CN110281393A - A kind of ultra-high performance concrete frequency conversion type stirring technique - Google Patents
A kind of ultra-high performance concrete frequency conversion type stirring technique Download PDFInfo
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- CN110281393A CN110281393A CN201910611290.6A CN201910611290A CN110281393A CN 110281393 A CN110281393 A CN 110281393A CN 201910611290 A CN201910611290 A CN 201910611290A CN 110281393 A CN110281393 A CN 110281393A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/02—Controlling the operation of the mixing
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- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The invention patent relates to ultra-high performance concrete stirring technique fields, disclose a kind of frequency conversion type stirring technique of ultra-high performance concrete, prepare a blender；By the blender stirring in fine aggregate and fiber investment step S1, first mix slowly 40-60 seconds, then moderate-speed mixer 40-60 seconds, the mixture stirred evenly；It will stir, first mix slowly 60-80 seconds, then quickly stirring 50-80 seconds, the mixture stirred evenly in mixture in cement and admixture investment step S2；It will continue to stir in the mixture in water and additive investment step S3, first mix slowly 120-150 seconds, then quickly stirring 60-90 seconds, finally mix slowly 30-50 seconds, the ultra-high performance concrete stirred evenly.The application frequency conversion type stirring technique quickly stirs into slurry by frequency conversion technique, reduces air content, the ultra-high performance concrete stirred evenly.
Description
Invention field
The present invention relates to concrete stirring technology technical fields, relate more specifically to a kind of ultra-high performance concrete frequency conversion type
Stirring technique.
Background technique
Variable-frequency control technique started to be widely used in industrial life since China promotes in the 1980s
In production and daily life.The extensive use of variable-frequency control technique mainly has benefited from its excellent energy conservation characteristic and speed regulation
Characteristic.
Traditional stirring technique, concrete stirring be add water using cement, after sandstone dry mixing, additive is once put into
Agitated kettle is stirred, and discharging forms fresh concrete after some time.Advantage is that the equipment realized and process are simple, disadvantage
It is that fresh concrete sandstone surface easily forms one layer of free moisture film, the ratio of mud in interface area is increased, to weaken cement slurry
With the adhesion strength gathered materials, bring the effect of cement slurry far away into play.The even macroscopic come is stirred out in this way
Concrete is put under the microscope, it can be seen that still having the cement granules adhesive aggregation of 10%-30% at small cement group, hydrated cementitious is very
Insufficient, the cement effect of this part is not brought into play.
Ultra-high performance concrete has the characteristics that low water binder ratio, cement consumption are big, is not easy to stir evenly, traditional superelevation
Energy concrete is to improve the mixing quality of ultra-high performance concrete by extending mixing time.Because mixing time is longer, sand
It is very serious to blender liner and stirring blade abrasion with steel fibre.Chinese patent CN203014736U, CN201848919U,
CN202737807U, CN105904591A etc. it is numerous prior art discloses concrete stirring field apply converter technique, but
Influence of the revolving speed to ultra-high performance concrete performance in few whipping process is specifically studied, since every kind of substance of addition has
Reapective features, dispersion, mixing and interaction not realize optimum efficiency under a revolving speed, therefore, in whipping process
Rotational speed optimization may be able to ascend the performance of concrete.
The application combines converter technique with ultra-high performance concrete stirring technique, researches and develops a kind of ultra-high performance concrete
Frequency conversion stirring technique can increase substantially the dispersing uniformity of ultra-high performance concrete, reduce fine aggregate and fiber to stirring
The abrasion of machine liner and stirring blade.
Summary of the invention
It is an object of the invention to solve, conventional ultra high performance concrete mixing time is long, disperses unevenly, to blender
The problems such as wear liner is serious, provide a kind of mixing time it is short, it is high-efficient, be uniformly dispersed, to blender liner and stirring blade
Wear small ultra-high performance concrete frequency conversion type stirring technique.
Above-mentioned purpose of the invention is achieved by the following technical programs:
A kind of ultra-high performance concrete frequency conversion type stirring technique, comprising the following steps:
S1 prepares a blender；
S2 stirs the blender in fine aggregate and fiber investment step S1, first mixes slowly 40-60 seconds, then moderate-speed mixer
40-60 seconds, the mixture stirred evenly；
S3 will be stirred in the mixture in cement and admixture investment step S2, first mix slowly 60-80 seconds, then high-speed stirring
It mixes 50-80 seconds, the mixture stirred evenly；
S4 will continue to stir in the mixture in water and additive investment step S3, first mix slowly 120-150 seconds, then
It high-speed stirred 60-90 seconds, finally mixes slowly 30-50 seconds, the ultra-high performance concrete stirred evenly.
Preferably, in the ultra-high performance concrete frequency conversion type stirring technique, cement is selected from portland cement, admixture choosing
From one of silicon ash, miberal powder, flyash, ceramic polished powder or multiple combinations, fine aggregate is selected from river sand, quartz sand, Machine-made Sand
One of, fiber selects steel fibre, and additive is selected from polycarboxylate water-reducer.
Preferably, in the ultra-high performance concrete frequency conversion type stirring technique, cement, admixture, water, additive, thin bone
Material, fiber mass ratio be 1-4:0.5-3:0.1-3:0.05-0.3:2-6:0.1-2, preferred mass ratio be 2.3-3:1-2:
0.6-1:0.11-0.15:3.5-4.5:0.4-1.2。
Preferably, in the ultra-high performance concrete frequency conversion type stirring technique, the agitator shaft speed mixed slowly is 10-
15rpm, the agitator shaft speed of moderate-speed mixer are 20-36rpm, and the agitator shaft speed quickly stirred is 50-60 rpm.
Preferably, in the ultra-high performance concrete frequency conversion type stirring technique, which is characterized in that the step S1's stirs
Mixing machine includes frequency converter and mixing drum, and mixing drum is provided with inlet port and outlet port.
Compared with prior art, technical solution of the present invention has the advantages that
(1) the application is controlled using the revolving speed that frequency conversion type stirs after various materials are added, and is used in step S2
Moderate-speed mixer again is first mixed slowly, mixes slowly to disperse fiber in fine aggregate, prevents fiber from tying in whipping process
Group, then carries out moderate-speed mixer again and pre-dispersed fiber and fine aggregate is preferably uniformly mixed；It uses in step s3
Quickly stirring again is first mixed slowly, mixes slowly to disperse cement and admixture in mixture, then carries out high speed again
Stirring between pre- various shapes and substance of different sizes so that can preferably be uniformly mixed；It uses first in step s 4 at a slow speed
Stirring, again high-speed stirred finally mix slowly again, and the resistance that mixture stirs into fluidised form state can be reduced by first mixing slowly,
The abrasion of fine aggregate and fiber to mixing plant is reduced, then high-speed stirred improves the dispersion effect and plasticization of mixture, mentions
The mobile performance and quality stability of high mixture shorten the time that ultra-high performance concrete stirs into fluidised form, finally stir at a slow speed
Mixing reduces in mixture because of the gas content that quickly stirring introduces, and reduces the porosity, improves the compactness of ultra-high performance concrete,
To improve the mechanical property and endurance quality of ultra-high performance concrete.
(2) present invention is stirred using frequency conversion type, can reduce energy consumption, is reduced cementitious material and is stirred into the resistance during slurry
Power reduces the abrasion of fine aggregate and fiber to blender liner and paddle, improves the service life of mixing plant.
Detailed description of the invention
Attached drawing 1 is the process flow diagram of the application.
Specific embodiment
Embodiment 1
S1 prepares a blender；
4.0kg quartz sand (about 0.5mm) and 0.8kg steel fibre (about 0.3 × 12mm) are put into the stirring in step S1 by S2
Machine stirring, is first mixed slowly 50 seconds with the speed of 12rpm, then with speed moderate-speed mixer 50 seconds of 28rpm, stirred evenly
Mixture；
S3 will be stirred in the mixture in 2.6kg portland cement (P.O 52.5) and 1.5kg silicon ash investment step S2, first
It is mixed slowly 60 seconds with the speed of 12rpm, then with speed high-speed stirred 50 seconds of 55rpm, the mixture stirred evenly；
S4 will 0.85kg water and 0.13kg polycarboxylate water-reducer investment step S3 in mixture in continue to stir, first with
The speed of 12rpm mixes slowly 120 seconds, then with speed high-speed stirred 60 seconds of 55rpm, is finally stirred at a slow speed with the speed of 12rpm
It mixes 30 seconds, the ultra-high performance concrete stirred evenly.
Embodiment 2
S1 prepares a blender；
3.5kg quartz sand (about 0.5mm) and 1.2kg steel fibre (about 0.3 × 12mm) are put into the stirring in step S1 by S2
Machine stirring, is first mixed slowly 40 seconds with the speed of 15rpm, then with speed moderate-speed mixer 60 seconds of 20rpm, stirred evenly
Mixture；
S3 will be stirred in the mixture in 3.0kg portland cement (P.O 52.5) and 1.0kg silicon ash investment step S2, first
It is mixed slowly 40 seconds with the speed of 15rpm, then with speed high-speed stirred 80 seconds of 50rpm, the mixture stirred evenly；
S4 will 0.6kg water and 0.15kg polycarboxylate water-reducer investment step S3 in mixture in continue to stir, first with
The speed of 15rpm mixes slowly 120 seconds, then with speed high-speed stirred 90 seconds of 50rpm, is finally stirred at a slow speed with the speed of 15rpm
It mixes 30 seconds, the ultra-high performance concrete stirred evenly.
Embodiment 3
S1 prepares a blender；
4.5kg quartz sand (about 0.5mm) and 0.4kg steel fibre (about 0.3 × 12mm) are put into the stirring in step S1 by S2
Machine stirring, is first mixed slowly 60 seconds with the speed of 10rpm, then with speed moderate-speed mixer 40 seconds of 36rpm, stirred evenly
Mixture；
S3 will be stirred in the mixture in 2.3kg portland cement (P.O 52.5) and 2.0kg silicon ash investment step S2, first
It is mixed slowly 80 seconds with the speed of 10rpm, then with speed high-speed stirred 50 seconds of 60rpm, the mixture stirred evenly；
S4 will 1.0kg water and 0.11kg polycarboxylate water-reducer investment step S3 in mixture in continue to stir, first with
The speed of 10rpm mixes slowly 150 seconds, then with speed high-speed stirred 60 seconds of 60rpm, is finally stirred at a slow speed with the speed of 10rpm
It mixes 50 seconds, the ultra-high performance concrete stirred evenly.
Comparative example 1
It is identical as 1 technique of embodiment, but stirred 100 seconds in step S2 using the speed of 28rpm.
Comparative example 2
It is identical as 1 technique of embodiment, but stirred 110 seconds in step S3 using the speed of 55rpm.
Comparative example 3
It is identical as 1 technique of embodiment, but do not use and mix slowly in step S4, directly adopt the speed stirring 180 of 55rpm
Second, finally mixed slowly 30 seconds with the speed of 12rpm.
Comparative example 4
It is identical as 1 technique of embodiment, but the revolving speed of 55rpm is replaced in step S4 using the revolving speed of 36rpm.
Comparative example 5
It is identical as 1 technique of embodiment, but formerly stirred 120 seconds using the speed of 12rpm in step S4, using 55rpm's
Speed stirs 90 seconds, and last speed is not used to mix slowly 30 seconds.
The ultra-high performance concrete stirring technique described in embodiment and comparative example stirring very-high performance mix concrete into
Go air content, the compression strength of standard specimen standard curing 28 days and electric flux test, test data is shown in Table 1:
1 C130 ultra-high performance concrete test data of table
| Number | Air content (%) | Compression strength (MPa) | Electric flux (C) |
| Embodiment 1 | 2.4 | 138.9 | 60 |
| Embodiment 2 | 2.8 | 137.2 | 58 |
| Embodiment 3 | 2.1 | 139.9 | 55 |
| Comparative example 1 | 2.5 | 136.3 | 62 |
| Comparative example 2 | 2.3 | 135.6 | 65 |
| Comparative example 3 | 3.0 | 133.7 | 69 |
| Comparative example 4 | 2.6 | 134.8 | 66 |
| Comparative example 5 | 4.7 | 131.9 | 71 |
From the point of view of table 1, the ultra-high performance concrete that embodiment 1-3 is stirred to get is in air content, compression strength and electric flux
Aspect has a clear superiority, and the frequency conversion type stirring means of specification the application disperse ultra-high performance concrete each component material
More evenly, it is suitble to prepare mechanics and endurance quality more preferably ultra-high performance concrete.Comparative example 1 and comparative example 1 are seen to see
Out, it first carries out mixing slowly the dispersion be conducive between fiber and fine aggregate in step s 2, avoids two kinds of shapes of fiber fine aggregate
Shape differs reunites between biggish solid itself.Comparative example 1 and comparative example 2 are seen to find out, advanced in step s3
Row mixes slowly the dispersion for being conducive to cement and admixture, avoids the reunion of itself of cement and admixture.1 He of comparative example
Comparative example 3 sees that find out, in step s 4, the resistance that mixture stirs into fluidised form state can be reduced by first mixing slowly, and reduces
The abrasion of fine aggregate and fiber to mixing plant, is also beneficial to the pre-dispersed of material, so that liquid phase material is abundant with solid phase material
Infiltration.Comparative example 1 and comparative example 4 are seen to find out, then high-speed stirred improves the dispersion effect and plasticization of mixture, mentions
The mobile performance and quality stability of high mixture shorten the time that ultra-high performance concrete stirs into fluidised form, sufficiently realization liquid
Mixing between body and solid.Comparative example 1 and comparative example 5 see that find out, finally mixing slowly reduces in mixture because of height
The gas content that speed stirring introduces, reduces the porosity, improves the compactness of ultra-high performance concrete, so that it is mixed to improve very-high performance
Coagulate the mechanical property and endurance quality of soil.By above-mentioned test, frequency conversion type stirring technique of the present invention can significantly reduce very-high performance
Concrete mixing time improves mixing uniformity, reduces the porosity, improves ultra-high performance concrete mechanics and endurance quality.
Obviously, above-described embodiment of this patent is only intended to clearly illustrate this patent example, and is not pair
The restriction of the embodiment of this patent.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
Made any modifications, equivalent replacements, and improvements etc., should be included in patent claims within the spirit and principle of patent
Protection scope within.
Claims (5)
1. a kind of ultra-high performance concrete frequency conversion stirring technique, comprising the following steps:
S1 prepares a blender；
S2 stirs the blender in fine aggregate and fiber investment step S1, first mixes slowly 40-60 seconds, then moderate-speed mixer 40-
60 seconds, the mixture stirred evenly；
S3 will be stirred in the mixture in cement and admixture investment step S2, first mix slowly 60-80 seconds, then high-speed stirred
50-80 seconds, the mixture stirred evenly；
S4 will continue to stir in the mixture in water and additive investment step S3, first mix slowly 120-150 seconds, then high-speed stirring
It mixes 60-90 seconds, finally mixes slowly 30-50 seconds, the ultra-high performance concrete stirred evenly.
2. ultra-high performance concrete frequency conversion stirring technique according to claim 1, cement is selected from portland cement, admixture
Selected from one of silicon ash, miberal powder, flyash, ceramic polished powder or multiple combinations, fine aggregate is selected from river sand, quartz sand, mechanism
One of sand, fiber select steel fibre, and additive is selected from polycarboxylate water-reducer.
It is cement, admixture, water, additive, thin 3. ultra-high performance concrete frequency conversion stirring technique according to claim 1
Aggregate, fiber mass ratio be 1-4:0.5-3:0.1-3:0.05-0.3:2-6:0.1-2, preferred mass ratio be 2.3-3:1-2:
0.6-1:0.11-0.15:3.5-4.5:0.4-1.2。
4. ultra-high performance concrete frequency conversion stirring technique according to claim 1, the agitator shaft speed mixed slowly is 10-
15rpm, the agitator shaft speed of moderate-speed mixer are 20-36rpm, and the agitator shaft speed quickly stirred is 50-60rpm.
5. the blender of ultra-high performance concrete frequency conversion stirring technique according to claim 1, the step S1 includes
Frequency converter and mixing drum, mixing drum are provided with inlet port and outlet port.
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Cited By (4)
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| CN111619012A (en) * | 2020-04-28 | 2020-09-04 | 哈尔滨工业大学 | Stirring device and stirring method for ECC material |
| CN112374826A (en) * | 2020-11-16 | 2021-02-19 | 宁波市电力设计院有限公司 | High-performance cement-based material for prefabricated cable trench |
| CN113277877A (en) * | 2021-06-10 | 2021-08-20 | 泗县汉能诚信电气工程有限公司 | BIPV light heat-preservation concrete stirring process |
| CN116945359A (en) * | 2022-04-19 | 2023-10-27 | 保利长大工程有限公司 | Multistage variable frequency stirring method for ultra-high performance concrete |
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