CN103449761A - 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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- CN103449761A CN103449761A CN2013103210577A CN201310321057A CN103449761A CN 103449761 A CN103449761 A CN 103449761A CN 2013103210577 A CN2013103210577 A CN 2013103210577A CN 201310321057 A CN201310321057 A CN 201310321057A CN 103449761 A CN103449761 A CN 103449761A
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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 preparation, belong to the concrete technology field, be applicable to the concrete works structure that bridge, road, house architectural structure member etc. are higher to toughness reguirements, belong to the concrete technology field.
Background technology
RPC(Reactive Powder Concrete, below be abbreviated as RPC), be a kind of novel high-performance concrete with superstrength, high-durability and volume stability.Difference due to its preparation, construction technology, make its mechanical property and deformability all be different from normal concrete and high-strength concrete, and comprising: non-coarse aggregate reduces dimensional defects to greatest extent; The admixture steel fiber, gain in strength and toughness; Use high efficiency water reducing agent, reduce water-cement ratio and porosity; High Temperature Curing, the hydration reaction of promotion gelling material.RPC is applicable to that structure is had to the engineering field that height is durable, high-strength and lightweight requires.But the RPC deformation performance that does not add steel fiber is poor, fragility is large, almost there is no sign during destruction.Though mixing of steel fiber has certain performance of resisting cracking, increase toughness of material, and can make RPC present certain plasticity, when volume content of steel fibers is very few, do not reach toughness reinforcing effect, stirred difficulty and add may cause at most, the shortcomings such as inner eakiness and cost raising; Along with the increase of its intensity, show more obvious hard fragility simultaneously.
In RPC, toughness is mainly provided with the relative sliding friction power between matrix by steel fiber, 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, the matrix density can not get ensureing, poor fluidity, and reduces volume content of steel fibers to guarantee density, and the high strength of RPC and toughness do not realize again, so a mixing of steel fiber can not solve the problem that improves RPC toughness.If add the fiber of different varieties in RPC, by the toughness of utilizing chemical cohesive force between these fibers and matrix 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 large, surface is mutation shape and coarse, 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 in RPC owing to there is no coarse aggregate, therefore after building vibration, easy and Matrix separation, affect the distribution of fiber in concrete, thereby the advantage of thick polyolein fiber is not in full use, and toughening efficiency is not high.Thin polyvinyl alcohol fiber has the advantages such as wetting ability, high strength, higher elasticity modulus and good wear-resisting, antiacid alkali, weathering resistance.Because belonging to hydrophilic material, with the matrix of compositions such as cement, be combined comparatively closely, can significantly improve concrete microstructure and raising 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, finally improves the toughness of RPC.But thin polyvinyl alcohol fiber diameter is little, material is soft, yielding in stirring moulding process, cause crack place fiber be subject to force direction and fiber direction inconsistent, the performance of fiber is not fully utilized, and it is easily agglomerating to mix too much polyvinyl alcohol fiber, so toughening effect is restricted.Thick polyolein fiber and thin polyvinyl alcohol fiber are added to RPC simultaneously, give full play to the advantage that the excellent and thick polyolein fiber of thin polyvinyl alcohol fiber and concrete substrate adhesive property easily disperses, also can prevent thin polyvinyl alcohol fiber conglomeration, make various fibers keep good dispersiveness 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 characteristic and advantage separately, 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 easily separates with matrix, and cause dispersiveness bad, makes its toughening effect not obvious.Thin polyvinyl alcohol fiber has the characteristics of wetting ability, high strength, higher elasticity modulus, be combined comparatively closely with the matrix of the composition such as cement, there is good dispersiveness in concrete, firm with RPC interface bonding, can delay the incipient crack of RPC, realize the multiple cracking expansion.But thin polyvinyl alcohol fiber diameter is little, soft, yielding and agglomerating in stirring moulding process, cause in crack, locate fiber be subject to force direction and fiber direction inconsistent, toughening effect is not obvious.Therefore, through the contriver, put into practice, by steel fiber and these two kinds of synthon, according to certain volume volume, join in RPC simultaneously, both can solve the dispersion problem of thick polyolein fiber, also take full advantage of wetting ability and the superior characteristics of interfacial bond property of thin polyvinyl alcohol fiber simultaneously, and then the advantage of every kind of fiber is fully used, finally realize the purpose that RPC is toughness reinforcing.
For achieving the above object, the present invention has adopted following technical scheme:
The technology of preparing of a kind 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 respectively 16%～19%, 8%～9% of concrete total mass; Length of steel fiber is that 8～13mm, diameter are 0.15～0.25mm; Thick polyolein fiber length is that 35～45mm, diameter are 0.8～1.3mm; Thin polyvinyl alcohol fiber length is that 8～15mm, diameter are 10～15 μ m; Fibers content is by the percentage calculation that accounts for the 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 respectively 16%～22%, 40%～45% of concrete quality.
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.
The preparation method of a kind of assorted fibre toughening type RPC, making step comprises as follows:
Stir: the sand in raw materials used and powder are poured into to stirrer, stir 1～2 minute, even after, water and admixture mixing liquid are slowly poured in stirrer, pour process control into about 1 minute; When mixture changes colloidal state into by particulate state, mixing of steel fiber, thick polyolein fiber and thin polyvinyl alcohol fiber are stirred uniformly gradually, stir and within 2～3 minutes, until fiber dispersion, carry out test block after evenly and build, and with the moulding of being vibrated of shaking table vibratory compaction or employing vibrating spear.
Maintenance: the standing maintenance 48h(of standard temperature standard is 20 ± 2 ℃, and the relative humidity standard is more than 95%), in temperature, be then 90 degree, maintenance 72h under the environment that humidity is 95%, last normal temperature maintenance is to test.
Beneficial effect of the present invention is as follows:
This assorted fibre toughening type RPC, except characteristics such as the high strength with general RPC, high-durabilities, while is due to the blending of different varieties fiber, can delay the incipient crack of RPC, guarantee the lasting carrying after RPC ftractures, greatly improve the toughness of RPC, there is secondary hardening effect and multiple cracking extended attribute that general fibrous concrete does not have.
The random distribution of three kinds of fibers in matrix, can give full play to the characteristic of every kind of fiber, thereby make toughening effect reach best.In use, by change and optimization to fibers content, water-cement ratio, the mechanical toughness of RPC be can improve, and economy and the widespread use of material improved.
The accompanying drawing explanation
Fig. 1 Nemkumar toughness is calculated 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 is listed in table 1.
Table 1 embodiment material mix proportion
For material 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, and in upper form, the quality of water is the quality of the water after moisture in admixture;
Steel fiber diameter 0.2mm used, length 13mm, density 7.8 * 10
3kg/m
3,, tensile strength reaches 2850MPa;
Thick polyolein fiber diameter 1mm used, length 38mm, density 0.91 * 10
3kg/m
3;
Thin polyvinyl alcohol fiber diameter used is 12 μ m, and length is 12mm, density 1.3 * 10
3kg/m
3;
Water reducer used is the efficient polycarboxylic acids dehydragent of BASF;
Defoamer used is the compound defoamer of PRS-6 (liquid).
Its making processes is as follows:
Pour sand and powder into stirrer, stir slowly 2 minutes, evenly after, the mixed solution of water and admixture is slowly poured in stirrer, the time of pouring into was controlled at about 1 minute; When mixture changes colloidal state into by particulate state, according to the kind of mixing fiber in embodiment and the slowly uniform mixing of steel fiber of volume, thick polyolein fiber and thin polyvinyl alcohol fiber, stirred, rapid stirring carries out test block after 2 minutes builds, and then on shaking table, vibrates 30 seconds.The test block of building is placed on to standing maintenance 48h in standard curing room, is then 90 degree in temperature, maintenance 72h under the environment that humidity is 95%, and last normal temperature maintenance is to test.
Respectively prepare 3 40mm * 40mm * 160mm test specimen with embodiment 1～4, adopted microcomputer controlled electronic universal tester to carry out the bend ductility test.Adopt Nemkumar method processing data 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-sag curve 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.
Table 2 test toughness index PCS
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 is known with embodiment 1 contrast, the RPC test specimen that has mixed steel fiber and thick polyolein fiber has improved 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, rising phenomenon appears in thick polyolein fiber, and fiber is skewness on surface of fracture; Embodiment 3 is known with embodiment 1 contrast, the RPC test specimen that has mixed steel fiber and thin polyvinyl alcohol fiber has improved 42.3% than the test specimen toughness of a mixing of steel fiber, the effect improved is not clearly, and after the test specimen incipient crack, bearing capacity has one significantly to jump and descend, although bearing capacity underspeeds slowly subsequently, bearing capacity is lower; Embodiment 4 is known with embodiment 1,2,3 contrasts, the test specimen that simultaneously adds steel fiber, thick polyolein fiber, thin polyvinyl alcohol fiber, its toughness has improved respectively 191.8%, 67.6%, 123.5% than the test specimen of a 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 when test specimen destroys, test specimen is also keeping well globality, and after crack occurs, depression of bearing force is slow, and secondary hardening phenomenon and multiple cracking extension feature are arranged, and this is the unexistent characteristic of general fibrous concrete.By breaking section is observed and is found that cross-section fibers is evenly distributed, steel fiber, thick polyolein fiber and thin polyvinyl alcohol fiber are evenly distributed, the phenomenon of thick polyolein fiber floating do not occur, the characteristic of various fibers is fully used, and realizes good toughening effect.
Finally explanation is, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to preferred embodiment, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not breaking away from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope 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 respectively 16%～19%, 8%～9% of concrete total mass; Length of steel fiber is that 8～13mm, diameter are 0.15～0.25mm; Thick polyolein fiber length is that 35～45mm, diameter are 0.8～1.3mm; Thin polyvinyl alcohol fiber length is that 8～15mm, diameter are 10～15 μ m; Fibers content is by the percentage calculation that accounts for the 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 respectively 16%～22%, 40%～45% of concrete quality.
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 quartz 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. prepare the method for the described any assorted fibre toughening type RPC of claim 1-6, it is characterized in that, comprise the following steps:
Stir: the sand in raw materials used and powder are poured into to stirrer, stir 1～2 minute, even after, water and admixture mixing liquid are slowly poured in stirrer, pour process control at 1 minute; When mixture changes colloidal state into by particulate state, mixing of steel fiber, thick polyolein fiber and thin polyvinyl alcohol fiber are stirred uniformly gradually, stir and within 2～3 minutes, until fiber dispersion, carry out test block after evenly and build, and with the moulding of being vibrated of shaking table vibratory compaction or employing vibrating spear;
Maintenance: then the standing maintenance 48h of standard is 90 ℃ in temperature, maintenance 72h under the environment that humidity is 95%.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103880314A (en) * | 2014-02-23 | 2014-06-25 | 中国科学院福建物质结构研究所 | Forming method for fiber-reinforced concrete |
| CN105585294A (en) * | 2015-11-13 | 2016-05-18 | 北京中企卓创科技发展有限公司 | Hybrid fiber high-crack-resisting and high-tenacity airfield pavement concrete and preparation method thereof |
| CN105622014A (en) * | 2015-12-28 | 2016-06-01 | 郑州大学 | Multi-strength regeneration brick aggregate fiber concrete and preparing method thereof |
| CN106965329A (en) * | 2017-05-18 | 2017-07-21 | 郑州市浩瑞佳机械制造有限公司 | RPC mixing plant |
| 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 |
| CN108501172A (en) * | 2018-04-18 | 2018-09-07 | 上海市建筑科学研究院 | Large dosage, which is chopped, synthesizes the forming method of fine fibre concrete |
| 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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| 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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2013
- 2013-07-26 CN CN201310321057.7A patent/CN103449761B/en not_active Expired - Fee Related
Patent Citations (2)
| 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 |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103880314A (en) * | 2014-02-23 | 2014-06-25 | 中国科学院福建物质结构研究所 | Forming method for fiber-reinforced concrete |
| 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 |
| CN105585294A (en) * | 2015-11-13 | 2016-05-18 | 北京中企卓创科技发展有限公司 | Hybrid fiber high-crack-resisting and high-tenacity airfield pavement concrete and preparation method thereof |
| CN105622014A (en) * | 2015-12-28 | 2016-06-01 | 郑州大学 | Multi-strength regeneration brick aggregate fiber concrete and preparing method thereof |
| CN106965329A (en) * | 2017-05-18 | 2017-07-21 | 郑州市浩瑞佳机械制造有限公司 | RPC mixing plant |
| 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 |
| CN108501172A (en) * | 2018-04-18 | 2018-09-07 | 上海市建筑科学研究院 | Large dosage, which is chopped, synthesizes the forming method of fine fibre 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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