CN108545975A - A kind of modified SILICA FUME of gunite concrete - Google Patents

A kind of modified SILICA FUME of gunite concrete Download PDF

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Publication number
CN108545975A
CN108545975A CN201810391061.3A CN201810391061A CN108545975A CN 108545975 A CN108545975 A CN 108545975A CN 201810391061 A CN201810391061 A CN 201810391061A CN 108545975 A CN108545975 A CN 108545975A
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China
Prior art keywords
parts
silica fume
concrete
water
gunite concrete
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Pending
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CN201810391061.3A
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Chinese (zh)
Inventor
梁勇
刘自力
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Chengdu Dong Lan-Star New Material Co Ltd
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Chengdu Dong Lan-Star New Material Co Ltd
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Priority to CN201810391061.3A priority Critical patent/CN108545975A/en
Publication of CN108545975A publication Critical patent/CN108545975A/en
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04Waste materials; Refuse
    • C04B18/14Waste materials; Refuse from metallurgical processes
    • C04B18/146Silica fume
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02Treatment
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039Premixtures of ingredients
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20Resistance against chemical, physical or biological attack
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20Resistance against chemical, physical or biological attack
    • C04B2111/27Water resistance, i.e. waterproof or water-repellent materials
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Abstract

The invention discloses a kind of modified SILICA FUMEs of gunite concrete, belong to gunite concrete cementitious material field, count by weight ratio, which is made of following components:100 parts of SILICA FUME;15 parts of metakaolin;0.5 1 parts of water-reducing agent;13 parts of alkali-activator;0.5 1 parts of sodium hydroxide;0.5 1 parts of sugar calcium retarder;0.1 0.3 parts of triethanolamine;0.5 1 parts of polyacrylamide;0.5 1 parts of cellulose ether;The present invention can significantly improve the workability of concrete, stick poly- property and anti-bleeding, reduce rebound of shotcrete rate and cracking risk, the intensity for improving concrete hardening object early stage and later stage, improves concrete hole gap structure, improves gunite concrete anti-permeability performance and durability.

Description

A kind of modified SILICA FUME of gunite concrete
Technical field
The invention belongs to gunite concrete cementitious material fields, and in particular to a kind of modified micro- silicon of gunite concrete Powder.
Background technology
Gunite concrete refers to utilizing compressed air or other power, by cement, sand, stone, accelerator, additive and water etc. What raw material were worked good by a certain percentage mixes and stirs material, by pipeline, and be ejected at a high speed by spray plane condensation hardening and At a kind of concrete.In the liner supporting Structural Engineering of some large area, concrete spraying support and traditional supporting shape Formula, which is compared, unrivaled superiority.But that there are rebound degrees is high for gunite concrete, dust is big, low strength, easy to crack, anti- It oozes and the problems such as durability is poor, causes construction environment severe, surrouding rock deformation is big, and design service life is not achieved in support engineering, easily There is a series of problems, such as water seepage of tunnel.
Invention content
That there are rebound degrees it is an object of the invention to being directed to above-mentioned gunite concrete is high, dust is big, low strength, Yi Kai It splits, impervious and poor durability problem, the present invention provides a kind of gunite concrete modified SILICA FUME.
The technical solution adopted by the present invention is as follows:
A kind of modified SILICA FUME of gunite concrete, is counted, which is made of following components by weight ratio:
This programme has the beneficial effect that:The workability of concrete can be significantly improved, stick poly- property and anti-bleeding, reduced Rebound of shotcrete rate and cracking risk improve the intensity in concrete hardening object early stage and later stage, improve concrete pore knot Structure improves gunite concrete anti-permeability performance and durability.
SILICA FUME contains a large amount of SiO2, a large amount of SiO is contained in metakaolin2And Al2O3, provided instead for hydration reaction Answer object;Water-reducing agent prepares the usage amount of moisture during concrete for reduction, reduces SILICA FUME and metakaolin in water To the demand of water when dissolving;Alkali-activator is used as catalyst, promotes SiO2And Al2O3Hydration reaction occurs, it is early to improve concrete Phase and later strength;Sodium hydroxide is dissolved in the water so that entire concrete is in alkaline environment, enhances the catalytic of alkali-activator Energy;Sugar calcium retarder is used to delay the hydration reaction of cement, extends the setting time of concrete;Triethanolamine is as a kind of cement Early strength agent has catalytic action to the hydration reaction of cement so that the aquation of C3A accelerates, and accelerates the shape of entringite and C-S-H gels At consuming a large amount of mixing water, accelerate the formation of Behavior of Hardened Cement Paste and rapidly change to cubic, simultaneously because soluble complexing The formation of object reduces the concentration of Ca2+ and Al3+ in cement mortar, to promote the reaction of other cement minerals;Polyacrylamide Amine and hydroxypropyl methyl cellulose ether can significantly improve concrete mix consistency, increase and stick poly- property, reduce rebound, improve coagulation The adhesive property of native mixture and country rock improves stability and the safety of support engineering.
Preferably, specific surface area >=18000m of the SILICA FUME2/ kg, average grain diameter≤300nm, water demand ratio≤ 115%, 28d activity index >=120%.
The SILICA FUME of this specification, it is soluble easily in water, and can be by active component SiO therein2It releases, increases SiO2 The specific surface area of grain so that catalysis reaction can be carried out thoroughly, for enhancing concrete early stage and later strength.
Preferably, the metakaolin is ultra-fine metakaolin, and table is compared in average particle size≤2.1 μm of ultra-fine metakaolin Area >=600m2/ kg, 28d activity index >=110%.
Ultra-fine metakaolin is soluble easily in water, can be by SiO therein2And Al2O3It fully releases, and big ratio table Area can accelerate the speed of hydration reaction.
Preferably, the water-reducing agent is polycarboxylate water-reducer powder, water-reducing rate >=30%.
Polycarboxylate water-reducer is soluble easily in water, and concrete slump loss can be prevented without causing apparent slow setting, low-dosage It is lower to play higher plasticizing effect;Using the polycarboxylate water-reducer powder of water-reducing rate >=30% so that SILICA FUME and metakaolin Water consumption do not increase.
Preferably, the alkali-activator is powdered potassium silicate, and fineness is 300 mesh.
Potassium silicate is soluble in water, ionizes out potassium ion, and potassium element is active alkali metal element, can excite SiO2With Al2O3In each chemical bond fast fracture, to accelerate SiO2And Al2O3Hydration reaction;The potassium silicate of 300 mesh can be quick It is dissolved in water and can thoroughly be dissolved in water and form aqueous solution.
Preferably, the cellulose ether is hydroxypropyl methyl cellulose ether, and the molecular weight of hydroxypropyl methyl cellulose ether is 100000.
On the one hand the hydroxypropyl methyl cellulose ether that molecular weight is 100,000 disclosure satisfy that the performance requirement in terms of construction, another Aspect, hydrophilic radical therein is more, so it is soluble easily in water, so that concrete has good viscosity.
In conclusion by adopting the above-described technical solution, the beneficial effects of the invention are as follows:Concrete can be significantly improved Workability sticks poly- property and anti-bleeding, reduces rebound of shotcrete rate and cracking risk, improves concrete hardening object early stage And the intensity in later stage, improve concrete hole gap structure, improves gunite concrete anti-permeability performance and durability.
Specific implementation mode
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive Feature and/or step other than, can combine in any way.The present invention is made specifically with reference to specific embodiment It is bright.
Embodiment one
Select specific surface area >=18000m2/ kg, average grain diameter≤300nm, water demand ratio≤115%, 28d activity indexs >=120% SILICA FUME, specific surface area >=600m2The ultra-fine metakaolin of/kg, 28d activity index >=110%, water-reducing rate >= 30% polycarboxylate water-reducer powder, fineness are the potassium silicate of 300 mesh, the hydroxypropyl methyl cellulose ether that molecular weight is 100,000;
By 100 parts following of above-mentioned SILICA FUME of mass fraction;15 parts of ultra-fine metakaolin;Polycarboxylate water-reducer powder 0.5 Part;1 part of potassium silicate;0.5 part of sodium hydroxide;0.5 part of sugar calcium retarder;0.1 part of triethanolamine;0.5 part of polyacrylamide and 0.5 part of hydroxypropyl methyl cellulose ether, which is uniformly mixed, forms product one, measures the specific surface area of product one, average grain diameter, needs water Amount ratio and 28d activity indexs.
Embodiment two
By 100 parts following of SILICA FUME of mass fraction;15 parts of metakaolin;0.5 part of water-reducing agent;1 part of alkali-activator;Hydrogen-oxygen Change 0.5 part of sodium;0.5 part of sugar calcium retarder;0.1 part of triethanolamine;The 0.5 part of mixing of 0.5 part of polyacrylamide and cellulose ether It is formed uniformly product two, measures specific surface area, average grain diameter, water demand ratio and the 28d activity indexs of product two.
Embodiment three
By 100 parts following of SILICA FUME of mass fraction;15 parts of metakaolin;0.8 part of water-reducing agent;2.0 parts of alkali-activator;Hydrogen 0.8 part of sodium oxide molybdena;0.8 part of sugar calcium retarder;0.2 part of triethanolamine;0.75 part of 0.7 part of polyacrylamide and cellulose ether are mixed Conjunction is formed uniformly product three, measures specific surface area, average grain diameter, water demand ratio and the 28d activity indexs of product three.
Example IV
By 100 parts following of SILICA FUME of mass fraction;15 parts of metakaolin;1 part of water-reducing agent;3 parts of alkali-activator;Hydroxide 1 part of sodium;1 part of sugar calcium retarder;0.3 part of triethanolamine;1 part of 1 part of polyacrylamide and cellulose ether are uniformly mixed and form production Product four measure specific surface area, average grain diameter, water demand ratio and the 28d activity indexs of product four.
Embodiment five
480 kilograms of cement, 30 kilograms of sands, 40 kilograms of stones, 24 kilograms of solidifying agent and 75 kilograms of water are mixed and stirred for Uniformly, the slump, arch rebound degree and the resistance to compression for measuring the concrete are slight.
Embodiment six
On the basis of embodiment one, the present embodiment by embodiment one be uniformly mixed 38.4 kilograms of modification SILICA FUME, 75 kilograms of 480 kilograms of cement, 30 kilograms of sand, 40 kilograms of stone, 24 kilograms of solidifying agent and water are mixed and stirred for uniformly, and measuring should The slump of concrete, arch rebound degree and resistance to compression are slight.
The property indices testing result table of each product in 1. one~example IV of embodiment of table
The 2. application effect of products table of comparisons of the present invention of table
As shown in Table 1, the comparison of product one and product two is it is found that select specific surface area >=18000m2/ kg, average grain diameter The SILICA FUME of≤300nm, water demand ratio≤115%, 28d activity index >=120%, specific surface area >=600m2/ kg, 28d activity The ultra-fine metakaolin of index >=110%, the polycarboxylate water-reducer powder of water-reducing rate >=30%, fineness are the potassium silicate of 300 mesh And the hydroxypropyl methyl cellulose ether that molecular weight is 100,000 is as the constituent component for being modified SILICA FUME, the specific surface of product one All indicators are better than products two for product, average grain diameter, water demand ratio and 28d activity indexs, so it is preferred that with specific surface area >= 18000m2The SILICA FUME of/kg, average grain diameter≤300nm, water demand ratio≤115%, 28d activity index >=120%, specific surface Product >=600m2The ultra-fine metakaolin of/kg, 28d activity index >=110%, the polycarboxylate water-reducer powder of water-reducing rate >=30%, Fineness is the potassium silicate of 300 mesh and hydroxypropyl methyl cellulose ether that molecular weight is 100,000 significantly improve it is concrete and easy Property, stick poly- property and anti-bleeding, reduce rebound of shotcrete rate and cracking risk, improve concrete hardening object early stage and after The intensity of phase improves concrete hole gap structure, improves gunite concrete anti-permeability performance and durability.
Each component it can be seen from the indices result that product two, product three and product four in table 1 measure Content is higher, and the properties of modified SILICA FUME are better.
As shown in Table 2, the slump, arch rebound degree and the compression strength for adding the concrete of modified SILICA FUME are superior to The performance of the concrete of modified SILICA FUME is not added, significantly improves the workability of concrete, stick poly- property and anti-bleeding, reduce Rebound of shotcrete rate and cracking risk improve the intensity in concrete hardening object early stage and later stage, improve concrete pore knot Structure improves gunite concrete anti-permeability performance and durability.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.

Claims (6)

1. a kind of modified SILICA FUME of gunite concrete, which is characterized in that count by weight ratio, the modification SILICA FUME is by following Component is made:
The slave power about proportioning can suitably be increased.
2. the modified SILICA FUME of gunite concrete according to claim 1, it is characterised in that:The specific surface of the SILICA FUME Product >=18000m2/ kg, average grain diameter≤300nm, water demand ratio≤115%, 28d activity index >=120%.
3. the modified SILICA FUME of gunite concrete according to claim 1, it is characterised in that:The metakaolin is ultra-fine Metakaolin, specific surface area >=600m2/ kg, 28d activity index >=110%.
4. the modified SILICA FUME of gunite concrete according to claim 1, it is characterised in that:The water-reducing agent is polycarboxylic acids Water-reducing agent powder, water-reducing rate >=30%.
5. the modified SILICA FUME of gunite concrete according to claim 1, it is characterised in that:The alkali-activator is powder The potassium silicate of shape, fineness are 300 mesh.
6. the modified SILICA FUME of gunite concrete according to claim 1, it is characterised in that:The cellulose ether is hydroxypropyl The molecular weight of ylmethyl cellulose ether, hydroxypropyl methyl cellulose ether is 100,000.
CN201810391061.3A 2018-04-27 2018-04-27 A kind of modified SILICA FUME of gunite concrete Pending CN108545975A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109265034A (en) * 2018-11-09 2019-01-25 中国水利水电第七工程局有限公司 A kind of wet shotcreting nanoscale admixture and its application method
CN109320118A (en) * 2018-11-09 2019-02-12 中国水利水电第七工程局有限公司 The dry spray of one kind or half wet shotcreting nanoscale admixture and its application method
CN111606625A (en) * 2020-05-29 2020-09-01 张红卫 Formula and preparation method of C70 high-strength self-compacting concrete
CN112374800A (en) * 2020-11-13 2021-02-19 衡阳市银利实业有限公司 Material for reducing cement and improving concrete strength
CN112441760A (en) * 2020-11-26 2021-03-05 中交武汉港湾工程设计研究院有限公司 Composite admixture for sprayed concrete and preparation method and application thereof
CN114804749A (en) * 2022-04-29 2022-07-29 中铁三局集团有限公司 Superfine modified silica micropowder low-resilience high-early-strength wet-spraying concrete and construction method thereof
CN114890762A (en) * 2022-03-24 2022-08-12 武汉源锦建材科技有限公司 Composite admixture for improving durability of sprayed concrete and preparation method thereof
CN114920491A (en) * 2022-06-06 2022-08-19 中交四航工程研究院有限公司 Rebound-reducing shotcrete admixture and preparation method thereof
CN115073054A (en) * 2022-07-21 2022-09-20 北京建筑大学 High-strength ultrafine additive for shotcrete, preparation method and use method thereof, low-resilience shotcrete and preparation method thereof

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CN109265034A (en) * 2018-11-09 2019-01-25 中国水利水电第七工程局有限公司 A kind of wet shotcreting nanoscale admixture and its application method
CN109320118A (en) * 2018-11-09 2019-02-12 中国水利水电第七工程局有限公司 The dry spray of one kind or half wet shotcreting nanoscale admixture and its application method
CN109265034B (en) * 2018-11-09 2021-12-28 中国水利水电第七工程局有限公司 Wet-spraying concrete nano-grade admixture and use method thereof
CN109320118B (en) * 2018-11-09 2021-12-28 中国水利水电第七工程局有限公司 Dry-spraying or wet-spraying concrete nano-grade admixture and use method thereof
CN111606625A (en) * 2020-05-29 2020-09-01 张红卫 Formula and preparation method of C70 high-strength self-compacting concrete
CN112374800A (en) * 2020-11-13 2021-02-19 衡阳市银利实业有限公司 Material for reducing cement and improving concrete strength
CN112441760A (en) * 2020-11-26 2021-03-05 中交武汉港湾工程设计研究院有限公司 Composite admixture for sprayed concrete and preparation method and application thereof
CN114890762A (en) * 2022-03-24 2022-08-12 武汉源锦建材科技有限公司 Composite admixture for improving durability of sprayed concrete and preparation method thereof
CN114804749A (en) * 2022-04-29 2022-07-29 中铁三局集团有限公司 Superfine modified silica micropowder low-resilience high-early-strength wet-spraying concrete and construction method thereof
CN114920491A (en) * 2022-06-06 2022-08-19 中交四航工程研究院有限公司 Rebound-reducing shotcrete admixture and preparation method thereof
CN115073054A (en) * 2022-07-21 2022-09-20 北京建筑大学 High-strength ultrafine additive for shotcrete, preparation method and use method thereof, low-resilience shotcrete and preparation method thereof

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Application publication date: 20180918

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