CN111217563A - Low-temperature-resistant early-strength quick-setting slurry and preparation method thereof - Google Patents
Low-temperature-resistant early-strength quick-setting slurry and preparation method thereof Download PDFInfo
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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
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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
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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
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention belongs to the technical field of grouting, and particularly relates to low-temperature-resistant early-strength quick-setting slurry and a preparation method thereof, wherein the slurry comprises a material A and a material B in parts by weight; the material A comprises the following components: 80-100 parts of cement and 10-20 parts of fly ash; the material B comprises the following components: 5-10 parts of bentonite mineral component, 2-3 parts of calcium formate, 4-6 parts of sodium chloride, 0.05-0.08 part of lithium carbonate and 80-120 parts of water; taking the weight parts of cement as a reference; wherein the low temperature resistant temperature of the slurry is 0-5 ℃. The invention can improve the fluidity and stability of the slurry, shorten the setting time of the slurry in a low-temperature environment of 0-5 ℃, improve the early strength and have good construction effect.
Description
Technical Field
The invention belongs to the technical field of grouting, and relates to grouting technology for slope and landslide treatment engineering in a low-temperature environment and well wall plugging engineering in a unfreezing process of a frozen shaft, in particular to low-temperature-resistant early-strength quick-setting slurry and a preparation method thereof.
Background
At present, in the engineering construction processes of anchoring a slope and a landslide anchor rod anchor cable, reinforcing and seepage-proofing an overfrozen soil layer section of a coal mine shaft by deformation and damage, unfreezing, grouting and water plugging of an overfrozen saturated sand layer of a frozen shaft and the like in the areas of Qinghai, inner Mongolia, Xinjiang, Shaanbei and the like, cement grout is mostly adopted for grouting for anchoring the anchoring section, reinforcing the shaft, preventing seepage and plugging water, and the problems of long coagulation time of grouting grout in a low-temperature area, slow strength increase after grout is solidified, poor effect and the like can be encountered in the construction process, so that a new problem is brought to the conventional cement grout grouting.
Along with the obvious improvement of the grouting treatment effect, and because the cement grout has wide and stable material sources, flexible and convenient arrangement and strong adaptability, the anchor rod and the anchor cable can be effectively anchored, the shaft can be reinforced, and the seepage-proofing and leakage-stopping can be realized, so that the grouting material can be widely applied and developed in landslide anchoring treatment, shaft reinforcement and seepage-proofing and water-stopping projects. However, the cement slurries currently in use also present some drawbacks:
(1) the double-slurry is mainly formed by mixing slurry consisting of cement, fly ash and water with water glass, and has the defects of short coagulation time, simultaneous management of double-slurry during construction, easy blockage of a grouting pipeline, complex process, high early strength, low later strength, poor adaptability and the like in grouting;
(2) the single liquid slurry mainly comprises cement, fly ash and water, and has the defects of easy segregation, poor dispersibility, longer setting time and low early strength;
(3) particularly, in a low-temperature environment of 0-5 ℃, the setting time of cement slurry is greatly prolonged, the early strength is extremely low, the later strength is slowly increased, the treatment effect is poor, and the construction quality and the safety of landslides and mineshafts are difficult to guarantee.
Because the conventional cement slurry has the defects of easy segregation, long setting time, low early strength, uncontrollable setting time and strength, large safety risk and the like, the low-temperature-resistant early-strength quick-setting slurry has wide market prospect in the unfreezing and water-plugging engineering after the anchoring section of a landslide, the deformation and reinforcement of a shaft permafrost region and the freezing method construction of a thick loose aquifer. The grout with excellent performance in a low-temperature environment of 0-5 ℃ can be suitable for anchoring sections of soil landslides and rock landslides in freeze thawing areas, the shaft is deformed and reinforced in the freeze thawing areas, and water is thawed and blocked after freezing construction of thick loose aquifers, so that the grout is particularly suitable for emergency rescue engineering of grouting and water blocking of railways and road tunnels in the low-temperature areas or water inrush of coal mine shafts.
In view of the defects, the research of the low-temperature-resistant early-strength quick-setting slurry and the preparation method thereof have important significance.
Disclosure of Invention
The invention aims to solve the problems that grouting slurry in a low-temperature (e.g. 0-5 ℃) freezing and melting region in northwest China is easy to have long setting time, low early strength, easy segregation and uncontrollable strength, and aims to solve the problems that grouting slurry in a rock landslide anchoring section anchoring region, a shaft frozen soil region is deformed and reinforced, unfreezing and water plugging are easily caused after thick loose aquifer freezing method construction, and the like, and provide low-temperature-resistant early-strength rapid-setting slurry and a preparation method thereof, wherein the fluidity and the stability of the slurry can be improved, and meanwhile, the setting time of the slurry in a low-temperature environment of 0-5 ℃ is shortened, the early strength is improved, and the construction effect is good.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
in one aspect, a low temperature resistant early strength quick setting slurry is provided, which comprises a material A and a material B;
the material A comprises the following components:
the dosage of each component of the material A and the material B is parts by weight, and the parts by weight of the cement is taken as a reference;
wherein the low temperature resistant temperature of the low temperature resistant early strength quick setting slurry is 0～5 deg.C (e.g., 1 deg.C, 2 deg.C, 4 deg.C).
For example, the slurry includes a material A and a material B;
the material A comprises the following components:
80 parts of cement, namely cement, a cement paste,
10-20 parts of fly ash (for example, 12 parts, 15 parts and 18 parts);
the material B comprises the following components:
the dosage of each component of the material A and the material B is parts by weight, and the parts by weight of the cement is taken as a reference.
For example, the slurry includes a material A and a material B;
the material A comprises the following components:
90 parts of cement, namely cement, wherein the cement is mixed with the cement,
10-20 parts of fly ash (for example, 12 parts, 15 parts and 18 parts);
the material B comprises the following components:
the dosage of each component of the material A and the material B is parts by weight, and the parts by weight of the cement is taken as a reference.
For example, the slurry includes a material A and a material B;
the material A comprises the following components:
100 parts of cement, namely 100 parts of cement,
10-20 parts of fly ash (for example, 12 parts, 15 parts and 18 parts);
the material B comprises the following components:
the dosage of each component of the material A and the material B is parts by weight, and the parts by weight of the cement is taken as a reference.
According to the low temperature resistant early strength quick setting slurry provided by the invention, in some embodiments, the slurry comprises a material A and a material B;
the material A comprises the following components:
80-100 parts (for example, 85 parts, 92 parts, 95 parts and 98 parts) of cement,
10-20 parts of fly ash (for example, 12 parts, 15 parts and 18 parts);
the material B comprises the following components:
the dosage of each component of the material A and the material B is parts by weight, and the parts by weight of the cement is taken as a reference;
wherein the low-temperature resistant temperature of the low-temperature resistant early-strength quick-setting slurry is 0-5 ℃.
For example, the slurry includes a material A and a material B;
the material A comprises the following components:
90 parts of cement, namely cement, wherein the cement is mixed with the cement,
10-20 parts of fly ash (for example, 12 parts, 15 parts and 18 parts);
the material B comprises the following components:
the dosage of each component of the material A and the material B is parts by weight, and the parts by weight of the cement is taken as a reference.
For example, the slurry includes a material A and a material B;
the material A comprises the following components:
100 parts of cement, namely 100 parts of cement,
10-20 parts of fly ash (for example, 12 parts, 15 parts and 18 parts);
the material B comprises the following components:
the dosage of each component of the material A and the material B is parts by weight, and the parts by weight of the cement is taken as a reference.
In some embodiments, the slurry consists of a material a and a material B;
the material A comprises the following components:
80-100 parts (for example, 85 parts, 92 parts, 95 parts and 98 parts) of cement,
10-20 parts of fly ash (for example, 12 parts, 15 parts and 18 parts);
the material B comprises the following components:
the dosage of each component of the material A and the material B is parts by weight, and the parts by weight of the cement is taken as a reference;
wherein the low-temperature resistant temperature of the low-temperature resistant early-strength quick-setting slurry is 0-5 ℃.
For example, the slurry consists of material a and material B;
the material A comprises the following components:
90 parts of cement, namely cement, wherein the cement is mixed with the cement,
10-20 parts of fly ash (for example, 12 parts, 15 parts and 18 parts);
the material B comprises the following components:
the dosage of each component of the material A and the material B is parts by weight, and the parts by weight of the cement is taken as a reference.
For example, the slurry consists of material a and material B;
the material A comprises the following components:
100 parts of cement, namely 100 parts of cement,
10-20 parts of fly ash (for example, 12 parts, 15 parts and 18 parts);
the material B comprises the following components:
the dosage of each component of the material A and the material B is parts by weight, and the parts by weight of the cement is taken as a reference.
In some embodiments, the slurry consists of a material a and a material B;
the material A comprises the following components:
80-100 parts (for example, 85 parts, 92 parts, 95 parts and 98 parts) of cement,
10-20 parts of fly ash (for example, 12 parts, 15 parts and 18 parts);
the material B comprises the following components:
the dosage of each component of the material A and the material B is parts by weight, and the parts by weight of the cement is taken as a reference;
wherein the low-temperature resistant temperature of the low-temperature resistant early-strength quick-setting slurry is 0-5 ℃.
For example, the slurry consists of material a and material B;
the material A comprises the following components:
90 parts of cement, namely cement, wherein the cement is mixed with the cement,
10-20 parts of fly ash (for example, 12 parts, 15 parts and 18 parts);
the material B comprises the following components:
the dosage of each component of the material A and the material B is parts by weight, and the parts by weight of the cement is taken as a reference.
For example, the slurry consists of material a and material B;
the material A comprises the following components:
100 parts of cement, namely 100 parts of cement,
10-20 parts of fly ash (for example, 12 parts, 15 parts and 18 parts);
the material B comprises the following components:
the dosage of each component of the material A and the material B is parts by weight, and the parts by weight of the cement is taken as a reference.
According to the low-temperature-resistant early-strength quick-setting slurry provided by the invention, in some examples, the cement is ordinary portland cement of PO 42.5; i.e. a 42.5 strength grade of ordinary portland cement.
In some examples, the fly ash is class ii and above power plant dry ash; for example, a class ii power plant dry ash, a class I power plant dry ash, or a combination thereof.
In some examples, the bentonite mineral constituent contains 85% to 98% montmorillonite; in some preferred embodiments, the bentonite mineral constituent has a particle size of 200 mesh.
In some examples, the calcium formate is analytically pure 99% and above (e.g., 99.2%, 99.5%, 99.8%) C2H2O4Ca。
In some examples, the sodium chloride is NaCl that is analytically pure 99% and above (e.g., 99.2%, 99.5%, 99.8%).
In some examples, the lithium carbonate is analytically pure 99% and above (e.g., 99.2%, 99.5%, 99.8%) Li2CO3。
In the invention, the bentonite mineral component can be added to enable the obtained slurry to have better fluidity and stability. The early strength and low temperature resistance of the resulting cement slurry can be improved by the addition of calcium formate, sodium chloride and lithium carbonate.
In another aspect, there is provided a method for preparing the low temperature resistant early strength quick setting slurry, comprising the steps of:
1) contacting and mixing bentonite mineral components, calcium formate, sodium chloride, lithium carbonate and water according to the using amount parts, and uniformly stirring to obtain a mixture i (for example, the material B);
2) contacting and mixing cement and fly ash with the mixture i obtained in the step 1) according to the parts by weight, and uniformly stirring for 90-120s to obtain the low-temperature-resistant early-strength quick-setting slurry.
In some examples, the cement and the fly ash in the step 2) are contacted with the mixture i obtained in the step 1) for mixing, for example, the cement and the fly ash can be added into the mixture i obtained in the step 1) while stirring, and the addition is completed within 30 s.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. the obtained slurry has good fluidity and stability. In some embodiments, the obtained grout has high fluidity (for example, the viscosity can reach 1.5-2.0 Pa.s), and high solid rate (for example, 80% -90%), so that the grout can effectively anchor bolts and anchor cables, reinforce slopes and prevent seepage and leakage during grouting.
2. Under the low-temperature environment of 0-5 ℃, the initial setting time and the final setting time of the obtained slurry are both shortened; in some embodiments, the initial setting time of the resulting slurry is shorter (e.g., 12-14 hours), which can be about 50% shorter; the final setting time of the resulting slurry is also short (e.g., 16-18h), which is about 50% shorter; meanwhile, the obtained slurry can meet the requirements of reinforcing, seepage-proofing and leakage-stopping of anchor rod and anchor cable anchoring sections and shafts.
3. In some embodiments, the resulting slurry has a high early strength (e.g., a 7d strength of 13-18MPa, a 14d strength of 18-28MPa, and a 28d strength of 26-35 MPa).
4. In the process of preparing the slurry, the required raw materials are widely distributed, the sources are rich, the price is low, the process is simple and convenient, and the method is easy to realize.
Detailed Description
In order to better understand the technical solution of the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.
< raw Material information >
Cement, which is PO42.5 cement produced by special cement company of Gezhou dam Shimen;
fly ash, grade II dry ash from a middle-connected power plant;
bentonite mineral components, sodium bentonite purchased from Sichuan and Xinrunda mining Co., Ltd, the granularity of the sodium bentonite is 200 meshes, and the content of montmorillonite is 98%;
calcium formate (C) analytical pure 99.8% from Ziborubi chemical Co., Ltd2H2O4Ca)；
Sodium chloride, analytically pure 99.5% sodium chloride (NaCl) available from dingshengxin chemical ltd, tianjin;
lithium carbonate, analytically pure 99.5% lithium carbonate (Li) available from Xinjiang Haoxin lithium salt development Co., Ltd2CO3)。
< test methods >
Viscosity test of the slurry: a RST-CC paddle rheometer from Bohler fly (Brookfield) USA was used. Set by RHEO3000 software: and (3) adopting steady-state shearing, linearly increasing the designed shearing rate from 0s < -1 > to 40s < -1 >, then linearly decreasing the designed shearing rate to 0s < -1 >, and monitoring and outputting the relation of the viscosity changing along with the shearing rate in real time, wherein the test time is 120 s.
And (3) testing the setting rate of the slurry: and (3) injecting the newly-configured slurry to be measured into a 100ml measuring cylinder for standing, recording the volume of the water separated from the slurry after initial setting, and determining the percentage of the volume of the slurry stones to the total volume of the slurry as the setting rate.
Initial setting time test under low temperature environment of 0-5 ℃: testing according to a cement initial setting time test method in GBT1346-2011 'cement standard consistency water consumption, setting time and stability test method';
and (3) testing the final setting time in a low-temperature environment at 0-5 ℃: testing according to a cement final setting time test method in GBT1346-2011 'cement standard consistency water consumption, setting time and stability test method';
and (3) testing the compressive strength at the low temperature of 0-5 ℃: the test is carried out according to a neutral cube compression strength test method in JGJ/T70-2009 building mortar basic performance test method.
Example 1
The formula of the slurry (the dosage parts of the components are in parts by weight):
the cement-based bentonite comprises, by weight, 10 parts of fly ash, 5 parts of bentonite mineral component, 2 parts of calcium formate, 4 parts of sodium chloride, 0.05 part of lithium carbonate and 120 parts of water, wherein the cement is 80 parts.
The preparation method of the slurry comprises the following steps:
1) according to the weight parts in the formula given above, putting water, bentonite mineral components, sodium chloride, calcium formate and lithium carbonate into a slurry stirrer, and uniformly stirring for 50s to obtain a mixture i (namely, material B);
2) adding the cement and the fly ash into the mixture i obtained in the step 1) respectively according to the weight parts in the formula, stirring while adding, completing the adding within 30s, and uniformly stirring for 90-120s to obtain the slurry.
Tests show that the prepared slurry has the viscosity of 1.5 pas, the setting rate of 80 percent, the initial setting time of 14h at the low temperature environment of 3 ℃, the final setting time of 18h at the low temperature environment of 3 ℃, the 7d compressive strength of 13MPa, the 14d compressive strength of 18MPa and the 28d compressive strength of 26MPa at the low temperature environment of 3 ℃.
Example 2
The formula of the slurry (the dosage parts of the components are parts by weight) is as follows:
the cement-based bentonite comprises, by weight, 90 parts of cement, 10 parts of fly ash, 7 parts of bentonite mineral component, 3 parts of calcium formate, 4 parts of sodium chloride, 0.06 part of lithium carbonate and 100 parts of water.
The preparation method of the slurry comprises the following steps:
1) according to the weight parts in the formula given above, putting water, bentonite mineral components, sodium chloride, calcium formate and lithium carbonate into a slurry stirrer, and uniformly stirring for 50s to obtain a mixture i (namely, material B);
2) adding the cement and the fly ash into the mixture i obtained in the step 1) respectively according to the weight parts in the formula, stirring while adding, completing the adding within 30s, and uniformly stirring for 90-120s to obtain the slurry.
Tests show that the prepared slurry has the viscosity of 1.8 pas, the setting rate of 85 percent, the initial setting time of 13h under the low-temperature environment of 3 ℃, the final setting time of 17h under the low-temperature environment of 3 ℃, the 7d compressive strength of 16MPa, the 14d compressive strength of 22MPa and the 28d compressive strength of 31MPa under the low-temperature environment of 3 ℃.
Example 3
The formula of the slurry (the dosage parts of the components are parts by weight) is as follows:
based on 100 parts of cement, 20 parts of fly ash, 10 parts of bentonite mineral component, 3 parts of calcium formate, 6 parts of sodium chloride, 0.08 part of lithium carbonate and 80 parts of water.
The preparation method of the slurry comprises the following steps:
1) according to the weight parts in the formula given above, putting water, bentonite mineral components, sodium chloride, calcium formate and lithium carbonate into a slurry stirrer, and uniformly stirring for 50s to obtain a mixture i (namely, material B);
2) adding the cement and the fly ash into the mixture i obtained in the step 1) respectively according to the weight parts in the formula, stirring while adding, completing the adding within 30s, and uniformly stirring for 90-120s to obtain the slurry.
Tests show that the prepared slurry has the viscosity of 2.0 pas, the setting rate of 90 percent, the initial setting time of 12h at the low temperature environment of 3 ℃, the final setting time of 16h at the low temperature environment of 3 ℃, the 7d compressive strength of 18MPa, the 14d compressive strength of 28MPa and the 28d compressive strength of 35MPa at the low temperature environment of 3 ℃.
Comparative example 1
The formula of the slurry (the dosage parts of the components are parts by weight) is as follows:
the cement-based mortar comprises, by weight, 10 parts of fly ash, 3 parts of calcium formate, 4 parts of sodium chloride, 0.06 part of lithium carbonate and 100 parts of water, wherein the 90 parts of cement are taken as a reference.
The preparation method of the slurry comprises the following steps:
1) according to the weight parts in the formula given above, placing water, sodium chloride, calcium formate and lithium carbonate in a slurry stirrer, and uniformly stirring for 50s to obtain a mixture i;
2) adding the cement and the fly ash into the mixture i obtained in the step 1) respectively according to the weight parts in the formula, stirring while adding, completing the adding within 30s, and uniformly stirring for 90-120s to obtain the slurry.
Tests show that the prepared slurry has the viscosity of 1.3 pas, the setting rate of 78%, the initial setting time of 12.5h under the low-temperature environment of 3 ℃, the final setting time of 16.5h under the low-temperature environment of 3 ℃, the 7d compressive strength of 17MPa, the 14d compressive strength of 22.5MPa and the 28d compressive strength of 31MPa under the low-temperature environment of 3 ℃.
Comparative example 2
The formula of the coagulating liquid (the dosage parts of each component are parts by weight) is as follows:
the cement-based bentonite comprises, by weight, 10 parts of fly ash, 7 parts of bentonite mineral component, 4 parts of sodium chloride, 0.06 part of lithium carbonate and 100 parts of water, wherein the 90 parts of cement are taken as a reference.
The preparation method of the coagulated slurry comprises the following steps:
1) according to the weight parts in the formula given above, putting water, bentonite mineral components, sodium chloride and lithium carbonate into a slurry stirrer, and uniformly stirring for 50s to obtain a mixture i;
2) adding the cement and the fly ash into the mixture i obtained in the step 1) respectively according to the weight parts in the formula, stirring while adding, completing the adding within 30s, and uniformly stirring for 90-120s to obtain the coagulating liquid.
Tests show that the prepared slurry has the viscosity of 1.8 pas, the setting rate of 84%, the initial setting time of 16h at the low temperature environment of 3 ℃, the final setting time of 24h at the low temperature environment of 3 ℃, the 7d compressive strength of 12MPa, the 14d compressive strength of 17MPa and the 28d compressive strength of 27MPa at the low temperature environment of 3 ℃.
Comparative example 3
The formula of the slurry (the dosage parts of the components are parts by weight) is as follows:
based on 90 parts of cement, 10 parts of fly ash, 7 parts of bentonite mineral component, 2 parts of calcium formate, 0.06 part of lithium carbonate and 100 parts of water.
The preparation method of the slurry comprises the following steps:
1) according to the weight parts in the formula given above, putting water, bentonite mineral components, calcium formate and lithium carbonate into a slurry stirrer, and uniformly stirring for 50s to obtain a mixture i;
2) adding the cement and the fly ash into the mixture i obtained in the step 1) respectively according to the weight parts in the formula, stirring while adding, completing the adding within 30s, and uniformly stirring for 90-120s to obtain the slurry.
Tests show that the prepared slurry has the viscosity of 1.8 pas, the setting rate of 83 percent, the initial setting time of 15.5h under the low-temperature environment of 3 ℃, the final setting time of 23h under the low-temperature environment of 3 ℃, the 7d compressive strength of 12MPa, the 14d compressive strength of 16MPa and the 28d compressive strength of 24MPa under the low-temperature environment of 3 ℃.
The slurry obtained in each example has high pumpability, good fluidity, short setting time, high initial strength and high setting rate. The slurry prepared by the invention has better effects on anchoring of anchor rods and anchor cables of side slope landslide in low temperature environment (for example, 0-5 ℃), deformation and reinforcement of a shaft permafrost layer, unfreezing and water plugging of a freezing section and the like.
In addition, the grout obtained by the invention has good practical performance and obvious effect, and can replace the application of the traditional grouting grout in slope landslide anchoring section, shaft deformation damage reinforcement and freezing section unfreezing seepage-proofing and water plugging construction in a low-temperature environment.
In comparative example 1, no bentonite mineral component was added, and in the case where the remaining components and the amounts thereof were the same as in example 2, the viscosity and setting percentage of the resulting slurry were decreased; under the condition of not changing other parameters, the addition of the bentonite can improve the setting percentage and the impermeability, and the improvement effect is obvious for grouting engineering. The early strength and low temperature resistance of the resulting slurry are also deteriorated as compared with example 2 without adding calcium formate, sodium chloride and/or lithium carbonate to the formulation, which improves the early strength and low temperature resistance of the resulting slurry, and is disadvantageous for the use of the grouting slurry in a low temperature environment, as in the experimental results of comparative examples 2 to 3.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the spirit of the invention.
Claims (9)
1. The low-temperature-resistant early-strength quick-setting slurry is characterized by comprising a material A and a material B;
the material A comprises the following components:
80-100 parts of cement, namely cement,
10-20 parts of fly ash;
the material B comprises the following components:
the dosage of each component of the material A and the material B is parts by weight, and the parts by weight of the cement is taken as a reference;
wherein the low temperature resistant temperature of the low temperature resistant early strength quick setting slurry is 0-5 ℃.
2. The low temperature resistant early strength rapid setting slurry of claim 1, wherein the slurry comprises a material A and a material B;
the material A comprises the following components:
80-100 parts of cement, namely cement,
10-20 parts of fly ash;
the material B comprises the following components:
the dosage of each component of the material A and the material B is parts by weight, and the parts by weight of the cement is taken as a reference;
wherein the low temperature resistant temperature of the low temperature resistant early strength quick setting slurry is 0-5 ℃.
3. The low temperature resistant early strength rapid setting slurry of claim 1, wherein the slurry is composed of a material A and a material B;
the material A comprises the following components:
80-100 parts of cement, namely cement,
10-20 parts of fly ash;
the material B comprises the following components:
the dosage of each component of the material A and the material B is parts by weight, and the parts by weight of the cement is taken as a reference;
wherein the low temperature resistant temperature of the low temperature resistant early strength quick setting slurry is 0-5 ℃.
4. The low temperature resistant early strength rapid setting slurry of claim 1, wherein the slurry is composed of a material A and a material B;
the material A comprises the following components:
80-100 parts of cement, namely cement,
10-20 parts of fly ash;
the material B comprises the following components:
the dosage of each component of the material A and the material B is parts by weight, and the parts by weight of the cement is taken as a reference;
wherein the low temperature resistant temperature of the low temperature resistant early strength quick setting slurry is 0-5 ℃.
5. The low temperature resistant early strength quick setting slurry of any of claims 1-4, wherein the cement is ordinary portland cement of PO 42.5.
6. The low temperature resistant early strength rapid setting slurry of any of claims 1-4, wherein the fly ash is class II and above power plant dry ash.
7. The low temperature resistant early strength rapid setting slurry of any of claims 1-4, wherein the bentonite mineral constituent comprises 85% -98% montmorillonite;
the bentonite mineral component preferably has a particle size of 200 mesh.
8. The low temperature resistant early strength fast setting slurry of any of claims 1-4, wherein the calcium formate is analytically pure 99% and above C2H2O4Ca; and/or
The sodium chloride is NaCl with analytical purity of 99% or more; and/or
The lithium carbonate is Li with the analytical purity of 99 percent or more2CO3。
9. A method for preparing a low temperature resistant early strength fast setting slurry as claimed in any one of claims 1 to 8, comprising the steps of:
1) according to the parts by weight, the bentonite mineral component, calcium formate, sodium chloride, lithium carbonate and water are contacted and mixed, and the mixture is uniformly stirred to obtain a mixture i;
2) contacting and mixing cement and fly ash with the mixture i obtained in the step 1) according to the dosage parts, and uniformly stirring for 90-120s to obtain the low-temperature-resistant early-strength quick-setting slurry.
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