB175-92 standard.
5. The proportioning method of high-content fly ash grouting raw material according to claim 1,the fly ash is more than two-grade ash, the particle size of the fly ash is less than or equal to 0.1mm, and the fly ash comprises the following chemical components in percentage by mass: fe2O33-20％、SiO210-70％、Al2O310-38％、CaO 0.5-30％、MgO 0.3-0.7％、Na2O0.4-0.7% and K2O 0.8-1.5％。
6. The proportioning method of the high-dosage fly ash grouting raw material according to claim 1, wherein the high-dosage fly ash grouting raw material further comprises an exciting agent and an additive, the exciting agent is an alkaline substance and an alkali metal salt, and the additive comprises a sulfate and a chloride.
7. The proportioning method of high-volume fly ash grouting raw material according to claim 1, characterized in that the excitant is Ca (OH)2The chloride salt is NaCl or CaCl2。
8. The proportioning method of the high-content fly ash grouting raw material according to claim 1, wherein in the step S2, a glass measuring cylinder with a diameter of 100mm is used for standing free water separation of the slurry, the liquid level height is recorded every 10 minutes, each group of tests is repeated 3 times, and the average value is taken as the sampling data.
9. The proportioning method of high-content fly ash grouting raw material according to claim 1, wherein the compressive strength in step S2 is measured by indoor uniaxial compression test.
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