CN104119010A - Retarding type high-fluidity high-strength underwater concrete additive and preparation method thereof - Google Patents
Retarding type high-fluidity high-strength underwater concrete additive and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of building materials, and particularly relates to a retarding type high-fluidity high-strength underwater concrete additive. The additive can effectively improve the strength and dispersion resistance of concrete and has the advantages of simple preparation process, low production cost and the like. The additive is characterized by comprising metakaolin and a composite modifier. The mass ratio of the metakaolin to the composite modifier is (50:1)-(15:1); the composite modifier is prepared by mixing 70-85% of polyacrylamide, 10-20% of superplasticizer and 5-15% of organic water-soluble polysaccharide substances all by mass based on a total of 100%. As an additive for underwater concrete, the additive can improve the working performance and dispersion resistance of underwater concrete and delay the setting time; and the strength at each age, particularly the early age strength of underwater concrete is remarkably improved. Meanwhile, the volume stability of underwater concrete can be effectively improved.
Description
Technical field
The invention belongs to building material technical field, be specifically related to high-strength underwater concrete additive of a kind of retardation setting type high workability and preparation method thereof.
Background technology
Be accompanied by human society and civilized development and progress, owing to becoming fewer and feweri for the land resources developing, the feeler of the development of human civilization will extend to ocean, thus 21 century will be the century of ocean exploitation, concrete underwater construction will get more and more.And underwater concrete structure is very complicated.Therefore,, except requiring concrete intensity, also require construction technology simple, economical rationality, good endurance and environmentally safe.In engineering, concrete remains one of material of construction of main and consumption maximum under water, and the performance of underwater concrete will directly affect the quality of underwater engineering.Therefore, non-dispersible underwater concrete becomes the emphasis of numerous scholars and engineering technical personnel's research day by day.And for anti-dispersant, the performance of non-dispersible underwater concrete being had to decisive meaning, the additive development of non-dispersible underwater concrete becomes the main direction of research.
Metakaolin is a kind of Silicon-rich aluminate matter inorganic mineral, by kaolin dehydration after proper temperature (500-1000 ℃) calcining, formed, there is very strong pozzolanic activity, now as active extra material, apply in cement concrete, mortar and other cement products.Reactive behavior based on metakaolin, can prepare the concrete material of compact high-strength, weather resistance and excellent anti-corrosion performance, has now become the focus of material circle research.
Yet single concrete material system obviously cannot meet above-mentioned requirements.But in Patents, have and singly mix cellulose family and polypropylene-base tackify material preparation underwater concrete, but resulting concrete strength is lower, and land and water strength ratio only has 65%-70% (7d) and 70%-75% (28d), and concrete slump-loss is large, be not suitable for transportation at a distance and construction.Make a general survey of on the research of concrete capable of not dispersing under water and application result and see, the performance of the non-dispersible underwater concrete of preparation has limitation, the strength grade of the underwater concrete of building is lower (C30 following) generally, and frost resistance to non-dispersible underwater concrete, anti-Cl
-the weather resistance such as penetrating quality also lack research.Therefore how to realize the excellent serviceability, Self-leveling of underwater concrete with strong, good early volume stability, need further research, be applied among Practical Project.
Summary of the invention
The object of the present invention is to provide and a kind ofly there is excellent serviceability, slow setting, Self-leveling with the high-strength underwater concrete additive of retardation setting type high workability of strong, good early volume stability.It can more effectively excite the pozzolanic activity of metakaolin in cement-based material, is especially embodied in early strength aspect, has mobility loss little simultaneously, for concrete weather resistance, also has a better role.
To achieve these goals, technical scheme of the present invention is:
The high-strength underwater concrete additive of a kind of retardation setting type high workability, it is characterized in that, described additive comprises metakaolin and composite modifier, the mass ratio of described metakaolin and composite modifier is 50:1-15:1, described composite modifier according to mass percent, is followed successively by 70%-85%, 10%-20% by polyacrylamide, high efficiency water reducing agent and organic water dissolubility polysaccharose substance and 5%-15% mixed preparing forms, and the mass percent sum of each component is 100%.
In such scheme, described metakaolin be kaolin through grinding cooling making behind 500-1000 ℃ temperature lower calcination 0.5-6.0 hour, wherein, SiO in metakaolin
2with Al
2o
3quality percentage composition sum>=50wt%, specific surface area>=2300m
2/ kg.
In such scheme, described polyacrylamide is anionic, solid content >=95.0%, and molecular weight is 1000-2000 ten thousand, the scope of effective pH value is 7-14, white solid.
In such scheme, described high efficiency water reducing agent is Powdered polycarboxylate water-reducer.
In such scheme, described organic water dissolubility polysaccharose substance is sucrose, Sunmorl N 60S or glucose, content >=99.0%, white powder solid.
The preparation method of the described high-strength underwater concrete additive of retardation setting type high workability, it is characterized in that: will put into ball mill through the metakaolin of drying, add composite modifier, milling time is 30-120min, obtains the high-strength underwater concrete additive of described retardation setting type high workability.When using, by the additive making, by massfraction, be that 3%-15% replaces cement, obtain underwater concrete gelling material.
In technical scheme of the present invention, in modification metakaolin modifying process, metakaolin is under mechanical effect, composite modifier is adsorbed on the surface of metakaolin by physical action and chemical action, enter reunion metakaolin particle gap, it has two significant functions: the one, and the metakaolin of agglomerated fully disperses, and the 2nd, the modification to metakaolin particle surface.
The invention has the advantages that:
1) the present invention can obviously improve the early strength of tremie concrete, in ordinary mortar, the volume of modification metakaolin base underwater concrete additive is 3wt%-15wt%, can significantly improve mortar 7d intensity more than 20%, and 28d strength growth rate still can remain on more than 15%, and remaining on 70%～85%, 28 days land and water strength ratios, 7 days land and water strength ratios remain on 80～90%.This be metakaolin as a kind of concrete mineral admixture, due to its pozzolanic activity and micro-packing effect, can significantly improve concrete early strength and later stage weather resistance.
2) modification metakaolin base underwater concrete additive utilizes the acting in conjunction of metakaolin and polyacrylamide, improves concrete anti-dispersing property.Metakaolin has high-specific surface area and fineness, after admixture, improved the water retention property of mixing concrete thing, concrete cohesion performance is increased, and can in grout, change the current potential of particle surface in the thick components system of mixture together with polyacrylamide, reduced interparticle repulsive interaction, increase the effect of inhaling mutually between particle, made heterogeneous coarse dispersion agglomerated together, played the effect of thickening.And add water-soluble organic polymer polyacrylamide material, structure and the effect of molecule side chain due to its polymer molecular chain, can be wound network-like structure, thereby more can give full play to reunion cement granules, make concrete generation thickening or throwing out, further improve concrete anti-dispersive ability.Polycarboxylate water-reducer can obviously increase concrete serviceability, by organic water dissolubility polysaccharose substance, can regulate concrete time of coagulation.Polycarboxylate water-reducer and sucrose form diffusion double layer at cement particle surface, changed its electro kinetic potential, irreducible water in the space grid structure forming in cement hydration process is discharged, the mobility of cement concrete is increased considerably, the static row who improves cement tears ability and the three-dimensional ability of tearing open of arranging open, thereby delay under water regardless of cement hydration process in loose sand slurry, reduce degree of mobilization through time lose.After adding modification metakaolin based additive, land and water, concrete seven sky strength ratio is 70%～85%, and within 28 days, land and water strength ratio is 80～90%.Good fluidity, has better fillibility and self compacting ability.There is the good slump and divergence, quiet stopping 1 hour, Slump Time losing of Large is little.
3) the present invention can improve concrete volume stability and weather resistance, in normal concrete, add after metakaolin, volcanic ash effect and micro-packing effect due to metakaolin, can greatly improve concrete compactness, thereby effectively reduce volume of concrete contraction and improve concrete weather resistance.Yet adding of modification metakaolin, has improved the serviceability and the active reaction rate that has improved metakaolin of underwater concrete, is more conducive to reduce concrete volumetric shrinkage and improves concrete weather resistance.Therefore, modification metakaolin can improve concrete volume stability significantly, improves concrete endurance quality.
Accompanying drawing explanation
Fig. 1 is benchmark sample, metakaolin sample and embodiment 1 mortar specimen drying shrinkage figure.
Embodiment
In order to understand better the present invention, below in conjunction with embodiment, further illustrate content of the present invention, but content of the present invention is not only confined to the following examples.
Embodiment 1
The high-strength underwater concrete additive of a kind of retardation setting type high workability, it is obtained at grinding in ball grinder 30min by metakaolin, composite modifier, wherein, the mass ratio of metakaolin and composite modifier is 15:1, and described composite modifier is followed successively by 80%, 15% and 5% mixed preparing by polyacrylamide, polycarboxylate water-reducer and sucrose according to mass percent and forms.
Using mortar specimen as investigating object, and metakaolin replaces gelling material with 6%, 8%, 12% equivalent respectively and adds 1% water reducer configuration mortar.Choose the high-strength underwater concrete additive of retardation setting type high workability of river sand (crossing 2.36mm sieve) and embodiment 1 respectively with 6%, 8%, 12% admixture, water cement ratio is 0.45.
According to the degree of mobilization of the mixture of the additive of GB/T 2429-2005 < < Test method for fluidity of cement mortar > > test benchmark samples, metakaolin sample, embodiment 1; According to GB/T 17671-1999 < < Test method for strength of hydraulic cement mortar > >, by 7 days and the 28 days ultimate compression strength of omnipotent pressure testing machine test benchmark sample and embodiment 1.Anti-dispersiveness is carried out with reference to the company standard non-dispersible underwater concrete construction technique normalizing Q/CNPC 92-2003 of China National Petroleum Corporation (CNPC).
The performance of table 1 mortar specimen
Table 1 has illustrated: in embodiment 1, the degree of mobilization of mortar specimen is compared metakaolin and the benchmark sample of equal volume, is all greatly improved.The high-strength underwater concrete additive of retardation setting type high workability of this explanation embodiment 1, to the serviceability effect of having greatly improved, can be realized mortar Self-leveling.The additive of embodiment 1 and metakaolin are for benchmark sample, due to the viscosifying action of metakaolin with to intensity promoter action, more than 7d just can reach 30MPa, and 7d and 28d land and water intensity all show obvious growth, anti-dispersing property also has further raising, has met the requirement of Q/CNPC 92-2003 antagonism dispersing property.This also illustrates that the present invention has stronger promoter action to early strength, and 28d intensity shows that development there is no impact on later strength simultaneously, also makes test specimen have higher anti-dispersing property.
Selecting the volume of the additive of embodiment 1 is 8%, using and only starch as investigating object, with reference to the measuring method of cement setting time in GB/T1346-2001 < < cement normal consistency water consumption, time of coagulation, stability method of inspection > >, respectively the additive of assay standard sample (the new P.O42.5 cement of China), metakaolin sample and embodiment 1 quality such as (replace cement) volume are 8% just, final setting time.
The impact of the additive of table 2 embodiment 1 on time of coagulation
Table 2 has illustrated: the mixing of metakaolin make slurry just, all corresponding shortenings of final setting time.Yet the adding the time of coagulation that has but delayed widely gelling material of the additive of embodiment 1, wherein the presetting period, for benchmark sample, has delayed 8h left and right.Illustrate that the present invention has stronger delayed coagulation to concrete, met the requirement of Q/CNPC 92-2003 to time of coagulation.
Selecting the volume of the additive of embodiment 1 is 8%, with reference to JCJ/T 70-2009 standard, carries out drying shrinkage experiment, and it is that 20 ℃, relative humidity are greater than maintenance under the condition of 90%RH that the moulding in the die trial of 3 25mm * 25mm * 280mm of all test specimens is placed on temperature.It is maintenance in 20 ℃, the relative humidity environment that is 60%RH that form removal is placed on temperature, after this surveys respectively its 3d, 5d, 7d, 14d and 28d length, as shown in Figure 1.
Fig. 1 has illustrated: when the volume of the additive in embodiment 1 is 8%, for metakaolin, the additive in embodiment 1 has obviously reduced the dry shrinkage of mortar specimen.Illustrate that the present invention is more conducive to the volume stability of mortar.
Embodiment 2
The high-strength underwater concrete additive of a kind of retardation setting type high workability, it by metakaolin, composite modifier at grinding in ball grinder 120min, wherein, the mass ratio of metakaolin and composite modifier is 20:1, and described composite modifier is followed successively by 75%, 20% and 5% mixed preparing by polyacrylamide, polycarboxylate water-reducer and sucrose according to mass percent and forms.
Take concrete sample as investigating object, the additive of embodiment 2 replaces gelling material configuration concrete with 10% equivalent, according to the slump and the divergence of GB/T 50080-2002 < < Standard for test methods of properties of ordinary concrete mixture standard > > fresh concrete mixtures; According to GB/T 50081-2002 < < standard for test methods of mechanical properties of ordinary concrete > >, by additive 7 days and the 28 days ultimate compression strength of omnipotent pressure testing machine test benchmark sample and embodiment 2; The dispersed experiment of agent on crack resistance of concrete is carried out according to Q/CNPC92-2003.Cement number of dropouts is that 1.1%, pH is 11.2, and being suspended thing content is 132mg/L.7 days land and water strength ratios are that 72%, 28 day land and water strength ratio is 83%; Non-dispersible underwater concrete divergence is 452mm, and during 1h, Slump Time losing of Large 9.2%.
Embodiment 3
The high-strength underwater concrete additive of a kind of retardation setting type high workability, it is obtained at grinding in ball grinder 90min by metakaolin, composite modifier, wherein, the mass ratio of metakaolin and composite modifier is 30:1, and described composite modifier is followed successively by 70%, 25% and 5% mixed preparing by polyacrylamide, polycarboxylate water-reducer and sucrose according to mass percent and forms.
Take concrete sample as investigating object, metakaolin based additive replaces gelling material configuration concrete with 12% equivalent, according to the slump and the divergence of GB/T 50080-2002 < < Standard for test methods of properties of ordinary concrete mixture standard > > test fresh concretes; According to GB/T 50081-2002 < < standard for test methods of mechanical properties of ordinary concrete > >, by 7 days and 28 days ultimate compression strength of omnipotent pressure testing machine test benchmark sample and example; The dispersed experiment of agent on crack resistance of concrete is carried out according to Q/CNPC 92-2003.Cement number of dropouts is that 1.0%, PH is 10.8, and being suspended thing content is 132mg/L.7 days land and water strength ratios are that 82%, 28 day land and water strength ratio is 88%; Non-dispersible underwater concrete divergence is 512mm, and during 1h, Slump Time losing of Large 9.4%.
Claims (7)
1. the high-strength underwater concrete additive of retardation setting type high workability, it is characterized in that, described additive comprises metakaolin and composite modifier, the mass ratio of described metakaolin and composite modifier is 50:1-15:1, described composite modifier according to mass percent, is followed successively by 70%-85%, 10%-20% by polyacrylamide, high efficiency water reducing agent and organic water dissolubility polysaccharose substance and 5%-15% mixed preparing forms, and the mass percent sum of each component is 100%.
2. the high-strength underwater concrete additive of a kind of retardation setting type high workability according to claim 1, it is characterized in that: described metakaolin is that kaolin is through grinding cooling making behind 500-1000 ℃ temperature lower calcination 0.5-6.0 hour, wherein, SiO in metakaolin
2with Al
2o
3quality percentage composition sum>=50wt%, specific surface area>=2300m
2/ kg.
3. the high-strength underwater concrete additive of retardation setting type high workability according to claim 1, is characterized in that: described polyacrylamide is anionic, solid content >=95.0%, and molecular weight is 1000-2000 ten thousand, the scope of effective pH value is 7-14.
4. the high-strength underwater concrete additive of retardation setting type high workability according to claim 1, is characterized in that: described high efficiency water reducing agent is Powdered polycarboxylate water-reducer.
5. the high-strength underwater concrete additive of retardation setting type high workability according to claim 1, is characterized in that: described organic water dissolubility polysaccharose substance is sucrose, Sunmorl N 60S or glucose.
6. the preparation method of the high-strength underwater concrete additive of retardation setting type high workability according to claim 1, it is characterized in that: will put into ball mill through the metakaolin of drying, add composite modifier, milling time is 30-120min, obtains the high-strength underwater concrete additive of described retardation setting type high workability.
7. the application of the high-strength underwater concrete additive of retardation setting type high workability as claimed in claim 1 in concrete, is characterized in that, the volume scope of described additive is 8-12%.
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| CN105645833A (en) * | 2016-01-05 | 2016-06-08 | 萧县良宇混凝土有限责任公司 | Concrete additive and preparation method thereof |
| CN106045367A (en) * | 2016-05-26 | 2016-10-26 | 武汉源锦商品混凝土有限公司 | Dispersion-resistant high-strength concrete additive and preparation method thereof |
| CN108178585A (en) * | 2018-02-28 | 2018-06-19 | 兴宁市龙江建材实业有限公司 | A kind of road and bridge cement |
| CN110304872A (en) * | 2019-08-16 | 2019-10-08 | 陈晓星 | A kind of nano modification cement base not dispersion and preparation method thereof under water |
| CN111153656A (en) * | 2020-01-18 | 2020-05-15 | 杭州申华混凝土有限公司 | Green slow-setting concrete and production method thereof |
| CN111732364A (en) * | 2019-12-12 | 2020-10-02 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Early strength agent for concrete prefabricated member and preparation method thereof |
| CN114605120A (en) * | 2022-03-23 | 2022-06-10 | 广东水电二局股份有限公司 | Underwater undispersed concrete and preparation method thereof |
| CN115321878A (en) * | 2022-08-11 | 2022-11-11 | 龙岩学院 | Viscosity regulator for ready-mixed high-strength concrete and use method thereof |
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| CN115321878A (en) * | 2022-08-11 | 2022-11-11 | 龙岩学院 | Viscosity regulator for ready-mixed high-strength concrete and use method thereof |
| CN115321878B (en) * | 2022-08-11 | 2023-08-11 | 龙岩学院 | Viscosity regulator for ready-mixed high-strength concrete and use method thereof |
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