CN111704432A - Rapid rush-repair high-performance self-compacting concrete and preparation method and application thereof - Google Patents
Rapid rush-repair high-performance self-compacting concrete and preparation method and application thereof Download PDFInfo
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- CN111704432A CN111704432A CN202010570288.1A CN202010570288A CN111704432A CN 111704432 A CN111704432 A CN 111704432A CN 202010570288 A CN202010570288 A CN 202010570288A CN 111704432 A CN111704432 A CN 111704432A
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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
- C04B28/14—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 calcium sulfate cements
- C04B28/16—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 calcium sulfate cements containing anhydrite, e.g. Keene's cement
-
- 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
- C04B2111/72—Repairing or restoring existing buildings or building materials
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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
Abstract
The invention discloses a high-performance self-compacting concrete for rapid rush repair and a preparation method and application thereof, belonging to the field of concrete materials.
Description
Technical Field
The invention belongs to the technical field of concrete materials, and particularly relates to a high-performance self-compacting concrete for rapid rush repair, and a preparation method and application thereof.
Background
With the acceleration of the development of bridge traffic industry in China and the continuous improvement of bridge construction technology, the bridge expansion device becomes an important component of a bridge. The bridge expansion device is suitable for the contraction of the bridge caused by temperature stress, so that the vehicle runs comfortably. The notch concrete of the bridge expansion device bears repeated temperature load, vehicle impact load and vehicle tire frictional resistance for a long time, and the notch concrete of the bridge expansion device is extremely easy to damage, so that the damage of the bridge expansion device is caused. And the time of construction is left short in the bridge telescoping device replacement process, so special high-performance self-compacting concrete needs to be developed aiming at the special use working condition and limited construction time of the bridge telescoping device notch concrete and a narrow construction space.
At present, the concrete materials which can be used under the conditions of narrow space and dynamic load are mainly steel fiber concrete and quick repair mortar. Both materials suffer from significant disadvantages and drawbacks. The steel fiber concrete has the characteristics of slow strength development (long traffic recovery time), easy shrinkage and poor bonding strength, and is not suitable for replacement construction of bridge expansion devices of expressways and urban expressways; the quick repair mortar belongs to mortar products, does not have higher fracture resistance, impact resistance and cleavage resistance, has lower elastic modulus, durability and the like, is easy to crack, and is not suitable for being used as a structural material; steel fiber concrete and quick repair mortar are used as bridge expansion device notch concrete, and are usually damaged in a short time after being repaired and repeatedly repaired.
Therefore, a fast repairing concrete material with super early strength, no shrinkage, high wear resistance, high adhesion, high toughness, high impact resistance, high durability and self-compaction is urgently needed.
Disclosure of Invention
The invention aims to provide a high-performance self-compacting concrete for rapid rush repair and a preparation method and application thereof, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the high-performance self-compacting concrete for rapid repair comprises the following components in per cubic meter by weight:
preferably, the time for the concrete to reach the strength of 30MPa is 2-5 h.
Preferably, the particle size of the coarse aggregate is 3-16 mm, and the particle size of the fine aggregate is less than 5 mm.
Preferably, the water content of the special cement, the stone powder, the gypsum, the coarse aggregate, the fine aggregate, the polymer admixture and the functional auxiliary agent is less than 1.0 percent.
Preferably, the coarse aggregate includes any one of reformed basalt, diabase, natural crushed stone and natural soft stone.
Preferably, the fine aggregate comprises any one or more of natural sand, artificial sand and industrial slag.
In addition, the invention also provides a preparation method of the rapid first-aid repair high-performance self-compacting concrete, which comprises the following steps:
s1, selecting 400-550 kg of special cement, 100-200 kg of cement, 50-100 kg of mineral powder, 100-200 kg of gypsum, 750-1000 kg of coarse aggregate, 700-1000 kg of fine aggregate, 1-25 kg of polycarboxylic acid concrete water reducer and 0-5 kg of VAE emulsion according to the configuration of each cubic meter of concrete;
s2, placing the selected raw materials in a dry powder mortar mixing system, and stirring for 3-6 min to form a homogeneous concrete finished product;
and S3, packaging the concrete finished product by a packaging machine to finish packaging.
The high-performance self-compacting concrete for rapid rush repair is used as bridge expansion joint concrete, section thickening concrete or concrete under the conditions of narrow space and dynamic load.
The high-performance self-compacting concrete for rapid rush repair has the characteristics of super early strength, no shrinkage, high wear resistance, high bonding, high toughness, high impact resistance, high durability and high workability, and effectively fills the blank of the original material industry of concrete.
Detailed Description
The present invention will be further described with reference to the following examples.
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. The conditions in the embodiments can be further adjusted according to specific conditions, and simple modifications of the method of the present invention based on the concept of the present invention are within the scope of the claimed invention.
A high-performance self-compacting concrete for quick first-aid repair is prepared from special cement, powdered coal ash, powdered ore, gypsum, coarse aggregate, fine aggregate, polymer additive and functional assistant. The concrete comprises the following components in percentage by weight per cubic concrete: 400-550 kg of special cement, 100-200 kg of cement, 50-100 kg of mineral powder, 100-200 kg of gypsum, 750-1000 kg of coarse aggregate, 700-1000 kg of fine aggregate, 1-25 kg of polycarboxylic acid concrete water reducer and 0-5 kg of VAE emulsion; wherein the cement is 42.5-grade ordinary portland cement or 52.5-grade ordinary portland cement; the special cement comprises sulphoaluminate cement or high alumina cement. According to the local resource condition, the coarse aggregate can be independently used as crushed stone or natural pebble, and can also be simultaneously used as basalt or diabase crushed stone and natural pebble. The particle size of the coarse aggregate is 3-16 mm. The fine aggregate may be natural sand, artificial sand or industrial slag, or natural sand, artificial sand or industrial slag may be used together, depending on the local resource conditions. The industrial slag can be water-quenched blast furnace slag, phosphorus slag and the like. The particle size of the fine aggregate is less than 5 mm.
According to the local resource condition, the compensation shrinkage is mainly achieved by adjusting the proportion of cement, gypsum and special cement to achieve the best compensation shrinkage performance. Generally, the hydration process of cement mainly has a dissolution mechanism and a solid-phase reaction mechanism. In the dissolution mechanism stage: as the hydration process progresses, more and more hydration products are generated and are mutually staggered to form a network structure, so that the cement is finally coagulated to form strength, and the hydration products are formed in the solid phase reaction mechanism stage, and the hydration products continuously fill the pores in the network structure, so that the porosity is reduced, and the compactness is increased. According to the local resource condition, the polymer admixture can be used independently or simultaneously as a polycarboxylic acid concrete water reducing agent. The polycarboxylic acid concrete water reducing agent has the function of enhancing the fluidity of the concrete material and the binding power with the original concrete and the reinforcing steel bar.
Example 1
A fast first-aid repair high-performance self-compacting concrete is prepared by the following steps:
TABLE 1 raw material ratio (unit: kg/m3)
Raw material components of a formula are selected according to the table 1, wherein the cement is 52.5-grade ordinary portland cement, the special cement is high-strength special cement, the gypsum is anhydrous gypsum, the mineral powder is II-grade, the modulus of a fine aggregate is 2.7mm, the particle size of a coarse aggregate is 3-16 mm, a polycarboxylic acid concrete water reducer and VAE emulsion. Selecting the raw materials according to the composition and the dosage according to the mixing ratio, then stirring for 3-6 min by using a dry powder mortar mixing system to form a homogeneous finished product, and forming a bagged final product by using a packaging machine. When the concrete is used, 5-15% of water in dry materials is added, the water and the dry materials are uniformly stirred by a special stirrer to form finished concrete, and the finished concrete is poured and pounded to a required occasion scene by a self-weight method or a pumping method to complete the functions and performances of the scene required by the special high-performance concrete.
The strength grade of the concrete was C60.
Example 2
TABLE 2 raw material ratio (unit: kg/m)3)
Raw material components of the formula are selected according to the table 2, wherein the cement is 42.5-grade ordinary portland cement, the special cement is high-strength special cement, the gypsum is anhydrous gypsum, the mineral powder is II-grade, the modulus of fine aggregate is 2.7mm, the particle size of coarse aggregate is 3-16 mm, the polycarboxylic acid concrete water reducer, the VAE emulsion can be dispersed in latex powder and the like. Selecting the raw materials according to the composition and the dosage according to the mixing ratio, then stirring for 3-6 min by using a dry powder mortar mixing system to form a homogeneous finished product, and forming a bagged final product by using a packaging machine. When the concrete is used, 5-15% of water in dry materials is added, the water and the dry materials are uniformly stirred by a special stirrer to form finished concrete, and the finished concrete is poured and pounded to a required occasion scene by a self-weight method or a pumping method to complete the functions and performances of the scene required by the special high-performance concrete.
The strength of the concrete was C50.
Example 3
TABLE 3 raw material ratio (unit: kg/m)3)
Raw material components of a formula are selected according to the table 3, wherein the cement is 42.5-grade ordinary portland cement, the special cement is 42.5 special cement, the gypsum is anhydrous gypsum, the mineral powder is II-grade, the modulus of fine aggregate is 2.8mm, the particle size of coarse aggregate is 3-16 mm, the polycarboxylic acid concrete water reducer, the VAE emulsion can be dispersed in latex powder and the like. Selecting the raw materials according to the composition and the dosage according to the mixing ratio, then stirring for 3-6 min by using a dry powder mortar mixing system to form a homogeneous finished product, and forming a bagged final product by using a packaging machine. When the concrete is used, 5-15% of water in dry materials is added, the water and the dry materials are uniformly stirred by a special stirrer to form finished concrete, and the finished concrete is poured and pounded to a required occasion scene by a self-weight method or a pumping method to complete the functions and performances of the scene required by the special high-performance concrete.
TABLE 4 technical indexes of rapid repair of high-performance self-compacting concrete
As can be seen from Table 4, compared with the traditional concrete material, the early strength agent and the repair mortar have more excellent fluidity, the concrete material can be stirred by adding water on site, vibration is avoided, the construction is convenient, and the concrete material can be used for the rapid rush repair of the bridge expansion joint; highway, expansion joint of city elevated road, road surface; rapid repair of airport runways and the like.
Compared with other traditional materials, the invention has the advantages of simple process, stable performance, good durability and low cost.
Super early strength: by adjusting the proportion of cement, special cement and gypsum, adjusting the addition amount of retarder and accelerator, adjusting the construction time of the product and ensuring that the product reaches the design strength within 2-5 hours;
high wear resistance: reasonable cement, special cement, gypsum additive, fly ash and redispersible latex powder are added, so that the compactness of the product is improved, and meanwhile, the stone for the asphalt pavement is adopted to further improve the wear resistance of the product;
high durability: reasonable cement, special cement, gypsum, fly ash and addition of the redispersible latex powder improve the compactness of the product, thereby finally improving the long-term performances of the product such as water resistance, freeze-thaw resistance and the like;
high adhesion: the reasonable cement, special cement, gypsum and fly ash enable the cementing material to fully react, so that the binding power between the cementing material and the base layer is enhanced; meanwhile, by adding the organic and inorganic bonding materials of the redispersible latex powder for composite use, the bonding force and the cohesive force between the product and the base layer are further improved.
No shrinkage: the optimal proportion of the cement, the special cement, the gypsum and the fly ash avoids the drying shrinkage of the product in the initial stage of the cement reaction, and ensures the micro-expansion of the later reaction, thereby avoiding the later shrinkage of the whole system and avoiding the cracking.
Initial cracking resistance: the addition of the fiber improves the initial cracking resistance of the product;
therefore, the invention is particularly suitable for the rapid repair of the bridge expansion joint, the thickening of the section and the rapid repair construction under the conditions of narrow space and dynamic load.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a rapid repair high performance self-compaction concrete which characterized in that: the concrete comprises the following components in parts by weight per cubic meter:
2. the fast-repairing high-performance self-compacting concrete according to claim 1, wherein the time for the concrete to reach the strength of 30MPa is 2-5 h.
3. The fast-repairing high-performance self-compacting concrete according to claim 2, wherein the particle size of the coarse aggregate is 3-16 mm, and the particle size of the fine aggregate is less than 5 mm.
4. The rapid repair high-performance self-compacting concrete according to claim 2, wherein the water content of the special cement, the stone powder, the gypsum, the coarse aggregate, the fine aggregate, the polymer admixture and the functional auxiliary agent is less than 1.0%.
5. The rapid repair high performance self-compacting concrete according to claim 3, wherein the coarse aggregate comprises any one of reshaped basalt, diabase, natural crushed stone and natural soft stone.
6. The rapid repair high performance self-compacting concrete according to claim 3, wherein the fine aggregate comprises any one or more of natural sand, artificial sand and industrial slag.
7. A preparation method of a high-performance self-compacting concrete for rapid rush repair is characterized by comprising the following steps of:
s1, selecting 400-550 kg of special cement, 100-200 kg of cement, 50-100 kg of mineral powder, 100-200 kg of gypsum, 750-1000 kg of coarse aggregate, 700-1000 kg of fine aggregate, 1-25 kg of polycarboxylic acid concrete water reducer and 0-5 kg of VAE emulsion according to the configuration of each cubic meter of concrete;
s2, placing the selected raw materials in a dry powder mortar mixing system, and stirring for 3-6 min to form a homogeneous concrete finished product;
and S3, packaging the concrete finished product by a packaging machine to finish packaging.
8. The utility model provides an application of rapid repair high performance self-compaction concrete, its characterized in that, the application includes with any one of claim 1 ~ 6 rapid repair high performance self-compaction concrete be used as bridge expansion joint concrete, section thickening concrete or concrete under the narrow and small, dynamic load condition in space.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010570288.1A CN111704432A (en) | 2020-06-22 | 2020-06-22 | Rapid rush-repair high-performance self-compacting concrete and preparation method and application thereof |
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| CN202010570288.1A CN111704432A (en) | 2020-06-22 | 2020-06-22 | Rapid rush-repair high-performance self-compacting concrete and preparation method and application thereof |
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Citations (7)
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| CN101445342A (en) * | 2008-11-24 | 2009-06-03 | 上海美创建筑材料有限公司 | Concrete material for reinforcing high-performance structure project, preparation method and use thereof |
| ES2391959A1 (en) * | 2011-05-06 | 2012-12-03 | Iñaki ZABALA ZUAZO | Self compacting concrete. (Machine-translation by Google Translate, not legally binding) |
| CN104478371A (en) * | 2014-11-12 | 2015-04-01 | 湖南省建筑工程集团总公司 | Energy-saving type concrete crack repairing agent |
| CN107117918A (en) * | 2016-02-25 | 2017-09-01 | 张彬 | A kind of quick setting and rapid hardening ungauged regions disturbance rejection self-compacting concrete and preparation method thereof |
| CN107572981A (en) * | 2017-10-25 | 2018-01-12 | 安徽中铁工程材料科技有限公司 | A kind of concrete repair self-compacting concrete and preparation method thereof |
| CN109851304A (en) * | 2019-03-06 | 2019-06-07 | 唐山北极熊建材有限公司 | Repairing material for concrete pavement and its preparation method and application |
| CN110668767A (en) * | 2019-09-12 | 2020-01-10 | 中铁第四勘察设计院集团有限公司 | Polymer concrete for quickly repairing wide and narrow joints of slab ballastless track and preparation method thereof |
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2020
- 2020-06-22 CN CN202010570288.1A patent/CN111704432A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101445342A (en) * | 2008-11-24 | 2009-06-03 | 上海美创建筑材料有限公司 | Concrete material for reinforcing high-performance structure project, preparation method and use thereof |
| ES2391959A1 (en) * | 2011-05-06 | 2012-12-03 | Iñaki ZABALA ZUAZO | Self compacting concrete. (Machine-translation by Google Translate, not legally binding) |
| CN104478371A (en) * | 2014-11-12 | 2015-04-01 | 湖南省建筑工程集团总公司 | Energy-saving type concrete crack repairing agent |
| CN107117918A (en) * | 2016-02-25 | 2017-09-01 | 张彬 | A kind of quick setting and rapid hardening ungauged regions disturbance rejection self-compacting concrete and preparation method thereof |
| CN107572981A (en) * | 2017-10-25 | 2018-01-12 | 安徽中铁工程材料科技有限公司 | A kind of concrete repair self-compacting concrete and preparation method thereof |
| CN109851304A (en) * | 2019-03-06 | 2019-06-07 | 唐山北极熊建材有限公司 | Repairing material for concrete pavement and its preparation method and application |
| CN110668767A (en) * | 2019-09-12 | 2020-01-10 | 中铁第四勘察设计院集团有限公司 | Polymer concrete for quickly repairing wide and narrow joints of slab ballastless track and preparation method thereof |
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Application publication date: 20200925 |
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