CN104496337A - 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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- CN104496337A CN104496337A CN201510014364.XA CN201510014364A CN104496337A CN 104496337 A CN104496337 A CN 104496337A CN 201510014364 A CN201510014364 A CN 201510014364A CN 104496337 A CN104496337 A CN 104496337A
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Abstract
The invention relates to nano-clay modified fiber cement mortar and a preparation method thereof and belongs to the field of concrete preparation. The nano-clay modified fiber cement mortar is prepared by a gel material, nano-clay particles, PVA fiber, a plasticizer, a water reducing agent, quartz sand and water, wherein the gel material consists of, by mass, pulverized fuel ash 60%-70% and the balance cement, the nano-clay particles accounts for 1% of the weight of the gel material, the plasticizer accounts for 0.1%-0.2% of the weight of the gel material, the water reducing agent accounts for 0.3%-0.5% of the weight of the gel material, the quartz sand accounts for 30%-35% of the weight of the gel material, the water-gel ratio ranges from 0.25 to 0.35, and the mixing amount of the PVA fiber accounts for 1%-2% of the total volume of the cement mortar. The nano-clay modified fiber cement mortar fully utilizes the unique effects of the nano-clay particles and the PVA fiber, and the chloride penetration resistance performance and mechanical property of a cement base body can be remarkably improved.
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 field.
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 also increases the frequency that the surging force of bridge member and stress exceed thereupon, increasing on the impact of component fatigue.This just makes bridge deck pavement be in extremely harsh using state, and 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, general identical with other concrete members, there are crack, abrasion, stripping, dew muscle, steel bar corrosion, serious also there will be cracked, come off, cave etc., how repairing and reinforcement is carried out to damage bridge structure, extend the work-ing life of bridge structure, become the focal issue paid close attention to both at home and abroad.
Summary of the invention
In view of the above problems, the present invention have developed a kind of nano clay modified fiber cement mortar in order to solve the rear maintenance and reinforcement of girder construction damage, the anti-villaumite perviousness superior due to it and high tenacity, effectively can resist the erosion of harmful environmental material and the continuous action of vehicular load, thus effectively can improve security and the usability of bridge structure, extend the work-ing life of bridge structure.
A kind of nano clay modified fiber cement mortar, described sand-cement slurry is made up of gelatinous material, nanoclay particle, PVA fiber, fluidizer, water reducer, quartz sand and water:
Wherein, gelatinous material is made up of 60 ~ 70% flyash and surplus cement by mass percentage;
Nanoclay particle is 1% of gelling material weight; Fluidizer is 0.1% ~ 0.2% of gelling material weight; Water reducer is 0.3 ~ 0.5% of gelling material weight, and quartz sand is 30% ~ 35% of gelling material weight;
Water-cement ratio is 0.25 ~ 0.35; The volume of PVA fiber is 1% ~ 2% of sand-cement slurry cumulative volume.
Nanoclay particle of the present invention is nano kaoline particle, and its median size is 300 ~ 500nm, and average platelet thickness is 20 ~ 50nm.Because its particle 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 the pore structure of cement mortar matrix, add the density of matrix, thus it is inner effectively can to resist harmful environmental material intrusion concrete structure.
PVA fibre tensile strength of the present invention is high, Young's modulus is high; When nanoclay and PVA fiber add in cement matrix with suitable proportion, both can well play respective unique advantage in hardening of cement process, improve anti-villaumite perviousness and the non-deformability of cement matrix.The diameter of the preferred described PVA fiber of the present invention is 40 μm, and length is 12mm, and density is 13g/cm
3.
Water-cement ratio of the present invention refers to the weight ratio of water and gelatinous material.
Flyash described in all technical schemes of the present invention is for being preferably I grade of flyash, and particle diameter is 1.1 ~ 1.8 μm.
The water reducer 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, is preferably polycarboxylate analog high efficiency water reducing agent.
Described in all technical schemes of the present invention, fluidizer is Vltra tears.
Sand-cement slurry of the present invention is preferably prepared as follows: first by nanoclay particle ultrasonic disperse 15 minutes in water, mix with water reducer again and stir, then PVA fiber, cement, quartz sand, flyash, fluidizer are stirred 5 minutes in agitator kettle, finally by the mixed solution of nanoclay particle and water reducer, pour in agitator kettle and continue stirring 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 the particular utility of nanoclay particles and PVA fiber, the Anti-Chloride Ion Penetration of cement matrix can be significantly improved, impervious raising 20% ~ 30%; Mechanical property improves 25% ~ 35%, and its sag can reach 20mm ~ 30mm, and the effect of adaptation bridge structure cyclic reverse loading that can be good, can significantly improve structure repair consolidation effect, the work-ing life of extending structure,
Accompanying drawing explanation
Accompanying drawing 2 width of the present invention,
The microscopic appearance photo that Fig. 1 (a) is nanoclay;
The microscopic appearance photo that Fig. 1 (b) is flyash.
Embodiment
Following non-limiting example can make the present invention of those of ordinary skill in the art's comprehend, but does not limit the present invention in any way.
Embodiment 1
(1) the present invention's nanoclay used is nano kaoline (Hebei), and average particulate diameter is 300 ~ 500nm, and average platelet thickness is the microtexture that 20 ~ 50nm, Fig. 1 (a) give nanoclay; Flyash is I grade of flyash (Dalian), and its grain diameter is 1.1 ~ 1.8 μm, and Fig. 1 (b) gives the microscopic appearance of flyash; Water reducer used is polycarboxylate analog high efficiency water reducing agent (Dalian); Cement (the PO42.5R ordinary Portland cement in little Ye field, Dalian); Sand is quartz sand, and grain diameter is 110 μm ~ 220 μm; Fluidizer used is Vltra tears (HPMC) (Tai'an).
(2) nano clay modified fiber cement mortar test specimen proportioning is tested
Select water-cement ratio to be w/b=0.34 in this test, flyash accounts for 66.6% of gelling material, and fibers content is 2% of mixture cumulative volume, water reducer volume is 0.4% of gelling material, fluidizer volume is 0.2% of gelling material, and nanoclay volume is 1%, and concrete proportioning is in table 1.
Table 1 concrete mix (kg/m
3)
| Test specimen is numbered | Quartz sand | Cement | Flyash | Water | Water reducer | Fluidizer | 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 |
Take various types of materials mixing mortar specimen according to above-mentioned proportioning, chloride permeability sample dimensions is Φ 100mm × 100mm right cylinder, and anti-folding sample dimensions is length × wide × height=l × b × h=400 × 100 × 15mm, and test specimen calculates across footpath l
0=300mm, the sample dimensions of cubic compressive strength test is 70.7 × 70.7 × 70.7mm, maintenance in the standard curing room (temperature is 20 ± 1 DEG C, relative humidity>=95%) after test material preparation completes, form removal after 1 day, then continue maintenance to 28 and test day length of time.
(3) experimental installation
Chloride permeability test adopts the RCM-DAL type chloride diffusion coefficient determinator of Beijing Nai Er Company; Compressive strength test adopts YAW-YAW2000A type 200t microcomputer controlled electro-hydraulic servo pressure testing machine, and loading velocity is 0.6MPa/s; Bending test adopts 30t closed loop hydraulic servo material-testing machine, and loading velocity is 0.15mm/min.
(4) test-results
When mortar specimen maintenance tested the length of time by 28 days, taking-up chloride permeability test specimen and resistance to compression, anti-folding test specimen carry out chloride permeability test and mechanical property test, evaluate mortar resistance of chloride ion penetration and mechanical property by mensuration chloride diffusion coefficient, ultimate compression strength, bending resistance load, sag, concrete test-results is as follows.
A, chloride permeability are tested
Table 2 chloride diffusion coefficient
| Test test specimen | Chloride diffusion coefficient/m 2/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, can obtain thus, and nanoclay and fiber acting in conjunction significantly can improve the penetrating quality of sand-cement slurry, improve the Anti-Chloride Ion Penetration of mortar.
B, compressive strength test
Table 3 ultimate compression strength
| Test test specimen | Ultimate compression strength/MPa | Increased percentage/% |
| N1 | 28.6 | |
| N2 | 32.4 | 15.69％ |
| N3 | 41.2 | 34.64％ |
| N4 | 53.5 | 74.84％ |
Under table 3 gives different ratio situation, the ultimate compression strength of cement-based material, can significantly improve the ultimate compression strength of sand-cement slurry under visible nanoclay and fiber acting in conjunction
C, folding strength
Mortar specimen adopts 3 curved loadings when carrying out bending test, obtain the cracking load of test specimen in bending test, ultimate load and mid-span deflection in table 4 by test, figure gives the distribution situation that test specimen bends the crack of rear surface.
The anti-folding result of table 4
| 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 |
What can obtain nanoclay by data in table mixes the anti-bending strength improving fibre mortar, make its ftracture amount of deflection and limiting flexibility increase, cracking load and ultimate load be corresponding increase also, therefore, significantly improves the mechanical property of mortar under nanoclay and fiber acting in conjunction.
Claims (4)
1. a nano clay modified fiber cement mortar, is characterized in that: described sand-cement slurry is made up of gelatinous material, nanoclay particle, PVA fiber, fluidizer, water reducer, quartz sand and water:
Wherein, gelatinous material is made up of 60 ~ 70% flyash and surplus cement by mass percentage;
Nanoclay particle is 1% of gelling material weight; Fluidizer is 0.1% ~ 0.2% of gelling material weight; Water reducer is 0.3 ~ 0.5% of gelling material weight, and quartz sand is 30% ~ 35% of gelling material weight;
Water-cement ratio is 0.25 ~ 0.35; The volume of PVA fiber is 1% ~ 2% of sand-cement slurry cumulative volume.
2. nano clay modified fiber cement mortar according to claim 1, is characterized in that: described nanoclay particle is nano kaoline particle, and its median size is 300 ~ 500nm, and average platelet thickness is 20 ~ 50nm.
3. nano clay modified fiber cement mortar according to claim 1, is characterized in that: the diameter of described PVA fiber is 40 μm, and length is 12mm, and density is 13g/cm
3.
4. the preparation method of sand-cement slurry described in claim 1, it is characterized in that: first by nanoclay particle ultrasonic disperse 15 minutes in water, mix with water reducer again and stir, then PVA fiber, cement, quartz sand, flyash, fluidizer are stirred 5 minutes in agitator kettle, finally by the mixed solution of nanoclay particle and water reducer, pour in agitator kettle and continue stirring 5 minutes.
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Cited By (5)
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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 |
| CN109608141A (en) * | 2019-01-23 | 2019-04-12 | 内蒙古工业大学 | A kind of salt resistance corrosion concrete 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 |
| 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 |
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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 |
| CN109608141A (en) * | 2019-01-23 | 2019-04-12 | 内蒙古工业大学 | A kind of salt resistance corrosion concrete 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 |
| 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 |
| 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 |
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