CN1152054A - Polypropylene fibre used for preventing cement from cracking - Google Patents
Polypropylene fibre used for preventing cement from cracking Download PDFInfo
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- CN1152054A CN1152054A CN 96116519 CN96116519A CN1152054A CN 1152054 A CN1152054 A CN 1152054A CN 96116519 CN96116519 CN 96116519 CN 96116519 A CN96116519 A CN 96116519A CN 1152054 A CN1152054 A CN 1152054A
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Abstract
The present invention relates to the prepn of compression-resisting anti-cracking cement concrete product in building material. The cement concrete product is produced by adding porous irregular polypropylene short-staple and through full tamping and deposition. Owing to the dispersivity of short staple, large contact area between the fibre and concrete, the rigidity of Y-section fibre and the roughness of porous fibre, the reinforcing fibre results in raised mechanical property of cement concrete product. The said product is esp suitable for use in underground building, dam and bridge.
Description
The invention relates to the preparation of cracking resistance, resistance to compression, anti-folding cement concrete product.It is to mix abnormity polypropylene fibre (hereinafter to be referred as the PPy fiber) in a small amount of porous crack in cement concrete, makes the preparation of cracking resistance, resistance to compression, anti-folding cement concrete product through mixed, cast or pumping moulding.
As everyone knows, the drying of cement when solidifying shunk and caused the stress in the matrix 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 influence is in the application of 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 asbestos fibre, glass fibre or steel fibre) in cement concrete.Yet, the corrosion-resistant of source finite sum carcinogenic, glass fibre and the steel fibre of asbestos fibre, its application is subjected to certain restriction.BP 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 corrosion resistance, can adhere mutually with cement matrix, so demonstrate the due characteristic of fortifying fibre.But polypropylene fibrilled film fibre surface is smooth, is difficult for disperseing in mixing with cement, and the part produces agglomerating phenomenon, thereby has influenced the performance of the enhancing effect of polypropylene fibrilled film fibre.United States Patent (USP) 4,261,754 pairs of BPs 1,130,612 improve, promptly earlier that fibrilled film fibre and neat portland cement is mixed at a high speed, make it be able to even dispersion in cement, add husky, water afterwards again and mix, moulding by casting has reached the purpose of improvement thus.Yet, the fibration of fibrilled film fibre be by means of the high-speed stirring of it and striaght cement and and realize, the mixed of two steps mixed and divides in strictness like this, and construction is brought difficulty and inconvenience, and the fibration of polypropylene fibrilled film fibre and the also difficult control of dispersing uniformity.
The analysis polypropylene fibre is bonding forces between polypropylene fibre and cement material as the key of refinforced cement goods, excellent mechanical performances by means of polypropylene fibre transmits the stress that produces in the cement solidification process, avoid stress too concentrated, reach the formation that prevents the crack, and improve other mechanical property of cement concrete.This shows, improve the enhancing effect of polypropylene fibre, should increase contact-making surface and its mutual adhesion strength between cement and the fiber.
The present invention gives full play to the effect of polypropylene fibre as the cement concrete fortifying fibre, sets about from following three aspects:
1. replace traditional fibrilled film fibre with staple fibre, purpose be improve fiber in cement concrete dispersing uniformity and improve homodisperse process conditions; 2. replace the flat form of fibrilled film fibre with profiled filament, purpose is the contact area between increased fiber and cement, thereby improves adhesion strength between the two; 3. preparation multi-void fiber, purpose are the roughness that increases fiber surface, further improve the adhesion strength between cement concrete 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 fibrilled film fibre need to disperse the external force by means of fierceness, and it is torn each other, just can reach aim of even dispersion, under both contrasts, obviously with staple fibre for well.
The contact area that increases between staple fibre and the cement concrete is to improve an importance of fiber reinforcement effect.The fiber number that reduces staple fibre is the simple and quick 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 cement.For reducing fiber curling in cement, replace conventional circular fiber with abnormity (V, Y shape) fiber.These two kinds of fibers have not only kept bigger surface area, and the rigidity of fiber is also much larger than circular fiber.For making the easier dispersion of fiber, the elite polypropene staple of selecting y-shaped cross-section (y-shaped cross-section sees Fig. 1 for details. the spinneret orifice sectional view).Because the straightness of Y shape polypropene staple has obtained very big raising, overcome the shortcoming that staple of thin denier easily curls; Meanwhile, Y shape has long on one side feature, has prevented the arrangement that fiber is drawn close mutually and inlayed mutually, has improved the bulkiness of fiber widely, further improves fiber dispersed and enforcement simple and direct in cement concrete thus.The Y shape polypropene staple that is made by the present invention is with cement concrete when mixed, needn't have smash at a high speed and requirement, and can once mix and finish, thereby mix the inhomogeneity while in the cement concrete, simplify mixed technical process again at the raising polypropene staple.
The present invention for the measure that improves the adhesion strength between polypropene staple and cement concrete is: prepare mushy polypropylene fibre, increase the roughness of fiber surface.The principle that improves the fiber porosity is: 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 labile 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 smooth surface become coarse, thereby improves the adhesion strength between it and the cement concrete.
The preparation method of porous crack polypropylene fibre (PP fiber):
It is mixed that 0.1% quinoline pyridine ketone E3B nucleator is added in the PP section (raising sub-petrochemical plant S-904) of MI=23, granulation is carried out spinning through staple fibre melt spinning extruder again, and (the spinnerets hole shape has two kinds of circle, Y shapes, spinnerets hole count 400f or 800f), (draw ratio 7.5-8 doubly) stretches, cut off (staple fibre 6-40mm), record fibre number 6.6dtex, intensity 5cN/dtex, elongation=22%, orientation factor f
x=0.81, density 0.89g/cm
3, acoustic mode amount=125N/dtex, moisture absorption ratio 0.12%.Embodiment one
In cement gel mortar mixer, carry out the preparation of cement concrete with following component:
The cement Portland cement, Shanghai Cement Plant resembles board 525
Medium sand modulus of fineness 2.7
Stone 5-25mm continuous grading rubble
Flyash I level flyash, Shanghai pit hole mouth power plant
Additive meets the JC473-92 standard
The water drinking water
(porosity is 3% for PP fiber Y shape, multi-void fiber; Fibre length 6-40mm
Single fiber fiber number 6.6dtex; Fibre strength＞5CN/dtex;
Fiber modulus＞125N/tex; Elongate fiber＞20%;
Degree of crystallinity＞50%; The degree of orientation＞0.81)
Cement concrete process for preparation: in mixer, add cement and PP earlier
yFiber carries out dried stirring half a minute, slowly adds thereafter to take out after certain water gaging and other material stirred 3 minutes, for test.
(1) zero shape ring test: above-mentioned material is poured into cylindrical Ф 250mm, interior circle Ф 190mm, high 50mm has an end annulus, after treating the cement concrete initial set, unclamp external mold and bed die, zero shape ring is placed 20 ± 3 ℃ of temperature, and relative humidity 60-70% environment is observed O type ring cracking situation with the fan air blast down after 24 hours.This zero shape ring does not see have the crack to produce through the diel wind.(Fig. 2, label 1 are zero shape ring opening situation).Show thus: PP
yThe mixing control, reduce the hardening of cement early crack and produce very big effect of fiber, sample dried fully solid after free from flaw still.
(2) the big flowing concrete test of C30: above-mentioned material is regulated the ratio of mud, and the control slump is at 12 ± 2cm moulding by casting.GB-81 carries out the test of resistance to compression and rupture strength to this cement concrete product by normal concrete associating method for testing performance, sees table 1 for details.By table 1 and comparative example as seen, mix PP
yIt is good that the plain polypropylene fiber is mixed in the cement concrete resistance to compression of fiber, and intensity has improved more than 23%, and rupture strength improves about 10%.The sample that does not more add fiber is compared then and is improved respectively about 33% and 83%.
PP in the big flowing concrete of table 1 C30
yFiber mixes the influence of concrete performance
| Fiber consumption ratio of mud slump kg/m 3??????????????(cm) | Compression strength (MPa) 7 days 28 days | Rupture strength (MPa) 28 days |
| 0.0028????0.628????12.3 | ??28.0???44.3 | ????8.6 |
Comparative example:
Press the proportioning of the cement concrete of embodiment one, only change the wherein situation of mixing of polypropene staple, and carry out the preparation of cement products.
1, zero shape ring test:
(1) in cement concrete, do not mix polypropene staple, promptly produced several cracks in 2 hours, be tangible cracking phenomena in 24 hours at zero shape ring forming.(Fig. 2 label is blank test)
(2) in cement concrete, mix plain polypropylene fiber (fiber Denier 6.6dtex), at zero shape ring forming after three cracks have been seen in the diel air blast.(Fig. 2 label is 2)
(3) mix the U.S. in cement concrete and produce fiber NYCON polyamide fiber, the dawn is counted 6.6dtex), 2 cracks are also seen in diel air blast behind zero shape ring forming.(Fig. 2 label 3)
2, the big flowing concrete test of C30: with moulding by casting after the above-mentioned material adjusting ratio of mud and the control slump, GB-81 carries out resistance to compression and rupture strength test to above-mentioned three kinds of cement products by normal concrete associating performance test methods.Cement concrete product resistance to compression, rupture strength test result see table 2 for details.The big flowing concrete of table 2 C30 mixes different fibers influences fiber species fiber consumption ratio of mud slump compression strength (MPa) rupture strength (MPa) to concrete performance
(kg/m
3) (%) (cm) 7 days 28 days 28 days common PP fiber 0.28 0.638 11.0 24.2 36 7.9 beautiful 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
Relatively as seen table 2 and table 1 all be lower than PP with the resistance to compression and the rupture strength of the common PP fiber cement concrete product that is fortifying fibre
yThe cement concrete product of fiber.
Comprehensive zero shape ring and the big flowing concrete test result of C30 show: with PP
yFiber is that the fortifying fibre of cement concrete product has that good dispersion, crack resistance are good, the resistance to compression of cement products, rupture strength all have raising by a relatively large margin.
Claims (5)
- One kind to comprise polypropylene fibre be that fortifying fibre prepares cracking resistance, resistance to compression, anti-folding cement concrete product.It is characterized in that with porous crack, special-shaped staple fibre be the fortifying fibre of cement concrete product.
- 2. by right item 1 described porous fibre, its porosity is 3%.
- 3. be Y shape fiber by right item 1 described profiled filament.
- 4. by right item 1,3 described Y shape fibers, its branch angle is 120.Wherein one is other two 1.5 times.
- 5. by right item 1 described polypropene staple:(single fiber fiber number 6.6dtex; Fibre strength 5cN/dtexDegree of crystallinity＞50%; The degree of orientation＞0.81; Fibre length 6-40mm)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96116519 CN1152054A (en) | 1996-09-28 | 1996-09-28 | Polypropylene fibre used for preventing cement from cracking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96116519 CN1152054A (en) | 1996-09-28 | 1996-09-28 | Polypropylene fibre used for preventing cement from cracking |
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| Publication Number | Publication Date |
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| CN1152054A true CN1152054A (en) | 1997-06-18 |
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|---|---|---|---|
| CN 96116519 Pending CN1152054A (en) | 1996-09-28 | 1996-09-28 | Polypropylene fibre used for preventing cement from cracking |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN1116241C (en) * | 2000-04-26 | 2003-07-30 | 中国纺织大学化纤科技开发部 | Modified polypropene staple for concrete and mortar |
| CN102154724A (en) * | 2011-05-18 | 2011-08-17 | 大连工业大学 | Flash polypropylene fiber and preparation method thereof |
| CN107709640A (en) * | 2015-07-24 | 2018-02-16 | 三菱化学株式会社 | The manufacture method of polypropylene fibre and the polypropylene fibre |
| CN108947379A (en) * | 2018-08-21 | 2018-12-07 | 张玉英 | A kind of durability concrete and preparation method |
| WO2019071704A1 (en) * | 2017-10-13 | 2019-04-18 | 广东水电二局股份有限公司 | Low-plasticity composite base concrete and roller-compacted concrete dam impervious layer produced therefrom |
| CN113322839A (en) * | 2021-07-09 | 2021-08-31 | 中电建路桥集团有限公司 | Anti-cracking structure of super-huge PK box composite beam bridge deck |
| CN113735516A (en) * | 2021-09-10 | 2021-12-03 | 中国建材检验认证集团股份有限公司 | Synthetic fiber concrete and preparation method thereof |
-
1996
- 1996-09-28 CN CN 96116519 patent/CN1152054A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN1116241C (en) * | 2000-04-26 | 2003-07-30 | 中国纺织大学化纤科技开发部 | Modified polypropene staple for concrete and mortar |
| CN102154724A (en) * | 2011-05-18 | 2011-08-17 | 大连工业大学 | Flash polypropylene fiber and preparation method thereof |
| CN102154724B (en) * | 2011-05-18 | 2014-02-26 | 大连工业大学 | Flash polypropylene fiber and preparation method thereof |
| CN107709640A (en) * | 2015-07-24 | 2018-02-16 | 三菱化学株式会社 | The manufacture method of polypropylene fibre and the polypropylene fibre |
| WO2019071704A1 (en) * | 2017-10-13 | 2019-04-18 | 广东水电二局股份有限公司 | Low-plasticity composite base concrete and roller-compacted concrete dam impervious layer produced therefrom |
| CN108947379A (en) * | 2018-08-21 | 2018-12-07 | 张玉英 | A kind of durability concrete and preparation method |
| CN113322839A (en) * | 2021-07-09 | 2021-08-31 | 中电建路桥集团有限公司 | Anti-cracking structure of super-huge PK box composite beam bridge deck |
| CN113735516A (en) * | 2021-09-10 | 2021-12-03 | 中国建材检验认证集团股份有限公司 | Synthetic fiber concrete and preparation method thereof |
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