CN113788655A - Anti-freezing and anti-cracking concrete and preparation method thereof - Google Patents
Anti-freezing and anti-cracking concrete and preparation method thereof Download PDFInfo
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- CN113788655A CN113788655A CN202111087474.0A CN202111087474A CN113788655A CN 113788655 A CN113788655 A CN 113788655A CN 202111087474 A CN202111087474 A CN 202111087474A CN 113788655 A CN113788655 A CN 113788655A
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/06—Quartz; Sand
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/0048—Fibrous materials
- C04B20/0068—Composite fibres, e.g. fibres with a core and sheath of different material
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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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- 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
Abstract
The invention provides antifreeze and anti-cracking concrete and a preparation method thereof, and the antifreeze and anti-cracking concrete comprises a cementing material, aggregate, fly ash, a polycarboxylic acid water reducing agent, an antifreezing agent, mixing water, sepiolite-polylactic acid composite fiber and modified mesoporous silica, wherein the sepiolite-polylactic acid composite fiber consists of sepiolite fiber and polylactic acid fiber in a mass ratio of 1:0-0.3, and the fiber length is 10-100 mu m; the modified mesoporous silica is silane modified hydrophobic mesoporous silica, the pore diameter of the mesoporous silica is 5-30nm, optimized components are added in a targeted manner, a reinforced anti-freezing auxiliary material is prepared, the workability of concrete is effectively improved, the components are uniformly dispersed, the leveling effect is good, the air-entrapping effect is excellent, a large number of small bubbles are uniformly distributed in the structure, the air content is greater than 4.7%, the anti-freezing and anti-cracking performance is effectively improved, the comprehensive benefit is remarkably improved, and the modified mesoporous silica is popularized and applied.
Description
Technical Field
The invention relates to the technical field of concrete production, in particular to frost-resistant and crack-resistant concrete and a preparation method thereof.
Background
The concrete is artificial stone which is obtained by taking cement as a main gel material, uniformly mixing with water, sand, stones, chemical additives, admixtures and the like, forming and hardening, has the advantages of easiness in forming, low energy consumption and good durability, a large number of buildings need to be built along with the expansion of urban areas, and the concrete as a building material which is most widely applied in modern times also needs to be prepared and used in a large amount and needs to ensure that the concrete can be normally constructed and has enough strength after forming.
When the concrete is constructed in a low-temperature environment, free water in the concrete can be cooled and converted into a solid state from a liquid state, on one hand, the solid free water cannot participate in the hydration action of cement in the concrete, so that the strength of the concrete cannot be improved, on the other hand, the freezing solidification volume expansion of the water can also damage the concrete structure, therefore, the concrete generally needs to have good anti-freezing and anti-freezing capacities, namely, the concrete does not generate frost heaving damage before reaching the freezing critical strength after being poured, and has the capacity of resisting freeze-thaw cycles for a long time, therefore, when the temperature is lower in a cold area, in order to ensure the construction quality and the construction effect of the constructed concrete, the constructed concrete needs to have good anti-freezing capacity.
At present, a lot of concrete and a lot of concrete antifreezes are available, but most of the concrete cannot achieve ideal effects, some of the concrete cannot achieve obvious antifreezes due to the problems of components, and some of the concrete cannot be stored easily and used easily due to the complex components in the components.
Disclosure of Invention
In view of the above, the invention aims to provide a frost-resistant and crack-resistant concrete and a preparation method thereof, wherein optimized components are added in a targeted manner, a reinforced frost-resistant auxiliary material is prepared, the workability of the concrete is effectively improved, the components are uniformly dispersed, the leveling effect is good, the air-entrapping effect is excellent, a large number of small bubbles are uniformly distributed in the structure, the air content is more than 4.7%, the frost-resistant and crack-resistant performance is effectively improved, the comprehensive benefit is remarkably improved, and the frost-resistant and crack-resistant concrete is popularized and applied.
In order to achieve the purpose, the invention provides the following technical scheme:
the antifreeze anti-cracking concrete comprises a cementing material, aggregate, fly ash, a polycarboxylic acid water reducing agent, an antifreeze, mixing water, sepiolite-polylactic acid composite fiber and modified mesoporous silica, wherein the sepiolite-polylactic acid composite fiber consists of sepiolite fiber and polylactic acid fiber in a mass ratio of 1:0-0.3, and the fiber length is 10-100 mu m; the modified mesoporous silica is silane modified hydrophobic mesoporous silica, and the mesoporous aperture is 5-30 nm.
The invention is further preferably characterized in that the selected and matched parts by weight of the raw materials comprise 60-90 parts of cementing material, 380 parts of aggregate 200-380 parts, 30-70 parts of fly ash, 0.5-2 parts of polycarboxylic acid water reducing agent, 0-0.3 part of antifreezing agent, 25-50 parts of mixing water, 2-8 parts of sepiolite-polylactic acid composite fiber and 5-20 parts of modified mesoporous silica.
The invention is further preferably characterized in that the cementing material is ordinary portland cement, and the mass percentage of fine aggregate to coarse aggregate in the aggregate is 55-65: 35-45.
The modified mesoporous silica is further preferably prepared by taking polyacrylic acid and tetraethoxysilane as raw materials, adding polyacrylic acid and alkali liquor into a solvent, then adding tetraethoxysilane under the stirring condition, continuously stirring for 10-15h to prepare a silica solution, then adding nano magnesium oxide into the silica solution, carrying out 30KHz and 300W ultrasonic treatment for 10-60min, centrifuging and drying to obtain the mesoporous silica; heating the mesoporous silicon dioxide at 50-80 ℃ for 1-2h, heating to 350-450 ℃ for calcining for 2h, taking out the mesoporous silicon dioxide, stirring for 3-8h under acidic gas fog, washing for 2-4 times with clear water, drying, adding 2-3 times of modified solution into 24KHz and 300W for ultrasonic treatment for 5-10min, stirring for 8-15h, centrifuging, washing and drying to obtain the mesoporous silicon dioxide.
Further preferably, the alkali solution is ammonia water, the solvent is absolute ethyl alcohol or methanol, the acid gas fog is atomized tartaric acid water solution or atomized oxalic acid water solution, and the tartaric acid or oxalic acid content in the water solution is 5-7 wt%.
The invention further preferably selects the dosage of the nano magnesium oxide as 3-8 wt% of the silicon dioxide solution and the acid gas fog input amount as 0.5-1L/h.
More preferably, the modification liquid is trimethylchlorosilane, methyltrimethoxysilane, n-hexane and methanol in a volume ratio of 1:1:1: 1.
As further optimization of the invention, the frost-resistant and crack-resistant concrete is prepared by the following steps:
1) taking materials according to the mass parts, blending the aggregate and the sepiolite-polylactic acid composite fiber, and uniformly stirring to obtain a first mixed material for later use; blending the fly ash and the modified mesoporous silica, and uniformly stirring to obtain a second mixed material for later use;
2) dividing the cementing material into two parts, respectively adding the first mixed material and the second mixed material into the corresponding part of the cementing material under the stirring condition, and stirring for 2-5min to obtain a third mixed material and a fourth mixed material for later use;
3) and alternately blending the third mixed material and the fourth mixed material, adding a polycarboxylic acid water reducing agent, an antifreezing agent and mixing water when the blending amount reaches 20 wt%, and keeping stirring for 2-5min after blending is finished.
As a further preference of the invention, the stirring is involved in the preparation process, the stirring rate being from 30 to 100 rpm.
As a further preferred mode of the present invention, the number of intermingling is at least 3.
The invention has the beneficial effects that: the invention adds optimized components in a targeted manner, prepares a reinforcing anti-freezing auxiliary material by self, effectively improves the workability of concrete, has uniformly dispersed components and good leveling effect, simultaneously has excellent air-entrapping effect, uniformly distributes a large amount of small bubbles in the structure, has the air content of more than 4.7 percent, effectively improves the anti-freezing and anti-cracking performance, obviously improves the comprehensive benefit, and is popularized and applied.
Sepiolite, polylactic acid composite fiber are prepared to this application pertinence, effectively improve structural strength on the one hand, form stable fibre connection structure, on the other hand has excellent dispersion, wettability, the mobility of thick liquids has been improved, polylactic acid is in mixing hydration in-process, with the inter-component reaction be connected, and release partial carbon dioxide, in the stirring process, the modified hydrophobicity mesoporous silica of cooperation, homodisperse is in each region, the homogeneity of structural air hole is improved greatly, and the air hole is little and dense, whole solidification equilibrium is high. The mesoporous silica has excellent reinforcing property and good anti-seepage effect, effectively ensures the anti-seepage and anti-freezing properties of a concrete structure by cooperating with the composite fiber, reduces the water absorption amount during molding, reduces the water contact property after molding, further improves the crack resistance of concrete, has high efficiency and high quality, obviously improves the comprehensive performance, has strong applicability, and is worthy of being popularized in a large range.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
Example 1:
the antifreezing and anti-cracking concrete comprises, by weight, 60 parts of a cementing material, 200 parts of aggregate, 70 parts of fly ash, 1 part of a polycarboxylic acid water reducing agent, 0.1 part of an antifreezing agent, 33 parts of mixing water, 5 parts of sepiolite-polylactic acid composite fiber and 20 parts of modified mesoporous silica.
Wherein the sepiolite-polylactic acid composite fiber consists of sepiolite fiber and polylactic acid fiber in a mass ratio of 1:0.5, and the fiber length is 10-100 mu m; the modified mesoporous silica is silane modified hydrophobic mesoporous silica, and the mesoporous aperture is 5-30 nm; the cementing material is selected from ordinary portland cement, such as PO42.5/PO52.5 and the like, and the mass percentage ratio of fine aggregate to coarse aggregate in the aggregate (conventional sandstone material) is 60: 40.
Further, polyacrylic acid and tetraethoxysilane are taken as raw materials of the modified mesoporous silica, polyacrylic acid and ammonia water are added into absolute ethyl alcohol or methanol, tetraethoxysilane is added under the stirring condition, stirring is continuously carried out for 15 hours, a silica solution is prepared, then nano magnesium oxide with the mass of 6.2 wt% of that of the silica solution is added, ultrasonic treatment is carried out at 30KHz and 300W for 0min, and the mesoporous silica is obtained after centrifugation and drying; heating mesoporous silica at 30 ℃ for 0h, heating to 400 ℃ for calcining for 2h, taking out, stirring for 8h under acidic aerosol, washing with clear water for 2-4 times, drying, adding 3 times of modification solution, performing 24KHz and 300W ultrasonic treatment for 10min, stirring for 10h, centrifuging, washing, and drying to obtain the mesoporous silica.
Wherein the acid gas mist is atomized tartaric acid aqueous solution, the tartaric acid content in the aqueous solution is 5.8 wt%, and the introduction amount of the acid gas mist is 0.6L/h; the modifying liquid is trimethyl chlorosilane, methyl trimethoxy silane, normal hexane and methanol in the volume ratio of 1:1:1: 1.
Based on the raw material selection, the preparation method of the antifreeze anti-cracking concrete comprises the following steps:
1) taking materials according to the mass parts, blending the aggregate and the sepiolite-polylactic acid composite fiber, and uniformly stirring at 100rpm to obtain a first mixed material for later use; blending the fly ash and the modified mesoporous silica, and uniformly stirring at 100rpm to obtain a second mixed material for later use;
2) dividing the cementing material into two parts, respectively adding the first mixed material and the second mixed material into the corresponding part of the cementing material under the stirring condition of 45rpm, and continuously stirring for 2-5min to obtain a third mixed material and a fourth mixed material for later use;
3) and (3) alternately blending and blending the third mixed material and the fourth mixed material (4 times in the embodiment, namely dividing 2 parts of the third mixed material and the fourth mixed material respectively, alternately blending the three mixed materials and the fourth mixed material, wherein the stirring speed is 40rpm when the three mixed materials and the fourth mixed material are blended with each other), adding the polycarboxylic acid water reducer, the antifreezing agent and the mixing water into the mixture when the blending amount reaches 20 wt% (changing the stirring speed to 60rpm), and after the blending is finished, keeping the 80rpm and stirring for 2-5min to obtain the polycarboxylic acid water reducer.
Example 2:
the antifreezing and anti-cracking concrete comprises 75 parts by weight of cementing material, 320 parts by weight of aggregate, 50 parts by weight of fly ash, 1.3 parts by weight of polycarboxylic acid water reducing agent, 0.2 part by weight of antifreezing agent, 38 parts by weight of blending water, 5 parts by weight of sepiolite-polylactic acid composite fiber and 16 parts by weight of modified mesoporous silica.
Wherein the sepiolite-polylactic acid composite fiber consists of sepiolite fiber and polylactic acid fiber in a mass ratio of 1:0.5, and the fiber length is 10-100 mu m; the modified mesoporous silica is silane modified hydrophobic mesoporous silica, and the mesoporous aperture is 5-30 nm; the cementing material is selected from ordinary portland cement, such as PO42.5/PO52.5 and the like, and the mass percentage ratio of fine aggregate to coarse aggregate in the aggregate (conventional sandstone material) is 60: 40.
Further, polyacrylic acid and tetraethoxysilane are taken as raw materials of the modified mesoporous silica, polyacrylic acid and ammonia water are added into absolute ethyl alcohol or methanol, tetraethoxysilane is added under the stirring condition, stirring is continuously carried out for 15 hours, a silica solution is prepared, then nano magnesium oxide with the mass of 6.2 wt% of that of the silica solution is added, ultrasonic treatment is carried out at 30KHz and 300W for 0min, and the mesoporous silica is obtained after centrifugation and drying; heating mesoporous silica at 30 ℃ for 0h, heating to 400 ℃ for calcining for 2h, taking out, stirring for 8h under acidic aerosol, washing with clear water for 2-4 times, drying, adding 3 times of modification solution, performing 24KHz and 300W ultrasonic treatment for 10min, stirring for 10h, centrifuging, washing, and drying to obtain the mesoporous silica.
Wherein the acid gas mist is atomized tartaric acid aqueous solution, the tartaric acid content in the aqueous solution is 7 wt%, and the introduction amount of the acid gas mist is 1L/h; the modifying liquid is trimethyl chlorosilane, methyl trimethoxy silane, normal hexane and methanol in the volume ratio of 1:1:1: 1.
Based on the raw material selection, the preparation method of the antifreeze and crack resistant concrete is the same as that of the concrete in the embodiment 1.
Example 3:
the antifreezing and anti-cracking concrete comprises, by weight, 90 parts of a cementing material, 380 parts of aggregate, 65 parts of fly ash, 2 parts of a polycarboxylic acid water reducing agent, 0 part of an antifreezing agent, 45 parts of mixing water, 8 parts of sepiolite-polylactic acid composite fiber and 15 parts of modified mesoporous silica.
Wherein the sepiolite-polylactic acid composite fiber consists of sepiolite fiber and polylactic acid fiber in a mass ratio of 1:0.4, and the fiber length is 10-100 mu m; the modified mesoporous silica is silane modified hydrophobic mesoporous silica, and the mesoporous aperture is 5-30 nm; the cementing material is selected from ordinary portland cement, such as PO42.5/PO52.5 and the like, and the mass percentage ratio of fine aggregate to coarse aggregate in the aggregate (conventional sandstone material) is 60: 40.
Further, polyacrylic acid and tetraethoxysilane are taken as raw materials of the modified mesoporous silica, polyacrylic acid and ammonia water are added into absolute ethyl alcohol or methanol, tetraethoxysilane is added under the stirring condition, stirring is continuously carried out for 10 hours to prepare a silica solution, nano magnesium oxide with the mass of 4.7 wt% of that of the silica solution is added into the silica solution, ultrasonic treatment is carried out for 60 minutes at 30KHz and 300W, and the mesoporous silica is obtained after centrifugation and drying; heating mesoporous silica at 50 ℃ for 2h, heating to 450 ℃ for calcining for 2h, taking out, stirring for 5h under acidic aerosol, washing with clear water for 2-4 times, drying, adding 3 times of modification solution, performing 24KHz and 300W ultrasonic treatment for 50min, stirring for 15h, centrifuging, washing, and drying to obtain the mesoporous silica.
Wherein, the acid aerosol adopts atomized oxalic acid aqueous solution, the oxalic acid content in the aqueous solution is 6.0 wt%, and the introduction amount of the acid aerosol is 1L/h; the modifying liquid is trimethyl chlorosilane, methyl trimethoxy silane, normal hexane and methanol in the volume ratio of 1:1:1: 1.
Based on the raw material selection, the preparation method of the antifreeze anti-cracking concrete is the same as that of the example 1.
Example 4:
the antifreezing and anti-cracking concrete comprises, by weight, 60 parts of a cementing material, 200 parts of aggregate, 50 parts of fly ash, 0.5 part of a polycarboxylic acid water reducing agent, 0.3 part of an antifreezing agent, 38 parts of mixing water, 4 parts of sepiolite-polylactic acid composite fiber and 10 parts of modified mesoporous silica.
Wherein the sepiolite-polylactic acid composite fiber consists of sepiolite fiber and polylactic acid fiber in a mass ratio of 1:0.5, and the fiber length is 10-100 mu m; the modified mesoporous silica is silane modified hydrophobic mesoporous silica, and the mesoporous aperture is 5-30 nm; the cementing material is selected from ordinary portland cement, such as PO42.5/PO52.5 and the like, and the mass percentage ratio of fine aggregate to coarse aggregate in the aggregate (conventional sandstone material) is 65: 45.
Further, polyacrylic acid and tetraethoxysilane are taken as raw materials of the modified mesoporous silica, polyacrylic acid and ammonia water are added into absolute ethyl alcohol or methanol, tetraethoxysilane is added under the stirring condition, stirring is continuously carried out for 10 hours to prepare a silica solution, nano magnesium oxide with the mass of 4.7 wt% of that of the silica solution is added into the silica solution, ultrasonic treatment is carried out for 60 minutes at 30KHz and 300W, and the mesoporous silica is obtained after centrifugation and drying; heating mesoporous silica at 50 ℃ for 2h, heating to 450 ℃ for calcining for 2h, taking out, stirring for 5h under acidic aerosol, washing with clear water for 2-4 times, drying, adding 3 times of modification solution, performing 24KHz and 300W ultrasonic treatment for 50min, stirring for 15h, centrifuging, washing, and drying to obtain the mesoporous silica.
Wherein, the acid aerosol adopts atomized oxalic acid aqueous solution, the oxalic acid content in the aqueous solution is 5.5 wt%, and the introduction amount of the acid aerosol is 0.7L/h; the modifying liquid is trimethyl chlorosilane, methyl trimethoxy silane, normal hexane and methanol in the volume ratio of 1:1:1: 1.
Based on the raw material selection, the preparation method of the antifreeze anti-cracking concrete is the same as that of the example 1.
Example 5:
the antifreezing and anti-cracking concrete comprises, by weight, 65 parts of a cementing material, 240 parts of aggregate, 30 parts of fly ash, 0.8 part of a polycarboxylic acid water reducing agent, 0.1 part of an antifreezing agent, 30 parts of mixing water, 6 parts of sepiolite-polylactic acid composite fiber and 12 parts of modified mesoporous silica.
Wherein the sepiolite-polylactic acid composite fiber consists of sepiolite fiber and polylactic acid fiber in a mass ratio of 1:0.5, and the fiber length is 10-100 mu m; the modified mesoporous silica is silane modified hydrophobic mesoporous silica, and the mesoporous aperture is 5-30 nm; the cementing material is selected from ordinary portland cement, such as PO42.5/PO52.5 and the like, and the mass percentage ratio of fine aggregate to coarse aggregate in the aggregate (conventional sandstone material) is 60: 40.
Further, polyacrylic acid and tetraethoxysilane are taken as raw materials of the modified mesoporous silica, polyacrylic acid and ammonia water are added into absolute ethyl alcohol or methanol, tetraethoxysilane is added under the stirring condition, stirring is continuously carried out for 12 hours, a silica solution is prepared, then nano magnesium oxide which is 5.2 wt% of the mass of the silica solution is added into the silica solution, ultrasonic treatment is carried out for 40 minutes at 30KHz and 300W, and the mesoporous silica is obtained after centrifugation and drying; heating mesoporous silica at 60 ℃ for 1.5h, heating to 420 ℃ for calcining for 2h, taking out, stirring for 5h under acidic aerosol, washing with clear water for 2-4 times, drying, adding 3 times of modification solution, performing 24KHz and 300W ultrasonic treatment for 10min, stirring for 12h, centrifuging, washing, and drying to obtain the mesoporous silica.
Wherein the acid gas mist is atomized tartaric acid aqueous solution, the tartaric acid content in the aqueous solution is 6 wt%, and the introduction amount of the acid gas mist is 1L/h; the modifying liquid is trimethyl chlorosilane, methyl trimethoxy silane, normal hexane and methanol in the volume ratio of 1:1:1: 1.
Based on the raw material selection, the preparation method of the antifreeze anti-cracking concrete is the same as that of the example 1.
Comparative example 1:
concrete was prepared on the basis of example 1 by removing the sepiolite-polylactic acid composite fiber without changing other conditions.
Comparative example 2:
based on example 1, the modified mesoporous silica was removed and concrete was prepared under otherwise unchanged conditions.
Comparative example 3:
based on example 1, the concrete was prepared by removing the modified mesoporous silica and sepiolite-polylactic acid composite fiber without changing other conditions.
The concrete prepared in the above examples 1 to 5 and comparative examples 1 to 3 were subjected to performance tests, and the data are as follows:
it is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The frost-resistant and crack-resistant concrete is characterized in that: the composite fiber comprises a cementing material, aggregate, fly ash, a polycarboxylic acid water reducing agent, an antifreezing agent, mixing water, sepiolite-polylactic acid composite fiber and modified mesoporous silica, wherein the sepiolite-polylactic acid composite fiber consists of sepiolite fiber and polylactic acid fiber in a mass ratio of 1:0-0.3, and the fiber length is 10-100 mu m; the modified mesoporous silica is silane modified hydrophobic mesoporous silica, and the mesoporous aperture is 5-30 nm.
2. The frost resistant, crack resistant concrete of claim 1, wherein: the selected and matched parts by weight of the raw materials are 60-90 parts of cementing material, 380 parts of aggregate 200-containing material, 30-70 parts of fly ash, 0.5-2 parts of polycarboxylic acid water reducing agent, 0-0.3 part of anti-freezing agent, 25-50 parts of mixing water, 2-8 parts of sepiolite-polylactic acid composite fiber and 5-20 parts of modified mesoporous silicon dioxide.
3. The frost resistant, crack resistant concrete of claim 1, wherein: the cementing material is ordinary portland cement, and the mass percentage of fine aggregate and coarse aggregate in the aggregate is 55-65: 35-45.
4. The frost resistant, crack resistant concrete of claim 1, wherein: the modified mesoporous silica is prepared by taking polyacrylic acid and tetraethoxysilane as raw materials, adding polyacrylic acid and alkali liquor into a solvent, then adding tetraethoxysilane under the stirring condition, continuously stirring for 10-15h to prepare a silica solution, then adding nano magnesium oxide into the silica solution, carrying out ultrasonic treatment for 10-60min at 30KHz and 300W, centrifuging and drying to obtain the mesoporous silica; heating the mesoporous silicon dioxide at 50-80 ℃ for 1-2h, heating to 350-450 ℃ for calcining for 2h, taking out the mesoporous silicon dioxide, stirring for 3-8h under acidic gas fog, washing for 2-4 times with clear water, drying, adding 2-3 times of modified solution into 24KHz and 300W for ultrasonic treatment for 5-10min, stirring for 8-15h, centrifuging, washing and drying to obtain the mesoporous silicon dioxide.
5. The frost resistant, crack resistant concrete of claim 4, wherein: the alkali liquor is ammonia water, the solvent is absolute ethyl alcohol or methanol, the acid gas fog is atomized tartaric acid water solution or atomized oxalic acid water solution, and the tartaric acid or oxalic acid content in the water solution is 5-7 wt%.
6. The frost resistant, crack resistant concrete of claim 4, wherein: the dosage of the nano magnesium oxide is 3-8 wt% of the mass of the silicon dioxide solution, and the introduction amount of the acid aerosol is 0.5-1L/h.
7. The frost resistant, crack resistant concrete of claim 4, wherein: the modification liquid is trimethylchlorosilane, methyltrimethoxysilane, normal hexane and methanol in a volume ratio of 1:1:1: 1.
8. Anti-freeze anti-crack concrete according to any of claims 1 to 7, characterized in that it is prepared by:
1) taking materials according to the mass parts, blending the aggregate and the sepiolite-polylactic acid composite fiber, and uniformly stirring to obtain a first mixed material for later use; blending the fly ash and the modified mesoporous silica, and uniformly stirring to obtain a second mixed material for later use;
2) dividing the cementing material into two parts, respectively adding the first mixed material and the second mixed material into the corresponding part of the cementing material under the stirring condition, and stirring for 2-5min to obtain a third mixed material and a fourth mixed material for later use;
3) and alternately blending the third mixed material and the fourth mixed material, adding a polycarboxylic acid water reducing agent, an antifreezing agent and mixing water when the blending amount reaches 20 wt%, and keeping stirring for 2-5min after blending is finished.
9. The high-strength anti-cracking environment-friendly concrete according to claim 8, wherein: the stirring rate is 30-100 rpm.
10. The high-strength anti-cracking environment-friendly concrete according to claim 8, wherein: the intermingling times are at least 3 times.
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| JP2001213661A (en) * | 2000-01-31 | 2001-08-07 | Taiheiyo Cement Corp | Composite material |
| CN1810878A (en) * | 2006-01-16 | 2006-08-02 | 华东理工大学 | Prepn of fibrous composite nanometer clay/polylactic acid material |
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