CN103449761B - Hybrid fiber-toughened RPC (reactive powder concrete) and preparation technology - Google Patents
Hybrid fiber-toughened RPC (reactive powder concrete) and preparation technology Download PDFInfo
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- CN103449761B CN103449761B CN201310321057.7A CN201310321057A CN103449761B CN 103449761 B CN103449761 B CN 103449761B CN 201310321057 A CN201310321057 A CN 201310321057A CN 103449761 B CN103449761 B CN 103449761B
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Abstract
The invention discloses hybrid fiber-toughened RPC (reactive powder concrete) and preparation technology, belonging to the technical field of concrete. The hybrid fiber-toughened RPC comprises the following raw materials: 16-19% of common cement and 8-9% of superfine cement based on the total mass of the concrete, 1-3% of steel fiber, 1-1.8% of thick polyolefin fiber and 0.4-0.7% of fine polyvinyl alcohol fiber based on the whole volume of the concrete, admixture, additive and water, wherein the water-binder ratio is 0.17-0.21. The preparation process comprises the following steps: firstly pouring sand and powder and uniformly stirring; adding a solution of the additive and water; when the mixture changes from particles into a colloidal state, adding various kinds of fiber; and stirring until the fiber is uniformly dispersed to obtain the toughened concrete. The three kinds of fiber are distributed disorderly in a matrix, and the characteristics of each kind of fiber can be fully exerted so that the toughening effect is optimal.
Description
Technical field
The present invention relates to a kind of assorted fibre toughening type RPC to prepare, belong to technical field of concrete, be applicable to the concrete works structure that bridge, road, house architectural structure component etc. are higher to toughness reguirements, belong to technical field of concrete.
Background technology
RPC(Reactive Powder Concrete, hereinafter abbreviated as RPC), be a kind of novel high-performance concrete with superstrength, high-durability and volume stability.Due to the difference of its preparation, construction technology, make its mechanical property and deformability all be different from normal concrete and high-strength concrete, comprising: non-coarse aggregate, reduce dimensional defects to greatest extent; Admixture steel fiber, gains in strength and toughness; Use high efficiency water reducing agent, reduce water-cement ratio and porosity; High Temperature Curing, promotes the hydration reaction of gelling material.RPC is applicable to engineering field structure being had to high durable, high-strength and light-weight requirements.But the RPC deformation performance not adding steel fiber is poor, fragility is large, does not almost have sign during destruction.Though mixing of steel fiber has certain performance of resisting cracking, increase toughness of material, and RPC can be made to present certain plasticity, when volume content of steel fibers is very few, do not reach toughness reinforcing effect, and added may cause at most and stir difficulty, the shortcomings such as inner eakiness and cost raising; Simultaneously along with the increase of its intensity, show more obvious hard fragility.
In RPC, toughness provides primarily of the Relative sliding frictional force between steel fiber and matrix, and the size of frictional force is determined by the compaction rate of matrix and the volume of fiber.If add too much steel fiber, matrix density can not get guarantee, poor fluidity, and reduces volume content of steel fibers to ensure density, and the high strength of RPC and toughness do not realize again, and therefore a mixing of steel fiber can not solve the problem improving RPC toughness.If add the fiber of different varieties in RPC, by the toughness utilizing the chemical cohesive force between these fiber and matrixes and mechanical anchoring force can significantly improve RPC.Thick polyolein fiber is a kind of synthon, and intensity is high, good toughness, and raw material sources is wide, preparation is simple, price is lower, be widely used.Thick polyolein fiber diameter is comparatively large, surface is coarse for mutation shape, and between matrix, contact area is large, and mechanical anchoring force is strong, can be good at increasing concrete toughness.But because thick polyolein fiber is hydrophobic material, add that its density is little, and owing to there is no coarse aggregate in RPC, therefore, after building vibration, easy and Matrix separation, affects the distribution of fiber in concrete, thus the advantage of thick polyolein fiber is not in full use, toughening efficiency is not high.Thin polyvinyl alcohol fiber has wetting ability, high strength, higher elasticity modulus and the good advantage such as wear-resisting, antiacid alkali, weathering resistance.Because belonging to hydrophilic material, being combined with the matrix that cement etc. forms comparatively tight, significantly can improving concrete microstructure and improve toughness.Add thin polyvinyl alcohol fiber in RPC, fiber is uniformly distributed the incipient crack that can delay RPC in colloid, increases fracture distribution and power consumption, the final toughness improving RPC.But thin polyvinyl alcohol fiber diameter is little, made of soft, yielding in stirring moulding process, cause the Impact direction of crack place fiber and fiber direction inconsistent, the performance of fiber is not fully utilized, and it is easily agglomerating to mix too much polyvinyl alcohol fiber, therefore toughening effect is restricted.Thick polyolein fiber and thin polyvinyl alcohol fiber are added RPC simultaneously, give full play to the advantage that thin polyvinyl alcohol fiber easily disperses with concrete substrate adhesive property excellence and thick polyolein fiber, also can prevent thin polyvinyl alcohol fiber conglomeration, make the dispersiveness that various fiber keeps good in concrete.Therefore steel fiber, thick polyolein fiber and thin polyvinyl alcohol fiber can be interspersed and mutually supplement, mutually utilize in RPC, give full play to respective characteristic and advantage, finally reach good toughening effect.
Summary of the invention
Thick polyolein fiber diameter is large, surface irregularity, and between matrix, contact area is large, and mechanical anchoring force is strong, can be good at increasing concrete toughness.But because thick polyolein fiber surface has hydrophobicity, density is little, builds in the process of vibrating and is easily separated with matrix, and cause dispersed bad, make its toughening effect not obvious.Thin polyvinyl alcohol fiber has the feature of wetting ability, high strength, higher elasticity modulus, be combined with the matrix that cement etc. forms comparatively tight, there is good dispersiveness in concrete, firm with RPC interfacial adhesion, the incipient crack of RPC can be delayed, realize multiple cracking expansion.But thin polyvinyl alcohol fiber diameter is little, soft, yielding and agglomerating in stirring moulding process, cause the Impact direction of crack place fiber and fiber direction inconsistent, toughening effect is not obvious.Therefore, put into practice through contriver, steel fiber and these two kinds of synthon are joined in RPC according to certain volume volume simultaneously, both the dispersion problem of thick polyolein fiber can have been solved, also make full use of the wetting ability of thin polyvinyl alcohol fiber and the superior feature of interfacial bond property simultaneously, and then the advantage of often kind of fiber is fully used, finally realize the object that RPC is toughness reinforcing.
For achieving the above object, present invention employs following technical scheme:
A technology of preparing of assorted fibre toughening type RPC, is characterized in that: its material component comprises Portland cement, superfine cement, adulterant, admixture, steel fiber, thick polyolein fiber, thin polyvinyl alcohol fiber, water, and wherein water-cement ratio is 0.17 ~ 0.21; Portland cement, superfine cement account for 16% ~ 19%, 8% ~ 9% of concrete total mass respectively; Length of steel fiber is 8 ~ 13mm, diameter is 0.15 ~ 0.25mm; Thick polyolein fiber length is 35 ~ 45mm, diameter is 0.8 ~ 1.3mm; Thin polyvinyl alcohol fiber length is 8 ~ 15mm, diameter is 10 ~ 15 μm; Fibers content is by the percentage calculation accounting for concrete cumulative volume, and steel fiber, thick polyolein fiber, thin polyvinyl alcohol fiber are respectively 1% ~ 3%, 1% ~ 1.8%, 0.4% ~ 0.7% of whole volume of concrete; Adulterant is granulated blast-furnace slag and natural siliceous sand, accounts for 16% ~ 22% of concrete quality, 40% ~ 45% respectively.
Described adulterant is granulated blast-furnace slag and quartz sand, and the specific surface area of slag is 408m
2/ kg.Quartz sand is natural siliceous sand, and quartz sand is 40 ~ 70 orders, and particle diameter is 0.2 ~ 0.4mm.
Described admixture comprises water reducer, defoamer, can improve the material of concrete performance.The volume of water reducer is 1% ~ 1.5% of gelling material quality, and water reducer weight does not comprise the weight of water in water reducer, if water reducer contains water, during calculating, water is wherein converted in the consumption of water.The volume of defoamer is 0.1% ~ 0.5% of gelling material quality.
Described water should meet the regulation of " concrete mixing water supply standard " JGJ63-89.
Described superfine cement specific surface area is preferably 570m
2/ kg.
Described Portland cement specific surface area is preferably 350m
2/ kg.
A preparation method of assorted fibre toughening type RPC, making step comprises as follows:
Stir: pour the sand in raw materials used and powder into stirrer, stirs 1 ~ 2 minute, after even, water and admixture mixing liquid slowly poured in stirrer, pours process control at about 1 minute; When mixture changes colloidal state into by particulate state, uniform mixing of steel fiber, thick polyolein fiber and thin polyvinyl alcohol fiber stir gradually, stir 2 ~ 3 minutes until fiber dispersion evenly after carry out test block and build, and it is shaping to carry out vibrating with shaking table vibratory compaction or employing vibrating spear.
Maintenance: it is 20 ± 2 DEG C that standard leaves standstill maintenance 48h(temperature standard, relative humidity standard is more than 95%), be then 90 degree in temperature, humidity is maintenance 72h under the environment of 95%, and last normal temperature maintenance is to test.
Beneficial effect of the present invention is as follows:
This assorted fibre toughening type RPC, except the characteristic such as high strength, high-durability with general RPC, simultaneously due to the blending of different varieties fiber, the incipient crack of RPC can be delayed, ensure the lasting carrying after RPC cracking, greatly improve the toughness of RPC, there is secondary hardening effect and multiple cracking extended attribute that general fibrous concrete do not have.
The random distribution of three kinds of fibers in matrix, can give full play to the characteristic of often kind of fiber, thus makes toughening effect reach best.In use pass through the change to fibers content, water-cement ratio and optimization, the mechanical toughness of RPC can be improved, and improve economy and the widespread use of material.
Accompanying drawing explanation
Fig. 1 Nemkumar toughness calculates schematic diagram.
Embodiment
Below in conjunction with embodiment, the invention will be further described, but the present invention is not limited to following examples.
Technical scheme
The following typical material mix proportion that embodiment adopts lists in table 1.
Table 1 embodiment material mix proportion
Material for used in form:
Portland cement grade used is PO.42.5;
Quartz sand used is natural siliceous sand, and particle diameter is 0.2 ~ 0.4mm;
Water used meets the regulation of " concrete mixing water supply standard " JGJ 63-89, in upper form water quality by go moisture in admixture after the quality of water;
Steel fiber diameter 0.2mm used, length 13mm, density 7.8 × 10
3kg/m
3, tensile strength reaches 2850MPa;
Thick polyolein fiber diameter 1mm, length 38mm used, density 0.91 × 10
3kg/m
3;
Thin polyvinyl alcohol fiber diameter used is 12 μm, and length is 12mm, density 1.3 × 10
3kg/m
3;
Water reducer used is BASF High-efficiency polycarboxylic acid class water reducer;
Defoamer used is PRS-6 composite anti-foaming agent (liquid).
Its making processes is as follows:
Pour sand and powder into stirrer, slow stirring 2 minutes, evenly, slowly pours into the mixed solution of water and admixture in stirrer, pours time controling at about 1 minute; When mixture changes colloidal state into by particulate state, stir according to the slow uniform mixing of steel fiber of the kind and volume of mixing fiber in embodiment, thick polyolein fiber and thin polyvinyl alcohol fiber, rapid stirring carries out test block and builds after 2 minutes, then vibrate 30 seconds on a vibration table.The test block of building is placed in standard curing room and leaves standstill maintenance 48h, be then 90 degree in temperature, humidity is maintenance 72h under the environment of 95%, and last normal temperature maintenance is to test.
Respectively prepare 3 40mm × 40mm × 160mm test specimen by embodiment 1 ~ 4, adopt microcomputer controlled electronic universal tester to carry out bend ductility test.Nemkumar method processing data is adopted to obtain bend ductility index PCS
m(Post-crack strength) result is beneficial to table 2, PCS
mbe defined as
In formula: E
post, mfor the area under load-deflection curves after peak load; L is the span (getting 100mm) between two bearings; δ is the deflection value that peak load is corresponding; B, h are respectively wide and high (being 40mm) of beam section; L/m is scratching of beam, and L/m> δ, get m=25, as shown in Figure 1.
Toughness index PCS tested by table 2
mvalue
| Numbering | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 |
| PCS m（MPa） | 4.656 | 8.106 | 6.079 | 13.584 |
As can be seen from Table 2, embodiment 2 and embodiment 1 contrast known, the RPC test specimen being mixed with steel fiber and thick polyolein fiber improves 74.1% than the test specimen toughness of a mixing of steel fiber, but by destroying, the breaking section of test specimen is observed and can be found, there is rising phenomenon in thick polyolein fiber, fiber is skewness on surface of fracture; Embodiment 3 and embodiment 1 contrast known, the RPC test specimen being mixed with steel fiber and thin polyvinyl alcohol fiber improves 42.3% than the test specimen toughness of a mixing of steel fiber, the effect improved is not clearly, and after test specimen incipient crack, bearing capacity has a decline of significantly jumping, although bearing capacity underspeeds slowly subsequently, bearing capacity is lower; Embodiment 4 and embodiment 1,2,3 contrast known, add the test specimen of steel fiber, thick polyolein fiber, thin polyvinyl alcohol fiber simultaneously, its toughness improves 191.8%, 67.6%, 123.5% respectively than the test specimen of only mixing of steel fiber, mixing of steel fiber and thick polyolein fiber, mixing of steel fiber and thin polyvinyl alcohol fiber respectively, and toughening effect is obvious especially.In process of the test, even if when test specimen destroys, test specimen also maintains good globality, after crack occurs, depression of bearing force is slow, and has secondary hardening phenomenon and multiple cracking extension feature, and this is the unexistent characteristic of general fibrous concrete.Find that cross-section fibers is evenly distributed by observing breaking section, steel fiber, thick polyolein fiber and thin polyvinyl alcohol fiber are evenly distributed, do not occur the phenomenon that thick polyolein fiber floats, the characteristic of various fiber is fully used, and realizes good toughening effect.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (7)
1. an assorted fibre toughening type RPC, is characterized in that: its material component comprises Portland cement, superfine cement, adulterant, admixture, steel fiber, thick polyolein fiber, thin polyvinyl alcohol fiber, water, and wherein water-cement ratio is 0.17 ~ 0.21; Portland cement, superfine cement account for 16% ~ 19%, 8% ~ 9% of concrete total mass respectively; Length of steel fiber is 8 ~ 13mm, diameter is 0.15 ~ 0.25mm; Thick polyolein fiber length is 35 ~ 45mm, diameter is 0.8 ~ 1.3mm; Thin polyvinyl alcohol fiber length is 8 ~ 15mm, diameter is 10 ~ 15 μm; Fibers content is by the percentage calculation accounting for concrete cumulative volume, and steel fiber, thick polyolein fiber, thin polyvinyl alcohol fiber are respectively 1% ~ 3%, 1% ~ 1.8%, 0.4% ~ 0.7% of whole volume of concrete; Adulterant is granulated blast-furnace slag and natural siliceous sand, accounts for 16% ~ 22% of concrete quality, 40% ~ 45% respectively.
2. according to a kind of assorted fibre toughening type RPC of claim 1, it is characterized in that, described adulterant is granulated blast-furnace slag and natural siliceous sand, and the specific surface area of slag is 408m
2/ kg.
3., according to a kind of assorted fibre toughening type RPC of claim 1, it is characterized in that, quartz sand is natural siliceous sand, and quartz sand is 40 ~ 70 orders, and particle diameter is 0.2 ~ 0.4mm.
4. according to a kind of assorted fibre toughening type RPC of claim 1, it is characterized in that, described admixture comprises water reducer, defoamer, the volume of water reducer is 1% ~ 1.5% of gelling material quality, water reducer weight does not comprise the weight of water in water reducer, if water reducer contains water, during calculating, water is wherein converted in the consumption of water; The volume of defoamer is 0.1% ~ 0.5% of gelling material quality.
5., according to a kind of assorted fibre toughening type RPC of claim 1, it is characterized in that, described superfine cement specific surface area is preferably 570m
2/ kg.
6., according to a kind of assorted fibre toughening type RPC of claim 1, it is characterized in that, described Portland cement specific surface area is preferably 350m
2/ kg.
7. the method for any the assorted fibre toughening type RPC of preparation described in claim 1-6, is characterized in that, comprise the following steps:
Stir: pour the sand in raw materials used and powder into stirrer, stirs 1 ~ 2 minute, after even, water and admixture mixing liquid slowly poured in stirrer, pours process control at 1 minute; When mixture changes colloidal state into by particulate state, uniform mixing of steel fiber, thick polyolein fiber and thin polyvinyl alcohol fiber stir gradually, stir 2 ~ 3 minutes until fiber dispersion evenly after carry out test block and build, and it is shaping to carry out vibrating with shaking table vibratory compaction or employing vibrating spear;
Maintenance: standard leaves standstill maintenance 48h, be then 90 DEG C in temperature, humidity is maintenance 72h under the environment of 95%.
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| CN103880314B (en) * | 2014-02-23 | 2018-04-10 | 中国科学院福建物质结构研究所 | A kind of forming method of fibre reinforced concrete |
| CN105585294B (en) * | 2015-11-13 | 2018-02-27 | 北京中企卓创科技发展有限公司 | A kind of high cracking resistance high tenacity airport pavement concrete of assorted fibre and preparation method |
| CN105622014A (en) * | 2015-12-28 | 2016-06-01 | 郑州大学 | Multi-strength regeneration brick aggregate fiber concrete and preparing method thereof |
| CN106965329B (en) * | 2017-05-18 | 2023-10-03 | 郑州市浩瑞佳机械制造有限公司 | Reactive powder concrete mixing plant |
| CN108501172B (en) * | 2018-04-18 | 2020-03-24 | 上海市建筑科学研究院 | Forming method of large-mixing-amount short-cut synthetic fine fiber concrete |
| CN108314388A (en) * | 2018-05-11 | 2018-07-24 | 安徽砼宇特构科技有限公司 | A kind of fibre reinforced concrete material and preparation method thereof |
| CN111153647A (en) * | 2019-12-31 | 2020-05-15 | 江苏丹凤建筑集成化科技有限公司 | Preparation method of energy-saving concrete prefabricated part |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1580407A (en) * | 2003-08-15 | 2005-02-16 | 深圳市海川实业股份有限公司 | Fiber-mixed cement-concrete road surface |
| CN102775099A (en) * | 2012-07-30 | 2012-11-14 | 北京工业大学 | Economic active powder concrete mixed superfine cement |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1580407A (en) * | 2003-08-15 | 2005-02-16 | 深圳市海川实业股份有限公司 | Fiber-mixed cement-concrete road surface |
| CN102775099A (en) * | 2012-07-30 | 2012-11-14 | 北京工业大学 | Economic active powder concrete mixed superfine cement |
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