CN109809778A - Ultra-early strength modified PVA fiber reinforced sea sand cement-based composite material and preparation method thereof - Google Patents
Ultra-early strength modified PVA fiber reinforced sea sand cement-based composite material and preparation method thereof Download PDFInfo
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Abstract
本发明公开了一种超早强改性PVA纤维增强海砂水泥基复合材料及其制备方法，该材料按重量份包括以下组分：硫铝酸盐水泥450～650份、海水190～300份、海砂440～630份、磨细矿渣85～150份、粉煤灰50～65份、PVA纤维5～11份、碳纤维2～5份、高效减水剂2～5份、早强剂0～2份。本发明提出利用海砂及海水等岛礁上已有材料，与水泥、矿渣、粉煤灰、纤维、减水剂、早强剂组合，配置成快硬水泥，满足7h内达到40Mpa以上的抗压强度要求，实现快速建造海上工程。掺入改性PVA纤维和碳纤维来提高复合材料的韧性，同时增强基体的抗拉、抗压和抗折强度。采用有机无机复合早强剂来提高材料的早期强度，减小掺入粉煤灰带来的不利影响。The invention discloses an ultra-early strength modified PVA fiber-reinforced sea sand cement-based composite material and a preparation method thereof. The material comprises the following components by weight: 450-650 parts of sulfoaluminate cement and 190-300 parts of sea water , 440-630 parts of sea sand, 85-150 parts of ground slag, 50-65 parts of fly ash, 5-11 parts of PVA fiber, 2-5 parts of carbon fiber, 2-5 parts of superplasticizer, 0 of early strength agent ~ 2 servings. The invention proposes to use the existing materials on islands and reefs such as sea sand and seawater, and combine them with cement, slag, fly ash, fiber, water reducing agent and early strength agent to configure fast-hardening cement, which can meet the requirements of resistance to more than 40Mpa within 7 hours. compressive strength requirements to achieve rapid construction of offshore projects. Modified PVA fibers and carbon fibers are incorporated to improve the toughness of the composite, while enhancing the tensile, compressive and flexural strength of the matrix. The organic-inorganic composite early strength agent is used to improve the early strength of the material and reduce the adverse effects caused by the addition of fly ash.
Description
Technical field
The present invention relates to the field of building materials, in particular to a kind of super hardening modified PVA fiber reinforcement sea sand cement base are multiple
Condensation material and preparation method thereof.
Background technique
Marine Ji Dao lacks sand, stone and freshwater resources far from the mainland, if off-shore structure is using normal concrete material
Expect that just needing to expend a large amount of manpower and material resources carries out transport of materials, and the required maintenance patching material after building is impaired
It can not obtain at once.Seawater sea sand resources are directly utilized, then transport of materials amount can be greatly lowered, speed is built in raising, is saved
Cost.But the villaumite and shell confent in sea sand are to limit its two big main cause used in concrete.Chlorine in sea sand
Salt will affect the hydration process of portland cement, especially have corrosiveness to the reinforcing bar in concrete, and shell may then influence
Workability, intensity and durability of concrete etc..Due to it is unreasonable use or abuse sea sand, early stage Japan, Britain, China and in
There is serious concrete quality and corrosion of reinforcing steel bar in the countries and regions such as state Taiwan, especially in the sudden lotus such as earthquake
Under load effect, marine sand concrete structure may seem more fragile.Numerous failures experience have shown that, abuse or abuse sea sand presence
Very big risk, but after science understands the characteristic of sea sand and marine sand concrete, sea sand can be by reasonable resource utilization.
Utilization of the China for sea sand at present needs to handle the step by sea sand desalting mostly.And sea sand at this stage
The method of processing mainly has fresh water douche, river sand to be used in mixed way method and natural placement methods.The construction of these processing methods is more multiple
It is miscellaneous, it brings construction cost to increase or expend time growth, is not suitable for large-scale use in engineering.Existing marine sand concrete is compared
It can be also slightly decreased in river sand concrete working performance, compression strength, tensile strength decrease, and brittleness is larger.Part
Improved by fibre-reinforced marine sand concrete toughness, but its early strength lose again it is larger, therefore can not be simultaneously
Reach high tenacity and morning is strong.Under existing Research foundation, a kind of construction method simple possible need to be proposed, basis material has centainly
Toughness, while being able to satisfy early strong requirement, should also have the advanced composite material (ACM) of certain economy, meet engineering demand.
Summary of the invention
It is a primary object of the present invention to make full use of marine resources, the material applications such as seawater, sea sand are poured to concrete
In building, a kind of super hardening modified PVA fiber reinforcement sea sand cement-base composite material and preparation method thereof is proposed.Such novel-section
Material can satisfy the engineering demand of marine building, and greatly alleviate resource pressure, save building cost.
To achieve the purpose of the present invention, super hardening modified PVA fiber reinforcement sea sand cement base composite wood provided by the invention
Material, it is characterised in that: in terms of mass parts, including following components: 450~650 parts of sulphate aluminium cement, 190~300 parts of seawater,
440~630 parts of sea sand, 85~150 parts of ground slag, 50~65 parts of flyash, 5~11 parts of PVA fiber, 2~5 parts of carbon fiber,
2~5 parts of high efficiency water reducing agent, 0~2 part of early strength agent.
Preferably, in terms of mass parts, including following components: 500 parts of sulphate aluminium cement, 217 parts of seawater, sea sand
620 parts, it is 120 parts of ground slag, 80 parts of flyash, 10.5 parts of PVA fiber, 4.5 parts of carbon fiber, 2.5 parts of high efficiency water reducing agent, early strong
1.2 parts of agent.
Further, the early strength agent uses organic early strength agent and inorganic early strength agent to be combined into mass ratio for 1:16 ratio
Complex accelerator, organic early strength agent use ammonia alcohols, and inorganic early strength agent uses chloride-based；After being surface-treated with amido silicon oil
PVA fiber and carbon fiber be used in mixed way, the PVA fibre length be 8-8.5mm.
The present invention also provides a kind of preparation method of super hardening modified PVA fiber reinforcement sea sand cement-base composite material,
Be characterized in that: it is comprised the following steps:
(1) cement, sea sand, ground blast furnace slag, flyash are sufficiently mixed and are stirred 3~5 minutes, obtain the first mixture；
The miberal powder is granulated blast-furnace miberal powder micro mist, and product hierarchy is S95 grades；The flyash is aluminous fly-ash, alumina content
Greater than 37%；
(2) by water-reducing agent, complex accelerator, be added to the water, stirred evenly after being sufficiently mixed, obtain the second mixture；
(3) the second mixture obtained in step (2) is added in the first mixture obtained in step (1), sufficiently
It is stirred 3~5 minutes after mixing, obtains third mixture；
(4) amido silicon oil that 0~1.5 part is extracted with syringe, is uniformly sprayed on PVA fiber, further makes ammonia by hand
Base silicone oil dispersion is more uniform, to reduce the cohesive force between fiber-interface, and the cohesive strength for reducing matrix itself；The PVA
Fibre length is 8-8.5mm；
(5) treated PVA fiber and carbon fiber, high-speed stirred 3 is added into third mixture obtained in step (3)
Minute, obtain super hardening modified PVA fiber reinforced cement-based composite material；The composite material is in terms of mass parts, component are as follows: sulphur
450~650 parts of aluminate cement, 190~300 parts of seawater, 440~630 parts of sea sand, 85~150 parts of ground slag, flyash 50
~65 parts, 5~11 parts of PVA fiber, 2~5 parts of carbon fiber, 2~5 parts of high efficiency water reducing agent, 0~2 part of early strength agent.
The present invention has the advantages that super hardening modified PVA fiber reinforcement sea sand cement-base composite material of the present invention, passes through tune
Whole match ratio obtains the superior concrete material of performance.Make concrete hole by the dosage and incorporation miberal powder that change cementitious material
Structure is more closely knit, improves the intensity of concrete, alleviate sea sand directly using causing concrete strength to reduce the problem of.
PVA fiber and carbon fiber hybrid use, and using elasticity modulus height, limit elongation is big, the PVA fiber of good dispersion
Improve cement-based material toughness, further increases matrix toughness using carbon fiber, while improving resistance to compression and the flexural strength of matrix.
PVA fiber is pre-processed with amido silicon oil simultaneously, damage -form is all broken from PVA fiber to be become partially breaking part
It extracts, plays the effect of fiber to the greatest extent, improve the toughness of structure.And mix coal ash instead part of cement, flyash
Have the function of improving assorted fibre and substrate interface, is given full play to so that the activeness and quietness effect of assorted fibre is available.
But since the hydration rate of flyash is slow compared with cement, therefore the early strength of cement-based material can decrease after adding coal ash.
Therefore the better early strength agent of using effect is needed.
Using the compound method of organic-inorganic early strength agent, organic early strength agent uses ammonia alcohols, and inorganic early strength agent uses chlorination
Species, in mass ratio 1:16 ratio are compound.Ammonia alcohols early strength agent is adsorbed in cement particle surface, lowers solution surface tension, promotees
Into the hydrolysis of cement granules.Chloride-based early strength agent accelerates hydrated cementitious by hydrolysis.Two kinds of mechanism of action different morning
Strong agent is used in combination, to obtain better working performance, increases substantially the early strength of matrix.By above-mentioned processing, originally
Invention obtains one kind and takes into account high tenacity and early by force, be provided simultaneously with the cement-base composite material of certain economy.
The present invention uses sulphate aluminium cement, has certain advantage on early strength of concrete.Sea sand, seawater it is straight
Use is connect, construction is greatly facilitated and saves construction cost, and is straight to eliminate sea sand by adjusting the ratio of mud and incorporation miberal powder
Connect use influence caused by intensity.Using sulphate aluminium cement, cooperate the use of complex accelerator, passes through different effect machines
Various getting up early intensity for promoting concrete material are managed, meet the needs of quickly building.Coagulation is configured using seawater, sea sand
Soil, realization are gathered materials on the spot, the saving construction cost of high degree, reduce difficulty of construction.And by the adjustment to component, make sea
Sand can directly be used without desalt processing, also have that clay content is low, fineness modulus is uniform, pellet hardness is good compared to river sand
The advantages that, and its working performance is not influenced.
It is saving construction cost, there is very big advantage on the time.Compared with normal concrete, coarse aggregate is free of, is had
The characteristics of lightweight.The mineral admixtures such as ground slag, flyash are added in concrete simultaneously, concrete can be significantly improved
Structure increases compactness, and reduces the early-age shrinkage of super high-early concrete and creep, a degree of shellfish alleviated in sea sand
Shell is influenced caused by intensity.In the case where PVA fiber and carbon fiber work together, reduce the drying shrinkage deformation of concrete, enhances
The toughness of structure improves the cracking resistance of component, reduces the width of component.And finish processing is carried out to PVA, with amino silicone oil immersion
Profit, the cohesive strength that can reduce the cohesive force between fiber-interface, and reduce matrix itself make fiber play better effect.
By this material application in quickly building marine engineering, it is not only able to satisfy its engineering demand, moreover it is possible to greatly reduction construction cost.
Specific embodiment
The present invention is described in further details below with reference to embodiment:
Embodiment one:
1) 450 parts of sulphate aluminium cements, 440 parts of sea sands, 85 parts of ground slags, 50 parts of flyash are mixed and stirred for 3~5
Minute, obtain the first mixture；
2) 2 parts of high efficiency water reducing agents, 1 part of early strength agent are added in 190 parts of mix seawater, mix is uniform, and it is mixed to obtain second
Close object；
3) the second mixture obtained in step 2 is added in the first mixture obtained in step 1, after being sufficiently mixed
Stirring 3~5 minutes, obtains third mixture；
4) 0.5 part of amido silicon oil is extracted with syringe, be uniformly sprayed on 5 parts of PVA fibers, further make amino silicone by hand
Oil dispersed is more uniform；
5) 5 parts of treated PVA fiber and 2 parts of carbon fibers, high-speed stirrings are added into third mixture obtained in step 3
It mixes 3 minutes, obtains a kind of super hardening modified PVA fiber reinforcement sea sand cement-base composite material.
By a process for preparing super hardening modified PVA fiber reinforcement sea sand cement-base composite material, according to country mark
Quasi- " standard for test methods of mechanical properties of ordinary concrete " (GB/T 50081-2016) to the cubic compressive strength of concrete into
Row is tested, and it is 45.46MPa, tensile splitting strength 24.36MPa that compression strength is measured after 7h.Meet Practical Project demand.
Embodiment two:
1) 500 parts of sulphate aluminium cements, 620 parts of sea sands, 120 parts of ground slags, 80 parts of flyash are mixed and stirred for 3~
5 minutes, obtain the first mixture；
2) 2.5 parts of high efficiency water reducing agents, 1.2 parts of complex accelerators are added in 217 parts of mix seawater, mix is uniform, obtains
To the second mixture；
3) the second mixture obtained in step 2 is added in the first mixture obtained in step 1, after being sufficiently mixed
Stirring 3~5 minutes, obtains third mixture；
4) 1 part of amido silicon oil is extracted with syringe, be uniformly sprayed on 10.5 parts of PVA fibers, further make amino by hand
Silicone oil dispersion is more uniform；
5) 10.5 parts of treated PVA fiber and 4.5 parts of carbon fibers are added into third mixture obtained in step 3,
High-speed stirred 3 minutes, obtain a kind of super hardening modified PVA fiber reinforcement sea sand cement-base composite material.
By a process for preparing super hardening modified PVA fiber reinforcement sea sand cement-base composite material, according to country mark
Quasi- " standard for test methods of mechanical properties of ordinary concrete " (GB/T 50081-2016) to the cubic compressive strength of concrete into
Row is tested, and it is 43.23MPa, tensile splitting strength 24.80MPa that compression strength is measured after 7h.Meet Practical Project demand.
Embodiment three:
1) 650 parts of sulphate aluminium cements, 630 parts of sea sands, 150 parts of ground slags, 65 parts of flyash are mixed and stirred for 3~
5 minutes, obtain the first mixture；
2) 5 parts of high efficiency water reducing agents, 2 parts of early strength agent are added in 300 parts of mix seawater, mix is uniform, and it is mixed to obtain second
Close object；
3) the second mixture obtained in step 2 is added in the first mixture obtained in step 1, after being sufficiently mixed
Stirring 3~5 minutes, obtains third mixture；
4) 1.1 parts of amido silicon oils are extracted with syringe, be uniformly sprayed on 11 parts of PVA fibers, further make amino by hand
Silicone oil dispersion is more uniform；
5) 11 parts of treated PVA fiber and 5 parts of carbon fibers, high speed are added into third mixture obtained in step 3
Stirring 3 minutes, obtains a kind of super hardening modified PVA fiber reinforcement sea sand cement-base composite material.
By a process for preparing super hardening modified PVA fiber reinforcement sea sand cement-base composite material, according to country mark
Quasi- " standard for test methods of mechanical properties of ordinary concrete " (GB/T 50081-2016) to the cubic compressive strength of concrete into
Row is tested, and it is 48.26MPa, tensile splitting strength 30.2MPa that compression strength is measured after 7h.Meet Practical Project demand.
Example IV:
1) 450 parts of sulphate aluminium cements, 448 parts of sea sands, 85 parts of ground slags, 50 parts of flyash are mixed and stirred for 3~5
Minute, obtain the first mixture；
2) 2.1 parts of high efficiency water reducing agents, 1 part of early strength agent are added in 196 parts of mix seawater, mix is uniform, obtains second
Mixture；
3) the second mixture obtained in step 2 is added in the first mixture obtained in step 1, after being sufficiently mixed
Stirring 3~5 minutes, obtains third mixture；
4) 0.5 part of amido silicon oil is extracted with syringe, be uniformly sprayed on 5.5 parts of PVA fibers, further make amino by hand
Silicone oil dispersion is more uniform；
5) 5.5 parts of treated PVA fiber and 2 parts of carbon fibers, high speed are added into third mixture obtained in step 3
Stirring 3 minutes, obtains super hardening modified PVA fiber reinforcement sea sand cement-base composite material.
By a process for preparing a kind of super hardening modified PVA fiber reinforcement sea sand cement-base composite material, according to state
Cube pressure resistance of the family's standard " standard for test methods of mechanical properties of ordinary concrete " (GB/T 50081-2016) to concrete
Degree is tested, and it is 45.46MPa, tensile splitting strength 24.36MPa that compression strength is measured after 7h.Meet Practical Project demand.
Embodiment five:
1) 550 parts of sulphate aluminium cements, 561 parts of sea sands, 116.6 parts of miberal powders, 58 parts of flyash are mixed and stirred for 3~5
Minute, obtain the first mixture；
2) 2.5 parts of high efficiency water reducing agents, 1.1 parts of complex accelerators are added in 218 parts of mix seawater, mix is uniform, obtains
To the second mixture；
3) the second mixture obtained in step 2 is added in the first mixture obtained in step 1, after being sufficiently mixed
Stirring 3~5 minutes, obtains third mixture；
4) 0.5 part of amido silicon oil is extracted with syringe, be uniformly sprayed on 5.2 parts of PVA fibers, further make amino by hand
Silicone oil dispersion is more uniform；
5) 5.2 parts of treated PVA fiber and 2.2 parts of carbon fibers are added into third mixture obtained in step 3, it is high
Speed stirring 3 minutes, obtains super hardening modified PVA fiber reinforcement sea sand cement-base composite material.
By a process for preparing a kind of super hardening modified PVA fiber reinforcement sea sand cement-base composite material, according to state
Cube pressure resistance of the family's standard " standard for test methods of mechanical properties of ordinary concrete " (GB/T 50081-2016) to concrete
Degree is tested, and it is 43.23MPa, tensile splitting strength 24.80MPa that compression strength is measured after 7h.Meet Practical Project demand.
Embodiment six:
1) 650 parts of sulphate aluminium cements, 625 parts of sea sands, 144 parts of miberal powders, 62 parts of flyash are mixed and stirred for 3~5 points
Clock obtains the first mixture；
2) 3.5 parts of high efficiency water reducing agents, 1.6 parts of early strength agent are added in 300 parts of mix seawater, mix is uniform, obtains
Two mixtures；
3) the second mixture obtained in step 2 is added in the first mixture obtained in step 1, after being sufficiently mixed
Stirring 3~5 minutes, obtains third mixture；
4) 1 part of amido silicon oil is extracted with syringe, be uniformly sprayed on 10.3 parts of PVA fibers, further make amino by hand
Silicone oil dispersion is more uniform；
5) 10.3 parts of treated PVA fiber and 4.2 parts of carbon fibers are added into third mixture obtained in step 3,
High-speed stirred 3 minutes, obtain super hardening modified PVA fiber reinforcement sea sand cement-base composite material.
By a process for preparing a kind of super hardening modified PVA fiber reinforcement sea sand cement-base composite material, according to state
Cube pressure resistance of the family's standard " standard for test methods of mechanical properties of ordinary concrete " (GB/T 50081-2016) to concrete
Degree is tested, and it is 48.26MPa, tensile splitting strength 30.2MPa that compression strength is measured after 7h.Meet Practical Project demand.
Claims (4)
1. a kind of super hardening modified PVA fiber reinforcement sea sand cement-base composite material, it is characterised in that: in terms of mass parts, including
Following components: 450~650 parts of sulphate aluminium cement, 190~300 parts of seawater, 440~630 parts of sea sand, ground slag 85~150
Part, 50~65 parts of flyash, 5~11 parts of PVA fiber, 2~5 parts of carbon fiber, 2~5 parts of high efficiency water reducing agent, 0~2 part of early strength agent.
2. super hardening modified PVA fiber reinforcement sea sand cement-base composite material according to claim 1, it is characterised in that:
In terms of mass parts, including following components: 500 parts of sulphate aluminium cement, 217 parts of seawater, 620 parts of sea sand, 120 parts of ground slag,
80 parts of flyash, 10.5 parts of PVA fiber, 4.5 parts of carbon fiber, 2.5 parts of high efficiency water reducing agent, 1.2 parts of early strength agent.
3. super hardening modified PVA fiber reinforcement sea sand cement-base composite material according to claim 1 or 2, feature exist
In: the early strength agent uses organic early strength agent and inorganic early strength agent to be combined into complex accelerator in mass ratio for 1:16 ratio, has
Machine early strength agent uses ammonia alcohols, and inorganic early strength agent uses chloride-based；PVA fiber and carbon after being surface-treated with amido silicon oil
Fiber is used in mixed way, and the PVA fibre length is 8-8.5mm.
4. a kind of method for preparing super hardening modified PVA fiber reinforcement sea sand cement-base composite material as claimed in claim 3,
Be characterized in that: it is comprised the following steps:
(1) cement, sea sand, ground blast furnace slag, flyash are sufficiently mixed and are stirred 3~5 minutes, obtain the first mixture；It is described
Miberal powder is granulated blast-furnace miberal powder micro mist, and product hierarchy is S95 grades；The flyash is aluminous fly-ash, and alumina content is greater than
37%；
(2) by water-reducing agent, complex accelerator, be added to the water, stirred evenly after being sufficiently mixed, obtain the second mixture；
(3) the second mixture obtained in step (2) is added in the first mixture obtained in step (1), is sufficiently mixed
It stirs 3~5 minutes afterwards, obtains third mixture；
(4) amido silicon oil that 0~1.5 part is extracted with syringe, is uniformly sprayed on PVA fiber, further makes amino silicone by hand
Oil dispersed is more uniform, to reduce the cohesive force between fiber-interface, and the cohesive strength for reducing matrix itself；The PVA fiber
Length is 8-8.5mm；
(5) treated PVA fiber and carbon fiber is added into third mixture obtained in step (3), high-speed stirred 3 is divided
Clock obtains super hardening modified PVA fiber reinforced cement-based composite material；The composite material is in terms of mass parts, component are as follows: sulphur aluminium
450~650 parts of acid salt cement, 190~300 parts of seawater, 440~630 parts of sea sand, 85~150 parts of ground slag, flyash 50~
65 parts, 5~11 parts of PVA fiber, 2~5 parts of carbon fiber, 2~5 parts of high efficiency water reducing agent, 0~2 part of early strength agent.
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| CN110498656A (en) * | 2019-08-29 | 2019-11-26 | 武汉大学 | Seawater sea sand cement-based composite material solidified with chloride ions and preparation method thereof |
| CN111056790A (en) * | 2019-12-13 | 2020-04-24 | 东北林业大学 | High-performance concrete doped with micro-nano-grade fibers and preparation method thereof |
| CN111056790B (en) * | 2019-12-13 | 2022-03-29 | 东北林业大学 | High-performance concrete doped with micro-nano-grade fibers and preparation method thereof |
| CN114775285A (en) * | 2022-03-17 | 2022-07-22 | 中交四航工程研究院有限公司 | PVA fiber dispersion treatment method for preparing ECC concrete |
| CN115286324A (en) * | 2022-09-01 | 2022-11-04 | 中国人民解放军陆军勤务学院 | Hybrid fiber marine aggregate concrete and preparation method thereof |
| CN116143465A (en) * | 2022-11-17 | 2023-05-23 | 厦门安能建设有限公司 | A self-compacting high-strength and high-toughness cement-based concrete repair material and preparation method thereof |
| CN115893961A (en) * | 2022-11-28 | 2023-04-04 | 湖北商贸学院 | Preparation method of inorganic non-metal plate for ocean trade container |
| CN115893961B (en) * | 2022-11-28 | 2024-05-24 | 湖北商贸学院 | Preparation method of inorganic nonmetallic plate for ocean trade container |
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