CN110563407A - Green environment-friendly high-strength self-compacting fair-faced concrete for bridge capping beam and preparation process thereof - Google Patents
Green environment-friendly high-strength self-compacting fair-faced concrete for bridge capping beam and preparation process thereof Download PDFInfo
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- CN110563407A CN110563407A CN201910938563.8A CN201910938563A CN110563407A CN 110563407 A CN110563407 A CN 110563407A CN 201910938563 A CN201910938563 A CN 201910938563A CN 110563407 A CN110563407 A CN 110563407A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/38—Treating surfaces of moulds, cores, or mandrels to prevent sticking
- B28B7/384—Treating agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
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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
- C04B28/04—Portland 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
- C04B2111/00017—Aspects relating to the protection of the environment
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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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- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the technical field of concrete foundation engineering, and particularly relates to a high-strength self-compacting fair-faced concrete for a green environment-friendly bridge bent cap and a preparation process thereof. The high-strength self-compacting fair-faced concrete comprises the following components: 500-550 parts/m of cementing material3740 to 880 parts/m of fine aggregate3880-1020 parts of coarse aggregate/m39.36 to 10.40 parts/m of additive3The cementing material comprises the following components: 360-400 parts/m of cement350-75 parts/m of S75 mineral powder365-90 parts/m of class II fly ash3. The concrete of the invention has good apparent performance: the colors are basically consistent, and no obvious color difference exists; no repairing trace is basically left; the maximum diameter of surface bubbles is not more than 5mm, the depth is not more than 2mm, and the area of each square meter of bubbles is not more than 12cm2(ii) a No obvious crack, no slurry leakage, flowing and washing trace, no oil stain, ink stain and rust stain and no powder.
Description
Technical Field
The invention belongs to the technical field of concrete infrastructure engineering, and particularly relates to a high-strength self-compacting fair-faced concrete for a green environment-friendly bridge bent cap and a preparation process thereof.
Background
To meet the requirements of national engineering construction development, the research on the performance and application practice of self-compacting concrete are widely spread worldwide and are applied to many projects. Currently, the types of self-compacting concrete that have been successfully developed are: building self-compacting concrete, high-strength self-compacting concrete, large-volume self-compacting concrete, prefabricated light self-compacting concrete, compensation shrinkage self-compacting concrete, self-compacting steel fiber concrete, "sandwich" self-compacting concrete, recycled aggregate self-compacting concrete and the like. Since 1993, research on the aspect of self-compacting concrete is more and more focused by national research institutes, and research on the research and performance of the self-compacting concrete is continuously carried out by a plurality of research institutes aiming at the mix proportion design of the self-compacting concrete, such as Qinghua university, China and south university, Yuan Chongqing building university and Wuhan university.
The use of fair-faced concrete continues with the structural development of concrete. Many scholars in China explore the proportion of bare concrete and the construction process. In the 70 s of the 20 th century, the fair-faced concrete has made progress in the construction of an internal pouring and external hanging system, and is mainly applied to the inverted construction of precast concrete external wall panels. In 1997, the Beijing city established the prize of 'structural great wall cup engineering', popularized the construction of fair-faced concrete, and developed the fair-faced concrete again. In recent years, a small amount of high-grade building engineering, such as Hainan Mitsui airport, capital airport, Shanghai Pudong International airport terminal building, large inclined cylinder of eastern Mingzhu, Western Ann business center and the like, adopts fair-faced concrete. With the objective demand of green buildings, the environmental protection consciousness of people is continuously improved, people return to the deep mind of the natural idea of simplicity, and the demand of the fair-faced concrete engineering in China is no longer limited to roads, bridges, plants, airports and gymnasiums, and is also applied to industrial and civil buildings to a certain extent. The Beijing association research and development base is listed as the first large-area fair-faced concrete construction project in China by the construction department, marks that the fair-faced concrete in China has been developed to a new stage, and is an important milestone in the development history of the fair-faced concrete in China.
The self-compacting clear water concrete has the advantages of self-compacting and clear water, but the practical filling needs to be full of contradictions and problems. Obviously, the self-compaction is not beneficial to clear water, for example, the self-compaction concrete requires large flow, so that the dosage of the cementing material is large, and meanwhile, the higher air content can reduce the shearing force and increase the flow speed; in order to prevent segregation and bleeding, the mortar slurry is required to have high viscosity and high sand rate, but air bubbles are easily gathered on the surface of the concrete and are difficult to discharge, which is in contradiction with the requirement of clear water concrete for forming non-porous holes on the surface; the fair-faced concrete is expected to have over-large designed slump and low sand rate, and the slurry content and the gas content are controlled, so that the apparent quality of the fair-faced concrete is facilitated. The bare concrete should also be vibrated to improve the filling property of the concrete and eliminate air bubbles in the concrete, reduce the surface air hole content, and the self-compacting concrete adopts a vibration mode to eliminate the air bubbles to increase the possibility of segregation and bleeding of the self-compacting concrete.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a green environment-friendly high-strength self-compacting fair-faced concrete for a bridge capping beam and a preparation process thereof.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
Green environment-friendly high-strength self-compacting fair-faced concrete for bridge capping beams, and each group of high-strength self-compacting fair-faced concreteThe components are as follows according to the parts by weight: 500-550 parts/m of cementing material3740 to 880 parts/m of fine aggregate3880-1020 parts of coarse aggregate/m39.36 to 10.40 parts/m of additive3The cementing material comprises the following components in parts by weight: 360-400 parts/m of cement350-75 parts/m of S75 mineral powder365-90 parts/m of class II fly ash3。
In the scheme, the volume weight of the high-strength self-compacting fair-faced concrete is 2410-2450 kg/m3The water-glue ratio is 0.25-0.35, and the sand rate is 46% -50%.
In the scheme, the cement is P.O42.5R ordinary portland cement, the 28d strength of the cement is 44.6-51.0 MPa, and the performance index meets the national standard requirement.
In the scheme, the activity indexes of 7d and 28d of the class II fly ash and the S75 mineral powder are not lower than 70% and 90%, and the other corresponding indexes (fineness, water content, specific surface area, loss on ignition, chloride ion content and sulfur trioxide content) meet the specification requirements.
In the scheme, the fine aggregate is medium sand (river sand) with fineness modulus of 2.5-3.0 and particle grading II area.
In the scheme, the coarse aggregate is crushed stone with the particle size of 5-20 mm, and the corresponding performance index meets the requirement.
In the scheme, the additive comprises a water reducing component, a defoaming component and a slump retaining component, wherein the water reducing component is a water reducing polycarboxylic acid water reducing agent, the using amount of the water reducing polycarboxylic acid water reducing agent is 6-8% of the mass of the cementing material, the defoaming component is a defoaming agent, the using amount of the defoaming component is 0.03-0.05% of the mass of the cementing material, and the slump retaining component is a slump retaining polycarboxylic acid water reducing agent, and the using amount of the slump retaining polycarboxylic acid water reducing agent is 3-6% of the mass of the cementing material.
The preparation method of the high-strength self-compacting fair-faced concrete for the green environment-friendly bridge bent cap comprises the following steps: sequentially adding the fine aggregate, the cementing material and the coarse aggregate into a forced mixer, stirring for 40-50 s, adding water and the additive, stirring for 110-130 s, discharging, coating the surface of the steel mold with a green environment-friendly water-based release agent, molding, and removing the mold.
In the scheme, the formula of the green environment-friendly water-based release agent is as follows: the base oil is vegetable oil, the oil consumption is 40 percent (mass percent), the emulsifier combination is Span60+ SDBS, the using amount is 4 to 6 percent (mass percent), the HLB value is 9.6, and the using amounts of the thickening agent and the antirust agent are both 1 to 2 percent (mass percent); the emulsifying time is 50-60 min, the stirring speed is 1200-1500 r/min, and the dilution ratio is 1: 3-1: 1.
The formwork used by the fair-faced concrete has enough rigidity, and can not deform under the lateral pressure of the concrete, so as to ensure that the pier body has uniform structure size and consistent section and prevent concrete grout from losing. The surface of the template needs to be smooth and clean, the surface of the template is square and regular, the joint is tight, the edge milling process is adopted for processing the periphery of the steel template, and the panel is polished. The release agent is a green environment-friendly water-based release agent, and the release agent is coated as soon as possible after the steel template is derusted and planed. The work place is temporarily protected and has rain-proof and dust-proof conditions. In order to ensure that the surface of the template is dry before painting, the surface of the template is wiped clean by using dry rags in the afternoon of clear weather. The mold release agent is coated by a wool brush, the coating is uniform and does not flow and drop once, and the first coating thickness of the template can be slightly thicker. And (3) maintenance process: according to different climatic conditions and different seasons, special maintenance measures are made to ensure the quality of the self-compacting fair-faced concrete product. The wet maintenance can be adopted, and the modes of steam, watering, spraying water or covering for moisturizing and the like can be adopted. The capping beam should not be directly maintained by spraying in summer, and the internal temperature of the concrete should be reduced by an air supply cooling method. When the maintenance is carried out in the environment with high wind speed, proper windproof measures are adopted. When in winter construction, the mould removal time should be delayed. The template and the moisture-preserving layer are removed when the concrete is cooled to below 5 ℃ or when the correlation between the surface temperature of the concrete and the external temperature is not more than 20 ℃, and the concrete after the template removal is covered in time and is cured by steam. The curing time is not less than 14 days.
The invention has the beneficial effects that:
(1) The high-strength self-compacting fair-faced concrete is prepared by adopting more conventional raw materials and using a more conventional production process, the manufacturing cost is relatively low, and the construction process is simpler; the invention has the following economic analysis: the high-strength self-compacting fair-faced concrete adopts conventional P.O42.5R ordinary portland cement, industrial waste residue S75 slag micro powder, II-grade fly ash, river sand and crushed stone, does not adopt special raw materials or special production processes, has the cost basically equal to the price of commercial concrete on the market, but has the durability far higher than that of the commercial concrete, thereby meeting the structural performance requirement of the cover beam of bridge engineering.
(2) The concrete of the invention has good apparent performance: the colors are basically consistent, and no obvious color difference exists; no repairing trace is basically left; the maximum diameter of surface bubbles is not more than 5mm, the depth is not more than 2mm, and the area of each square meter of bubbles is not more than 12cm2(ii) a No obvious crack, no slurry leakage, flowing and washing trace, no oil stain, ink stain and rust stain and no powder.
(3) The high-strength self-compacting fair-faced concrete prepared by the preparation method is simple and convenient in the whole process from production to construction, good in working performance, non-viscous, non-segregation and easy to pour, the mechanical property and the durability of the high-strength self-compacting fair-faced concrete can meet the design requirements, the cost performance is high, the green environment-friendly water-based release agent is adopted, the base oil in the synthetic formula is vegetable oil which is harmless to human bodies, and the release agent is water-based, can be naturally degraded, has little pollution to the environment and has certain ornamental value.
Drawings
FIG. 1 is a record of the test process of the high strength self-compacting fair-faced concrete mixture of the present invention.
FIG. 2 shows the apparent properties of bare concrete of examples 1 to 5 and comparative examples.
Detailed Description
In order to better understand the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.
In the following examples, the cement is P.O42.5R ordinary portland cement, the 28d strength of the cement is 44.6-51.0 MPa, and the performance index meets the national standard requirement.
The activity indexes of 7d and 28d of the class II fly ash and the S75 mineral powder are not less than 70% and 90% respectively, and the other corresponding indexes (fineness, water content, specific surface area, ignition loss, chloride ion content and sulfur trioxide content) meet the specification requirements.
The fine aggregate is medium sand (river sand) with fineness modulus of 2.5-3.0 and particle grading II area.
The coarse aggregate is crushed stone with the particle size of 5-20 mm, and the corresponding performance index meets the requirement.
Example 1
A high-strength self-compacting clear concrete with high strength and water content is prepared from the following components (unit: kg/m)3) Number 1:
The admixture consists of a water reducing component (PCA-JS02 water reducing polycarboxylic acid water reducing agent), a defoaming component (DF-2006 defoaming agent) and a slump retaining component (PCA-BT02 slump retaining polycarboxylic acid water reducing agent); the volume weight of the high-strength self-compacting fair-faced concrete is 2445kg/m3The water-glue ratio is 0.32, and the sand rate is 50%.
Example 2
A high-strength self-compacting clear concrete with high strength and water content is prepared from the following components (unit: kg/m)3) Number 2:
The admixture consists of a water reducing component (PCA-JS02 water reducing polycarboxylic acid water reducing agent), a defoaming component (DF-2006 defoaming agent) and a slump retaining component (PCA-BT02 slump retaining polycarboxylic acid water reducing agent); the volume weight of the high-strength self-compacting fair-faced concrete is 2445kg/m3the water-glue ratio is 0.32, and the sand rate is 47%.
Example 3
A high-strength self-compacting clear concrete with high strength and water content is prepared from the following components (unit: kg/m)3) Number 3:
The admixture consists of a water reducing component (PCA-JS02 water reducing polycarboxylic acid water reducing agent), a defoaming component (DF-2006 defoaming agent) and a slump retaining component (PCA-BT02 slump retaining polycarboxylic acid water reducing agent); the volume weight of the high-strength self-compacting fair-faced concrete is 2445kg/m3The water-glue ratio is 0.32, and the sand rate is 47%.
Example 4
A high-strength self-compacting clear concrete with high strength and water content is prepared from the following components (unit: kg/m)3) Number 4:
The admixture consists of a water reducing component (PCA-JS02 water reducing polycarboxylic acid water reducing agent), a defoaming component (DF-2006 defoaming agent) and a slump retaining component (PCA-BT02 slump retaining polycarboxylic acid water reducing agent); the volume weight of the high-strength self-compacting fair-faced concrete is 2445kg/m3The water-glue ratio is 0.32, and the sand rate is 50%.
Example 5
a high-strength self-compacting clear concrete with high strength and water content is prepared from the following components (unit: kg/m)3) Number 5:
The additive comprises a water reducing component (PCA-JS02 water reducing polycarboxylic acid water reducing agent), a defoaming component (DF-2006 defoaming agent) and a preservativeSlump retaining component (PCA-BT02 slump retaining polycarboxylate superplasticizer); the volume weight of the high-strength self-compacting fair-faced concrete is 2445kg/m3The water-glue ratio is 0.32, and the sand rate is 42%.
Comparative example
Conventional C50 concrete mixing ratio (unit: kg/m)3) As follows, numbered 6:
The admixture consists of a water reducing component (PCA-JS02 water reducing polycarboxylic acid water reducing agent), a defoaming component (DF-2006 defoaming agent) and a slump retaining component (PCA-BT02 slump retaining polycarboxylic acid water reducing agent); the volume weight of the high-strength self-compacting fair-faced concrete is 2410kg/m3The water-gel ratio was 0.34, and the sand ratio was 36%.
The concrete of examples 1 to 5 of the present invention and the concrete of the comparative example were subjected to performance tests, and the test results are shown in table 1 below.
TABLE 1 test results
Remarking: number 6 is the conventional C50 concrete test described in the comparative example.
As can be seen from table 1: the green environment-friendly high-strength self-compacting fair-faced concrete has good apparent fair-faced performance under the conditions of meeting the requirements of strength and durability, and can be well popularized and applied to the bent cap structural engineering for bridges.
By combining the data in table 1 and the apparent condition in fig. 2, after the environment-friendly water-based release agent is adopted in the comparative example, the bubble project can meet the requirements of common fair-faced concrete, the apparent bubble amount is less and the bubbles are dispersed, but the apparent effect of clear water is poorer than that of the examples 1 to 5, the examples 1 to 5 all meet the relevant requirements of the facing fair-faced concrete bubble project, the maximum diameter of the bubbles is not more than 8mm, and the bubble surface per square meterProduct no greater than 20cm2The surface flatness is good, obvious cracks and color differences do not exist, the fair-faced concrete has a better fair-faced effect under the condition that the requirements of the fair-faced concrete are met, in the aspect of self-compaction performance, through comparison of collapse time and V leakage time, the examples 1-5 are obviously superior to the comparative example, and in the examples 1-5, the test data have larger difference along with adjustment of the proportion. In general comparison, the best overall performance of the self-compacting in clear water is example 1.
It is apparent that the above embodiments are only examples for clearly illustrating and do not limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications are therefore intended to be included within the scope of the invention as claimed.
Claims (9)
1. the high ~ strength self ~ compacting fair ~ faced concrete for the green and environment ~ friendly bridge bent cap is characterized by comprising 500 ~ 550 parts by weight of cementing materials per m3740 ~ 880 parts/m of fine aggregate3880-1020 parts of coarse aggregate/m39.36 ~ 10.40 parts/m of additive3the cementing material comprises, by weight, 360-400 parts of cement per m350 ~ 75 parts/m of S75 mineral powder365 ~ 90 parts/m of class II fly ash3。
2. the high ~ strength self ~ compacting fair ~ faced concrete for the green environment ~ friendly bridge capping beam of claim 1, wherein the bulk density of the high ~ strength self ~ compacting fair ~ faced concrete is 2410 ~ 2450kg/m for cultivation, the water ~ to ~ gel ratio is 0.25 ~ 0.35, and the sand rate is 46 ~ 50%.
3. the high ~ strength self ~ compacting fair ~ faced concrete for the green environment ~ friendly bridge capping beam according to claim 1, wherein the cement is P.O42.5R ordinary portland cement, and the 28d strength of the cement is 44.6 ~ 51.0 MPa.
4. the high-strength self-compacting fair-faced concrete for the green and environment-friendly bridge capping beam as claimed in claim 1, wherein the activity indexes of 7d and 28d of the class II fly ash and the S75 mineral powder are not less than 70% and 90% respectively.
5. the high ~ strength self ~ compacting fair ~ faced concrete for the green and environment ~ friendly bridge capping beam as claimed in claim 1, wherein the fine aggregate is medium sand (river sand) with fineness modulus of 2.5 ~ 3.0 and particle grading II area, and the mud content is less than 1%.
6. the high ~ strength self ~ compacting fair ~ faced concrete for the green environment ~ friendly bridge capping beam according to claim 1, wherein the coarse aggregate is crushed stone with a particle size of 5 ~ 20 mm.
7. the high ~ strength self ~ compacting fair ~ faced concrete for the green environment ~ friendly bridge capping beam as claimed in claim 1, wherein the admixture is composed of a water reducing component, a defoaming component and a slump retaining component, wherein the water reducing component is a water reducing polycarboxylic acid water reducing agent, the consumption of the water reducing polycarboxylic acid water reducing agent is 6% ~ 8% of the mass of the cementing material, the defoaming component is a defoaming agent, the consumption of the defoaming component is 0.03% ~ 0.05% of the mass of the cementing material, and the slump retaining component is a slump retaining polycarboxylic acid water reducing agent, the consumption of the slump retaining polycarboxylic acid water reducing agent is 3% ~ 6% of the mass of the cementing material.
8. the preparation method of the high ~ strength self ~ compacting fair ~ faced concrete for the green and environment ~ friendly bridge capping beam as claimed in any one of claims 1 to 7 is characterized by comprising the following steps of sequentially adding fine aggregate, cementing material and coarse aggregate into a forced mixer, stirring for 40 ~ 50s, adding water and additives, stirring for 110 ~ 130s, discharging, coating the surface of a steel mold with a green and environment ~ friendly water ~ based release agent, and removing the mold after molding.
9. the preparation method of the high of ~ strength self of ~ compacting fair of ~ faced concrete for the green environment of ~ friendly bridge capping beam as claimed in claim 8, wherein the green environment of ~ friendly water of ~ based release agent comprises the following components of vegetable oil as a base oil, oil consumption of 40%, Span60+ SDBS as an emulsifier combination in an amount of 4% of ~ 6%, HLB value of 9.6, 1% of ~ 2% of a thickener and an antirust agent in an amount, emulsification time of 50min of ~ 60min, stirring speed of 1200r/min of ~ 1500r/min, and dilution multiple of 1:3 of ~ 1: 1.
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| CN110818366A (en) * | 2019-12-25 | 2020-02-21 | 泸州临港思源混凝土有限公司 | Fair-faced concrete and preparation process thereof |
| CN111362643A (en) * | 2020-04-09 | 2020-07-03 | 南通航宇结构件有限公司 | Preparation method of concrete for high-volume prefabricated part |
| CN111807771A (en) * | 2020-07-14 | 2020-10-23 | 四川华西绿舍建材有限公司 | Self-compacting fair-faced concrete for special-shaped column structure and preparation method thereof |
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| CN110818366B (en) * | 2019-12-25 | 2021-08-17 | 泸州临港思源混凝土有限公司 | Fair-faced concrete and preparation process thereof |
| CN111362643A (en) * | 2020-04-09 | 2020-07-03 | 南通航宇结构件有限公司 | Preparation method of concrete for high-volume prefabricated part |
| CN111807771A (en) * | 2020-07-14 | 2020-10-23 | 四川华西绿舍建材有限公司 | Self-compacting fair-faced concrete for special-shaped column structure and preparation method thereof |
| CN112210426A (en) * | 2020-10-14 | 2021-01-12 | 中建西部建设贵州有限公司 | Efficient release agent for fair-faced concrete and preparation method thereof |
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