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 PDF

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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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free liquid
strength
alkali
liquid accelerator
organic
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CN108996943A (en
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滕文生
吴天淳
王虎生
贾维龙
袁慧莉
贾虎琛
贺晓红
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Sichuan Hozo Building Material Co ltd
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039Premixtures of ingredients
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/10Accelerators; Activators
    • C04B2103/12Set accelerators

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  • 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

Anti-permeability high-strength alkali-free liquid accelerator and preparation method thereof
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:
Figure BDA0001751675440000051
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:
Figure BDA0001751675440000052
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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