CN115259887A - High-strength aerated renewable concrete - Google Patents
High-strength aerated renewable concrete Download PDFInfo
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- CN115259887A CN115259887A CN202210971147.XA CN202210971147A CN115259887A CN 115259887 A CN115259887 A CN 115259887A CN 202210971147 A CN202210971147 A CN 202210971147A CN 115259887 A CN115259887 A CN 115259887A
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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
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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
- C04B2111/40—Porous or lightweight 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
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Abstract
The application relates to high-strength aerated reproducible concrete, and relates to the technical field of concrete. The paint comprises the following components in parts by mass: 50-60 parts of cement; 70-90 parts of sandstone; 120-160 parts of recycled aggregate; 20-30 parts of water; 6-10 parts of a water reducing agent; 7-9 parts of a reinforcing auxiliary agent; 1.5-3.5 parts of a gas former; the reinforcing auxiliary agent comprises the following components in parts by mass: 4-5 parts of modified straw fiber; 3-4 parts of modified kaolin. According to the concrete reinforcing agent, the reinforcing agent is added into a concrete system, so that the mechanical strength of the concrete is improved, and the phenomenon that the concrete cracks or breaks at the subsequent stage can be effectively reduced.
Description
Technical Field
The application relates to the field of concrete, in particular to high-strength aerated reproducible concrete.
Background
The recycled concrete can also be called recycled aggregate concrete, the aerated concrete is porous silicate concrete, various physical mechanical properties of the aerated concrete depend on the autoclaved and cured concrete structure and comprise the pore structure and the pore wall, and the recycled concrete and the aerated concrete are combined to prepare the recycled aerated concrete, so that the environment-friendly and light concrete can be obtained.
Generally, the initiator is added into the concrete, so that the concrete contains a large number of air holes, the quality of the concrete is reduced, and the lightweight concrete is obtained.
In view of the above problems, the inventors thought that it was necessary to develop an aerated concrete having improved mechanical strength.
Disclosure of Invention
In order to promote the mechanical strength of the aerated recycled concrete, the application provides a high-strength aerated recycled concrete.
The application provides a high strength aerated reproducible concrete adopts following technical scheme:
the high-strength aerated reproducible concrete comprises the following components in parts by mass:
50-60 parts of cement, 70-90 parts of sandstone, 120-160 parts of recycled aggregate, 20-30 parts of water, 6-10 parts of water reducing agent, 7-9 parts of reinforcing additive and 1.5-3.5 parts of gas former;
the reinforcing auxiliary agent comprises the following components in parts by mass:
4-5 parts of modified straw fiber and 3-4 parts of modified kaolin.
The mechanical property of the recycled concrete can be improved by adding the reinforcing auxiliary agent into the recycled concrete, the reinforcing auxiliary agent is composed of modified straw fiber and modified kaolin, the modified straw fiber is a plant fiber with high cellulose content and good mechanical property, and after the modified straw fiber is combined with cement, the generation of calcium silicate hydrate by plant fiber pectin can be reduced, so that the mechanical strength of the concrete can be improved; the modified kaolin is added to improve the mechanical property and the durability of the concrete, the modified kaolin and the modified straw fibers can synergistically improve the mechanical property of the concrete, the modified kaolin has high activity and a microparticle filling effect, and can be uniformly dispersed in gaps on the surfaces of the modified straw fibers, so that the stability of the reinforcing auxiliary agent is improved, and the mechanical property of the whole concrete system is improved.
Preferably, the modified straw fiber comprises the following components: sodium hydroxide, sodium silicate and straw fiber.
The method comprises the steps of soaking and modifying straw fibers by sodium hydroxide, enabling the straw fibers to be in an alkaline environment, removing lignin and partial hemicellulose in the straw fibers, simultaneously removing a small amount of fatty substances and carbohydrates, and improving the roughness and porosity of the surfaces of the straw fibers, so that the compatibility between the modified straw fibers and a cement base material is improved, a large amount of hydrated particles are attached to holes in the surfaces of the straw fibers and a cement binding surface, the engaging force of a cement base is improved, so that the mechanical property of a concrete system is integrally improved, then modifying the straw fibers again by sodium silicate, reducing the water absorption rate, simultaneously reacting sodium silicate attached to the surfaces of the straw fibers with carbon dioxide in the air to generate silicic acid gel, drying and hardening, so that the internal structural compactness of the straw fibers is improved, the compactness and the corrosion resistance of the fiber surfaces are improved, and further the mechanical property of concrete is improved.
Preferably, the mass ratio of the sodium hydroxide to the sodium silicate to the straw fibers is (0.03-0.07) to (0.01-0.03) to 1.
The quality ratio of the sodium hydroxide, the sodium silicate and the straw fiber is controlled within the range, so that the performance of the straw fiber can be effectively improved.
Preferably, the modified straw fiber is prepared by the following method:
soaking the straw fibers in a sodium hydroxide aqueous solution with the mass concentration of 4% for 6-8h, then cleaning the straw fibers, drying to obtain primary straw fibers, mixing the primary straw fibers with a sodium silicate aqueous solution with the mass concentration of 1% to fully coat the primary straw fibers with the sodium silicate aqueous solution, and drying for 22-24h at the temperature of 75-85 ℃ to obtain the modified straw fibers.
Preferably, the modified kaolin comprises a polymeric blend, kaolin, maleic anhydride and an initiator.
The modified kaolin is obtained after the kaolin is combined with the polymer blend, has high activity and microparticle filling effect, and can be uniformly dispersed in gaps on the surface of the modified straw fiber, so that the pore structure of the straw fiber is improved, the working performance of concrete is optimized, and the interaction between the kaolin and the polymer blend is enhanced and the mechanical property is synergistically improved by introducing maleic anhydride and an initiator.
Preferably, the modified kaolin is prepared by the following method:
mixing the polymer blend and kaolin, drying for 22-24h at 45-55 ℃, mixing the dried polymer blend and kaolin, adding maleic anhydride and an initiator, continuously mixing, and cooling to obtain the modified kaolin.
Preferably, the mass ratio between the maleic anhydride and the initiator is (4.5-5.5): 1.
Controlling the mass ratio of maleic anhydride to initiator within the above range can improve the properties of kaolin.
Preferably, the polymeric blend comprises polycaprolactone and polylactic acid.
After the polycaprolactone and the polylactic acid are blended, the compatibility of the blend can be improved, and the overall toughness of the modified kaolin can be improved.
Preferably, the initiator is dibenzoyl peroxide.
The maleic anhydride and the dibenzoyl peroxide can jointly improve the dispersion uniformity of the kaolin, so that the stability of the modified kaolin is improved.
Preferably, the gas former is aluminum powder.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the reinforcing agent is added in the concrete system, the reinforcing agent is composed of modified straw fibers and modified kaolin, so that the mechanical property of the concrete system can be improved, the phenomena that the concrete cracks in the subsequent process and the like are reduced, the service life of the concrete is further prolonged, the modified straw fibers are plant fibers with high cellulose content and good mechanical property, and after the modified straw fibers are combined with cement, the generation of calcium silicate hydrate by plant fiber pectin can be reduced, so that the mechanical strength of the concrete can be improved; the modified kaolin has high activity and microparticle filling effect, and can be uniformly dispersed in gaps on the surface of the modified straw fiber, so that the stability of the reinforcing additive is improved, and the mechanical property of the whole concrete system is improved;
2. the modified straw fiber is composed of sodium hydroxide, sodium silicate and straw fiber, lignin is contained in the straw fiber, the straw fiber is alkaline after being combined with the sodium hydroxide, the lignin and hemicellulose on the surface of the straw fiber are removed, the rough weighing of the surface of the straw fiber is improved, the compatibility between the straw fiber and cement is improved, then the straw fiber is treated by the sodium silicate, the sodium silicate attached to the surface of the straw fiber reacts with carbon dioxide to generate silicic acid gel, and after the gel is dried and hardened, the tightness of the straw fiber can be improved, so that the overall stability of a concrete body system is improved;
3. the modified kaolin has high activity and microparticle filling effect, and can be uniformly dispersed in gaps on the surface of the modified straw fiber, so that the pore structure of the straw fiber is improved, the working performance of concrete is optimized, the interaction between the kaolin and the polymer blend is enhanced by introducing maleic anhydride and an initiator, and the mechanical property is synergistically improved.
Detailed Description
The embodiment of the application discloses high-strength aerated reproducible concrete, and the application is further described in detail by combining the embodiment.
Example 1
Preparing modified straw fiber:
soaking 3.78kg of straw fibers in 0.11kg of sodium hydroxide aqueous solution with the mass concentration of 4% for 8 hours, then cleaning the straw fibers by using clear water, putting the straw fibers into a drying oven, drying to obtain primary straw fibers, mixing the primary straw fibers with 0.11kg of sodium silicate aqueous solution with the mass concentration of 1% to ensure that the primary straw fibers are fully coated by the sodium silicate solution, and then drying for 24 hours in the environment of 75 ℃ to obtain the modified straw fibers.
Preparing modified kaolin:
uniformly stirring 1.5kg of polycaprolactone and 3.5kg of polylactic acid, adding into an internal mixer for melt blending, setting the rotation speed of the internal mixer at 60rpm/min, mixing at the temperature of 170 ℃ for 20min, and cooling to room temperature to obtain the polymer blend.
Mixing the prepared polymer blend with 0.2kg of kaolin, drying the mixture in an oven for 24 hours at the temperature of 45 ℃, then mixing the dried polymer blend and the kaolin for 5 minutes at the rotation speed of 60rpm/min at the temperature of 170 ℃, then adding 0.1kg of compatibilizer and 0.02kg of initiator, continuously mixing for 25 minutes, and cooling to obtain the modified kaolin.
Preparing an enhancer:
and fully stirring and mixing 4kg of the modified straw fiber obtained by the preparation and 3kg of modified kaolin to obtain the reinforcing agent.
Preparing recycled concrete:
50kg of cement and 7kg of reinforcing agent are fully stirred and mixed, 120kg of recycled aggregate is crushed, impurities are removed, the recycled aggregate after the impurities are removed is mixed with the cement, then 70kg of sandstone, 20kg of water, 6kg of water reducing agent and 1.5kg of gas generating agent are added, and the mixture is fully stirred uniformly, so that the recycled concrete can be obtained.
Example 2
Preparing modified straw fiber:
soaking 5.56kg of straw fiber in 0.39kg of sodium hydroxide aqueous solution with the mass concentration of 4% for 6h, then cleaning the straw fiber by using clear water, putting the straw fiber into a drying oven, drying to obtain primary straw fiber, mixing the primary straw fiber with 0.05kg of sodium silicate aqueous solution with the mass concentration of 1% to ensure that the primary straw fiber is fully coated by the sodium silicate solution, and then drying for 24h in the environment of 75 ℃ to obtain the modified straw fiber.
Preparing modified kaolin:
uniformly stirring 2.1kg of polycaprolactone and 4.9kg of polylactic acid, adding the mixture into an internal mixer for melt blending, setting the rotating speed of the internal mixer at 60rpm/min, mixing at the temperature of 170 ℃ for 20min, and cooling to room temperature to obtain the polymer blend.
Mixing the prepared polymer blend with 0.4kg of kaolin, drying in an oven for 22h at 55 ℃, then mixing the dried polymer blend with the kaolin for 5min at 170 ℃ and 60rpm/min, then adding 0.3kg of compatibilizer and 0.05kg of initiator, continuously mixing for 25min, and cooling to obtain the modified kaolin.
Preparing an enhancer:
and fully stirring and mixing 6kg of the prepared modified straw fiber and 4kg of modified kaolin to obtain the reinforcing agent.
Preparing recycled concrete:
the method comprises the steps of fully stirring and mixing 60kg of cement and 9kg of reinforcing agent, crushing 160kg of recycled aggregate, removing impurities, mixing the recycled aggregate after removing the impurities with the cement, then adding 90kg of sandstone, 30kg of water, 10kg of water reducing agent and 3.5kg of gas former, and fully and uniformly stirring to obtain the recycled concrete.
Example 3
Preparing modified straw fiber:
soaking 4.67kg of straw fiber in 0.23kg of sodium hydroxide aqueous solution with the mass concentration of 4% for 6h, then cleaning the straw fiber with clear water, putting the straw fiber into a drying oven, drying to obtain primary straw fiber, mixing the primary straw fiber with 0.1kg of sodium silicate aqueous solution with the mass concentration of 1% to ensure that the primary straw fiber is fully coated by the sodium silicate solution, and then drying for 24h in the environment of 75 ℃ to obtain the modified straw fiber.
Preparing modified kaolin:
1.8kg of polycaprolactone and 4.2kg of polylactic acid are uniformly stirred and then added into an internal mixer for melt blending, the internal mixer is set to be mixed for 20min at the temperature of 170 ℃ at the rotating speed of 60rpm/min, and the mixture is cooled to room temperature, so that the polymer blend is obtained.
Mixing the prepared polymer blend with 0.3kg of kaolin, drying in an oven for 23h at 50 ℃, then mixing the dried polymer blend with the kaolin at 170 ℃ and 60rpm/min for 5min, then adding 0.2kg of compatibilizer and 0.04kg of initiator, continuously mixing for 25min, and cooling to obtain the modified kaolin.
Preparing an enhancer:
and (3) fully stirring and mixing 5kg of the prepared modified straw fiber and 4kg of modified kaolin to obtain the reinforcing agent.
Preparing recycled concrete:
the method comprises the steps of fully stirring and mixing 55kg of cement and 8kg of reinforcing agent, crushing 140kg of recycled aggregate, removing impurities, mixing the recycled aggregate after removing the impurities with the cement, then adding 80kg of sandstone, 25kg of water, 80kg of water reducing agent and 2.5kg of gas former, and fully and uniformly stirring to obtain the recycled concrete.
Example 4
Example 4 based on example 3, example 4 differs from example 3 only in that: in example 4, when preparing modified straw fiber, the weight of straw fiber was 4.85kg, the weight of sodium hydroxide aqueous solution was 0.05kg, and the weight of sodium silicate aqueous solution was 0.1kg.
Example 5
Example 5 based on example 3, example 5 differs from example 3 only in that: in example 5, when preparing modified straw fiber, 4.46kg of straw fiber was weighed, 0.45kg of aqueous sodium hydroxide solution was weighed, and 0.09kg of aqueous sodium silicate solution was weighed.
Example 6
Example 6 based on example 3, example 6 differs from example 3 only in that: in example 6, when preparing modified straw fiber, the weight of straw fiber was 4.74kg, the weight of aqueous sodium hydroxide solution was 0.24kg, and the weight of aqueous sodium silicate solution was 0.02kg.
Example 7
Example 7 based on example 3, example 7 differs from example 3 only in that: in example 7, when preparing modified straw fiber, 4.42kg of straw fiber was weighed, 0.22kg of aqueous sodium hydroxide solution was weighed, and 0.36kg of aqueous sodium silicate solution was weighed.
Example 8
Example 8 on the basis of example 3, example 8 differs from example 3 only in that: in preparing the modified kaolin of example 8, 0.19kg of maleic anhydride was weighed and 0.05kg of dibenzoyl peroxide was weighed.
Example 9
Example 9 example 3 is referenced, and example 9 differs from example 3 only in that: in the preparation of modified kaolin as in example 8, 0.21 parts of maleic anhydride was weighed and 0.24kg of dibenzoyl peroxide was weighed.
Comparative example 1
The year of age ratio 1 is based on example 3, and the only difference between comparative example 1 and example 3 is that: comparative example 1 modified straw fiber was replaced with ordinary straw fiber.
Comparative example 2
Comparative example 2 is based on example 3, the only difference between comparative example 2 and example 3 being: comparative example 2 when preparing modified straw fiber, the weighed straw fiber was 4.76kg, the weighed aqueous sodium hydroxide solution was 0.24kg, and the weighed aqueous sodium silicate solution was 0kg.
Comparative example 3
Comparative example 3 based on example 3, comparative example 3 differs from example 3 only in that: comparative example 3 when preparing modified straw fiber, 4.9kg of straw fiber was weighed, 0kg of aqueous sodium hydroxide solution was weighed, and 0.1kg of aqueous sodium silicate solution was weighed.
Comparative example 4
Comparative example 4 is based on example 3, and comparative example 4 differs from example 3 only in that: comparative example 4 modified kaolin was prepared weighing 0.54kg kaolin, 0kg maleic anhydride and 0kg dibenzoyl peroxide.
Performance test
The recycled concrete obtained in examples 1 to 9 and comparative examples 1 to 3 was sampled and subjected to mechanical property test.
Selecting a GB/T50081-2002 common concrete mechanical property test method, obtaining a test piece with the thickness of 20cm multiplied by 5cm from the test sample, curing for 28 days, carrying out crack resistance test and tensile strength performance strength on the test piece, manufacturing three test pieces for each test piece, testing for 3 times, and filling the average value of the test results into table 1.
TABLE 1
Analysis of test data
As can be seen from Table 1, the compressive strength of the concrete prepared by the method of examples 1-3 after 28d of curing is more than 26MPa, the number of cracks is 6 or less, the maximum crack length is less than 10mm, and the tensile strength is more than 17MPa, so that the recycled concrete prepared by the method has good compressive performance and tensile strength, and the high-strength concrete prepared by the method has good mechanical strength.
As can be seen from table 1, the only difference between example 4 and example 3 is that: in the preparation of the modified straw fiber in example 3, 4.67kg of the straw fiber, 0.23kg of the sodium hydroxide aqueous solution and 0.1kg of the sodium silicate aqueous solution are weighed; in example 4, when the modified straw fiber is prepared, 4.85kg of the straw fiber, 0.05kg of the sodium hydroxide aqueous solution, 0.1kg of the sodium silicate aqueous solution are weighed, the compressive strength of example 4 is reduced, the number of cracks is increased, the maximum crack length is increased, and the tensile strength is reduced, which may be because the loss rate of the straw fiber is too low after the ratio of the sodium hydroxide is reduced, the retarding and coagulation inhibiting effects on cement are reduced, so that the cement rapid coagulation phenomenon occurs in the preparation process of the concrete, the stability of the concrete is reduced, the brittleness is increased, the compressive strength and the tensile strength are reduced, and the number of cracks and the maximum crack length are increased in the mechanical property detection test.
As can be seen from table 1, the only difference between example 5 and example 3 is that: when the modified straw fiber is prepared in example 5, 4.46kg of the straw fiber, 0.45kg of the sodium hydroxide aqueous solution and 0.9kg of the sodium silicate aqueous solution are weighed, the compressive strength of example 5 is reduced, the number of cracks is increased, the maximum crack length is increased, and the tensile strength is reduced, which is probably because the alkali concentration is too high after the ratio of the sodium hydroxide aqueous solution is increased, so that the swelling capacity of the alkali liquor in an amorphous area and a cellulose area is increased, the lateral connection inside the cellulose is weakened due to the breakage of a cellulose chain, the cellulose is loosened, the content and the strength of the cellulose are reduced, and the strength of the modified straw fiber is reduced, so that the mechanical property of a concrete system is reduced, and the mechanical property of example 5 is reduced.
As can be seen from table 1, example 6 differs from example 3 only in that: in example 6, when preparing the modified straw fiber, 4.74kg of the straw fiber, 0.24kg of the sodium hydroxide aqueous solution, and 0.02kg of the sodium silicate aqueous solution were weighed, and the compressive strength of example 6 was decreased, the number of cracks was increased, the maximum crack length was increased, and the tensile strength was decreased, because the percentage of the sodium silicate aqueous solution was decreased, the sodium silicate coated with the straw fiber was decreased, and it was difficult to coat all the straw fiber, the amount of the generated silica gel was also decreased, and the effect of increasing the internal structure tightness of the straw fiber was decreased, so the mechanical strength of the whole green concrete was decreased.
As can be seen from table 1, the only difference between example 7 and example 3 is that: in example 7, when the modified straw fiber is prepared, 4.42kg of the straw fiber, 0.22kg of the sodium hydroxide aqueous solution and 0.36kg of the sodium silicate aqueous solution are weighed, the compressive strength of example 7 is reduced, the number of cracks is increased, the maximum crack length is increased, and the tensile strength is reduced, because the sodium silicate coated on the surface of the straw fiber is increased after the ratio of the sodium silicate aqueous solution is too large, so that the uniformity of aggregation and bonding of the modified straw fiber is reduced, the stability of a concrete system is reduced, the mechanical strength of example 7 is reduced, and the crack resistance and the tensile strength are reduced.
As can be seen from table 1, the only difference between example 8 and example 3 is that: in the modified kaolin prepared in example 8, 0.19kg of maleic anhydride is weighed, 0.05kg of dibenzoyl peroxide is weighed, the compressive strength is reduced to some extent, the number of cracks is increased, the maximum crack length is increased, and the tensile strength is reduced to some extent, because the polycaprolactone is agglomerated after the addition amount of the maleic anhydride is reduced, the polycaprolactone is difficult to be uniformly dispersed in polylactic acid, and meanwhile, the kaolin is agglomerated, so that the dispersion state of the kaolin cannot be improved, the uniformity of a concrete system is reduced, the stability is difficult to be improved, and when a crack resistance detection test and a tensile property detection test are performed, the concrete system is easy to break and crack, so the mechanical property of example 8 is reduced.
As can be seen from table 1, example 9 differs from example 3 only in that: in the preparation of modified kaolin as in example 9, 0.21kg of maleic anhydride was weighed and 0.03kg of benzoyl peroxide was weighed. The compression strength was decreased, the number of cracks was increased, the maximum crack length was increased, and the tensile strength was decreased in example 9, because too much dibenzoyl peroxide induces chain scission of the polymer, which resulted in a decrease in the connection tightness between the polymers, and thus a decrease in the stability of the whole system, and thus the mechanical properties of the recycled concrete prepared in example 9 were decreased.
As can be seen from table 1, comparative example 1 differs from example 3 only in that: in the comparative example 1, the modified straw fiber is replaced by the common straw fiber, the compressive strength is reduced, the number of cracks is increased, the maximum crack length is increased, and the tensile strength is reduced in the comparative example 1, because the unmodified straw fiber has poor mechanical property with a cement bonding surface, the compatibility with a cement base material is reduced, and cement and the straw fiber are easy to separate, the compressive strength of the recycled concrete prepared in the comparative example 1 is reduced, the tensile strength is also reduced, and the mechanical property is reduced.
As can be seen from table 1, comparative example 2 differs from example 3 only in that: when the modified straw fiber is prepared in the comparative example 2, 4.76kg of the weighed straw fiber, 0.24kg of the weighed sodium hydroxide aqueous solution and 0kg of the weighed sodium silicate aqueous solution reduce the mechanical property of the comparative example 2, because the straw fiber is not modified by using the sodium silicate, the hardness of the straw fiber is reduced, the water absorption rate of the straw fiber is too high, the hydration effect of cement is reduced, the bonding strength between the straw fiber and a cement matrix is reduced, the compressive strength and the tensile strength of the comparative example 2 are reduced, and the mechanical property of the recycled concrete prepared in the comparative example 2 is reduced.
As can be seen from table 1, comparative example 3 differs from example 3 only in that: comparative example 3 when preparing modified straw fiber, the weighed straw fiber is 4.9kg, the weighed sodium hydroxide aqueous solution is 0kg, the weighed sodium silicate aqueous solution is 0.1kg, and the mechanical properties of the comparative example 3 are reduced because a large amount of cellulose and lignin are adhered to the surface of the straw fiber modified by sodium hydroxide, and the straw fiber has more fatty substances and carbohydrates, the roughness and porosity of the surface of the straw fiber are reduced, so the interface bonding effect with a cement-based material is reduced, the binding capacity is reduced, and the stability of the comparative example 3 is reduced, so the mechanical properties of the prepared recycled concrete are reduced.
As can be seen from table 1, comparative example 4 differs from example 4 only in that: comparative example 4 the kaolin weighed in the preparation of the modified kaolin was 0.54kg, the maleic anhydride weighed was 0kg, the dibenzoyl peroxide weighed was 0kg, and the tensile strength and compressive strength in comparative example 4 were both reduced, because the maleic amide and dibenzoyl peroxide were not used for improvement, the kaolin and polycaprolactone aggregated in the system, so that the kaolin and polycaprolactone dispersed in the system was poor, and the overall system stability was reduced, so the compressive strength and mechanical properties of the recycled concrete prepared in comparative example 4 were both reduced.
The present embodiment is merely illustrative and not restrictive, and various changes and modifications may be made by persons skilled in the art without departing from the scope of the present invention as defined in the appended claims. The technical scope of the present application is not limited to the contents of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. A high-strength aerated reproducible concrete is characterized in that: the paint comprises the following components in parts by mass:
50-60 parts of cement, 70-90 parts of sandstone, 120-160 parts of recycled aggregate, 20-30 parts of water, 6-10 parts of water reducing agent, 7-9 parts of reinforcing additive and 1.5-3.5 parts of gas former;
the reinforcing auxiliary agent comprises the following components in parts by mass:
4-5 parts of modified straw fiber and 3-4 parts of modified kaolin.
2. The high strength aerated renewable concrete of claim 1, wherein: the modified straw fiber comprises sodium hydroxide, sodium silicate and straw fiber.
3. The high strength aerated renewable concrete of claim 2, wherein: the mass ratio of the sodium hydroxide, the sodium silicate and the straw fiber is (0.03-0.07): (0.01-0.03): 1.
4. The high strength aerated renewable concrete of claim 2, wherein: the modified straw fiber is prepared by the following method:
soaking the straw fibers in a sodium hydroxide aqueous solution with the mass concentration of 4% for 6-8h, then cleaning the straw fibers, drying to obtain primary straw fibers, mixing the primary straw fibers with a sodium silicate aqueous solution with the mass concentration of 1% to fully coat the primary straw fibers with the sodium silicate aqueous solution, and drying for 22-24h at the temperature of 75-85 ℃ to obtain the modified straw fibers.
5. The high strength aerated renewable concrete of claim 1, wherein: the modified kaolin comprises a polymeric blend, kaolin, maleic anhydride, and an initiator.
6. The high strength aerated renewable concrete of claim 5, wherein: the modified kaolin is prepared by the following method:
mixing the polymer blend and kaolin, drying for 22-24h at 45-55 ℃, mixing the dried polymer blend and kaolin, adding maleic anhydride and an initiator, continuously mixing, and cooling to obtain the modified kaolin.
7. The high strength aerated renewable concrete of claim 5, wherein: the mass ratio of the maleic anhydride to the initiator is (4.5-5.5): 1.
8. The high strength aerated renewable concrete of claim 5, wherein: the polymeric blend includes polycaprolactone and polylactic acid.
9. The high strength aerated renewable concrete of claim 5, wherein: the initiator is dibenzoyl peroxide.
10. The high strength aerated renewable concrete of claim 1, wherein: the gas former is aluminum powder.
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