CN110563418A - Steam-curing-free ultra-high performance concrete and preparation method thereof - Google Patents
Steam-curing-free ultra-high performance concrete and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention provides a steam-curing-free ultra-high performance concrete and a preparation method thereof, wherein the steam-curing-free ultra-high performance concrete comprises the following raw materials in parts by weight: 550-900 parts of Portland cement or ordinary Portland cement, 50-300 parts of sulphoaluminate cement, 50-300 parts of silica fume, 5-50 parts of nano silicon dioxide, 1000-1300 parts of quartz sand, 35-200 parts of steel fiber, 20-45 parts of additive and 180-220 parts of water. The additive is as follows: 10-40 parts of early strength type polycarboxylic acid water reducing agent, 10-40 parts of water reducing type polycarboxylic acid high-performance water reducing agent, 0.5-5.0 parts of inorganic salt early strength agent, 0.1-2 parts of organic early strength agent, 0.03-0.1 part of defoaming agent and 25-50 parts of water. Compared with the prior art, the ultra-high performance concrete prepared by the invention has excellent mechanical properties, is simple in preparation process, does not need water curing or steam curing, can greatly save energy consumption, and has important practical application value.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to steam-curing-free ultrahigh-performance concrete and a preparation method thereof.
Background
Ultra-High Performance Concrete (UHPC) is used as a novel cement-based structural material, and has excellent properties of ultrahigh strength, High durability, High toughness and the like. Ultra-high performance concrete enables a large span of engineering materials, which is also the most innovative cement-based engineering material over the last three decades. However, the performance of the ultra-high performance concrete developed at present is greatly influenced by the curing system, and in order to obtain higher mechanical properties, a thermal curing system is required, so that the ultra-high performance concrete is more suitable for prefabrication production in a factory at present, and has high energy consumption and high production cost.
Patent CN105418010A published 3, 23 and 2016 discloses an ultrahigh-performance prefabricated part and a preparation method thereof, wherein the prefabricated part is maintained in a steam maintenance mode, and the process is complex and the cost is high.
Patent CN105064408A discloses an ultrahigh-performance concrete prefabricated part and a preparation method thereof, and the demolded ultrahigh-performance concrete manhole cover needs to be thermally cured in steam or water at 80-100 ℃, so that the energy consumption is high and the cost is high.
Patent CN108059414A published in 2018, 5 month and 22 days discloses river sand basalt active powder concrete and a preparation method thereof, after the active powder concrete is demolded, water curing is carried out for a period of time, the water curing temperature is 20-40 ℃, the curing time is 2-4 days, steam curing is carried out after the water curing is finished, the temperature rising speed is not more than 15 ℃/h, the final temperature is 75-85 ℃, and the curing time is 2-4 days. The maintenance method is complex and the cost is high.
Disclosure of Invention
the invention aims to provide the steam-curing-free ultra-high performance concrete which has excellent mechanical properties, does not need a thermal curing system, has low energy consumption and has good market prospect.
The invention also aims to provide a preparation method of the steam-curing-free ultrahigh-performance concrete, which has simple process and low cost.
The specific technical scheme of the invention is as follows:
The steam-curing-free ultra-high performance concrete comprises the following raw materials in parts by weight: 550-900 parts of Portland cement or ordinary Portland cement, 50-300 parts of sulphoaluminate cement, 50-300 parts of silica fume, 5-50 parts of nano silicon dioxide, 1000-1300 parts of quartz sand, 35-200 parts of steel fiber, 20-45 parts of additive and 180-220 parts of water.
The additive comprises the following raw materials in parts by weight: 10-40 parts of early strength type polycarboxylate superplasticizer, 10-40 parts of water-reducing polycarboxylate high-performance water reducer, 0.5-5.0 parts of inorganic salt early strength agent, 0.1-2 parts of organic early strength agent, 0.03-0.1 part of defoaming agent and 25-50 parts of water.
the early strength polycarboxylate superplasticizer is selected from MasterGlenium ACE8206 or VIVID720P of Shanghai Sanrui.
The water reducing rate of the water reducing type polycarboxylic acid high-performance water reducing agent is not less than 32%.
The inorganic salt early strength agent is one or two of sodium thiocyanate or lithium sulfate.
The organic early strength agent is one or more of diethanol amine or diethanol monoisopropanolamine.
The defoaming agent is an organic silicon defoaming agent or a polyether defoaming agent.
The portland cement or ordinary portland cement is 42.5 grade or 52.5 grade.
the sulphoaluminate cement is 42.5 grade.
SiO of the silica fume2The content is more than 90 percent, and the specific surface area is not less than 14000m2/kg。
The average grain diameter of the nano silicon dioxide is 10-15nm, and the SiO is2The content is more than 99 percent.
The particle size of the quartz sand is 20-100 meshes.
The length of the steel fiber is 12-25mm, and the diameter is 0.16-0.22 mm.
The invention provides a preparation method of steam-curing-free ultrahigh-performance concrete, which comprises the following steps:
1) Weighing an early strength type polycarboxylate superplasticizer, a water-reducing polycarboxylate high-performance water reducer, an inorganic salt early strength agent, an organic early strength agent, a defoaming agent and water according to the formula of the additive, and uniformly stirring for later use;
2) Uniformly stirring and mixing the Portland cement or the ordinary Portland cement, the sulphoaluminate cement, the nano-silica, the silica fume and the quartz sand according to the formula ratio, and then adding the steel fiber according to the formula ratio while stirring;
3) Adding the admixture prepared in the step 1) and water with the formula amount into the mixture prepared in the step 2), and stirring to prepare the steam-curing-free ultra-high performance concrete.
The Portland cement or the common Portland cement, the sulphoaluminate cement, the silica fume and the quartz sand with the formula amount in the step 2) are stirred and mixed for 60 s.
further, the steel fiber with the formula amount is added while stirring in the step 2) to prevent the steel fiber from agglomerating.
The feeding time of the steel fiber in the step 2) is controlled to be 60-120 s.
And 2) after the steel fiber is added in the step 2), continuing stirring for 60 s.
Further, placing the prepared steam-curing-free ultrahigh-performance concrete in a concrete mould in a pouring mode, placing the concrete mould on a concrete vibrating table, vibrating for 10-20s, standing for 6h, and then placing the concrete mould in a standard curing room for curing.
The raw materials of the invention have the following functions:
sulphoaluminate cement: the hydration speed is high, and the early height of the ultrahigh concrete can be rapidly improved.
Nano silicon dioxide: the nano silicon dioxide is far smaller than cement and silica fume particles, has a large specific surface area, and increases the density of the ultra-high performance concrete in a microscopic scale due to the filling effect of the nano silicon dioxide. The activity of the volcanic ash is much higher than that of the silicon ash and the fly ash. The nano silicon dioxide reacts with calcium hydroxide which is unfavorable for strength to be converted into C-S-H gel, and the C-S-H gel is filled between cement hydration products, so that the strength is effectively increased.
Steel fiber: can effectively improve the compression strength and the breaking strength of the ultra-high performance concrete.
early strength type polycarboxylic acid water reducing agent: has higher water reducing rate, can quickly promote the hydration of cement and improve the early strength of concrete.
The water-reducing polycarboxylic acid high-performance water reducing agent comprises the following components: has high water reducing rate and slump retaining performance.
Inorganic salt early strength agent: can quickly promote the hydration of cement and improve the early strength of concrete.
Diethanolamine: can quickly promote the hydration of cement and improve the early strength of concrete.
Diethanolisopropanolamine: can quickly promote the hydration of cement and improve the early and later strength of concrete.
Defoaming agent: eliminate harmful air bubbles in the concrete, improve the compactness of the concrete on one hand, increase the strength of the concrete, and reduce the surface air holes of the concrete product on the other hand.
Compared with the prior art, the ultra-high performance concrete prepared by the invention has excellent mechanical properties. And the preparation process is simple, water curing or steam curing is not needed, the energy consumption can be greatly saved, and the production cost is reduced. Has important practical application value.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention.
Example 1
A preparation method of steam-curing-free ultrahigh-performance concrete comprises the following steps:
1) Weighing an early strength type polycarboxylate superplasticizer MasterGlenium ACE 820650 g, a water-reducing polycarboxylate high-performance water reducer 200g, sodium thiocyanate 10.0g, diethanolamine 2.5g, a defoaming agent 0.25g and water 237.25g, and uniformly stirring for later use;
2) The mixing amount of the concrete was 15L. 9.75kg of P, II 52.5 Portland cement, 3.75kg of sulphoaluminate cement, 1.5kg of silica fume, 18.75kg of quartz sand, 0.15kg of nano-silica, 1.18kg of steel fiber, 454.5g of admixture and 2.7kg of water are weighed for later use.
3) adding the Portland cement, the sulphoaluminate cement, the silica fume, the nano-silica and the quartz sand weighed in the step 2) into a stirring pot, stirring for 60s, then adding the weighed steel fibers while stirring, controlling the feeding time of the steel fibers to be 60s, and continuing to stir for 60s after the feeding is finished.
4) and adding the admixture prepared in the step 1) and the water weighed in the step 2) into the mixture obtained in the step 3), and stirring for 120s to obtain the steam-curing-free ultra-high performance concrete.
5) placing the prepared steam-curing-free ultrahigh-performance concrete in a concrete mould in a pouring mode, placing the concrete mould on a concrete vibrating table, vibrating for 10s, standing for 6h, and then placing the concrete mould in a standard curing room for curing.
Example 2
A preparation method of steam-curing-free ultrahigh-performance concrete comprises the following steps:
1) weighing and uniformly stirring 120g of early strength type polycarboxylate superplasticizer VIVID720P 120g, 180g of water-reducing type polycarboxylate high-performance water reducing agent, 18.0g of sodium thiocyanate, 6.0g of diethanol monoisopropanolamine, 0.3g of defoaming agent and 275.7g of water for later use.
2) P.O 52.5.5 kg of ordinary portland cement 11.25kg, sulphoaluminate cement 2.25kg, silica fume 0.75kg, quartz sand 16.5kg, nano-silica 0.375kg, steel fiber 2.36kg, admixture 511.9g and water 2.8kg are weighed for later use.
3) Adding the ordinary portland cement, the sulphoaluminate cement, the silica fume, the nano-silica and the quartz sand weighed in the step 2) into a stirring pot, stirring for 60s, then adding the steel fiber while stirring, controlling the feeding time of the steel fiber at 120s, and continuing to stir for 60s after the feeding is finished.
4) And adding 511.9g of the admixture prepared in the step 1) and the water weighed in the step 2) into the mixture prepared in the step 3), and stirring for 120s to prepare the steam-curing-free ultra-high performance concrete.
5) Placing the prepared steam-curing-free ultrahigh-performance concrete in a concrete mould in a pouring mode, placing the concrete mould on a concrete vibrating table, vibrating for 20s, standing for 6h, and then placing the concrete mould in a standard curing room for curing.
example 3
A preparation method of steam-curing-free ultrahigh-performance concrete comprises the following steps:
1) Weighing early strength type polycarboxylate superplasticizer VIVID720P 240g, water-reducing type polycarboxylate high-performance water reducer 60g, lithium sulfate 18.0g, diethanolamine 12.0g, defoaming agent 0.6g and water 257.4g, and uniformly stirring for later use.
2) P.O 42.5.5 kg of cement, 0.75kg of sulphoaluminate cement, 3.75kg of silica fume, 15kg of quartz sand, 0.75kg of nano-silica, 3.0kg of steel fiber, 585.0g of admixture and 2.75kg of water are weighed for later use.
3) adding the cement, the sulphoaluminate cement, the silica fume, the nano-silica and the quartz sand weighed in the step 2) into a stirring pot, stirring for 60s, then adding the steel fiber while stirring, controlling the feeding time of the steel fiber at 120s, and continuing to stir for 60s after the feeding is finished.
4) 585.0g of the admixture prepared in the step 1) and the water weighed in the step 2) are added into the powder, and the mixture is stirred for 120s, so that the steam-curing-free ultra-high performance concrete is prepared.
5) Placing the prepared concrete mixture in a concrete mould in a pouring mode, placing the concrete mixture on a concrete vibration table, vibrating for 20s, standing for 6h, and placing the concrete mixture in a standard curing room for curing.
comparative example 1
A preparation method of concrete comprises the following steps:
The concrete comprises the following raw materials by weight: 9.75kg of PII 52.5 cement, 3.75kg of P.O42.5 cement, 1.5kg of silica fume, 18.75kg of quartz sand, 0.15kg of fly ash, 1.18kg of steel fiber, 454.5g of common polycarboxylic acid water reducing agent and 2.7kg of water.
Compared with the example 1, the admixture uses a common polycarboxylic acid water reducing agent, the sulphoaluminate cement is changed into the common Portland cement P.O42.5, the nano-silica is changed into the fly ash, and other raw materials are the same as the example 1.
The molding procedure was the same as in example 1, except that the curing method was: standing for 6h, performing steam curing, heating to 70 deg.C at a temperature not higher than 12 deg.C/h, maintaining at constant temperature (70 + -5 deg.C) for 48h, cooling to a temperature not higher than 15 deg.C/h until the difference between the surface temperature of the member and the ambient temperature is not higher than 20 deg.C, and performing standard curing after curing.
Comparative example 2
The concrete comprises the following raw materials by weight: 11.25kg of P.O52.5 cement, 2.25kg of P.O42.5 cement, 0.75kg of silica fume, 16.5kg of quartz sand, 0.375kg of fly ash, 2.36kg of steel fiber, 511.9g of common polycarboxylic acid water reducing agent and 2.8kg of water for later use.
compared with the example 2, the admixture uses common polycarboxylic acid water reducing agent, the sulphoaluminate cement is changed into the common Portland cement P.O42.5, the nano-silica is changed into the fly ash, and other raw materials are the same as the example 1.
The molding procedure was the same as in example 2, except that the curing method was: standing for 6h, performing steam curing, heating to 70 deg.C at a temperature not higher than 12 deg.C/h, maintaining at constant temperature (70 + -5 deg.C) for 48h, cooling to a temperature not higher than 15 deg.C/h until the difference between the surface temperature of the member and the ambient temperature is not higher than 20 deg.C, and performing standard curing after curing.
Comparative example 3
A preparation method of concrete comprises the following steps:
the concrete comprises the following raw materials by weight:
13.5kg of P.O42.5 cement, 0.375kg of silica fume, 15kg of quartz sand, 0.75kg of fly ash, 3.0kg of steel fiber, 585.0g of common polycarboxylic acid water reducing agent and 2.75kg of water.
Compared with the embodiment 3, the admixture uses a common polycarboxylic acid water reducing agent, does not use sulphoaluminate cement, and the nano silicon dioxide is changed into fly ash.
The molding procedure was the same as in example 2, except that the curing method was: standing for 6h, performing steam curing, heating to 70 deg.C at a temperature not higher than 12 deg.C/h, maintaining at constant temperature (70 + -5 deg.C) for 48h, cooling to a temperature not higher than 15 deg.C/h until the difference between the surface temperature of the member and the ambient temperature is not higher than 20 deg.C, and performing standard curing after curing.
Comparison of the effects:
In order to evaluate the performance of the steam-curing-free ultrahigh-performance concrete, concrete tests are carried out and the mechanical properties of the concrete are detected according to relevant regulations of GB/T31387-2015 reactive powder concrete, specifically, the compressive strength and the breaking strength are 3d and 28 d. The test results are shown in table 1:
TABLE 1 test results of concrete of examples 1-3 and comparative examples 1-3
Note: standard curing was used for examples 1, 2 and 3, and steam curing was used for comparative examples 1, 2 and 3.
as can be seen from Table 1, the ultrahigh-performance concrete prepared in examples 1 to 3 by the method of the present invention has 3d compressive strength and flexural strength equivalent to those of the steam cured ultrahigh-performance concrete under the steam curing-free condition, and 28d compressive strength and flexural strength higher than those of the steam cured ultrahigh-performance concrete. The invention has simple process, no need of steam heat source, low energy consumption and low cost, thereby having good market prospect.
The above description is only a preferred embodiment of the present invention and should not be taken as limiting the invention, and any modifications, equivalents and improvements made within the spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. the steam curing-free ultrahigh-performance concrete is characterized by comprising the following raw materials in parts by weight: 550-900 parts of Portland cement or ordinary Portland cement, 50-300 parts of sulphoaluminate cement, 50-300 parts of silica fume, 5-50 parts of nano silicon dioxide, 1000-1300 parts of quartz sand, 35-200 parts of steel fiber, 20-45 parts of additive and 180-220 parts of water.
2. The steam-curing-free ultrahigh-performance concrete as claimed in claim 1, wherein the additive comprises the following raw materials in parts by weight: 10-40 parts of early strength type polycarboxylate superplasticizer, 10-40 parts of water-reducing polycarboxylate high-performance water reducer, 0.5-5.0 parts of inorganic salt early strength agent, 0.1-2 parts of organic early strength agent, 0.03-0.1 part of defoaming agent and 25-50 parts of water.
3. The non-autoclaved ultra-high performance concrete according to claim 2, wherein the early strength type polycarboxylate superplasticizer is selected from MasterGlenium ACE8206 or VIVID 720P.
4. The non-autoclaved ultra-high performance concrete according to claim 2, wherein the inorganic salt type early strength agent is one or both of sodium thiocyanate and lithium sulfate.
5. The non-autoclaved ultra-high performance concrete according to claim 2, wherein the organic early strength agent is one or more of diethanolamine or diethanolisopropanolamine.
6. The non-autoclaved ultra-high performance concrete according to claim 1, wherein the portland cement or ordinary portland cement grade is 42.5 grade or 52.5 grade.
7. The non-autoclaved ultra-high performance concrete according to claim 1, wherein said sulfoaluminate cement is 42.5 grade.
8. The non-autoclaved ultra-high performance concrete according to claim 1, wherein the average particle size of said nano silica is 10-15 nm.
9. The non-autoclaved ultra-high performance concrete according to claim 1, wherein the particle size of the silica sand is 20-100 mesh.
10. The method for preparing the steam-curing-free ultrahigh-performance concrete as claimed in any one of claims 1 to 9, wherein the preparation method comprises the following steps:
1) Weighing an early strength type polycarboxylate superplasticizer, a water-reducing polycarboxylate high-performance water reducer, an inorganic salt early strength agent, an organic early strength agent, a defoaming agent and water according to the formula of the additive, and uniformly stirring for later use;
2) Uniformly stirring and mixing the Portland cement or the ordinary Portland cement, the sulphoaluminate cement, the nano-silica, the silica fume and the quartz sand according to the formula ratio, and then adding the steel fiber according to the formula ratio while stirring;
3) Adding the admixture prepared in the step 1) and water with the formula amount into the mixture prepared in the step 2), and stirring to prepare the steam-curing-free ultra-high performance concrete.
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| CN111205045A (en) * | 2020-01-13 | 2020-05-29 | 西南交通大学 | Special sprayed concrete material for tunnel high-ground-temperature dry-heat environment |
| CN112279591A (en) * | 2020-11-02 | 2021-01-29 | 佛山市东鹏陶瓷发展有限公司 | Cement-based concrete plate with high early strength and preparation method thereof |
| CN112341105A (en) * | 2020-10-30 | 2021-02-09 | 成都城投城建科技有限公司 | Flexible concrete wood-grain-like board suitable for park city and preparation method thereof |
| CN112759337A (en) * | 2021-03-09 | 2021-05-07 | 山东晟世达科技有限公司 | Active powder concrete with high-content solid waste and preparation and use method thereof |
| CN112876180A (en) * | 2021-03-09 | 2021-06-01 | 山东晟世达科技有限公司 | Rapid hardening cementing material and preparation method and application thereof |
| CN113402210A (en) * | 2021-07-03 | 2021-09-17 | 河北宏京新型建材有限公司 | Ultrahigh-performance concrete and preparation method thereof |
| CN115611565A (en) * | 2022-09-07 | 2023-01-17 | 云南筑辉建材有限公司 | Formula and preparation method of novel nano composite material UHPC |
| CN115819052A (en) * | 2022-12-12 | 2023-03-21 | 中南大学 | Ultrahigh early strength ultrahigh performance concrete and preparation method thereof |
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| CN112876180A (en) * | 2021-03-09 | 2021-06-01 | 山东晟世达科技有限公司 | Rapid hardening cementing material and preparation method and application thereof |
| CN113402210A (en) * | 2021-07-03 | 2021-09-17 | 河北宏京新型建材有限公司 | Ultrahigh-performance concrete and preparation method thereof |
| CN115611565A (en) * | 2022-09-07 | 2023-01-17 | 云南筑辉建材有限公司 | Formula and preparation method of novel nano composite material UHPC |
| CN115819052A (en) * | 2022-12-12 | 2023-03-21 | 中南大学 | Ultrahigh early strength ultrahigh performance concrete and preparation method thereof |
| CN116120008A (en) * | 2022-12-29 | 2023-05-16 | 北京住总建筑科技有限公司 | Steam curing-free precast concrete and preparation method thereof |
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Application publication date: 20191213 |
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