CN117381979A - Hydrophobic concrete with high freeze thawing resistance and preparation method thereof - Google Patents
Hydrophobic concrete with high freeze thawing resistance and preparation method thereof Download PDFInfo
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- CN117381979A CN117381979A CN202311378015.7A CN202311378015A CN117381979A CN 117381979 A CN117381979 A CN 117381979A CN 202311378015 A CN202311378015 A CN 202311378015A CN 117381979 A CN117381979 A CN 117381979A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 33
- 238000010257 thawing Methods 0.000 title claims abstract description 32
- 230000002209 hydrophobic effect Effects 0.000 title claims abstract description 26
- 239000012615 aggregate Substances 0.000 claims description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 41
- 239000000843 powder Substances 0.000 claims description 39
- 239000004568 cement Substances 0.000 claims description 38
- 239000000463 material Substances 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 28
- 238000010276 construction Methods 0.000 claims description 26
- 238000002156 mixing Methods 0.000 claims description 24
- 239000002893 slag Substances 0.000 claims description 23
- 238000013461 design Methods 0.000 claims description 15
- 238000005488 sandblasting Methods 0.000 claims description 15
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- 239000003638 chemical reducing agent Substances 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 11
- 230000001680 brushing effect Effects 0.000 claims description 10
- 238000002474 experimental method Methods 0.000 claims description 10
- 239000000835 fiber Substances 0.000 claims description 10
- 239000004575 stone Substances 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000000654 additive Substances 0.000 claims description 8
- 239000002657 fibrous material Substances 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 238000012423 maintenance Methods 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- 238000004381 surface treatment Methods 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 6
- 239000012774 insulation material Substances 0.000 claims description 6
- 239000004743 Polypropylene Substances 0.000 claims description 5
- 239000011398 Portland cement Substances 0.000 claims description 5
- -1 polypropylene Polymers 0.000 claims description 5
- 229920001155 polypropylene Polymers 0.000 claims description 5
- 238000009864 tensile test Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 5
- 239000007798 antifreeze agent Substances 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 4
- 230000001788 irregular Effects 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 238000007596 consolidation process Methods 0.000 claims description 3
- 235000020188 drinking water Nutrition 0.000 claims description 3
- 239000003651 drinking water Substances 0.000 claims description 3
- 238000012854 evaluation process Methods 0.000 claims description 3
- 239000010419 fine particle Substances 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 239000010453 quartz Substances 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000008399 tap water Substances 0.000 claims description 3
- 235000020679 tap water Nutrition 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 229920005646 polycarboxylate Polymers 0.000 claims description 2
- 239000011863 silicon-based powder Substances 0.000 claims description 2
- 230000001276 controlling effect Effects 0.000 description 9
- 238000007710 freezing Methods 0.000 description 9
- 230000008014 freezing Effects 0.000 description 8
- 239000002699 waste material Substances 0.000 description 8
- 238000011161 development Methods 0.000 description 5
- 238000005266 casting Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 239000002910 solid waste Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/04—Supplying or proportioning the ingredients
- B28C7/0404—Proportioning
- B28C7/0418—Proportioning control systems therefor
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/24—Safety or protective measures preventing damage to building parts or finishing work during construction
- E04G21/246—Safety or protective measures preventing damage to building parts or finishing work during construction specially adapted for curing concrete in situ, e.g. by covering it with protective sheets
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Ceramic Engineering (AREA)
- Automation & Control Theory (AREA)
- Dispersion Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a high freeze thawing resistant hydrophobic concrete and a preparation method thereof, which are applied to the technical field of concrete.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to hydrophobic concrete with high freeze thawing resistance and a preparation method thereof.
Background
Based on the preparation environment and the use scene of the hydrophobic concrete, various conditions can be met when the hydrophobic concrete is prepared, but the preparation method is not limited to one mentioned below, and the preparation of the hydrophobic concrete needs to prepare cementing materials, granular aggregates, water, and additives and admixtures added when necessary according to a certain proportion, and the materials are uniformly stirred, compactly molded and cured and hardened.
The existing high freeze thawing resistant hydrophobic concrete and the preparation method thereof have the defects that the monitoring of the proportion is strict when the concrete is prepared, but the environmental control of a construction preparation area is seldom controlled in detail, the possibility of generating cracks after long-time use of the whole pouring process is high, and in addition, the proportion improvement space is available for the freeze thawing resistant performance.
Based on the above-mentioned situation, we find that the high-freeze-thawing resistant hydrophobic concrete and the preparation method thereof in the prior art are difficult to avoid the problems at the same time, so we propose a high-freeze-thawing resistant hydrophobic concrete and the preparation method thereof which optimize the proportion and attach importance to the environment in the process to ensure the strength and quality in the preparation process.
Disclosure of Invention
The invention aims at the existing hydrophobic concrete with high freeze thawing resistance and the preparation method thereof, and has the advantages that the proportion is optimized, and the environment is emphasized in the working procedure to ensure the strength and the quality in the preparation process.
The technical aim of the invention is realized by the following technical scheme: a preparation method of hydrophobic concrete with high freeze thawing resistance comprises the following steps:
s1, cleaning a preparation area, simultaneously treating a foundation, repairing and adjusting irregular or uneven places, arranging a frame and a guide line to ensure that the shape and the size of concrete meet design requirements, then placing cement, aggregate and water into a concrete mixer according to a matching proportion, simultaneously blending a water reducing agent and a curing agent, adding an additive after the completion of mixing, and continuously stirring;
s2, controlling slump of concrete, adjusting water consumption according to design requirements, selecting a proper pouring mode, flexibly switching manual pouring, pumping or spraying, and simultaneously controlling construction temperature to prevent concrete from being dried too early or hardened too fast, wherein admixture and covering heat-insulating materials are added to regulate the temperature of the concrete, and for larger concrete structures or concrete walls, adopting a layered pouring mode to ensure tight connection and seamless connection between each layer;
s3, isolating a construction area, waiting for concrete consolidation and hardening, curing, adopting regular watering for curing and covering heat insulation materials for curing, performing surface treatment, trowelling, brushing, frosting, sand blasting and the like on the surface of the concrete according to design requirements and use requirements, sampling and detecting the concrete after construction is completed, and evaluating the compressive strength and the tensile strength performance.
By adopting the technical scheme, better concrete performance can be obtained by setting trial experiments and precisely controlling the mixing proportion, thus the performances of the concrete in terms of strength, fluidity, durability and the like can be improved, the working performance and durability of the concrete can be improved by adding a proper amount of additives such as a water reducing agent, a curing agent and the like, the construction efficiency and the concrete quality are improved, the construction temperature of the concrete can be controlled in a proper way to prevent the concrete from being dried prematurely or being hardened too fast, so the strength of the concrete is ensured, the internal stress can be dispersed in a layered casting way for a larger concrete structure or concrete wall, the generation of cracks is reduced, the structural strength and stability are improved, the early strength development of the concrete can be promoted by the methods of regularly watering, curing, covering heat insulation materials and the like, and the durability and the anti-seepage performance of the concrete are improved.
The invention is further provided with: before mixing cement, aggregate and water, optionally, trial experiments are performed to determine the optimal mixing ratio while ensuring the strength, flowability, durability and workability of the concrete.
By adopting the technical scheme, the experiment finished product can be tested under the condition of consuming a small amount of materials by performing trial experiment, and the repeated processing or material waste caused by the fact that the strength after a large amount of preparation operations cannot meet the requirements is avoided.
The invention is further provided with: and after the concrete is formally put into use, proper subsequent maintenance work is carried out, wherein the maintenance content comprises regular watering maintenance, covering a protective film and the like, and meanwhile, severe temperature change is avoided so as to maintain the final strength and durability of the concrete.
By adopting the technical scheme, the concrete can be prevented from cracking or being polluted by impurities due to excessive drying through continuous maintenance.
The invention is further provided with: when cement, aggregate and water are mixed, a concrete mixer is adopted, and a manually operated small mixer or a mechanically and automatically operated large mixer is flexibly selected according to actual needs, so that a concrete pump truck is required to be used when the concrete is conveyed from a mixing station to a construction site.
By adopting the technical scheme, the small-sized stirrer or the large-sized stirrer can be flexibly selected for processing a large amount or small batches of materials as required, the situation that the power consumption is too high or the efficiency is too low is avoided, and the concrete pump truck can be used for continuously conveying the materials.
The invention is further provided with: when the concrete is poured in layers and a structure with a specific shape is formed, a wooden mold, a steel plate mold and a special material mold are flexibly selected according to design requirements and construction modes, and a spraying system, a curing box and a curing film are adopted when the curing action process is carried out.
By adopting the technical scheme, the spray system, the curing box and the curing film are used for keeping the humidity and the temperature of the concrete, so that the early strength development of the concrete is promoted, and the mould is selected as required, so that flexible process adjustment can be conveniently carried out according to actual conditions.
The invention is further provided with: the surface treatment process comprises a trowelling machine, a brushing machine, a sanding machine, a sand blasting machine, a pressure testing machine, a tensile testing machine and a concrete thickness measuring instrument, wherein the trowelling machine, the brushing machine, the sanding machine and the sand blasting machine are used for trowelling, cleaning, sanding, sand blasting and the like on the surface of concrete, and the detection and evaluation process comprises a pressure testing machine, a tensile testing machine and a concrete thickness measuring instrument.
By adopting the technical scheme, the concrete surface can be conveniently and respectively smooth through setting up trowelling machine, scrubbing machine, dull polish machine and sand blasting machine equipment, and a plurality of parameters can be conveniently carried out to the concrete through multiple equipment and data acquisition is carried out.
The invention is further provided with: the hydrophobic concrete with high freeze thawing resistance comprises 19.02% of cement, 5.56% of slag powder, 42.31% of coarse aggregate, 28.21% of fine aggregate and 7.89% of water;
adding proper amount of admixture, fiber material and micro powder according to actual conditions.
By adopting the technical scheme, the use of slag powder can replace part of cement, the use amount of cement in concrete is reduced, environmental pollution and resource consumption are reduced, the slag powder is a product of waste utilization, the use of slag powder can reduce the discharge of solid waste, environmental protection is facilitated, the use of slag powder can reduce the consumption of cement, cost is reduced, the proper gradation of coarse aggregate can improve the utilization rate of stones, resource waste is reduced, the use of micro powder can fill micropores in a cement gel, the strength and durability of concrete are improved, the addition of fiber materials can improve the cracking resistance of concrete, the occurrence of cracks is reduced, the use of fine aggregate can reduce the content of cement paste, the shrinkage deformation of concrete is reduced, the use of admixture can adjust the rheological property of concrete, the stability and working performance of concrete are improved, the use of high-performance cement, slag powder and other admixtures can enhance the anti-freezing and thawing properties of concrete, the water ratio of concrete is controlled, the fluidity and the demand of concrete are ensured, the excessive water content of the fine aggregate can be reduced, the proper freezing and thawing damage can be avoided in the concrete is reduced, the proper freezing and thawing ratio is reduced, the freezing and thawing damage can be reduced, and the proper water loss can be reduced.
The invention is further provided with: the cement is 425# Portland cement, the slag powder meets the GB/T18046 standard, and the coarse aggregate is stone or gravel with the grading of 5-20 mm.
By adopting the technical scheme, the quality of the cement material can be controlled by setting 425# Portland cement, so that the general stability in the material preparation process can be ensured, the slag powder meeting the standard can ensure the material strength, and the coarse aggregate with proper grading can lead the blending process to be more reasonable.
The invention is further provided with: the fine aggregate is selected from sand stone or fine aggregate with the grading of 0-5mm, drinking water or tap water meeting the national standard is used for water, and the micro powder is selected from fine particle materials such as silicon powder, quartz powder and the like.
By adopting the technical scheme, the fine aggregate can be matched with other materials in the preparation process by controlling the grading of the fine aggregate, so that the proportion is more uniform, the quality of water is controlled, the quality of impurities is also controlled, and the quality of the prepared materials is controlled in an auxiliary manner in the preparation process by selecting the micro powder.
The invention is further provided with: the antifreeze agent and the expanding agent are selected to be in accordance with the relevant national standard, the polycarboxylate water reducer is used as the expanding agent, and the fiber material is selected to be polypropylene fiber and steel fiber according to the requirements.
By adopting the technical scheme, the polycarboxylic acid water reducer can have good expansion performance on materials during preparation by selecting the admixture meeting the standard for ensuring the proportioning quality of the materials, and the polypropylene fiber and the steel fiber have enough strength.
In summary, the invention has the following beneficial effects:
by setting trial experiments and precisely controlling the mixing proportion, better concrete performance can be obtained, thus the performances of the concrete in terms of strength, fluidity, durability and the like can be improved, the working performance and durability of the concrete can be improved by adding a proper amount of additives such as water reducing agent, curing agent and the like, the construction efficiency and the quality of the concrete can be improved, the construction temperature of the concrete can be controlled in a proper way to prevent the concrete from being dried prematurely or being hardened too fast, thus the strength of the concrete can be ensured, for larger concrete structures or concrete walls, the internal stress can be dispersed in a layered casting way, the generation of cracks can be reduced, the structural strength and stability can be improved, the early strength development of the concrete can be promoted by the methods of regularly watering, curing, covering heat insulation materials and the like, the durability and the impermeability of the concrete can be improved, the use of the slag powder can replace part of cement, reduce the use amount of cement in concrete, reduce environmental pollution and resource consumption, the slag powder is a product of waste utilization, the use of the slag powder can reduce the discharge of solid waste, is beneficial to environmental protection, the use of the slag powder can reduce the consumption of cement, reduce cost, the use of coarse aggregate can improve the utilization rate of stones, reduce resource waste, the use of micro powder can fill micropores in cement gel, improve the strength and durability of concrete, the addition of fiber materials can improve the crack resistance of concrete, reduce the occurrence of cracks, the use of fine aggregate can reduce the content of cement paste, reduce shrinkage deformation of concrete, the use of the admixture can adjust the rheological property of concrete, improve the stability and working performance of concrete, use of high-performance cement, the admixture such as slag powder can enhance the freeze-thawing resistance of concrete, control the water-cement ratio of the concrete, ensure the fluidity and water demand of the concrete, prevent excessive water from entering the concrete, thereby reducing the freeze-thawing damage, add a proper antifreeze agent, reduce the solidification temperature of the concrete at low temperature, reduce the freeze-thawing damage, reasonably control the proportion of coarse and fine aggregates in the concrete, ensure the compactness of the aggregates and reduce the damage in the freeze-thawing cycle.
Drawings
FIG. 1 is a flow chart of a preparation method of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1:
a preparation method of hydrophobic concrete with high freeze thawing resistance comprises the following steps:
s1, cleaning a preparation area, simultaneously treating a foundation, repairing and adjusting irregular or uneven places, arranging a frame and a guide line to ensure that the shape and the size of concrete meet design requirements, then placing cement, aggregate and water into a concrete mixer according to a matching proportion, simultaneously blending a water reducing agent and a curing agent, adding an additive after the completion of mixing, and continuously stirring;
s2, controlling slump of concrete, adjusting water consumption according to design requirements, selecting a proper pouring mode, flexibly switching manual pouring, pumping or spraying, and simultaneously controlling construction temperature to prevent concrete from being dried too early or hardened too fast, wherein admixture and covering heat-insulating materials are added to regulate the temperature of the concrete, and for larger concrete structures or concrete walls, adopting a layered pouring mode to ensure tight connection and seamless connection between each layer;
s3, isolating a construction area, waiting for concrete consolidation and hardening, curing, adopting regular watering for curing and covering heat insulation materials for curing, performing surface treatment, trowelling, brushing, frosting, sand blasting and the like on the surface of the concrete according to design requirements and use requirements, sampling and detecting the concrete after construction is completed, and evaluating the compressive strength and the tensile strength performance;
the concrete has better concrete performance by setting trial experiments and precisely controlling the mixing proportion, so that the performances of the concrete in terms of strength, fluidity, durability and the like can be improved, the working performance and durability of the concrete can be improved by adding a proper amount of additives such as a water reducing agent, a curing agent and the like, the construction efficiency and the quality of the concrete are improved, the construction temperature of the concrete can be controlled in a proper manner to prevent the concrete from being dried prematurely or being hardened too fast, the strength of the concrete is ensured, the internal stress can be dispersed in a layered casting manner for a larger concrete structure or concrete wall, the generation of cracks is reduced, the structural strength and stability are improved, and the early strength development of the concrete and the durability and the impervious performance of the concrete can be promoted by the methods of regularly watering, curing, covering heat insulation materials and the like.
Before cement, aggregate and water are mixed, optionally under the condition of ensuring the strength, fluidity, durability and workability of the concrete, trial experiments are carried out to determine the optimal mixing proportion, and the effect of experimental finished products can be tested under the condition of consuming a small amount of materials by carrying out the trial experiments, so that the repeated processing or material waste caused by the fact that the strength cannot meet the requirement after a large amount of preparation operations is avoided.
After the concrete is formally put into use, proper subsequent curing work is carried out, curing contents comprise regular watering curing, covering a protective film and the like, and meanwhile, severe temperature change is avoided, so that the final strength and durability of the concrete are maintained, and cracking or impurity pollution of the concrete caused by excessive drying can be avoided through continuous curing.
The concrete mixer is adopted when mixing cement, aggregate and water, and the manually operated small mixer or the mechanically automatic operated large mixer is flexibly selected according to actual needs, a concrete pump truck is used when concrete is conveyed to a construction site from a mixing station, a large amount of materials or small batches of materials can be conveniently processed as required through the flexibly selected small mixer or large mixer, and the situation that the power consumption is too high or the efficiency is too low is avoided.
According to design requirements and construction modes, a wood mold, a steel plate mold and a special material mold are flexibly selected when the concrete is subjected to layered casting and a structure with a specific shape is formed, a spraying system, a curing box and a curing film are adopted when a curing action procedure is carried out, the spraying system, the curing box and the curing film are adopted to keep the humidity and the temperature of the concrete, the early strength development of the concrete is promoted, and the mold is selected as required so as to facilitate flexible process adjustment according to actual conditions.
The trowelling machine, the brushing machine, the sanding machine and the sand blasting machine equipment are selected when the surface treatment process is carried out, the trowelling machine, the cleaning machine, the sanding machine, the sand blasting machine and the like are used for trowelling, grinding, sand blasting and the like are carried out on the concrete surface, the pressure testing machine, the tensile testing machine and the concrete thickness measuring instrument equipment are selected when the detection and evaluation process is carried out, the device is used for detecting and evaluating the performance of concrete, can be used for respectively carrying out smooth treatment on the surface of the concrete by arranging trowelling machine, brushing machine, sanding machine and sand blasting machine equipment, and can be used for carrying out data acquisition on a plurality of parameters of the concrete by a plurality of equipment.
The hydrophobic concrete with high freeze thawing resistance comprises 19.02% of cement, 5.56% of slag powder, 42.31% of coarse aggregate, 28.21% of fine aggregate and 7.89% of water;
adding a proper amount of admixture, fiber materials and micro powder according to actual conditions;
the slag powder can replace part of cement, the consumption of cement in concrete is reduced, environmental pollution and resource consumption are reduced, the slag powder is a product of waste utilization, the slag powder can reduce the discharge of solid waste, environmental protection is facilitated, the slag powder can reduce the consumption of cement, the cost is reduced, the coarse aggregate can improve the utilization rate of stones by proper grading, the resource waste is reduced, the micro powder can fill micropores in a cement gel, the strength and durability of the concrete are improved, the addition of fiber materials can improve the crack resistance of the concrete, the occurrence of cracks is reduced, the use of fine aggregate can reduce the content of cement paste, the shrinkage deformation of the concrete is reduced, the use of the admixture can adjust the rheological property of the concrete, the stability and the working performance of the concrete are improved, the high-performance cement, the slag powder and other admixtures are used, the freezing and thawing resistance of the concrete can be enhanced, the water ratio of the concrete is controlled, the fluidity and the demand of the concrete are ensured, the excessive micro powder can be filled in micropores in the cement gel, the concrete is further reduced, the proper freezing and thawing ratio is reduced, the freezing and thawing damage of the fine aggregate can be controlled, the freezing and thawing damage of the fine aggregate can be reduced, the proper proportion is reduced, and the freezing and thawing damage of the concrete can be reduced.
The cement is 425# Portland cement, slag powder accords with GB/T18046 standard, stone or gravel with 5-20mm grading is used for coarse aggregate, the quality of cement materials can be controlled by setting 425# Portland cement, the stability of the materials in the preparation process can be ensured, the slag powder accords with the standard can ensure the strength of the materials, and the coarse aggregate with proper grading can enable the preparation process to be more reasonable.
The fine aggregate is selected from sand stone or fine aggregate with the grading of 0-5mm, drinking water or tap water meeting the national standard is used for water, fine particle materials such as silica powder, quartz powder and the like are selected for micro powder, other materials in the preparation process can be matched by controlling the grading of the fine aggregate, the proportion is more uniform, the quality of water is controlled, the quality of impurities is also controlled, and the quality of the prepared material is controlled in an auxiliary mode in the preparation process by selecting the micro powder.
The antifreeze agent and the expanding agent are selected to be in accordance with the relevant national standard, the polycarboxylic acid water reducer is used as the expanding agent, the polypropylene fiber and the steel fiber are selected as required, the blending agent in accordance with the standard is selected to ensure the proportioning quality of the material, the polycarboxylic acid water reducer has good expansion performance on the material during preparation, and the polypropylene fiber and the steel fiber have enough strength.
The use process is briefly described: firstly, trial-mix experiments are carried out, the optimal mixing proportion is determined, then the preparation area is cleaned, the foundation is treated, irregular or uneven places are repaired and regulated, and the frame and the guide line are arranged, so that the shape and the size of concrete meet the design requirement, then cement, aggregate and water are placed into a concrete mixer according to the mixing proportion, meanwhile, water reducing agent and curing agent are mixed, additives are added after the mixing is finished, mixing is continued, the slump of the concrete is controlled, the water consumption is regulated according to the design requirement, meanwhile, a proper pouring mode is selected, manual pouring, pumping or spraying is flexibly switched, the construction temperature is controlled, so that the concrete is prevented from being dried prematurely or hardened excessively quickly, the concrete temperature is regulated, the tight connection and the seamless connection between each layer are ensured by adopting a layered pouring mode, the construction area is isolated, concrete is waited for solidification and hardening, curing is carried out, the periodic watering and the covering material are adopted, finally, the surface treatment is carried out according to the design requirement and the use requirement, the concrete surface is subjected to trowelling, brushing, sand blasting, tensile strength and the like are carried out, the subsequent detection and the compressive strength is carried out, the construction strength is evaluated properly, and the subsequent construction strength is evaluated.
The present embodiment is only for explanation of the present invention and is not to be construed as limiting the present invention, and modifications to the present embodiment, which may not creatively contribute to the present invention as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present invention.
Claims (10)
1. A preparation method of hydrophobic concrete with high freeze thawing resistance is characterized in that: the method comprises the following steps:
s1, cleaning a preparation area, simultaneously treating a foundation, repairing and adjusting irregular or uneven places, arranging a frame and a guide line to ensure that the shape and the size of concrete meet design requirements, then placing cement, aggregate and water into a concrete mixer according to a matching proportion, simultaneously blending a water reducing agent and a curing agent, adding an additive after the completion of mixing, and continuously stirring;
s2, controlling slump of concrete, adjusting water consumption according to design requirements, selecting a proper pouring mode, flexibly switching manual pouring, pumping or spraying, and simultaneously controlling construction temperature to prevent concrete from being dried too early or hardened too fast, wherein admixture and covering heat-insulating materials are added to regulate the temperature of the concrete, and for larger concrete structures or concrete walls, adopting a layered pouring mode to ensure tight connection and seamless connection between each layer;
s3, isolating a construction area, waiting for concrete consolidation and hardening, curing, adopting regular watering for curing and covering heat insulation materials for curing, performing surface treatment, trowelling, brushing, frosting, sand blasting and the like on the surface of the concrete according to design requirements and use requirements, sampling and detecting the concrete after construction is completed, and evaluating the compressive strength and the tensile strength performance.
2. The method for preparing the hydrophobic concrete with high freeze thawing resistance according to claim 1, wherein the method comprises the following steps: before mixing cement, aggregate and water, optionally, trial experiments are performed to determine the optimal mixing ratio while ensuring the strength, flowability, durability and workability of the concrete.
3. The method for preparing the hydrophobic concrete with high freeze thawing resistance according to claim 1, wherein the method comprises the following steps: and after the concrete is formally put into use, proper subsequent maintenance work is carried out, wherein the maintenance content comprises regular watering maintenance, covering a protective film and the like, and meanwhile, severe temperature change is avoided so as to maintain the final strength and durability of the concrete.
4. The method for preparing the hydrophobic concrete with high freeze thawing resistance according to claim 1, wherein the method comprises the following steps: when cement, aggregate and water are mixed, a concrete mixer is adopted, and a manually operated small mixer or a mechanically and automatically operated large mixer is flexibly selected according to actual needs, so that a concrete pump truck is required to be used when the concrete is conveyed from a mixing station to a construction site.
5. The method for preparing the hydrophobic concrete with high freeze thawing resistance according to claim 1, wherein the method comprises the following steps: when the concrete is poured in layers and a structure with a specific shape is formed, a wooden mold, a steel plate mold and a special material mold are flexibly selected according to design requirements and construction modes, and a spraying system, a curing box and a curing film are adopted when the curing action process is carried out.
6. The method for preparing the hydrophobic concrete with high freeze thawing resistance according to claim 1, wherein the method comprises the following steps: the surface treatment process comprises a trowelling machine, a brushing machine, a sanding machine, a sand blasting machine, a pressure testing machine, a tensile testing machine and a concrete thickness measuring instrument, wherein the trowelling machine, the brushing machine, the sanding machine and the sand blasting machine are used for trowelling, cleaning, sanding, sand blasting and the like on the surface of concrete, and the detection and evaluation process comprises a pressure testing machine, a tensile testing machine and a concrete thickness measuring instrument.
7. A highly freeze-thaw resistant hydrophobic concrete suitable for use in a method of preparing a highly freeze-thaw resistant hydrophobic concrete according to claims 1-6, wherein: comprises cement (19.02%), slag powder (5.56%), coarse aggregate (42.31%), fine aggregate (28.21%) and water (7.89%);
adding proper amount of admixture, fiber material and micro powder according to actual conditions.
8. The highly freeze-thaw resistant hydrophobic concrete of claim 7, wherein: the cement is 425# Portland cement, the slag powder meets the GB/T18046 standard, and the coarse aggregate is stone or gravel with the grading of 5-20 mm.
9. The highly freeze-thaw resistant hydrophobic concrete of claim 7, wherein: the fine aggregate is selected from sand stone or fine aggregate with the grading of 0-5mm, drinking water or tap water meeting the national standard is used for water, and the micro powder is selected from fine particle materials such as silicon powder, quartz powder and the like.
10. The highly freeze-thaw resistant hydrophobic concrete of claim 7, wherein: the antifreeze agent and the expanding agent are selected to be in accordance with the relevant national standard, the polycarboxylate water reducer is used as the expanding agent, and the fiber material is selected to be polypropylene fiber and steel fiber according to the requirements.
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| CN202311378015.7A CN117381979A (en) | 2023-10-24 | 2023-10-24 | Hydrophobic concrete with high freeze thawing resistance and preparation method thereof |
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| CN202311378015.7A CN117381979A (en) | 2023-10-24 | 2023-10-24 | Hydrophobic concrete with high freeze thawing resistance and preparation method thereof |
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