CN110627461B - Ultrahigh-performance concrete applied to high-cold area and preparation method thereof - Google Patents
Ultrahigh-performance concrete applied to high-cold area 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/76—Use at unusual temperatures, e.g. sub-zero
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Abstract
The invention provides an ultrahigh-performance concrete applied to a high and cold area and a preparation method thereof, wherein the ultrahigh-performance concrete comprises the following raw materials in parts by weight: 650 parts of Portland cement, 450 parts of high-aluminate cement, 200 parts of silica fume, 50-100 parts of silica fume, 5-50 parts of nano silicon dioxide, 1300 parts of sand, 35-200 parts of steel fiber, 20-45 parts of water reducing agent, 2-10 parts of antifreezing agent, 0.2-2.0 parts of early strength agent and 210 parts of water 180. Compared with the prior art, the ultra-high performance concrete for the high and cold area can be constructed in the high and cold area at the temperature of minus 20 ℃, and the strength can be rapidly obtained. And moreover, the compactness is high, and the chlorine ion penetration resistance and the mechanical property are excellent.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to an ultrahigh-performance concrete applied to a high-cold region 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, at present, no report of using the ultra-high performance concrete in a high and cold area at the temperature of-20 ℃ is found, which is mainly because the hydration speed of the concrete is rapidly reduced, the strength is slowly increased, and even the increase is stopped under the low-temperature condition. The frozen and expanded crystal water in the concrete damages the microstructure of the concrete under the condition of low temperature, so that the microstructure of the concrete loses strength and the service life of the concrete is seriously influenced. The application of ultra-high concrete is restricted by the cold regions at low temperature.
Disclosure of Invention
The invention aims to provide the ultra-high performance concrete applied to the high and cold regions, which can be constructed in the high and cold regions at the temperature of-20 ℃, has excellent mechanical property, good chlorine ion permeability resistance and can quickly obtain the strength.
The invention also aims to provide a preparation method of the ultra-high performance concrete applied to the high and cold regions, which is simple and has wide market prospect.
The specific technical scheme of the invention is as follows:
the ultra-high performance concrete applied to the alpine region comprises the following raw materials in parts by weight:
650 parts of Portland cement, 450 parts of high-aluminate cement, 200 parts of silica fume, 50-100 parts of silica fume, 5-50 parts of nano silicon dioxide, 1300 parts of sand, 35-200 parts of steel fiber, 20-45 parts of water reducing agent, 2-10 parts of antifreezing agent, 0.2-2.0 parts of early strength agent and 210 parts of water 180.
The water reducing agent is prepared from the following raw materials in percentage by mass: early strength type polycarboxylic acid water reducing agent: the water-reducing polycarboxylic acid high-performance water reducing agent comprises the following components: melamine water reducing agents: defoaming agent: 15-40 parts of water: 10-40: 5-15: 0.01-0.15: 20-60.
Further, the early strength type polycarboxylate superplasticizer is selected from one or two of MasterGlenium ACE 8206 or Shanghai Sanrui VIVID 720P.
The water reducing rate of the water reducing type polycarboxylic acid high-performance water reducing agent is not less than 32%.
The water reducing rate of the melamine water reducing agent is not less than 14%.
The defoaming agent is an organic silicon defoaming agent or a polyether defoaming agent.
Preferably, the portland cement is one of P.I 52.5 grade or P.II 52.5 grade.
The high aluminate cement is 52.5 grade or 62.5 grade.
Of said silica fumeSiO2The 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 sand is one or two of natural sand, quartz sand or machine-made sand, and the grain diameter of the sand is 0.25-2.36 mm.
The length of the steel fiber is 12-25mm, and the diameter is 0.16-0.22 mm.
The antifreezing agent is one or two of sodium nitrite, sodium nitrate or calcium nitrate.
The early strength agent is one or two of sodium silicate or sodium thiocyanate.
The preparation method of the ultra-high performance concrete applied to the alpine region provided by the invention comprises the following steps:
1) uniformly stirring an early strength type polycarboxylate superplasticizer, a water-reducing type polycarboxylate high-performance water reducer, a melamine water reducer, a defoaming agent and water according to a weight ratio for later use;
2) weighing silicate cement, high aluminate cement, silica fume, nano silicon dioxide, sand, an antifreezing agent and an early strength agent according to a proportion, uniformly stirring, and then adding steel fibers while stirring;
3) adding the water reducer prepared in the step 1) and water with the formula amount into the mixture obtained in the step 2), and stirring to obtain the ultra-high performance concrete applied to the alpine region.
Further, in the step 2), weighing portland cement, high aluminate cement, silica fume, nano-silica, sand, an antifreezing agent and an early strength agent according to a proportion, placing the materials into a stirrer, and stirring for 60s to mix uniformly;
preferably, in the step 2), the feeding time of the steel fibers is controlled to be 60-120 s;
preferably, in step 2), the addition of steel fibers is ended and stirring is continued for 60 s.
In the step 3), the stirring refers to stirring for 60-120 s.
Further, the prepared ultra-high performance concrete applied to the alpine region is placed in a concrete mould in a pouring mode, placed on a concrete vibrating table, vibrated for 10-20s, kept stand for 6h at room temperature, and moved into an environment at the temperature of-20 ℃ for curing. Then, detection is performed.
The invention has the following functions of raw materials:
high aluminate 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.
Silica fume: the silica fume is small in particle size, can be fully filled among cement particles, improves the compactness of the hardened concrete, has the volcanic ash activity, and can effectively improve the concrete compactness.
Steel fiber: can effectively improve the compression strength and the breaking strength of the ultra-high performance concrete.
An antifreezing agent: can effectively reduce the freezing point of the concrete and greatly improve the frost resistance of the concrete under the condition of negative temperature.
Early strength agent: can quickly promote the hydration of cement and improve the early strength of 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.
Melamine water reducing agents: the water reducing agent is a non-air-entraining water reducing agent, reduces the content of air bubbles in the concrete and improves the compactness of the concrete.
The water-reducing polycarboxylic acid high-performance water reducing agent comprises the following components: has high water reducing rate and slump retaining performance.
Defoaming agent: eliminate harmful air bubbles in the concrete, improve the compactness of the concrete and increase the strength of the concrete.
Compared with the prior art, the ultra-high performance concrete for the high and cold area can be constructed in the high and cold area at the temperature of minus 20 ℃, and the strength can be rapidly obtained. And moreover, the compactness is high, and the chlorine ion penetration resistance and the mechanical property are excellent.
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 ultra-high performance concrete applied to high and cold regions comprises the following steps:
1) 200g of early strength type polycarboxylate superplasticizer, 50g of water-reducing polycarboxylate high-performance water reducer, 50g of melamine water reducer, 0.15g of defoaming agent and 199.85g of water are weighed, and the materials are uniformly stirred to serve as the water reducer for later use.
2) The mixing amount of the concrete was 15L. Weighing 52.5-grade 9.75kg of Portland cement P.I, 52.5-grade 3.45kg of high-aluminate cement, 0.75kg of silica fume, 0.15kg of nano silicon dioxide, 18.75kg of sand, 0.525kg of steel fiber, 0.42kg of water reducing agent prepared in the step 1), 0.075kg of sodium nitrite, 0.03kg of sodium silicate and 2.775kg of water for later use.
3) Adding the Portland cement, the high-aluminate cement, the silica fume, the nano-silica, the sand, the sodium nitrite and the sodium silicate 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) Adding the water reducer 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 ultra-high performance concrete applied to the alpine region.
5) Placing the prepared concrete in a concrete mould in a pouring mode, placing the concrete on a concrete vibration table, vibrating for 10s, standing for 6h, and moving the concrete to the environment of-20 ℃ for curing.
Example 2
A preparation method of ultra-high performance concrete applied to high and cold regions comprises the following steps:
1) weighing 210g of early strength type polycarboxylate superplasticizer, 140g of water-reducing polycarboxylate high-performance water reducer, 105g of melamine water reducer, 0.35g of defoaming agent and 244.65g of water, and uniformly stirring to obtain the water reducer for later use.
2) The mixing amount of the concrete was 15L. Weighing 52.5-grade 8.25kg of Portland cement P, II, 52.5-grade 5.1kg of high-aluminate cement, 1.05kg of silica fume, 0.675kg of nano silicon dioxide, 16.5kg of sand, 1.18kg of steel fiber, 0.6kg of water reducing agent prepared in the step 1), 0.135kg of sodium nitrite, 0.015kg of sodium silicate, 0.0075kg of sodium thiocyanate and 2.85kg of water for later use.
3) Adding the Portland cement, the high-aluminate cement, the silica fume, the nano-silica, the sand, the sodium nitrite, the sodium silicate and the sodium thiocyanate which are weighed in the step 2) into a stirring pot, stirring for 60s, then adding the steel fibers weighed in the step 2) while stirring, controlling the feeding time of the steel fibers to be 60s, and continuing stirring for 60s after the feeding is finished.
4) And adding the water reducing agent 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 ultra-high performance concrete applied to the alpine region.
5) Placing the prepared concrete in a concrete mould in a pouring mode, placing the concrete on a concrete vibration table, vibrating for 10s, standing for 6h, and moving the concrete to the environment of-20 ℃ for curing.
Example 3
A preparation method of ultra-high performance concrete applied to high and cold regions comprises the following steps:
1) weighing 80g of early strength type polycarboxylate superplasticizer, 140g of water-reducing polycarboxylate high-performance water reducer, 20g of melamine water reducer, 0.32g of defoaming agent and 159.68g of water, and uniformly stirring to obtain a water reducer for later use;
2) the mixing amount of the concrete was 15L. 52.5-grade 6.975kg of Portland cement P, II, 62.5-grade 6.525kg of high aluminate cement, 1.0kg of silica fume, 0.3kg of nano silicon dioxide, 17.25kg of sand, 2.355kg of steel fiber, 0.375kg of water reducing agent prepared in the step 1), 0.045kg of sodium nitrate, 0.03kg of sodium thiocyanate and 2.7kg of water are weighed for later use.
3) Adding the Portland cement, the high-aluminate cement, the silica fume, the nano-silica, the sand, the sodium nitrate and the sodium thiocyanate which are weighed in the step 2) into a stirring pot, stirring for 60s, then adding the steel fibers weighed in the step 2) while stirring, controlling the feeding time of the steel fibers to be 60s, and continuing stirring for 60s after the feeding is finished.
4) Adding the water reducer 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 ultra-high performance concrete applied to the alpine region.
5) Placing the prepared concrete in a concrete mould in a pouring mode, placing the concrete on a concrete vibration table, vibrating for 10s, standing for 6h, and moving the concrete to the environment of 20 ℃ below zero for curing.
Comparative example 1
A preparation method of concrete comprises the following steps:
1) and the mixing amount of the concrete is 15L, and 52.5-grade 13.2kg of Portland cement P.I, 0.9kg of silica fume, 18.75kg of sand, 0.525kg of steel fiber, 0.42kg of water reducing agent (common polycarboxylic acid water reducing agent) and 2.775kg of water are weighed for later use.
2) Adding the weighed Portland cement, silica fume and sand into a stirring pot, stirring for 60s, then adding the steel fiber while stirring, controlling the feeding time of the steel fiber at 60s, and continuing to stir for 60s after the feeding is finished.
3) And adding the water reducer weighed in the step 1) and water into the mixture in the step 2), and stirring for 120s to obtain the concrete mixture.
4) Placing the prepared concrete mixture in a concrete mould in a pouring mode, placing the concrete mixture on a concrete vibration table, vibrating for 10s, standing for 6h, and moving the concrete mixture to a-20 ℃ environment for curing.
Comparative example 2
A preparation method of concrete comprises the following steps:
1) the mixing amount of the concrete was 15L. 52.5-grade 13.35kg of Portland cement P, II, 1.725kg of silica fume, 16.5kg of sand, 1.18kg of steel fiber, 0.6kg of water reducing agent (common polycarboxylic acid water reducing agent) and 2.85kg of water are weighed for later use.
2) Adding the weighed Portland cement, silica fume and sand into a stirring pot, stirring for 60s, then adding the steel fiber while stirring, controlling the feeding time of the steel fiber at 60s, and continuing to stir for 60s after the feeding is finished.
3) And adding the water reducer weighed in the step 1) and water into the mixture obtained in the step 2), and stirring for 120s to obtain the concrete mixture.
4) Placing the prepared concrete mixture in a concrete mould in a pouring mode, placing the concrete mixture on a concrete vibration table, vibrating for 10s, standing for 6h, and moving the concrete mixture to a-20 ℃ environment for curing.
Comparative example 3
A preparation method of concrete comprises the following steps:
1) the mixing amount of the concrete was 15L. Weighing Portland cement P, II 52.513.5 kg, silica fume 0.75kg, sand 17.25kg, steel fiber 2.355kg, water reducing agent (common polycarboxylic acid water reducing agent) 0.375kg, and water 2.7kg for later use.
2) Adding the weighed Portland cement, silica fume and sand into a stirring pot, stirring for 60s, then adding the steel fiber while stirring, controlling the feeding time of the steel fiber at 60s, and continuing to stir for 60s after the feeding is finished.
3) And adding the water reducer weighed in the step 1) and water into the mixture obtained in the step 2), and stirring for 120s to obtain the concrete mixture.
4) Placing the prepared concrete mixture in a concrete mould in a pouring mode, placing the concrete mixture on a concrete vibration table, vibrating for 10s, standing for 6h, and moving the concrete mixture to a-20 ℃ environment for curing.
The environmental factors and curing conditions were the same in the production processes of examples 1 to 3 and comparative examples 1 to 3.
Comparison of the effects:
in order to evaluate the performance of the ultra-high performance concrete in the alpine region, the mechanical properties of the concrete are detected according to relevant regulations of GB/T31387-2015 active powder concrete; the concrete prepared in examples 1-3 and comparative examples 1-3 is tested for crack resistance and chloride ion penetration resistance by referring to GB/T50082-2009 test method Standard for Long-term Performance and durability of ordinary concrete. The test results are shown in table 1:
TABLE 1 comparison of the Properties of the concretes prepared in examples 1-3 and comparative examples 1-3
Note: and testing the test block for the chloride ion permeability resistance, standing for 6 hours after molding, and moving to the environment of-20 ℃ for curing.
As can be seen from Table 1, the compressive strength of the common ultra-high performance concrete formula is greatly reduced at the temperature of-20 ℃, and satisfactory mechanical properties are difficult to obtain.
The foregoing is considered as illustrative only of the preferred embodiments of the invention, and is not to be taken as limiting the invention as any modifications, equivalents, improvements, etc. that come within the spirit of the invention.
Claims (8)
1. The ultra-high performance concrete applied to the alpine region is characterized by comprising the following raw materials in parts by weight:
650 parts of Portland cement, 450 parts of high-aluminate cement, 200 parts of silica fume, 50-100 parts of silica fume, 5-50 parts of nano silicon dioxide, 1300 parts of sand, 35-200 parts of steel fiber, 20-45 parts of water reducing agent, 2-10 parts of antifreezing agent, 0.2-2.0 parts of early strength agent and 210 parts of water 180;
the water reducing agent is prepared from the following raw materials in percentage by mass: early strength type polycarboxylic acid water reducing agent: the water-reducing polycarboxylic acid high-performance water reducing agent comprises the following components: melamine water reducing agents: defoaming agent: 15-40 parts of water: 10-40: 5-15: 0.01-0.15: 20-60 parts of;
the portland cement is P.I 52.5 grade or P.II 52.5 grade.
2. The ultra-high performance concrete applied to alpine regions according to claim 1, wherein the early strength polycarboxylate superplasticizer is selected from one or two of MasterGlenium ACE 8206 or VIVID 720P.
3. The ultra-high performance concrete for alpine regions according to claim 1, wherein the water reducing rate of the water reducing type polycarboxylic acid high performance water reducing agent is not less than 32%.
4. The concrete applied to the ultra-high performance concrete in the alpine region according to claim 1, wherein the water reducing rate of the melamine water reducing agent is not less than 14%.
5. The ultra-high performance concrete for alpine regions according to claim 2, wherein the defoaming agent is a silicone type defoaming agent or a polyether type defoaming agent.
6. The ultra-high performance concrete applied to the alpine region according to claim 1 or 2, wherein the high aluminate cement is one of 52.5 grade or 62.5 grade.
7. The ultra-high performance concrete for alpine regions according to claim 1 or 2, wherein the anti-freezing agent is one or two of sodium nitrite, sodium nitrate and calcium nitrate.
8. The preparation method of the ultra-high performance concrete applied to the alpine region according to any one of claims 1 to 7, wherein the preparation method comprises the following steps:
1) uniformly stirring an early strength type polycarboxylate superplasticizer, a water-reducing type polycarboxylate high-performance water reducer, a melamine water reducer, a defoaming agent and water according to a weight ratio for later use;
2) weighing silicate cement, high aluminate cement, silica fume, nano silicon dioxide, sand, an antifreezing agent and an early strength agent according to a proportion, uniformly stirring, and then adding steel fibers while stirring;
3) adding the water reducer prepared in the step 1) and water with the formula amount into the mixture obtained in the step 2), and stirring to obtain the ultra-high performance concrete applied to the alpine region.
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| CN113061003B (en) * | 2021-04-19 | 2022-07-26 | 北京市市政工程研究院 | Low-temperature ultra-high-performance concrete and preparation method and application thereof |
| CN113321476B (en) * | 2021-05-25 | 2023-04-18 | 柳州欧维姆结构检测技术有限公司 | Early-strength type ultrahigh-performance concrete capable of being constructed at negative temperature and preparation method thereof |
| CN116514488A (en) * | 2023-05-05 | 2023-08-01 | 山东高速股份有限公司 | Early strength high toughness ultra-high performance concrete and preparation method and application thereof |
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