CN108996943B - Anti-permeability high-strength alkali-free liquid accelerator and preparation method thereof - Google Patents
Anti-permeability high-strength alkali-free liquid accelerator and preparation method thereof Download PDFInfo
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- CN108996943B CN108996943B CN201810869113.3A CN201810869113A CN108996943B CN 108996943 B CN108996943 B CN 108996943B CN 201810869113 A CN201810869113 A CN 201810869113A CN 108996943 B CN108996943 B CN 108996943B
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- 239000007788 liquid Substances 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 230000003487 anti-permeability effect Effects 0.000 title claims abstract description 14
- 239000003607 modifier Substances 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims abstract description 19
- 229910017053 inorganic salt Inorganic materials 0.000 claims abstract description 15
- 150000007522 mineralic acids Chemical class 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 239000003381 stabilizer Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims description 35
- -1 alcohol amine Chemical class 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 14
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 12
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 12
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 12
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 12
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 12
- 229920002401 polyacrylamide Polymers 0.000 claims description 12
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 12
- 239000000391 magnesium silicate Substances 0.000 claims description 11
- 229910052919 magnesium silicate Inorganic materials 0.000 claims description 11
- 235000019792 magnesium silicate Nutrition 0.000 claims description 11
- ZADYMNAVLSWLEQ-UHFFFAOYSA-N magnesium;oxygen(2-);silicon(4+) Chemical compound [O-2].[O-2].[O-2].[Mg+2].[Si+4] ZADYMNAVLSWLEQ-UHFFFAOYSA-N 0.000 claims description 11
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 10
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 6
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 6
- 239000011775 sodium fluoride Substances 0.000 claims description 6
- 235000013024 sodium fluoride Nutrition 0.000 claims description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 5
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 5
- 239000011777 magnesium Substances 0.000 claims description 5
- 229910052749 magnesium Inorganic materials 0.000 claims description 5
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 4
- SLINHMUFWFWBMU-UHFFFAOYSA-N Triisopropanolamine Chemical compound CC(O)CN(CC(C)O)CC(C)O SLINHMUFWFWBMU-UHFFFAOYSA-N 0.000 claims description 4
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims description 4
- 229940043237 diethanolamine Drugs 0.000 claims description 4
- 229960004418 trolamine Drugs 0.000 claims description 4
- 239000004568 cement Substances 0.000 abstract description 13
- 238000010276 construction Methods 0.000 abstract description 9
- 239000000428 dust Substances 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 239000004567 concrete Substances 0.000 description 14
- 239000000243 solution Substances 0.000 description 11
- 239000011378 shotcrete Substances 0.000 description 10
- 239000000047 product Substances 0.000 description 9
- 238000012360 testing method Methods 0.000 description 7
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 6
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
- 239000003513 alkali Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- DGVMNQYBHPSIJS-UHFFFAOYSA-N dimagnesium;2,2,6,6-tetraoxido-1,3,5,7-tetraoxa-2,4,6-trisilaspiro[3.3]heptane;hydrate Chemical compound O.[Mg+2].[Mg+2].O1[Si]([O-])([O-])O[Si]21O[Si]([O-])([O-])O2 DGVMNQYBHPSIJS-UHFFFAOYSA-N 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 235000006408 oxalic acid Nutrition 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 206010003549 asthenia Diseases 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Classifications
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/10—Accelerators; Activators
- C04B2103/12—Set accelerators
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses an impervious high-strength alkali-free liquid accelerator which comprises, by weight, 40-60% of aluminum sulfate, 3-16% of inorganic salt, 0.1-0.5% of inorganic acid, 0.3-0.9% of a stabilizer, 3-8% of an organic modifier and water; it also discloses a preparation method of the anti-permeability high-strength alkali-free liquid accelerator. The invention has the beneficial effects that: the high rebound rate and dust concentration in the construction process are reduced, the product performance is improved, the adaptability to different cements is good, the mixing amount is low, the early strength is high, and the later strength is not lost or even increased basically.
Description
Technical Field
The invention relates to an anti-permeability high-strength alkali-free liquid accelerator and a preparation method thereof.
Background
The accelerator is widely applied nowadays, and can be used for the construction, leakage prevention and plugging of projects such as highways, railways, bridges, tunnels, mines, roadways, national defense, water conservancy, urban construction, spray anchor support and the like, the rapid construction of ground concrete, the emergency rescue of concrete, the reinforcement project and the like. The widely applied liquid accelerator in China is an aluminate accelerator, and although the defects of large dust, insufficient dispersion of a powdery accelerator in a mixture and the like in the dry-sprayed concrete construction process are overcome by the accelerator, the accelerator also has some problems: (1) the later strength of the sprayed concrete is greatly reduced. The excessive alkali content of the alkali accelerator can cause the later strength of the concrete to be reduced due to alkali aggregate reaction, the strength loss of 30-50 percent in 28 days can cause the concrete to crack, and the impermeability grade is reduced. Some accelerators also contain chlorine, which when used for spraying can cause corrosion of the support such as steel reinforcement. (2) Poor stability, short storage period, easy generation of precipitate, inconvenient long-time storage and long-distance transportation; (3) the adaptability with cement is poor. The cement production enterprises in China are very many, the raw materials for producing cement in each enterprise are different, the mineral components are far from each other, and the poor adaptability of the accelerator and the cement can greatly restrict the popularization of the accelerator product and influence the market value of the accelerator product; (4) the early or later strength is low, and some can not even meet the index requirement specified in the national standard JC 477-2005.
In addition, the effect of the accelerator for reducing the rebound amount of the sprayed concrete and reducing the construction dust is still to be improved. The alkali-free setting accelerators developed so far still have problems in this respect during the construction process. The high rebound rate causes excessive concrete to fall off, and the repeated utilization rate of the falling concrete is low, so that a large amount of waste is caused; the high dust concentration during the spraying operation not only affects the safety of the operation, but also pollutes the environment around the construction area and brings adverse effects on the health of workers.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an anti-permeability high-strength alkali-free liquid accelerator which has the advantages of reducing higher rebound rate and dust concentration in the construction process, improving the performance stability of products, having good adaptability to different cements, low doping amount, high early strength and basically no loss or even increase of later strength, and a preparation method thereof.
The purpose of the invention is realized by the following technical scheme: an impervious high-strength alkali-free liquid accelerator comprises, by weight, 40-60% of aluminum sulfate, 3-16% of inorganic salt, 0.1-0.5% of inorganic acid, 0.3-0.9% of a stabilizer, 3-8% of an organic modifier and water.
The inorganic salt is any one or more of magnesium sulfate, magnesium fluosilicate or sodium fluoride.
The inorganic acid is one or more of citric acid, sulfuric acid, phosphoric acid or oxalic acid.
The stabilizing agent is hydrous magnesium silicate.
The organic modifier consists of an organic early strength agent and an organic tackifier.
The organic early strength agent is alcohol amine, and the alcohol amine is at least one or more of diethanol amine, triethanol amine or triisopropanol amine.
The organic tackifier consists of hydroxypropyl methyl cellulose and polyacrylamide.
The preparation method of the anti-permeability high-strength alkali-free liquid accelerator comprises the following steps:
s1, preparation of an organic modifier: under the stirring state, mixing alcohol amine, hydroxypropyl methyl cellulose and polyacrylamide according to the weight ratio of 10: 0.25: 1, adding the mixture into a container filled with water, heating to 40-50 ℃, and continuing stirring for 30-60 min until all components are completely dissolved, thereby preparing the organic modifier;
s2, adding hydrous magnesium silicate and inorganic salt into a vessel containing water under a stirring state, adding aluminum sulfate into the vessel after the hydrous magnesium silicate and the inorganic salt are completely dissolved, heating to 70-80 ℃, preserving heat for 1-2 hours, adding inorganic acid after the aluminum sulfate is completely dissolved, and continuously stirring for 10-12 min to obtain a uniform and stable solution;
and S3, adding the organic modifier prepared in the step S1 into a vessel under a stirring state, preserving heat for 30-40 min, cooling, naturally cooling, and finally preparing a finished product, namely the anti-permeability high-strength alkali-free liquid accelerator.
The invention has the following advantages:
1. the alkali-free accelerator prepared by the invention has no alkali, no chlorine, no pungent smell and no corrosion to human body, and greatly reduces the damage effect on concrete caused by the introduction of alkaline substances, such as alkali aggregate reaction; meanwhile, the corrosion-free effect of alkaline substances on the steel bars is avoided.
2. The mixing amount is low, the setting time is fast, the standard requirement of JC477-2005 accelerating agent for sprayed concrete can be met under the mixing amount of 5 percent, and the first-grade requirement can be met under the mixing amount of 6 percent;
3. the early and later strength is high, the 1d strength of the cement mortar exceeds more than 15MPa, the 28d compressive strength ratio is more than 100%, and the alkali-free setting accelerator contains a tackifying component, so that the dust concentration and the rebound rate can be reduced in the spraying process, the body health of constructors is protected, and the waste of materials is reduced. The sprayed concrete has low rebound rate and excellent impermeability.
Detailed Description
The present invention is further described below, and the scope of protection of the present invention is not limited to the following:
an impervious high-strength alkali-free liquid accelerator comprises, by weight, 40-60% of aluminum sulfate, 3-16% of inorganic salt, 0.1-0.5% of inorganic acid, 0.3-0.9% of a stabilizer, 3-8% of an organic modifier and water.
The inorganic salt is one or more of magnesium sulfate, magnesium fluosilicate or sodium fluoride, the magnesium sulfate can improve the early strength of the concrete, reduce the later strength loss, and the fluoride can shorten the final setting time, promote the formation of a hydration complex and improve the shear strength of the concrete and the binding power of reinforcing steel bars.
The inorganic acid is one or more of citric acid, sulfuric acid, phosphoric acid or oxalic acid, can adjust the acidity of the solution, and simultaneously plays a role in keeping the solution stable.
The stabilizing agent is hydrated magnesium silicate which has the performance of fiber and plays roles of thickening and preventing sedimentation.
The organic modifier consists of an organic early strength agent and an organic tackifier.
The organic early strength agent is alcohol amine, and the alcohol amine is at least one or more of diethanol amine, triethanol amine or triisopropanol amine. The main function of the alcohol amine is to promote the development of the early strength of the concrete, and the alcohol amine can also generate a water-soluble complex with aluminum ions in a solution to improve the solubility of aluminum sulfate.
The organic tackifier consists of hydroxypropyl methyl cellulose and polyacrylamide, and the hydroxypropyl methyl cellulose and the polyacrylamide have the functions of water retention, thickening and permeability resistance, can improve the concrete structure to realize the early high strength of concrete, can obviously improve the cohesiveness of sprayed concrete mixture, and reduces dust and resilience generated during spraying.
The preparation method of the anti-permeability high-strength alkali-free liquid accelerator comprises the following steps:
s1, preparation of an organic modifier: under the stirring state, mixing alcohol amine, hydroxypropyl methyl cellulose and polyacrylamide according to the weight ratio of 10: 0.25: 1, adding the mixture into a container filled with water, heating to 40-50 ℃, and continuing stirring for 30-60 min until all components are completely dissolved, thereby preparing the organic modifier;
s2, adding hydrous magnesium silicate and inorganic salt into a vessel containing water under a stirring state, adding aluminum sulfate into the vessel after the hydrous magnesium silicate and the inorganic salt are completely dissolved, heating to 70-80 ℃, preserving heat for 1-2 hours, adding inorganic acid after the aluminum sulfate is completely dissolved, and continuously stirring for 10-12 min to obtain a uniform and stable solution;
and S3, adding the organic modifier prepared in the step S1 into a vessel under a stirring state, preserving heat for 30-40 min, cooling, naturally cooling, and finally preparing a finished product, namely the anti-permeability high-strength alkali-free liquid accelerator.
Example one
The preparation method of the anti-permeability high-strength alkali-free liquid accelerator comprises the following steps:
s1, preparation of an organic modifier: adding 4 parts of diethanolamine, 0.1 part of hydroxypropyl methylcellulose and 0.4 part of polyacrylamide into a container filled with 8 parts of water under the stirring state, heating to 40-50 ℃, and continuing stirring for 30-60 min until all the components are completely dissolved;
s2, adding 0.5 part of magnesium silicate hydrate, 8 parts of sodium fluoride and 1 part of magnesium fluosilicate into water filled with 27.8 parts of vessels under the stirring state, adding 50 parts of aluminum sulfate after the magnesium silicate hydrate, the sodium fluoride and the magnesium fluosilicate are completely dissolved, heating to 70-80 ℃, preserving heat for 1-2 hours, adding 0.2 part of sulfuric acid after the aluminum sulfate is completely dissolved, and continuously stirring for 10-12 min to obtain a uniform and stable solution;
and S3, adding the modifier into the solution under the stirring state, preserving the heat for 30-40 min, cooling, and naturally cooling to finally obtain a finished product.
Example two:
the preparation method of the anti-permeability high-strength alkali-free liquid accelerator comprises the following steps:
s1, preparation of an organic modifier: adding 4 parts of triethanolamine, 0.1 part of hydroxypropyl methylcellulose and 0.4 part of polyacrylamide into a container filled with 8 parts of water under the stirring state, heating to 40-50 ℃, and continuing stirring for 30-60 min until all the components are completely dissolved;
s2, adding 0.6 part of magnesium silicate hydrate and 10 parts of magnesium sulfate into a vessel containing 21.7 parts of water under stirring, adding 55 parts of aluminum sulfate after complete dissolution, heating to 70-80 ℃, preserving heat for 1h, adding 0.2 part of phosphoric acid after complete dissolution of aluminum sulfate, and continuing stirring for 10-12 min to obtain a uniform and stable solution;
and S3, adding the modifier into the solution under the stirring state, preserving the heat for 30-40 min, cooling, and naturally cooling to finally obtain a finished product.
Example three:
the preparation method of the anti-permeability high-strength alkali-free liquid accelerator comprises the following steps:
s1, preparation of an organic modifier: adding 4 parts of triisopropanolamine, 0.1 part of hydroxypropyl methylcellulose and 0.4 part of polyacrylamide into a container of 8 parts of water under the stirring state, heating to 40-50 ℃, and continuing stirring for 30-60 min until all components are completely dissolved;
s2, adding 0.4 part of magnesium silicate hydrate, 5 parts of sodium fluoride and 7 parts of magnesium sulfate into a vessel containing 29.9 parts of water under the stirring state, adding 45 parts of aluminum sulfate after complete dissolution, heating to 70-80 ℃, preserving heat for 1-2 hours, adding 0.2 part of phosphoric acid after complete dissolution of the aluminum sulfate, and continuing stirring for 10-12 min to obtain a uniform and stable solution;
and S3, adding the modifier into the solution under the stirring state, preserving the heat for 30-40 min, cooling, and naturally cooling to finally obtain a finished product.
And (3) carrying out a cement paste setting time test according to the requirements of the industry standard of national JC477-2005 accelerator for sprayed concrete:
e, Nyung P.O42.5 cement: 400g of the total weight of the mixture is 400g,
water: 160g
Testing the strength of the mortar:
e, Nyung P.O42.5 cement: the weight of the mixture is 900g,
standard sand: the number of the magnetic particles is 1350g,
water: 450g
The accelerator is added according to the weight of 5% and 6% of the cement, and the water in the liquid accelerator is subtracted from the water consumption. A set of blanks were added to the strength test to test the 28-day compressive strength ratio of the cement mortars incorporating the accelerator samples, with the results shown in the following table:
as can be seen from the above table, the alkali-free liquid accelerator prepared by the invention can meet the JC477-2005 accelerating agent for sprayed concrete industry standard at 5% of the doping amount, the 6% of the doping amount can basically meet the first-class requirement, the 1-day strength of the mortar is up to more than 15MPa, and the 28-day compressive strength is not lost.
To examine the suitability of the alkali-free setting accelerator prepared according to the present invention for various types and brands of cement, samples prepared in example 2 were selected for setting time and mortar strength tests according to JC477-2005 "setting accelerator for shotcrete", and the test results were as follows:
as can be seen from the above table, the alkali-free accelerator prepared by the invention can enable different brands and different types of cement to meet the requirements of JC477-2005 Accelerator for sprayed concrete on the industrial standard at 5% of the doping amount, and the 6% of the doping amount can meet the requirements of first-class products, and meanwhile, the alkali-free accelerator has higher early and later strength and good cement adaptability.
The alkali-free accelerator prepared by the invention is stable in state, can be stored for a long time at 0-40 ℃, and does not generate layered precipitation after being placed for 6 months. In a field injection test, the injection concrete has excellent impermeability and low rebound rate, the rebound rate of the side wall is less than or equal to 5 percent, the rebound rate of the arch part is less than or equal to 10 percent, and the injection concrete has good application effect.
Claims (3)
1. An impervious high-strength alkali-free liquid accelerator is characterized in that: an impervious high-strength alkali-free liquid accelerator consists of 40-60 wt% of aluminum sulfate, 3-16 wt% of inorganic salt, 0.1-0.5 wt% of inorganic acid, 0.3-0.9 wt% of stabilizer, 3-8 wt% of organic modifier and water; the organic modifier consists of an organic early strength agent and an organic tackifier; the organic tackifier consists of hydroxypropyl methyl cellulose and polyacrylamide; the organic early strength agent is alcohol amine, and the alcohol amine is at least one or more of diethanol amine, triethanol amine or triisopropanol amine; in the organic modifier, the weight ratio of the alcohol amine to the hydroxypropyl methyl cellulose to the polyacrylamide is 10: 0.25: 1;
the inorganic acid is sulfuric acid or phosphoric acid;
the stabilizing agent is hydrated magnesium silicate;
the anti-seepage high-strength alkali-free liquid accelerator is prepared by the following steps:
s1, preparation of an organic modifier: under the stirring state, mixing alcohol amine, hydroxypropyl methyl cellulose and polyacrylamide according to the weight ratio of 10: 0.25: 1, adding the mixture into a container filled with water, heating to 40-50 ℃, and continuing stirring for 30-60 min until all components are completely dissolved, thereby preparing the organic modifier;
s2, adding hydrous magnesium silicate and inorganic salt into a vessel containing water under a stirring state, adding aluminum sulfate into the vessel after the hydrous magnesium silicate and the inorganic salt are completely dissolved, heating to 70-80 ℃, preserving heat for 1-2 hours, adding inorganic acid after the aluminum sulfate is completely dissolved, and continuously stirring for 10-12 min to obtain a uniform and stable solution;
and S3, adding the organic modifier prepared in the step S1 into a vessel under a stirring state, preserving heat for 30-40 min, cooling, naturally cooling, and finally preparing a finished product, namely the anti-permeability high-strength alkali-free liquid accelerator.
2. The alkali-free liquid accelerator of claim 1, wherein: the inorganic salt is any one or more of magnesium sulfate, magnesium fluosilicate or sodium fluoride.
3. The method for preparing the alkali-free liquid accelerator of claim 1 or 2, which comprises the steps of:
s1, preparation of an organic modifier: under the stirring state, mixing alcohol amine, hydroxypropyl methyl cellulose and polyacrylamide according to the weight ratio of 10: 0.25: 1, adding the mixture into a container filled with water, heating to 40-50 ℃, and continuing stirring for 30-60 min until all components are completely dissolved, thereby preparing the organic modifier;
s2, adding hydrous magnesium silicate and inorganic salt into a vessel containing water under a stirring state, adding aluminum sulfate into the vessel after the hydrous magnesium silicate and the inorganic salt are completely dissolved, heating to 70-80 ℃, preserving heat for 1-2 hours, adding inorganic acid after the aluminum sulfate is completely dissolved, and continuously stirring for 10-12 min to obtain a uniform and stable solution;
and S3, adding the organic modifier prepared in the step S1 into a vessel under a stirring state, preserving heat for 30-40 min, cooling, naturally cooling, and finally preparing a finished product, namely the anti-permeability high-strength alkali-free liquid accelerator.
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| CN109650761A (en) * | 2018-12-17 | 2019-04-19 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | A kind of alkali-free liquid setting accelerator and its preparation and application |
| CN111377651B (en) * | 2018-12-29 | 2022-04-22 | 江苏苏博特新材料股份有限公司 | Low-alkali liquid accelerator containing microbial polysaccharide and preparation method thereof |
| CN109896771B (en) * | 2019-04-25 | 2021-03-02 | 杨炎轶 | Alkali-free liquid accelerator and preparation method thereof |
| CN110395939B (en) * | 2019-06-19 | 2022-04-22 | 科之杰新材料集团有限公司 | Waterproof enhanced alkali-free liquid accelerator and preparation method thereof |
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