CN1580407A - Fiber-mixed cement-concrete road surface - Google Patents
Fiber-mixed cement-concrete road surface Download PDFInfo
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- CN1580407A CN1580407A CN 03154270 CN03154270A CN1580407A CN 1580407 A CN1580407 A CN 1580407A CN 03154270 CN03154270 CN 03154270 CN 03154270 A CN03154270 A CN 03154270A CN 1580407 A CN1580407 A CN 1580407A
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Abstract
This invention relates to a cement concrete road surface added with mixed fibers characterizing that the mixed fibers are composed of metal fibers and polymer synthetic fibers and the metal fibers are spread on mortars of the road bottom and cement concrete with polymer synthetic fibers is spread on it, the two kinds of fibers used in the cement concrete road surface structure generate exclusive stacked effect, either increasing its mechanic performance by metal fibers and anti-deformation performance of the polymer fibers or stopping it form early plastic crack, seasoning crack and increasing its fatigue resistance.
Description
Technical field the present invention relates to a kind of cement concrete pavement, particularly a kind of cement concrete pavement that adds assorted fibre.
The background technology cement concrete is as the main construction material in the road pavement building engineering, at home and abroad be widely used in the highway construction, based on its made cement concrete pavement, no matter be in intensity, rigidity, stability, durability, all have good operating characteristic.Along with technology, economic development, the use of cement concrete pavement more and more widely even becomes the at first type that high-grade highway is built in some areas.But; Portland cement concrete pavement is because of the restriction of self cement concrete material; in application process, there are problems such as easy shrinkage cracking, tension rupture strength are low, poor toughness, fragility is big, shock resistance is lower, so usually can cause reduce the application life of cement concrete pavement.
For this reason, solve the early stage cracking resistance problem of cement concrete, improve the durability of cement concrete pavement and become the problem that industry is extremely paid close attention to application life.At present the method used always of people has the mode that adopts advanced repairing technique, strengthens the structure on road surface and mix fiber in monolithic concrete to improve above-mentioned performance deficiency.But adopt the repairing technique effect undesirable usually, cost is too high again to adopt the reinforced concrete pavement can play the effect of strengthening road structure, and people add the performances such as cracking resistance, shock resistance that fiber improves cement concrete in cement concrete usually.
Steel fibrous concrete is owing to the tension and the cracking resistance that has strengthened concrete material that mix of steel fibre, as a kind of novel pavement material of function admirable, it can significantly improve concrete tensile strength, bending tensile strength, impact resilience, abrasion resistance and fatigue resistance.In pavement engineering, use obviously attenuate road surface thickness, improve pavement performance.Therefore, Steel Fibre Concrete Pavements was used in recent years always widely.
Disclose one piece in the 11st the 4th phase of volume of December in 2000 " Harbin engineering higher junior college journal " and called scientific paper with " the steel fiber feinforced cement rigid pavement primary research " of Lv Gui cutting edge of a knife or a sword co-present together by Chen Yuan, wherein set forth and in portland cement concrete, mixed disorderly to the short steel fibre that distributes, steel fibre and cement concrete acting in conjunction, can significantly improve concrete every performance indications, not only improved concrete tension, anti-folding, shear strength, and because its performance of resisting cracking makes originally is that the concrete of fragile material presents very high crack resistance in essence, ductility and toughness.Steel fibre adds the change of concrete compressive property little, but because steel fibre stops and delay the generation and the development in crack, concrete tensile strength is significantly improved.Steel fibre is added in the concrete according to suitable ratio, and the steel fibrous concrete rupture strength improves 31.7% than ordinary concrete, and compressive strength improves 22.6%.
What is remarkable though steel fibre is for the enhancing effect of cement concrete bending resistance, tensile strength, in concrete, all add steel fibre, not only improved the cost of engineering greatly, also increased the imposed load of road structure, also existed and mix and stir shortcomings such as difficulty, the use corrosion is overweight, the life-span is short.The 32nd～33 page of page or leaf of " New Building Materials " in May in 2000 discloses the scientific paper of one piece of " analysis of causes on the low side of road surface steel fibrous concrete rupture strength " of being delivered by Zhou Hengliang, Ni Xiuquan, wherein set forth the concrete irrigation method of irregular steel fiber feinforced cement, inappropriate match ratio etc. and all might reduce the excellent results that steel fibre is risen in cement concrete.
Add problems such as the cost that is brought in the cement concrete is too high, stirring difficulty for fear of steel fibre, people are attempting adding other fibers in concrete.Polypropylene fibre has original effectiveness for reducing concrete early-age plastic shrinkage and drying shrinkage, plays the effect that steel fibre is difficult to play in concrete, and it has wear-resistant and freezing and thawing performance, and the opposing thermal stresses prevents characteristics such as the concrete slab aperature of angle and breakage.The 14th～16 page of scientific paper that also discloses one piece of " about polypropylene fibre some understanding " of delivering by people such as Cao Cheng, Liu Lanqiang and Wang Chunyang in " Tianjin build science and technology " supplementary issue in 2002 to the concrete performance influence, illustrated that wherein polypropylene fibre can eliminate or reduce the quantity and the yardstick of pre-existing fracture in the cement concrete, this effect can not only effectively stop concrete generation plastic cracking, and the performance of hardened concrete also is highly profitable; Though polypropylene fibre can not make the quasi-static loading intensity of hardened concrete be significantly improved, but the functional performance of road surface bridge deck concrete is improved by improving concrete impact resistance and anti-fatigue performance, though polypropylene fibre has certain effect to cracking resistance, the tensile strength of improving the road surface, but comparatively speaking, it is but obvious inadequately for the bending tensile strength effect that improves road structure.
Summary of the invention is in order to overcome the deficiencies in the prior art, the invention discloses a kind of assorted fibre cement concrete pavement, it is made up of coagulating cement earth mixtures that hardens and assorted fibre, wherein assorted fibre is made up of metallic fiber and polymer synthetic fiber, fiber is added in the coagulating cement earth mixtures with the ratio that is fit to, and the sclerosis back flattens with stone roller road machine and gets final product.Composite fibre has been given full play to the intrinsic advantage of two kinds of fibers, played simultaneously and strengthened and toughness reinforcing double effect: both brought into play the effectiveness that metallic fiber can significantly improve mechanical performance of concrete and anti-deformation, bring into play the effect that polymer fiber can stop concrete to produce early-age plastic crack, shrinkage crack and increase concrete anti-fatigue performance effectively again, improved cracking of reinforced concrete and durability.Finally not only can increase substantially concrete flexural strength, flexural toughness and deformation performance, significantly improve concrete bending resistance fatigue behaviour, and can also solve problems such as concrete early-age plastic crack, shrinkage crack and shrinkage crack.
Assorted fibre cement concrete pavement of the present invention wherein contains metallic fiber and polymer synthetic fiber, and metallic fiber can be at least a in steel fibre, layered fabric type net-shaped steel fiber, alloy fiber, the netted alloy fiber of layered fabric type; Polymer synthetic fiber can be at least a in polypropylene fibre, polyacrylonitrile fibre, polyester fiber, lignin fibre, mineral fibers, asbestos fiber, cellulose fibre, aramid fiber, the carbon fiber or their boundling shape reticular fibre.
Assorted fibre cement concrete pavement of the present invention, it is the cement concrete pavement that has added polymer fiber and metallic fiber, it in the preparation, at first at the long metallic fiber of even spreading one deck on the mortar of road bottom, its thickness remains between 0.1～0.9cm, and then in the above with the cement-concrete paving that added polymer synthetic fiber, its thickness remains between 15～16cm, the traffic volume and roadbed factor according to the road surface, the paving layer thickness of whole cement concrete can be between 15～17cm, after treating that all thickness is determined, its pressing is got final product with grinding the road machine.
Assorted fibre cement concrete pavement of the present invention, wherein, the interpolation percentage by weight of polymer synthetic fiber in cement concrete is 0.1%～1%.
Assorted fibre cement concrete pavement of the present invention can be applicable to surface layer, floor, diaphragm wall, shear wall, the thin-slab structure of large space structure and the antiscour position of hydraulic engineering etc. of cement road, airfield pavement, industrial premises floor, apron, deck paving, loose rock dam.
Metallic fiber can significantly improve concrete bending tensile strength, and polymer fiber improves concrete opposing plastic cracking ability to reducing concrete early-age plastic shrinkage and drying shrinkage, has a significant effect.Two kinds of fiber composite are applied to can produce very unique stack effectiveness in the cement concrete pavement structure, given full play to the advantage of two kinds of fibers, both brought into play the effectiveness that metallic fiber can significantly improve mechanical performance of concrete and anti-deformation, having brought into play polymer fiber again can stop concrete to produce the early-age plastic crack effectively, the effect of shrinkage crack and increase concrete anti-fatigue performance, play and not only strengthen but also toughness reinforcing double effect, complex fiber cement concrete road surface structure and new material, the mechanical property and the durability of rigid pavement have significantly been improved, saved construction costs significantly, can produce the significant social economic benefit, it is very wide to popularize Application Prospect in an all-round way.
The specific embodiment
Example 1: a kind of complex fiber cement rigid pavement, steel fibre and polyacrylonitrile fibre are united use, on the mortar of its road bottom spreading the steel fibre about one deck 0.3cm, a bed thickness 16cm paves above the steel fibre, the interpolation percentage by weight is 0.2% concrete of poly-acrylonitrile fiber, the concrete that its bending tensile strength does not more add fiber improves 49%, and anti-fatigue life improves 29.1 times.Can obviously improve concrete bending tensile strength, anti-fatigue life.
Example 2: a kind of complex fiber cement rigid pavement, layered steel fiber and polyacrylonitrile fibre are united use, on the mortar of its road bottom spreading one bed thickness be layered steel fiber about 0.4cm, one deck 15cm that paves above the steel fibre is thick, the interpolation percentage by weight is 0.2% concrete of poly-acrylonitrile fiber, and the concrete that the composite fibre concrete fatigue life-span is not more added fiber improves 29.4 times.In the time of 28 days, composite fibre makes the plain concrete flexural strength improve 49.7%, and the flexural toughness index improves 19.6 times, and composite fibre coagulation equivalence flexural strength is up to 2.5MPa.Composite fibre makes the concrete flexural toughness improve 77 times in the time of 90 days, and equivalent flexural strength is up to 2.89MPa.
Example 3: a kind of complex fiber cement rigid pavement, steel fibre and polypropylene fibre are united use, on the mortar of its road bottom spreading the steel fibre about one deck 0.3cm, a bed thickness 16cm paves above the steel fibre, the interpolation percentage by weight is 0.2% polypropylene fiber concrete, the concrete that its bending tensile strength does not more add fiber improves 40%, and anti-fatigue life improves 26.6 times.Can obviously improve concrete bending tensile strength, anti-fatigue life.
Example 4: a kind of complex fiber cement rigid pavement, layered steel fiber and polypropylene fibre are united use, on the mortar of its road bottom spreading one bed thickness be layered steel fiber about 0.4cm, one deck 15cm that paves above the steel fibre is thick, the interpolation percentage by weight is 0.2% polypropylene fiber concrete, and the concrete that the composite fibre concrete fatigue life-span is not more added fiber improves 26.2 times.In the time of 28 days, composite fibre makes the plain concrete flexural strength improve 47.2%, and the flexural toughness index improves 16.3 times, and composite fibre coagulation equivalence flexural strength is up to 2.1MPa.Composite fibre makes the concrete flexural toughness improve 71 times in the time of 90 days, and equivalent flexural strength is up to 2.67MPa.
Example 5: a kind of complex fiber cement rigid pavement, layered steel fiber and aramid fiber are united use, on the mortar of its road bottom spreading one bed thickness be layered steel fiber about 0.4cm, one deck 10cm that paves above the steel fibre is thick, the interpolation percentage by weight is 0.15% aramid fiber concrete, and the concrete that the composite fibre concrete fatigue life-span is not more added fiber improves 32.6 times.In the time of 28 days, composite fibre makes the plain concrete flexural strength improve 62.3%, and the flexural toughness index improves 16.3 times, and composite fibre coagulation equivalence flexural strength is up to 4.76MPa.Composite fibre makes the concrete flexural toughness improve 96 times in the time of 90 days, and equivalent flexural strength is up to 6.23MPa.
Example 6: a kind of complex fiber cement rigid pavement, layered steel fiber and carbon fiber are united use, on the mortar of its road bottom spreading one bed thickness be layered steel fiber about 0.4cm, one deck 15cm that paves above the steel fibre is thick, the interpolation percentage by weight is 0.15% carbon fiber reinforced concrete, and the concrete that the composite fibre concrete fatigue life-span is not more added fiber improves 26.2 times.In the time of 28 days, composite fibre makes the plain concrete flexural strength improve 58.6%, and the flexural toughness index improves 14.2 times, and composite fibre coagulation equivalence flexural strength is up to 4.64MPa.Composite fibre makes the concrete flexural toughness improve 86 times in the time of 90 days, and equivalent flexural strength is up to 5.72MPa.
Example 7: a kind of complex fiber cement rigid pavement, steel fibre and polyester fiber are united use, on the mortar of its road bottom spreading the steel fibre about one deck 0.3cm, a bed thickness 16cm paves above the steel fibre, the interpolation percentage by weight is 0.2% polyester fiber concrete, the concrete that its bending tensile strength does not more add fiber improves 46%, and anti-fatigue life improves 28.1 times.Can obviously improve concrete bending tensile strength, anti-fatigue life.
Claims (8)
1, a kind of fiber cement concrete road surface, mixed fortifying fibre in the coagulating cement earth mixtures, group is characterized in that, described fortifying fibre is made up of metallic fiber and polymer synthetic fiber, and metallic fiber spreads above the mortar that is layered on subcrust, and the one deck that paved on it has added the cement concrete of polymer fiber.
2, fiber cement concrete according to claim 1 road surface is characterized in that, metallic fiber can be at least a in steel fibre, layered steel fiber, alloy fiber, the layered fabric type alloy fiber.
3, assorted fibre cement concrete pavement according to claim 1 and 2, it is characterized in that polymer synthetic fiber can be at least a kind of or their a boundling shape reticular fibre in polypropylene fibre, polyacrylonitrile fibre, polyester fiber, lignin fibre, mineral fibers, asbestos fiber, cellulose fibre, aramid fiber, the carbon fiber.
4, fiber cement concrete according to claim 3 road surface is characterized in that the percentage by weight of the interpolation of polymer synthetic fiber in cement concrete is 0.1%～1%.
5, fiber cement concrete according to claim 1 and 2 road surface is characterized in that the thickness of metallic fibrous layer can remain on 0.1～0.9cm.
6, fiber cement concrete according to claim 3 road surface is characterized in that, the interpolation that metallic fibrous layer paves above the coagulating cement soil thickness of polymer synthetic fiber can remain on 10～16cm.
7, fiber cement concrete according to claim 4 road surface is characterized in that the thickness of metallic fibrous layer can remain on 0.1～0.9cm.
8, fiber cement concrete according to claim 7 road surface is characterized in that, the interpolation that metallic fibrous layer paves above the coagulating cement soil thickness of polymer synthetic fiber can remain on 10～16cm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03154270 CN1580407A (en) | 2003-08-15 | 2003-08-15 | Fiber-mixed cement-concrete road surface |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03154270 CN1580407A (en) | 2003-08-15 | 2003-08-15 | Fiber-mixed cement-concrete road surface |
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| CN1580407A true CN1580407A (en) | 2005-02-16 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102535297A (en) * | 2012-01-13 | 2012-07-04 | 鞍钢集团矿业公司 | Polypropylene fiber concrete roadway structure suitable for large-tonnage cars and construction method |
| CN102561139A (en) * | 2012-01-13 | 2012-07-11 | 鞍钢集团矿业公司 | High-strength steel fiber concrete pavement structure for high-tonnage automobile and construction method |
| CN103121812A (en) * | 2013-01-17 | 2013-05-29 | 齐齐哈尔大学 | Method for manufacturing fiber cement composite crack-resistance floor |
| CN103449761A (en) * | 2013-07-26 | 2013-12-18 | 北京工业大学 | Hybrid fiber-toughened RPC (reactive powder concrete) and preparation technology |
| CN103496894A (en) * | 2013-09-16 | 2014-01-08 | 北京工业大学 | Steel fiber and high-performance synthetic fiber mixed toughened RPC (reactive powder concrete) and preparation method |
| CN105481323A (en) * | 2016-02-02 | 2016-04-13 | 金陵科技学院 | Carbon fiber composite concrete and preparation method thereof |
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