CN103145371A - High-flowability high-strength super-retarded steel tube concrete additive and preparation method thereof - Google Patents
High-flowability high-strength super-retarded steel tube concrete additive and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of construction materials, and particularly relates to a high-flowability high-strength super-retarded steel tube concrete additive. The additive is prepared by mixing metakaolin and composite modifier, wherein the mass ratio of the metakaolin to the composite modifier is (50-20):1; the composite modifier is prepared by mixing the following components in percentage by mass: 70-90% of amino silane, 5-15% of epoxy silane and 5-15% of methyl silicon oil, and the sum of the mass percents of the components is 100%. The additive serving as a steel tube concrete admixture can improve the working performance of steel tube concrete and retard the setting time, can obviously enhance the strength of the steel tube concrete at each stage (especially early strength) and simultaneously can effectively improve the volume stability of the steel tube concrete.
Description
Technical field
The invention belongs to building material technical field, be specifically related to high-strength super retardation setting type steel tube concrete soil additive of a kind of high workability and preparation method thereof.
Background technology
In recent years, to the greatly developing of Transportation Infrastructure Construction, highway in China is built net and is developed rapidly along with country.During this period, exist the physical features such as a large amount of mountains and riverss, valley due to China, this must just need thousands of bridge construction to be communicated with.Concrete filled steel tube is due to advantages such as its structure have that supporting capacity is high, good from heavy and light, plasticity, antifatigue, anti-seismic performance are good, and use widely with the Longspan Bridge engineering construction in.Compare other type bridge, the advantage such as that concrete-filled steel tubes arch bridge has is handsome in appearance, reasonable stress, material usage are few, remarkable in economical benefits, simultaneously, it more is adapted to the bridge construction in Duo Shan, area, many valleys.Therefore, the application of concrete filled steel tube will more and more receive people's concern.
At present, for the research of concrete filled steel tube mainly take its structural mechanical property as main, and for the design of material of the research of the core concrete material in concrete filled steel tube especially core concrete, controllable design and the operating technique thereof of expansion behavior, relatively less.In recent years, in using around the concrete filled steel tube engineering the construction problem in ubiquitous concrete and steel pipe unsticking problem, density problem and longspan structure engineering, launched corresponding research.Because the construction technology of large-span steel pipe concrete adopts pumping-up method, thereby concrete material there has been higher requirement more, has had good pumpability, super slow setting characteristic and self-compacting ability, also need possess simultaneously certain powerful feature morning.In addition, can occur shrinking, creeping after the concrete material sclerosis etc., cause producing between core concrete and steel pipe the gap, therefore, need material system to have good volume stability.
Yet single concrete material system obviously can't satisfy above-mentioned requirements.In order to guarantee the concrete serviceability of metakaolin and hardening characteristics, there is research to add high efficiency water reducing agent and super-retarder as composite additive in system, but this class compound additive might the bad problem of adaptability occur with between cement, and the effect of phase mutual interference might occur with the admixture that uses in construction process.Simultaneously, for the volume stability that guarantees that concrete material is good, great majority research is solved by mixing the methods such as swelling agent or aluminosulfate cement.Therefore, the common use concrete system of compound additive and swelling agent is more complicated, due to the phase mutual interference between various additives and and system in the impact of adaptability problem between other material, make its existing problems still in actual application.Therefore how to realize the excellent serviceability of concrete filled steel tube, super slow setting, self-compacting with strong, good early volume stability, remain further to be studied, be applied among Practical Project.
Summary of the invention
Technical problem to be solved by this invention is to provide high-strength super retardation setting type steel tube concrete soil additive of a kind of high workability and preparation method thereof for the deficiency of above-mentioned prior art existence, admixture as concrete filled steel tube, can improve the serviceability of concrete filled steel tube and delay time of coagulation, significantly improve the concrete filled steel tube intensity in each length of time, especially early strength can be improved the volume stability of concrete filled steel tube simultaneously effectively.
The present invention is that the technical scheme that the problem of the above-mentioned proposition of solution adopts is:
The high-strength super retardation setting type steel tube concrete soil additive of a kind of high workability, it is mixed by metakaolin and composite modifier, the mass ratio of metakaolin and composite modifier is (50-20): 1, wherein said composite modifier is followed successively by 70%-90%, 5%-15% by amino silane, epoxy radicals silicone hydride and methyl-silicone oil according to mass percent and the 5%-15% mixed preparing forms, and the per-cent sum of each component is 100%.
Press such scheme, described metakaolin is that kaolin is through grinding cooling making behind 500-1000 ℃ temperature lower calcination 0.5-6.0 hour.
Press such scheme, SiO in described metakaolin
2With Al
2O
3Quality percentage composition sum more than or equal to 50wt%, specific surface area is more than or equal to 2300m
2/ kg.
The preparation method of the high-strength super retardation setting type steel tube concrete soil additive of above-mentioned high workability comprises the steps:
(1) be followed successively by 70%-90%, 5%-15% and 5%-15% according to mass percent, amino silane, epoxy radicals silicone hydride and organic silicone oil are mixed, obtain composite modifier;
(2) mass ratio according to metakaolin and composite modifier is (50-20): 1, to put into ceramic ball mill through the metakaolin of oven dry, add composite modifier, grind 30-120min, namely obtain super retardation setting type high workability high strength steel pipe concrete additive.
Press such scheme, described metakaolin is that kaolin is through powder cooling making behind 500-1000 ℃ temperature lower calcination 0.5-6.0 hour.
Press such scheme, SiO in described metakaolin
2With Al
2O
3Quality percentage composition sum more than or equal to 50wt%, specific surface area is more than or equal to 2300m
2/ kg.
Press such scheme, described amino silane is colourless to light yellow transparent liquid, content 〉=95.0%, and density is 1.010 ± 0.005g/ml.
Compared with prior art, the invention has the beneficial effects as follows:
1) the present invention can obviously improve concrete early strength, when the volume of steel tube concrete soil additive of the present invention in ordinary mortar is 3wt%-15wt%, can significantly improve mortar 7d intensity more than 20%, and the 28d strength growth rate still can remain on more than 15%; When the volume of steel tube concrete soil additive of the present invention was 8%, 7d ultimate compression strength increased more than 30%, and for the metakaolin of equal volume, its rate of increase is 20%.Activated alumina and silicon-dioxide and hydrolysis product of cement calcium hydroxide generation secondary reaction of hydration in steel tube concrete soil additive of the present invention, its product (CSH gel and drated calcium aluminate etc.) has strengthened the degree of compactness of system effectively; And be combined in the interaction of the properties-correcting agent on metakaolin surface, the hydrated reaction product of properties-correcting agent forms the locus effect and makes metakaolin more effectively be scattered in gelling material, simultaneously, properties-correcting agent has improved the bonding action between metakaolin, cement and hydrated product.Therefore, steel tube concrete soil additive of the present invention can significantly improve concrete early strength.
2) the present invention significantly delays concrete time of coagulation, when the volume of steel tube concrete soil additive of the present invention in gelling material is 8%, delays the 17h left and right time of coagulation.Generate a large amount of hydroxyls due to properties-correcting agent in hydration process, formed adsorption film by the absorption of the calcium ion on cement particle surface and hinder aquation and carry out, or with the O on cement particle surface
2-Form hydrogen bond and hinder hydration reaction, thereby can effectively delay concrete time of coagulation.
3) the present invention significantly improves concrete serviceability, and when in normal concrete, the volume of metakaolin was 5wt%-10wt%, when the polycarboxylate water-reducer volume was 0.5%, its slump descended in the 40mm-100mm left and right.Yet when mixing the steel tube concrete soil additive of the present invention of equal volume, its degree of mobilization can remain unchanged substantially, and need not to add water reducer.The metakaolin particle surface due to properties-correcting agent generation Chemical bond or physisorption, properties-correcting agent forms the cage construction of oligopolymer in hydration process, make its space forming surface steric hindrance, thereby effectively improves rheological property.
4) the present invention can improve concrete volume stability, after adding metakaolin in normal concrete, due to volcanic ash effect and the micro-packing effect of metakaolin, can greatly improve concrete compactness, shrinks thereby effectively reduce volume of concrete.Yet adding of steel tube concrete soil additive of the present invention improved concrete serviceability and the active reaction rate that has improved metakaolin, more is conducive to reduce concrete volumetric shrinkage.Therefore, steel tube concrete soil additive of the present invention can improve concrete volume stability significantly, improves concrete endurance quality.
5) the present invention is good to different types of cement and concrete additive adaptability; usually can occur water reducer and cement in engineering reality and the bad phenomenon of consistency occur, and steel tube concrete soil additive of the present invention the bad problem of adaptability can not occur for the kind of various admixtures and cement.
Description of drawings
Fig. 1 is the mortar specimen drying shrinkage strain figure of test benchmark sample in application testing (two), metakaolin sample and embodiment 2 samples.
Fig. 2 is 7 days and 28 days ultimate compression strength, wherein A-benchmark sample of test benchmark sample in application testing (three), metakaolin sample and embodiment 4 samples; B-metakaolin sample; C-embodiment 4 samples.
Fig. 3 is the dry contractible graph of the concrete of test benchmark sample in application testing (three), metakaolin sample and embodiment 4 samples.
Embodiment
In order to understand better the present invention, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to the following examples.
Embodiment 1:
The high-strength super retardation setting type steel tube concrete soil additive of a kind of high workability, it is prepared at grinding in ball grinder 30min by metakaolin, composite modifier, wherein, the mass ratio of metakaolin and composite modifier is 20:1, and described properties-correcting agent has amino silane, epoxy radicals silicone hydride and methyl-silicone oil to be followed successively by 90%, 5% and 5% mixed preparing according to mass percent to form.Wherein, SiO in described metakaolin
2With Al
2O
3Quality percentage composition sum more than or equal to 50wt%, specific surface area is more than or equal to 2300m
2/ kg; Described amino silane is colourless to light yellow transparent liquid, content 〉=95.0%, and density is 1.010 ± 0.005g/ml.
The preparation method of the high-strength super retardation setting type steel tube concrete soil additive of above-mentioned high workability comprises the steps:
(1) be followed successively by 90%, 5% and 5% according to mass percent, amino silane, epoxy radicals silicone hydride and organic silicone oil are mixed, obtain composite modifier;
(2) mass ratio according to metakaolin and composite modifier is 20:1, will put into ceramic ball mill through the metakaolin of oven dry, adds composite modifier, grinds 30min, namely obtains super retardation setting type high workability high strength steel pipe concrete additive.
Embodiment 2:
The high-strength super retardation setting type steel tube concrete soil additive of a kind of high workability, it is prepared at grinding in ball grinder 75min by metakaolin, composite modifier, wherein, the mass ratio of metakaolin and composite modifier is 20:1, and described properties-correcting agent has amino silane, epoxy radicals silicone hydride and methyl-silicone oil to be followed successively by 90%, 5% and 5% mixed preparing according to mass percent to form.Wherein, SiO in described metakaolin
2With Al
2O
3Quality percentage composition sum more than or equal to 50wt%, specific surface area is more than or equal to 2300m
2/ kg; Described amino silane is colourless to light yellow transparent liquid, content 〉=95.0%, and density is 1.010 ± 0.005g/ml.
The preparation method of the high-strength super retardation setting type steel tube concrete soil additive of above-mentioned high workability comprises the steps:
(1) be followed successively by 90%, 5% and 5% according to mass percent, amino silane, epoxy radicals silicone hydride and organic silicone oil are mixed, obtain composite modifier;
(2) mass ratio according to metakaolin and composite modifier is 20:1, will put into ceramic ball mill through the metakaolin of oven dry, adds composite modifier, grinds 75min, namely obtains super retardation setting type high workability high strength steel pipe concrete additive.
Embodiment 3:
The high-strength super retardation setting type steel tube concrete soil additive of a kind of high workability, it is prepared at grinding in ball grinder 120min by metakaolin, composite modifier, wherein, the mass ratio of metakaolin and composite modifier is 20:1, and described properties-correcting agent has amino silane, epoxy radicals silicone hydride and methyl-silicone oil to be followed successively by 90%, 5% and 5% mixed preparing according to mass percent to form.Wherein, SiO in described metakaolin
2With Al
2O
3Quality percentage composition sum more than or equal to 50wt%, specific surface area is more than or equal to 2300m
2/ kg; Described amino silane is colourless to light yellow transparent liquid, content 〉=95.0%, and density is 1.010 ± 0.005g/ml.
The preparation method of the high-strength super retardation setting type steel tube concrete soil additive of above-mentioned high workability comprises the steps:
(1) be followed successively by 90%, 5% and 5% according to mass percent, amino silane, epoxy radicals silicone hydride and organic silicone oil are mixed, obtain composite modifier;
(2) mass ratio according to metakaolin and composite modifier is 20:1, will put into ceramic ball mill through the metakaolin of oven dry, adds composite modifier, grinds 120min, namely obtains super retardation setting type high workability high strength steel pipe concrete additive.
Embodiment 4:
The high-strength super retardation setting type steel tube concrete soil additive of a kind of high workability, it is prepared at grinding in ball grinder 90min by metakaolin, properties-correcting agent, wherein, the mass ratio of metakaolin and composite modifier is 30:1, and described properties-correcting agent has amino silane, epoxy radicals silicone hydride and methyl-silicone oil to be followed successively by 80%, 15% and 5% mixed preparing according to mass percent to form.Wherein, SiO in described metakaolin
2With Al
2O
3Quality percentage composition sum more than or equal to 50wt%, specific surface area is more than or equal to 2300m
2/ kg; Described amino silane is colourless to light yellow transparent liquid, content 〉=95.0%, and density is 1.010 ± 0.005g/ml.
The preparation method of the high-strength super retardation setting type steel tube concrete soil additive of above-mentioned high workability comprises the steps:
(1) be followed successively by 80%, 15% and 5% according to mass percent, amino silane, epoxy radicals silicone hydride and organic silicone oil are mixed, obtain composite modifier;
(2) mass ratio according to metakaolin and composite modifier is 30:1, will put into ceramic ball mill through the metakaolin of oven dry, adds composite modifier, grinds 90min, namely obtains super retardation setting type high workability high strength steel pipe concrete additive.
Embodiment 5:
The high-strength super retardation setting type steel tube concrete soil additive of a kind of high workability, it is prepared at grinding in ball grinder 90min by metakaolin, properties-correcting agent, wherein, the mass ratio of metakaolin and composite modifier is 50:1, and described properties-correcting agent has amino silane, epoxy radicals silicone hydride and methyl-silicone oil to be followed successively by 70%, 15% and 15% mixed preparing according to mass percent to form.Wherein, SiO in described metakaolin
2With Al
2O
3Quality percentage composition sum more than or equal to 50wt%, specific surface area is more than or equal to 2300m
2/ kg; Described amino silane is colourless to light yellow transparent liquid, content 〉=95.0%, and density is 1.010 ± 0.005g/ml.
The preparation method of the high-strength super retardation setting type steel tube concrete soil additive of above-mentioned high workability comprises the steps:
(1) be followed successively by 70%, 15% and 15% according to mass percent, amino silane, epoxy radicals silicone hydride and organic silicone oil are mixed, obtain composite modifier;
(2) mass ratio according to metakaolin and composite modifier is 50:1, will put into ceramic ball mill through the metakaolin of oven dry, adds composite modifier, grinds 90min, namely obtains super retardation setting type high workability high strength steel pipe concrete additive.
Application testing (one)
As investigating object, metakaolin and the preparation-obtained additive of embodiment 1-3 all replace gelling material configuration mortar with 6%, 8%, 10% equivalent with mortar specimen.Choose river sand (crossing the 2.36mm sieve), water cement ratio is 0.45, and cement mortar rate is 1:3, and water reducer is wooden sodium sulfonate's pulvis water reducer.Degree of mobilization according to GB/T 2429-2005 " Test method for fluidity of cement mortar " test benchmark sample, metakaolin sample, embodiment 1-3 sample; According to GB/T 17671-1999 " Test method for strength of hydraulic cement mortar ", with 7 days and 28 days ultimate compression strength of omnipotent pressure testing machine test benchmark sample and example.Degree of mobilization and the strength test of mortar specimen the results are shown in Table 1.
As shown in Table 1, when in the first, embodiment 1-3 sample, the water reducer consumption was reduced to 0.2%, the degree of mobilization of mortar specimen was compared the metakaolin sample of equal volume, all still improve, illustrate that additive of the present invention is to the serviceability effect of having greatly improved; The second, embodiment 1-3 sample and metakaolin sample are for the benchmark sample, and 7d and 28d intensity all show obvious growth; And the 7d intensity of comparative example 1-3 sample and equal volume metakaolin sample, strength growth rate is respectively 11.6%, 20.2% and 10.4%, illustrate that additive of the present invention has stronger promoter action to early strength, 28d intensity shows that development there is no impact on later strength simultaneously.
Application testing (two)
Select the proportioning of embodiment 2, with clean slurry as investigating object, measuring method with reference to cement setting time in GB/T1346-2001 " cement normal consistency water consumption, time of coagulation, the stability method of inspection ", first, the final setting time of difference assay standard sample (new P.I 52.5 cement of China), metakaolin sample and embodiment 2 samples, measurement result is as shown in table 2, wherein in the metakaolin sample, metakaolin is that the quality such as 8% replaces cement according to volume, and additive described in embodiment 2 samples is that the quality such as 8% replaces cement according to volume.
As shown in Table 2 metakaolin mix 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 embodiment 2 described additives, wherein the presetting period for the benchmark sample, has delayed the 17h left and right, illustrates that additive of the present invention has stronger delayed coagulation to concrete.
Select the proportioning of embodiment 2, with reference to JCJ/T 70-2009 standard, 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 that 20 ℃, relative humidity are maintenance in the environment of 60%RH that form removal is placed on temperature, after this surveys respectively its 3d, 5d, 7d, 14d and 28d length.The rate of expansion of test specimen is calculated with following formula:
, in formula:
-test specimen is in the rate of expansion (%) in the t days length of time;
-test specimen is in the length (mm) in the t days length of time;
The datum length of-test specimen (mm);
The length (mm) of-gauge head (namely burying nail).
As shown in Figure 1, when described in embodiment 2, the volume of steel tube concrete soil additive was 8%, for metakaolin, steel tube concrete soil additive of the present invention had obviously reduced the dry shrinkage of mortar specimen, more is conducive to the volume stability of mortar.
Application testing (three)
Take concrete sample as investigating object, metakaolin and embodiment 4 gained additives all replace gelling material configuration concrete with 8% equivalent, and water reducer is polycarboxylic acids dehydragent.According to the slump of GB/T 50080-2002 " Standard for test methods of properties of ordinary concrete mixture standard " test benchmark sample, metakaolin sample and embodiment 4 samples, as shown in table 3; According to GB/T 50081-2002 " standard for test methods of mechanical properties of ordinary concrete ", with 7 days and 28 days ultimate compression strength of omnipotent pressure testing machine test benchmark sample, metakaolin sample and embodiment 4 samples, as shown in Figure 2; According to GB/T 50089-2009 " Standard for test methods of longterm performance and durability of ordinary concrete standard ", adopt contact process to measure concrete dry shrinkage, as shown in Figure 3.
As shown in Table 3, when the volume of the described steel tube concrete soil additive of embodiment 4 was 8%, in the situation that do not add water reducer, it is for the improvement effect of the rheological property metakaolin with respect to equal volume, and was still apparent in view; Simultaneously, as can be seen from Figure 2, with regard to 7d intensity, it is 12.4% that embodiment 4 reaches 9.6%, 28 day strength growth rate with respect to the metakaolin rate of increase of equal volume.Illustrate that steel tube concrete soil additive of the present invention not only can improve serviceability, and can promote the growth of early strength.
As shown in Figure 3, the drying shrinkage of mixing rear concrete sample of metakaolin has been compared significant reduction with the benchmark sample, and contrast embodiment 4 samples of equal volume, its drying shrinkage is further reduced, and this explanation steel tube concrete soil additive of the present invention can significantly improve concrete volume stability.
Claims (7)
1. high-strength super retardation setting type steel tube concrete soil additive of high workability, it is characterized in that it is mixed by metakaolin and composite modifier, the mass ratio of metakaolin and composite modifier is (50-20): 1, wherein said composite modifier is followed successively by 70%-90%, 5%-15% by amino silane, epoxy radicals silicone hydride and methyl-silicone oil according to mass percent and the 5%-15% mixed preparing forms, and the per-cent sum of each component is 100%.
2. the high-strength super retardation setting type steel tube concrete soil additive of a kind of high workability according to claim 1, 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.
3. the high-strength super retardation setting type steel tube concrete soil additive of a kind of high workability according to claim 1, is characterized in that SiO in described metakaolin
2With Al
2O
3Quality percentage composition sum more than or equal to 50wt%, specific surface area is more than or equal to 2300m
2/ kg.
4. the preparation method of the high-strength super retardation setting type steel tube concrete soil additive of high workability claimed in claim 1 is characterized in that it includes following steps:
(1) be followed successively by 70%-90%, 5%-15% according to mass percent and 5%-15% mixes amino silane, epoxy radicals silicone hydride and organic silicone oil, obtain composite modifier;
(2) mass ratio according to metakaolin and composite modifier is (50-20): 1, to put into ceramic ball mill through the metakaolin of oven dry, add composite modifier, grind 30-120min, namely obtain super retardation setting type high workability high strength steel pipe concrete additive.
5. the preparation method of the high-strength super retardation setting type steel tube concrete soil additive of high workability according to claim 4, is characterized in that described metakaolin is that kaolin is through powder cooling making behind 500-1000 ℃ temperature lower calcination 0.5-6.0 hour.
6. the preparation method of the high-strength super retardation setting type steel tube concrete soil additive of high workability according to claim 4, is characterized in that SiO in described metakaolin
2With Al
2O
3Quality percentage composition sum more than or equal to 50wt%, specific surface area is more than or equal to 2300m
2/ kg.
7. the preparation method of the high-strength super retardation setting type steel tube concrete soil additive of high workability according to claim 4, is characterized in that described amino silane is colourless to light yellow transparent liquid, content 〉=95.0%, and density is 1.010 ± 0.005g/ml.
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Cited By (4)
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| CN104119010A (en) * | 2014-08-15 | 2014-10-29 | 武汉理工大学 | Retarding type high-fluidity high-strength underwater concrete additive and preparation method thereof |
| CN105645836A (en) * | 2016-01-05 | 2016-06-08 | 萧县良宇混凝土有限责任公司 | High-flowability anti-cracking concrete additive and preparation method thereof |
| 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 |
| CN113264701A (en) * | 2021-04-20 | 2021-08-17 | 南华大学 | Coal gangue powder used as pumping concrete admixture and preparation method and application thereof |
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| CN102515608A (en) * | 2011-12-19 | 2012-06-27 | 武汉理工大学 | Modified metakaolin-based permeation-resistant and crack-resistant agent for concrete |
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| CN102515608A (en) * | 2011-12-19 | 2012-06-27 | 武汉理工大学 | Modified metakaolin-based permeation-resistant and crack-resistant agent for concrete |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104119010A (en) * | 2014-08-15 | 2014-10-29 | 武汉理工大学 | Retarding type high-fluidity high-strength underwater concrete additive and preparation method thereof |
| CN105645836A (en) * | 2016-01-05 | 2016-06-08 | 萧县良宇混凝土有限责任公司 | High-flowability anti-cracking concrete additive and preparation method thereof |
| 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 |
| CN113264701A (en) * | 2021-04-20 | 2021-08-17 | 南华大学 | Coal gangue powder used as pumping concrete admixture and preparation method and application thereof |
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| CN103145371B (en) | 2015-04-08 |
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