CN1834050A - Plastic anti-crack modified fiber of cement-based material and prepn. process - Google Patents

Plastic anti-crack modified fiber of cement-based material and prepn. process Download PDF

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Publication number
CN1834050A
CN1834050A CN 200510024459 CN200510024459A CN1834050A CN 1834050 A CN1834050 A CN 1834050A CN 200510024459 CN200510024459 CN 200510024459 CN 200510024459 A CN200510024459 A CN 200510024459A CN 1834050 A CN1834050 A CN 1834050A
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cement
fibre
fiber
plastic
shape
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CN 200510024459
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CN100434382C (en
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马一平
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Tongji University
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Tongji University
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Abstract

This invention is attributed to the field of materials science and engineering and concretely speaking, relates to a kind of modified fibers for preventing plastic cracking of cement-based materials (such as cement paste, mortar, concrete their composites), which comprises organic synthetic fibers, inorganic fibers or organic-inorganic hybrid fibers and modifiers. The modified fibers in this invention perform significant prevention from plastic shrinkage cracking of cement-based materials from their molding to complete solidification, and over 90% plastic cracking can be reduced by doping with the fibers compared to undoped ones. They also have an effect of reducing 30~50% more plastic cracking than unmodified fibers. This invention can be widely applied in cement-based materials engineering, such as cement-concrete roads, bridge decks, grounds, slope protection, dams, etc, so as promote project quality.

Description

Plastic anti-crack modified fiber of cement-based material and preparation method thereof
Technical field
The invention belongs to the Materials Science and Engineering science and technology field, particularly a kind of modified fibre that prevents cement-based material (cement paste, mortar, concrete and matrix material thereof) plastic shrinkage cracking.
Background technology
Concrete is a consumption maximum in the world, one of most popular manufactured construction materials.At present, China's cement annual production has reached 8.6 hundred million tons, and a year concrete amount has reached 20 billion cubic meters.In the quite a long time from now on, concrete will be the main material of construction that China's modern project is built.And, since its have applied widely, low price, easy casting, more durable, also can effectively utilize some using industrial solid wastes to make advantages such as energy saving and environment friendly material of construction, and the irreplaceable effect of performance other materials in numerous building engineering fields.
But concrete has also that tensile strength is low, and ultimate tensile strength is little, and resistance to impact shock is poor, and especially fragility is big, and before hardening of cement, because plastic shrinkage, dry dehydration cause shortcomings such as concrete cracking.Wherein the defective of the easy plastic shrinkage cracking of cement concrete is great to the concrete engineering quality influence, especially to high-strength concrete, gently then cause and do over again because of directly influencing the engineering visual appearance at Construction stage, heavy then bring the plastic stage shrinkage crack into the engineering operational phase, make concrete influence performances such as its impervious, freeze proof, anti-chemical mediator erosion, anti-steel bar corrosion because of this " congenital " defective, cause concrete to shorten greatly work-ing life, concrete safeguards that rehabilitation expense rises in a large number.In various concrete modifying technology, the Application and Development of fibrous concrete can think that the maximum of concrete technology one of is made progress in recent years.According to studies show that both at home and abroad, when the synthon about admixture 0.05-0.10% (volume fraction) in concrete, as the Nycon fiber of the U.S., polypropylene fibre etc., can reduce its plastic shrinkage cracks about 50% under the condition that does not reduce mechanical performance of concrete, thereby improve concrete construction quality and weather resistance effectively.
Summary of the invention
The objective of the invention is to provides a kind of modified fibre that can be used for the cement-based material plastic anti-crack for solving the plastic cracking of engineering.
The modified fibre that the present invention proposes is made up of organic synthetic fibers, inorganic fibre or organic-inorganic assorted fibre and properties-correcting agent, and the volume percent of its component is as follows:
Organic synthetic fibers 0~95%
Inorganic fibre 0~70%
Properties-correcting agent 2~30%
Total amount satisfies 100%.
The preferable volume percent of each component is as follows:
Organic synthetic fibers 0~90%
Inorganic fibre 0~60%
Properties-correcting agent 5~25%
Total amount satisfies 100%.
Among the present invention, organic synthetic fibers comprises polyethylene fibre, polypropylene fibre, trevira, nylon fiber, polyacrylonitrile fibre etc.; Inorganic fibre comprises steel fiber, glass fibre, fibrous magnesium silicate, carbon fiber, ceramic fiber, mineral fibre etc.; Properties-correcting agent includes organic polymer emulsion, tensio-active agent, interface coupling agent etc.
Among the present invention, the Young's modulus of organic synthetic fibers is 2~10GPa, and tensile strength is 300~800MPa, and the ultimate elongation rate is 8~60%, and fibre section diameter (or equivalent diameter) is 25~120 μ m, and staple length is 10~40mm; The Young's modulus of inorganic fibre is 60~350GPa, and tensile strength is 800~4500MPa, and the ultimate elongation rate is 2~6%, and fibre section diameter (or equivalent diameter) is 3~800 μ m, and staple length is 3~40mm.The organic synthetic fibers cross-sectional shape has shapes such as circle, rectangle, trilobal, and the fiber axial shape has linear, waviness etc., and the fibrous termination shape has concordant shape, dumb-bell shape etc.; The inorganic fibre cross-sectional shape has shapes such as circle, rectangle, trilateral, and the fiber axial shape has linear, waviness, impression shape etc., and the fibrous termination shape has concordant shape, dumb-bell shape, end hook shape etc.
Among the present invention, the organic polymer emulsion comprises ACRYLIC EMULSION, benzene emulsion, polyvinyl alcohol emulsion etc.; Tensio-active agent comprises anion surfactant, nonionogenic tenside, polymeric surface active agent etc.; Interface coupling agent comprises silane coupling agent, titanate coupling agent.
Preparation method of the present invention is as follows: the organic and inorganic or organic-inorganic assorted fibre of choosing different diameter, length, cross-sectional shape, axial shape, termination shape, properties-correcting agent is dissolved in alcohols, ethers, the water equal solvent, by above-mentioned volume percent metering filamentary material and material modified, placing mixing container to add properties-correcting agent fiber stirs, promptly obtains product of the present invention through suitable oven dry.
The present invention is a solid fiber shape material, is packaged into bag behind the ganging of products, should guard against damp during storage, prevent fires.
The using method of modified fibre of the present invention:
1. the volume of modified fibre of the present invention is 0.04 ~ 0.4% of a cement-based material cumulative volume.
2. can in the sill that mixes cement, modified fibre be added stirring with other cement-based material; Also can after finish, the cement-based material stirring add modified fibre again and continue to stir.
3. cast thereafter, vibrate, wipe one's face, the person is not the same with mixing the fiber for operation such as maintenance.
The present invention can be widely used in the cement-based material engineering, as engineerings such as cement concrete pavement, bridge floor, terrace, bank protection, dam, airfield runways, with performances such as the anti-plastic shrinkage crackings of raising cement-based material.
The present invention has the following advantages:
1. behind this product of admixture, the plastic shrinkage cracking performance of cement-based material can reduce significantly, when adopting the test of mortar flat band method, the total weighted value of its plastic shrinkage cracking can almost not reduce 100% than mixing the person, with respect to unmodified processing fibre-effects effect, the subtracting of modified fibre split effect and is about 30~50%.
2. behind this product of admixture, the workability of cement-based material, ultimate compression strength, folding strength etc. are unaffected, even can increase, and resistance to impact shock can improve 50~500%.
3. behind this product of admixture, the impermeability of cement-based material, frost resistance etc. can obtain improvement to a certain degree.
Embodiment
The invention is further illustrated by the following examples.
Embodiment 1
The modified fibre volume percent is:
Polypropylene fibre 95%
Properties-correcting agent 5%
Polypropylene fibre is selected trilobal for use, and the fiber equivalent diameter is 34 μ m, and staple length is 20mm; Properties-correcting agent is selected nonionogenic tenside for use.Polypropylene fibre is mixed sand-cement slurry (32.5 Portland cements: medium sand: water=1: 1: 0.5) with 0.10% volume fraction, adopt flat band method to record its decrement and be about 100% plastic shrinkage cracking, with respect to the unmodified fibers action effect, the properties-correcting agent of modified fibre subtracts and splits effect and be about 30%.
Embodiment 2
The modified fibre volume percent is:
Polyacrylonitrile fibre 60%
Glass fibre 30%
Properties-correcting agent 10%
Polyacrylonitrile fibre is selected rectangle for use, and the fiber equivalent diameter is 100 μ m, and staple length is 20mm; Glass fibre is selected zirconia content 6% for use, and Fibre diameter is 13 μ m, and staple length is 10mm; Properties-correcting agent is selected anion surfactant for use.Modified fibre is mixed sand-cement slurry (32.5 Portland cements: medium sand: water=1: 1: 0.5) with 0.04% volume fraction, adopt flat band method to record its decrement and be about 95% plastic shrinkage cracking, with respect to the unmodified fibers action effect, the properties-correcting agent of modified fibre subtracts and splits effect and be about 50%.
Embodiment 3
The modified fibre volume percent is:
Nylon fiber 49%
Mineral fibre 49%
Properties-correcting agent 2%
Nylon fiber is selected circle or dumb-bell shape for use, and Fibre diameter is 43 μ m, and staple length is 20mm; Mineral fibre is circular, and Fibre diameter is 8 μ m, and staple length is 15mm; Properties-correcting agent is selected silane coupling agent for use.Modified fibre is mixed cement concrete (32.5 Portland cements: 5-25mm rubble: medium sand: water=1: 0.75: 0.75: 0.5) with 0.20% volume fraction, adopt flat band method to record its decrement and be about 93% plastic shrinkage cracking, with respect to the unmodified fibers action effect, the properties-correcting agent of modified fibre subtracts and splits effect and be about 40%.
Embodiment 4
The modified fibre volume percent is:
Steel fiber 70%
Properties-correcting agent 30%
Steel fiber is selected trilateral, end hook shape for use, and Fibre diameter is that 750 μ m, staple length are 35mm; Properties-correcting agent is selected ACRYLIC EMULSION for use.Modified fibre is mixed cement concrete (32.5 Portland cements: 5-25mm rubble: medium sand: water=1: 0.75: 0.75: 0.5) with 0.40% volume fraction, adopt flat band method to record its decrement and be about 98% plastic shrinkage cracking, with respect to the unmodified fibers action effect, the properties-correcting agent of modified fibre subtracts and splits effect and be about 50%.

Claims (9)

1, a kind of plastic anti-crack modified fiber of cement-based material is characterized in that:
Be made up of organic synthetic fibers, inorganic fibre or organic-inorganic assorted fibre and properties-correcting agent, the volume percent of its component is as follows:
Organic synthetic fibers 0~95%
Inorganic fibre 0~70%
Properties-correcting agent 2~30%
Total amount satisfies 100%.
2, plastic anti-crack modified fiber of cement-based material according to claim 1 is characterized in that:
The preferable volume percent of each component is as follows:
Organic synthetic fibers 0~90%
Inorganic fibre 0~60%
Properties-correcting agent 5~25%
Total amount satisfies 100%.
3, plastic anti-crack modified fiber of cement-based material according to claim 1 is characterized in that:
Organic fibre is a kind of of polypropylene fibre, polyacrylonitrile fibre, trevira, nylon fiber, inorganic fibre is a kind of of steel fiber, glass fibre, ceramic fiber, mineral fibre, and properties-correcting agent is a kind of of polymer emulsion, tensio-active agent, coupling agent.
4, plastic anti-crack modified fiber of cement-based material according to claim 1 is characterized in that:
The Young's modulus of organic synthetic fibers is 2 ~ 10GPa, and tensile strength is 300 ~ 800MPa, and the ultimate elongation rate is 8 ~ 60%, and the fibre section diameter is 25 ~ 120 μ m, and staple length is 10 ~ 40mm.
5, plastic anti-crack modified fiber of cement-based material according to claim 1 is characterized in that:
The Young's modulus of inorganic fibre is 60 ~ 350GPa, and tensile strength is 800 ~ 4500MPa, and the ultimate elongation rate is 2 ~ 6%, and the fibre section diameter is 3 ~ 800 μ m, and staple length is 3 ~ 40mm.
6, plastic anti-crack modified fiber of cement-based material according to claim 1 is characterized in that:
The cross-sectional shape of organic synthetic fibers is a kind of of circle, rectangle, trilobal, and the fiber axial shape is a kind of of linear, waviness, and fibrous termination is shaped as a kind of of concordant shape, dumb-bell shape.
7, plastic anti-crack modified fiber of cement-based material according to claim 1 is characterized in that:
The cross-sectional shape of inorganic fibre is a kind of of circle, rectangle, trilateral, and the fiber axial shape is a kind of of linear, waviness, impression shape, and fibrous termination is shaped as a kind of of concordant shape, dumb-bell shape, end hook shape.
8, a kind of preparation method of plastic anti-crack modified fiber of cement-based material as claimed in claim 1 is characterized in that:
Choose the fiber of different diameter, length, cross-sectional shape, axial shape, termination shape, measure various filamentary materials and properties-correcting agent material by above-mentioned organic and inorganic fiber, properties-correcting agent volume percent, placing mixing container to add properties-correcting agent fiber stirs, mix, through suitably being drying to obtain this product.
9, a kind of plastic anti-crack modified fiber of cement-based material as claimed in claim 1 is characterized in that:
The modified fibre addition content is 0.04~0.4% of the cement-based material cumulative volume when using.
CNB2005100244596A 2005-03-18 2005-03-18 Plastic anti-crack modified fiber of cement-based material and prepn. process Expired - Fee Related CN100434382C (en)

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103485256A (en) * 2013-09-11 2014-01-01 长安大学 Grading glass fiber crushed stone seal coat preparation method
CN105324348A (en) * 2013-06-21 2016-02-10 建筑研究和技术有限公司 Cementitious composite material including a plurality of filled fibers
CN105541209A (en) * 2015-12-21 2016-05-04 中民筑友有限公司 Basalt fiber reinforced cement based material and preparation method therefor
CN105541208A (en) * 2015-12-21 2016-05-04 中民筑友有限公司 Basalt fiber reinforced cement based material and preparation method therefor
CN105585265A (en) * 2014-10-24 2016-05-18 深圳市维特耐新材料有限公司 Organic thick/thin composite fiber used for cement-based composite material and preparation method thereof
CN105776976A (en) * 2016-03-31 2016-07-20 武汉理工大学 Modified fiber toughened cement-based material and preparation method thereof
CN106517959A (en) * 2016-11-22 2017-03-22 江苏苏博特新材料股份有限公司 Epoxy mortar adopting surface modified fibers for toughness enhancement
US10131579B2 (en) 2015-12-30 2018-11-20 Exxonmobil Research And Engineering Company Polarity-enhanced ductile polymer fibers for concrete micro-reinforcement
CN109400026A (en) * 2018-11-15 2019-03-01 重庆工业职业技术学院 New type chemical material for building
CN110372251A (en) * 2019-08-30 2019-10-25 陕西龙宾立德新材料科技有限公司 A kind of antimitotic agent and its preparation method and application
CN110407495A (en) * 2019-08-30 2019-11-05 陕西龙宾立德新材料科技有限公司 A kind of cracking resistance cement foaming insulation board material and preparation method thereof
CN110423054A (en) * 2019-08-07 2019-11-08 维特国际新材料(武汉)有限公司 The anti-folding durable cement based composites of the fiber containing PP
US10717673B2 (en) 2015-12-30 2020-07-21 Exxonmobil Research And Engineering Company Polymer fibers for concrete reinforcement
CN111825379A (en) * 2020-07-06 2020-10-27 深圳市深建混凝土有限公司 Preparation process of environment-friendly recycled concrete

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JP2001226161A (en) * 2000-02-21 2001-08-21 Taiheiyo Cement Corp Reusable precast member for concrete structure
CN100348527C (en) * 2003-09-19 2007-11-14 同济大学 Miscellaneous fiber reinforced cement-base composite moterial without plastic cracking

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105324348A (en) * 2013-06-21 2016-02-10 建筑研究和技术有限公司 Cementitious composite material including a plurality of filled fibers
CN103485256A (en) * 2013-09-11 2014-01-01 长安大学 Grading glass fiber crushed stone seal coat preparation method
CN105585265A (en) * 2014-10-24 2016-05-18 深圳市维特耐新材料有限公司 Organic thick/thin composite fiber used for cement-based composite material and preparation method thereof
CN105541208A (en) * 2015-12-21 2016-05-04 中民筑友有限公司 Basalt fiber reinforced cement based material and preparation method therefor
CN105541209A (en) * 2015-12-21 2016-05-04 中民筑友有限公司 Basalt fiber reinforced cement based material and preparation method therefor
US10717673B2 (en) 2015-12-30 2020-07-21 Exxonmobil Research And Engineering Company Polymer fibers for concrete reinforcement
US10131579B2 (en) 2015-12-30 2018-11-20 Exxonmobil Research And Engineering Company Polarity-enhanced ductile polymer fibers for concrete micro-reinforcement
CN105776976A (en) * 2016-03-31 2016-07-20 武汉理工大学 Modified fiber toughened cement-based material and preparation method thereof
CN106517959A (en) * 2016-11-22 2017-03-22 江苏苏博特新材料股份有限公司 Epoxy mortar adopting surface modified fibers for toughness enhancement
CN109400026A (en) * 2018-11-15 2019-03-01 重庆工业职业技术学院 New type chemical material for building
CN110423054A (en) * 2019-08-07 2019-11-08 维特国际新材料(武汉)有限公司 The anti-folding durable cement based composites of the fiber containing PP
CN110423054B (en) * 2019-08-07 2021-06-25 维特国际新材料(武汉)有限公司 Fracture-resistant durable cement-based composite material containing PP fibers
CN110407495A (en) * 2019-08-30 2019-11-05 陕西龙宾立德新材料科技有限公司 A kind of cracking resistance cement foaming insulation board material and preparation method thereof
CN110372251A (en) * 2019-08-30 2019-10-25 陕西龙宾立德新材料科技有限公司 A kind of antimitotic agent and its preparation method and application
CN110407495B (en) * 2019-08-30 2021-12-14 陕西龙宾立德新材料科技有限公司 Anti-crack cement foam insulation board material and preparation method thereof
CN111825379A (en) * 2020-07-06 2020-10-27 深圳市深建混凝土有限公司 Preparation process of environment-friendly recycled concrete
CN111825379B (en) * 2020-07-06 2022-02-22 深圳市深建混凝土有限公司 Preparation process of environment-friendly recycled concrete

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