CN112897943A - High-strength anti-freezing anti-cracking concrete - Google Patents
High-strength anti-freezing anti-cracking concrete Download PDFInfo
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- CN112897943A CN112897943A CN202110163643.8A CN202110163643A CN112897943A CN 112897943 A CN112897943 A CN 112897943A CN 202110163643 A CN202110163643 A CN 202110163643A CN 112897943 A CN112897943 A CN 112897943A
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- 238000005336 cracking Methods 0.000 title claims abstract description 15
- 238000007710 freezing Methods 0.000 title claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 66
- 239000000463 material Substances 0.000 claims abstract description 43
- 239000004568 cement Substances 0.000 claims abstract description 37
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 33
- 239000000843 powder Substances 0.000 claims abstract description 31
- 239000000835 fiber Substances 0.000 claims abstract description 24
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 20
- 238000002156 mixing Methods 0.000 claims abstract description 16
- 239000002245 particle Substances 0.000 claims abstract description 15
- 239000000654 additive Substances 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 9
- 230000000996 additive effect Effects 0.000 claims abstract description 8
- 239000004576 sand Substances 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims description 103
- 238000012216 screening Methods 0.000 claims description 38
- 230000007246 mechanism Effects 0.000 claims description 33
- 239000000203 mixture Substances 0.000 claims description 24
- 230000005540 biological transmission Effects 0.000 claims description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims description 6
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 6
- -1 polypropylene Polymers 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 6
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims description 6
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 3
- 239000010883 coal ash Substances 0.000 claims description 3
- 150000002191 fatty alcohols Chemical class 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 229920001778 nylon Polymers 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000000344 soap Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 239000011083 cement mortar Substances 0.000 claims 1
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 7
- 230000008014 freezing Effects 0.000 description 5
- 230000003487 anti-permeability effect Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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- 238000006703 hydration reaction Methods 0.000 description 2
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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
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
-
- 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The invention belongs to the technical field of concrete, and particularly relates to high-strength frost-resistant cracking-resistant concrete which comprises cement, aggregate, an additive, a powder admixture and fibers, the aggregate comprises coarse aggregate and fine aggregate, the coarse aggregate is selected from broken stones or pebbles, the particle size of the coarse aggregate is 5-25mm, the fine aggregate is river sand, the fineness modulus of the fine aggregate is 2.2-1.6, the average grain diameter is 0.35-0.25mm, the admixture comprises an air entraining agent and a water reducing agent, the invention can effectively improve the frost resistance and crack resistance of concrete, prevent the concrete from being frozen due to low environmental temperature in the process of setting and curing, and can effectively screen the materials before mixing.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to high-strength anti-freezing anti-cracking concrete.
Background
The concrete is a general name of engineering composite materials formed by cementing aggregates into a whole by cementing materials, and the term concrete generally refers to cement concrete which is obtained by mixing cement serving as a cementing material, gravel and fine sand serving as aggregates with water according to a certain proportion, and optionally adding additives and admixtures and stirring, and is also called common concrete; the concrete has the characteristics of rich raw materials, low price and simple production process, so that the consumption of the concrete is increased, and meanwhile, the concrete also has the characteristics of high compressive strength, good durability, wide strength grade range and the like.
After the concrete is poured, the concrete needs to be gradually condensed and hardened for a certain time until the concrete obtains the final strength, the hydration effect of the cement is mainly in direct proportion to the environment temperature, namely, the hydration effect is accelerated when the environment temperature rises, and when the temperature is reduced until the temperature is lower than the freezing point, the concrete is easily frozen, so that the condition that the concrete is frozen and cracked in the condensation and hardening process occurs, and the water-cement ratio, the aggregate proportion and the quality of the concrete and the use of an additive are main factors influencing the frost resistance of the concrete.
Disclosure of Invention
The purpose of the invention is: the anti-freezing and anti-cracking concrete with high strength can effectively improve the anti-freezing capacity of the concrete in the condensation and hardening process under the condition of lower environmental temperature, and can be effectively sieved before the aggregate is mixed, so that the quality of the aggregate is improved, and the overall strength of the concrete is improved.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
the high-strength antifreezing and anti-cracking concrete comprises cement, aggregates, an additive, a powder admixture and fibers, wherein the aggregates comprise coarse aggregates and fine aggregates, the coarse aggregates are selected from broken stones or pebbles, the particle size of the coarse aggregates is 5-25mm, the fine aggregates are river sand, the fineness modulus of the fine aggregates is 2.2-1.6, the average particle size of the fine aggregates is 0.35-0.25mm, the additive comprises an air entraining agent and a water reducing agent, the powder admixture is selected from coal ash powder or silicon powder, and the fibers are selected from one or more of polypropylene fibers, nylon fibers, steel fibers and alkali-resistant glass fibers;
the preparation method of the high-strength antifreezing anti-cracking concrete further comprises the following steps:
s1: firstly, preparing the following materials in parts by weight: 297.5-340 parts of cement, 1200-1350 parts of coarse aggregate, 510-630 parts of fine aggregate, 150-210 parts of water, 13.5-28.4 parts of air-entraining agent, 10.8-29.7 parts of water reducing agent, 52.5-60 parts of powder admixture and 1-1.8 parts of fiber;
s2: adding 297.5-340 parts of cement and 52.5-60 parts of powder admixture into a stirring device for mixing to obtain a mixture of the cement and the powder admixture;
s3: adding 630 parts of 510-630 parts of fine aggregate into a stirring device to be mixed with the mixture to obtain the mixture of cement, powder admixture and fine aggregate;
s4: adding 1200-1350 parts of coarse aggregate and 1-1.8 parts of fiber into a stirring device to be mixed with the mixture to obtain the mixture of cement, powder admixture, fine aggregate, coarse aggregate and fiber;
s5: adding 150-240 parts of water slowly into the stirring equipment, and fully mixing the water with the mixture in the stirring equipment, wherein in the process of adding the water into the stirring equipment, the stirring equipment continuously rotates and stirs to ensure that the water and the mixture are fully mixed; stirring the apparatus during mixing to
S6: and adding 13.5-28.4 parts of air entraining agent and 10.8-29.7 parts of water reducing agent into stirring equipment, and ensuring that the stirring equipment continuously stirs for 10-35min at the rotating speed of 350-600 rpm, so that the air entraining agent, the water reducing agent, the water and the mixture are fully mixed, and the high-strength anti-freezing anti-cracking concrete is obtained.
By adopting the technical scheme of the invention, the air entraining agent is a surface active substance, when a certain amount of the air entraining agent is doped into concrete, the surface tension of mixing water in the concrete is obviously reduced, so that a large amount of small stable closed bubbles are generated in the concrete, and the bubbles have certain elasticity, so that when the concrete is frozen due to low ambient temperature in the process of setting and hardening, the expansion pressure generated by freezing can be effectively relieved, the effect of buffering and pressure reduction is further achieved, meanwhile, the bubbles can also block a passage between a capillary tube in the concrete and the outside, so that the outside moisture is not easy to enter, the permeability of the concrete is further reduced, the workability of the concrete can also be improved, the concrete is more favorable for being filled into a mould during construction, and the compactness of the concrete after hardening is improved, meanwhile, a large amount of air bubbles exist in the concrete, so that the concrete contains a certain air content, and the frost resistance and durability of the concrete are improved;
the water reducing agent can reduce the water amount needed when the concrete is mixed, so that the water-cement ratio of the concrete is greatly reduced, the cement particles are uniformly dispersed, the water contained in the cement particles can be discharged, the average size and the space of bubbles in the concrete are reduced, the water content in the concrete is reduced, the percentage of frozen water generated in the concrete is reduced, the strength and the compactness of the concrete are improved, and the frost resistance and the crack resistance of the concrete are effectively improved;
on one hand, the addition of the powder admixture can be matched with cement to be used as a gel material, so that the use ratio of the cement is reduced, the water content of the cement is reduced, the water-cement ratio of the concrete is further reduced, the frost resistance of the concrete is improved, and meanwhile, the particle size of the powder admixture is smaller, so that the porosity of the concrete after being mixed can be further reduced, and the freezing damage of the water to the concrete is further reduced;
the addition of the fibers can be uniformly and rapidly dispersed in the concrete along with the mixing of the concrete to form a disorderly support body system, so that the directional stress of the concrete is dispersed, the occurrence and development of primary cracks in the concrete are prevented, the number and the scale of the primary microcracks are eliminated or reduced, the anti-cracking and anti-permeability capability of the concrete is greatly improved, and the toughness of the concrete is improved, so that the service life of the concrete is prolonged;
the fineness modulus of the fine aggregate is 2.2-1.6, and the particle size of the coarse aggregate is 5-25mm, so that the void ratio after the concrete is mixed can be further reduced, and further the damage of the concrete when being frozen is further reduced.
Further limited, the air entraining agent is one or more of rosin soap, rosin thermopolymer, alkylbenzene sulfonate and fatty alcohol, and the water reducing agent is one or more of FDN water reducing agent, UNF water reducing agent, NF water reducing agent, HM water reducing agent and AF water reducing agent.
Further limiting, the stirring equipment comprises a stirring barrel and a stirring mechanism arranged in the stirring barrel, wherein a screening mechanism is arranged at the upper end of the stirring barrel, the screening mechanism comprises a screening ring fixedly connected with the stirring barrel, the minimum diameter of the screening ring is matched with the maximum diameter of the stirring barrel, a first annular groove and a second annular groove are sequentially arranged on the screening ring from inside to outside, the first annular groove is provided with a through groove connected with the stirring barrel, a toothed ring is rotationally assembled in the through groove, a first motor is arranged at the upper end of the stirring barrel, a transmission gear meshed with the toothed ring is fixedly connected with an output shaft of the first motor, the screening ring is provided with a protective shell matched with the toothed ring and the transmission gear, a plurality of bosses are uniformly arranged on the bottom wall of the first annular groove in an annular manner, a movable groove connected with the second annular groove is arranged on one side of the first annular groove far away from the through groove, the toothed ring is provided with, the extension ring is equipped with a plurality of and first annular assorted bounce mechanisms, bounce mechanism stretches out the activity groove and is connected with the annular sieve board that matches with the second annular, open the feed opening that has to be connected with the agitator under the second annular, the screening ring is equipped with a feed inlet of being connected with the second annular at least, the screening ring is equipped with the window of unloading of being connected with the second annular. The structure is characterized in that the stirring barrel is matched with the stirring mechanism to stir concrete, the screening mechanism screens materials added into the stirring barrel, impurities and overlarge aggregates are prevented from being added into the concrete, a first motor is started during screening, the materials to be screened are added into a second annular groove through a feeding hole, the first motor is started to drive a transmission gear to rotate at the moment, a toothed ring meshed with the transmission gear is driven to rotate, the annular sieve plate is driven to rotate through an extension ring and a plurality of bouncing mechanisms, the annular sieve plate is vibrated up and down in a reciprocating mode through the matching of the bouncing mechanisms and bosses, the materials on the annular sieve plate are vibrated and screened, the screened qualified materials are fed into the stirring barrel through a feeding hole, and meanwhile, the annular sieve plate continuously rotates along with the rotation of the toothed ring, so that the materials at the feeding hole can be rapidly taken away from the feeding hole after being put into the stirring barrel, and then avoid the material to block up the feed inlet and can realize continuing reinforced screening, compare in the screening mode of traditional plane sieve, can effectively improve screening efficiency, the window of unloading is used for discharging the unqualified material that is detained on annular sieve, and the protective housing can protect ring gear and drive gear.
Further inject, rabbling mechanism is including being located the stirring main shaft of agitator, stirring main shaft lower extreme rotates and runs through the first gear of agitator fixedly connected with, the agitator lower extreme is equipped with the second motor, the output shaft fixedly connected with of second motor and the corresponding second gear of first gear, be equipped with the transmission toothed belt between first gear and the second gear. With the structure, when the stirring processing is carried out, the second motor is started, the output shaft of the second motor rotates to drive the second gear to rotate, the second gear transmits power to the first gear through the transmission toothed belt, and then the stirring main shaft is driven to mix and stir materials in the stirring barrel.
Further inject, the mechanism of bouncing is including the telescopic link with extension ring sliding assembly, the telescopic link lower extreme is equipped with the gyro wheel, the telescopic link upper end is equipped with the L shape connecting rod that stretches out the activity groove, L shape connecting rod other end fixedly connected with keeps off the ring, the height dimension who keeps off the ring is greater than the height dimension in activity groove, keep off the ring and be connected with annular sieve. Such structure, when the ring gear rotates, the extension ring will drive a plurality of groups of bouncing mechanisms to move, the gyro wheel of bouncing mechanism rolls in first annular this moment, when the gyro wheel passes through the boss, will make the telescopic link of being connected with it lift from top to bottom, and then drive through L shape connecting rod and keep off ring and annular sieve board rebound, when the gyro wheel passes through the boss completely, because gravity makes annular sieve board rebound, like this along with rotate alright make annular sieve board realize reciprocal beating, also can carry out effectual screening to the material when conveying the material, keep off the ring and can avoid the material to get into in the first annular.
Further inject, the telescopic link cover is equipped with the spring that is located between gyro wheel and the extension ring. With the structure, the spring can actively push the telescopic rod downwards, so that the roller is ensured to be attached to the bottom wall of the first circular groove in a static state.
Further, the annular sieve plate inclines to the axis of the stirring barrel from bottom to top. Such structure for unqualified material can be concentrated, thereby is convenient for more discharge through the window of unloading.
Further inject, the agitator lower extreme evenly is equipped with four support post, four support post all is equipped with the slipmat. With the structure, the device can be supported more stably.
Further limiting, a material guide hopper is arranged at the position of the material inlet. By the structure, when filtering materials are added, the materials can enter the second ring groove more intensively.
Drawings
The invention is further illustrated by the non-limiting examples given in the accompanying drawings;
FIG. 1 is a schematic structural diagram I of an embodiment of a high-strength, frost-resistant and crack-resistant concrete of the present invention;
FIG. 2 is a schematic structural diagram II of an embodiment of the high-strength frost-resistant crack-resistant concrete of the present invention;
FIG. 3 is a cross-sectional view of the structure of an embodiment of a high strength, frost-resistant, crack-resistant concrete of the present invention;
FIG. 4 is an enlarged schematic view at A in FIG. 3;
FIG. 5 is a cross-sectional view of a screening ring structure of an embodiment of a high strength, frost and crack resistant concrete of the present invention;
the main element symbols are as follows:
the device comprises a stirring barrel 1, a support upright 11, a screening ring 2, a first ring groove 21, a toothed ring 22, a first motor 23, a transmission gear 24, a protective shell 25, a boss 26, a movable groove 27, an extension ring 28, a second ring groove 3, an annular screen plate 31, a feed opening 32, a feed inlet 33, a guide hopper 331, a discharge window 34, a stirring main shaft 4, a first gear 41, a second motor 42, a second gear 43, a transmission toothed belt 44, a telescopic rod 5, a roller 51, an L-shaped connecting rod 52, a baffle ring 53 and a spring 54.
Detailed Description
In order that those skilled in the art can better understand the present invention, the following technical solutions are further described with reference to the accompanying drawings and examples.
As shown in fig. 1 to 5, a high-strength frost-resistant crack-resistant concrete comprises cement, aggregates, an additive, a powder admixture and fibers, wherein the aggregates comprise coarse aggregates and fine aggregates, the coarse aggregates are selected from broken stones or pebbles, the particle size of the coarse aggregates is 5 to 25mm, the fine aggregates are river sand, the fineness modulus of the fine aggregates is 2.2 to 1.6, the average particle size of the fine aggregates is 0.35 to 0.25mm, the additive comprises an air entraining agent and a water reducing agent, the powder admixture is selected from coal ash powder or silica powder, and the fibers are selected from one or more of polypropylene fibers, nylon fibers, steel fibers and alkali-resistant glass fibers;
the preparation method of the high-strength antifreezing anti-cracking concrete further comprises the following steps:
s1: firstly, preparing the following materials in parts by weight: 297.5-340 parts of cement, 1200-1350 parts of coarse aggregate, 510-630 parts of fine aggregate, 150-210 parts of water, 13.5-28.4 parts of air-entraining agent, 10.8-29.7 parts of water reducing agent, 52.5-60 parts of powder admixture and 1-1.8 parts of fiber;
s2: adding 297.5-340 parts of cement and 52.5-60 parts of powder admixture into a stirring device for mixing to obtain a mixture of the cement and the powder admixture;
s3: adding 630 parts of 510-630 parts of fine aggregate into a stirring device to be mixed with the mixture to obtain the mixture of cement, powder admixture and fine aggregate;
s4: adding 1200-1350 parts of coarse aggregate and 1-1.8 parts of fiber into a stirring device to be mixed with the mixture to obtain the mixture of cement, powder admixture, fine aggregate, coarse aggregate and fiber;
s5: adding 150-240 parts of water slowly into the stirring equipment, and fully mixing the water with the mixture in the stirring equipment, wherein in the process of adding the water into the stirring equipment, the stirring equipment continuously rotates and stirs to ensure that the water and the mixture are fully mixed; stirring the apparatus during mixing to
S6: and adding 13.5-28.4 parts of air entraining agent and 10.8-29.7 parts of water reducing agent into stirring equipment, and ensuring that the stirring equipment continuously stirs for 10-35min at the rotating speed of 350-600 rpm, so that the air entraining agent, the water reducing agent, the water and the mixture are fully mixed, and the high-strength anti-freezing anti-cracking concrete is obtained.
By adopting the technical scheme of the invention, the air entraining agent is a surface active substance, when a certain amount of the air entraining agent is doped into concrete, the surface tension of mixing water in the concrete is obviously reduced, so that a large amount of small stable closed bubbles are generated in the concrete, and the bubbles have certain elasticity, so that when the concrete is frozen due to low ambient temperature in the process of setting and hardening, the expansion pressure generated by freezing can be effectively relieved, the effect of buffering and pressure reduction is further achieved, meanwhile, the bubbles can also block a passage between a capillary tube in the concrete and the outside, so that the outside moisture is not easy to enter, the permeability of the concrete is further reduced, the workability of the concrete can also be improved, the concrete is more favorable for being filled into a mould during construction, and the compactness of the concrete after hardening is improved, meanwhile, a large amount of air bubbles exist in the concrete, so that the concrete contains a certain air content, and the frost resistance and durability of the concrete are improved;
the water reducing agent can reduce the water amount needed when the concrete is mixed, so that the water-cement ratio of the concrete is greatly reduced, the cement particles are uniformly dispersed, the water contained in the cement particles can be discharged, the average size and the space of bubbles in the concrete are reduced, the water content in the concrete is reduced, the percentage of frozen water generated in the concrete is reduced, the strength and the compactness of the concrete are improved, and the frost resistance and the crack resistance of the concrete are effectively improved;
on one hand, the addition of the powder admixture can be matched with cement to be used as a gel material, so that the use ratio of the cement is reduced, the water content of the cement is reduced, the water-cement ratio of the concrete is further reduced, the frost resistance of the concrete is improved, and meanwhile, the particle size of the powder admixture is smaller, so that the porosity of the concrete after being mixed can be further reduced, and the freezing damage of the water to the concrete is further reduced;
the addition of the fibers can be uniformly and rapidly dispersed in the concrete along with the mixing of the concrete to form a disorderly support body system, so that the directional stress of the concrete is dispersed, the occurrence and development of primary cracks in the concrete are prevented, the number and the scale of the primary microcracks are eliminated or reduced, the anti-cracking and anti-permeability capability of the concrete is greatly improved, and the toughness of the concrete is improved, so that the service life of the concrete is prolonged;
the fineness modulus of the fine aggregate is 2.2-1.6, and the particle size of the coarse aggregate is 5-25mm, so that the void ratio after the concrete is mixed can be further reduced, and further the damage of the concrete when being frozen is further reduced.
Preferably, the air entraining agent is one or more of rosin soap, rosin thermopolymer, alkylbenzene sulfonate and fatty alcohol, and the water reducing agent is one or more of FDN water reducing agent, UNF water reducing agent, NF water reducing agent, HM water reducing agent and AF water reducing agent.
Preferably, the stirring equipment comprises a stirring barrel 1 and a stirring mechanism arranged in the stirring barrel 1, the upper end of the stirring barrel 1 is provided with a screening mechanism, the screening mechanism comprises a screening ring 2 fixedly connected with the stirring barrel 1, the minimum diameter of the screening ring 2 is matched with the maximum diameter of the stirring barrel 1, the screening ring 2 is sequentially provided with a first ring groove 21 and a second ring groove 3 from inside to outside, the first ring groove 21 is provided with a through groove connected with the stirring barrel 1, a toothed ring 22 is rotationally assembled in the through groove, the upper end of the stirring barrel 1 is provided with a first motor 23, an output shaft of the first motor 23 is fixedly connected with a transmission gear 24 meshed with the toothed ring 22, the screening ring 2 is provided with a protective shell 25 matched with the toothed ring 22 and the transmission gear 24, a plurality of bosses 26 are uniformly arranged on the annular bottom wall of the first ring groove 21, a movable groove 27 connected with the second ring groove 3 is arranged on the side of the first ring groove 21 away from the through groove, the, the extension ring 28 is provided with a plurality of bouncing mechanisms matched with the first ring groove 21, the bouncing mechanisms extend out of the movable groove 27 and are connected with an annular sieve plate 31 matched with the second ring groove 3, a feed opening 32 connected with the stirring barrel 1 is formed in the lower side of the second ring groove 3, the screening ring 2 is at least provided with a feed opening 33 connected with the second ring groove 3, and the screening ring 2 is provided with a discharge window 34 connected with the second ring groove 3. With the structure, the stirring barrel 1 is matched with the stirring mechanism to stir concrete, the screening mechanism screens materials added into the stirring barrel, impurities and overlarge aggregates are prevented from being added into the concrete, the first motor 23 is started during screening, the materials to be screened are added into the second annular groove 3 through the feed inlet 33, the first motor 23 is started to drive the transmission gear 24 to rotate, the toothed ring 22 meshed with the transmission gear is driven to rotate, the annular sieve plate 31 is driven to rotate through the extension ring 28 and the plurality of bouncing mechanisms, the annular sieve plate 31 is vibrated up and down through the matching of the bouncing mechanisms and the bosses 26, the materials on the annular sieve plate 31 are vibrated and screened, the qualified materials to be screened are fed into the stirring barrel 1 through the feed outlet, meanwhile, the annular sieve plate 31 continuously rotates along with the rotation of the toothed ring 22, and the materials at the feed inlet 33 are rapidly separated from the feed inlet 33 after being fed, and then avoid the material to block up feed inlet 33 and can realize continuing reinforced screening, compare in the screening mode of traditional plane sieve, can effectively improve screening efficiency, the window 34 of unloading is used for the unqualified material of discharge delay on annular sieve 31, and the protective housing 25 can protect ring gear 22 and drive gear 24. In fact, other structures can be considered according to specific situations, and the materials can be screened more effectively.
Preferably, the stirring mechanism includes a stirring main shaft 4 located in the stirring barrel 1, a first gear 41 is fixedly connected to the lower end of the stirring main shaft 4 to rotate and penetrate through the stirring barrel 1, a second motor 42 is arranged at the lower end of the stirring barrel 1, a second gear 43 corresponding to the first gear 41 is fixedly connected to an output shaft of the second motor 42, and a transmission toothed belt 44 is arranged between the first gear 41 and the second gear 43. With the structure, when the stirring processing is performed, the second motor 42 is started, at this time, the output shaft of the second motor 42 rotates to drive the second gear 43 to rotate, the second gear 43 transmits power to the first gear through the transmission toothed belt 44, and then the stirring main shaft 4 is driven to mix and stir the materials in the stirring barrel 1. In fact, other configurations may be used according to specific situations, so that the stirring spindle 4 can be driven more conveniently and effectively to perform the stirring process.
Preferably, the bouncing mechanism comprises a telescopic rod 5 assembled with the extension ring 28 in a sliding manner, a roller 51 is arranged at the lower end of the telescopic rod 5, an L-shaped connecting rod 52 extending out of the movable groove 27 is arranged at the upper end of the telescopic rod 5, a blocking ring 53 is fixedly connected to the other end of the L-shaped connecting rod 52, the height of the blocking ring 53 is larger than that of the movable groove 27, and the blocking ring 53 is connected with the annular sieve plate 31. Such structure, when the ring gear 22 rotates, extension ring 28 will drive a plurality of groups of bouncing mechanisms to move, roller 51 of bouncing mechanisms rolls in first annular groove 21 at this moment, when roller 51 passes through boss 26, will make telescopic link 5 connected with it lift up and down, and then drive through L-shaped connecting rod 52 and keep off ring 53 and annular sieve board 31 and upwards beat, when roller 51 passes through boss 26 completely, because gravity makes annular sieve board 31 move down, like this along with rotating alright make annular sieve board 31 realize reciprocating bouncing, also can carry out effectual screening to the material when conveying the material, keep off ring 53 and can avoid the material to get into in first annular groove 21. In fact, other structures can be considered according to specific situations, and the annular sieve plate 31 can be more effectively subjected to reciprocating jumping.
Preferably, the telescopic rod 5 is sheathed with a spring 54 located between the roller 51 and the extension ring 28. With such a structure, the spring 54 can actively push the telescopic rod 5 downwards, so as to ensure that the roller 51 is attached to the bottom wall of the first annular groove 21 in a static state. In fact, other structures can be considered according to specific situations, and the roller 51 can be more effectively ensured to be attached to the bottom wall of the first ring groove 21.
Preferably, the annular sieve plate 31 is inclined from bottom to top towards the axis of the mixing tank 1. Such a configuration enables off-spec material to be collected for easier discharge through the discharge window 34. In fact, other structures can be considered according to specific situations, and discharge of unqualified materials can be facilitated.
Preferably, the lower end of the stirring barrel 1 is uniformly provided with four supporting upright posts 11, and the four supporting upright posts 11 are provided with non-slip mats. With the structure, the device can be supported more stably. In fact, other structures can be used according to specific conditions, so that the device can be more stably supported.
Preferably, a material guiding funnel 331 is disposed at the feeding hole 33. With the structure, when the filter material is added, the material can enter the second annular groove 3 more intensively. In fact, other structures can be considered according to specific situations, so that the materials can enter the second annular groove 3 more intensively.
The foregoing embodiments are merely illustrative of the principles of the present invention and its efficacy, and are not to be construed as limiting the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. The utility model provides a frost-resistant anti-cracking concrete of high strength which characterized in that: the cement mortar comprises cement, aggregates, an additive, a powder admixture and fibers, wherein the aggregates comprise coarse aggregates and fine aggregates, the coarse aggregates are selected from broken stones or pebbles, the particle size of the coarse aggregates is 5-25mm, the fine aggregates are river sand, the fineness modulus of the fine aggregates is 2.2-1.6, the average particle size of the fine aggregates is 0.35-0.25mm, the additive comprises an air entraining agent and a water reducing agent, the powder admixture is selected from coal ash powder or silica powder, and the fibers are selected from one or more of polypropylene fibers, nylon fibers, steel fibers and alkali-resistant glass fibers;
the preparation method of the high-strength antifreezing anti-cracking concrete further comprises the following steps:
s1: firstly, preparing the following materials in parts by weight: 297.5-340 parts of cement, 1200-1350 parts of coarse aggregate, 510-630 parts of fine aggregate, 150-210 parts of water, 13.5-28.4 parts of air-entraining agent, 10.8-29.7 parts of water reducing agent, 52.5-60 parts of powder admixture and 1-1.8 parts of fiber;
s2: adding 297.5-340 parts of cement and 52.5-60 parts of powder admixture into a stirring device for mixing to obtain a mixture of the cement and the powder admixture;
s3: adding 630 parts of 510-630 parts of fine aggregate into a stirring device to be mixed with the mixture to obtain the mixture of cement, powder admixture and fine aggregate;
s4: adding 1200-1350 parts of coarse aggregate and 1-1.8 parts of fiber into a stirring device to be mixed with the mixture to obtain the mixture of cement, powder admixture, fine aggregate, coarse aggregate and fiber;
s5: adding 150-240 parts of water slowly into the stirring equipment, and fully mixing the water with the mixture in the stirring equipment, wherein in the process of adding the water into the stirring equipment, the stirring equipment continuously rotates and stirs to ensure that the water and the mixture are fully mixed; stirring the apparatus during mixing to
S6: and adding 13.5-28.4 parts of air entraining agent and 10.8-29.7 parts of water reducing agent into stirring equipment, and ensuring that the stirring equipment continuously stirs for 10-35min at the rotating speed of 350-600 rpm, so that the air entraining agent, the water reducing agent, the water and the mixture are fully mixed, and the high-strength anti-freezing anti-cracking concrete is obtained.
2. The high strength frost-resistant crack-resistant concrete according to claim 1, wherein: the air entraining agent is one or more of rosin soap, rosin thermopolymer, alkylbenzene sulfonate and fatty alcohol, and the water reducing agent is one or more of FDN water reducing agent, UNF water reducing agent, NF water reducing agent, HM water reducing agent and AF water reducing agent.
3. The high strength frost-resistant crack-resistant concrete according to claim 1, wherein: the stirring equipment comprises a stirring barrel (1) and a stirring mechanism arranged in the stirring barrel (1), wherein a screening mechanism is arranged at the upper end of the stirring barrel (1), the screening mechanism comprises a screening ring (2) fixedly connected with the stirring barrel (1), the minimum diameter of the screening ring (2) is matched with the maximum diameter of the stirring barrel (1), the screening ring (2) is sequentially provided with a first annular groove (21) and a second annular groove (3) from inside to outside, the first annular groove (21) is provided with a through groove connected with the stirring barrel (1), the through groove is provided with an inner rotating toothed ring (22), the upper end of the stirring barrel (1) is provided with a first motor (23), an output shaft of the first motor (23) is fixedly connected with a transmission gear (24) meshed with the toothed ring (22), the screening ring (2) is provided with a protective shell (25) matched with the toothed ring (22) and the transmission gear (24), first annular (21) diapire annular evenly is equipped with a plurality of bosss (26), first annular (21) are kept away from logical groove one side and are opened movable groove (27) of being connected with second annular (3), ring gear (22) are equipped with extension ring (28), extension ring (28) are equipped with a plurality of and first annular (21) assorted bounce mechanisms, bounce mechanism stretches out movable groove (27) and is connected with and second annular (3) assorted ring screen board (31), second annular (3) downside is opened has feed opening (32) of being connected with agitator (1), screening ring (2) are equipped with feed inlet (33) of being connected with second annular (3) at least, screening ring (2) are equipped with the window of unloading (34) of being connected with second annular (3).
4. The high strength frost-resistant crack-resistant concrete according to claim 3, wherein: the stirring mechanism is including stirring main shaft (4) that is located agitator (1), stirring main shaft (4) lower extreme rotates and runs through first gear (41) of agitator (1) fixedly connected with, agitator (1) lower extreme is equipped with second motor (42), the output shaft fixedly connected with of second motor (42) and first gear (41) corresponding second gear (43), be equipped with between first gear (41) and second gear (43) drive tooth area (44).
5. The high strength frost-resistant crack-resistant concrete according to claim 3, wherein: the bouncing mechanism comprises a telescopic rod (5) which is assembled with an extension ring (28) in a sliding mode, wherein rollers (51) are arranged at the lower end of the telescopic rod (5), an L-shaped connecting rod (52) extending out of a movable groove (27) is arranged at the upper end of the telescopic rod (5), a blocking ring (53) is fixedly connected to the other end of the L-shaped connecting rod (52), the height dimension of the blocking ring (53) is larger than that of the movable groove (27), and the blocking ring (53) is connected with an annular sieve plate (31).
6. The high strength frost-resistant crack-resistant concrete according to claim 5, wherein: the telescopic rod (5) is sleeved with a spring (54) between the roller (51) and the extension ring (28).
7. The high strength frost-resistant crack-resistant concrete according to claim 3, wherein: the annular sieve plate (31) inclines to the axis of the stirring barrel (1) from bottom to top.
8. The high strength frost-resistant crack-resistant concrete according to claim 3, wherein: four supporting columns (11) are evenly arranged at the lower end of the stirring barrel (1), and anti-slip pads are arranged on the four supporting columns (11).
9. The high strength frost-resistant crack-resistant concrete according to claim 3, wherein: a material guide hopper (331) is arranged at the position of the feeding hole (33).
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| CN114605119A (en) * | 2022-03-22 | 2022-06-10 | 深圳市东大洋建材有限公司 | Anti-freezing and anti-cracking concrete |
| CN115284470A (en) * | 2022-08-31 | 2022-11-04 | 安徽华塑股份有限公司 | Dispersing agent quantitative adding device for PVC resin production |
| CN116332589A (en) * | 2023-02-06 | 2023-06-27 | 中铁十五局集团有限公司 | A kind of environment-friendly low-temperature resistant crack-resistant concrete and preparation method thereof |
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| CN108654458A (en) * | 2018-06-12 | 2018-10-16 | 安徽方程式工业设计服务有限公司 | It is a kind of with screening function and be convenient for clean feed stuff agitating device |
| CN110105022A (en) * | 2019-05-30 | 2019-08-09 | 东北农业大学 | A kind of high-strength and super-freezing dry concrete material and preparation method thereof |
| CN111112057A (en) * | 2019-12-30 | 2020-05-08 | 苏肇松 | Screening sand device for construction |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108654458A (en) * | 2018-06-12 | 2018-10-16 | 安徽方程式工业设计服务有限公司 | It is a kind of with screening function and be convenient for clean feed stuff agitating device |
| CN110105022A (en) * | 2019-05-30 | 2019-08-09 | 东北农业大学 | A kind of high-strength and super-freezing dry concrete material and preparation method thereof |
| CN111112057A (en) * | 2019-12-30 | 2020-05-08 | 苏肇松 | Screening sand device for construction |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114605119A (en) * | 2022-03-22 | 2022-06-10 | 深圳市东大洋建材有限公司 | Anti-freezing and anti-cracking concrete |
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| CN116332589A (en) * | 2023-02-06 | 2023-06-27 | 中铁十五局集团有限公司 | A kind of environment-friendly low-temperature resistant crack-resistant concrete and preparation method thereof |
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| CN112897943B (en) | 2023-01-17 |
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