CN108546028A - A kind of Nano-meter SiO_22With the preparation method of PVA fiber reinforcement geopolymer mortars - Google Patents
A kind of Nano-meter SiO_22With the preparation method of PVA fiber reinforcement geopolymer mortars Download PDFInfo
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- CN108546028A CN108546028A CN201810804926.4A CN201810804926A CN108546028A CN 108546028 A CN108546028 A CN 108546028A CN 201810804926 A CN201810804926 A CN 201810804926A CN 108546028 A CN108546028 A CN 108546028A
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 105
- 239000000835 fiber Substances 0.000 title claims abstract description 98
- 229920002451 polyvinyl alcohol Polymers 0.000 title claims abstract description 96
- 235000019422 polyvinyl alcohol Nutrition 0.000 title claims abstract description 96
- 229920000876 geopolymer Polymers 0.000 title claims abstract description 93
- 230000002787 reinforcement Effects 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000010881 fly ash Substances 0.000 claims abstract description 16
- 239000012190 activator Substances 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims abstract description 13
- 239000006004 Quartz sand Substances 0.000 claims abstract description 12
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- 239000003638 reducing agent Substances 0.000 claims description 18
- NTHWMYGWWRZVTN-UHFFFAOYSA-N Sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 13
- 235000019353 potassium silicate Nutrition 0.000 claims description 11
- 229910052681 coesite Inorganic materials 0.000 claims description 7
- 229910052906 cristobalite Inorganic materials 0.000 claims description 7
- 229910052904 quartz Inorganic materials 0.000 claims description 7
- 239000000377 silicon dioxide Substances 0.000 claims description 7
- 229910052682 stishovite Inorganic materials 0.000 claims description 7
- 229910052905 tridymite Inorganic materials 0.000 claims description 7
- -1 metakaolin Substances 0.000 claims description 5
- 229920005646 polycarboxylate Polymers 0.000 claims description 4
- 238000007792 addition Methods 0.000 claims description 3
- 240000007594 Oryza sativa Species 0.000 claims 1
- 235000007164 Oryza sativa Nutrition 0.000 claims 1
- 235000009566 rice Nutrition 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 28
- 239000004567 concrete Substances 0.000 description 18
- 230000003014 reinforcing Effects 0.000 description 16
- 230000000694 effects Effects 0.000 description 12
- 239000004568 cement Substances 0.000 description 10
- 238000007906 compression Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- 239000002131 composite material Substances 0.000 description 7
- 230000002708 enhancing Effects 0.000 description 7
- 238000011068 load Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000010998 test method Methods 0.000 description 7
- 230000001070 adhesive Effects 0.000 description 6
- 239000011083 cement mortar Substances 0.000 description 6
- 230000003068 static Effects 0.000 description 6
- 239000002105 nanoparticle Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- 239000003513 alkali Substances 0.000 description 4
- 230000003321 amplification Effects 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 238000010621 bar drawing Methods 0.000 description 3
- 238000010348 incorporation Methods 0.000 description 3
- 230000036314 physical performance Effects 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 239000002956 ash Substances 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000875 corresponding Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000006062 fragmentation reaction Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000000977 initiatory Effects 0.000 description 2
- 239000002121 nanofiber Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- PZZYQPZGQPZBDN-UHFFFAOYSA-N Aluminium silicate Chemical compound O=[Al]O[Si](=O)O[Al]=O PZZYQPZGQPZBDN-UHFFFAOYSA-N 0.000 description 1
- 241000013987 Colletes Species 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 229910002796 Si–Al Inorganic materials 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000003213 activating Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 230000002742 anti-folding Effects 0.000 description 1
- 238000003556 assay method Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010430 carbonatite Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000002596 correlated Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000009920 food preservation Methods 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 229910001387 inorganic aluminate Inorganic materials 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052909 inorganic silicate Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Chemical compound O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 description 1
- 238000003823 mortar mixing Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 125000000914 phenoxymethylpenicillanyl group Chemical group CC1(S[C@H]2N([C@H]1C(=O)*)C([C@H]2NC(COC2=CC=CC=C2)=O)=O)C 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011433 polymer cement mortar Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 235000002639 sodium chloride Nutrition 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 235000019795 sodium metasilicate Nutrition 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000002194 synthesizing Effects 0.000 description 1
Classifications
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/006—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing mineral polymers, e.g. geopolymers of the Davidovits type
Abstract
The present invention discloses a kind of Nano-meter SiO_22With the preparation method of PVA fiber reinforcement geopolymer mortars, belong to inorganic polymeric material field, this method includes：2min will be stirred in blender by pretreated metakaolin, flyash and quartz sand, in the case where being stirred continuously, alkali-activator is added, continue to stir 2min, Nano-meter SiO_2 is added2Mixed liquor continues stirring 2min and PVA fibers is added in two portions in the case where being stirred continuously, stirs 2min every time to get Nano-meter SiO_22With PVA fiber reinforcement geopolymer mortars.The Nano-meter SiO_22There is good mechanical property and excellent bonding characteristic with PVA fiber reinforcement geopolymer mortars, there is very wide application prospect in fields such as building, road and bridge, water conservancy, military affairs.
Description
Technical field
The present invention relates to inorganic polymeric material fields, more particularly to a kind of Nano-meter SiO_22It polymerize with PVA fiber reinforcements
The preparation method of object mortar.
Background technology
Concrete and mortar are that more material is applied in hydraulic engineering and civil engineering, and pass is played in engineering construction
The effect of key.Over time, many concrete structures under wet environment or industrial environment occur in various degree
Corrosion failure, cause structure durability to decline, produce many unfavorable hidden danger, be badly in need of carrying out sectional repair reinforcing.There is data
Show that the country carries out tunnel-liner generally existing cracking situation using concrete, the length that cracks according to statistics accounts for about the five of total length
/ mono-；The industry of about half and civil buildings aging period are serious, and the problem of durability, concrete structure occurs in large amount of building
Building collapsing accident occurs frequent.Concrete-bridge safety coefficient in Foreign Expressway is relatively low, and dead weight is often
By the Government's Constraint.Cost ratio for safeguarding, rebuilding and repair greatly promotes.Coastal cities are the special ground of natural environment
Area, frequent occurrence due to sea salt action concrete structure breakoff phenomenon.Academia and engineering circles to the concrete that is destroyed into
Row reinforcing problem extensive concern.
Cement mortar is due to advantages such as at low cost, easy for construction, property stabilizations and as most mixed of application at present
Solidifying soil repairing and reinforcing material.But traditional cement mortar is again there is many intrinsic defects, as toughness is low, tensile strength is low,
Durability is insufficient, easy to crack etc., if as the patching material of concrete structure, certainly will will produce interfacial adhesion loosely
Gu, be easy phenomena such as cracking and leave security risk, moreover, that cement manufacturing industry can be made to bring is increasingly tight for the use of a large amount of cement
Energy consumption, resource consumption and the problem of environmental pollution of weight.Therefore, suitable concrete structural surface repairing and reinforcing and both is developed
Environmental protection and energy saving and long-lived New Reclaiming Material, to reducing maintenance cost and environment optimization and extending structure service life
It is of great significance.
Geopolymer be with the materials such as mineral and waste and silicoaluminate, acted on by alkali-activated carbonatite to be formed with
SiO4And AlO4The 3 D stereo reticular structure of tetrahedron element composition.Geopolymer is with high temperature resistance is good, intensity is high, resistance to
The good characteristics such as corrosivity and endurance quality have used the cheap waste such as flyash and dump slag in preparation process, section
About cost and pollutant discharge rate reduce environmental problem and significantly improve.In recent years, many researchers are polymerize using ground both at home and abroad
Object has made the geopolymer mortar or composite material that can be used for structural strengthening and repairing, and to its performance largely grind
Study carefully.
Geopolymer mortar is used for concrete structure repairing and reinforcement material, can energy saving and resource consumption, mitigate a large amount of
The environmental pollution that manufacture of cement is brought, simultaneously polymer mortar have good mechanical property, durability, fast hard solidification with
And adhesive property.Staple fiber can enhance the toughness of hardened mortar material, make the failure mode of mortar composite material by brittle break
Become ductile fracture, nano-particle can improve the microstructure of hardened mortar, improve the intensity of mortar material, can preferably improve
The endurance qualities such as frost resistance, resistant abrasion, impermeability, the Acid Rain aggressivity of mortar material.By same in geopolymer mortar
When add nano-particle and PVA staple fibers and will obtain not only energy conservation and environmental protection, but also with excellent mechanical performances, superhigh tenacity and
The concrete structure repairing reinforcement material of increased durability.
In recent years, the adhesive property of cement mortar was studied to have obtained the concern of numerous domestic and international researchers, including high-performance
The cutting performance and Split-tension of Rolled performance of cementitious composite mortar and concrete binding, fibre-forming polymer cement mortar and basal body interface
Adhesive property between adhesive property and cement mortar and reinforcing bar, while also proposed some research cement mortar and concrete
The new method of interfacial bond property.However, the studies above is carried out both for cement-based mortar greatly, it polymerize at present about ground
Object mortar and the research of concrete and reinforcing bar adhesive property are rarely reported.Nano-particle and fiber-reinforced modified effect polymerize over the ground
The influence of object mortar bonding performance will directly decide effect of the geopolymer composite mortar to concrete structure repairing and reinforcement, into
And before decide the application of nano-particle and fiber-reinforced modified geopolymer mortar in concrete structure repairing and reinforcement engineering
Scape.Therefore, a kind of the PVA fibers and Nano-meter SiO_2 of function admirable must be provided2Enhance geopolymer mortar, obtains novel repairing and add
Gu composite material, and it is used for engineering practice.
Invention content
The object of the present invention is to provide a kind of Nano-meter SiO_2s2With the preparation method of PVA fiber reinforcement geopolymer mortars, with
The above-mentioned problems of the prior art is solved, Nano-meter SiO_2 is made2There is good mechanics with PVA fiber reinforcement geopolymer mortars
Performance and excellent bonding characteristic.
To achieve the above object, the present invention provides following schemes：
The present invention provides a kind of Nano-meter SiO_22With the preparation method of PVA fiber reinforcement geopolymer mortars, it is characterised in that：
Include the following steps：
(1) pretreatment：Weigh raw water, metakaolin, flyash, quartz sand, alkali-activator, PVA fibers, nanometer
SiO2, water-reducing agent；
(2) Nano-meter SiO_22With the preparation of PVA fiber reinforcement geopolymer mortars：By metakaolin, the fine coal in step (1)
Ash and quartz sand stir 2min in blender, and in the case where being stirred continuously, alkali-activator is added, and continue to stir 2min, add
Enter Nano-meter SiO_22Mixed liquor continues stirring 2min and PVA fibers is added in two portions in the case where being stirred continuously, stirs every time
2min is to get Nano-meter SiO_22With PVA fiber reinforcement geopolymer mortars.
Preferably, in the step (1) water, metakaolin, flyash, quartz sand, alkali-activator, water-reducing agent mass ratio
It is 106：430：180：614：516：3.
Preferably, PVA fibers contents are 0~1.2% in the step (1).
Preferably, Nano-meter SiO_2 in the step (1)2Volume is 0~2.5%.
Preferably, in the step (1) alkali-activator by waterglass and sodium hydroxide in mass ratio 445：71 mix and group
At.
Preferably, Nano-meter SiO_2 in the step (2)2Mixed liquor is by Nano-meter SiO_22It is added in water and water-reducing agent mixed liquor
It stirs evenly.
Preferably, the water-reducing agent is polycarboxylate water-reducer.
The invention discloses following technique effects：
(1) compared with common inorganic silicon aluminum cementitious material, geopolymer has the characteristics that very much：Quite outstanding is durable
Performance；It is not necessarily to " two mills one are burnt " technique in the preparation, saves vast resources and the energy；Substantially CO is not discharged2, economical environment-protective；It takes
Material is convenient, using trade wastes such as resourceful, cheap natural Si-Al materials or flyash, slags as raw material；
It is fast hard, early strong, and later strength is high；Lower shrinkage, hypotonicity；High temperature resistant, good heat-insulation effect, coefficient of thermal expansion (CTE) is adjustable；
It can fixing metal ions.Before these features make it have very wide application in fields such as building, road and bridge, water conservancy, military affairs
Scape.
(2) its mechanical property and endurance quality will be improved in geopolymer mortar incorporation nanosized SiO_2 and PVA fibers and glued
Junction characteristic.Geopolymer mortar material mixes proper amount of nano SiO2After can increase C-S-H gels chain length, generate little particle filling effect
It answers, improves the structure and performance of cement slurry, that is, improve the mechanical properties such as its early stage resistance to compression, tension and flexural strength, reinforce it
The endurance qualities such as impermeability, frost resistance, anti-carbonation, resistant abrasion.After geopolymer mortar material mixes appropriate PVA fibers, it can produce
Raw the strain-hardening behavior and multiple cracking cracking phenomena can improve its resistance to deformation, shearing resistance, bending resistance, antidetonation, impact resistance and resistance to
Long property, ultimate tensile strength.
(3) polycarboxylate water-reducer has peptizaiton in the present invention, can solve Nano-meter SiO_22It is added directly into meeting in water
The problem for occurring to reunite and then reduce activity, geopolymer mortar add Nano-meter SiO_2 when being molded2It can reduce to alkali environment
It influences, so that it is given full play to activity, make Nano-meter SiO_22Particle and PVA fiber reinforcement geopolymers have performance that is good, stablizing.
Description of the drawings
Fig. 1 is 3 Nano-meter SiO_2 of the embodiment of the present invention2With PVA fiber reinforcement geopolymer mortar composite material process plannings
Figure.
Specific implementation mode
It is clearly and completely described below in conjunction with the technical solution in the embodiment of the present invention, it is clear that described reality
It is only a part of the embodiment of the present invention to apply example, instead of all the embodiments.Based on the embodiments of the present invention, this field is general
The every other embodiment that logical technical staff is obtained without making creative work belongs to what the present invention protected
Range.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, With reference to embodiment
The present invention is described in further detail.
1 Nano-meter SiO_2 of embodiment2Raw material is prepared with PVA fiber reinforcement geopolymer mortars
Nano-meter SiO_2 is prepared in the present embodiment2With the material used in PVA fiber reinforcement geopolymer mortars mainly have water, partially
Kaolin, flyash, waterglass, sodium hydroxide, quartz sand, PVA fibers, Nano-meter SiO_22, water-reducing agent etc., the property of raw materials
The sufficient test requirements document at the expiration of energy index, it is specific as follows：
Metakaolin：The metakaolin that experiment is produced using Shijiazhuang Chen Xing Industrial Co., Ltd.s, chemical composition and object
Rationality can be shown in Tables 1 and 2.
1 metakaolin main chemical compositions of table
2 metakaolin Main physical performance of table
Flyash：Present invention experiment is using I grade of flyash of Datang Luoyang Power Co., Ltd. production, Main physical
Performance is shown in Table 3.
3 flyash Main physical performance of table
Quartz sand:Present invention experiment is using the special fine quartz sand of Yuan Heng water-purifying materials factory of Gongyi City production, corresponding grain size model
Enclose is 75-120 μm.
Waterglass:The waterglass (sodium metasilicate) that present invention experiment is produced using the auspicious ceramic Co., Ltd of Zhengzhou City Henan Province dragon
Solution, leading indicator are shown in Table 4.
4 waterglass leading indicator of table
Sodium hydroxide:The present invention is tested using the sheet NaOH produced by Ningxia Jin Hai Xin Wu Fine Chemical Co., Ltd,
Purity is up to 99.0%.
PVA fibers:Present invention experiment is using the PVA fibers of Kuraray Co., Ltd. production, main performance index such as following table
5。
The performance indicator of 5 PVA fibers of table
Nano-meter SiO_22:The Nano-meter SiO_2 that present invention experiment is produced using Hangzhou Wanjing New Material Co., Ltd.2, main performance refers to
Mark such as the following table 6.
6 Nano-meter SiO_2 of table2Main performance index
Water-reducing agent:The present invention is tested using the water-reducing agent produced by Jiangsu stars Chemical Co., Ltd., specific performance index
It see the table below 7.
7 water-reducing agent main performance index of table
Water:Test water of the present invention produces for Zhengzhou Water Company, and testing result is shown in Table 8.
8 water leading indicator of table
2 Nano-meter SiO_2 of embodiment2With PVA fiber reinforcement geopolymer Mortar Mixing Ratio Design and Experiments
The embodiment of the present invention investigates PVA fibers contents, Nano-meter SiO_22Volume factor is to Nano-meter SiO_22With PVA fiber reinforcements
The influence of polymer mortar mechanical property, therefore control variate method is used when carrying out mix-design, i.e., fixed water-cement ratio, glue
Sand ratio, modulus of water glass and sharp glue ratio (alkali-activator and cementitious material ratio) and single change PVA fibers contents or nanometer
SiO2Volume.
The optimum proportioning and dosage of NaOH and waterglass needed for the synthesis of mix-design geopolymer of the embodiment of the present invention,
Water-cement ratio (external adding water, alkali-activator aqueous and cementitious material mass ratio) is determined as 0.65, cement mortar rate 1:1.Flyash
Equivalent replaces the metakaolin of 30% mass, alkali activating agent solution to be made of solid sodium hydroxide, waterglass and water.At the beginning of waterglass
Beginning modulus is 3.2, and it is 1.3 that modulus of water glass, which adjusts and calculates into waterglass reinforcing body sodium hydroxide by modulus adjustment, later
Water is added, sodium oxide molybdena mass fraction in solution is adjusted to 15%.
Fiber used in the embodiment of the present invention is PVA fibers, volume volume is respectively 0,0.2%, 0.4%, 0.6%,
0.8%, 1.0%, 1.2%.
Nano-particle used in the embodiment of the present invention is Nano-meter SiO_22, volume 0,0.5%, 1.0%, 1.5%,
2.0%, 2.5%, Nano-meter SiO_22Particle equivalent replaces metakaolin and flyash.
1m3Nano-meter SiO_22It is shown in Table 9 with a variety of materials dosage in PVA fiber reinforcement geopolymer mortars.
9 1m of table3Nano-meter SiO_22With a variety of materials dosage in PVA fiber reinforcement geopolymer mortars
M represents non-adding of fiber and Nano-meter SiO_2 in table2Benchmark polymer mortar, N represents Nano-meter SiO_22Gather on enhancing ground
Object mortar is closed, P represents PVA fiber reinforcement geopolymer mortars, and PN represents Nano-meter SiO_22With PVA fiber reinforcement geopolymer sand
Slurry.
First digit represents PVA fibers contents, and second digit represents Nano-meter SiO_22Volume.Such as PN-0.6-2.5 generations
Table PVA fibers contents are 0.6%, the Nano-meter SiO_2 that nanosized SiO_2 volume is 2.5%2Particle and PVA fiber reinforcement geopolymer sand
Slurry.
3 Nano-meter SiO_2 of embodiment2With PVA fiber reinforcement geopolymer mortar preparation processes
Preparing Nano-meter SiO_22When with PVA fiber reinforcement geopolymer mortars, it is to be ensured that Nano-meter SiO_22, PVA fibers are in matrix
In can be uniformly distributed and freely disperse, to obtain the repairing mortar material of excellent mechanical performances, to reach test requirements document need
Select suitable preparation method and technique, Nano-meter SiO_22With PVA fiber reinforcement geopolymer mortar composite material process plannings
As shown in Figure 1, being as follows：
(1) pretreatment：Weigh raw water, metakaolin, flyash, quartz sand, alkali-activator, PVA fibers, nanometer
SiO2, water-reducing agent；
(2) Nano-meter SiO_22With the preparation of PVA fiber reinforcement geopolymer mortars：By metakaolin, the fine coal in step (1)
Ash and quartz sand stir 2min in blender, and in the case where being stirred continuously, alkali-activator is added, and continue to stir 2min, add
Enter Nano-meter SiO_22Mixed liquor continues stirring 2min and PVA fibers is added in two portions in the case where being stirred continuously, stirs every time
2min is to get Nano-meter SiO_22With PVA fiber reinforcement geopolymer mortars.
For the PVA fibers of Kuraray Corporation production, preferably due to its dispersibility, so will during raw material mix
In its a small amount of repeatedly addition blender and stirring duration is appropriately extended.For Nano-meter SiO_22Material is mixed there are two types of common
Enter method：One is in the dry state will be in Nano-meter SiO_22It throws into blender and is stirred simultaneously with other materials, adding
This method ensures that each material is uniformly mixed before water；Another kind is by Nano-meter SiO_22Water is added to stir with water-reducing agent mixed liquor
After mixing uniformly, it is then added in geopolymer.Although Nano-meter SiO_22With hydrophily, but since small-size effect and surface are imitated
It answers, if activity can be occurred to reunite and then reduce by being added directly into water, but polycarboxylate water-reducer has peptizaiton
It can solve the problems, such as this.Importantly, geopolymer mortar adds Nano-meter SiO_2 when being molded2It can reduce to alkali environment
Influence.Therefore activity can just be given full play to using second method, makes Nano-meter SiO_22Particle and PVA fiber reinforcement geopolymers
With performance that is good, stablizing.
Mortar is packed into die trial, vibrate, plaster after coupon level is placed at room temperature, for 24 hours afterwards demoulding be put into standard curing
Room (20 ± 2 DEG C of temperature, 95% or more relative humidity), test specimen takes out after reaching 28 day age and carries out correlation test.
4 Nano-meter SiO_2 of embodiment2With PVA fiber reinforcement geopolymer mortar tests
The embodiment of the present invention is in the case where other materials dosage is constant in ensureing geopolymer mortar, when pouring test specimen
Single change PVA fibers contents (0.2%, 0.4%, 0.6%, 0.8%, 1.0%, 1.2%) or Nano-meter SiO_22Volume (0.5%,
1.0%, 1.5%, 2.0%, 2.5%), pass through and carry out slump flow test experiment, basic mechanical experiment, static(al) compression elasticity modulus
Experiment, fracture property experiment, two-sided cutting adhesion test and reinforcing bar drawing adhesion test study Nano-meter SiO_22Increase with PVA fibers
Working performance, mechanical property, fracture property, static(al) compression elasticity modulus and the adhesion properties of strength fly-ash geopolymer mortar.
Specific content of the test is shown in Table 10.
10 Nano-meter SiO_2 of table2With the specific content of the test of PVA fiber reinforcement geopolymer mortars
The assay method of technical indicator about the present invention is to use standard method in the art, and for details, reference can be made to newest
National standard, unless otherwise stated.In an embodiment of the present invention, cubic compressive strength experiment uses《Building mortar base
This performance test method standard》(JGJT70-2009) in chapter 9 defined test method and sample dimensions (70.7mm ×
70.7mm × 70.7mm, pressure-bearing surface are 70.7mm × 70.7mm), small cubes compressive strength test uses《Ferro-cement is used
Mortar mechanical test method》The test method of chapter 7 defined and flexural strength experiment folding in (GB/T 7897-2008)
Size corresponding to half of having no progeny test specimen (pressure-bearing surface is 40mm × 40mm), axial compressive strength experiment uses《Ferro-cement is used
Mortar mechanical test method》The test method and sample dimensions (40mm of chapter 9 defined in (GB/T 7897-2008)
× 40mm × 160mm, pressure-bearing surface are 40mm × 40mm), flexural strength experiment uses《Ferro-cement is tried with mortar mechanical property
Proved recipe method》The test method and sample dimensions (40mm × 40mm × 160mm) of chapter 6 defined in (GB/T 7897-2008).
About two-sided cutting adhesion test, which completes in the Henan proving grounds water-saving Ke Yuan, and experiment instrument is
The 1000kN microcomputer controlled electro-hydraulic servo universal testing machines of Jinan prosperous phototesting machine Manufacturing Co., Ltd production.Test procedure is：
(1) test specimen is positioned over to the centre position of concave pedestal, make shear test block both sides geopolymer mortar reinforcing layer with
Base contacts are allowed to be formed the shearing of polymer mortar reinforcing layer and concrete layer bonding interface over the ground.Again in top board and examination
Billet is placed between part；
(2) it clicks start button and starts electro-hydraulic servo testing machine, loading velocity is controlled in 1kN/s, and uniformly continuous is slowly
Load；
(3) after test specimen destroys suddenly, instrument is resetted, food preservation test data.
About reinforcing bar drawing adhesion test, which completes in Xinxiang Shui Keyuan, Henan proving ground, and experiment uses
2000kN universal hydraulic testing machines carry out unidirectional drawing to test specimen, before load, by screwed upper connecting rod by being pressed from both sides on testing machine
Head steps up, and is linked with load transducer；Then counter-force lower end weighted platform is placed on to link with sensor using flexural pivot bar,
Flexural pivot bar makes drawing carry out in an axial direction and avoids it to deviate that axial there is a situation where diagonal tension failures；Test specimen is finally put in counter-force
On frame, the long end of reinforcing bar is accommodated by the lower collet of testing machine；Reaction frame and placement 10mm thicker strip hole steel on mortar specimen contact surface
Plate；Displacement meter is arranged in reinforcing bar free end, the total slippage in acquisition free end；The displacement of loading procedure and payload data are by eastern China
DH3816N static strains Acquisition Instrument is with 2.5s/ frequency collection.
5 Nano-meter SiO_2 of embodiment2With PVA fiber reinforcement geopolymer mortar test conclusions
Present invention determine that Nano-meter SiO_22With the match ratio of PVA fiber reinforcement geopolymer mortars, pass through slump flow test
Experiment, basic mechanical performance experiment (including cubic compressive strength experiment, axial compressive strength experiment, small cubes after anti-folding
Compressive strength test and flexural strength experiment), static(al) compression elasticity modulus test, fracture property experiment, slump flow test experiment,
Two-sided cutting adhesion test and reinforcing bar drawing adhesion test, have studied Nano-meter SiO_22Volume, PVA fibers contents are to geopolymer sand
Starch the influence of correlated performance.The result shows that：
(1) Nano-meter SiO_22With the addition of PVA fibers so that the mobility of geopolymer mortar changes, and PVA fibers are mixed
Enter into geopolymer mortar, Nano-meter SiO_2 can be made2It is reduced with the workability of PVA fiber reinforcement geopolymer mortars, and PVA is fine
The dimension bigger workability of volume reduces more apparent.Nano-meter SiO_22It is incorporated into geopolymer mortar, Nano-meter SiO_2 can be made2With PVA fibres
The workability first increases and then decreases of dimension enhancing geopolymer mortar.
(2) after PVA fibers are incorporated into geopolymer mortar, (0-0.8%) can polymerize with making within the scope of certain volume
The compression strength of object mortar gradually increases, and later as PVA fibers contents increase to 1.2%, geopolymer compressive property is gradual
Decline, but still reinforced with commonly polymer phase ratio performance, so appropriate PVA fibers can effectively enhance geopolymer
Compressive property, and its optimum adding quantity of pulverized is 0.8%.Nano-meter SiO_22It, can be in certain volume model after being incorporated into geopolymer mortar
(0-1.5%) makes the compression strength of geopolymer mortar enhance in enclosing, later with Nano-meter SiO_22Volume continues to increase to
2.5%, there is downward trend in the compression strength of geopolymer mortar, so proper amount of nano SiO2Geopolymer can effectively be enhanced
Compressive property, and its optimum adding quantity of pulverized is 1.5%.
(3) after the PVA fibers of 0-1.2% volumes are incorporated into geopolymer mortar, Nano-meter SiO_2 is whether mixed2Gather on ground
The fracture resistance for closing object mortar all gradually increases, and reaches maximum value when volume is 1.2%, it was demonstrated that appropriate PVA fiber energy
Enough effectively enhancing geopolymer fracture resistances.The Nano-meter SiO_2 of 0-2.5% volumes2After being incorporated into geopolymer mortar, whether
The fracture resistance of incorporation PVA fiber geopolymer mortars all gradually increases, and reaches maximum value when volume is 2.5%, demonstrate,proves
Bright proper amount of nano SiO2Geopolymer fracture resistance can effectively be enhanced.
(4) after PVA fibers are incorporated into geopolymer mortar, Nano-meter SiO_2 is whether mixed2Its static(al) compression elasticity modulus
It all presents and first increases (when PVA fibers contents are 0-0.8%) reduction (when PVA fibers contents are 0.8%-1.2%) trend afterwards.When
Nano-meter SiO_22Volume be fixed as 0, PVA fibers contents be 0.8% when, geopolymer mortar elasticity modulus reaches maximum value
15.6GPa, amplification 38.1%；Work as Nano-meter SiO_22Volume be fixed as 1.0%, PVA fibers contents be 0.8% when, geopolymer
Mortar elasticity modulus reaches maximum value 17.0GPa, amplification 18.9%.Nano-meter SiO_22After being incorporated into geopolymer mortar, no matter
Whether PVA fibers mix its static(al) compression elasticity modulus and first increase (Nano-meter SiO_2 are all presented2When volume is 0-1.5%) reduce afterwards
(Nano-meter SiO_22When volume is 1.5%-2.5%) trend.When PVA fibers contents are fixed as 0, Nano-meter SiO_22When volume is 1.5%,
Geopolymer mortar elasticity modulus reaches maximum value 14.9GPa, amplification 31.9%；When PVA fibers contents are fixed as 0.6%,
Nano-meter SiO_22When volume is 1.5%, geopolymer mortar elasticity modulus reaches maximum value 16.3GPa, amplification 14%.
(5) after PVA fibers are incorporated into geopolymer mortar, its peak load P can greatly be improvedmax, effective fracture
Length ac, initiation angleToughnessWith energy to failure GF, these fragmentation parameters when PVA fibers contents gradually increase,
It all presents and first increases the trend that (0-1.0%) reduces (1.0%-1.2%) afterwards, and they assign in 1.0% volume and reach
Maximum value.Nano-meter SiO_22After being incorporated into geopolymer mortar, its peak load P can be improved to a certain extentmax, effectively split
Stitch length ac, initiation angleToughnessWith energy to failure GF, these fragmentation parameters are in Nano-meter SiO_22Volume gradually increases
When, it all presents and first increases the trend that (0-1.5%) reduces (1.5%-2.5%) afterwards, and they reach under 1.5% volume
Reach maximum value.
(6) after PVA fibers mix in geopolymer mortar and nanometer geopolymer mortar, in its 0~0.8% volume model
Its shear strength can be made to improve to a certain extent in enclosing, with continuing to increase for PVA fibers contents, shear strength subtracts
Small situation.And continuously adding with PVA fibers contents, shear strength reduce notable.Nano-meter SiO_22It is incorporated into geopolymer
After in mortar and PVA fiber geopolymer mortars, shear strength can be made to increase within the scope of its 1%~2% volume, carried
High-amplitude is relatively small, with Nano-meter SiO_22Volume continuously adds, and shear strength continuously decreases.
(7) PVA fibers and Nano-meter SiO_22The failure by shear form for enhancing geopolymer mortar and concrete is straight regular
Adhesive surface destroy or repairing mortar is broken, and it is that original concrete is inlaid into geopolymer mortar that III type, which destroys interface,
Interface roughness is the principal element for influencing interfacial adhesion, and III bond effect of interface type is best.
(8) after PVA fibers incorporation geopolymer mortar, the bonding for effectively raising geopolymer mortar and reinforcing bar is strong
Degree, and as gradual increase tendency is presented in the increase of its volume, adhesion test PVA fibers contents are optimal when being 0.6%-0.8%.
Nano-meter SiO_22After being incorporated into geopolymer mortar and fiber geopolymer mortar, the adhesion strength of reinforcing bar-geopolymer mortar with
Nano-meter SiO_22The whole trend in first increases and then decreases of increase of volume, increase and decrease amplitude is smaller, and in Nano-meter SiO_22Volume is
When 0.5%, there is the case where slightly reducing in the affecting laws of similar shear strength.Its humidification the optimum mix amount is in 1.5%-
2%.After this volume range, the Nano-meter SiO_2 of bigger2Volume can not improve adhesion strength.
Embodiment described above is only that the preferred embodiment of the present invention is described, and is not carried out to the scope of the present invention
It limits, under the premise of not departing from design spirit of the present invention, those of ordinary skill in the art make technical scheme of the present invention
Various modifications and improvement, should all fall into claims of the present invention determination protection domain in.
Claims (7)
1. a kind of Nano-meter SiO_22With the preparation method of PVA fiber reinforcement geopolymer mortars, it is characterised in that：Include the following steps：
(1) pretreatment：Weigh raw water, metakaolin, flyash, quartz sand, alkali-activator, PVA fibers, Nano-meter SiO_22、
Water-reducing agent；
(2) Nano-meter SiO_22With the preparation of PVA fiber reinforcement geopolymer mortars：By in step (1) metakaolin, flyash and
Quartz sand stirs 2min in blender, and in the case where being stirred continuously, alkali-activator is added, and continues to stir 2min, addition is received
Rice SiO2Mixed liquor continues stirring 2min and PVA fibers is added in two portions in the case where being stirred continuously, stirs every time
2min is to get Nano-meter SiO_22With PVA fiber reinforcement geopolymer mortars.
2. a kind of Nano-meter SiO_2 according to claim 12It is special with the preparation method of PVA fiber reinforcement geopolymer mortars
Sign is：Water in the step (1), metakaolin, flyash, quartz sand, alkali-activator, water-reducing agent mass ratio be 106：
430：180：614：516：3.
3. a kind of Nano-meter SiO_2 according to claim 12It is special with the preparation method of PVA fiber reinforcement geopolymer mortars
Sign is：PVA fibers contents are 0~1.2% in the step (1).
4. a kind of Nano-meter SiO_2 according to claim 12It is special with the preparation method of PVA fiber reinforcement geopolymer mortars
Sign is：Nano-meter SiO_2 in the step (1)2Volume is 0~2.5%.
5. a kind of Nano-meter SiO_2 according to claim 12It is special with the preparation method of PVA fiber reinforcement geopolymer mortars
Sign is：Alkali-activator is by waterglass and sodium hydroxide in mass ratio 445 in the step (1)：71 mix and form.
6. a kind of Nano-meter SiO_2 according to claim 12It is special with the preparation method of PVA fiber reinforcement geopolymer mortars
Sign is：Nano-meter SiO_2 in the step (2)2Mixed liquor is by Nano-meter SiO_22Water is added to stir evenly with water-reducing agent mixed liquor
It forms.
7. a kind of Nano-meter SiO_2 according to claim 12It is special with the preparation method of PVA fiber reinforcement geopolymer mortars
Sign is：The water-reducing agent is polycarboxylate water-reducer.
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| CN109801686A (en) * | 2019-03-15 | 2019-05-24 | 郑州大学 | Reinforcing bar and Nano-meter SiO_22Bond-slip models between PVA fiber reinforcement geopolymer mortar |
| CN111574136A (en) * | 2020-06-30 | 2020-08-25 | 郑州大学 | High-temperature-resistant geopolymer mortar and preparation method thereof |
| CN111704400A (en) * | 2020-06-30 | 2020-09-25 | 郑州大学 | High-durability geopolymer mortar and preparation method thereof |
| CN111704399A (en) * | 2020-06-30 | 2020-09-25 | 郑州大学 | High-rheological-property geopolymer mortar and preparation method thereof |
| CN111718159A (en) * | 2020-07-01 | 2020-09-29 | 南京工业大学 | Recycled FRP powder geopolymer concrete and preparation method thereof |
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| CN112645647A (en) * | 2020-12-30 | 2021-04-13 | 同济大学 | Nano-silica modified geopolymer anticorrosive mortar and preparation method thereof |
| CN114804740A (en) * | 2022-05-24 | 2022-07-29 | 郑州大学 | Preparation method of polymer concrete reinforced by hybrid fibers and nano materials |
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| CN109801686A (en) * | 2019-03-15 | 2019-05-24 | 郑州大学 | Reinforcing bar and Nano-meter SiO_22Bond-slip models between PVA fiber reinforcement geopolymer mortar |
| CN109801686B (en) * | 2019-03-15 | 2022-09-09 | 郑州大学 | Bonding slippage model between steel bar, nano SiO2 and PVA fiber reinforced geopolymer mortar |
| CN112551953A (en) * | 2020-06-02 | 2021-03-26 | 浙江理工大学 | Fly ash-based polymer mortar repair material and preparation method thereof |
| CN111574136A (en) * | 2020-06-30 | 2020-08-25 | 郑州大学 | High-temperature-resistant geopolymer mortar and preparation method thereof |
| CN111704400A (en) * | 2020-06-30 | 2020-09-25 | 郑州大学 | High-durability geopolymer mortar and preparation method thereof |
| CN111704399A (en) * | 2020-06-30 | 2020-09-25 | 郑州大学 | High-rheological-property geopolymer mortar and preparation method thereof |
| CN111718159A (en) * | 2020-07-01 | 2020-09-29 | 南京工业大学 | Recycled FRP powder geopolymer concrete and preparation method thereof |
| CN111718159B (en) * | 2020-07-01 | 2022-04-26 | 南京工业大学 | Recycled FRP powder geopolymer concrete and preparation method thereof |
| CN112645647A (en) * | 2020-12-30 | 2021-04-13 | 同济大学 | Nano-silica modified geopolymer anticorrosive mortar and preparation method thereof |
| CN112645647B (en) * | 2020-12-30 | 2022-08-26 | 同济大学 | Nano-silica modified geopolymer anticorrosive mortar and preparation method thereof |
| CN114804740A (en) * | 2022-05-24 | 2022-07-29 | 郑州大学 | Preparation method of polymer concrete reinforced by hybrid fibers and nano materials |
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Application publication date: 20180918 |