CN1273951A - Modified polypropene staple for concrete and mortar - Google Patents
Modified polypropene staple for concrete and mortar Download PDFInfo
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- CN1273951A CN1273951A CN 00106131 CN00106131A CN1273951A CN 1273951 A CN1273951 A CN 1273951A CN 00106131 CN00106131 CN 00106131 CN 00106131 A CN00106131 A CN 00106131A CN 1273951 A CN1273951 A CN 1273951A
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- concrete
- mortar
- fiber
- modified polypropene
- staple
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0625—Polyalkenes, e.g. polyethylene
- C04B16/0633—Polypropylene
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Artificial Filaments (AREA)
Abstract
A modified polypropene staple used for concrete and mortar features that its cross section has clover-leaf or arc shape with included angle between branches of 120 deg., the staple is porous, its length is 2-20 mm, and its strength is 2.5-4.2 CN/dtex. It can be easily spun. Its advantages include high power to absorb ultraviolet ray, high dispersity and adhesion in concrete and mortar, and high cosmosis and crack resistance.
Description
The invention relates to a kind of modified polypropene staple and goods thereof, more particularly about a kind of concrete and mortar modified polypropene staple and goods thereof.
As everyone knows, the dry shrinkage of cement when solidifying causes basic intravital stress constantly to increase, defective appears in the subregion, it is common so-called crack, cause intensity, resistance to compression, the fold resistance of cement concrete product to descend thus, seepage takes place, and influences its application at special dimension (as hypogee, bridge, dam etc.).
For preventing the cracking of cement concrete product, improve resistance to compression, the fracture resistance of goods, initial people add fiber (as inorganic fibrous magnesium silicate, glass fibre or steel fiber) in cement concrete.Yet the source of fibrous magnesium silicate is limited and carinogenicity is arranged, the corrosion-resistant of glass fibre and steel fiber, and its application is subjected to certain restriction.
English Patent 1,130,612 defectives at above-mentioned fortifying fibre propose to replace traditional fortifying fibre to split the film polypropylene fibre.Because polypropylene has good erosion resistance, can adhere mutually with cement matrix, so demonstrate the due characteristic of fortifying fibre.But polypropylene split-film fibre smooth surface is difficult for disperseing in mixed with cement, locally produces agglomerating phenomenon, thereby has influenced the performance of the reinforced effects of polypropylene split-film fibre.
United States Patent (USP) 4,261,754 pairs of English Patents 1,130,612 are improved, and are promptly earlier that split-film fibre and neat portland cement is mixed at a high speed, make it be able to homodisperse in cement, add sand more afterwards, water mixes, and casting reaches the purpose of improvement thus.Yet, the fibrosis of split-film fibre is by means of the high-speed stirring of it and plain cement and realization, like this mixing and divide the mixed of two steps of stringent condition, brought great difficulty and inconvenience to building operation, and the fibrosis of polypropylene split-film fibre is controlled with dispersing uniformity is also difficult.
Disclose a kind of cement with the anticracking polypropylene fibre in Chinese patent CN-96116519, it is refinforced cement effectively, but the cross section of its fiber is " Y " type, and is not modified polypropene staple.
The purpose of this invention is to provide a kind of defective that can effectively overcome prior art, improve the modified polypropene staple and the goods thereof of concrete and mortar performance.
Two of purpose of the present invention provides a kind of concrete and mortar that is mixed with modified polypropene staple and other additive.
These purposes of the present invention and other purposes will further be set forth and illustrate by following detailed description.
Use in the modified polypropene staple at concrete of the present invention and mortar, the cross section of fiber is trilobal cross or circular arc type and porous crack, 120 ° of branch angles, porosity are 1.8～3.8%, staple length 2～29mm, single fiber fiber number 3.3～48dtex, fibre strength 2.5～4.2CN/dtex, fiber modulus 26～45N/tex, elongate fiber 30～180%, degree of crystallinity 15～36%, orientation degree 26～36 * 10
-3(α N birefringence value).
Further, the concrete of modified polypropene staple of the present invention and mortar in concrete and mortar volume, contain 0.04～1.2kg/m
3Modified polypropene staple.Particularly, in volume of concrete, contain 0.5～1.2kg/m
3Modified polypropene staple, in mortar volume, contain 0.4～0.8kg/m
3Modified polypropene staple.
Concrete of the present invention and mortar are except that containing modified polypropene staple, also can contain in the modified polypropene gross weight, 0.2～0.7% fatty acid amide series additive is preferably 0.2～0.7% ethylenebisstearamide additive and 1～3% ceramic (PP resin alloy, particle diameter are less than 100 microns).Conventional additives in the time of also can adding the use of concrete and mortar if necessary, as water reducer, conditioning agent, thickening material or the like: certainly, also can add other and promote fiber dispersion, prevent from the additive (for example Chang Gui organic silicon surfactant) of fibrous caking in sandstone, grout and can absorb to cut off ultraviolet ray, simultaneously the additive (for example zinc oxide or titanium oxide etc.) of the similar ceramic of fortifying fibre and cement, sandstone clinging power.
Product of the present invention has product and makes the advantage that easy, as can to utilize existing VD series melt-spun production line is produced, and trilobal cross or circular arc type spinning technique on producing is easy, helps the dispersed with stirring in concrete and mortar: best is its can absorb ultraviolet ray and have good dispersed and with the clinging power of sandstone and cement.
In the present invention, polypropylene fibre is a bounding force between polypropylene fibre and concrete and mortar material as the key that strengthens concrete and mortar product, excellent mechanical performances by means of polypropylene fibre transmits the stress that produces in concrete and the mortar solidification process, avoid stress too concentrated, reach and prevent fissured formation, and improve other mechanical property of concrete and mortar.This shows, improve the reinforced effects of polypropylene fibre, should increase contact surface and its mutual clinging power between concrete and mortar and the fiber.
The present invention gives full play to the effect of polypropylene fibre as concrete and mortar fortifying fibre, replace traditional split-film fibre with staple fibre, improve the dispersing uniformity of fiber in concrete and mortar, the flat form that replaces split-film fibre with profile fibre (fibre section is trilobal cross or circular arc type), with the contact area between increased fiber and concrete and mortar, thus raising clinging power between the two; The preparation multi-void fiber to increase the roughness of fiber surface, further improves the clinging power between concrete and mortar and the fiber.
As everyone knows, the mechanical property that the polypropylene fibre that is made by staple process splits the polypropylene fibre that embrane method makes is excellent, in addition, because the prepared polypropene staple of staple process is separated from each other, and between lack cohesive force, disperse mutually very easily under external force, and corresponding split-film fibre need to disperse the external force by means of fierceness, it is torn each other, just can reach aim of even dispersion.
The contact area that increases between staple fibre and concrete and the mortar is to improve an importance of fiber reinforcement effect.The fiber number that reduces staple fibre is the short-cut method that increases fiber surface area, yet only reduces the fiber number of fiber, though can increase the surface-area of fiber widely, the rigidity of fiber weakens, and is difficult to make its straight and upright distribution in concrete and mortar.For reducing fiber curling in concrete and mortar, replace conventional circular fiber with profile fibre.This profile fibre has not only kept bigger surface-area, and the rigidity of fiber is also much larger than circular fiber.Because the increase of rate of cooling in trilobal cross or the circular arc type spinning technique, so the orientation degree of fiber increases, and helps increasing the rigidity of trilobal or circular arc type fiber.For making the easier dispersion of fiber, selected the polypropene staple in trilobal or circular arc type cross section.Because the straightness of trilobal or circular arc type polypropene staple has obtained very big raising, overcome the shortcoming that staple of thin denier easily curls; Meanwhile, trilobal or circular arc type have prevented the arrangement that fiber is drawn close mutually and inlayed mutually than the Y fiber type, improved the fluffiness of fiber widely, have further improved fiber dispersed in concrete and mortar thus and more convenient when using.Trilobal that is made by the present invention or circular arc type polypropene staple are with concrete and mortar when mixed, needn't have smash at a high speed and requirement, and can once mix and finish, thereby mix the inhomogeneity while in people's concrete and the mortar, simplify mixed technological process again at the raising polypropene staple.
The present invention uses mushy polypropylene fibre in order to improve the clinging power between polypropene staple and concrete and mortar, to increase the roughness of fiber surface.The method that improves the fiber porosity is to add polypropylene beta crystallographic system nucleator in spinning process, rely on the β crystalline substance generally only in the presence of nucleator, from fusion-crystallization, obtain, and genus unsteady state, when stretching, change by β crystal orientation α is brilliant, the nucleus volume shrinks in this transformation, so stay hole in the fiber after stretching.This hole makes original slick surface become coarse, thereby improves the clinging power between it and the cement concrete.
Porous crack polypropylene fibre (PP fiber) can prepare by the following method:
It is mixed that 0.1% nucleator, ethylenebisstearamide additive and ceramic (below 10 microns) are added in the PP section (raising sub-petrochemical plant S904) of MI=26, granulation is carried out spinning through staple fibre melt-spinning forcing machine again, and (the spinning jet hole shape has two kinds of circular arc, trilobals, spinning jet hole count 380f or 410f), stretch (70 times of draw ratios), cut off (staple fibre 15mm), record 14.8 dawn of fibre number, intensity 3.4cN/dtex, elongation=58%, orientation degree 28 * 10
-3, density 0.91g/cm
3, modulus=33.6N/dtex.
Embodiment one
Starting material:
The 425a ordinary Portland cement, profit reaches the production of cement company limited in Deqing, Zhejiang.
Gather materials: yellow ground (medium sand), rubble (particle diameter 5～25mm) and standard sand.
Fiber: polypropylene fibre (PP fiber).
Admixture: polypropene staple: trilobal cross and porous crack, branch angle 120, porosity is 3.1%, staple length 15mm, single fiber fiber number 15.1dtex, fibre strength 3.6CN/dtex, fiber modulus 35N/tex, elongate fiber 62%, degree of crystallinity 28%, orientation degree 29 * 10
-3, in 1000 kilograms of PP sections, contain 0.2 kilogram of ethylenebisstearamide additive and 2.5 kilograms of ceramics (PP resin alloy).
Mixing water: tap water.
The anti-dry shrinkage and cracking test of mortar, mortar mix ratio such as table 1
Table 1
The anti-dry shrinkage and cracking The performance test results of mortar is in table 2 table 2
| The mortar kind | Cement | Sand | Water | Fiber | Admixture |
| The benchmark mortar | ????1 | ????1.5 | ????0.5 | ||
| The PP fibre mortar | ????1 | ????1.5 | ????0.5 | ???0.05％ | |
| Admixture PP fibre mortar is arranged | ????1 | ????1.5 | ????0.5 | ???0.05％ | ???5％ |
| Mortar kind fracture length fracture width (mm) | The benchmark mortar | The PP fibre mortar | Admixture PP fibre mortar is arranged |
| ??????d≥3 | ????19.1 | ????0 | ??????0 |
| ??????2≤d＜3 | ????47.2 | ???15.9 | ??????0 |
| ??????1≤d＜2 | ????158.7 | ???138.6 | ??????0 |
| ??????d＜1 | ????166.4 | ???196.7 | ??????0 |
| Weighted value | ????388.7 | ???268.8 | ??????0 |
Cement concrete process for preparation: in stirrer, add cement and PP fiber earlier and carry out dried stirring half a minute, slowly add thereafter and take out after certain water gaging and other material stirred 3 minutes, for test.
(1) circular rings test: above-mentioned material is poured into cylindrical φ 250mm, interior circle φ 190mm, high 50mm has an end annulus, after treating the cement concrete initial set, unclamp external mold and bed die, circular rings is placed 20 ± 3 ℃ of temperature, and relative humidity 60～70% environment are observed round ring opening situation with the fan air blast down after 24 hours.This circular rings does not see have the crack to produce through the diel wind.Show thus: the mixing control, reduce the hardening of cement early crack and produce very big effect of PP fiber, sample dried fully solid after leakless still.
(2) the big flowing concrete test of C30: above-mentioned material is regulated water cement ratio, and the control slump is at 12 ± 2cm casting.GBJ-81 carries out impervious and the splitting resistance strength test to this cement concrete product by normal concrete associating method for testing performance, sees table 3 for details.By table 3 and comparative example as seen, the cement concrete that mixes the PP fiber is impervious, splitting resistance is good than normal concrete, and intensity has improved more than 15%, and splitting resistance improves about 30%.
The influence that the PP fiber mixes concrete performance in the big flowing concrete of table 3C30
Comparative example:
| Index coagulation great soil group | Impervious cm (permeated height) | Splitting resistance ε * 10 -6(distortion before the incipient crack) |
| Add 0.8kg/m 3The MODIFIED PP fibrous concrete | ??????10.6 | ??????384 |
| Do not add normal concrete | ??????13.8 | ??????205 |
Press the proportioning of the cement concrete of embodiment 1, only change the wherein situation of mixing of polypropene staple, and carry out the preparation of cement products.
1, circular rings test:
(1) in cement concrete, do not mix polypropene staple, promptly produced several cracks in 2 hours, be tangible cracking phenomena in 24 hours in the circular rings moulding.
(2) in cement concrete, mix plain polypropylene fiber (fiber Denier 6.6dtex), in the circular rings moulding after three cracks have been seen in the diel air blast.
(3) in cement concrete, mix U.S. fiber NYCON tynex, (dawn is counted 6.6dtex), 2 cracks are also seen in diel air blast after the circular rings moulding.
2, the big flowing concrete test of C30:
With casting after the above-mentioned material adjusting water cement ratio and the control slump, GB-81 carries out resistance to compression and folding strength test to above-mentioned three kinds of cement products by normal concrete associating performance test methods.Cement concrete product resistance to compression, folding strength test result see table 4 for details:
The big flowing concrete of table 4 C30 mixes the influence of different fibers to concrete performance
| Fiber species | Fiber consumption | Water cement ratio | The slump | Ultimate compression strength (MPa) | Ultimate compression strength (MPa) | Folding strength (MPa) |
| ???kg/m 3 | ????％ | ????cm | 7 days | 28 days | 28 days | |
| Common PP fiber | ???0.28 | ??0.638 | ??11.0 | ????24.2 | ???36.0 | ???7.9 |
| The NYCON fiber | ???0.28 | ??0.618 | ??13.4 | ????18.9 | ???29.8 | ???8.2 |
| Do not have | ???0 | ??0.618 | ??14.5 | ????22.2 | ???33.3 | ???4.7 |
By table 4 and table 3 relatively as seen, with the resistance to compression of the common PP fiber cement concrete product that is fortifying fibre and the cement concrete product that folding strength all is lower than the PP fiber.
Comprehensive shape ring and the big flowing concrete test result of C30 show: with the PP fiber be that the fortifying fibre of cement concrete product has that good dispersity, splitting resistance are good, the resistance to compression of cement products, folding strength all have raising by a relatively large margin.
Embodiment 2:
Except that the modified polypropylene fiber that adopts following proportioning, all the other are with example 1.
Polypropene staple: circular arc type and porous crack, branch angle 120, porosity is 2.9%, staple length 12mm, single fiber fiber number 13.8dtex, fibre strength 3.7CN/dtex, fiber modulus 35.8N/tex, elongate fiber 52%, degree of crystallinity 30.5%, orientation degree 3.1 * 10-3; In 1100 kilograms of PP sections, contain 0.7 kilogram of ethylenebisstearamide additive and 1.8 kilograms of ceramics (PP resin alloy).
Example 3:
Except that the modified polypropylene fiber that adopts following proportioning, all the other are with example 1.
Polypropene staple: trilobal cross and porous crack, branch angle 120, porosity is 3.8%, staple length 15.8mm, single fiber fiber number 6.9dtex, fibre strength 2.8CN/dtex, fiber modulus 30N/tex, elongate fiber 45%, degree of crystallinity 18%, orientation degree 27 * 10
-3In 1000 kilograms of PP sections, contain 0.3 kilogram of ethylenebisstearamide additive and 1.4 kilograms of ceramics (PP resin alloy).
Claims (7)
1, a kind of concrete and mortar modified polypropene staple, the cross section that it is characterized in that this fiber is trilobal cross or circular arc type and porous crack, 120 ° of branch angles, porosity are 1.8～3.8%, staple length 2～29mm, single fiber fiber number 3.3～48dtex, fibre strength 2.5～4.2CN/dtex, fiber modulus 26～45N/tex, elongate fiber 30～180%, degree of crystallinity 15～36%, orientation degree 26～36 * 10
-3
2, concrete as claimed in claim 1 and mortar modified polypropene staple is characterized in that in the modified polypropene total amount, also contain 0.2～0.7% fatty acid amide additive.
3, concrete as claimed in claim 2 and mortar modified polypropene staple is characterized in that in the modified polypropene total amount, also contain 0.2～0.7% ethylenebisstearamide additive.
4, concrete as claimed in claim 1 and mortar modified polypropene staple is characterized in that also containing 1～3% ceramic in the modified polypropene total amount.
5, a kind of concrete and mortar that mixes as claim 1,2,3,4 described modified polypropene staples is characterized in that containing 0.04～1.2kg/m in concrete and mortar volume
3Modified polypropene staple.
6, the concrete of modified polypropene staple as claimed in claim 5 and mortar is characterized in that containing 0.5～1.2kg/m in volume of concrete
3Modified polypropene staple.
7, the concrete of modified polypropene staple as claimed in claim 5 and mortar is characterized in that containing 0.4～0.8kg/m in mortar volume
3Modified polypropene staple.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00106131A CN1116241C (en) | 2000-04-26 | 2000-04-26 | Modified polypropene staple for concrete and mortar |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00106131A CN1116241C (en) | 2000-04-26 | 2000-04-26 | Modified polypropene staple for concrete and mortar |
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|---|---|
| CN1273951A true CN1273951A (en) | 2000-11-22 |
| CN1116241C CN1116241C (en) | 2003-07-30 |
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|---|---|---|---|
| CN00106131A Expired - Fee Related CN1116241C (en) | 2000-04-26 | 2000-04-26 | Modified polypropene staple for concrete and mortar |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007000086A1 (en) * | 2005-06-27 | 2007-01-04 | Shenzhen Ocean Power Industrial Co., Ltd | A porous polypropylene modified fibre, the process and the use thereof |
| CN1332079C (en) * | 2004-04-15 | 2007-08-15 | 北京中纺纤建科技有限公司 | Reinforced modified polypropylene coarse fiber for concrete and its preparing method |
| CN105201085A (en) * | 2015-08-26 | 2015-12-30 | 中国林业科学研究院木材工业研究所 | Composite board and preparation method thereof |
| US20220145626A1 (en) * | 2019-04-08 | 2022-05-12 | Tokyo Rope Mgf. Co., Ltd. | Short fiber-reinforced concrete structure using continuous fiber-reinforced polymer material |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1027982C (en) * | 1991-07-13 | 1995-03-22 | 中国科学院化学研究所 | Preparing process of fine denier and ultra-fine denier polypropylene fibre P |
| JP2633763B2 (en) * | 1991-10-01 | 1997-07-23 | 大和紡績株式会社 | Polypropylene fiber for cement reinforcement |
| CN1076032C (en) * | 1995-11-24 | 2001-12-12 | 中国科学院化学研究所 | Fine denier and super-fine denier polypropylene alloy fibre and its prodn. method |
| CN1152054A (en) * | 1996-09-28 | 1997-06-18 | 山东虎山实业集团有限公司 | Polypropylene fibre used for preventing cement from cracking |
| CN1058062C (en) * | 1996-12-27 | 2000-11-01 | 中国科学院化学研究所 | Manufacture of polypropylene staple of thin denier |
| JP3274402B2 (en) * | 1997-12-25 | 2002-04-15 | チッソ株式会社 | Fiber for reinforcing concrete impact strength and concrete molding using the same |
| CN1086367C (en) * | 1998-07-17 | 2002-06-19 | 中国科学院化学研究所 | Fine PP fiber reinforced cement based composite material, and use thereof |
-
2000
- 2000-04-26 CN CN00106131A patent/CN1116241C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1332079C (en) * | 2004-04-15 | 2007-08-15 | 北京中纺纤建科技有限公司 | Reinforced modified polypropylene coarse fiber for concrete and its preparing method |
| WO2007000086A1 (en) * | 2005-06-27 | 2007-01-04 | Shenzhen Ocean Power Industrial Co., Ltd | A porous polypropylene modified fibre, the process and the use thereof |
| CN105201085A (en) * | 2015-08-26 | 2015-12-30 | 中国林业科学研究院木材工业研究所 | Composite board and preparation method thereof |
| US20220145626A1 (en) * | 2019-04-08 | 2022-05-12 | Tokyo Rope Mgf. Co., Ltd. | Short fiber-reinforced concrete structure using continuous fiber-reinforced polymer material |
| US11753823B2 (en) * | 2019-04-08 | 2023-09-12 | Tokyo Rope Mfg. Co., Ltd. | Short fiber-reinforced concrete structure using continuous fiber-reinforced polymer material |
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| Publication number | Publication date |
|---|---|
| CN1116241C (en) | 2003-07-30 |
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