CN104098285B - Waste paper fiber for self-curing of cement-based material, and preparation method of waste paper fiber - Google Patents
Waste paper fiber for self-curing of cement-based material, and preparation method of waste paper fiber Download PDFInfo
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- CN104098285B CN104098285B CN201410339314.4A CN201410339314A CN104098285B CN 104098285 B CN104098285 B CN 104098285B CN 201410339314 A CN201410339314 A CN 201410339314A CN 104098285 B CN104098285 B CN 104098285B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention relates to a waste paper fiber for self-curing of a cement-based material, and a preparation method of the waste paper fiber. The waste paper fiber is prepared from the following raw materials in parts by weight: 60-90 parts of waste paper secondary fiber, 5-30 parts of dispersant, 0.1-1 part of alkyl surfactant and 3-15 parts of alkali-resistant coating. Compared with the prior art, the prepared waste paper fiber for the self-curing can compensate the defect of moisture generated by negative pressure of a capillary pore in an early shrinkage process of the cement-based material, raises the hydration degree of cement, and reduces shrinkage cracking of the cement-based material at a hardening stage.
Description
Technical field
The invention belongs to building material field, especially relate to a kind of waste paper fibre for cement-based material Self-curing and
Its preparation method.
Background technology
The always large construction material of cement-based material, is widely used in building trade, but because it is non-equal
The high-strength concrete of the low water binder ratio of matter phase, especially research in recent years, because the micro-crack that contraction causes directly affects cement-based material
Mechanical property and endurance quality.Affected by environment and hydrated cementitious process, when external environment condition humidity be less than interior humidity or
Internal void water cannot normally meet hydrated cementitious water consumption, and in the case that outside moisture can not feed in time, cement matrix
Material will produce dry shrinkage and self-constriction, and this directly affects the stability of cement-based material volume, and the shape along with micropore
Become, lead to cement-based material micropore specific area and pore volume to increase, shrinkage cracking rate rises, and embodies in the form of micro-crack
Out, the incorporation of fiber largely solves this problem.
Steel fibre has higher modulus, has certain effectiveness in the extension of cement-based material macroscopic cracking, but right
The control effect of early stage resistance contracting is simultaneously inconspicuous.Polypropylene fibre can improve and suppress produced by cement-based material premature cure
Crack, but the characteristic of its hardly water suction makes it cannot be carried out real-Time Compensation to cement matrix capillary in the hole moisture.Cellulose fiber
Dimension has the loose structure being mutually communicated so as to have natural hydrophilicity.Except the bridging similar with polypropylene fibre is made
With outer, its unique hydrophilicity makes pressure in capilar bore during cement-based material early curing maintain higher level.
It is dried in evaporation and cement hydration process and consumes a part of Free water, when in capilar bore, hydraulic pressure is less than contained by cellulose fibre
During the pressure that water produces, cellulose fibre is discharged moisture to compensate capilar bore negative pressure in time, so that cement-based material
Realize effect of internal Self-curing, accelerate hydrated cementitious process.The consistency of material is increased, micropore specific area and hole body
Long-pending decline, resistance is split rate and is risen, and then alleviates the generation of cement-based material early-age shrinkage crackle.But the cellulose fiber of current research
Dimension derives from virgin fibers mostly, needs to remove hemicellulose and lignin through paper technology during preparing cellulose fibre,
Increased production cost, waste wooden resource, cellulose extractive process needs substantial amounts of soda acid to participate in, the discharge of waste water simultaneously
Also result in serious water and soil pollution.
The main component of waste paper is cellulose, and the waste paper after process contains more than 70% cellulose fibre, possesses above-mentioned carrying
To cellulose fibre can make the advantage of realizing Self-curing in cement-based material.In principle, it can substitute log processing
Cellulose fibre is simultaneously applied to cement-based material.Importantly, the waste paper fibre handling process for this field is simple, no
Need extracting hemicelluloses and lignin, also do not need deinking bleaching and treating process, production cost substantially reduces, and the row of waste water
High-volume also greatly reduce with content of organics, the waste water of discharge does not result in environmental pollution, achieve waste paper fibre simultaneously again
Recycling, but how really to realize twice laid is currently still technical problem urgently to be resolved hurrily.
Content of the invention
It is an object of the invention to proposing one kind to be used for cement-based material autotrophy close around resources sustainable development
Shield waste paper fibre it is intended that compensate cement-based material early-age shrinkage during pore negative pressure produce moisture disappearance, improve water
Mud degree of hydration, reduces the shrinkage cracking of cement-based material hardening phase.
It is a further object to provide the preparation method of the above-mentioned waste paper fibre for cement-based material Self-curing.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of waste paper fibre for cement-based material Self-curing is it is characterised in that contained using following components and weight portion
The raw material of amount prepares:
As preferred embodiment, using following raw material: waste paper secondary stock 70～90；Dispersant 8～20；Alkyl table
Face activating agent 0.3～0.6；Alkali resistant coating 5～10.
Leftover pieces that described waste paper secondary stock is abandoned by paper mill, post consumer printing paper, wrapping paper, urban life waste paper
Obtain through discongesting, waste paper secondary stock length range is 1.5～2.1mm, nominal diameter is 20～32 μm, and content of cellulose is more than
70%, water absorption rate is more than 8 times of self gravitation.
Described dispersant is more than Kaolin or the bentonite of 5000 mesh for fineness.
Described surfactant is cetyl ammonium bromide or cetyl chloride ammonium.
Described alkali resistant coating is nanometer tio2The hydrosol.
For the preparation method of the waste paper fibre of cement-based material Self-curing, using following steps:
(1) waste paper is soaked and is completely soaked in water a period of time, pour in hydrabrusher, control pulping concentration be 5～
15wt%, pulping temperature is 20～70 DEG C, and pulper rotating speed 200～850r/min, pulping 20～60min dredge to waste paper
Solution；
(2) paper pulp after discongesting part is immersed in after 2 hours in the naoh solution of 1～5wt% and carries out ultrasound wave and locate in advance
Reason or direct ultrasonic Treatment, controls ultrasonic power is 100～600w, and process time is 5～30min, ultrasonic paper pulp dense
Spend for 1～5wt%；
(3) paper pulp fiber after ultrasonic pretreatment is dried in electric drying oven with forced convection；
(4) prepare raw material according to formula；
(5) slurry load weighted waste paper secondary stock being made into 3～5wt% is dense, is subsequently poured into except other of alkali resistant coating
Component, in electric blender, stirring 30～45min, to mix homogeneously, removes moisture removal, dries to constant weight；
(6) above-mentioned paper pulp fiber is immersed in alkali resistant coating, through 30min under sonic oscillation about take out paper pulp fiber, and
Slowly it is dried 12 hours at 60 DEG C, that is, prepare product.
As preferred embodiment, pulping concentration is controlled to be 8～12wt% in step (1), pulping temperature is 40～60
DEG C, pulper rotating speed 300～500r/min, pulping 30～45min, discongest to waste paper.
As preferred embodiment, the naoh solution concentration adopting in step (2) is 1～3wt%, and ultrasonic power is
250～400w, process time is 10～20min, and the concentration of ultrasonic paper pulp is 1～3wt%.
Waste paper fibre for cement-based material Self-curing in use, routinely volume mix cement mortar concrete or
In cement based mending mortar.In general, the waste paper fibre volume for cement-based material Self-curing of the present invention is water
The 0.1～5% of Binder Materials quality in cement mortar, concrete.
Compared with prior art, the invention has the advantages that
1) waste paper fibre has and preferably absorbs water, releases water feature, can supplement capilar bore negative pressure in time, make cement-based material
Realize the ability of Self-curing.
2) after adopting alkali activation processing and ultrasonic pretreatment, agglomerate fibre bundles are dispersed, and the formation of microfibril increases
The specific surface area of waste paper fibre and pore volume, and aperture connects it is allowed to more free water penetration and outflow, substantially increases
The water absorbing capacity of waste paper fibre, makes cement-based material Self-curing effect more preferable.
3) fiber prepared for raw material with waste paper avoids the complexity of hemicellulose and lignin in extracting wood cell wall
Technique, more without deinking and bleaching process, reduces cellulose fibre production cost, decreases environmental pollution.
4) compared with current inventive technique, the sustainable development that the present invention more meets the national renewable sources of energy requires, raw material
Wide material sources, simple production process is reasonable, and the cellulose fibre that alternative building materials are processed with log has good market prospect
And application value.
Specific embodiment
With reference to specific embodiment, the present invention is described in detail.
Embodiment 1
A kind of waste paper fibre for cement-based material Self-curing, using the raw material preparation of following components and weight portion content
Obtain: waste paper secondary stock 60, dispersant 5, alkyl surfactants 0.1, alkali resistant coating 3, wherein, waste paper secondary stock is by making
The leftover pieces of paper plant's discarding, post consumer printing paper, wrapping paper, urban life waste paper obtain through discongesting, waste paper secondary stock length model
Enclose for 1.5～2.1mm, nominal diameter is 20～32 μm, content of cellulose is more than 70%, water absorption rate is more than 8 times of self gravitation.
Dispersant is more than Kaolin or the bentonite of 5000 mesh for fineness.Surfactant is cetyl ammonium bromide or Cetyl Chloride
Change ammonium.Alkali resistant coating is nanometer tio2The hydrosol.
For the preparation method of the waste paper fibre of cement-based material Self-curing, using following steps:
(1) waste paper is soaked and is completely soaked in water a period of time, pour in hydrabrusher, control pulping concentration be 5～
15wt%, pulping temperature is 20～70 DEG C, and pulper rotating speed 200～850r/min, pulping 20～60min dredge to waste paper
Solution；
(2) paper pulp after discongesting part is immersed in after 2 hours in the naoh solution of 1～5wt% and carries out ultrasound wave and locate in advance
Reason or direct ultrasonic Treatment, controls ultrasonic power is 100～600w, and process time is 5～30min, ultrasonic paper pulp dense
Spend for 1～5wt%；
(3) paper pulp fiber after ultrasonic pretreatment is dried in electric drying oven with forced convection；
(4) prepare raw material according to formula；
(5) slurry load weighted waste paper secondary stock being made into 3～5wt% is dense, is subsequently poured into except other of alkali resistant coating
Component, in electric blender, stirring 30～45min, to mix homogeneously, removes moisture removal, dries to constant weight；
(6) above-mentioned paper pulp fiber is immersed in alkali resistant coating, through 30min under sonic oscillation about take out paper pulp fiber, and
Slowly it is dried 12 hours at 60 DEG C, that is, prepare product.
The specific process parameter of the present embodiment is as shown in the table:
Table 1 Waste Paper Handling technological parameter
Table 2 waste paper fibre performance indications
Calculate by the ratio of mud 0.25, weigh suitable water consumption, will be complete for the waste paper fibre after above-mentioned ultrasonic pretreatment
It is soaked in 20min in water, water suction saturation fully dispersed rear and cement mixing, be simultaneously introduced 1.9 ‰ water reducer, net in cement
Stirring at low speed 2min in slurry blender, then high-speed stirred 1min, in the indoor maintenance of self-constriction experiment to 7d after molding.Waste paper is fine
0.2% for cement weight is measured by Wesy；Cement is the little open country in south of the River water in field mud p.ii52.5；Water reducer is sd-600p-01 polycarboxylic acids
High efficiency water reducing agent.
Cement slurry specific surface area declines 19%, and pore volume declines 28%, and decrement is 33%.
Embodiment 2
A kind of waste paper fibre for cement-based material Self-curing, using the raw material preparation of following components and weight portion content
Obtain: waste paper secondary stock 70；Dispersant 8；Alkyl surfactants 0.3；Alkali resistant coating 5, waste paper secondary stock is by paper mill
The leftover pieces of discarding, post consumer printing paper, wrapping paper, urban life waste paper obtain through discongesting, and waste paper secondary stock length range is
1.5～2.1mm, nominal diameter is 20～32 μm, and content of cellulose is more than 70%, and water absorption rate is more than 8 times of self gravitation.Dispersion
Agent is more than Kaolin or the bentonite of 5000 mesh for fineness.Surfactant is cetyl ammonium bromide or cetyl chloride
Ammonium.Alkali resistant coating is nanometer tio2The hydrosol.
For the preparation method of the waste paper fibre of cement-based material Self-curing, same as Example 1, specific process parameter is such as
Shown in lower:
Table 3 Waste Paper Handling technological parameter
Table 4 waste paper fibre performance indications
By ultrasonic pretreated waste paper fibre and dry-mixed cement 20s, by water, 1.3 ‰ water reducer and cement mixing, water
Mud: water=1: 0.3, stirring at low speed 2min in agitator for cement mortar, then high-speed stirred 1min, real in self-constriction after molding
Test indoor maintenance to 28d.Waste paper fibre consumption is the 0.3% of cement weight；Cement is the little open country in south of the River water in field mud p.ii52.5；Subtract
Water preparation is sd-600p-01 high-efficiency water-reducing agent of poly-carboxylic acid.
Cement slurry specific surface area declines 35%, and pore volume declines 23%, and decrement is 24.3%.
Embodiment 3
A kind of waste paper fibre for cement-based material Self-curing, using the raw material preparation of following components and weight portion content
Obtain: waste paper secondary stock 90；Dispersant 20；Alkyl surfactants 0.6；Alkali resistant coating 10.Waste paper secondary stock is by papermaking
The leftover pieces of factory's discarding, post consumer printing paper, wrapping paper, urban life waste paper obtain through discongesting, waste paper secondary stock length range
For 1.5～2.1mm, nominal diameter is 20～32 μm, and content of cellulose is more than 70%, and water absorption rate is more than 8 times of self gravitation.Point
Powder is more than Kaolin or the bentonite of 5000 mesh for fineness.Surfactant is cetyl ammonium bromide or cetyl chloride
Ammonium.Alkali resistant coating is nanometer tio2The hydrosol.
For the preparation method of the waste paper fibre of cement-based material Self-curing, same as Example 1, specific process parameter is such as
Shown in lower:
Table 5 Waste Paper Handling technological parameter
Table 6 waste paper fibre performance indications
Weigh suitable water consumption, waste paper fibre after above-mentioned ultrasonic pretreatment is completely soaked 20min in water, water suction is full
With and fully dispersed after mix with cement, sand, 2.5 ‰ water reducers, cement: water: sand=1: 0.4: 1, low in mortar mixer
Speed mixing 2min, then mixed at high speed 1min, test indoor maintenance 28d in self-constriction after molding.Waste paper fibre consumption is cement
The 1% of weight；Cement is southern cement p.o42.5；Water reducer is sd-600p-01 high-efficiency water-reducing agent of poly-carboxylic acid.
Mortar samples specific surface area declines 26%, and pore volume declines 20%, and decrement is 37.5%.
Embodiment 4
A kind of waste paper fibre for cement-based material Self-curing, using the raw material preparation of following components and weight portion content
Obtain: waste paper secondary stock 90；Dispersant 30；Alkyl surfactants 1；Alkali resistant coating 15.Waste paper secondary stock is by paper mill
The leftover pieces of discarding, post consumer printing paper, wrapping paper, urban life waste paper obtain through discongesting, and waste paper secondary stock length range is
1.5～2.1mm, nominal diameter is 20～32 μm, and content of cellulose is more than 70%, and water absorption rate is more than 8 times of self gravitation.Dispersion
Agent is more than Kaolin or the bentonite of 5000 mesh for fineness.Surfactant is cetyl ammonium bromide or cetyl chloride
Ammonium.Alkali resistant coating is nanometer tio2The hydrosol.
For the preparation method of the waste paper fibre of cement-based material Self-curing, same as Example 1, specific process parameter is such as
Shown in lower:
Table 7 Waste Paper Handling technological parameter
Table 8 waste paper fibre performance indications
Above-mentioned pretreated waste paper fibre is absorbed water saturation in advance, then mixes with cement, water and sand, be simultaneously introduced 10 ‰
Water reducer, cement: water: sand=1: 0.35: 1, mixed on low speed 2min in mortar mixer, then mixed at high speed 1min, molding
Afterwards in the indoor maintenance of self-constriction experiment to 3d.Waste paper fibre consumption is the 2% of cement weight, and cement is southern cement p.o42.5,
Water reducer is sd-600p-01 high-efficiency water-reducing agent of poly-carboxylic acid.
Mortar samples specific surface area declines 41%, and pore volume declines 28%, and decrement is 55%.
Embodiment 5
A kind of waste paper fibre for cement-based material Self-curing, using the raw material preparation of following components and weight portion content
Obtain: waste paper secondary stock 90；Dispersant 30；Alkyl surfactants 1；Alkali resistant coating 15.Waste paper secondary stock is by paper mill
The leftover pieces of discarding, post consumer printing paper, wrapping paper, urban life waste paper obtain through discongesting, and waste paper secondary stock length range is
1.5～2.1mm, nominal diameter is 20～32 μm, and content of cellulose is more than 70%, and water absorption rate is more than 8 times of self gravitation.Dispersion
Agent is more than Kaolin or the bentonite of 5000 mesh for fineness.Surfactant is cetyl ammonium bromide or cetyl chloride
Ammonium.Alkali resistant coating is nanometer tio2The hydrosol.
For the preparation method of the waste paper fibre of cement-based material Self-curing, same as Example 1, specific process parameter is such as
Shown in lower:
Table 9 Waste Paper Handling technological parameter
Table 10 waste paper fibre performance indications
Weigh suitable water consumption, above-mentioned ultrasonic pretreated waste paper fibre is completely soaked 20min in water, water suction
Saturation and fully dispersed after mix with cement, sand, 8 ‰ water reducers, cement: water: sand=1: 0.45: 2, low in mortar mixer
Speed mixing 2min, then mixed at high speed 1min, in the indoor maintenance of self-constriction experiment to 7d after molding.Waste paper fibre consumption is cement
The 2% of weight, cement is southern cement p.o42.5, and water reducer is sd-600p-01 high-efficiency water-reducing agent of poly-carboxylic acid.
Mortar samples specific surface area declines 35%, and pore volume declines 21%, and decrement is 45%.
Embodiment 6
A kind of waste paper fibre for cement-based material Self-curing, using the raw material preparation of following components and weight portion content
Obtain: waste paper secondary stock 90；Dispersant 30；Alkyl surfactants 1；Alkali resistant coating 15.Waste paper secondary stock is by paper mill
The leftover pieces of discarding, post consumer printing paper, wrapping paper, urban life waste paper obtain through discongesting, and waste paper secondary stock length range is
1.5～2.1mm, nominal diameter is 20～32 μm, and content of cellulose is more than 70%, and water absorption rate is more than 8 times of self gravitation.Dispersion
Agent is more than Kaolin or the bentonite of 5000 mesh for fineness.Surfactant is cetyl ammonium bromide or cetyl chloride
Ammonium.Alkali resistant coating is nanometer tio2The hydrosol.
Table 11 Waste Paper Handling technological parameter
Table 12 waste paper fibre performance indications
By above-mentioned ultrasonic pretreated waste paper fibre saturation in advance, then mix with cement, water and sand, be simultaneously introduced 3 ‰
Water reducer, cement: water: sand=1: 0.3: 1, mixed on low speed 2min in mortar mixer, then mixed at high speed 1min, after molding
In the indoor maintenance of self-constriction experiment to 3d.Waste paper fibre consumption is the 1% of cement weight, and cement is southern cement p.o42.5, subtracts
Water preparation is sd-600p-01 high-efficiency water-reducing agent of poly-carboxylic acid.
Mortar samples specific surface area declines 36%, and pore volume declines 28%, and decrement is 50%.
Claims (6)
1. a kind of waste paper fibre for cement-based material Self-curing is it is characterised in that adopt following components and weight portion content
Raw material prepare:
Leftover pieces that described waste paper secondary stock is abandoned by paper mill, post consumer printing paper, wrapping paper, urban life waste paper are through dredging
Solution obtains, and waste paper secondary stock length range is 1.5～2.1mm, and nominal diameter is 20～32 μm, and content of cellulose is more than
70%, water absorption rate is more than 8 times of self gravitation；
Described alkali resistant coating is nanometer tio2The hydrosol, described dispersant is more than Kaolin or the swelling of 5000 mesh for fineness
Soil.
2. a kind of waste paper fibre for cement-based material Self-curing according to claim 1 is it is characterised in that preferably adopt
Use following raw material: waste paper secondary stock 70～90；Dispersant 8～20；Alkyl surfactants 0.3～0.6；Alkali resistant coating 5～
10.
3. a kind of waste paper fibre for cement-based material Self-curing according to claim 1 and 2 is it is characterised in that institute
The alkyl surfactants stated are cetyl ammonium bromide or cetyl chloride ammonium.
4. the preparation method of the waste paper fibre for cement-based material Self-curing according to any one of claim 1-3,
It is characterized in that, the method adopts following steps:
(1) waste paper is completely soaked in water a period of time, pours in hydrabrusher, control pulping concentration is 5～15wt%,
Pulping temperature is 20～70 DEG C, and pulper rotating speed 200～850r/min, pulping 20～60min discongest to waste paper；
(2) paper pulp after discongesting part is immersed in after 2 hours in the naoh solution of 1～5wt% and carries out ultrasonic pretreatment, control
Ultrasonic power processed is 100～600w, and process time is 5～30min, and the concentration of ultrasonic paper pulp is 1～5wt%；
(3) paper pulp fiber after ultrasonic pretreatment is dried in electric drying oven with forced convection；
(4) prepare raw material according to formula；
(5) slurry load weighted waste paper secondary stock being made into 3～5wt% is dense, is subsequently poured into the other components except alkali resistant coating,
In electric blender, stirring 30～45min, to mix homogeneously, removes moisture removal, dries to constant weight；
(6) it is immersed in drying the paper pulp fiber obtaining to constant weight in step (5) in alkali resistant coating, through 30min under sonic oscillation
Paper pulp fiber is taken out in left and right, and is slowly dried 12 hours at 60 DEG C, that is, prepare product.
5. the preparation method of a kind of waste paper fibre for cement-based material Self-curing according to claim 4, its feature
It is, control pulping concentration to be 8～12wt% in step (1), pulping temperature is 40～60 DEG C, pulper rotating speed 300～500r/
Min, pulping 30～45min, discongest to waste paper.
6. the preparation method of a kind of waste paper fibre for cement-based material Self-curing according to claim 4, its feature
It is, the naoh solution concentration adopting in step (2) is 1～3wt%, ultrasonic power is 250～400w, process time is 10
～20min, the concentration of ultrasonic paper pulp is 1～3wt%.
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| CN109594412B (en) * | 2018-11-24 | 2021-03-30 | 广东松炀再生资源股份有限公司 | Slurry-slag dispersing agent and slurry-slag recycling process |
| CN111777366A (en) * | 2020-07-15 | 2020-10-16 | 浙江忠信新型建材股份有限公司 | Masonry mortar and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1405372A (en) * | 2002-08-20 | 2003-03-26 | 东北大学 | Method for preparing lignocellulose for road |
| CN101096835A (en) * | 2007-05-29 | 2008-01-02 | 南京林业大学 | Lignocellulose material for road and method for making same |
| CN103755190A (en) * | 2014-01-06 | 2014-04-30 | 同济大学 | Regenerated cellulose fiber and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1405372A (en) * | 2002-08-20 | 2003-03-26 | 东北大学 | Method for preparing lignocellulose for road |
| CN101096835A (en) * | 2007-05-29 | 2008-01-02 | 南京林业大学 | Lignocellulose material for road and method for making same |
| CN103755190A (en) * | 2014-01-06 | 2014-04-30 | 同济大学 | Regenerated cellulose fiber and preparation method thereof |
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