CN110218019A - Early high-strength compound alkali-free liquid accelerator, preparation method and gunite concrete - Google Patents
Early high-strength compound alkali-free liquid accelerator, preparation method and gunite concrete Download PDFInfo
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- CN110218019A CN110218019A CN201910659832.7A CN201910659832A CN110218019A CN 110218019 A CN110218019 A CN 110218019A CN 201910659832 A CN201910659832 A CN 201910659832A CN 110218019 A CN110218019 A CN 110218019A
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- Prior art keywords
- alkali
- free liquid
- liquid accelerator
- strength compound
- cement
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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
Abstract
This application discloses a kind of early high-strength compound alkali-free liquid accelerator, preparation method and gunite concretes, and the alkali-free liquid accelerator includes following components by weight: aluminum sulfate: 45%~55%；Active aluminium hydroxide: 5%~10%；Fluoride salt: 5%~10%；Hydramine: 1.5%~4%；Polyacrylamide: 0.5%~1%；Organic water-reducing agent: 1%~3%；Stabilizer: 0.8%~1%；Water: 25%~35%.
Description
Technical field
The present disclosure relates generally to building material technical fields, and in particular to a kind of morning high-strength compound alkali-free liquid accelerator,
Preparation method and gunite concrete are mainly used in the gunite concrete of the geotechnical engineerings such as tunnel, mine, side slope.
Background technique
Accelerator is the additive that concrete can be made to condense hardening rapidly, is essential material in gunite concrete,
Its effect is that the rapid hardening of accelerating jetting concrete is hard fastly, increases a jet thickness, reduces rebound loss, prevent concrete because
Gravity is fallen off, and can effectively bond reinforcing bar and arch, forms armored concrete supporting construction.Accelerator is mainly used for anchor
It sprays in the geotechnical engineerings such as supporting, tunnel, mine, deep basal pit, water conservancy, side slope, application is very extensive.
Accelerator is divided into powder accelerator and two kinds of liquid accelerator, wherein it is mixed that powder accelerator is mainly used in dry spray
In solidifying soil, since that there are springback capacities is big, Dust Capacity is big, late strength of concrete loss is big, construction efficiency is low for dry shotcreting
Problem uses gradually decreasing in engineering, in some tunnel specifications, has explicitly indicated that and be forbidden to use dry shotcreting.Liquid
Accelerator is mainly used in wet shotcreting, and wet shotcreting dust is small, construction efficiency is high, concrete strength is high, is being obtained
To the popularization and application of large area.The development of wet shot is inevitable also along with the development of liquid accelerator.
Currently, liquid accelerator has been broadly divided into alkali and alkali-free two types, having alkali liquid quick-setting agent is mainly sodium aluminate
Type, silicic acid sodium form, due to alkaline strong, Yi Fasheng alkali-aggregate reaction, late strength of concrete loss is serious, and alkalinity hurts human body
Evil is big.The advantages that alkali-free liquid accelerator is with its high long-term strength retention, alkali-free chlorine-free, safety and environmental protection and high-durability,
Alkaline liquid accelerating agent is just gradually replaced, the development trend of liquid accelerator is become.
That there are volumes is big (the 7%~12% of cement quality) for existing alkali-free liquid accelerator, material property is single, with not
Same inferior suitability promotees to coagulate effect is low, active ingredients are few and stability is poor, early strength of concrete is low, price is high etc.
Problem, so that the popularization of alkali-free liquid accelerator is extremely difficult.Therefore, it is necessary to further grind to alkali-free liquid accelerator
Hair.
Summary of the invention
In view of drawbacks described above in the prior art or deficiency, be intended to provide a kind of early high-strength compound alkali-free liquid accelerator and
Preparation method.The accelerator can effectively improve solution concentration, substantially reduce accelerator volume, shorten just final setting time, raising
Construction efficiency improves gunite concrete early strength and later strength, has good adaptability from different cement.At the scene
When construction, rebound and dust can be effectively reduced, improve concrete spraying support effect.
In order to achieve the above objects and other related objects, the present invention is achieved through the following technical solutions.
One aspect of the present invention provides a kind of early high-strength compound alkali-free liquid accelerator, and the alkali-free liquid accelerator is by weight
Part includes following components:
Aluminum sulfate 45%~55%；
Active aluminium hydroxide 5%~10%；
Fluoride salt 5%~10%；
Hydramine 1.5%~4%；
Polyacrylamide 0.5%~1%；
Organic water-reducing agent 1%~3%；
Stabilizer 0.8%~1%；
Water 25%~35%.
In some embodiments of the embodiment of the present application, the fluoride salt is in sodium fluoride, potassium fluoride, magnesium fluoride
It is one or more.
In some embodiments of the embodiment of the present application, the hydramine is selected from diethanol amine, triethanolamine, monoethanol
One of amine, dimethylethanolamine, diethyl ethylene diamine, methyl diethanolamine, ethyldiethanolamine or a variety of combinations.
Further, the hydramine includes triethanolamine, and the parts by weight of the triethanolamine are 0.5%~1%.
Further, the hydramine includes diethanol amine, and the parts by weight of the diethanol amine are 1%~3%.
In some embodiments of the embodiment of the present application, organic water-reducing agent is polyethylene glycol type condensation polymer.
In some embodiments of the embodiment of the present application, the stabilizer is hydrated magnesium silicate.
On the other hand the present invention provides a kind of preparation method of early high-strength compound alkali-free liquid accelerator, including following step
It is rapid:
Step 1: fluoride salt, diethanol amine and water being mixed, fluorination salting liquid is obtained；
Step 2: the fluorination salting liquid is heated to 60~70 DEG C, aluminum sulfate, active aluminium hydroxide and stabilizer is added,
High-speed stirred is carried out, alkali-free quick-coagulant mother liquor is obtained；
Step 3: hydramine, polyacrylamide and organic water-reducing agent is added in Xiang Suoshu alkali-free quick-coagulant mother liquor, and temperature control exists
40~60 DEG C, the early high-strength compound alkali-free liquid accelerator is obtained after filtering.
In certain embodiments of the present invention, further include the one or more of following technical characteristic:
A1) in the step 1, sodium fluoride is added to the water at normal temperature, 10~30min is quickly stirred, is then added two
Ethanol amine continues 10~20min of stirring, obtains Fluorinse；
A2) in the step 2, when Fluorinse is heated to 60~70 DEG C, aluminum sulfate and reactive hydrogen are added several times
Aluminium oxide carries out high shear agitation with 500~800rpm/min, and stabilizer is then added, and temperature is controlled at 70 DEG C or so, stirred
Mixing the time is 90~150min, tentatively obtains alkali-free quick-coagulant mother liquor；
A3) in the step 3, alkali-free quick-coagulant mother liquor is compounded, triethanolamine, polyacrylamide and organic is added
Water-reducing agent, at 40~60 DEG C, mixing speed is 300~500rpm/min for temperature control, and the reaction time is 60~90min, is passed through
The early high-strength compound alkali-free liquid accelerator is obtained after filter.
The third aspect, the present invention provide a kind of gunite concrete, and the gunite concrete includes above-mentioned early high-strength compound
Alkali-free liquid accelerator, the volume of the alkali-free liquid accelerator are 3~5% of cement quality in the gunite concrete；
The cement type accommodation coefficient c of the alkali-free liquid acceleratoraLess than 0.8,
Wherein, the test method of the cement type accommodation coefficient are as follows:
Alkali-free liquid accelerator is applied in five kinds of test cement types with 4% volume, for different cement types
The coefficient of dispersion of each sub-indicator is obtained, the sub-indicator includes presetting period index, final setting time index, 1d intensity index
With 28d intensity than index, the accommodation coefficient caFor the sum of the coefficient of dispersion of each sub-indicator.
Method particularly includes:
When alkali-free liquid accelerator is applied to progress cement paste condensation in five kinds of test cement types with 4% volume
Between test, obtain the setting time index of every group of cement slurry, the time index includes that presetting period index and final setting time refer to
Mark, wherein setting time coefficient of dispersion is cνt(ratio of cement paste setting time standard deviation sigma and average value u), is divided into initial set
Time discrete coefficient(ratio of cement paste presetting period standard deviation and presetting period average value) and the discrete system of final setting time
Number(ratio of cement paste final setting time standard deviation and final setting time average value)；
Alkali-free liquid accelerator is applied to progress strength of cement mortar examination in five kinds of test cement types with 4% volume
It tests, obtains the intensity index of every group of cement mortar, the intensity index includes 1d (one day) intensity index and 28d (28 days) intensity
Compare index.The coefficient of dispersion c of 1d intensity indexνsFor the ratio of mortar 1d tension variance and mortar 1d average strength u, 28d
Coefficient of dispersion of the intensity than indexFor mortar 28d intensity ratio standard deviation and mortar 28d intensity than average value ratio.
Then cement type accommodation coefficient isThe coefficient is dimensionless index, is advised meeting
Under the requirement of model, by a large amount of test data, the standard value for obtaining the accommodation coefficient is 0.8.When being less than the numerical value, explanation
Liquid accelerator is good to the adaptability of different cement, can satisfy the adaptability for different cement types；When greater than the numerical value,
Illustrate that liquid accelerator to different inferior suitabilities, can only meet the adaptability to certain brand cement type, and corresponds to
The case where for other brand cement types, then it is unable to satisfy related request.
The test cement type is commercially available reference cement, scenery with hills and waters cement, conch cement, chimera cement and Three Gorges water
Mud.Wherein,
Reference cement: by China Building Material Scientific Research General Institute, Co., Ltd is produced；
Scenery with hills and waters cement: it is produced by Shandong Shanshui Cement Group Ltd.；
Conch cement: by Anhui Conch Cement, limited liability company is produced；
Chimera cement: it is produced by Taiyuan chimera cement limited liability company；
Three Gorges cement: it is produced by Gezhouba Group Cement Co., Ltd..
Morning high-strength compound alkali-free liquid accelerator provided by the embodiments of the present application, by the way that active aluminium hydroxide, energy one is added
The rush for determining the raising accelerator of degree coagulates effect, and active aluminium hydroxide in the solution, is easy to release aluminium ion.And it is living
Property aluminium hydroxide is nontoxic and relatively stable, is not easy to deliquesce, to the corrosion-free effect of reinforcing bar.
Specific embodiment
It is mixed the following detailed description of the early high-strength compound alkali-free liquid accelerator of the embodiment of the present application, preparation method and in injection
Application in solidifying soil construction.
As mentioned in the background, in the prior art, common liquid accelerator is all made of aluminium hydroxide.Aluminum sulfate
Aluminium hydroxide component is added in type liquid accelerator, and since aluminium hydroxide is amphoteric compound, solubility very little, is hydrolyzed in the solution
In the process, enough aluminium ions (aluminium ion is that accelerator promotees solidifying effective ion) cannot be provided.Therefore, aluminium hydroxide is added,
Effect is coagulated to the rush of accelerator and improves very little, or is hardly improved.And reach certain aluminium hydroxide volume, it is molten to reach saturation
When solution is spent, how much aluminium hydroxide, which no matter mixed, all can not improve the solidifying effect of rush, cause the presetting period too long, be unfavorable for spraying coagulation
The construction of soil is easy to collapse, reduces a jetting thickness, influence construction efficiency.
In view of the drawbacks described above of the prior art, the embodiment of the present application first aspect provides a kind of early high-strength compound alkali-free liquid
Accelerator.
The alkali-free liquid accelerator includes following components by weight:
Aluminum sulfate 45%~55%；
Active aluminium hydroxide 5%~10%；
Fluoride salt 5%~10%；
Hydramine 1.5%~4%；
Polyacrylamide 0.5%~1%；
Organic water-reducing agent 1%~3%；
Stabilizer 0.8%~1%；
Water 25%~35%.
In alkali-free liquid accelerator provided by the embodiment of the present application, the fluoride salt is selected from sodium fluoride, potassium fluoride, fluorination
One of magnesium is a variety of.Fluorine ion and sulfate ion in fluoride salt are reacted with calcium ion, consume a large amount of calcium ion,
C3The silicon-rich layer that S (tricalcium silicate) surface hydrolysis is formed is difficult to be formed electric double layer, and the C-S-H (hydrated calcium silicate) generated
C/S (calcium silicon ratio Ca/Si) value is smaller, and moisture can constantly penetrate C-S-H to C3S diffusion, makes C3The induction period of S disappears, to promote
C3The aquation of S.Simultaneously as a large amount of heats of hydration of above-mentioned reaction release, and promote the hydration reaction of each component in cement, it is formed
A large amount of gel of calcium silicate, so that improving accelerator promotees solidifying effect.
In addition, active aluminium hydroxide is mixed in alkali-free liquid accelerator provided by the embodiment of the present application, it can be to a certain degree
Raising accelerator rush coagulate effect, active aluminium hydroxide in the solution, be easy aluminium ion is released.But active hydroxide
The volume of aluminium is more than after certain volume, and to promoting, solidifying effect raising is unobvious, to the rapid hardening decreased effectiveness of accelerator.
If simple replaces with active aluminium hydroxide, due to volume reach it is a certain amount of after, effect is coagulated to the rush of accelerator
Weaken.Therefore, fluoride salt component is added, the fluorine ion in solution can further promote the molten of active aluminium hydroxide and aluminum sulfate
Solution, by the synergistic effect with aluminum sulfate and active aluminium hydroxide, synergistic effect can effectively improve the rapid hardening effect of accelerator,
Reduce accelerator volume (3~5%), shorten setting time (presetting period can control in 2min or so, final setting time 6min with
It is interior), be conducive to the construction of gunite concrete, it is not easy to collapse, a jetting thickness can be improved, improve construction efficiency, significantly
Enhance the effect of accelerator.
In alkali-free liquid accelerator provided by the embodiment of the present application, the hydramine includes triethanolamine, three ethyl alcohol
The parts by weight of amine are 0.5%~1%, and the hydramine includes that the parts by weight of diethanol amine described in diethanol amine are 1%~3%.Its
In, the early strength function of triethanolamine is to promote C3A(3CaO·Al2O3) aquation, quickening form entringite.Triethanolamine point
There is a pair of unshared electronics in son, easily form covalent bond with metal ion, forms stable complex compound, complex compound shape in the solution
At many solvable areas, the diffusion rate of hydrated product is improved, shortens the incubation period in cement hydration process, to improve morning
Phase intensity.
In alkali-free liquid accelerator provided by the embodiment of the present application, organic water-reducing agent is polyethylene glycol type polycondensation
Object.Polyethylene glycol type condensation polymer is a kind of organic diminishing component, can be stabilized, active aluminium hydroxide and polyethylene glycol type polycondensation
The addition of object can improve aluminum ions content in accelerator, can effectively improve the early strength and later strength of concrete, later period
Intensity almost free of losses, or even be improved to some extent, to significantly improve the liquid accelerator to the strong of gunite concrete
Spend performance.Several other water-reducing agents are tested, such as melamine type water-reducing agent, polycarboxylic acid water reducing agent, naphthalene series high-efficiency water-reducing agent etc.,
Respective action is not had after incorporation, or cannot be stabilized in the solution.
In alkali-free liquid accelerator provided by the embodiment of the present application, the stabilizer is hydrated magnesium silicate.For addition
The liquid water-reducing agent of active aluminium hydroxide and polyethylene glycol type condensation polymer, if replacing hydrated magnesium silicate with other stabilizers,
Liquid accelerator cannot be made to achieve the effect that ideal.
The embodiment of the present application second aspect provides a kind of preparation method of early high-strength compound alkali-free liquid accelerator, including with
Lower step:
1. weighing a certain amount of water first, sodium fluoride is added to the water at normal temperature, quickly stirs 10~30min, then
Diethanol amine is added, continues 10~20min of stirring, obtains Fluorinse；
2. Fluorinse is heated to 60~70 DEG C, aluminum sulfate and active aluminium hydroxide are added several times, with 500~
800rpm/min carries out high shear agitation, is then added stabilizer, temperature control at 70 DEG C or so, mixing time is 90~
150min tentatively obtains alkali-free quick-coagulant mother liquor；
3. compounding to alkali-free quick-coagulant mother liquor, triethanolamine, polyacrylamide and organic water-reducing agent, temperature control is added
For system at 40~60 DEG C, mixing speed is 300~500rpm/min, and the reaction time is 60~90min, is obtained after filtering described
Early high-strength compound alkali-free liquid accelerator.
Using the early high-strength compound alkali-free liquid accelerator of the embodiment of the present application, there is following positive effect:
1. it is good to promote solidifying effect.According to requiring in GB/T35159-2017 " gunite concrete accelerator " standard, water is carried out
Cement paste test, the alkali-free liquid accelerating agent is under compared with low-dosage (the 3%~5% of cement quality), and the presetting period is on the left side 2min
The right side, final setting time is within 6min.
2. early strength and later strength are high.According to being wanted in GB/T35159-2017 " gunite concrete accelerator " standard
It asks, carries out cement mortar test, measuring 1 day intensity is 15MPa or so, and compressive strength rate meets or exceeds 100% within 28 days.
3. stability is good.The alkali-free liquid accelerator is able to maintain solution high concentration 65% or more, does not generate precipitating and knot
It is brilliant.
4. adaptability is good.The cement of the alkali-free liquid accelerator and different sources different brands has good adaptability.
5. in work progress, the springback capacity and Dust Capacity of gunite concrete can be effectively reduced, supporting effect, control are effectively improved
Surrouding rock deformation processed.
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.
In the following embodiments, reagent, material and the instrument used such as not special explanation, it is commercially available to obtain
?.
Embodiment 1
Early high-strength compound alkali-free liquid accelerator each component is by mass percentage: aluminum sulfate 50%, active aluminium hydroxide
10%, sodium fluoride 8%, diethanol amine 2%, triethanolamine 1%, polyacrylamide 0.5%, organic water-reducing agent 2%, stabilizer
0.8%, water 25.7%.
Early high-strength compound alkali-free liquid accelerator it is specific the preparation method is as follows:
1. sodium fluoride, is added to the water by the water for weighing 25.7% first at normal temperature, 20min is quickly stirred, is then added
Diethanol amine continues to stir 10min, obtains Fluorinse；
2. Fluorinse is heated to 60 DEG C, aluminum sulfate and active aluminium hydroxide is added, several times with 600rpm/
Min carries out high shear agitation, and stabilizer is then added, and temperature is controlled at 70 DEG C, and mixing time 120min tentatively obtains nothing
Alkali accelerator mother liquor；
3. compounding to alkali-free quick-coagulant mother liquor, triethanolamine, polyacrylamide and organic water-reducing agent, temperature control is added
System obtains the early high-strength compound at 40 DEG C, mixing speed 500rpm/min, reaction time 60min after filtering
Alkali-free liquid accelerator.
Embodiment 2
Early high-strength compound alkali-free liquid accelerator each component is by mass percentage: aluminum sulfate 45%, active aluminium hydroxide
10%, sodium fluoride 10%, diethanol amine 1%, triethanolamine 1%, polyacrylamide 1%, organic water-reducing agent 2%, stabilizer
1%, water 29%.
Early high-strength compound alkali-free liquid accelerator it is specific the preparation method is as follows:
1. sodium fluoride, is added to the water by the water for weighing 29% first at normal temperature, 30min is quickly stirred, is then added two
Ethanol amine continues to stir 10min, obtains Fluorinse；
2. Fluorinse is heated to 60 DEG C, aluminum sulfate and active aluminium hydroxide is added, several times with 800rpm/
Min carries out high shear agitation, and stabilizer is then added, and temperature is controlled at 75 DEG C, and mixing time 150min tentatively obtains nothing
Alkali accelerator mother liquor；
3. compounding to alkali-free quick-coagulant mother liquor, triethanolamine, polyacrylamide and organic water-reducing agent, temperature control is added
System obtains the early high-strength compound at 50 DEG C, mixing speed 400rpm/min, reaction time 75min after filtering
Alkali-free liquid accelerator.
Embodiment 3
Early high-strength compound alkali-free liquid accelerator each component is by mass percentage: aluminum sulfate 55%, active aluminium hydroxide
5%, sodium fluoride 5%, diethanol amine 2%, triethanolamine 1%, polyacrylamide 0.5%, organic water-reducing agent 1.5%, stabilizer
0.8%, water 29.2%.
Early high-strength compound alkali-free liquid accelerator it is specific the preparation method is as follows:
1. sodium fluoride, is added to the water by the water for weighing 29.2% first at normal temperature, 15min is quickly stirred, is then added
Diethanol amine continues to stir 15min, obtains Fluorinse；
2. Fluorinse is heated to 65 DEG C, aluminum sulfate and active aluminium hydroxide is added, several times with 600rpm/
Min carries out high shear agitation, and stabilizer is then added, and temperature is controlled at 70 DEG C, and mixing time 120min tentatively obtains nothing
Alkali accelerator mother liquor；
3. compounding to alkali-free quick-coagulant mother liquor, triethanolamine, polyacrylamide and organic water-reducing agent, temperature control is added
System obtains the early high-strength compound at 45 DEG C, mixing speed 400rpm/min, reaction time 80min after filtering
Alkali-free liquid accelerator.
Embodiment 4
Early high-strength compound alkali-free liquid accelerator each component is by mass percentage: aluminum sulfate 45%, active aluminium hydroxide
8%, sodium fluoride 7%, diethanol amine 1.5%, triethanolamine 1%, polyacrylamide 1%, organic water-reducing agent 3%, stabilizer
0.8%, water 32.7%.
Early high-strength compound alkali-free liquid accelerator it is specific the preparation method is as follows:
1. sodium fluoride, is added to the water by the water for weighing 32.7% first at normal temperature, 15min is quickly stirred, is then added
Diethanol amine continues to stir 15min, obtains Fluorinse；
2. Fluorinse is heated to 65 DEG C, aluminum sulfate and active aluminium hydroxide is added, several times with 600rpm/
Min carries out high shear agitation, and stabilizer is then added, and temperature is controlled at 70 DEG C, and mixing time 120min tentatively obtains nothing
Alkali accelerator mother liquor；
3. compounding to alkali-free quick-coagulant mother liquor, triethanolamine, polyacrylamide and organic water-reducing agent, temperature control is added
System obtains the early high-strength compound at 45 DEG C, mixing speed 400rpm/min, reaction time 80min after filtering
Alkali-free liquid accelerator.
Embodiment 5
Early high-strength compound alkali-free liquid accelerator each component is by mass percentage: aluminum sulfate 50%, active aluminium hydroxide
5%, sodium fluoride 7%, diethanol amine 2%, triethanolamine 0.5%, polyacrylamide 0.5%, organic water-reducing agent 2.5%, stabilization
Agent 1%, water 31.5%.
Early high-strength compound alkali-free liquid accelerator it is specific the preparation method is as follows:
1. sodium fluoride, is added to the water by the water for weighing 31.5% first at normal temperature, 15min is quickly stirred, is then added
Diethanol amine continues to stir 10min, obtains Fluorinse；
2. Fluorinse is heated to 60 DEG C, aluminum sulfate and active aluminium hydroxide is added, several times with 500rpm/
Min carries out high shear agitation, and stabilizer is then added, and temperature is controlled at 70 DEG C, and mixing time 150min tentatively obtains nothing
Alkali accelerator mother liquor；
3. compounding to alkali-free quick-coagulant mother liquor, triethanolamine, polyacrylamide and organic water-reducing agent, temperature control is added
System obtains the early high-strength compound at 45 DEG C, mixing speed 300rpm/min, reaction time 90min after filtering
Alkali-free liquid accelerator.
Comparative example 6
Accelerator proportion are as follows: aluminum sulfate 55%, aluminium hydroxide 5%, diethanol amine 2%, triethanolamine 0.5%, polypropylene
Amide 0.5%, stabilizer 1%, water 36%.
Comparative example 7
Accelerator proportion are as follows: aluminum sulfate 55%, sodium fluoride 8%, diethanol amine 1%, triethanolamine 0.5%, polyacrylamide
Amine 0.5%, stabilizer 1%, water 34%.
Comparative example 8
Commercially available alkali-free liquid accelerator: BASF Hock Mining Chemical (China) Co., Ltd., alkali-free liquid accelerator, beauty
GuSA160 is obtained through test, and volume is 6%~10%, and presetting period 3min acts on, final setting time 10min or so, and 28 days
Intensity retention is 87%.
The present invention is tested and is tried out, and satisfied technical effect is achieved, and efficiency test data is as follows:
Cement paste setting time and water are carried out according to the requirement of GB/T35159-2017 " gunite concrete accelerator "
The test of cement mortar compression strength.Wherein, the volume of liquid accelerating agent is calculated according to the percentage of cement weight, liquid speed used
Solidifying agent is the product of Examples 1 to 5 preparation, and 6~7 be comparative example accelerator, and 8 be commercially available alkali-free liquid accelerator.
The measurement of cement paste setting time:
Cement 400g
Water 140g (should subtract water content in liquid accelerator)
Cement mortar compressive strength determination:
Cement 900g
Normal sand 1350g
Water 450g
Test result is as shown in table 1:
The alkali-free liquid accelerator application effect of table 1
As shown in Table 1, which is all satisfied GB/T35159-2017 " gunite concrete speed
Solidifying agent " requirement in specification, setting time is fast, and can effectively improve mortar early strength, the basic free of losses of later strength.
In order to verify the alkali-free liquid accelerator to the adaptability of different cement, 5 kinds of more commonly used water in engineering are selected
Mud measures setting time respectively and mortar strength, test result is as shown in table 2.Accelerator selects sample 1, and cement is respectively base
Quasi- cement, scenery with hills and waters cement, conch cement, chimera cement and Three Gorges cement.
Application effect of the accelerator of table 2 to different cement
As shown in Table 2, for this 5 kinds of cement, which is all satisfied the requirement in specification.By calculating, the nothing is obtained
Alkali liquid quick-setting agent is 0.3 to the accommodation coefficients of different cement, is less than standard value 0.8, illustrate to 5 kinds of cement adaptabilities compared with
It is good.Since these cement have certain representativeness, and application amount is bigger in engineering at the scene, it can thus be seen that the speed
Solidifying agent has good adaptability from different cement.
Application effect of 3 comparative example of table, 6,7,8 accelerator to different cement
The liquid accelerator of comparative selection example 6,7,8 in table 3, according to respective the optimum mix amount be incorporated into this 5 kinds it is different
It in cement, can be obtained by data in table, on the one hand, using the liquid accelerator in comparative example, volume is greater than the application implementation
The liquid accelerator volume of example, and its setting time is longer than the setting time of the embodiment of the present application, and mortar strength is than this Shen
Please embodiment mortar strength it is low；On the other hand, 6 accelerators of comparison are 1.3 to the accommodation coefficient of different cement, compare 7 rapid hardenings
Agent is 1.45 to the accommodation coefficient of different cement, and 8 accelerators of comparison are 1.31 to the accommodation coefficient of different cement, is all larger than standard
Value 0.8.Illustrate that these types of accelerator is poor to different types of cement adaptability.
Above description is only the preferred embodiment of the application and the explanation to institute's application technology principle.Those skilled in the art
Member is it should be appreciated that invention scope involved in the application, however it is not limited to technology made of the specific combination of above-mentioned technical characteristic
Scheme, while should also cover in the case where not departing from the inventive concept, it is carried out by above-mentioned technical characteristic or its equivalent feature
Any combination and the other technical solutions formed.Such as features described above has similar function with (but being not limited to) disclosed herein
Can technical characteristic replaced mutually and the technical solution that is formed.
Claims (10)
1. a kind of morning high-strength compound alkali-free liquid accelerator, it is characterised in that: the alkali-free liquid accelerator includes by weight
Following components:
Aluminum sulfate 45%~55%；
Active aluminium hydroxide 5%~10%；
Fluoride salt 5%~10%；
Hydramine 1.5%~4%；
Polyacrylamide 0.5%~1%；
Organic water-reducing agent 1%~3%；
Stabilizer 0.8%~1%；
Water 25%~35%.
2. morning high-strength compound alkali-free liquid accelerator according to claim 1, it is characterised in that: the fluoride salt is selected from fluorine
Change one of sodium, potassium fluoride, magnesium fluoride or a variety of.
3. morning high-strength compound alkali-free liquid accelerator according to claim 1, it is characterised in that: the hydramine is selected from diethyl
Hydramine, triethanolamine, monoethanolamine, dimethylethanolamine, diethyl ethylene diamine, methyl diethanolamine, in ethyldiethanolamine
One or more combinations.
4. morning high-strength compound alkali-free liquid accelerator according to claim 3, it is characterised in that: the hydramine includes three second
Hydramine, the parts by weight of the triethanolamine are 0.5%~1%.
5. morning high-strength compound alkali-free liquid accelerator according to claim 3 or 4, it is characterised in that: the hydramine includes
Diethanol amine, the parts by weight of the diethanol amine are 1%~3%.
6. morning high-strength compound alkali-free liquid accelerator according to claim 1, it is characterised in that: organic water-reducing agent is
Polyethylene glycol type condensation polymer.
7. morning high-strength compound alkali-free liquid accelerator according to claim 1, it is characterised in that: the stabilizer is hydration
Magnesium silicate.
8. a kind of preparation method of -7 any early high-strength compound alkali-free liquid accelerators according to claim 1, including with
Lower step:
Step 1: fluoride salt, diethanol amine and water being mixed, fluorination salting liquid is obtained；
Step 2: the fluorination salting liquid being heated to 60~70 DEG C, aluminum sulfate, active aluminium hydroxide and stabilizer is added, is carried out
High-speed stirred obtains alkali-free quick-coagulant mother liquor；
Step 3: Xiang Suoshu alkali-free quick-coagulant mother liquor is added hydramine, polyacrylamide and organic water-reducing agent, temperature control 40~
60 DEG C, the early high-strength compound alkali-free liquid accelerator is obtained after filtering.
9. the preparation method of morning high-strength compound alkali-free liquid accelerator according to claim 8, which is characterized in that further include
Technical characteristic is one or more as follows:
A1) in the step 1, sodium fluoride is added to the water at normal temperature, 10~30min is quickly stirred, diethanol is then added
Amine continues 10~20min of stirring, obtains Fluorinse；
A2) in the step 2, when Fluorinse is heated to 60~70 DEG C, aluminum sulfate and active hydroxide are added several times
Aluminium carries out high shear agitation with 500~800rpm/min, and stabilizer is then added, and temperature is controlled at 70 DEG C or so, stirring
Between be 90~150min, tentatively obtain alkali-free quick-coagulant mother liquor；
A3) in the step 3, alkali-free quick-coagulant mother liquor is compounded, triethanolamine, polyacrylamide and organic diminishing is added
Agent, at 40~60 DEG C, mixing speed is 300~500rpm/min for temperature control, and the reaction time is 60~90min, after filtering
Obtain the early high-strength compound alkali-free liquid accelerator.
10. a kind of gunite concrete, it is characterised in that: the gunite concrete includes morning as claimed in claim 1
High-strength compound alkali-free liquid accelerator, the volume of the alkali-free liquid accelerator are 3 of cement quality in the gunite concrete
~5%；
The cement type accommodation coefficient c of the alkali-free liquid acceleratoraLess than 0.8,
Wherein, the test method of the cement type accommodation coefficient are as follows:
Alkali-free liquid accelerator is applied in five kinds of test cement types with 4% volume, is obtained for different cement types
The coefficient of dispersion of each sub-indicator, the sub-indicator include presetting period index, final setting time index, 1d intensity index and
28d intensity is than index, the accommodation coefficient caFor the sum of the coefficient of dispersion of each sub-indicator.
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Application publication date: 20190910 |