CN104496337B - Nano clay modified fiber cement mortar and preparation method thereof - Google Patents
Nano clay modified fiber cement mortar and preparation method thereof Download PDFInfo
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- CN104496337B CN104496337B CN201510014364.XA CN201510014364A CN104496337B CN 104496337 B CN104496337 B CN 104496337B CN 201510014364 A CN201510014364 A CN 201510014364A CN 104496337 B CN104496337 B CN 104496337B
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- cement mortar
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Abstract
The present invention relates to a kind of nano clay modified fiber cement mortar and preparation method thereof, belong to concrete preparation field.A kind of nano clay modified fiber cement mortar, described cement mortar is made up of gel rubber material, nanoclay particle, PVA fiber, plasticiser, water reducer, quartz sand and water: wherein, gel rubber material by mass percentage by 60～70% flyash and surplus cement form；Nanoclay particle is the 1% of Binder Materials weight；Plasticiser is the 0.1%～0.2% of Binder Materials weight；Water reducer is the 0.3～0.5% of Binder Materials weight, and quartz sand is the 30%～35% of Binder Materials weight；Water-cement ratio is 0.25～0.35；The volume of PVA fiber is the 1%～2% of cement mortar cumulative volume.The nano clay modified fiber cement mortar of gained of the present invention, takes full advantage of nanoclay particles and the particular utility of PVA fiber, it is possible to significantly improve Anti-Chloride Ion Penetration and the mechanical property of cement matrix.
Description
Technical field
The present invention relates to a kind of nano clay modified fiber cement mortar and preparation method thereof, belong to concrete preparation neck
Territory.
Background technology
In recent years, along with increasingly the maximizing of gap bridge vehicle, the increasing rapidly of heavy-duty and the volume of traffic, vehicle is to bridge
The frequency that the impulsive force of beam and stress exceed is consequently increased, and the impact on component fatigue is increasing.This just makes
Obtaining bridge deck pavement and be in the harshest use state, the situation that reinforced concrete bridge deck pave-load layer destroys happens occasionally.
There is the form destroyed in reinforced concrete bridge deck pave-load layer, typically the most identical with other concrete components, have crack, abrasion,
Peel off, dew muscle, steel bar corrosion, serious there is also fragmentation, come off, cave etc., how to damage bridge structure
Carry out repairing and reinforcement, extend the service life of bridge structure, it has also become focus of attention problem both at home and abroad.
Summary of the invention
In view of the above problems, the present invention have developed and a kind of changes in order to the nanoclay of maintenance and reinforcement after solving girder construction damage
Property fiber cement mortar, the anti-chlorine salt penetration superior due to it and high tenacity, it is possible to be effective against harmful environmental material
Erosion and the continuous action of vehicular load, such that it is able to be effectively improved safety and the usability of bridge structure, extend
The service life of bridge structure.
A kind of nano clay modified fiber cement mortar, described cement mortar is by gel rubber material, nanoclay particle, PVA
Fiber, plasticiser, water reducer, quartz sand and water are made:
Wherein, gel rubber material by mass percentage by 60～70% flyash and surplus cement form；
Nanoclay particle is the 1% of Binder Materials weight；Plasticiser is the 0.1%～0.2% of Binder Materials weight；Diminishing
Agent is the 0.3～0.5% of Binder Materials weight, and quartz sand is the 30%～35% of Binder Materials weight；
Water-cement ratio is 0.25～0.35；The volume of PVA fiber is the 1%～2% of cement mortar cumulative volume.
Nanoclay particle of the present invention is nano kaoline particle, and its mean diameter is 300～500nm, average sheet
Layer thickness is 20～50nm.Owing to its granule belongs to nanometer scale, there is significant small-size effect and volcano ash effect,
Can the micro-pore of filling concrete mortar matrix, and the carrying out of hydrated reaction of cement can be promoted, optimize cement
The pore structure of mortar matrix, adds the density of matrix such that it is able to is effective against harmful environmental material and invades coagulation
Inside soil structure.
PVA fibre tensile strength of the present invention is high, elastic modelling quantity is high；When nanoclay and PVA fiber are with suitable
In ratio adds cement matrix to, both are during hardening of cement, can well play respective unique advantage,
Improve anti-chlorine salt penetration and the non-deformability of cement matrix.The preferred described PVA fiber of the present invention a diameter of
40 μm, a length of 12mm, density is 13g/cm3。
Water-cement ratio of the present invention refers to the weight ratio of water and gel rubber material.
Flyash described in all technical schemes of the present invention is preferably I grade flyash, and particle diameter is 1.1～1.8 μm.
The diminishing that can be used for cement that described in all technical schemes of the present invention, water reducer is known to those skilled in the art
Agent, preferably polycarboxylate analog high efficiency water reducing agent.
Described in all technical schemes of the present invention, plasticiser is hydroxypropyl methyl cellulose.
Cement mortar of the present invention is prepared the most as follows: first by nanoclay particle ultrasonic disperse in water
15 minutes, then be mixed and stirred for uniformly with water reducer, then by PVA fiber, cement, quartz sand, flyash,
Plasticiser stirs 5 minutes in agitated kettle, finally by the mixed liquor of nanoclay particle Yu water reducer, pours agitated kettle into
Middle continuation stirs 5 minutes.
The invention has the beneficial effects as follows: the nano clay modified fiber cement mortar of gained of the present invention, take full advantage of and receive
Rice clay particle and the particular utility of PVA fiber, it is possible to significantly improve the Anti-Chloride Ion Penetration of cement matrix, anti-
Oozing property improves 20%～30%；Mechanical property improves 25%～35%, and its sag is up to 20mm～30mm, it is possible to
The effect of good adaptation bridge structure cyclic reverse loading, can significantly improve structure repair consolidation effect, extending structure
Service life,
Accompanying drawing explanation
Accompanying drawing 2 width of the present invention,
Fig. 1 (a) is the microscopic appearance photo of nanoclay；
Fig. 1 (b) is the microscopic appearance photo of flyash.
Detailed description of the invention
Following non-limiting example can make those of ordinary skill in the art that the present invention be more fully understood, but not with
Any mode limits the present invention.
Embodiment 1
(1) nanoclay used by the present invention is nano kaoline (Hebei), and average particulate diameter is 300～500nm,
Average platelet thickness is 20～50nm, and Fig. 1 (a) gives the microstructure of nanoclay；Flyash is I grade of fine coal
Ash (Dalian), its grain diameter is 1.1～1.8 μm, and Fig. 1 (b) gives the microscopic appearance of flyash；Diminishing used
Agent is polycarboxylate analog high efficiency water reducing agent (Dalian)；Cement (the PO 42.5R Portland cement in little Ye field, Dalian)；
Sand is quartz sand, and grain diameter is 110 μm～220 μm；Plasticiser used is hydroxypropyl methyl cellulose (HPMC)
(Tai'an).
(2) nano clay modified fiber cement mortar test specimen match ratio is tested
Selecting water-cement ratio in this test is w/b=0.34, and flyash accounts for the 66.6% of Binder Materials, and fibers content is mixing
The 2% of thing cumulative volume, water reducer volume is the 0.4% of Binder Materials, and plasticiser volume is the 0.2% of Binder Materials, nanometer
Clay additive is 1%, and concrete match ratio is shown in Table 1.
Table 1 concrete mix (kg/m3)
| Test specimen is numbered | Quartz sand | Cement | Flyash | Water | Water reducer | Plasticiser | Fiber | Nanoclay |
| N1 | 403 | 385 | 768 | 393 | 5 | 2.3 | 0 | 0 |
| N2 | 403 | 385 | 768 | 393 | 5 | 2.3 | 0 | 11.5 |
| N3 | 403 | 385 | 768 | 393 | 5 | 2.3 | 26 | 0 |
| N4 | 403 | 373.5 | 768 | 393 | 5 | 2.3 | 26 | 11.5 |
Weighing various types of materials mixing mortar specimen according to above-mentioned match ratio, chloride permeability sample dimensions is
Φ 100mm × 100mm cylinder, anti-folding sample dimensions is length × width × height=l × b × h=400 × 100 × 15mm, and test specimen calculates
Across footpath l0=300mm, the sample dimensions of cubic compressive strength test is 70.7 × 70.7 × 70.7mm, and test material preparation completes
After maintenance in standard curing room (temperature is 20 ± 1 DEG C, relative humidity >=95%), form removal after 1 day, be further continued for maintenance
Tested to 28 day age.
(3) experimental facilities
Chloride permeability test uses the RCM-DAL type chloride diffusion coefficient analyzer that Beijing Nai Er company produces；
Compressive strength test uses YAW-YAW2000A type 200t microcomputer controlled electro-hydraulic servo pressure testing machine, and loading velocity is
0.6MPa/s；Bending test uses 30t closed loop hydraulic servo Material Testing Machine, and loading velocity is 0.15mm/min.
(4) result of the test
When age is tested in mortar specimen maintenance to 28 day, take out chloride permeability test specimen and resistance to compression, anti-folding test specimen are carried out
Chloride permeability test and mechanical property test, by measure chloride diffusion coefficient, comprcssive strength, bending resistance load,
Sag evaluates mortar resistance of chloride ion penetration and mechanical property, and concrete result of the test is as follows.
A, chloride permeability are tested
Table 2 chloride diffusion coefficient
| Test test specimen | Chloride diffusion coefficient/m2/s | Increased percentage/% |
| N1 | 1.83862E-11 | - |
| N2 | 1.44856E-11 | 21.21% |
| N3 | 1.58867e-11 | 13.59% |
| N4 | 1.17120e-11 | 36.30% |
Table 2 gives concrete chloride diffusion coefficient, thus can obtain, and nanoclay and fiber jointly act on and can significantly change
The permeance property of kind cement mortar, improves the Anti-Chloride Ion Penetration of mortar.
B, compressive strength test
Table 3 comprcssive strength
| Test test specimen | Comprcssive strength/MPa | Increased percentage/% |
| N1 | 28.6 | |
| N2 | 32.4 | 15.69% |
| N3 | 41.2 | 34.64% |
| N4 | 53.5 | 74.84% |
In the case of table 3 gives different ratio, the comprcssive strength of cement-based material, it is seen that nanoclay and fiber are made jointly
The comprcssive strength of cement mortar it is remarkably improved under with
C, rupture strength
Mortar specimen carries out using 3 curved loadings during bending test, obtains the cracking of test specimen in bending test by test
Load, ultimate load and mid-span deflection are shown in Table 4, and figure gives the distribution situation in the crack of test specimen bending rear surface.
Table 4 anti-folding result
| Test test specimen | Cracking amount of deflection/mm | Cracking load/MPa | Limiting flexibility/mm | Ultimate load/MPa |
| N1 | 0.23 | 255 | 5.2 | 765.3 |
| N2 | 0.27 | 286 | 6.4 | 801.2 |
| N3 | 0.38 | 347 | 29.8 | 915.7 |
| N4 | 0.46 | 465 | 31.2 | 1045.3 |
The incorporation of nanoclay can be obtained by data in table and improve the anti-bending strength of fibre mortar so that it is cracking amount of deflection and the limit are scratched
Degree increases, and cracking load and ultimate load increase the most accordingly, and therefore, nanoclay and fiber jointly act on down and significantly carrying
The high mechanical property of mortar.
Claims (4)
1. a nano clay modified fiber cement mortar, it is characterised in that: described cement mortar by gel rubber material, receive
Rice clay particles, PVA fiber, plasticiser, water reducer, quartz sand and water are made:
Wherein, gel rubber material by mass percentage by 60～70% flyash and surplus cement form；
Nanoclay particle is the 1% of Binder Materials weight；Plasticiser is the 0.1%～0.2% of Binder Materials weight；Diminishing
Agent is the 0.3～0.5% of Binder Materials weight, and quartz sand is the 30%～35% of Binder Materials weight；
Water-cement ratio is 0.25～0.35；The volume of PVA fiber is the 1%～2% of cement mortar cumulative volume.
Nano clay modified fiber cement mortar the most according to claim 1, it is characterised in that: described nanometer is glued
Grogs is nano kaoline particle, and its mean diameter is 300～500nm, and average platelet thickness is 20～50nm.
Nano clay modified fiber cement mortar the most according to claim 1, it is characterised in that: described PVA
A diameter of 40 μm of fiber, a length of 12mm, density is 13g/cm3。
4. the preparation method of cement mortar described in claim 1, it is characterised in that: first by nanoclay particle at water
Middle ultrasonic disperse 15 minutes, then be mixed and stirred for uniformly with water reducer, then by PVA fiber, cement, quartz sand,
Flyash, plasticiser stir 5 minutes in agitated kettle, finally by the mixed liquor of nanoclay particle Yu water reducer, fall
Enter and agitated kettle continues stirring 5 minutes.
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| CN105967574A (en) * | 2016-05-16 | 2016-09-28 | 句容联众科技开发有限公司 | Concrete for high-temperature kiln |
| CN109467352A (en) * | 2018-12-29 | 2019-03-15 | 海南华盛混凝土有限公司 | A kind of C70 high intensity self-compacting concrete formula and preparation method thereof |
| CN109608141B (en) * | 2019-01-23 | 2021-04-30 | 内蒙古工业大学 | Salt erosion resistant concrete and preparation method thereof |
| CN112456927A (en) * | 2020-11-16 | 2021-03-09 | 辽宁省交通高等专科学校 | Graphene oxide/polymer modified cement-based repair mortar and preparation method thereof |
| CN112456869A (en) * | 2020-11-16 | 2021-03-09 | 辽宁省交通高等专科学校 | High-fracture-resistance graphene oxide cement mortar and preparation method thereof |
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| US7799127B2 (en) * | 2006-02-09 | 2010-09-21 | The Regents Of The University Of Michigan | High early strength engineered cementitious composites |
| CN101723620A (en) * | 2008-10-11 | 2010-06-09 | 沂源县建设工程质量监督站 | Polyvinyl alcohol fiber reinforced cement-based material composition and preparation method and application thereof |
| CN101787672A (en) * | 2010-02-12 | 2010-07-28 | 大连理工大学 | Method for repairing concrete crack with multi-cracking cement-based composite |
| CN102601844A (en) * | 2012-03-08 | 2012-07-25 | 东南大学 | Producing method and construction method for non-expansion-joint pavement prefabricated member for cement racing track of bicycle |
| CN102603234B (en) * | 2012-03-14 | 2013-04-03 | 东南大学 | Method for pre-mixing high-ductility cement-based composite material |
| CN103130467B (en) * | 2013-03-28 | 2014-10-29 | 大连海事大学 | Modified cement and application thereof |
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