CN104973839A - Self-stress and self-compacting fiber concrete and preparation method thereof - Google Patents
Self-stress and self-compacting fiber concrete and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a self-stress and self-compacting fiber concrete and a preparation method thereof. The preparation method comprises the following steps: (1) adding awater reducer or the water reducer and the thickening agent into water at the same time and stirring evenly; (2) feeding coarse aggregate and fine aggregate according to a ratio into a stirring barrel and evenly stirring; (3) adding fibers according to a certain ratio into an evenly mixed coarse aggregate-fine aggregate mixture and stirring so that the fibers can be evenly dispersed; (4) feeding cement or cement and a mineral additive into the stirring barrel according to a certain ratio and evenly stirring; and (5) feeding water doped with an additive obtained in the step (1) into the mixture obtained in the step (4), stirring evenly and discharging, thus obtaining the self-stress and self-compacting fiber concrete. According to the self-stress and self-compacting fiber concrete and the preparation method thereof, expansion of microcracks and generation of macro-cracks inside core concrete can be effectively inhibited, tensile strength, flexure strength, toughness, shock resistance and fatigue resistance of the core concrete can be improved, brittleness of the core concrete can be obviously reduced, and ductility of components can be enhanced.
Description
Technical field
The present invention relates to building structural materials technical field, specifically a kind of concrete filled steel tube Concrete Filled material and preparation method thereof.
Background technology
Concrete filled steel tube is a kind of unitized construction of superior performance, and its good performance comes from steel pipe and concrete interaction in loading process, i.e. constraint and supporting role.Therefore, following requirement is had for core concrete:
(1) concrete is convenient to build, and is easy to ensure pouring quality and good interface performance;
(2) core concrete shrinks less, and guarantee steel pipe and concrete are in short-term and all have good constraint and supporting role for a long time;
(3) there is higher intensity and good deformability, meet the requirement of modern structure heavy duty, greatly usage space and good anti-seismic performance.
Existingly to mainly contain for the concrete material in concrete filled steel tube: normal concrete, high-strength concrete, self-compacting concrete, self-stressing concrete and fibrous concrete etc.
All there is defect in various degree in aforementioned all kinds of concrete:
1, regular tenacity concrete is cheap, is widely used, but along with the increase of building structure height and the increase of load, according to regular tenacity concrete, scantling is comparatively large, waste structure usage space, and economic benefit is lower;
2, high-strength concrete has higher supporting capacity, saves building structure usage space, but along with the raising of intensity, material fragility increases, and is unfavorable for the anti-seismic performance of concrete filled steel tube;
3, the high performance concrete of self-compacting concrete to be a kind of with serviceability be leading indicator, complicated at concrete filled steel tube, arrangement of reinforcement is closeer and still can obtain good density when being difficult to vibrate.But there is larger contraction, be unfavorable for giving full play to superior composite behaviour;
4, self-stressing concrete obtains a kind of concrete by adopting self-stressing cement or mix swelling agent in Portland cement, only could obtain superior performance under suitable constraint condition.Under external constraint condition (as steel pipe), the intensity of self-stressing concrete and degree of compactness can be greatly improved, but its deformability also can be caused to decline, and the deformability of corresponding steel tube-concrete composite structure declines;
5, fibrous concrete has the deformability and fire resistance etc. that are obviously better than plain concrete, and the fiber simultaneously mixing some kind also can reduce the contraction of inner concrete, contributes to the performance improving unitized construction.But the effect of fiber is subject to the impact of fiber dispersion degree, in the concrete that serviceability is general, the degree of scatter of fiber is difficult to ensure, now not only can increase and build difficulty, and disperse uneven fiber to the decline causing concrete performance.
Summary of the invention
The object of this invention is to provide a kind of fiber seif-citing rate self-compacting concrete and preparation method thereof, this material work is functional, the contraction of core concrete, there is higher tension, bending resistance and the performance such as ultimate compression strength and good toughness, shock resistance and fire-resistance, compensate the concrete contraction of core in concrete filled steel tube, improve steel pipe and concrete interaction.
Fiber seif-citing rate self-compacting concrete of the present invention, its component and Amount per unitvolume are:
Also containing fiber in this component, the volume ratio of fiber add-on and concrete blending ingredients is 0 ~ 1.2%;
Also containing water reducer in this component, the weight ratio of water reducer add-on and water is 0.8-4.75%.
Described cement is one or more in silicate self-stressing cement, sulplo-aluminate self-stressing cement, aluminate self-stressing cement; Sand is medium sand; The grating of stone is 5-15mm continuous grading; Described fiber is the mixture of one or more in steel fiber, synthon, steel fiber, synthon; Water reducer is poly carboxylic acid series water reducer.
The preparation method of described fiber seif-citing rate self-compacting concrete, comprises the steps:
Step 1, chooses medium sand as fine aggregate, selects diameter at 5 ~ 15mm grating continuous print stone as coarse aggregate;
Step 2, is proportionally added to the water water reducer or water reducer and thickening material simultaneously and stirs;
Step 3, proportionally drops in agitation vat stir thick, fine aggregate;
Step 4, proportionally to add fiber in thick, the fine aggregate mixture stirred and stirs and make fiber dispersion even;
Step 5, proportionally drops into cement or cement and mineral admixture in agitation vat and stirs;
Step 6, the water being mixed with admixture step 2 obtained adds in the mixture that step 5 obtains, and after stirring, i.e. discharging, prepares fiber seif-citing rate self-compacting concrete.
In described step 3, churning time that is thick, fine aggregate is 30s-45s.
In described step 4, adding the churning time after fiber is 60s-90s.
In described step 5, described mineral admixture is flyash and/or silicon ash, and the consumption of mineral admixture is 0 ~ 170kg/m
3, the churning time dropped into after cement or cement and mineral admixture is 60s-90s.
In described step 6, adding the churning time be mixed with after the water of admixture that step 2 obtains is 120s-150s.
The advantage of a kind of fiber seif-citing rate of the present invention self-compacting concrete and preparation method thereof is:
(1) good serviceability: the self-compacting ability of concrete material of the present invention makes it have good mobility, stability and anti-segregation ability, without the need to vibrating, just there is good homogeneity and degree of compactness, solving in concrete construction difficulty of vibrating, concrete quality be difficult to ensure shortcoming; Good serviceability makes the distribution of fiber in concrete substrate more even, gives full play to the effects such as the activeness and quietness of fiber;
(2) seif-citing rate compensate for shrinkage, improve composite behaviour: the expansion character of concrete material of the present invention not only can compensating concrete shrinkage strain, and under the effect of contraction of extraneous (as steel pipe), core concrete was just subject to sidewise restraint before stressed, interaction between steel pipe and core concrete just exists before loading starts, and exist all the time in whole loading procedure, improve steel pipe and concrete combined effect;
(3) fiber provides three-dimensional to retrain, reduce the decline of concrete strength, improve material fragility: after fiber mixes concrete material matrix of the present invention, fiber plays dual parts adjustment crystal contact face and stops that crystal grain is swollen moves, make core concrete internal structure more closely knit, significantly improve fiber and concrete interfacial bond property, make fiber have better reinforced effects.
The three-dimensional random distribution of fiber makes seif-citing rate being more evenly distributed in concrete substrate, and reduces the decline of intensity that concrete causes due to dilatational strain and degree of compactness; Fiber can improve the early-age plastic shrinkage of self-stressing concrete matrix, and provides constraint in early days in concrete hardening, reduces seif-citing rate loss.
The present invention effectively can stop the inner expansion of microfracture of core concrete and the generation of macroscopic fracture, improve the tensile strength of core concrete, bending strength, toughness, shock resistance and anti-fatigue ability, the remarkable fragility improving core concrete, improves the ductility of component.
Embodiment
Below by embodiment, technical scheme of the present invention is described in further detail.
Embodiment one
A kind of fiber seif-citing rate of the present invention self-compacting concrete and preparation method thereof, its method comprises the steps:
Step 1, chooses medium sand as fine aggregate, selects diameter at 5 ~ 15mm, and grating continuous print stone is as coarse aggregate;
Step 2, to mix in 247.5kg water (mass ratio 1.08%:1) and stirs for subsequent use by 2.67kg polycarboxylate high performance water-reducing agent;
Step 3, drops in agitation vat stir 30s by 634.1kg medium sand and 730.5kg stone (mass ratio is 1:1.15);
Step 4, steel fiber in a row that 47.1kg high-quality is bondd (according to being 0.6%:1 with concrete volume ratio) add stirred medium sand, stir 60s and make it be uniformly dispersed in stone mixture;
Step 5, makes differing materials mix by stirring 60s in 750kg sulplo-aluminate self-stressing cement input agitation vat;
Step 6, adds in said mixture by the water (water cement ratio is 0.33) being mixed with admixture in step 2, is discharging, prepares steel fiber seif-citing rate self-compacting concrete after stirring 120s.
Embodiment two
A kind of fiber seif-citing rate of the present invention self-compacting concrete and preparation method thereof, its method comprises the steps:
Step 1, chooses medium sand as fine aggregate, selects diameter at 5 ~ 15mm, and grating continuous print stone is as coarse aggregate;
Step 2, to add in 247.5kg water (mass ratio 1.5%:1) and stirs for subsequent use by 3.66kg polycarboxylate high performance water-reducing agent;
Step 3, drops in agitation vat by 634.1kg medium sand and 729kg stone stir 45s according to (mass ratio 1:1.15), stir;
Step 4, steel fiber in a row that 94.2kg high-quality is bondd (be 1.2%:1 with concrete volume ratio) add stirred medium sand, stir 90s and make it be uniformly dispersed in stone mixture;
Step 5, makes differing materials mix by stirring 90s in 750kg sulplo-aluminate self-stressing cement input agitation vat;
Step 6, adds in said mixture by the water (water cement ratio is 0.33) being mixed with admixture in step 2, is discharging, prepares steel fiber seif-citing rate self-compacting concrete after stirring 150s.
Embodiment three
A kind of fiber seif-citing rate of the present invention self-compacting concrete and preparation method thereof, its method comprises the steps:
Step 1, chooses medium sand as fine aggregate, selects diameter at 5 ~ 15mm, and grating continuous print stone is as coarse aggregate;
Step 2, to add in 172.5kg water (mass ratio 3.6%:1) and stirs for subsequent use by 6.24kg polycarboxylate high performance water-reducing agent;
Step 3, drops in agitation vat stir 40s by 806kg medium sand and 814kg stone (mass ratio is 1:1), stir;
Step 4, steel fiber in a row that 47.1kg high-quality is bondd (be 0.6%:1 with concrete volume ratio) add stirred medium sand, stir 70s and make it be uniformly dispersed in stone mixture;
Step 5, makes differing materials mix by stirring 60s in 750kg sulplo-aluminate self-stressing cement input agitation vat;
Step 6, adds in said mixture by the water (water cement ratio is 0.23) being mixed with admixture in step 2, is discharging, prepares steel fiber seif-citing rate self-compacting concrete after stirring 120s.
Embodiment four
A kind of fiber seif-citing rate of the present invention self-compacting concrete and preparation method thereof, its method comprises the steps:
Step 1, chooses medium sand as fine aggregate, selects diameter at 5 ~ 15mm, and grating continuous print stone is as coarse aggregate;
Step 2, to add in 172.5kg water (mass ratio is 4.75%:1) and stirs by 8.19kg polycarboxylate high performance water-reducing agent;
Step 3, drops in agitation vat stir 30s by 806kg medium sand and 814kg stone (mass ratio is 1:1), stir;
Step 4, steel fiber in a row that 94.2kg high-quality is bondd (be 1.2%:1 with concrete volume ratio) add stirred medium sand, stir 80s and make it be uniformly dispersed in stone mixture;
Step 5, makes differing materials mix by stirring 90s in 750kg sulplo-aluminate self-stressing cement input agitation vat;
Step 6, adds in said mixture by the water (water cement ratio is 0.23) being mixed with admixture in step 2, is discharging, prepares steel fiber seif-citing rate self-compacting concrete after stirring 150s.
Embodiment five
A kind of fiber seif-citing rate of the present invention self-compacting concrete and preparation method thereof, its method comprises the steps:
Step 1, chooses medium sand as fine aggregate, selects diameter at 5 ~ 15mm, and grating continuous print stone is as coarse aggregate;
Step 2, to add in 210kg water (mass ratio 2.5%:1) and stirs by 5.14kg polycarboxylate high performance water-reducing agent;
Step 3, drops in agitation vat stir 45s by 675.8kg medium sand and 756.0kg stone (mass ratio is 1:1.12), stir;
Step 4, steel fiber in a row that 70.6kg high-quality is bondd, 0.018kg polypropylene fibre (with concrete volume ratio 0.9%:0.02%:1) add stirred medium sand, stir 60s and make it be uniformly dispersed in stone mixture;
Step 5, makes differing materials mix by stirring 60s in 750kg sulplo-aluminate self-stressing cement input agitation vat;
Step 6, adds in said mixture by the water (water cement ratio is 0.28) being mixed with admixture in step 2, is discharging, prepares steel fiber seif-citing rate self-compacting concrete after stirring 120s.
Embodiment six
A kind of fiber seif-citing rate of the present invention self-compacting concrete and preparation method thereof, its method comprises the steps:
Step 1, chooses medium sand as fine aggregate, selects diameter at 5 ~ 15mm, and grating continuous print stone is as coarse aggregate;
Step 2, to add in 170kg water (mass ratio is 4.41%:1) and stirs by 7.51kg polycarboxylate high performance water-reducing agent;
Step 3, drops in agitation vat stir 30s by 765kg medium sand and 790kg stone (mass ratio is 0.97:1), stir;
Step 4, steel fiber in a row that 94.2kg high-quality is bondd (be 1.2%:1 with concrete volume ratio) add stirred medium sand, stir 80s and make it be uniformly dispersed in stone mixture;
Step 5, makes differing materials mix by stirring 90s in 700kg sulplo-aluminate self-stressing cement and 70kg first level flour coal ash input agitation vat;
Step 6, adds in said mixture by the water (water cement ratio is 0.23) being mixed with admixture in step 2, is discharging, prepares steel fiber seif-citing rate self-compacting concrete after stirring 150s.
Embodiment seven
A kind of fiber seif-citing rate of the present invention self-compacting concrete and preparation method thereof, its method comprises the steps:
Step 1, chooses medium sand as fine aggregate, selects diameter at 5 ~ 15mm, and grating continuous print stone is as coarse aggregate;
Step 2, to add in 250.0kg water (water reducer and quality are than being 0.5%:1) and stirs for subsequent use by 1.25kg polycarboxylate high performance water-reducing agent and 0.04kg thickening material;
Step 3, drops in agitation vat stir 45s by 650.1kg medium sand and 730kg stone (mass ratio 1:1.12), stir;
Step 4,0.045kg polypropylene fibre (be 0.05%:1 with concrete volume ratio) is added stirred medium sand, stir 90s and make it be uniformly dispersed in stone mixture;
Step 5, makes differing materials mix by stirring 90s in 680kg sulplo-aluminate self-stressing cement and 50kg silicon ash input agitation vat;
Step 6, adds in said mixture by the water (water cement ratio is 0.35) being mixed with admixture in step 2, is discharging, prepares polypropylene fibre seif-citing rate self-compacting concrete after stirring 150s.
Following table is the performance test contrast table of the concrete material that above seven embodiments prepare.
| Embodiment | T 500(s) | D(mm) | Mobility is observed | Fiber dispersion situation | f cu(MPa) | E c(GPa) |
| 1 | 1 | 630 | Well, slurry is rarer | Evenly | 53.3 | 37.4 |
| 2 | 2 | 610 | Well, slurry modest viscosity | Evenly | 51.6 | 32.5 |
| 3 | 3 | 620 | Well, slurry thickness | More even | 69.2 | 41.5 |
| 4 | 4 | 600 | Better, slurry thickness | More even | 60.1 | 33.1 |
| 5 | 5 | 600 | Well, slurry thickness | More even | 65.1 | 31.8 |
| 6 | 5 | 620 | Well, slurry thickness | More even | 63.5 | 32.4 |
| 7 | 2 | 650 | Well, slurry modest viscosity | Evenly | 45.5 | 35.6 |
In table, D represents outer diameter of steel pipes, T
500for time when slump flow test reaches 500mm, f
curepresent concrete strength, E
crepresent modulus of elasticity of concrete.
Claims (7)
1. a fiber seif-citing rate self-compacting concrete, is characterized in that its component and Amount per unitvolume are:
Also containing fiber in this component, the volume ratio of fiber add-on and concrete blending ingredients is 0 ~ 1.2%;
Also containing water reducer in this component, the weight ratio of water reducer add-on and water is 0.8-4.75%.
2. fiber seif-citing rate self-compacting concrete as claimed in claim 1, is characterized in that: described cement is one or more in silicate self-stressing cement, sulplo-aluminate self-stressing cement, aluminate self-stressing cement; Sand is medium sand; The grating of stone is 5-15mm continuous grading; Described fiber is the mixture of one or more in steel fiber, synthon, steel fiber, synthon; Water reducer is poly carboxylic acid series water reducer.
3. the preparation method of fiber seif-citing rate self-compacting concrete as claimed in claim 1 or 2, is characterized in that comprising the steps:
Step (1), chooses medium sand as fine aggregate, selects diameter at 5 ~ 15mm grating continuous print stone as coarse aggregate;
Step (2), is proportionally added to the water water reducer or water reducer and thickening material simultaneously and stirs;
Step (3), proportionally drops in agitation vat stir thick, fine aggregate;
Step (4), proportionally to add fiber in thick, the fine aggregate mixture stirred and stirs and make fiber dispersion even;
Step (5), proportionally drops into cement or cement and mineral admixture in agitation vat and stirs;
Step (6), added by the water being mixed with admixture that step (2) obtains in the mixture that step (5) obtains, after stirring, i.e. discharging, prepares fiber seif-citing rate self-compacting concrete.
4. preparation method as claimed in claim 3, is characterized in that: in described step (3), and churning time that is thick, fine aggregate is 30s-45s.
5. preparation method as claimed in claim 3, it is characterized in that: in described step (4), adding the churning time after fiber is 60s-90s.
6. preparation method as claimed in claim 3, is characterized in that: in described step (5), and described mineral admixture is flyash and/or silicon ash, and the consumption of mineral admixture is 0 ~ 170kg/m
3, the churning time dropped into after cement or cement and mineral admixture is 60s-90s.
7. preparation method as claimed in claim 3, is characterized in that: in described step (6), and adding the churning time be mixed with after the water of admixture that step (2) obtains is 120s-150s.
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Cited By (8)
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| CN105859213A (en) * | 2016-03-30 | 2016-08-17 | 四川华西绿舍建材有限公司 | Steel fiber concrete with high fracture resistance and preparation method thereof |
| CN106593003A (en) * | 2016-12-23 | 2017-04-26 | 武汉大学 | Method for reinforcing steel pipe column through external-sleeving square steel pipe concrete |
| CN106593004A (en) * | 2016-12-23 | 2017-04-26 | 武汉大学 | Method for reinforcing steel pipe column in a composite mode through external-sleeving square steel pipe concrete and fiber composite materials |
| CN106677552A (en) * | 2016-12-23 | 2017-05-17 | 武汉大学 | Method for solidifying steel pipe column through external sleeveing of circular steel pipe concrete |
| CN106677551A (en) * | 2016-12-23 | 2017-05-17 | 武汉大学 | Method for compositely strengthening steel pipe column through external sleeveing of circular steel pipe concrete fibre composite materials |
| CN109369116A (en) * | 2018-12-19 | 2019-02-22 | 广东工业大学 | A kind of self-compacting concrete and preparation method thereof |
| CN109867496A (en) * | 2017-12-04 | 2019-06-11 | 东北林业大学 | A kind of assorted fibre activeness and quietness High-strength self-compaction concrete and preparation method thereof |
| CN110981336A (en) * | 2019-11-29 | 2020-04-10 | 上海建工集团股份有限公司 | Large-volume concrete with pre-applied internal stress and preparation method thereof |
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| CN104291760A (en) * | 2014-09-26 | 2015-01-21 | 吉林大学 | High-expansion cement-based composite material and preparation method thereof |
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| CN1399043A (en) * | 2002-08-30 | 2003-02-26 | 蒋元海 | Process of making manhole cover of chemical pre-stressed steel fiber reinforced concrete |
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| CN105859213A (en) * | 2016-03-30 | 2016-08-17 | 四川华西绿舍建材有限公司 | Steel fiber concrete with high fracture resistance and preparation method thereof |
| CN106593003A (en) * | 2016-12-23 | 2017-04-26 | 武汉大学 | Method for reinforcing steel pipe column through external-sleeving square steel pipe concrete |
| CN106593004A (en) * | 2016-12-23 | 2017-04-26 | 武汉大学 | Method for reinforcing steel pipe column in a composite mode through external-sleeving square steel pipe concrete and fiber composite materials |
| CN106677552A (en) * | 2016-12-23 | 2017-05-17 | 武汉大学 | Method for solidifying steel pipe column through external sleeveing of circular steel pipe concrete |
| CN106677551A (en) * | 2016-12-23 | 2017-05-17 | 武汉大学 | Method for compositely strengthening steel pipe column through external sleeveing of circular steel pipe concrete fibre composite materials |
| CN109867496A (en) * | 2017-12-04 | 2019-06-11 | 东北林业大学 | A kind of assorted fibre activeness and quietness High-strength self-compaction concrete and preparation method thereof |
| CN109867496B (en) * | 2017-12-04 | 2021-08-24 | 东北林业大学 | Hybrid fiber reinforced and toughened high-strength self-compacting concrete and preparation method thereof |
| CN109369116A (en) * | 2018-12-19 | 2019-02-22 | 广东工业大学 | A kind of self-compacting concrete and preparation method thereof |
| CN109369116B (en) * | 2018-12-19 | 2021-08-13 | 广东工业大学 | Self-compacting concrete and preparation method thereof |
| CN110981336A (en) * | 2019-11-29 | 2020-04-10 | 上海建工集团股份有限公司 | Large-volume concrete with pre-applied internal stress and preparation method thereof |
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Application publication date: 20151014 |