CN108793935A - Prefabricated siccative gunite concrete - Google Patents
Prefabricated siccative gunite concrete Download PDFInfo
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- CN108793935A CN108793935A CN201810976597.1A CN201810976597A CN108793935A CN 108793935 A CN108793935 A CN 108793935A CN 201810976597 A CN201810976597 A CN 201810976597A CN 108793935 A CN108793935 A CN 108793935A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
- C04B2111/00155—Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
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- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a kind of prefabricated dry-mix shotcretes, belong to building material technical field, its key points of the technical solution are that in terms of parts by weight, including following component：Cement, cobble, middle sand, efficient accelerator, binder, water-reducing agent；The cement is P.O42.5 grades of Portland cements；The binder includes attapulgite, sodium metasilicate and potassium water glass, and the weight ratio of the attapulgite, sodium metasilicate and potassium water glass is 2:1:1.The present invention can reduce dust pollution while improving the intensity and compactness of concrete, reduce rebound degree by selecting rational control cement-aggregate ratio and sand coarse aggregate ratio；By attapulgite, sodium metasilicate and potassium water glass, the aridity of dry mix can be improved, the adhesive force after its injection and viscosity is improved, reduces rebound degree, sodium metasilicate and potassium water glass all have good heat resistance in addition, can improve the heat resistance of concrete.
Description
Technical field
The present invention relates to building material technical fields, more specifically, it is related to a kind of prefabricated siccative gunite concrete.
Background technology
Gunite concrete is the construction method that placing pea gravel concreten is sprayed with Spray Gun Of The Pressure.Be usually used in placing tunnel liner,
The protective layer of the lining and steel construction of the thin-wall constructions such as wall, ceiling or other structures.Mainly there is dry mixing method and wet at present
Two kinds of spray regimes of mix process, 1. gunite concrete dry mixing method：Dry mixing method is that mix is uniform in the dry state by cement, sand, stone,
The method that itself and accelerator are sent to nozzle with compressed air and sprayed after being mixed with pressure water；2. gunite concrete wet-mixing
Method：Wet-mixing method is that mixed concrete is pumped to nozzle by mud jacking, then the method sprayed with compressed air, when construction
Preferably with the method mixed with spray, to reduce consistency change.
Wherein dry mixing method with adaptable (easy to use, maneuverability, can remote force feed), place demand is small, machine
The advantages such as at low cost, easy to operate, the extensive use in China's underground engineering；But due to dry mixing method Site its to environment
Seriously polluted, the problem that dust is big, efficiency is low, unstable quality and rebound degree are high limits which limit its development.
Invention content
The purpose of the present invention is to provide a kind of prefabricated dry-mix shotcretes, by selecting rational control cement-aggregate ratio
And sand coarse aggregate ratio, dust pollution can be reduced while improving the intensity and compactness of concrete, reduce rebound degree；Pass through
Attapulgite, sodium metasilicate and potassium water glass can improve the aridity of dry mix, improve the adhesive force after its injection and glue
Property, rebound degree is reduced, sodium metasilicate and potassium water glass all have good heat resistance in addition, can improve the heat resistance of concrete
Energy.
The present invention above-mentioned technical purpose technical scheme is that：
A kind of prefabricated dry-mix shotcrete, in terms of parts by weight, including following component：
The cement is P.O42.5 grades of Portland cements；
The binder includes attapulgite, sodium metasilicate and potassium water glass, the attapulgite, sodium metasilicate and potassium water glass
Weight ratio be 2:1:1.
By using above-mentioned technical proposal, gunite concrete to the basic demand of cement used is condensed after mixing accelerator
Fast good water-retaining property, early strength increase soon, and contraction is small, in addition it is also contemplated that the intermiscibility of synchronized solidifying agent, cement type and label
Selection should mainly meet requirement of engineering；P.O42.5 grades of Portland cements are good with the intermiscibility of accelerator, and energy rapid hardening is fast
Firmly, later strength is also higher.
Cement-aggregate ratio (i.e. the ratio between cement and aggregate) is an important factor for influencing gunite concrete, and suitable ratio is 1:4-1:
4.5, cement is very few, and springback capacity is big, and early strength increases slow；Cement is excessive, and not only Dust Capacity increases, and the concrete after hardening
Contraction also increases, and also influences the growth of late strength of concrete.
Grading of aggregates, which mixes and stirs gunite concrete, expects by the mobility of pipeline, the aquation at nozzle, to viscous by spray plane
The compactness of attached and final gunite concrete and cost control all play an important role.When using alkaline accelerator, it must not use
Stone material containing active silica makees aggregate, makees aggregate using the stone material containing active silica, easy tos produce Plant ecology
Reaction, causes the cracking destruction of gunite concrete.
Gunite concrete preferably selects medium coarse sand with sand, and the fineness modulus of middle sand is 2.95, apparent density 2.70g/
cm3, bulk density 1495kg/m3.Sand is meticulous, drying shrinkage can be made to increase；Sand is excessively thick, then will increase rebound；Grain size 0.2mm
Particle be no more than 20%, clay content equal to 1.0% middle sand-lime dirt it is few, if being stained with dust around aggregate, cement can be harmed
Hydration significantly affects the growth of intensity.
The sand coarse aggregate ratio of the present invention is 45% or so, and when sand coarse aggregate ratio increases, outer-area in unit-quantity increases, the cement of package aggregate
Grain just seems insufficient, and sand coarse aggregate ratio increases, and coarse aggregate is just reduced, thus the intensity of concrete will reduce；But sand coarse aggregate ratio is too small just not to be had
There are enough sands to fill the hole of coarse aggregate, influencing the density of concrete causes its strength reduction, and subtracts in sand coarse aggregate ratio
Hour, rebound degree will increase, therefore sand coarse aggregate ratio is 45% or so, can meet the requirement of intensity, rebound degree will not be made excessive.
Sand coarse aggregate ratio needs the moisture content for having certain, and the dust, reduction when can reduce dry sprayed concrete spring back, increase
Mixing uniformity and raising intensity, but there is the sandstone aggregate of certain moisture content not carried out immediately into mix with cement mixing
When sprayed construction, cement therein is with meeting generation " prehydration " phenomenon in sandstone, common " caking " phenomenon in construction, this
Kind phenomenon can aggravate with the extension of resting period, and sticky small, the poor adhesive force of the dry mix after " caking ", it can both influence to mix
The intensity for coagulating soil can also be such that rebound degree in concrete ejection increases, and the adhesive in invention can make up this defect.
The adhesive of the present invention selects attapulgite, sodium metasilicate and potassium water glass, improves the aridity of dry mix, carries
Adhesive force after its high injection and viscosity, reduce rebound degree.
Attapulgite is also known as palygorskite or Palygorskite, is a kind of clay of zeopan containing Shuifu County of tool chain layer structure
Mineral；Attapulgite has preferable draw ratio and abundant inner duct, is preferable reinforcing material, there is following effect：①
Attapulgite has good dispersibility, is conducive to the evenly dispersed of dry mix；2. attapulgite has cellular millions of holes
Gap, surface area is quite big, and hydroscopicity variation range is between 23.38-27.43%, and quality is more stable, can conduct
The phenomenon that drier of dry mix uses, " prehydration " that prevents cement from occurring with sandstone, " caking " reduced in construction are existing
As improving the storage period of dry mix；3. the adhesive property of attapulgite is good, light toughness is big, when it is mixed with water,
The viscosity and adhesive force of concrete can be increased, reduce rebound degree when concrete ejection.
Sodium metasilicate can change inside concrete pore structure, and hydrated cementitious early stage is promoted to generate a certain number of entringite,
It mutually puts up a bridge and accelerates early stage to agglomerate the formation of network and increase the compactness of Behavior of Hardened Cement Paste, and sodium metasilicate belongs to mine adhesive, it can
To improve the cohesive force of concrete cement and aggregate, sodium metasilicate is heat-resist in addition, can improve the heat resistance of concrete.
Potassium water glass is with mechanical strength is big, cohesive force is high, voidage is small, impervious water resistance is high, acid resistance is good, heat-resisting
Property is good, and easily in normal temperature cure, construction is simple, engineering service life is long.
Main purpose using accelerator is to keep gunite concrete rapid hardening hard soon, reduces rebound loss, prevents injection coagulation
Soil is caused due to gravity to fall off, and improves the conformability that it is used in moist or water-bearing stratum, appropriate to increase primary spray
It penetrates thickness and shortens jetted layers interval time；Accelerator should meet following condition：Initial set within 3min, final set 12min with
Interior, the intensity after 8h is not less than 0.3MPa, and 28d intensity is not added with the 70% of accelerator test piece intensity.
The main component of water-reducing agent is surfactant, has relatively good plasticizing water-reducing effect, water-reducing agent to cement
Plastication to concrete can increase mobility, improve the performance of maturing；Water-reducing agent makees the plasticizing of concrete
With being mainly manifested in the following aspects:(1) peptizaiton is adsorbed；(2) wetting action；(3) lubricating action is by water-reducing agent institute
Absorption dispersion, wetting and the lubricating action risen, as long as easily that concrete mixing is uniform using less amount of water,
Make concrete workability be improved significantly.
The present invention is further arranged to：The efficient accelerator is prepared with the following method：In terms of parts by weight, room temperature
Under, 20-25 parts of water and 5-10 parts of magnesium fluosilicates are added in four-hole boiling flask, after magnesium fluosilicate dissolving, three second of 4-6 parts is added
Hydramine and 0.5-0.8 parts of lauroyl diethanolamines, 60-80 DEG C is warming up to by temperature, is stirred with the speed of 200-300r/min
After 10-15min, 55-60 parts of aluminum sulfate are then added, then continue to stir 1-1.5h with the speed of 1000-1200r/min；Most
1-1.5 parts of ethylenediamine tetraacetic methene sodium phosphates are added afterwards and stir 20-30min, efficient accelerator is made.
By using above-mentioned technical proposal, efficient accelerator prepared by the present invention can make cement rapid condensation, with cement
Compatibility it is good, stability is high, reduces rebound degree when injection, reduces the influence to strength of cement.
The present invention is further arranged to：The cobble is 4.75-10mm continuous gradings, content of stone powder 1.0%.
By using above-mentioned technical proposal, coarse aggregate is preferably cobble, although maximum can be used in domestic spraying machine at present
Grain size is the coarse aggregate of 25mm, but in order to reduce the blocking of rebound degree and mixture in pipeline, maximum diameter of aggrogate should not be big
In 15mm, when the grain size of cobble is 4.75-10mm continuous gradings, effect is best.
The present invention is further arranged to：The fineness modulus of the middle sand is 2.95, and the particle of grain size 0.2mm is no more than
20%, clay content is less than 1.0%, moisture content 4-6%, apparent density 2.70g/cm3, bulk density 1495kg/m3。
By using above-mentioned technical proposal, gunite concrete sand should select hard durable middle sand or coarse sand, fineness mould
Number preferably greater than 2.95, clay content is less than 1%, and sand is meticulous, drying shrinkage can be made to increase, and dust, meeting are stained with around meticulous sand
The hydration for harming cement, significantly affects the growth of intensity, dust also increases；Sand is excessively thick, then will increase rebound；Moisture content
It is advisable with 4-6%, dust, reduction rebound, increase mixing uniformity and the raising intensity when dry sprayed concrete can be reduced.
The present invention is further arranged to：The grain size of the attapulgite is 0.6-0.8 μm.
By using above-mentioned technical proposal, the grain size of attapulgite is 0.6-0.8 μm, and grain size is small, can be better
Dry-mixed mortar is filled, due to that can be expanded after its water suction, improves the cracking resistance of dry-mixed mortar.
The present invention is further arranged to：The potassium water glass is potassium water glass K2O·nSiO2, wherein modulus n is 2.60-
2.90。
By using above-mentioned technical proposal, potassium water glass is with mechanical strength is big, cohesive force is high, voidage is small, impervious resistance to
It is aqueous it is high, acid resistance is good, heat-resist, easily in normal temperature cure, construction is simple, engineering service life is long.
The present invention is further arranged to：The presetting period of the efficient accelerator is 2-3min, final setting time 8-
Intensity after 10min, 8h is not less than 1MPa, and 28d intensity is not added with the 90% of accelerator intensity.
By using above-mentioned technical proposal, efficient accelerator can be such that concrete condenses rapidly, improve the early stage of concrete
Intensity reduces the rebound degree of gunite concrete, is convenient for the progress of site operation.
The present invention is further arranged to：The water-reducing agent is naphthalene series high-efficiency water-reducing agent.
By using above-mentioned technical proposal, naphthalene series high-efficiency water-reducing agent is the non-research work of air entrained type high efficiency water reducing agent through chemical industry synthesis,
Chemical name naphthalenesulfonate formaldehyde condensation compound, it has very strong peptizaiton for cement particle.
In conclusion the present invention has the advantages that compared with the prior art：
1. the rational control cement-aggregate ratio of selection and sand coarse aggregate ratio, can be while improving the intensity and compactness of concrete, drop
Low dust pollution reduces rebound degree；
2. attapulgite, sodium metasilicate and potassium water glass can improve the aridity of dry mix, the adhesive force after its injection is improved
With viscosity, rebound degree is reduced, this outer sodium metasilicate and potassium water glass all have good heat resistance, can improve the resistance to of concrete
Hot property；
3. efficient accelerator can reduce the loss to concrete strength, improve the rebound degree of concrete, accelerates the condensation of concrete
Time improves the early strength of concrete.
Specific implementation mode
Invention is further described in detail below.
One, the component of impervious anti-crack concrete is shown in table 1 in embodiment 1-6.
Impervious anti-crack concrete component table (unit in 1 embodiment 1-6 of table：kg)
Wherein, cement is P.O42.5 grades of Portland cements；Cobble is 4.75-10mm continuous gradings, and content of stone powder is
1.0%；The fineness modulus of middle sand is 2.95, and the particle of grain size 0.2mm is no more than 20%, and clay content is less than 1.0%, and moisture content is
4-6%, apparent density 2.70g/cm3, bulk density 1495kg/m3；The grain size of attapulgite is 0.6-0.8 μm；Potassium water glass
For potassium water glass K2O·nSiO2, wherein modulus n is 2.60-2.90；Accelerator is aluminate class accelerator, and index is initial set
Time is 2-3min, and the intensity after final setting time 8-10min, 8h is not less than 0.3MPa, and 28d intensity is not added with accelerator
The 70% of intensity.
Two, the preparation example 1-3 of efficient accelerator
Preparation example 1：At room temperature, 20kg water and 5kg magnesium fluosilicates are added in four-hole boiling flask, after magnesium fluosilicate dissolving, are added
Enter 4kg triethanolamines and 0.5kg lauroyl diethanolamines, temperature is warming up to 60 DEG C, is stirred with the speed of 200r/min
After 15min, 55kg aluminum sulfate is then added, then continues to stir 1.5h with the speed of 1000r/min；It is eventually adding 1kg second two
Four methene sodium phosphate of amine stirs 20min, and efficient accelerator is made.
Preparation example 2：At room temperature, 22.5kg water and 7.5kg magnesium fluosilicates are added in four-hole boiling flask, wait for that magnesium fluosilicate is molten
Xie Hou is added 5kg triethanolamines and 0.75kg lauroyl diethanolamines, temperature is warming up to 75 DEG C, with the speed of 250r/min
After degree stirring 12.5min, 57.5kg aluminum sulfate is then added, then continues to stir 1.25h with the speed of 1100r/min；Finally
1.25kg ethylenediamine tetraacetic methene sodium phosphates are added and stir 25min, efficient accelerator is made.
Preparation example 3：At room temperature, 25kg water and 10kg magnesium fluosilicates are added in four-hole boiling flask, wait for that magnesium fluosilicate dissolves
Afterwards, 6kg triethanolamines and 0.8kg lauroyl diethanolamines is added, temperature is warming up to 80 DEG C, is stirred with the speed of 300r/min
After mixing 10min, 60kg aluminum sulfate is then added, then continues to stir 1h with the speed of 1200r/min；It is eventually adding 1.5kg second
Four methene sodium phosphate of diamines stirs 30min, and efficient accelerator is made.
Three, comparative example 1-5
Comparative example 1：Use application publication number for CN106477987A patent application documents, it discloses a kind of novel injection coagulations
Soil, including the material mixing of following weight fraction forms, 120 parts of the quartz of grain size 0-2.36m, the sand of grain size 2.36-4.75mm
183 parts of son, 42.5 grades of cement, 220 parts of R types, 4 parts of tea series high-efficiency water-reducing agent, 3 parts of 6mmPP fibers, 40 parts of swelling agent, nanoscale mine
A30 parts, B100 parts of mine, 100 parts of nanoscale bloodstone slag powders, 300 parts of the mechanism stone of grain size 4.75-10mm.
Comparative example 2：Use application publication number for the patent application document of CN101265058A, it discloses a kind of injection is mixed
Solidifying soil, including cement, sandstone mixture, steel fibre, accelerator, extraordinary additive, the special type additive be primary chemical at
It is divided into SiO2And Al2O3Inorganic neutral nano-sized zeolites, wherein water:Cement:Sandstone mixture:Steel fibre mixing ratio by weight is
8.5-8.6:16.1-20.0:69.6-73.5:1.7-1.8, extraordinary additive are the 5-10% of cement weight, and accelerator is cement
The 6-8% of weight.
Comparative example 3：Comparative example 3 is difference from example 1 is that be not added with attapulgite in raw material.
Comparative example 4：Comparative example 4 is difference from example 1 is that be not added with sodium metasilicate in raw material.
Comparative example 5：Comparative example 5 is difference from example 1 is that be not added with potassium water glass in raw material.
Comparative example 6：Comparative example 6 is difference from example 1 is that the accelerator added in raw material is common aluminate
Class accelerator.
Four, the performance of embodiment 1-6 and comparative example the 1-6 gunite concrete prepared is tested, by test result
It is shown in table 2.
The production method of gunite concrete test specimen uses JGJ/T372-2016《Gunite concrete application technology regulation》In it is attached
The requirement of record B prepares it.
According to GB/T50081-2016《Common coagulation scholar's mechanical test method standard》, the slump to gunite concrete
Degree is tested.
According to JGJ/T372-2016《Gunite concrete application technology regulation》The test method of middle appendix C, to spraying coagulation
The compression strength of native test specimen is tested.
According to JGJ/T372-2016《Gunite concrete application technology regulation》The test method of middle Appendix D, to spraying coagulation
The adhesion strength of native test specimen is tested.
According to JGJ/T372-2016《Gunite concrete application technology regulation》The test method of middle annex G, to spraying coagulation
The rebound degree of native test specimen is tested.
According to GB/T50082-2009《Common coagulation scholar long-term behaviour and endurance quality test method standard》In step by step
The infiltration depth of pressurization testing standard gunite concrete.
The performance test table of gunite concrete prepared by 2 embodiment 1-6 of table and comparative example 1-6
As can be seen from the above data, gunite concrete prepared by embodiment 1-6 has good anti-compared to comparative example 1-6
Compressive Strength, and there is smaller rebound degree, illustrate that gunite concrete prepared by the present invention has good intensity, processability
Can, the utilization rate of gunite concrete is improved, waste is reduced, reduces dust pollution；In addition, injection coagulation prepared by embodiment 1-6
The infiltration depth of soil illustrates that gunite concrete prepared by the present invention has significantly lower than gunite concrete prepared by comparative example 1-5
Good anti-permeability performance.
In addition, there are many factor for influencing gunite concrete jeting effect, in order to obtain good construction effect, in addition to using
Other than rational formulation ratio, in spraying operation, it is also necessary to consider the following aspects：
1. wind pressure controls：When wind pressure at nozzle is stablized within the scope of 0.1-0.2MPa, springback capacity is controlled the most advantageous；This
When spraying machine on pressure gauge reading be 0.2-0.45MPa, and wind regime wind pressure should be stablized within the scope of 0.4-0.65MPa.
2. water rate control：Due to the particularity of spray technology, water is added by gun slot, and amount of water is entirely with operator
The experience of member judges according to gunite concrete surface appearance, is controlled by water adjusting valve；In general, when injection coagulation
When trickling, sliding, drawing crack occurs in native surface, show that the ratio of mud is too big；If there is dust in dry spot, operation in gunite concrete surface
Greatly, rebound is more, then shows that the ratio of mud is too small.The suitable ratio of mud is 0.4-0.5, and within the scope of this, concrete surface is smooth,
In water light pool, dust and springback capacity are less, deviate this range, not only reduce sprayed concrete strength, also make springback capacity
Increase.
3. hydraulic pressure control：Hydraulic pressure should control within the scope of higher 0.1-0.15MPa than conveying pipeline wind pressure at water spout, and spray
The system hydraulic pressure of operation area should be greater than 0.4MPa, and gunite concrete effect is best at this time.
4. spray angle controls：Spray it is smooth by spray plane when, nozzle should be vertical with by spray plane, as gunite concrete is penetrated
Stream cannot be vertical with by spray plane, and springback capacity will be caused to increase to be reduced with compactness, while very big change will also occur for concrete strength
Change.
5. distance controlling：The distance of jet length has a great impact to the quality and springback capacity of gunite concrete, works as wind
Pressure suitable for when, nozzle with by spray plane optimum distance be generally 0.8-1.2m.
6. the time interval controls between jet thickness of concrete and each spray-up：Jet thickness is blocked up to be often resulted in
Concrete is sagging or falls off, this is because fresh gunite concrete, tension and adhesion strength are all very low, once gunite concrete
When dead weight is more than it with adhesion strength by spray plane, that is, occurs sagging or fall off；When stream starts with being collided by spray plane, rebound
Rate is very big, and coarse aggregate is almost shot back entirely；After forming the mortar ductile bed of 0.5-1cm, coarse aggregate is just embedded into, and rebound is gradual
Reduce, in 5cm, rebound is basicly stable to get off jet thickness.
7. spraying subregion to control with injection order：In order to reduce gunite concrete due to gravity caused by slide or de-
Fall phenomenon, when injection should be segmented, branch, piecemeal, from bottom to top, first abutment wall, rear arch springing and haunch, finally spray the principle of vault into
Row concrete ejection；To the scar of concave-convex great disparity, when injection, should be noted that injection sequence will get on, get off, intermediate behind first both ends, with
Reducing reflected rate；Nozzle is directed toward the time of one place too long, and not only springback capacity increases, and is difficult to obtain uniform thickness, and
When, by spray scar, it being made uniformly slowly to corkscrew in a clockwise direction using nozzle face, can be formed uniform
Gunite concrete, concrete springback rate are minimum.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (8)
1. a kind of prefabricated dry-mix shotcrete, it is characterised in that：In terms of parts by weight, including following component：
100-120 parts of cement；
400-420 parts of cobble；
Middle sand 325-345 parts；
Efficient 2.5-4 parts of accelerator；
20-30 parts of binder；
1-3 parts of water-reducing agent；
The cement is P.O42.5 grades of Portland cements；
The binder includes attapulgite, sodium metasilicate and potassium water glass, the attapulgite, sodium metasilicate and potassium water glass
Weight ratio be 2:1:1.
2. prefabricated dry-mix shotcrete according to claim 1, it is characterised in that：The efficient accelerator is using as follows
It is prepared by method：In terms of parts by weight, at room temperature, 20-25 parts of water and 5-10 parts of magnesium fluosilicates is added in four-hole boiling flask, wait for fluorine
After magnesium silicate dissolving, 4-6 parts of triethanolamines and 0.5-0.8 parts of lauroyl diethanolamines are added, temperature is warming up to 60-80
DEG C, after the speed stirring 10-15min of 200-300r/min, 55-60 parts of aluminum sulfate are then added, then with 1000-1200r/
The speed of min continues to stir 1-1.5h；1-1.5 parts of ethylenediamine tetraacetic methene sodium phosphate stirring 20-30min are eventually adding, height is made
Imitate accelerator.
3. prefabricated dry-mix shotcrete according to claim 1, it is characterised in that：The cobble connects for 4.75-10mm
Continuous grading, content of stone powder 1.0%.
4. prefabricated dry-mix shotcrete according to claim 1, it is characterised in that：The fineness modulus of the middle sand is
The particle of 2.95, grain size 0.2mm are no more than 20%, and clay content is less than 1.0%, moisture content 4-6%, apparent density 2.70g/cm3,
Bulk density is 1495kg/m3。
5. prefabricated dry-mix shotcrete according to claim 1, it is characterised in that：The grain size of the attapulgite is
0.6-0.8μm。
6. prefabricated dry-mix shotcrete according to claim 1, it is characterised in that：The potassium water glass is potassium water glass
Glass K2O·nSiO2, wherein modulus n is 2.60-2.90.
7. prefabricated dry-mix shotcrete according to claim 1, it is characterised in that：When the initial set of the efficient accelerator
Between be 2-3min, the intensity after final setting time 8-10min, 8h is not less than 1MPa, and 28d intensity is not added with accelerator intensity
90%.
8. prefabricated dry-mix shotcrete according to claim 1, it is characterised in that：The water-reducing agent subtracts for naphthalene series high-efficiency
Aqua.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810976597.1A CN108793935B (en) | 2018-08-25 | 2018-08-25 | Precast dry material sprayed concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810976597.1A CN108793935B (en) | 2018-08-25 | 2018-08-25 | Precast dry material sprayed concrete |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108793935A true CN108793935A (en) | 2018-11-13 |
| CN108793935B CN108793935B (en) | 2020-12-11 |
Family
ID=64081125
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| CN201810976597.1A Active CN108793935B (en) | 2018-08-25 | 2018-08-25 | Precast dry material sprayed concrete |
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| CN110845190A (en) * | 2019-09-05 | 2020-02-28 | 中交第二航务工程局有限公司 | Ultrahigh-performance cement-based material applied to wet-process injection construction |
| CN111119202A (en) * | 2020-01-09 | 2020-05-08 | 中铁二局集团有限公司 | Construction method of concrete retaining wall of manual hole digging pile premixed material |
| CZ308680B6 (en) * | 2018-11-21 | 2021-02-17 | České vysoké učení technické v Praze | Sprayed concrete |
| CN115180883A (en) * | 2022-06-23 | 2022-10-14 | 中建五局土木工程有限公司 | Sprayed concrete and preparation method thereof |
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| CN111119202A (en) * | 2020-01-09 | 2020-05-08 | 中铁二局集团有限公司 | Construction method of concrete retaining wall of manual hole digging pile premixed material |
| CN115180883A (en) * | 2022-06-23 | 2022-10-14 | 中建五局土木工程有限公司 | Sprayed concrete and preparation method thereof |
| CN115180883B (en) * | 2022-06-23 | 2023-10-31 | 中建五局土木工程有限公司 | Sprayed concrete and preparation method thereof |
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| CN108793935B (en) | 2020-12-11 |
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