CN106082763A - A kind of alkali-free liquid accelerating agent and its preparation method and application method - Google Patents
A kind of alkali-free liquid accelerating agent and its preparation method and application method Download PDFInfo
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- CN106082763A CN106082763A CN201610412483.5A CN201610412483A CN106082763A CN 106082763 A CN106082763 A CN 106082763A CN 201610412483 A CN201610412483 A CN 201610412483A CN 106082763 A CN106082763 A CN 106082763A
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- alkali
- free liquid
- accelerating agent
- liquid accelerating
- accelerator
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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
- 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
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/10—Accelerators; Activators
- C04B2103/12—Set 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)
Abstract
The invention discloses a kind of alkali-free liquid accelerating agent and its preparation method and application method, formulated according to percentage by weight by following component: aluminum sulfate 35%～60%, aluminium hydroxide 2%～8%, hydramine 1%～5%, dispersant 0.5%～1%, stabilizer 0.1%～0.5%, surplus is water.The accelerator of the present invention is neutrality, can be prevented effectively from the alkali-aggregate reaction in later stage, stops to produce potential safety hazard；The superior performance while that volume being low, first, final setting time, later strength are all significantly larger than the related specifications regulation for accelerator Grade A；Mixing during this accelerator carries out construction of shotcrete, springback capacity is little, and dust concentration is low, can be workmen's operating environment of providing a safety and Health, reduce construction costs, accelerating construction progress simultaneously, have good economic and social benefit.
Description
Technical field
The present invention relates to sprayed concrete of substructure work construction field, be specifically related to a kind of alkali-free liquid accelerating agent and system thereof
Preparation Method and methods for using them.
Background technology
Gunite concrete is as a kind of supporting means, and the application in underground engineering construction is more and more universal, and accelerator is made
For important additive a kind of in gunite concrete, its research just receives more and more attention, but accelerator on the market is deposited
In bigger drawback.
For Mu Qian, shotcrete accelerator includes powder accelerator and liquid accelerating agent two types, and its drawback is such as
Under:
(1) accelerator is alkalescence, and after mixing in gunite concrete, the later stage can occur alkali-aggregate reaction, generates alkali-silica
, there is bigger volumetric expansion in gel, causes concrete spalling phenomenon after water suction；
(2) all there is the problem that volume is big, particularly powder accelerator due to it admittedly in powder accelerator and liquid accelerating agent
The states of matter of state powdery causes mix uneven, brings the problem that volume is big, causes construction cost to increase；
(3) relatively big on sprayed concrete strength impact, owing to accelerator volume causes greatly late strength of concrete decay width
Degree is big, brings certain potential safety hazard for engineering；
(4) due to accelerator, to mix springback capacity during uneven and performance issue causes construction of shotcrete big, powder
Dirt is many, and Construction Cost increases, and construction environment is extremely severe, has a strong impact on the health of workmen；
(5) accelerator promotes the aquation of cement C3S by adding alkali salt, in order to weaken the alkalescence of accelerator
Add hydroxy carboxylic acid again, but, there is cross reaction the most in the solution in alkali salt and hydroxy carboxylic acid, be easily generated crystallization,
Precipitations etc., affect rapid hardening effect.
Summary of the invention
It is an object of the invention to overcome existing accelerator is that alkalescence causes that alkali-aggregate reaction, volume are big, dust is many, resilience
Big problem, it is provided that a kind of alkali-free liquid accelerating agent and its preparation method and application method, this accelerator pH most about 7, mixes
Amount less, superior performance.
For achieving the above object, the present invention adopts the following technical scheme that
A kind of alkali-free liquid accelerating agent, formulated according to percentage by weight by following component: aluminum sulfate 35%～60%,
Aluminium hydroxide 2%～8%, hydramine 1%～5%, dispersant 0.5%～1%, stabilizer 0.1%～0.5%, surplus is water.
It is aluminium salt, i.e. aluminum sulfate and active aluminium hydroxide etc. that this alkali-free liquid accelerating agent acts primarily as the composition of rapid hardening effect,
Aluminium salt is reacted with the main mineral constituent in cement, accelerates its aquation, hardening, thus reaches the purpose of rapid hardening.This alkali-free
As long as liquid accelerating agent can be effectively improved aluminum ions concentration and stability in solution, it is not necessary to add alkali salt and
Hydroxy carboxylic acid, it is to avoid alkali salt and hydroxy carboxylic acid occur crystallization, the precipitation etc. that cross reaction causes in the solution, improve speed
Solidifying effect.
The alkali-free liquid accelerating agent aluminum sulfate content of the present invention is 35%～60%, and aluminium hydroxide content is 2%～8%,
The aluminium ion concentration that improve in solution as much as possible, hydramine and the interpolation of stabilizer, improve aluminum sulfate and aluminium hydroxide
Dissolubility so that it is sufficiently dissolve, reaction, improve the aluminium ion concentration in solution.Meanwhile, hydramine also acts early strength agent
Effect, can improve the early strength of concrete, accelerates setting time.
Described aluminum sulfate is technical grade aluminum sulfate, and its alumina content must not be less than 15.6%, and ferric oxide content is not
Must be higher than 0.5%, powder or bulk.Aluminum sulfate purity is high, fineness is little, soluble, can improve aluminum sulfate when reaction
Dissolubility, reduce the impurity impact on solution.
Described aluminium hydroxide is technical grade aluminium hydroxide, and its alumina content must not be less than 63.5%, and water content must not be high
In 0.3%, in powder.Same, aluminium hydroxide also has purity height, fineness feature little, diffluent, aluminum sulfate and hydrogen-oxygen
Change aluminum dissolubility when reaction high, improve the aluminum ions concentration in solution, thus improve rapid hardening effect.
Described hydramine be in monoethanolamine, diethanolamine, triethanolamine, triisopropanolamine one or more by arbitrarily than
Example mixes.
Preferably, described hydramine is diethanolamine, triisopropanolamine or diethanolamine and triethanolamine mixes in any proportion
The mixture closed.
Described dispersant can use polyethylene glycol 200 or PEG400, it is preferred to use polyethylene glycol 200.
Described polyethylene glycol 200 and PEG400 are technical grade Polyethylene Glycol, and moisture must not be higher than 1.0%.
Moisture, below 1.0%, can improve the solid content of solution, improves active constituent content, keeping solution-stabilized not separating out,
On the basis of non-setting, improve active constituent content to greatest extent, use volume it is thus possible to reduce accelerator, improve to condense and imitate
Really.
Described stabilizer is the powdery organic carboxyl acid being highly soluble in water.
The pH value of this accelerator is neutrality.
The present invention solves the technical scheme of its technical problem and also includes: the preparation method of above-mentioned alkali-free liquid accelerating agent, bag
Include following steps:
Step 1: described aluminum sulfate is dissolved in described water, is then heated to 75～85 DEG C；
Step 2: add described aluminium hydroxide, maintains the temperature at 75～85 DEG C the most together during adding described aluminium hydroxide
Time be stirred continuously；
Step 3: after described aluminum sulfate and described aluminium hydroxide are dissolved in the water, stops heating, and is cooled to room temperature；
Step 4: be sequentially added into hydramine, dispersant and stabilizer, be stirred continuously simultaneously, until forming transparent stable homogeneous
Liquid, obtains pH value in neutral accelerator.
This accelerator pH value is about 7, for non-alkaline liquid accelerating agent.
The present invention solves the technical scheme of its technical problem and also includes: the application process of above-mentioned alkali-free liquid accelerating agent, will
Alkali-free liquid accelerating agent joins in jet cement compositions at nozzle, prepares gunite concrete, and consumption is coagulation soil water
The 2.0%～4.0% of mud weight, volume is low.
The method have the advantages that
1, in product component, after aluminium hydroxide is hydrolyzed, its aqueous solution is alkalescence, and aqueous solution after aluminum sulfate hydrolysis
In faintly acid, being therefore non-alkaline without add other acid again realizing solution in addition to stabilizer, composition is simple,
Preparation is convenient, can be prevented effectively from the construction later stage alkali-aggregate reaction that existing alkalescence accelerator causes, it is ensured that the safety of structure can
Lean on.
2, in the accelerator of the present invention, aluminum sulfate content is about 10 times of aluminium hydroxide content, after aluminum sulfate hydrolysis
Aqueous solution is faintly acid, both ensure that the abundant of aluminium composition in solution, promotes rapid hardening effect, reduces volume, ensures that
Accelerator solution is non-alkaline.
3, this accelerator superior performance, coagulant effect is obvious, and presetting period and final setting time are all significantly larger than specification regulation,
Hydramine serves the effect of early strength agent, can improve the early strength of concrete, accelerates setting time, and early strength increases fast
Speed；Aluminium salt is reacted with the main mineral constituent in cement, accelerates its aquation, hardening, and later strength attenuation amplitude is little, completely
Meet the requirement for gunite concrete setting time of the various operating mode；At normal temperatures and pressures, under the conditions of a suitable volume,
The accelerator presetting period of the prior art is generally 5min, and final setting time is generally 10min；The accelerator of the present invention with
As a example by the volume of 2.0%, the presetting period 1～2min, final setting time 4～6min, (do not fill speed compared to common gunite concrete
Solidifying agent), 1 day comprcssive strength of this accelerator can improve 100%～150%, and the loss of later stage comprcssive strength is less than 5%, course of injection
Middle dust concentration is low, rebound of shotcrete amount is few, and construction environment is good, and late strength of concrete is high.
4, the alkali-free liquid accelerating agent aluminum sulfate content of the present invention is 35%～60%, aluminium hydroxide content be 2%～
8%, the aluminium ion concentration that improve in solution as much as possible, hydramine and the interpolation of stabilizer, improve aluminum sulfate and hydrogen-oxygen
Change the dissolubility of aluminum so that it is sufficiently dissolve, react, improve the aluminium ion concentration in solution.Need not add tradition accelerator
Alkali salt, it is to avoid there is crystallization, precipitation that cross reaction causes etc. in alkali salt and hydroxy carboxylic acid, carries in the solution
High rapid hardening effect.
5, current, the volume of liquid accelerating agent is typically 8%～about 10%, and the accelerator solid content of the present invention is high, aluminum
Ion concentration is big, and volume only has 2.0%～4.0%, and volume is low, can be substantially reduced construction costs.
6, because of the accelerator that accelerator is liquid of the present invention, and in work progress, concrete springback amount is few, and concrete is fast
Rapid hardening knot hardening, so after mixing this accelerator, in work progress, dust concentration is low, can be workmen provide a safety,
Healthy construction environment；During the spraying of specification, construction space dust concentration is less than 6mg/m3, springback capacity is less than
10%.
7, after mixing this accelerator of proper proportion, in the spraying engineering of specification, rebound of shotcrete amount is low,
Effectively prevent the waste of mix, reduce construction costs.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further described.
Embodiment 1:
A kind of alkali-free liquid accelerating agent, is configured according to percentage by weight by following components:
Aluminum sulfate: 50%；
Aluminium hydroxide: 6%；
Diethanolamine: 3%；
Polyethylene glycol 200: 0.8%；
Stabilizer: 0.3%；
Water: 39.9%.
Preparation method is as follows:
First aluminum sulfate is dissolved in the water, is then heated to 80 DEG C, add aluminium hydroxide and be stirred continuously, at above-mentioned two groups
Tap when closely dissolving, stops heating, and is cooled to room temperature, is sequentially added into diethanolamine, polyethylene glycol 200, steady the most wherein
Determining agent, period is stirred continuously, until the liquid forming transparent stable homogeneous is this efficient alkali-free liquid accelerating agent.
During application, alkali-free liquid accelerating agent is joined in jet cement compositions at nozzle, prepares gunite concrete,
Consumption is in concrete the 2.0% of cement weight.
Embodiment 2:
A kind of alkali-free liquid accelerating agent, is configured according to percentage by weight by following components:
Aluminum sulfate: 38%；
Aluminium hydroxide: 8%；
Triisopropanolamine: 4%；
Polyethylene glycol 200: 0.9%；
Stabilizer: 0.4%；
Water: 48.7%.
Preparation method is as follows:
First aluminum sulfate is dissolved in the water, is then heated to 80 DEG C, add aluminium hydroxide and be stirred continuously, at above-mentioned two groups
Tap when closely dissolving, stops heating, and is cooled to room temperature, be sequentially added into the most wherein triisopropanolamine, polyethylene glycol 200,
Stabilizer, period is stirred continuously, until the liquid forming transparent stable homogeneous is this efficient alkali-free liquid accelerating agent.
During application, alkali-free liquid accelerating agent is joined in jet cement compositions at nozzle, prepares gunite concrete,
Consumption is in concrete the 3.0% of cement weight.
Embodiment 3
A kind of alkali-free liquid accelerating agent, is configured according to percentage by weight by following components:
Aluminum sulfate: 55%；
Aluminium hydroxide: 4%；
Diethanolamine: 2%；
Triethanolamine: 1%；
PEG400: 0.5%；
Stabilizer: 0.1%；
Water: 37.4%.
Preparation method is as follows:
First aluminum sulfate is dissolved in the water, is then heated to 80 DEG C, add aluminium hydroxide and be stirred continuously, at above-mentioned two groups
When tap is closely dissolved, stop heating, and be cooled to room temperature, be sequentially added into diethanolamine, triethanolamine, poly-second two the most wherein
Alcohol 400, stabilizer, period is stirred continuously, until the liquid forming transparent stable homogeneous is this efficient alkali-free liquid accelerating agent.
During application, alkali-free liquid accelerating agent is joined in jet cement compositions at nozzle, prepares gunite concrete,
Consumption is in concrete the 4.0% of cement weight.
Performance test:
Cement paste is carried out according to the requirement of Chinese building material industry standard JC477-2005 " gunite concrete accelerator "
Setting time and strength of cement mortar test, wherein the alkali-free liquid accelerating agent consumption of the present invention presses the percentages of cement weight
Calculate.
Cement paste test setting time:
Lafarge PO.42.5 cement 400g；
Water 160g.
Strength of cement mortar is tested:
Lafarge PO.42.5 cement 900g；
Normal sand 1350g；
Water 450g.
The accelerator of embodiment 1, embodiment 2 and embodiment 3 all mixes in cement slurry according to the 2.0% of cement consumption,
In strength test, the blank mortar not adding any accelerator is made a strength test, in order to test the mortar mixed with accelerator
With its 28 days intensity rates, result of the test is shown in Table 1.
Table 1 result of the test
As it can be seen from table 1 the alkali-free liquid accelerating agent of the present invention is under the volume of 2.0%, it is possible to make cement paste
Meeting the presetting period setting time is not more than 2min, and final setting time is not more than the Grade A performance requirement of 6min, it is possible to make one day
Mortar strength reaches 13.47MPa, the 7MPa required considerably beyond Grade A, it was demonstrated that this accelerator superior performance.
The foregoing is only presently preferred embodiments of the present invention, be not whole embodiments of the present invention, not in order to limit
The present invention processed, all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made, should be included in
Within protection scope of the present invention.
In addition to technical characteristic described in description, remaining technical characteristic is all known to a person skilled in the art technology, in order to prominent
Going out the innovative characteristics of the present invention, above-mentioned technical characteristic does not repeats them here.
Claims (10)
1. an alkali-free liquid accelerating agent, is characterized in that, formulated according to percentage by weight by following component: aluminum sulfate 35%
～60%, aluminium hydroxide 2%～8%, hydramine 1%～5%, dispersant 0.5%～1%, stabilizer 0.1%～0.5%, surplus
For water.
A kind of alkali-free liquid accelerating agent the most according to claim 1, is characterized in that, described hydramine is monoethanolamine, diethyl
One or more in hydramine, triethanolamine, triisopropanolamine mix in any proportion.
A kind of alkali-free liquid accelerating agent the most according to claim 1, is characterized in that, described hydramine is diethanolamine, three different
The mixture that Propanolamine or diethanolamine and triethanolamine mix in any proportion.
A kind of alkali-free liquid accelerating agent the most according to claim 1, is characterized in that, described dispersant is polyethylene glycol 200.
A kind of alkali-free liquid accelerating agent the most according to claim 1, is characterized in that, described dispersant is PEG400.
A kind of alkali-free liquid accelerating agent the most according to claim 1, is characterized in that, in described dispersant, moisture is the highest
In 1.0%.
A kind of alkali-free liquid accelerating agent the most according to claim 1, is characterized in that, in described aluminum sulfate, alumina content is not
Less than 15.6%, ferric oxide content is not higher than 0.5%, in powder or bulk.
A kind of alkali-free liquid accelerating agent the most according to claim 1, is characterized in that, alumina content in described aluminium hydroxide
Being not less than 63.5%, water content is not higher than 0.3%, in powder.
9. the preparation method of the alkali-free liquid accelerating agent described in claim 1～9 any one, is characterized in that, including following step
Rapid:
Step 1: described aluminum sulfate is dissolved in described water, is then heated to 75～85 DEG C；
Step 2: add described aluminium hydroxide, maintains the temperature at 75～85 DEG C the most not during adding described aluminium hydroxide
Disconnected stirring；
Step 3: after described aluminum sulfate and described aluminium hydroxide are dissolved in the water, stops heating, and is cooled to room temperature；
Step 4: be sequentially added into hydramine, dispersant and stabilizer, be stirred continuously simultaneously, until forming the liquid of transparent stable homogeneous
Body, obtains pH value in neutral accelerator.
10. the application process of the alkali-free liquid accelerating agent described in claim 1～9 any one, is characterized in that, by alkali-free liquid
Accelerator joins in jet cement compositions at nozzle, prepares gunite concrete, and consumption is cement weight in concrete
2.0%～4.0%.
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| CN107417155A (en) * | 2017-08-17 | 2017-12-01 | 北京建筑大学 | A kind of alkali-free chlorine-free liquid accelerator and preparation method and application |
| CN107954628A (en) * | 2018-01-19 | 2018-04-24 | 江苏苏博特新材料股份有限公司 | A kind of alkali-free chlorine-free sulfate radical-free liquid accelerator |
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