CN1472157A - High-toughness fibre mixed concrete and preparing method thereof - Google Patents

High-toughness fibre mixed concrete and preparing method thereof Download PDF

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Publication number
CN1472157A
CN1472157A CNA031293581A CN03129358A CN1472157A CN 1472157 A CN1472157 A CN 1472157A CN A031293581 A CNA031293581 A CN A031293581A CN 03129358 A CN03129358 A CN 03129358A CN 1472157 A CN1472157 A CN 1472157A
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CN
China
Prior art keywords
concrete
fiber
methylcellulose gum
radix
silicon ash
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Pending
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CNA031293581A
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Chinese (zh)
Inventor
武 姚
姚武
吴科如
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Tongji University
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Tongji University
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Publication date
Application filed by Tongji University filed Critical Tongji University
Priority to CNA031293581A priority Critical patent/CN1472157A/en
Publication of CN1472157A publication Critical patent/CN1472157A/en
Pending legal-status Critical Current

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Abstract

A high-toughness fibre mixture concrete for superhigh building, lang-span overhead structure, and non-cracking thin wall features that it contains two kinds of fibres with high modulus of elasticity and the geometric sizes of said fibres are optimized, so less use of said fibres can greatly improve the strength and toughness of concrete. Its advantages are excellent mechanical performance, and long service life.

Description

High tenacity hybrid fiber concrete and preparation method thereof
Technical field
The invention belongs to civil engineering material technical field, be specifically related to a kind of novel high tenacity hybrid fiber concrete and preparation method thereof.
Background technology
Concrete is the building structural materials of application quantity maximum, but its fatal weakness be that tensile strength is low, fragility is big, easy to crack, this has not only had a strong impact on the work-ing life of concrete structure, and is the potential risk of some disaster accidents.In order to improve concrete fragility, to improve its anti-cracking performance, mixing fiber is valid approach.Fiber reinforced concrete grows up from nineteen seventies as a kind of advanced composite material, and it is an impressive progress on the concrete technology.What but investigator and engineering technical personnel often paid attention to for a long time is the toughening effect and the performance of single fiber.In fact, when single fibers content is low, often produce little effect; And when fibers content was big, not only cost increased considerably, but also can bring the difficulty on the preparation technology, was difficult for being accepted by actual engineering, and these unfavorable factors have seriously restricted the application of fibrous concrete.
Summary of the invention
The present invention is intended to propose a kind of high tenacity hybrid fiber concrete material and preparation method thereof.
The high tenacity hybrid fiber concrete that the present invention proposes is based on common concrete, wherein mix fine carbon fiber is arranged, ordinary steel fiber and dispersion agent accordingly, it is as follows specifically to fill a prescription:
The composition of assorted fibre:
Carbon fiber 0.1-0.5%
Steel fiber 0.1-0.9%
Silicon ash 1-10.0%
Methylcellulose gum 0.01-0.2%
More than two kinds of fiber incorporations be to be the volume percent of radix with the concrete, both are not more than 1.0% at sum, the consumption of dispersion agent silicon ash is for being the weight percent of radix by binder total amount in the concrete, and dispersion agent methylcellulose gum consumption is for being the weight percent of radix by water consumption in the concrete.
The prescription that above-mentioned hybrid fiber concrete is comparatively suitable is as follows:
Carbon fiber 0.1-0.2%
Steel fiber 0.3-0.9%
Silicon ash 3.0-6.0%
Methylcellulose gum 0.05-0.2%
More than two kinds of fibers contents for being the volume percent of radix with the concrete, both are not more than 1.0% at sum.
The consumption of above silicon ash is for being the weight percent of radix by binder total amount in the concrete, and the methylcellulose gum consumption is for being the weight percent of radix by water consumption in the concrete.
To each constituent materials quality following requirement can be arranged:
Carbon fiber: asphaltic base or PAN base carbon fibre, length 3-10 millimeter, diameter are less than 10 microns, and Young's modulus is greater than 200GPa, and unit elongation is greater than 1.4%, and tensile strength is greater than 2000MPa.
Steel fiber: length is not less than 2 times of concrete maximum diameter of aggrogate, and length-to-diameter ratio is greater than 60, and Young's modulus is greater than 200GPa, and unit elongation is greater than 3.0%, and tensile strength is greater than 1500MPa.
Silicon ash: grain diameter 0.01~0.1 μ m, SiO 2Content greater than 90%.
Methylcellulose gum: technical grade and above grade.
Concrete can be each class hierarchy concrete of C25-C85, concrete material requirements:
Cement: label is 32.5 or 42.5 silicate or ordinary Portland cement.
Yellow ground: medium river sand.
Stone: rubble.
Water reducer: ordinary water-reducing agent or high efficiency water reducing agent.
The preparation process of above-mentioned hybrid fiber concrete material is as follows:
Take by weighing each component material (as cement, sand, stone, admixture, water, silicon ash, methylcellulose gum and fiber) respectively by the requirement of concrete material proportioning, methylcellulose gum is scattered in earlier in the water of 25-35%, being stirred to methylcellulose gum dissolves fully, subsequently carbon fiber is added in the solution, stir; Cement, sand, stone, silicon ash and steel fiber are poured in the stirrer, and dry mixing is even, adds the mixing solutions and the remaining water of carbon fiber and methylcellulose gum then, stirs, and control at last adds water reducer, is stirred to the required slump and gets final product.
The present invention has the following advantages:
1. by selecting suitable dispersion agent for use, assorted fibre is uniformly dispersed, thereby brings into play enhancing, the action of crack arrest of fiber better.
2. the present invention is according to the matching effect of material characteristics yardstick, utilize carbon fiber to improve the performance of cement paste and mortar level, utilize steel fiber to improve the performance of mortar and concrete level, adopt the form of fiber hybrid, under the situation of smaller volume volume, improve mechanical properties of concrete on the whole.
3. the present invention has made full use of steel fiber and concrete physical bond and carbon fiber and concrete chemical bonding.Strengthen fiber and concrete interfacial transition zone, strengthened the friction resistance of fiber and matrix, significantly improved the ability of interface resistance to deformation.
4. the present invention combines fiber simultaneously and extracts with fiber and draw short two kinds of mechanism, makes assorted fibre can make maximum merit in drawing in destructive process, has obtained best enhancing and toughening effect.
5. the present invention does not influence the stirring technique of conventional concrete owing to used lower fibers content, has realized low fibers content, the concrete high-quality effect of high tenacity.Go for the site operation of any concrete structure.
6. the present invention makes concrete strength improve 30-50%, residual strength coefficient (R under the situation of assorted fibre volume volume≤1% 10,30) greater than 100, energy-to-break improves 20-30 doubly, even still can present superior strain hardening behavior after the concrete material incipient crack.Security, the weather resistance of concrete structure have been significantly improved.
(it is inner existing little of micron-sized CSH gel for the present invention's characteristics heterogeneous, multi-level according to concrete material itself, thick to millimetre-sized sand, big rubble to centimetre-sized is arranged) again, optimum geometric by two kinds of high-elastic modulus fibres mixes, make each level characteristics yardstick of fiber and concrete that matched well be arranged, concrete is strengthened and toughness reinforcing purpose thereby reach on the whole.The present invention can be widely used in the concrete structure in fields such as building, water conservancy, municipal administration, traffic, ocean, nuclear power.
Each set of dispense of embodiment embodiment 1, hybrid fiber concrete is such as following:
Cement (label 42.5) 470kg
Medium sand 684kg
Rubble (maximum particle diameter 15mm) 1024kg
Water 196kg
High efficiency water reducing agent 2.5kg
Silicon ash 20kg
Methylcellulose gum 0.2kg
Carbon fiber (length 5mm) 3kg
Steel fiber (length 30mm) 24kg
By the abovementioned steps preparation, promptly get material requested.
Performance:
Unit weight (kg/m 3) 2420
28 days ultimate compression strength (MPa) 58.2
28 days tensile strength (MPa) 5.95
28 days folding strengths (MPa) 7.36
28 days residual strength coefficient (R 10,30) 105.9
Each set of dispense of 28 days energy-to-break (N/m) 2602.6 embodiment 2, hybrid fiber concrete is such as down:
Cement (label 42.5) 300kg
Medium sand 665kg
Rubble (maximum particle diameter 12mm) 1235kg
Water 180kg
Efficient additive 0.5kg
Silicon ash 10kg
Methylcellulose gum 0.2kg
Carbon fiber (length 3mm) 1.5kg
Steel fiber (length 35mm) 39kg
By the abovementioned steps preparation, promptly get material requested.
Performance:
Unit weight (kg/m 3) 2430
28 days ultimate compression strength (MPa) 44.5
28 days tensile strength (MPa) 4.62
28 days folding strengths (MPa) 5.85
28 days residual strength coefficient (R 10,30) 122.5
Each set of dispense of 28 days energy-to-break (N/m) 2580.2 embodiment 3, hybrid fiber concrete is such as down:
Cement (label 42.5) 500kg
Medium sand 690kg
Rubble (maximum particle diameter 10mm) 1010kg
Water 176kg
Efficient additive 5.0kg
Silicon ash 25kg
Methylcellulose gum 0.2kg
Carbon fiber (length 5mm) 3kg
Steel fiber (length 30mm) 50kg
By the abovementioned steps preparation, promptly get material requested.
Performance:
Unit weight (kg/m 3) 2460
28 days ultimate compression strength (MPa) 85.6
28 days tensile strength (MPa) 8.90
28 days folding strengths (MPa) 11.42
28 days residual strength coefficient (R 10,30) 115.0
28 days energy-to-break (N/m) 2843.5

Claims (7)

1. a high tenacity hybrid fiber concrete material is characterized in that based on common concrete, wherein mix fine carbon fiber is arranged, ordinary steel fiber and corresponding dispersion agent, it is as follows specifically to fill a prescription:
Carbon fiber 0.1--0.5%
Steel fiber 0.1--1.0%
Silicon ash 1--10.0%
Methylcellulose gum 0.01--0.2%
More than two kinds of fiber incorporations for being the volume percent of radix with the concrete, both are no more than 1.0% at sum, the consumption of dispersion agent silicon ash is for being the weight percent of radix by binder total amount in the concrete, and dispersion agent methylcellulose gum consumption is for being the weight percent of radix by water consumption in the concrete.
2. concrete material according to claim 1 is characterized in that the proportioning of each component is as follows:
Carbon fiber 0.1--0.2%
Steel fiber 0.3--0.9%
Silicon ash 3.0--6.0%
Methylcellulose gum 0.05--0.2%
More than two kinds of fiber incorporations for being the volume percent of radix with the concrete, both are no more than 1.0% at sum, the consumption of silicon ash is for being the weight percent of radix by binder total amount in the concrete, and the methylcellulose gum consumption is for being the weight percent of radix by water consumption in the concrete.
3. according to the described concrete material of claim 1, it is characterized in that carbon fiber adopts asphaltic base or PAN base carbon fibre, length 3-10 millimeter, diameter are less than 10 microns, and Young's modulus is greater than 200GPa, and unit elongation is greater than 1.4%, and tensile strength is greater than 2000MPa.
4. according to the described concrete material of claim 1, the length that it is characterized in that steel fiber is not less than 2 times of concrete maximum diameter of aggrogate, and length-to-diameter ratio is greater than 60, and Young's modulus is greater than 200GPa, and unit elongation is greater than 3.0%, and tensile strength is greater than 1500MPa.
5. according to the described concrete material of claim 1, it is characterized in that cement employing label is 32.5 or 42.5 silicate or ordinary Portland cement.
6. according to the described concrete material of claim 1, the grain diameter that it is characterized in that the silicon ash is 0.01~0.1 μ m, SiO 2Content greater than 90%; Methylcellulose gum is technical grade and above grade.
7. preparation method of concrete material according to claim 1 is characterised in that concrete steps are as follows:
Take by weighing each component respectively by the requirement of concrete material proportioning, earlier methylcellulose gum is scattered in the water of 25-35%, be stirred to methylcellulose gum and dissolve fully, subsequently carbon fiber is added in the solution, and stir; Cement, sand, stone, silicon ash and steel fiber are poured in the stirrer, and dry mixing is even, adds the mixing solutions and the remaining water of carbon fiber and methylcellulose gum then, stirs, and control at last adds water reducer, is stirred to the required slump and gets final product.
CNA031293581A 2003-06-19 2003-06-19 High-toughness fibre mixed concrete and preparing method thereof Pending CN1472157A (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
CNA031293581A CN1472157A (en) 2003-06-19 2003-06-19 High-toughness fibre mixed concrete and preparing method thereof

Publications (1)

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CN1472157A true CN1472157A (en) 2004-02-04

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1302051C (en) * 2005-04-08 2007-02-28 南京航空航天大学 Organic-inorganic composite gel material
CN100367022C (en) * 2005-03-09 2008-02-06 湖南科技大学 Intelligent concrete test block and its producing and use
CN102093010A (en) * 2010-11-24 2011-06-15 中国建筑材料科学研究总院 Low-cost carbon fiber reinforced concrete and preparation method and application thereof
US7964539B2 (en) 2004-06-17 2011-06-21 Statoil Asa Well treatment
CN101712183B (en) * 2009-10-20 2011-08-03 武汉理工大学 Method for manufacturing chopped carbon fiber reinforced concrete
CN102276183A (en) * 2011-07-12 2011-12-14 长安大学 Admixture for enhancing toughness of cement concrete
US8210261B2 (en) 2005-04-26 2012-07-03 Statoil Asa Method of well treatment and construction
CN102557555A (en) * 2011-12-28 2012-07-11 河南大学 Mineral fiber-modified flexible rubber concrete
CN103332917A (en) * 2013-06-13 2013-10-02 镇江崟鑫新型建材科技有限公司 Anti-cracking building exterior wall material and preparation method thereof
US8596358B2 (en) 2004-06-17 2013-12-03 Statoil Asa Well treatment
US8863855B2 (en) 2007-06-26 2014-10-21 Statoil Asa Method of enhancing oil recovery
CN106278012A (en) * 2016-07-25 2017-01-04 安庆惠嘉新型建材有限公司 A kind of steel carbon mixed-fiber reinforced concrete material and preparation method thereof
CN107140887A (en) * 2017-05-31 2017-09-08 福建江夏学院 A kind of marine environment corrosion resistant high tenacity concrete and preparation method thereof

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8596358B2 (en) 2004-06-17 2013-12-03 Statoil Asa Well treatment
US7964539B2 (en) 2004-06-17 2011-06-21 Statoil Asa Well treatment
CN100367022C (en) * 2005-03-09 2008-02-06 湖南科技大学 Intelligent concrete test block and its producing and use
CN1302051C (en) * 2005-04-08 2007-02-28 南京航空航天大学 Organic-inorganic composite gel material
US8210261B2 (en) 2005-04-26 2012-07-03 Statoil Asa Method of well treatment and construction
US8863855B2 (en) 2007-06-26 2014-10-21 Statoil Asa Method of enhancing oil recovery
CN101712183B (en) * 2009-10-20 2011-08-03 武汉理工大学 Method for manufacturing chopped carbon fiber reinforced concrete
CN102093010A (en) * 2010-11-24 2011-06-15 中国建筑材料科学研究总院 Low-cost carbon fiber reinforced concrete and preparation method and application thereof
CN102276183A (en) * 2011-07-12 2011-12-14 长安大学 Admixture for enhancing toughness of cement concrete
CN102557555A (en) * 2011-12-28 2012-07-11 河南大学 Mineral fiber-modified flexible rubber concrete
CN103332917A (en) * 2013-06-13 2013-10-02 镇江崟鑫新型建材科技有限公司 Anti-cracking building exterior wall material and preparation method thereof
CN106278012A (en) * 2016-07-25 2017-01-04 安庆惠嘉新型建材有限公司 A kind of steel carbon mixed-fiber reinforced concrete material and preparation method thereof
CN107140887A (en) * 2017-05-31 2017-09-08 福建江夏学院 A kind of marine environment corrosion resistant high tenacity concrete and preparation method thereof

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